driver_nl80211.c

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/*
 * Driver interaction with Linux nl80211/cfg80211
 * Copyright (c) 2002-2010, Jouni Malinen <j@w1.fi>
 * Copyright (c) 2003-2004, Instant802 Networks, Inc.
 * Copyright (c) 2005-2006, Devicescape Software, Inc.
 * Copyright (c) 2007, Johannes Berg <johannes@sipsolutions.net>
 * Copyright (c) 2009-2010, Atheros Communications
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Alternatively, this software may be distributed under the terms of BSD
 * license.
 *
 * See README and COPYING for more details.
 */

#include "includes.h"
#include <sys/ioctl.h>
#include <net/if.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <netpacket/packet.h>
#include <linux/filter.h>
#include "nl80211_copy.h"

#include "common.h"
#include "eloop.h"
#include "common/ieee802_11_defs.h"
#include "netlink.h"
#include "linux_ioctl.h"
#include "radiotap.h"
#include "radiotap_iter.h"
#include "driver.h"

#ifdef CONFIG_LIBNL20
/* libnl 2.0 compatibility code */
#define nl_handle nl_sock
#define nl_handle_alloc_cb nl_socket_alloc_cb
#define nl_handle_destroy nl_socket_free
#endif /* CONFIG_LIBNL20 */


#ifndef IFF_LOWER_UP
#define IFF_LOWER_UP   0x10000         /* driver signals L1 up         */
#endif
#ifndef IFF_DORMANT
#define IFF_DORMANT    0x20000         /* driver signals dormant       */
#endif

#ifndef IF_OPER_DORMANT
#define IF_OPER_DORMANT 5
#endif
#ifndef IF_OPER_UP
#define IF_OPER_UP 6
#endif

struct i802_bss {
        struct wpa_driver_nl80211_data *drv;
        struct i802_bss *next;
        int ifindex;
        char ifname[IFNAMSIZ + 1];
        unsigned int beacon_set:1;
};

struct wpa_driver_nl80211_data {
        void *ctx;
        struct netlink_data *netlink;
        int ioctl_sock; /* socket for ioctl() use */
        char brname[IFNAMSIZ];
        int ifindex;
        int if_removed;
        struct wpa_driver_capa capa;
        int has_capability;

        int operstate;

        int scan_complete_events;

        struct nl_handle *nl_handle;
        struct nl_handle *nl_handle_event;
        struct nl_cache *nl_cache;
        struct nl_cache *nl_cache_event;
        struct nl_cb *nl_cb;
        struct genl_family *nl80211;

        u8 auth_bssid[ETH_ALEN];
        u8 bssid[ETH_ALEN];
        int associated;
        u8 ssid[32];
        size_t ssid_len;
        int nlmode;
        int ap_scan_as_station;
        unsigned int assoc_freq;

        int monitor_sock;
        int monitor_ifidx;
        int probe_req_report;
        int disable_11b_rates;

        unsigned int pending_remain_on_chan:1;
        unsigned int pending_send_action:1;
        unsigned int added_bridge:1;
        unsigned int added_if_into_bridge:1;

        u64 remain_on_chan_cookie;
        u64 send_action_cookie;

        struct wpa_driver_scan_filter *filter_ssids;
        size_t num_filter_ssids;

        struct i802_bss first_bss;

#ifdef HOSTAPD
        int eapol_sock; /* socket for EAPOL frames */

        int default_if_indices[16];
        int *if_indices;
        int num_if_indices;

        int last_freq;
        int last_freq_ht;
#endif /* HOSTAPD */
};


static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx,
                                            void *timeout_ctx);
static int wpa_driver_nl80211_set_mode(void *priv, int mode);
static int
wpa_driver_nl80211_finish_drv_init(struct wpa_driver_nl80211_data *drv);
static int wpa_driver_nl80211_mlme(struct wpa_driver_nl80211_data *drv,
                                   const u8 *addr, int cmd, u16 reason_code,
                                   int local_state_change);
static void nl80211_remove_monitor_interface(
        struct wpa_driver_nl80211_data *drv);

#ifdef HOSTAPD
static void add_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx);
static void del_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx);
static int have_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx);
static int wpa_driver_nl80211_if_remove(void *priv,
                                        enum wpa_driver_if_type type,
                                        const char *ifname);
#else /* HOSTAPD */
static int have_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx)
{
        return 0;
}
#endif /* HOSTAPD */

static int i802_set_freq(void *priv, struct hostapd_freq_params *freq);
static void wpa_driver_nl80211_probe_req_report_timeout(void *eloop_ctx,
                                                        void *timeout_ctx);
static int nl80211_disable_11b_rates(struct wpa_driver_nl80211_data *drv,
                                     int ifindex, int disabled);


/* nl80211 code */
static int ack_handler(struct nl_msg *msg, void *arg)
{
        int *err = arg;
        *err = 0;
        return NL_STOP;
}

static int finish_handler(struct nl_msg *msg, void *arg)
{
        int *ret = arg;
        *ret = 0;
        return NL_SKIP;
}

static int error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err,
                         void *arg)
{
        int *ret = arg;
        *ret = err->error;
        return NL_SKIP;
}


static int no_seq_check(struct nl_msg *msg, void *arg)
{
        return NL_OK;
}


static int send_and_recv(struct wpa_driver_nl80211_data *drv,
                         struct nl_handle *nl_handle, struct nl_msg *msg,
                         int (*valid_handler)(struct nl_msg *, void *),
                         void *valid_data)
{
        struct nl_cb *cb;
        int err = -ENOMEM;

        cb = nl_cb_clone(drv->nl_cb);
        if (!cb)
                goto out;

        err = nl_send_auto_complete(nl_handle, msg);
        if (err < 0)
                goto out;

        err = 1;

        nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
        nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
        nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);

        if (valid_handler)
                nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM,
                          valid_handler, valid_data);

        while (err > 0)
                nl_recvmsgs(nl_handle, cb);
 out:
        nl_cb_put(cb);
        nlmsg_free(msg);
        return err;
}


static int send_and_recv_msgs(struct wpa_driver_nl80211_data *drv,
                              struct nl_msg *msg,
                              int (*valid_handler)(struct nl_msg *, void *),
                              void *valid_data)
{
        return send_and_recv(drv, drv->nl_handle, msg, valid_handler,
                             valid_data);
}


struct family_data {
        const char *group;
        int id;
};


static int family_handler(struct nl_msg *msg, void *arg)
{
        struct family_data *res = arg;
        struct nlattr *tb[CTRL_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct nlattr *mcgrp;
        int i;

        nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);
        if (!tb[CTRL_ATTR_MCAST_GROUPS])
                return NL_SKIP;

        nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], i) {
                struct nlattr *tb2[CTRL_ATTR_MCAST_GRP_MAX + 1];
                nla_parse(tb2, CTRL_ATTR_MCAST_GRP_MAX, nla_data(mcgrp),
                          nla_len(mcgrp), NULL);
                if (!tb2[CTRL_ATTR_MCAST_GRP_NAME] ||
                    !tb2[CTRL_ATTR_MCAST_GRP_ID] ||
                    os_strncmp(nla_data(tb2[CTRL_ATTR_MCAST_GRP_NAME]),
                               res->group,
                               nla_len(tb2[CTRL_ATTR_MCAST_GRP_NAME])) != 0)
                        continue;
                res->id = nla_get_u32(tb2[CTRL_ATTR_MCAST_GRP_ID]);
                break;
        };

        return NL_SKIP;
}


static int nl_get_multicast_id(struct wpa_driver_nl80211_data *drv,
                               const char *family, const char *group)
{
        struct nl_msg *msg;
        int ret = -1;
        struct family_data res = { group, -ENOENT };

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;
        genlmsg_put(msg, 0, 0, genl_ctrl_resolve(drv->nl_handle, "nlctrl"),
                    0, 0, CTRL_CMD_GETFAMILY, 0);
        NLA_PUT_STRING(msg, CTRL_ATTR_FAMILY_NAME, family);

        ret = send_and_recv_msgs(drv, msg, family_handler, &res);
        msg = NULL;
        if (ret == 0)
                ret = res.id;

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int wpa_driver_nl80211_get_bssid(void *priv, u8 *bssid)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (!drv->associated)
                return -1;
        os_memcpy(bssid, drv->bssid, ETH_ALEN);
        return 0;
}


static int wpa_driver_nl80211_get_ssid(void *priv, u8 *ssid)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (!drv->associated)
                return -1;
        os_memcpy(ssid, drv->ssid, drv->ssid_len);
        return drv->ssid_len;
}


static void wpa_driver_nl80211_event_link(struct wpa_driver_nl80211_data *drv,
                                          char *buf, size_t len, int del)
{
        union wpa_event_data event;

        os_memset(&event, 0, sizeof(event));
        if (len > sizeof(event.interface_status.ifname))
                len = sizeof(event.interface_status.ifname) - 1;
        os_memcpy(event.interface_status.ifname, buf, len);
        event.interface_status.ievent = del ? EVENT_INTERFACE_REMOVED :
                EVENT_INTERFACE_ADDED;

        wpa_printf(MSG_DEBUG, "RTM_%sLINK, IFLA_IFNAME: Interface '%s' %s",
                   del ? "DEL" : "NEW",
                   event.interface_status.ifname,
                   del ? "removed" : "added");

        if (os_strcmp(drv->first_bss.ifname, event.interface_status.ifname) == 0) {
                if (del)
                        drv->if_removed = 1;
                else
                        drv->if_removed = 0;
        }

        wpa_supplicant_event(drv->ctx, EVENT_INTERFACE_STATUS, &event);
}


static int wpa_driver_nl80211_own_ifname(struct wpa_driver_nl80211_data *drv,
                                         u8 *buf, size_t len)
{
        int attrlen, rta_len;
        struct rtattr *attr;

        attrlen = len;
        attr = (struct rtattr *) buf;

        rta_len = RTA_ALIGN(sizeof(struct rtattr));
        while (RTA_OK(attr, attrlen)) {
                if (attr->rta_type == IFLA_IFNAME) {
                        if (os_strcmp(((char *) attr) + rta_len, drv->first_bss.ifname)
                            == 0)
                                return 1;
                        else
                                break;
                }
                attr = RTA_NEXT(attr, attrlen);
        }

        return 0;
}


static int wpa_driver_nl80211_own_ifindex(struct wpa_driver_nl80211_data *drv,
                                          int ifindex, u8 *buf, size_t len)
{
        if (drv->ifindex == ifindex)
                return 1;

        if (drv->if_removed && wpa_driver_nl80211_own_ifname(drv, buf, len)) {
                drv->first_bss.ifindex = if_nametoindex(drv->first_bss.ifname);
                wpa_printf(MSG_DEBUG, "nl80211: Update ifindex for a removed "
                           "interface");
                wpa_driver_nl80211_finish_drv_init(drv);
                return 1;
        }

        return 0;
}


static void wpa_driver_nl80211_event_rtm_newlink(void *ctx,
                                                 struct ifinfomsg *ifi,
                                                 u8 *buf, size_t len)
{
        struct wpa_driver_nl80211_data *drv = ctx;
        int attrlen, rta_len;
        struct rtattr *attr;
        u32 brid = 0;

        if (!wpa_driver_nl80211_own_ifindex(drv, ifi->ifi_index, buf, len) &&
            !have_ifidx(drv, ifi->ifi_index)) {
                wpa_printf(MSG_DEBUG, "nl80211: Ignore event for foreign "
                           "ifindex %d", ifi->ifi_index);
                return;
        }

        wpa_printf(MSG_DEBUG, "RTM_NEWLINK: operstate=%d ifi_flags=0x%x "
                   "(%s%s%s%s)",
                   drv->operstate, ifi->ifi_flags,
                   (ifi->ifi_flags & IFF_UP) ? "[UP]" : "",
                   (ifi->ifi_flags & IFF_RUNNING) ? "[RUNNING]" : "",
                   (ifi->ifi_flags & IFF_LOWER_UP) ? "[LOWER_UP]" : "",
                   (ifi->ifi_flags & IFF_DORMANT) ? "[DORMANT]" : "");
        /*
         * Some drivers send the association event before the operup event--in
         * this case, lifting operstate in wpa_driver_nl80211_set_operstate()
         * fails. This will hit us when wpa_supplicant does not need to do
         * IEEE 802.1X authentication
         */
        if (drv->operstate == 1 &&
            (ifi->ifi_flags & (IFF_LOWER_UP | IFF_DORMANT)) == IFF_LOWER_UP &&
            !(ifi->ifi_flags & IFF_RUNNING))
                netlink_send_oper_ifla(drv->netlink, drv->ifindex,
                                       -1, IF_OPER_UP);

        attrlen = len;
        attr = (struct rtattr *) buf;
        rta_len = RTA_ALIGN(sizeof(struct rtattr));
        while (RTA_OK(attr, attrlen)) {
                if (attr->rta_type == IFLA_IFNAME) {
                        wpa_driver_nl80211_event_link(
                                drv,
                                ((char *) attr) + rta_len,
                                attr->rta_len - rta_len, 0);
                } else if (attr->rta_type == IFLA_MASTER)
                        brid = nla_get_u32((struct nlattr *) attr);
                attr = RTA_NEXT(attr, attrlen);
        }

#ifdef HOSTAPD
        if (ifi->ifi_family == AF_BRIDGE && brid) {
                /* device has been added to bridge */
                char namebuf[IFNAMSIZ];
                if_indextoname(brid, namebuf);
                wpa_printf(MSG_DEBUG, "nl80211: Add ifindex %u for bridge %s",
                           brid, namebuf);
                add_ifidx(drv, brid);
        }
#endif /* HOSTAPD */
}


static void wpa_driver_nl80211_event_rtm_dellink(void *ctx,
                                                 struct ifinfomsg *ifi,
                                                 u8 *buf, size_t len)
{
        struct wpa_driver_nl80211_data *drv = ctx;
        int attrlen, rta_len;
        struct rtattr *attr;
        u32 brid = 0;

        attrlen = len;
        attr = (struct rtattr *) buf;

        rta_len = RTA_ALIGN(sizeof(struct rtattr));
        while (RTA_OK(attr, attrlen)) {
                if (attr->rta_type == IFLA_IFNAME) {
                        wpa_driver_nl80211_event_link(
                                drv,
                                ((char *) attr) + rta_len,
                                attr->rta_len - rta_len, 1);
                } else if (attr->rta_type == IFLA_MASTER)
                        brid = nla_get_u32((struct nlattr *) attr);
                attr = RTA_NEXT(attr, attrlen);
        }

#ifdef HOSTAPD
        if (ifi->ifi_family == AF_BRIDGE && brid) {
                /* device has been removed from bridge */
                char namebuf[IFNAMSIZ];
                if_indextoname(brid, namebuf);
                wpa_printf(MSG_DEBUG, "nl80211: Remove ifindex %u for bridge "
                           "%s", brid, namebuf);
                del_ifidx(drv, brid);
        }
#endif /* HOSTAPD */
}


static void mlme_event_auth(struct wpa_driver_nl80211_data *drv,
                            const u8 *frame, size_t len)
{
        const struct ieee80211_mgmt *mgmt;
        union wpa_event_data event;

        mgmt = (const struct ieee80211_mgmt *) frame;
        if (len < 24 + sizeof(mgmt->u.auth)) {
                wpa_printf(MSG_DEBUG, "nl80211: Too short association event "
                           "frame");
                return;
        }

        os_memcpy(drv->auth_bssid, mgmt->sa, ETH_ALEN);
        os_memset(&event, 0, sizeof(event));
        os_memcpy(event.auth.peer, mgmt->sa, ETH_ALEN);
        event.auth.auth_type = le_to_host16(mgmt->u.auth.auth_alg);
        event.auth.status_code = le_to_host16(mgmt->u.auth.status_code);
        if (len > 24 + sizeof(mgmt->u.auth)) {
                event.auth.ies = mgmt->u.auth.variable;
                event.auth.ies_len = len - 24 - sizeof(mgmt->u.auth);
        }

        wpa_supplicant_event(drv->ctx, EVENT_AUTH, &event);
}


static void mlme_event_assoc(struct wpa_driver_nl80211_data *drv,
                            const u8 *frame, size_t len)
{
        const struct ieee80211_mgmt *mgmt;
        union wpa_event_data event;
        u16 status;

        mgmt = (const struct ieee80211_mgmt *) frame;
        if (len < 24 + sizeof(mgmt->u.assoc_resp)) {
                wpa_printf(MSG_DEBUG, "nl80211: Too short association event "
                           "frame");
                return;
        }

        status = le_to_host16(mgmt->u.assoc_resp.status_code);
        if (status != WLAN_STATUS_SUCCESS) {
                os_memset(&event, 0, sizeof(event));
                if (len > 24 + sizeof(mgmt->u.assoc_resp)) {
                        event.assoc_reject.resp_ies =
                                (u8 *) mgmt->u.assoc_resp.variable;
                        event.assoc_reject.resp_ies_len =
                                len - 24 - sizeof(mgmt->u.assoc_resp);
                }
                event.assoc_reject.status_code = status;

                wpa_supplicant_event(drv->ctx, EVENT_ASSOC_REJECT, &event);
                return;
        }

        drv->associated = 1;
        os_memcpy(drv->bssid, mgmt->sa, ETH_ALEN);

        os_memset(&event, 0, sizeof(event));
        if (len > 24 + sizeof(mgmt->u.assoc_resp)) {
                event.assoc_info.resp_ies = (u8 *) mgmt->u.assoc_resp.variable;
                event.assoc_info.resp_ies_len =
                        len - 24 - sizeof(mgmt->u.assoc_resp);
        }

        event.assoc_info.freq = drv->assoc_freq;

        wpa_supplicant_event(drv->ctx, EVENT_ASSOC, &event);
}


static void mlme_event_connect(struct wpa_driver_nl80211_data *drv,
                               enum nl80211_commands cmd, struct nlattr *status,
                               struct nlattr *addr, struct nlattr *req_ie,
                               struct nlattr *resp_ie)
{
        union wpa_event_data event;

        if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
                /*
                 * Avoid reporting two association events that would confuse
                 * the core code.
                 */
                wpa_printf(MSG_DEBUG, "nl80211: Ignore connect event (cmd=%d) "
                           "when using userspace SME", cmd);
                return;
        }

        os_memset(&event, 0, sizeof(event));
        if (cmd == NL80211_CMD_CONNECT &&
            nla_get_u16(status) != WLAN_STATUS_SUCCESS) {
                if (resp_ie) {
                        event.assoc_reject.resp_ies = nla_data(resp_ie);
                        event.assoc_reject.resp_ies_len = nla_len(resp_ie);
                }
                event.assoc_reject.status_code = nla_get_u16(status);
                wpa_supplicant_event(drv->ctx, EVENT_ASSOC_REJECT, &event);
                return;
        }

        drv->associated = 1;
        if (addr)
                os_memcpy(drv->bssid, nla_data(addr), ETH_ALEN);

        if (req_ie) {
                event.assoc_info.req_ies = nla_data(req_ie);
                event.assoc_info.req_ies_len = nla_len(req_ie);
        }
        if (resp_ie) {
                event.assoc_info.resp_ies = nla_data(resp_ie);
                event.assoc_info.resp_ies_len = nla_len(resp_ie);
        }

        wpa_supplicant_event(drv->ctx, EVENT_ASSOC, &event);
}


static void mlme_timeout_event(struct wpa_driver_nl80211_data *drv,
                               enum nl80211_commands cmd, struct nlattr *addr)
{
        union wpa_event_data event;
        enum wpa_event_type ev;

        if (nla_len(addr) != ETH_ALEN)
                return;

        wpa_printf(MSG_DEBUG, "nl80211: MLME event %d; timeout with " MACSTR,
                   cmd, MAC2STR((u8 *) nla_data(addr)));

        if (cmd == NL80211_CMD_AUTHENTICATE)
                ev = EVENT_AUTH_TIMED_OUT;
        else if (cmd == NL80211_CMD_ASSOCIATE)
                ev = EVENT_ASSOC_TIMED_OUT;
        else
                return;

        os_memset(&event, 0, sizeof(event));
        os_memcpy(event.timeout_event.addr, nla_data(addr), ETH_ALEN);
        wpa_supplicant_event(drv->ctx, ev, &event);
}


static void mlme_event_action(struct wpa_driver_nl80211_data *drv,
                              struct nlattr *freq, const u8 *frame, size_t len)
{
        const struct ieee80211_mgmt *mgmt;
        union wpa_event_data event;
        u16 fc, stype;

        mgmt = (const struct ieee80211_mgmt *) frame;
        if (len < 24) {
                wpa_printf(MSG_DEBUG, "nl80211: Too short action frame");
                return;
        }

        fc = le_to_host16(mgmt->frame_control);
        stype = WLAN_FC_GET_STYPE(fc);

        os_memset(&event, 0, sizeof(event));
        event.rx_action.da = mgmt->da;
        event.rx_action.sa = mgmt->sa;
        event.rx_action.bssid = mgmt->bssid;
        event.rx_action.category = mgmt->u.action.category;
        event.rx_action.data = &mgmt->u.action.category + 1;
        event.rx_action.len = frame + len - event.rx_action.data;
        if (freq)
                event.rx_action.freq = nla_get_u32(freq);
        wpa_supplicant_event(drv->ctx, EVENT_RX_ACTION, &event);
}


static void mlme_event_action_tx_status(struct wpa_driver_nl80211_data *drv,
                                        struct nlattr *cookie, const u8 *frame,
                                        size_t len, struct nlattr *ack)
{
        union wpa_event_data event;
        const struct ieee80211_hdr *hdr;
        u16 fc;
        u64 cookie_val;

        if (!cookie)
                return;

        cookie_val = nla_get_u64(cookie);
        wpa_printf(MSG_DEBUG, "nl80211: Action TX status: cookie=0%llx%s",
                   (long long unsigned int) cookie_val,
                   cookie_val == drv->send_action_cookie ?
                   " (match)" : " (unknown)");
        if (cookie_val != drv->send_action_cookie)
                return;

        hdr = (const struct ieee80211_hdr *) frame;
        fc = le_to_host16(hdr->frame_control);

        os_memset(&event, 0, sizeof(event));
        event.tx_status.type = WLAN_FC_GET_TYPE(fc);
        event.tx_status.stype = WLAN_FC_GET_STYPE(fc);
        event.tx_status.dst = hdr->addr1;
        event.tx_status.data = frame;
        event.tx_status.data_len = len;
        event.tx_status.ack = ack != NULL;
        wpa_supplicant_event(drv->ctx, EVENT_TX_STATUS, &event);
}


static void mlme_event_deauth_disassoc(struct wpa_driver_nl80211_data *drv,
                                       enum wpa_event_type type,
                                       const u8 *frame, size_t len)
{
        const struct ieee80211_mgmt *mgmt;
        union wpa_event_data event;
        const u8 *bssid = NULL;
        u16 reason_code = 0;

        drv->associated = 0;
        os_memset(&event, 0, sizeof(event));

        mgmt = (const struct ieee80211_mgmt *) frame;
        if (len >= 24)
                bssid = mgmt->bssid;
        /* Note: Same offset for Reason Code in both frame subtypes */
        if (len >= 24 + sizeof(mgmt->u.deauth))
                reason_code = le_to_host16(mgmt->u.deauth.reason_code);

        if (type == EVENT_DISASSOC) {
                event.disassoc_info.addr = bssid;
                event.disassoc_info.reason_code = reason_code;
        } else {
                event.deauth_info.addr = bssid;
                event.deauth_info.reason_code = reason_code;
        }

        wpa_supplicant_event(drv->ctx, type, &event);
}


static void mlme_event(struct wpa_driver_nl80211_data *drv,
                       enum nl80211_commands cmd, struct nlattr *frame,
                       struct nlattr *addr, struct nlattr *timed_out,
                       struct nlattr *freq, struct nlattr *ack,
                       struct nlattr *cookie)
{
        if (timed_out && addr) {
                mlme_timeout_event(drv, cmd, addr);
                return;
        }

        if (frame == NULL) {
                wpa_printf(MSG_DEBUG, "nl80211: MLME event %d without frame "
                           "data", cmd);
                return;
        }

        wpa_printf(MSG_DEBUG, "nl80211: MLME event %d", cmd);
        wpa_hexdump(MSG_MSGDUMP, "nl80211: MLME event frame",
                    nla_data(frame), nla_len(frame));

        switch (cmd) {
        case NL80211_CMD_AUTHENTICATE:
                mlme_event_auth(drv, nla_data(frame), nla_len(frame));
                break;
        case NL80211_CMD_ASSOCIATE:
                mlme_event_assoc(drv, nla_data(frame), nla_len(frame));
                break;
        case NL80211_CMD_DEAUTHENTICATE:
                mlme_event_deauth_disassoc(drv, EVENT_DEAUTH,
                                           nla_data(frame), nla_len(frame));
                break;
        case NL80211_CMD_DISASSOCIATE:
                mlme_event_deauth_disassoc(drv, EVENT_DISASSOC,
                                           nla_data(frame), nla_len(frame));
                break;
        case NL80211_CMD_ACTION:
                mlme_event_action(drv, freq, nla_data(frame), nla_len(frame));
                break;
        case NL80211_CMD_ACTION_TX_STATUS:
                mlme_event_action_tx_status(drv, cookie, nla_data(frame),
                                            nla_len(frame), ack);
                break;
        default:
                break;
        }
}


static void mlme_event_michael_mic_failure(struct wpa_driver_nl80211_data *drv,
                                           struct nlattr *tb[])
{
        union wpa_event_data data;

        wpa_printf(MSG_DEBUG, "nl80211: MLME event Michael MIC failure");
        os_memset(&data, 0, sizeof(data));
        if (tb[NL80211_ATTR_MAC]) {
                wpa_hexdump(MSG_DEBUG, "nl80211: Source MAC address",
                            nla_data(tb[NL80211_ATTR_MAC]),
                            nla_len(tb[NL80211_ATTR_MAC]));
                data.michael_mic_failure.src = nla_data(tb[NL80211_ATTR_MAC]);
        }
        if (tb[NL80211_ATTR_KEY_SEQ]) {
                wpa_hexdump(MSG_DEBUG, "nl80211: TSC",
                            nla_data(tb[NL80211_ATTR_KEY_SEQ]),
                            nla_len(tb[NL80211_ATTR_KEY_SEQ]));
        }
        if (tb[NL80211_ATTR_KEY_TYPE]) {
                enum nl80211_key_type key_type =
                        nla_get_u32(tb[NL80211_ATTR_KEY_TYPE]);
                wpa_printf(MSG_DEBUG, "nl80211: Key Type %d", key_type);
                if (key_type == NL80211_KEYTYPE_PAIRWISE)
                        data.michael_mic_failure.unicast = 1;
        } else
                data.michael_mic_failure.unicast = 1;

        if (tb[NL80211_ATTR_KEY_IDX]) {
                u8 key_id = nla_get_u8(tb[NL80211_ATTR_KEY_IDX]);
                wpa_printf(MSG_DEBUG, "nl80211: Key Id %d", key_id);
        }

        wpa_supplicant_event(drv->ctx, EVENT_MICHAEL_MIC_FAILURE, &data);
}


static void mlme_event_join_ibss(struct wpa_driver_nl80211_data *drv,
                                 struct nlattr *tb[])
{
        if (tb[NL80211_ATTR_MAC] == NULL) {
                wpa_printf(MSG_DEBUG, "nl80211: No address in IBSS joined "
                           "event");
                return;
        }
        os_memcpy(drv->bssid, nla_data(tb[NL80211_ATTR_MAC]), ETH_ALEN);
        drv->associated = 1;
        wpa_printf(MSG_DEBUG, "nl80211: IBSS " MACSTR " joined",
                   MAC2STR(drv->bssid));

        wpa_supplicant_event(drv->ctx, EVENT_ASSOC, NULL);
}


static void mlme_event_remain_on_channel(struct wpa_driver_nl80211_data *drv,
                                         int cancel_event, struct nlattr *tb[])
{
        unsigned int freq, chan_type, duration;
        union wpa_event_data data;
        u64 cookie;

        if (tb[NL80211_ATTR_WIPHY_FREQ])
                freq = nla_get_u32(tb[NL80211_ATTR_WIPHY_FREQ]);
        else
                freq = 0;

        if (tb[NL80211_ATTR_WIPHY_CHANNEL_TYPE])
                chan_type = nla_get_u32(tb[NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
        else
                chan_type = 0;

        if (tb[NL80211_ATTR_DURATION])
                duration = nla_get_u32(tb[NL80211_ATTR_DURATION]);
        else
                duration = 0;

        if (tb[NL80211_ATTR_COOKIE])
                cookie = nla_get_u64(tb[NL80211_ATTR_COOKIE]);
        else
                cookie = 0;

        wpa_printf(MSG_DEBUG, "nl80211: Remain-on-channel event (cancel=%d "
                   "freq=%u channel_type=%u duration=%u cookie=0x%llx (%s))",
                   cancel_event, freq, chan_type, duration,
                   (long long unsigned int) cookie,
                   cookie == drv->remain_on_chan_cookie ? "match" : "unknown");

        if (cookie != drv->remain_on_chan_cookie)
                return; /* not for us */

        drv->pending_remain_on_chan = !cancel_event;

        os_memset(&data, 0, sizeof(data));
        data.remain_on_channel.freq = freq;
        data.remain_on_channel.duration = duration;
        wpa_supplicant_event(drv->ctx, cancel_event ?
                             EVENT_CANCEL_REMAIN_ON_CHANNEL :
                             EVENT_REMAIN_ON_CHANNEL, &data);
}


static void send_scan_event(struct wpa_driver_nl80211_data *drv, int aborted,
                            struct nlattr *tb[])
{
        union wpa_event_data event;
        struct nlattr *nl;
        int rem;
        struct scan_info *info;
#define MAX_REPORT_FREQS 50
        int freqs[MAX_REPORT_FREQS];
        int num_freqs = 0;

        os_memset(&event, 0, sizeof(event));
        info = &event.scan_info;
        info->aborted = aborted;

        if (tb[NL80211_ATTR_SCAN_SSIDS]) {
                nla_for_each_nested(nl, tb[NL80211_ATTR_SCAN_SSIDS], rem) {
                        struct wpa_driver_scan_ssid *s =
                                &info->ssids[info->num_ssids];
                        s->ssid = nla_data(nl);
                        s->ssid_len = nla_len(nl);
                        info->num_ssids++;
                        if (info->num_ssids == WPAS_MAX_SCAN_SSIDS)
                                break;
                }
        }
        if (tb[NL80211_ATTR_SCAN_FREQUENCIES]) {
                nla_for_each_nested(nl, tb[NL80211_ATTR_SCAN_FREQUENCIES], rem)
                {
                        freqs[num_freqs] = nla_get_u32(nl);
                        num_freqs++;
                        if (num_freqs == MAX_REPORT_FREQS - 1)
                                break;
                }
                info->freqs = freqs;
                info->num_freqs = num_freqs;
        }
        wpa_supplicant_event(drv->ctx, EVENT_SCAN_RESULTS, &event);
}


static void nl80211_cqm_event(struct wpa_driver_nl80211_data *drv,
                              struct nlattr *tb[])
{
        static struct nla_policy cqm_policy[NL80211_ATTR_CQM_MAX + 1] = {
                [NL80211_ATTR_CQM_RSSI_THOLD] = { .type = NLA_U32 },
                [NL80211_ATTR_CQM_RSSI_HYST] = { .type = NLA_U8 },
                [NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] = { .type = NLA_U32 },
        };
        struct nlattr *cqm[NL80211_ATTR_CQM_MAX + 1];
        enum nl80211_cqm_rssi_threshold_event event;
        union wpa_event_data ed;

        if (tb[NL80211_ATTR_CQM] == NULL ||
            nla_parse_nested(cqm, NL80211_ATTR_CQM_MAX, tb[NL80211_ATTR_CQM],
                             cqm_policy)) {
                wpa_printf(MSG_DEBUG, "nl80211: Ignore invalid CQM event");
                return;
        }

        if (cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT] == NULL)
                return;
        event = nla_get_u32(cqm[NL80211_ATTR_CQM_RSSI_THRESHOLD_EVENT]);

        os_memset(&ed, 0, sizeof(ed));

        if (event == NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH) {
                wpa_printf(MSG_DEBUG, "nl80211: Connection quality monitor "
                           "event: RSSI high");
                ed.signal_change.above_threshold = 1;
        } else if (event == NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW) {
                wpa_printf(MSG_DEBUG, "nl80211: Connection quality monitor "
                           "event: RSSI low");
                ed.signal_change.above_threshold = 0;
        } else
                return;

        wpa_supplicant_event(drv->ctx, EVENT_SIGNAL_CHANGE, &ed);
}


static int process_event(struct nl_msg *msg, void *arg)
{
        struct wpa_driver_nl80211_data *drv = arg;
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        union wpa_event_data data;

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        if (tb[NL80211_ATTR_IFINDEX]) {
                int ifindex = nla_get_u32(tb[NL80211_ATTR_IFINDEX]);
                if (ifindex != drv->ifindex && !have_ifidx(drv, ifindex)) {
                        wpa_printf(MSG_DEBUG, "nl80211: Ignored event (cmd=%d)"
                                   " for foreign interface (ifindex %d)",
                                   gnlh->cmd, ifindex);
                        return NL_SKIP;
                }
        }

        if (drv->ap_scan_as_station &&
            (gnlh->cmd == NL80211_CMD_NEW_SCAN_RESULTS ||
             gnlh->cmd == NL80211_CMD_SCAN_ABORTED)) {
                wpa_driver_nl80211_set_mode(&drv->first_bss,
                                            IEEE80211_MODE_AP);
                drv->ap_scan_as_station = 0;
        }

        switch (gnlh->cmd) {
        case NL80211_CMD_TRIGGER_SCAN:
                wpa_printf(MSG_DEBUG, "nl80211: Scan trigger");
                break;
        case NL80211_CMD_NEW_SCAN_RESULTS:
                wpa_printf(MSG_DEBUG, "nl80211: New scan results available");
                drv->scan_complete_events = 1;
                eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv,
                                     drv->ctx);
                send_scan_event(drv, 0, tb);
                break;
        case NL80211_CMD_SCAN_ABORTED:
                wpa_printf(MSG_DEBUG, "nl80211: Scan aborted");
                /*
                 * Need to indicate that scan results are available in order
                 * not to make wpa_supplicant stop its scanning.
                 */
                eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv,
                                     drv->ctx);
                send_scan_event(drv, 1, tb);
                break;
        case NL80211_CMD_AUTHENTICATE:
        case NL80211_CMD_ASSOCIATE:
        case NL80211_CMD_DEAUTHENTICATE:
        case NL80211_CMD_DISASSOCIATE:
        case NL80211_CMD_ACTION:
        case NL80211_CMD_ACTION_TX_STATUS:
                mlme_event(drv, gnlh->cmd, tb[NL80211_ATTR_FRAME],
                           tb[NL80211_ATTR_MAC], tb[NL80211_ATTR_TIMED_OUT],
                           tb[NL80211_ATTR_WIPHY_FREQ], tb[NL80211_ATTR_ACK],
                           tb[NL80211_ATTR_COOKIE]);
                break;
        case NL80211_CMD_CONNECT:
        case NL80211_CMD_ROAM:
                mlme_event_connect(drv, gnlh->cmd,
                                   tb[NL80211_ATTR_STATUS_CODE],
                                   tb[NL80211_ATTR_MAC],
                                   tb[NL80211_ATTR_REQ_IE],
                                   tb[NL80211_ATTR_RESP_IE]);
                break;
        case NL80211_CMD_DISCONNECT:
                if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
                        /*
                         * Avoid reporting two disassociation events that could
                         * confuse the core code.
                         */
                        wpa_printf(MSG_DEBUG, "nl80211: Ignore disconnect "
                                   "event when using userspace SME");
                        break;
                }
                drv->associated = 0;
                os_memset(&data, 0, sizeof(data));
                if (tb[NL80211_ATTR_REASON_CODE])
                        data.disassoc_info.reason_code =
                                nla_get_u16(tb[NL80211_ATTR_REASON_CODE]);
                wpa_supplicant_event(drv->ctx, EVENT_DISASSOC, &data);
                break;
        case NL80211_CMD_MICHAEL_MIC_FAILURE:
                mlme_event_michael_mic_failure(drv, tb);
                break;
        case NL80211_CMD_JOIN_IBSS:
                mlme_event_join_ibss(drv, tb);
                break;
        case NL80211_CMD_REMAIN_ON_CHANNEL:
                mlme_event_remain_on_channel(drv, 0, tb);
                break;
        case NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL:
                mlme_event_remain_on_channel(drv, 1, tb);
                break;
        case NL80211_CMD_NOTIFY_CQM:
                nl80211_cqm_event(drv, tb);
                break;
        default:
                wpa_printf(MSG_DEBUG, "nl80211: Ignored unknown event "
                           "(cmd=%d)", gnlh->cmd);
                break;
        }

        return NL_SKIP;
}


static void wpa_driver_nl80211_event_receive(int sock, void *eloop_ctx,
                                             void *sock_ctx)
{
        struct nl_cb *cb;
        struct wpa_driver_nl80211_data *drv = eloop_ctx;

        wpa_printf(MSG_DEBUG, "nl80211: Event message available");

        cb = nl_cb_clone(drv->nl_cb);
        if (!cb)
                return;
        nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, no_seq_check, NULL);
        nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, process_event, drv);
        nl_recvmsgs(drv->nl_handle_event, cb);
        nl_cb_put(cb);
}


static int wpa_driver_nl80211_set_country(void *priv, const char *alpha2_arg)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        char alpha2[3];
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        alpha2[0] = alpha2_arg[0];
        alpha2[1] = alpha2_arg[1];
        alpha2[2] = '\0';

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_REQ_SET_REG, 0);

        NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2, alpha2);
        if (send_and_recv_msgs(drv, msg, NULL, NULL))
                return -EINVAL;
        return 0;
nla_put_failure:
        return -EINVAL;
}


#ifndef HOSTAPD
struct wiphy_info_data {
        int max_scan_ssids;
        int ap_supported;
        int auth_supported;
        int connect_supported;
};


static int wiphy_info_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct wiphy_info_data *info = arg;

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        if (tb[NL80211_ATTR_MAX_NUM_SCAN_SSIDS])
                info->max_scan_ssids =
                        nla_get_u8(tb[NL80211_ATTR_MAX_NUM_SCAN_SSIDS]);

        if (tb[NL80211_ATTR_SUPPORTED_IFTYPES]) {
                struct nlattr *nl_mode;
                int i;
                nla_for_each_nested(nl_mode,
                                    tb[NL80211_ATTR_SUPPORTED_IFTYPES], i) {
                        if (nl_mode->nla_type == NL80211_IFTYPE_AP) {
                                info->ap_supported = 1;
                                break;
                        }
                }
        }

        if (tb[NL80211_ATTR_SUPPORTED_COMMANDS]) {
                struct nlattr *nl_cmd;
                int i;

                nla_for_each_nested(nl_cmd,
                                    tb[NL80211_ATTR_SUPPORTED_COMMANDS], i) {
                        u32 cmd = nla_get_u32(nl_cmd);
                        if (cmd == NL80211_CMD_AUTHENTICATE)
                                info->auth_supported = 1;
                        else if (cmd == NL80211_CMD_CONNECT)
                                info->connect_supported = 1;
                }
        }

        return NL_SKIP;
}


static int wpa_driver_nl80211_get_info(struct wpa_driver_nl80211_data *drv,
                                       struct wiphy_info_data *info)
{
        struct nl_msg *msg;

        os_memset(info, 0, sizeof(*info));
        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_GET_WIPHY, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->first_bss.ifindex);

        if (send_and_recv_msgs(drv, msg, wiphy_info_handler, info) == 0)
                return 0;
        msg = NULL;
nla_put_failure:
        nlmsg_free(msg);
        return -1;
}


static int wpa_driver_nl80211_capa(struct wpa_driver_nl80211_data *drv)
{
        struct wiphy_info_data info;
        if (wpa_driver_nl80211_get_info(drv, &info))
                return -1;
        drv->has_capability = 1;
        /* For now, assume TKIP, CCMP, WPA, WPA2 are supported */
        drv->capa.key_mgmt = WPA_DRIVER_CAPA_KEY_MGMT_WPA |
                WPA_DRIVER_CAPA_KEY_MGMT_WPA_PSK |
                WPA_DRIVER_CAPA_KEY_MGMT_WPA2 |
                WPA_DRIVER_CAPA_KEY_MGMT_WPA2_PSK;
        drv->capa.enc = WPA_DRIVER_CAPA_ENC_WEP40 |
                WPA_DRIVER_CAPA_ENC_WEP104 |
                WPA_DRIVER_CAPA_ENC_TKIP |
                WPA_DRIVER_CAPA_ENC_CCMP;
        drv->capa.auth = WPA_DRIVER_AUTH_OPEN |
                WPA_DRIVER_AUTH_SHARED |
                WPA_DRIVER_AUTH_LEAP;

        drv->capa.max_scan_ssids = info.max_scan_ssids;
        if (info.ap_supported)
                drv->capa.flags |= WPA_DRIVER_FLAGS_AP;

        if (info.auth_supported)
                drv->capa.flags |= WPA_DRIVER_FLAGS_SME;
        else if (!info.connect_supported) {
                wpa_printf(MSG_INFO, "nl80211: Driver does not support "
                           "authentication/association or connect commands");
                return -1;
        }

        drv->capa.flags |= WPA_DRIVER_FLAGS_SET_KEYS_AFTER_ASSOC_DONE;
        drv->capa.max_remain_on_chan = 5000;

        return 0;
}
#endif /* HOSTAPD */


static int wpa_driver_nl80211_init_nl(struct wpa_driver_nl80211_data *drv,
                                      void *ctx)
{
        int ret;

        /* Initialize generic netlink and nl80211 */

        drv->nl_cb = nl_cb_alloc(NL_CB_DEFAULT);
        if (drv->nl_cb == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink "
                           "callbacks");
                goto err1;
        }

        drv->nl_handle = nl_handle_alloc_cb(drv->nl_cb);
        if (drv->nl_handle == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink "
                           "callbacks");
                goto err2;
        }

        drv->nl_handle_event = nl_handle_alloc_cb(drv->nl_cb);
        if (drv->nl_handle_event == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate netlink "
                           "callbacks (event)");
                goto err2b;
        }

        if (genl_connect(drv->nl_handle)) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to connect to generic "
                           "netlink");
                goto err3;
        }

        if (genl_connect(drv->nl_handle_event)) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to connect to generic "
                           "netlink (event)");
                goto err3;
        }

#ifdef CONFIG_LIBNL20
        if (genl_ctrl_alloc_cache(drv->nl_handle, &drv->nl_cache) < 0) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
                           "netlink cache");
                goto err3;
        }
        if (genl_ctrl_alloc_cache(drv->nl_handle_event, &drv->nl_cache_event) <
            0) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
                           "netlink cache (event)");
                goto err3b;
        }
#else /* CONFIG_LIBNL20 */
        drv->nl_cache = genl_ctrl_alloc_cache(drv->nl_handle);
        if (drv->nl_cache == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
                           "netlink cache");
                goto err3;
        }
        drv->nl_cache_event = genl_ctrl_alloc_cache(drv->nl_handle_event);
        if (drv->nl_cache_event == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to allocate generic "
                           "netlink cache (event)");
                goto err3b;
        }
#endif /* CONFIG_LIBNL20 */

        drv->nl80211 = genl_ctrl_search_by_name(drv->nl_cache, "nl80211");
        if (drv->nl80211 == NULL) {
                wpa_printf(MSG_ERROR, "nl80211: 'nl80211' generic netlink not "
                           "found");
                goto err4;
        }

        ret = nl_get_multicast_id(drv, "nl80211", "scan");
        if (ret >= 0)
                ret = nl_socket_add_membership(drv->nl_handle_event, ret);
        if (ret < 0) {
                wpa_printf(MSG_ERROR, "nl80211: Could not add multicast "
                           "membership for scan events: %d (%s)",
                           ret, strerror(-ret));
                goto err4;
        }

        ret = nl_get_multicast_id(drv, "nl80211", "mlme");
        if (ret >= 0)
                ret = nl_socket_add_membership(drv->nl_handle_event, ret);
        if (ret < 0) {
                wpa_printf(MSG_ERROR, "nl80211: Could not add multicast "
                           "membership for mlme events: %d (%s)",
                           ret, strerror(-ret));
                goto err4;
        }

        eloop_register_read_sock(nl_socket_get_fd(drv->nl_handle_event),
                                 wpa_driver_nl80211_event_receive, drv, ctx);

        return 0;

err4:
        nl_cache_free(drv->nl_cache_event);
err3b:
        nl_cache_free(drv->nl_cache);
err3:
        nl_handle_destroy(drv->nl_handle_event);
err2b:
        nl_handle_destroy(drv->nl_handle);
err2:
        nl_cb_put(drv->nl_cb);
err1:
        return -1;
}


static void * wpa_driver_nl80211_init(void *ctx, const char *ifname)
{
        struct wpa_driver_nl80211_data *drv;
        struct netlink_config *cfg;
        struct i802_bss *bss;

        drv = os_zalloc(sizeof(*drv));
        if (drv == NULL)
                return NULL;
        drv->ctx = ctx;
        bss = &drv->first_bss;
        bss->drv = drv;
        os_strlcpy(bss->ifname, ifname, sizeof(bss->ifname));
        drv->monitor_ifidx = -1;
        drv->monitor_sock = -1;
        drv->ioctl_sock = -1;

        if (wpa_driver_nl80211_init_nl(drv, ctx)) {
                os_free(drv);
                return NULL;
        }

        drv->ioctl_sock = socket(PF_INET, SOCK_DGRAM, 0);
        if (drv->ioctl_sock < 0) {
                perror("socket(PF_INET,SOCK_DGRAM)");
                goto failed;
        }

        cfg = os_zalloc(sizeof(*cfg));
        if (cfg == NULL)
                goto failed;
        cfg->ctx = drv;
        cfg->newlink_cb = wpa_driver_nl80211_event_rtm_newlink;
        cfg->dellink_cb = wpa_driver_nl80211_event_rtm_dellink;
        drv->netlink = netlink_init(cfg);
        if (drv->netlink == NULL) {
                os_free(cfg);
                goto failed;
        }
        if (wpa_driver_nl80211_finish_drv_init(drv))
                goto failed;

        return bss;

failed:
        netlink_deinit(drv->netlink);
        if (drv->ioctl_sock >= 0)
                close(drv->ioctl_sock);

        genl_family_put(drv->nl80211);
        nl_cache_free(drv->nl_cache);
        nl_handle_destroy(drv->nl_handle);
        nl_cb_put(drv->nl_cb);
        eloop_unregister_read_sock(nl_socket_get_fd(drv->nl_handle_event));

        os_free(drv);
        return NULL;
}


static int nl80211_register_action_frame(struct wpa_driver_nl80211_data *drv,
                                         const u8 *match, size_t match_len)
{
        struct nl_msg *msg;
        int ret = -1;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_REGISTER_ACTION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT(msg, NL80211_ATTR_FRAME_MATCH, match_len, match);

        ret = send_and_recv(drv, drv->nl_handle_event, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Register Action command "
                           "failed: ret=%d (%s)", ret, strerror(-ret));
                wpa_hexdump(MSG_DEBUG, "nl80211: Register Action match",
                            match, match_len);
                goto nla_put_failure;
        }
        ret = 0;
nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int nl80211_register_action_frames(struct wpa_driver_nl80211_data *drv)
{
        /* FT Action frames */
        if (nl80211_register_action_frame(drv, (u8 *) "\x06", 1) < 0)
                return -1;
        else
                drv->capa.key_mgmt |= WPA_DRIVER_CAPA_KEY_MGMT_FT |
                        WPA_DRIVER_CAPA_KEY_MGMT_FT_PSK;

        return 0;
}


static int
wpa_driver_nl80211_finish_drv_init(struct wpa_driver_nl80211_data *drv)
{
        struct i802_bss *bss = &drv->first_bss;

        drv->ifindex = if_nametoindex(bss->ifname);
        drv->first_bss.ifindex = drv->ifindex;

#ifndef HOSTAPD
        if (wpa_driver_nl80211_set_mode(bss, IEEE80211_MODE_INFRA) < 0) {
                wpa_printf(MSG_DEBUG, "nl80211: Could not configure driver to "
                           "use managed mode");
        }

        if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 1)) {
                wpa_printf(MSG_ERROR, "Could not set interface '%s' UP",
                           bss->ifname);
                return -1;
        }

        if (wpa_driver_nl80211_capa(drv))
                return -1;

        netlink_send_oper_ifla(drv->netlink, drv->ifindex,
                               1, IF_OPER_DORMANT);
#endif /* HOSTAPD */

        if (nl80211_register_action_frames(drv) < 0) {
                wpa_printf(MSG_DEBUG, "nl80211: Failed to register Action "
                           "frame processing - ignore for now");
                /*
                 * Older kernel versions did not support this, so ignore the
                 * error for now. Some functionality may not be available
                 * because of this.
                 */
        }

        return 0;
}


static int wpa_driver_nl80211_del_beacon(struct wpa_driver_nl80211_data *drv)
{
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_DEL_BEACON, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        return -ENOBUFS;
}


static void wpa_driver_nl80211_deinit(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;

        if (drv->added_if_into_bridge) {
                if (linux_br_del_if(drv->ioctl_sock, drv->brname, bss->ifname)
                    < 0)
                        wpa_printf(MSG_INFO, "nl80211: Failed to remove "
                                   "interface %s from bridge %s: %s",
                                   bss->ifname, drv->brname, strerror(errno));
        }
        if (drv->added_bridge) {
                if (linux_br_del(drv->ioctl_sock, drv->brname) < 0)
                        wpa_printf(MSG_INFO, "nl80211: Failed to remove "
                                   "bridge %s: %s",
                                   drv->brname, strerror(errno));
        }

        nl80211_remove_monitor_interface(drv);

        if (drv->nlmode == NL80211_IFTYPE_AP)
                wpa_driver_nl80211_del_beacon(drv);

#ifdef HOSTAPD
        if (drv->last_freq_ht) {
                /* Clear HT flags from the driver */
                struct hostapd_freq_params freq;
                os_memset(&freq, 0, sizeof(freq));
                freq.freq = drv->last_freq;
                i802_set_freq(priv, &freq);
        }

        if (drv->eapol_sock >= 0) {
                eloop_unregister_read_sock(drv->eapol_sock);
                close(drv->eapol_sock);
        }

        if (drv->if_indices != drv->default_if_indices)
                os_free(drv->if_indices);
#endif /* HOSTAPD */

        if (drv->disable_11b_rates)
                nl80211_disable_11b_rates(drv, drv->ifindex, 0);

        netlink_send_oper_ifla(drv->netlink, drv->ifindex, 0, IF_OPER_UP);
        netlink_deinit(drv->netlink);

        eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);

        (void) linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 0);
        wpa_driver_nl80211_set_mode(bss, IEEE80211_MODE_INFRA);

        if (drv->ioctl_sock >= 0)
                close(drv->ioctl_sock);

        eloop_unregister_read_sock(nl_socket_get_fd(drv->nl_handle_event));
        genl_family_put(drv->nl80211);
        nl_cache_free(drv->nl_cache);
        nl_cache_free(drv->nl_cache_event);
        nl_handle_destroy(drv->nl_handle);
        nl_handle_destroy(drv->nl_handle_event);
        nl_cb_put(drv->nl_cb);

        eloop_cancel_timeout(wpa_driver_nl80211_probe_req_report_timeout,
                             drv, NULL);

        os_free(drv->filter_ssids);

        os_free(drv);
}


static void wpa_driver_nl80211_scan_timeout(void *eloop_ctx, void *timeout_ctx)
{
        struct wpa_driver_nl80211_data *drv = eloop_ctx;
        if (drv->ap_scan_as_station) {
                wpa_driver_nl80211_set_mode(&drv->first_bss,
                                            IEEE80211_MODE_AP);
                drv->ap_scan_as_station = 0;
        }
        wpa_printf(MSG_DEBUG, "Scan timeout - try to get results");
        wpa_supplicant_event(timeout_ctx, EVENT_SCAN_RESULTS, NULL);
}


static int wpa_driver_nl80211_scan(void *priv,
                                   struct wpa_driver_scan_params *params)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret = 0, timeout;
        struct nl_msg *msg, *ssids, *freqs;
        size_t i;

        msg = nlmsg_alloc();
        ssids = nlmsg_alloc();
        freqs = nlmsg_alloc();
        if (!msg || !ssids || !freqs) {
                nlmsg_free(msg);
                nlmsg_free(ssids);
                nlmsg_free(freqs);
                return -1;
        }

        os_free(drv->filter_ssids);
        drv->filter_ssids = params->filter_ssids;
        params->filter_ssids = NULL;
        drv->num_filter_ssids = params->num_filter_ssids;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_TRIGGER_SCAN, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);

        for (i = 0; i < params->num_ssids; i++) {
                wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan SSID",
                                  params->ssids[i].ssid,
                                  params->ssids[i].ssid_len);
                NLA_PUT(ssids, i + 1, params->ssids[i].ssid_len,
                        params->ssids[i].ssid);
        }
        if (params->num_ssids)
                nla_put_nested(msg, NL80211_ATTR_SCAN_SSIDS, ssids);

        if (params->extra_ies) {
                wpa_hexdump_ascii(MSG_MSGDUMP, "nl80211: Scan extra IEs",
                                  params->extra_ies, params->extra_ies_len);
                NLA_PUT(msg, NL80211_ATTR_IE, params->extra_ies_len,
                        params->extra_ies);
        }

        if (params->freqs) {
                for (i = 0; params->freqs[i]; i++) {
                        wpa_printf(MSG_MSGDUMP, "nl80211: Scan frequency %u "
                                   "MHz", params->freqs[i]);
                        NLA_PUT_U32(freqs, i + 1, params->freqs[i]);
                }
                nla_put_nested(msg, NL80211_ATTR_SCAN_FREQUENCIES, freqs);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Scan trigger failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
#ifdef HOSTAPD
                if (drv->nlmode == NL80211_IFTYPE_AP) {
                        /*
                         * mac80211 does not allow scan requests in AP mode, so
                         * try to do this in station mode.
                         */
                        if (wpa_driver_nl80211_set_mode(bss,
                                                        IEEE80211_MODE_INFRA))
                                goto nla_put_failure;

                        if (wpa_driver_nl80211_scan(drv, params)) {
                                wpa_driver_nl80211_set_mode(bss,
                                                            IEEE80211_MODE_AP);
                                goto nla_put_failure;
                        }

                        /* Restore AP mode when processing scan results */
                        drv->ap_scan_as_station = 1;
                        ret = 0;
                } else
                        goto nla_put_failure;
#else /* HOSTAPD */
                goto nla_put_failure;
#endif /* HOSTAPD */
        }

        /* Not all drivers generate "scan completed" wireless event, so try to
         * read results after a timeout. */
        timeout = 10;
        if (drv->scan_complete_events) {
                /*
                 * The driver seems to deliver events to notify when scan is
                 * complete, so use longer timeout to avoid race conditions
                 * with scanning and following association request.
                 */
                timeout = 30;
        }
        wpa_printf(MSG_DEBUG, "Scan requested (ret=%d) - scan timeout %d "
                   "seconds", ret, timeout);
        eloop_cancel_timeout(wpa_driver_nl80211_scan_timeout, drv, drv->ctx);
        eloop_register_timeout(timeout, 0, wpa_driver_nl80211_scan_timeout,
                               drv, drv->ctx);

nla_put_failure:
        nlmsg_free(ssids);
        nlmsg_free(msg);
        nlmsg_free(freqs);
        return ret;
}


static const u8 * nl80211_get_ie(const u8 *ies, size_t ies_len, u8 ie)
{
        const u8 *end, *pos;

        if (ies == NULL)
                return NULL;

        pos = ies;
        end = ies + ies_len;

        while (pos + 1 < end) {
                if (pos + 2 + pos[1] > end)
                        break;
                if (pos[0] == ie)
                        return pos;
                pos += 2 + pos[1];
        }

        return NULL;
}


static int nl80211_scan_filtered(struct wpa_driver_nl80211_data *drv,
                                 const u8 *ie, size_t ie_len)
{
        const u8 *ssid;
        size_t i;

        if (drv->filter_ssids == NULL)
                return 0;

        ssid = nl80211_get_ie(ie, ie_len, WLAN_EID_SSID);
        if (ssid == NULL)
                return 1;

        for (i = 0; i < drv->num_filter_ssids; i++) {
                if (ssid[1] == drv->filter_ssids[i].ssid_len &&
                    os_memcmp(ssid + 2, drv->filter_ssids[i].ssid, ssid[1]) ==
                    0)
                        return 0;
        }

        return 1;
}


struct nl80211_bss_info_arg {
        struct wpa_driver_nl80211_data *drv;
        struct wpa_scan_results *res;
};

static int bss_info_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct nlattr *bss[NL80211_BSS_MAX + 1];
        static struct nla_policy bss_policy[NL80211_BSS_MAX + 1] = {
                [NL80211_BSS_BSSID] = { .type = NLA_UNSPEC },
                [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 },
                [NL80211_BSS_TSF] = { .type = NLA_U64 },
                [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 },
                [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 },
                [NL80211_BSS_INFORMATION_ELEMENTS] = { .type = NLA_UNSPEC },
                [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 },
                [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 },
                [NL80211_BSS_STATUS] = { .type = NLA_U32 },
                [NL80211_BSS_SEEN_MS_AGO] = { .type = NLA_U32 },
                [NL80211_BSS_BEACON_IES] = { .type = NLA_UNSPEC },
        };
        struct nl80211_bss_info_arg *_arg = arg;
        struct wpa_scan_results *res = _arg->res;
        struct wpa_scan_res **tmp;
        struct wpa_scan_res *r;
        const u8 *ie, *beacon_ie;
        size_t ie_len, beacon_ie_len;
        u8 *pos;

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);
        if (!tb[NL80211_ATTR_BSS])
                return NL_SKIP;
        if (nla_parse_nested(bss, NL80211_BSS_MAX, tb[NL80211_ATTR_BSS],
                             bss_policy))
                return NL_SKIP;
        if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) {
                ie = nla_data(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
                ie_len = nla_len(bss[NL80211_BSS_INFORMATION_ELEMENTS]);
        } else {
                ie = NULL;
                ie_len = 0;
        }
        if (bss[NL80211_BSS_BEACON_IES]) {
                beacon_ie = nla_data(bss[NL80211_BSS_BEACON_IES]);
                beacon_ie_len = nla_len(bss[NL80211_BSS_BEACON_IES]);
        } else {
                beacon_ie = NULL;
                beacon_ie_len = 0;
        }

        if (nl80211_scan_filtered(_arg->drv, ie ? ie : beacon_ie,
                                  ie ? ie_len : beacon_ie_len))
                return NL_SKIP;

        r = os_zalloc(sizeof(*r) + ie_len + beacon_ie_len);
        if (r == NULL)
                return NL_SKIP;
        if (bss[NL80211_BSS_BSSID])
                os_memcpy(r->bssid, nla_data(bss[NL80211_BSS_BSSID]),
                          ETH_ALEN);
        if (bss[NL80211_BSS_FREQUENCY])
                r->freq = nla_get_u32(bss[NL80211_BSS_FREQUENCY]);
        if (bss[NL80211_BSS_BEACON_INTERVAL])
                r->beacon_int = nla_get_u16(bss[NL80211_BSS_BEACON_INTERVAL]);
        if (bss[NL80211_BSS_CAPABILITY])
                r->caps = nla_get_u16(bss[NL80211_BSS_CAPABILITY]);
        r->flags |= WPA_SCAN_NOISE_INVALID;
        if (bss[NL80211_BSS_SIGNAL_MBM]) {
                r->level = nla_get_u32(bss[NL80211_BSS_SIGNAL_MBM]);
                r->level /= 100; /* mBm to dBm */
                r->flags |= WPA_SCAN_LEVEL_DBM | WPA_SCAN_QUAL_INVALID;
        } else if (bss[NL80211_BSS_SIGNAL_UNSPEC]) {
                r->level = nla_get_u8(bss[NL80211_BSS_SIGNAL_UNSPEC]);
                r->flags |= WPA_SCAN_LEVEL_INVALID;
        } else
                r->flags |= WPA_SCAN_LEVEL_INVALID | WPA_SCAN_QUAL_INVALID;
        if (bss[NL80211_BSS_TSF])
                r->tsf = nla_get_u64(bss[NL80211_BSS_TSF]);
        if (bss[NL80211_BSS_SEEN_MS_AGO])
                r->age = nla_get_u32(bss[NL80211_BSS_SEEN_MS_AGO]);
        r->ie_len = ie_len;
        pos = (u8 *) (r + 1);
        if (ie) {
                os_memcpy(pos, ie, ie_len);
                pos += ie_len;
        }
        r->beacon_ie_len = beacon_ie_len;
        if (beacon_ie)
                os_memcpy(pos, beacon_ie, beacon_ie_len);

        if (bss[NL80211_BSS_STATUS]) {
                enum nl80211_bss_status status;
                status = nla_get_u32(bss[NL80211_BSS_STATUS]);
                switch (status) {
                case NL80211_BSS_STATUS_AUTHENTICATED:
                        r->flags |= WPA_SCAN_AUTHENTICATED;
                        break;
                case NL80211_BSS_STATUS_ASSOCIATED:
                        r->flags |= WPA_SCAN_ASSOCIATED;
                        break;
                default:
                        break;
                }
        }

        tmp = os_realloc(res->res,
                         (res->num + 1) * sizeof(struct wpa_scan_res *));
        if (tmp == NULL) {
                os_free(r);
                return NL_SKIP;
        }
        tmp[res->num++] = r;
        res->res = tmp;

        return NL_SKIP;
}


static void clear_state_mismatch(struct wpa_driver_nl80211_data *drv,
                                 const u8 *addr)
{
        if (drv->capa.flags & WPA_DRIVER_FLAGS_SME) {
                wpa_printf(MSG_DEBUG, "nl80211: Clear possible state "
                           "mismatch (" MACSTR ")", MAC2STR(addr));
                wpa_driver_nl80211_mlme(drv, addr,
                                        NL80211_CMD_DEAUTHENTICATE,
                                        WLAN_REASON_PREV_AUTH_NOT_VALID, 1);
        }
}


static void wpa_driver_nl80211_check_bss_status(
        struct wpa_driver_nl80211_data *drv, struct wpa_scan_results *res)
{
        size_t i;

        for (i = 0; i < res->num; i++) {
                struct wpa_scan_res *r = res->res[i];
                if (r->flags & WPA_SCAN_AUTHENTICATED) {
                        wpa_printf(MSG_DEBUG, "nl80211: Scan results "
                                   "indicates BSS status with " MACSTR
                                   " as authenticated",
                                   MAC2STR(r->bssid));
                        if (drv->nlmode == NL80211_IFTYPE_STATION &&
                            os_memcmp(r->bssid, drv->bssid, ETH_ALEN) != 0 &&
                            os_memcmp(r->bssid, drv->auth_bssid, ETH_ALEN) !=
                            0) {
                                wpa_printf(MSG_DEBUG, "nl80211: Unknown BSSID"
                                           " in local state (auth=" MACSTR
                                           " assoc=" MACSTR ")",
                                           MAC2STR(drv->auth_bssid),
                                           MAC2STR(drv->bssid));
                                clear_state_mismatch(drv, r->bssid);
                        }
                }

                if (r->flags & WPA_SCAN_ASSOCIATED) {
                        wpa_printf(MSG_DEBUG, "nl80211: Scan results "
                                   "indicate BSS status with " MACSTR
                                   " as associated",
                                   MAC2STR(r->bssid));
                        if (drv->nlmode == NL80211_IFTYPE_STATION &&
                            !drv->associated) {
                                wpa_printf(MSG_DEBUG, "nl80211: Local state "
                                           "(not associated) does not match "
                                           "with BSS state");
                                clear_state_mismatch(drv, r->bssid);
                        } else if (drv->nlmode == NL80211_IFTYPE_STATION &&
                                   os_memcmp(drv->bssid, r->bssid, ETH_ALEN) !=
                                   0) {
                                wpa_printf(MSG_DEBUG, "nl80211: Local state "
                                           "(associated with " MACSTR ") does "
                                           "not match with BSS state",
                                           MAC2STR(drv->bssid));
                                clear_state_mismatch(drv, r->bssid);
                                clear_state_mismatch(drv, drv->bssid);
                        }
                }
        }
}


static void wpa_scan_results_free(struct wpa_scan_results *res)
{
        size_t i;

        if (res == NULL)
                return;

        for (i = 0; i < res->num; i++)
                os_free(res->res[i]);
        os_free(res->res);
        os_free(res);
}


static struct wpa_scan_results *
nl80211_get_scan_results(struct wpa_driver_nl80211_data *drv)
{
        struct nl_msg *msg;
        struct wpa_scan_results *res;
        int ret;
        struct nl80211_bss_info_arg arg;

        res = os_zalloc(sizeof(*res));
        if (res == NULL)
                return NULL;
        msg = nlmsg_alloc();
        if (!msg)
                goto nla_put_failure;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, NLM_F_DUMP,
                    NL80211_CMD_GET_SCAN, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);

        arg.drv = drv;
        arg.res = res;
        ret = send_and_recv_msgs(drv, msg, bss_info_handler, &arg);
        msg = NULL;
        if (ret == 0) {
                wpa_printf(MSG_DEBUG, "Received scan results (%lu BSSes)",
                           (unsigned long) res->num);
                return res;
        }
        wpa_printf(MSG_DEBUG, "nl80211: Scan result fetch failed: ret=%d "
                   "(%s)", ret, strerror(-ret));
nla_put_failure:
        nlmsg_free(msg);
        wpa_scan_results_free(res);
        return NULL;
}


static struct wpa_scan_results *
wpa_driver_nl80211_get_scan_results(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct wpa_scan_results *res;

        res = nl80211_get_scan_results(drv);
        if (res)
                wpa_driver_nl80211_check_bss_status(drv, res);
        return res;
}


static void nl80211_dump_scan(struct wpa_driver_nl80211_data *drv)
{
        struct wpa_scan_results *res;
        size_t i;

        res = nl80211_get_scan_results(drv);
        if (res == NULL) {
                wpa_printf(MSG_DEBUG, "nl80211: Failed to get scan results");
                return;
        }

        wpa_printf(MSG_DEBUG, "nl80211: Scan result dump");
        for (i = 0; i < res->num; i++) {
                struct wpa_scan_res *r = res->res[i];
                wpa_printf(MSG_DEBUG, "nl80211: %d/%d " MACSTR "%s%s",
                           (int) i, (int) res->num, MAC2STR(r->bssid),
                           r->flags & WPA_SCAN_AUTHENTICATED ? " [auth]" : "",
                           r->flags & WPA_SCAN_ASSOCIATED ? " [assoc]" : "");
        }

        wpa_scan_results_free(res);
}


static int wpa_driver_nl80211_set_key(const char *ifname, void *priv,
                                      enum wpa_alg alg, const u8 *addr,
                                      int key_idx, int set_tx,
                                      const u8 *seq, size_t seq_len,
                                      const u8 *key, size_t key_len)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ifindex = if_nametoindex(ifname);
        struct nl_msg *msg;
        int ret;

        wpa_printf(MSG_DEBUG, "%s: ifindex=%d alg=%d addr=%p key_idx=%d "
                   "set_tx=%d seq_len=%lu key_len=%lu",
                   __func__, ifindex, alg, addr, key_idx, set_tx,
                   (unsigned long) seq_len, (unsigned long) key_len);

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        if (alg == WPA_ALG_NONE) {
                genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                            0, NL80211_CMD_DEL_KEY, 0);
        } else {
                genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                            0, NL80211_CMD_NEW_KEY, 0);
                NLA_PUT(msg, NL80211_ATTR_KEY_DATA, key_len, key);
                switch (alg) {
                case WPA_ALG_WEP:
                        if (key_len == 5)
                                NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
                                            WLAN_CIPHER_SUITE_WEP40);
                        else
                                NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
                                            WLAN_CIPHER_SUITE_WEP104);
                        break;
                case WPA_ALG_TKIP:
                        NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_TKIP);
                        break;
                case WPA_ALG_CCMP:
                        NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_CCMP);
                        break;
                case WPA_ALG_IGTK:
                        NLA_PUT_U32(msg, NL80211_ATTR_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_AES_CMAC);
                        break;
                default:
                        wpa_printf(MSG_ERROR, "%s: Unsupported encryption "
                                   "algorithm %d", __func__, alg);
                        nlmsg_free(msg);
                        return -1;
                }
        }

        if (seq && seq_len)
                NLA_PUT(msg, NL80211_ATTR_KEY_SEQ, seq_len, seq);

        if (addr && os_memcmp(addr, "\xff\xff\xff\xff\xff\xff", ETH_ALEN) != 0)
        {
                wpa_printf(MSG_DEBUG, "   addr=" MACSTR, MAC2STR(addr));
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
        }
        NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if ((ret == -ENOENT || ret == -ENOLINK) && alg == WPA_ALG_NONE)
                ret = 0;
        if (ret)
                wpa_printf(MSG_DEBUG, "nl80211: set_key failed; err=%d %s)",
                           ret, strerror(-ret));

        /*
         * If we failed or don't need to set the default TX key (below),
         * we're done here.
         */
        if (ret || !set_tx || alg == WPA_ALG_NONE)
                return ret;
#ifdef HOSTAPD
        if (addr)
                return ret;
#else /* HOSTAPD */
        if (drv->nlmode == NL80211_IFTYPE_AP && addr)
                return ret;
#endif /* HOSTAPD */

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_KEY, 0);
        NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, key_idx);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
        if (alg == WPA_ALG_IGTK)
                NLA_PUT_FLAG(msg, NL80211_ATTR_KEY_DEFAULT_MGMT);
        else
                NLA_PUT_FLAG(msg, NL80211_ATTR_KEY_DEFAULT);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret == -ENOENT)
                ret = 0;
        if (ret)
                wpa_printf(MSG_DEBUG, "nl80211: set_key default failed; "
                           "err=%d %s)", ret, strerror(-ret));
        return ret;

nla_put_failure:
        return -ENOBUFS;
}


static int nl_add_key(struct nl_msg *msg, enum wpa_alg alg,
                      int key_idx, int defkey,
                      const u8 *seq, size_t seq_len,
                      const u8 *key, size_t key_len)
{
        struct nlattr *key_attr = nla_nest_start(msg, NL80211_ATTR_KEY);
        if (!key_attr)
                return -1;

        if (defkey && alg == WPA_ALG_IGTK)
                NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT_MGMT);
        else if (defkey)
                NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);

        NLA_PUT_U8(msg, NL80211_KEY_IDX, key_idx);

        switch (alg) {
        case WPA_ALG_WEP:
                if (key_len == 5)
                        NLA_PUT_U32(msg, NL80211_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_WEP40);
                else
                        NLA_PUT_U32(msg, NL80211_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_WEP104);
                break;
        case WPA_ALG_TKIP:
                NLA_PUT_U32(msg, NL80211_KEY_CIPHER, WLAN_CIPHER_SUITE_TKIP);
                break;
        case WPA_ALG_CCMP:
                NLA_PUT_U32(msg, NL80211_KEY_CIPHER, WLAN_CIPHER_SUITE_CCMP);
                break;
        case WPA_ALG_IGTK:
                NLA_PUT_U32(msg, NL80211_KEY_CIPHER,
                            WLAN_CIPHER_SUITE_AES_CMAC);
                break;
        default:
                wpa_printf(MSG_ERROR, "%s: Unsupported encryption "
                           "algorithm %d", __func__, alg);
                return -1;
        }

        if (seq && seq_len)
                NLA_PUT(msg, NL80211_KEY_SEQ, seq_len, seq);

        NLA_PUT(msg, NL80211_KEY_DATA, key_len, key);

        nla_nest_end(msg, key_attr);

        return 0;
 nla_put_failure:
        return -1;
}


static int nl80211_set_conn_keys(struct wpa_driver_associate_params *params,
                                 struct nl_msg *msg)
{
        int i, privacy = 0;
        struct nlattr *nl_keys, *nl_key;

        for (i = 0; i < 4; i++) {
                if (!params->wep_key[i])
                        continue;
                privacy = 1;
                break;
        }
        if (!privacy)
                return 0;

        NLA_PUT_FLAG(msg, NL80211_ATTR_PRIVACY);

        nl_keys = nla_nest_start(msg, NL80211_ATTR_KEYS);
        if (!nl_keys)
                goto nla_put_failure;

        for (i = 0; i < 4; i++) {
                if (!params->wep_key[i])
                        continue;

                nl_key = nla_nest_start(msg, i);
                if (!nl_key)
                        goto nla_put_failure;

                NLA_PUT(msg, NL80211_KEY_DATA, params->wep_key_len[i],
                        params->wep_key[i]);
                if (params->wep_key_len[i] == 5)
                        NLA_PUT_U32(msg, NL80211_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_WEP40);
                else
                        NLA_PUT_U32(msg, NL80211_KEY_CIPHER,
                                    WLAN_CIPHER_SUITE_WEP104);

                NLA_PUT_U8(msg, NL80211_KEY_IDX, i);

                if (i == params->wep_tx_keyidx)
                        NLA_PUT_FLAG(msg, NL80211_KEY_DEFAULT);

                nla_nest_end(msg, nl_key);
        }
        nla_nest_end(msg, nl_keys);

        return 0;

nla_put_failure:
        return -ENOBUFS;
}


static int wpa_driver_nl80211_mlme(struct wpa_driver_nl80211_data *drv,
                                   const u8 *addr, int cmd, u16 reason_code,
                                   int local_state_change)
{
        int ret = -1;
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0, cmd, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U16(msg, NL80211_ATTR_REASON_CODE, reason_code);
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
        if (local_state_change)
                NLA_PUT_FLAG(msg, NL80211_ATTR_LOCAL_STATE_CHANGE);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: MLME command failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                goto nla_put_failure;
        }
        ret = 0;

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int wpa_driver_nl80211_disconnect(struct wpa_driver_nl80211_data *drv,
                                         const u8 *addr, int reason_code)
{
        wpa_printf(MSG_DEBUG, "%s", __func__);
        drv->associated = 0;
        return wpa_driver_nl80211_mlme(drv, addr, NL80211_CMD_DISCONNECT,
                                       reason_code, 0);
}


static int wpa_driver_nl80211_deauthenticate(void *priv, const u8 *addr,
                                             int reason_code)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (!(drv->capa.flags & WPA_DRIVER_FLAGS_SME))
                return wpa_driver_nl80211_disconnect(drv, addr, reason_code);
        wpa_printf(MSG_DEBUG, "%s", __func__);
        drv->associated = 0;
        return wpa_driver_nl80211_mlme(drv, addr, NL80211_CMD_DEAUTHENTICATE,
                                       reason_code, 0);
}


static int wpa_driver_nl80211_disassociate(void *priv, const u8 *addr,
                                           int reason_code)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (!(drv->capa.flags & WPA_DRIVER_FLAGS_SME))
                return wpa_driver_nl80211_disconnect(drv, addr, reason_code);
        wpa_printf(MSG_DEBUG, "%s", __func__);
        drv->associated = 0;
        return wpa_driver_nl80211_mlme(drv, addr, NL80211_CMD_DISASSOCIATE,
                                       reason_code, 0);
}


static int wpa_driver_nl80211_authenticate(
        void *priv, struct wpa_driver_auth_params *params)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret = -1, i;
        struct nl_msg *msg;
        enum nl80211_auth_type type;
        int count = 0;

        drv->associated = 0;
        os_memset(drv->auth_bssid, 0, ETH_ALEN);
        /* FIX: IBSS mode */
        if (drv->nlmode != NL80211_IFTYPE_STATION)
                wpa_driver_nl80211_set_mode(priv, IEEE80211_MODE_INFRA);

        if (wpa_driver_nl80211_set_mode(priv, IEEE80211_MODE_INFRA) < 0)
                return -1;

retry:
        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        wpa_printf(MSG_DEBUG, "nl80211: Authenticate (ifindex=%d)",
                   drv->ifindex);

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_AUTHENTICATE, 0);

        for (i = 0; i < 4; i++) {
                if (!params->wep_key[i])
                        continue;
                wpa_driver_nl80211_set_key(bss->ifname, priv, WPA_ALG_WEP,
                                           NULL, i,
                                           i == params->wep_tx_keyidx, NULL, 0,
                                           params->wep_key[i],
                                           params->wep_key_len[i]);
                if (params->wep_tx_keyidx != i)
                        continue;
                if (nl_add_key(msg, WPA_ALG_WEP, i, 1, NULL, 0,
                               params->wep_key[i], params->wep_key_len[i])) {
                        nlmsg_free(msg);
                        return -1;
                }
        }

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        if (params->bssid) {
                wpa_printf(MSG_DEBUG, "  * bssid=" MACSTR,
                           MAC2STR(params->bssid));
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, params->bssid);
        }
        if (params->freq) {
                wpa_printf(MSG_DEBUG, "  * freq=%d", params->freq);
                NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);
        }
        if (params->ssid) {
                wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
                                  params->ssid, params->ssid_len);
                NLA_PUT(msg, NL80211_ATTR_SSID, params->ssid_len,
                        params->ssid);
        }
        wpa_hexdump(MSG_DEBUG, "  * IEs", params->ie, params->ie_len);
        if (params->ie)
                NLA_PUT(msg, NL80211_ATTR_IE, params->ie_len, params->ie);
        /*
         * TODO: if multiple auth_alg options enabled, try them one by one if
         * the AP rejects authentication due to unknown auth alg
         */
        if (params->auth_alg & WPA_AUTH_ALG_OPEN)
                type = NL80211_AUTHTYPE_OPEN_SYSTEM;
        else if (params->auth_alg & WPA_AUTH_ALG_SHARED)
                type = NL80211_AUTHTYPE_SHARED_KEY;
        else if (params->auth_alg & WPA_AUTH_ALG_LEAP)
                type = NL80211_AUTHTYPE_NETWORK_EAP;
        else if (params->auth_alg & WPA_AUTH_ALG_FT)
                type = NL80211_AUTHTYPE_FT;
        else
                goto nla_put_failure;
        wpa_printf(MSG_DEBUG, "  * Auth Type %d", type);
        NLA_PUT_U32(msg, NL80211_ATTR_AUTH_TYPE, type);
        if (params->local_state_change) {
                wpa_printf(MSG_DEBUG, "  * Local state change only");
                NLA_PUT_FLAG(msg, NL80211_ATTR_LOCAL_STATE_CHANGE);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: MLME command failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                count++;
                if (ret == -EALREADY && count == 1 && params->bssid &&
                    !params->local_state_change) {
                        /*
                         * mac80211 does not currently accept new
                         * authentication if we are already authenticated. As a
                         * workaround, force deauthentication and try again.
                         */
                        wpa_printf(MSG_DEBUG, "nl80211: Retry authentication "
                                   "after forced deauthentication");
                        wpa_driver_nl80211_deauthenticate(
                                bss, params->bssid,
                                WLAN_REASON_PREV_AUTH_NOT_VALID);
                        nlmsg_free(msg);
                        goto retry;
                }
                goto nla_put_failure;
        }
        ret = 0;
        wpa_printf(MSG_DEBUG, "nl80211: Authentication request send "
                   "successfully");

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


struct phy_info_arg {
        u16 *num_modes;
        struct hostapd_hw_modes *modes;
};

static int phy_info_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb_msg[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct phy_info_arg *phy_info = arg;

        struct nlattr *tb_band[NL80211_BAND_ATTR_MAX + 1];

        struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
        static struct nla_policy freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
                [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
                [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG },
                [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
                [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
                [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG },
                [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 },
        };

        struct nlattr *tb_rate[NL80211_BITRATE_ATTR_MAX + 1];
        static struct nla_policy rate_policy[NL80211_BITRATE_ATTR_MAX + 1] = {
                [NL80211_BITRATE_ATTR_RATE] = { .type = NLA_U32 },
                [NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE] = { .type = NLA_FLAG },
        };

        struct nlattr *nl_band;
        struct nlattr *nl_freq;
        struct nlattr *nl_rate;
        int rem_band, rem_freq, rem_rate;
        struct hostapd_hw_modes *mode;
        int idx, mode_is_set;

        nla_parse(tb_msg, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        if (!tb_msg[NL80211_ATTR_WIPHY_BANDS])
                return NL_SKIP;

        nla_for_each_nested(nl_band, tb_msg[NL80211_ATTR_WIPHY_BANDS], rem_band) {
                mode = os_realloc(phy_info->modes, (*phy_info->num_modes + 1) * sizeof(*mode));
                if (!mode)
                        return NL_SKIP;
                phy_info->modes = mode;

                mode_is_set = 0;

                mode = &phy_info->modes[*(phy_info->num_modes)];
                memset(mode, 0, sizeof(*mode));
                *(phy_info->num_modes) += 1;

                nla_parse(tb_band, NL80211_BAND_ATTR_MAX, nla_data(nl_band),
                          nla_len(nl_band), NULL);

                if (tb_band[NL80211_BAND_ATTR_HT_CAPA]) {
                        mode->ht_capab = nla_get_u16(
                                tb_band[NL80211_BAND_ATTR_HT_CAPA]);
                }

                if (tb_band[NL80211_BAND_ATTR_HT_AMPDU_FACTOR]) {
                        mode->a_mpdu_params |= nla_get_u8(
                                tb_band[NL80211_BAND_ATTR_HT_AMPDU_FACTOR]) &
                                0x03;
                }

                if (tb_band[NL80211_BAND_ATTR_HT_AMPDU_DENSITY]) {
                        mode->a_mpdu_params |= nla_get_u8(
                                tb_band[NL80211_BAND_ATTR_HT_AMPDU_DENSITY]) <<
                                2;
                }

                if (tb_band[NL80211_BAND_ATTR_HT_MCS_SET] &&
                    nla_len(tb_band[NL80211_BAND_ATTR_HT_MCS_SET])) {
                        u8 *mcs;
                        mcs = nla_data(tb_band[NL80211_BAND_ATTR_HT_MCS_SET]);
                        os_memcpy(mode->mcs_set, mcs, 16);
                }

                nla_for_each_nested(nl_freq, tb_band[NL80211_BAND_ATTR_FREQS], rem_freq) {
                        nla_parse(tb_freq, NL80211_FREQUENCY_ATTR_MAX, nla_data(nl_freq),
                                  nla_len(nl_freq), freq_policy);
                        if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ])
                                continue;
                        mode->num_channels++;
                }

                mode->channels = os_zalloc(mode->num_channels * sizeof(struct hostapd_channel_data));
                if (!mode->channels)
                        return NL_SKIP;

                idx = 0;

                nla_for_each_nested(nl_freq, tb_band[NL80211_BAND_ATTR_FREQS], rem_freq) {
                        nla_parse(tb_freq, NL80211_FREQUENCY_ATTR_MAX, nla_data(nl_freq),
                                  nla_len(nl_freq), freq_policy);
                        if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ])
                                continue;

                        mode->channels[idx].freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
                        mode->channels[idx].flag = 0;

                        if (!mode_is_set) {
                                /* crude heuristic */
                                if (mode->channels[idx].freq < 4000)
                                        mode->mode = HOSTAPD_MODE_IEEE80211B;
                                else
                                        mode->mode = HOSTAPD_MODE_IEEE80211A;
                                mode_is_set = 1;
                        }

                        /* crude heuristic */
                        if (mode->channels[idx].freq < 4000)
                                if (mode->channels[idx].freq == 2484)
                                        mode->channels[idx].chan = 14;
                                else
                                        mode->channels[idx].chan = (mode->channels[idx].freq - 2407) / 5;
                        else
                                mode->channels[idx].chan = mode->channels[idx].freq/5 - 1000;

                        if (tb_freq[NL80211_FREQUENCY_ATTR_DISABLED])
                                mode->channels[idx].flag |=
                                        HOSTAPD_CHAN_DISABLED;
                        if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
                                mode->channels[idx].flag |=
                                        HOSTAPD_CHAN_PASSIVE_SCAN;
                        if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
                                mode->channels[idx].flag |=
                                        HOSTAPD_CHAN_NO_IBSS;
                        if (tb_freq[NL80211_FREQUENCY_ATTR_RADAR])
                                mode->channels[idx].flag |=
                                        HOSTAPD_CHAN_RADAR;

                        if (tb_freq[NL80211_FREQUENCY_ATTR_MAX_TX_POWER] &&
                            !tb_freq[NL80211_FREQUENCY_ATTR_DISABLED])
                                mode->channels[idx].max_tx_power =
                                        nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_MAX_TX_POWER]) / 100;

                        idx++;
                }

                nla_for_each_nested(nl_rate, tb_band[NL80211_BAND_ATTR_RATES], rem_rate) {
                        nla_parse(tb_rate, NL80211_BITRATE_ATTR_MAX, nla_data(nl_rate),
                                  nla_len(nl_rate), rate_policy);
                        if (!tb_rate[NL80211_BITRATE_ATTR_RATE])
                                continue;
                        mode->num_rates++;
                }

                mode->rates = os_zalloc(mode->num_rates * sizeof(int));
                if (!mode->rates)
                        return NL_SKIP;

                idx = 0;

                nla_for_each_nested(nl_rate, tb_band[NL80211_BAND_ATTR_RATES], rem_rate) {
                        nla_parse(tb_rate, NL80211_BITRATE_ATTR_MAX, nla_data(nl_rate),
                                  nla_len(nl_rate), rate_policy);
                        if (!tb_rate[NL80211_BITRATE_ATTR_RATE])
                                continue;
                        mode->rates[idx] = nla_get_u32(tb_rate[NL80211_BITRATE_ATTR_RATE]);

                        /* crude heuristic */
                        if (mode->mode == HOSTAPD_MODE_IEEE80211B &&
                            mode->rates[idx] > 200)
                                mode->mode = HOSTAPD_MODE_IEEE80211G;

                        idx++;
                }
        }

        return NL_SKIP;
}

static struct hostapd_hw_modes *
wpa_driver_nl80211_add_11b(struct hostapd_hw_modes *modes, u16 *num_modes)
{
        u16 m;
        struct hostapd_hw_modes *mode11g = NULL, *nmodes, *mode;
        int i, mode11g_idx = -1;

        /* If only 802.11g mode is included, use it to construct matching
         * 802.11b mode data. */

        for (m = 0; m < *num_modes; m++) {
                if (modes[m].mode == HOSTAPD_MODE_IEEE80211B)
                        return modes; /* 802.11b already included */
                if (modes[m].mode == HOSTAPD_MODE_IEEE80211G)
                        mode11g_idx = m;
        }

        if (mode11g_idx < 0)
                return modes; /* 2.4 GHz band not supported at all */

        nmodes = os_realloc(modes, (*num_modes + 1) * sizeof(*nmodes));
        if (nmodes == NULL)
                return modes; /* Could not add 802.11b mode */

        mode = &nmodes[*num_modes];
        os_memset(mode, 0, sizeof(*mode));
        (*num_modes)++;
        modes = nmodes;

        mode->mode = HOSTAPD_MODE_IEEE80211B;

        mode11g = &modes[mode11g_idx];
        mode->num_channels = mode11g->num_channels;
        mode->channels = os_malloc(mode11g->num_channels *
                                   sizeof(struct hostapd_channel_data));
        if (mode->channels == NULL) {
                (*num_modes)--;
                return modes; /* Could not add 802.11b mode */
        }
        os_memcpy(mode->channels, mode11g->channels,
                  mode11g->num_channels * sizeof(struct hostapd_channel_data));

        mode->num_rates = 0;
        mode->rates = os_malloc(4 * sizeof(int));
        if (mode->rates == NULL) {
                os_free(mode->channels);
                (*num_modes)--;
                return modes; /* Could not add 802.11b mode */
        }

        for (i = 0; i < mode11g->num_rates; i++) {
                if (mode11g->rates[i] != 10 && mode11g->rates[i] != 20 &&
                    mode11g->rates[i] != 55 && mode11g->rates[i] != 110)
                        continue;
                mode->rates[mode->num_rates] = mode11g->rates[i];
                mode->num_rates++;
                if (mode->num_rates == 4)
                        break;
        }

        if (mode->num_rates == 0) {
                os_free(mode->channels);
                os_free(mode->rates);
                (*num_modes)--;
                return modes; /* No 802.11b rates */
        }

        wpa_printf(MSG_DEBUG, "nl80211: Added 802.11b mode based on 802.11g "
                   "information");

        return modes;
}


static struct hostapd_hw_modes *
wpa_driver_nl80211_get_hw_feature_data(void *priv, u16 *num_modes, u16 *flags)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        struct phy_info_arg result = {
                .num_modes = num_modes,
                .modes = NULL,
        };

        *num_modes = 0;
        *flags = 0;

        msg = nlmsg_alloc();
        if (!msg)
                return NULL;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_GET_WIPHY, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);

        if (send_and_recv_msgs(drv, msg, phy_info_handler, &result) == 0)
                return wpa_driver_nl80211_add_11b(result.modes, num_modes);
 nla_put_failure:
        return NULL;
}


static int wpa_driver_nl80211_send_frame(struct wpa_driver_nl80211_data *drv,
                                         const void *data, size_t len,
                                         int encrypt)
{
        __u8 rtap_hdr[] = {
                0x00, 0x00, /* radiotap version */
                0x0e, 0x00, /* radiotap length */
                0x02, 0xc0, 0x00, 0x00, /* bmap: flags, tx and rx flags */
                IEEE80211_RADIOTAP_F_FRAG, /* F_FRAG (fragment if required) */
                0x00,       /* padding */
                0x00, 0x00, /* RX and TX flags to indicate that */
                0x00, 0x00, /* this is the injected frame directly */
        };
        struct iovec iov[2] = {
                {
                        .iov_base = &rtap_hdr,
                        .iov_len = sizeof(rtap_hdr),
                },
                {
                        .iov_base = (void *) data,
                        .iov_len = len,
                }
        };
        struct msghdr msg = {
                .msg_name = NULL,
                .msg_namelen = 0,
                .msg_iov = iov,
                .msg_iovlen = 2,
                .msg_control = NULL,
                .msg_controllen = 0,
                .msg_flags = 0,
        };

        if (encrypt)
                rtap_hdr[8] |= IEEE80211_RADIOTAP_F_WEP;

        return sendmsg(drv->monitor_sock, &msg, 0);
}


static int wpa_driver_nl80211_send_mlme(void *priv, const u8 *data,
                                        size_t data_len)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct ieee80211_mgmt *mgmt;
        int encrypt = 1;
        u16 fc;

        mgmt = (struct ieee80211_mgmt *) data;
        fc = le_to_host16(mgmt->frame_control);

        if (WLAN_FC_GET_TYPE(fc) == WLAN_FC_TYPE_MGMT &&
            WLAN_FC_GET_STYPE(fc) == WLAN_FC_STYPE_AUTH) {
                /*
                 * Only one of the authentication frame types is encrypted.
                 * In order for static WEP encryption to work properly (i.e.,
                 * to not encrypt the frame), we need to tell mac80211 about
                 * the frames that must not be encrypted.
                 */
                u16 auth_alg = le_to_host16(mgmt->u.auth.auth_alg);
                u16 auth_trans = le_to_host16(mgmt->u.auth.auth_transaction);
                if (auth_alg != WLAN_AUTH_SHARED_KEY || auth_trans != 3)
                        encrypt = 0;
        }

        return wpa_driver_nl80211_send_frame(drv, data, data_len, encrypt);
}


static int wpa_driver_nl80211_set_beacon(void *priv,
                                         const u8 *head, size_t head_len,
                                         const u8 *tail, size_t tail_len,
                                         int dtim_period, int beacon_int)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        u8 cmd = NL80211_CMD_NEW_BEACON;
        int ret;
        int beacon_set;
        int ifindex = if_nametoindex(bss->ifname);

        beacon_set = bss->beacon_set;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        wpa_printf(MSG_DEBUG, "nl80211: Set beacon (beacon_set=%d)",
                   beacon_set);
        if (beacon_set)
                cmd = NL80211_CMD_SET_BEACON;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, cmd, 0);
        NLA_PUT(msg, NL80211_ATTR_BEACON_HEAD, head_len, head);
        NLA_PUT(msg, NL80211_ATTR_BEACON_TAIL, tail_len, tail);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_BEACON_INTERVAL, beacon_int);
        NLA_PUT_U32(msg, NL80211_ATTR_DTIM_PERIOD, dtim_period);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Beacon set failed: %d (%s)",
                           ret, strerror(-ret));
        } else {
                bss->beacon_set = 1;
        }
        return ret;
 nla_put_failure:
        return -ENOBUFS;
}


static int wpa_driver_nl80211_set_freq(struct wpa_driver_nl80211_data *drv,
                                       int freq, int ht_enabled,
                                       int sec_channel_offset)
{
        struct nl_msg *msg;
        int ret;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_SET_WIPHY, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
        if (ht_enabled) {
                switch (sec_channel_offset) {
                case -1:
                        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
                                    NL80211_CHAN_HT40MINUS);
                        break;
                case 1:
                        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
                                    NL80211_CHAN_HT40PLUS);
                        break;
                default:
                        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
                                    NL80211_CHAN_HT20);
                        break;
                }
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret == 0)
                return 0;
        wpa_printf(MSG_DEBUG, "nl80211: Failed to set channel (freq=%d): "
                   "%d (%s)", freq, ret, strerror(-ret));
nla_put_failure:
        return -1;
}


static int wpa_driver_nl80211_sta_add(void *priv,
                                      struct hostapd_sta_add_params *params)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret = -ENOBUFS;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_NEW_STATION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(bss->ifname));
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, params->addr);
        NLA_PUT_U16(msg, NL80211_ATTR_STA_AID, params->aid);
        NLA_PUT(msg, NL80211_ATTR_STA_SUPPORTED_RATES, params->supp_rates_len,
                params->supp_rates);
        NLA_PUT_U16(msg, NL80211_ATTR_STA_LISTEN_INTERVAL,
                    params->listen_interval);
        if (params->ht_capabilities) {
                NLA_PUT(msg, NL80211_ATTR_HT_CAPABILITY,
                        sizeof(*params->ht_capabilities),
                        params->ht_capabilities);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret)
                wpa_printf(MSG_DEBUG, "nl80211: NL80211_CMD_NEW_STATION "
                           "result: %d (%s)", ret, strerror(-ret));
        if (ret == -EEXIST)
                ret = 0;
 nla_put_failure:
        return ret;
}


static int wpa_driver_nl80211_sta_remove(void *priv, const u8 *addr)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_DEL_STATION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX,
                    if_nametoindex(bss->ifname));
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret == -ENOENT)
                return 0;
        return ret;
 nla_put_failure:
        return -ENOBUFS;
}


static void nl80211_remove_iface(struct wpa_driver_nl80211_data *drv,
                                 int ifidx)
{
        struct nl_msg *msg;

        wpa_printf(MSG_DEBUG, "nl80211: Remove interface ifindex=%d", ifidx);

#ifdef HOSTAPD
        /* stop listening for EAPOL on this interface */
        del_ifidx(drv, ifidx);
#endif /* HOSTAPD */

        msg = nlmsg_alloc();
        if (!msg)
                goto nla_put_failure;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_DEL_INTERFACE, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifidx);

        if (send_and_recv_msgs(drv, msg, NULL, NULL) == 0)
                return;
 nla_put_failure:
        wpa_printf(MSG_ERROR, "Failed to remove interface (ifidx=%d)", ifidx);
}


static int nl80211_create_iface_once(struct wpa_driver_nl80211_data *drv,
                                     const char *ifname,
                                     enum nl80211_iftype iftype,
                                     const u8 *addr, int wds)
{
        struct nl_msg *msg, *flags = NULL;
        int ifidx;
        int ret = -ENOBUFS;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_NEW_INTERFACE, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, ifname);
        NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, iftype);

        if (iftype == NL80211_IFTYPE_MONITOR) {
                int err;

                flags = nlmsg_alloc();
                if (!flags)
                        goto nla_put_failure;

                NLA_PUT_FLAG(flags, NL80211_MNTR_FLAG_COOK_FRAMES);

                err = nla_put_nested(msg, NL80211_ATTR_MNTR_FLAGS, flags);

                nlmsg_free(flags);

                if (err)
                        goto nla_put_failure;
        } else if (wds) {
                NLA_PUT_U8(msg, NL80211_ATTR_4ADDR, wds);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret) {
 nla_put_failure:
                wpa_printf(MSG_ERROR, "Failed to create interface %s: %d (%s)",
                           ifname, ret, strerror(-ret));
                return ret;
        }

        ifidx = if_nametoindex(ifname);
        wpa_printf(MSG_DEBUG, "nl80211: New interface %s created: ifindex=%d",
                   ifname, ifidx);

        if (ifidx <= 0)
                return -1;

#ifdef HOSTAPD
        /* start listening for EAPOL on this interface */
        add_ifidx(drv, ifidx);
#endif /* HOSTAPD */

        if (addr && iftype != NL80211_IFTYPE_MONITOR &&
            linux_set_ifhwaddr(drv->ioctl_sock, ifname, addr)) {
                nl80211_remove_iface(drv, ifidx);
                return -1;
        }

        return ifidx;
}


static int nl80211_create_iface(struct wpa_driver_nl80211_data *drv,
                                const char *ifname, enum nl80211_iftype iftype,
                                const u8 *addr, int wds)
{
        int ret;

        ret = nl80211_create_iface_once(drv, ifname, iftype, addr, wds);

        /* if error occured and interface exists already */
        if (ret == -ENFILE && if_nametoindex(ifname)) {
                wpa_printf(MSG_INFO, "Try to remove and re-create %s", ifname);

                /* Try to remove the interface that was already there. */
                nl80211_remove_iface(drv, if_nametoindex(ifname));

                /* Try to create the interface again */
                ret = nl80211_create_iface_once(drv, ifname, iftype, addr,
                                                wds);
        }

        if (ret >= 0 && drv->disable_11b_rates)
                nl80211_disable_11b_rates(drv, ret, 1);

        return ret;
}


static void handle_tx_callback(void *ctx, u8 *buf, size_t len, int ok)
{
        struct ieee80211_hdr *hdr;
        u16 fc;
        union wpa_event_data event;

        hdr = (struct ieee80211_hdr *) buf;
        fc = le_to_host16(hdr->frame_control);

        os_memset(&event, 0, sizeof(event));
        event.tx_status.type = WLAN_FC_GET_TYPE(fc);
        event.tx_status.stype = WLAN_FC_GET_STYPE(fc);
        event.tx_status.dst = hdr->addr1;
        event.tx_status.data = buf;
        event.tx_status.data_len = len;
        event.tx_status.ack = ok;
        wpa_supplicant_event(ctx, EVENT_TX_STATUS, &event);
}


static void from_unknown_sta(struct wpa_driver_nl80211_data *drv,
                             u8 *buf, size_t len)
{
        union wpa_event_data event;
        os_memset(&event, 0, sizeof(event));
        event.rx_from_unknown.frame = buf;
        event.rx_from_unknown.len = len;
        wpa_supplicant_event(drv->ctx, EVENT_RX_FROM_UNKNOWN, &event);
}


static void handle_frame(struct wpa_driver_nl80211_data *drv,
                         u8 *buf, size_t len, int datarate, int ssi_signal)
{
        struct ieee80211_hdr *hdr;
        u16 fc;
        union wpa_event_data event;

        hdr = (struct ieee80211_hdr *) buf;
        fc = le_to_host16(hdr->frame_control);

        switch (WLAN_FC_GET_TYPE(fc)) {
        case WLAN_FC_TYPE_MGMT:
                os_memset(&event, 0, sizeof(event));
                event.rx_mgmt.frame = buf;
                event.rx_mgmt.frame_len = len;
                event.rx_mgmt.datarate = datarate;
                event.rx_mgmt.ssi_signal = ssi_signal;
                wpa_supplicant_event(drv->ctx, EVENT_RX_MGMT, &event);
                break;
        case WLAN_FC_TYPE_CTRL:
                /* can only get here with PS-Poll frames */
                wpa_printf(MSG_DEBUG, "CTRL");
                from_unknown_sta(drv, buf, len);
                break;
        case WLAN_FC_TYPE_DATA:
                from_unknown_sta(drv, buf, len);
                break;
        }
}


static void handle_monitor_read(int sock, void *eloop_ctx, void *sock_ctx)
{
        struct wpa_driver_nl80211_data *drv = eloop_ctx;
        int len;
        unsigned char buf[3000];
        struct ieee80211_radiotap_iterator iter;
        int ret;
        int datarate = 0, ssi_signal = 0;
        int injected = 0, failed = 0, rxflags = 0;

        len = recv(sock, buf, sizeof(buf), 0);
        if (len < 0) {
                perror("recv");
                return;
        }

        if (drv->nlmode == NL80211_IFTYPE_STATION && !drv->probe_req_report) {
                wpa_printf(MSG_DEBUG, "nl80211: Ignore monitor interface "
                           "frame since Probe Request reporting is disabled");
                return;
        }

        if (ieee80211_radiotap_iterator_init(&iter, (void*)buf, len)) {
                printf("received invalid radiotap frame\n");
                return;
        }

        while (1) {
                ret = ieee80211_radiotap_iterator_next(&iter);
                if (ret == -ENOENT)
                        break;
                if (ret) {
                        printf("received invalid radiotap frame (%d)\n", ret);
                        return;
                }
                switch (iter.this_arg_index) {
                case IEEE80211_RADIOTAP_FLAGS:
                        if (*iter.this_arg & IEEE80211_RADIOTAP_F_FCS)
                                len -= 4;
                        break;
                case IEEE80211_RADIOTAP_RX_FLAGS:
                        rxflags = 1;
                        break;
                case IEEE80211_RADIOTAP_TX_FLAGS:
                        injected = 1;
                        failed = le_to_host16((*(uint16_t *) iter.this_arg)) &
                                        IEEE80211_RADIOTAP_F_TX_FAIL;
                        break;
                case IEEE80211_RADIOTAP_DATA_RETRIES:
                        break;
                case IEEE80211_RADIOTAP_CHANNEL:
                        /* TODO: convert from freq/flags to channel number */
                        break;
                case IEEE80211_RADIOTAP_RATE:
                        datarate = *iter.this_arg * 5;
                        break;
                case IEEE80211_RADIOTAP_DB_ANTSIGNAL:
                        ssi_signal = *iter.this_arg;
                        break;
                }
        }

        if (rxflags && injected)
                return;

        if (!injected)
                handle_frame(drv, buf + iter.max_length,
                             len - iter.max_length, datarate, ssi_signal);
        else
                handle_tx_callback(drv->ctx, buf + iter.max_length,
                                   len - iter.max_length, !failed);
}


/*
 * we post-process the filter code later and rewrite
 * this to the offset to the last instruction
 */
#define PASS    0xFF
#define FAIL    0xFE

static struct sock_filter msock_filter_insns[] = {
        /*
         * do a little-endian load of the radiotap length field
         */
        /* load lower byte into A */
        BPF_STMT(BPF_LD  | BPF_B | BPF_ABS, 2),
        /* put it into X (== index register) */
        BPF_STMT(BPF_MISC| BPF_TAX, 0),
        /* load upper byte into A */
        BPF_STMT(BPF_LD  | BPF_B | BPF_ABS, 3),
        /* left-shift it by 8 */
        BPF_STMT(BPF_ALU | BPF_LSH | BPF_K, 8),
        /* or with X */
        BPF_STMT(BPF_ALU | BPF_OR | BPF_X, 0),
        /* put result into X */
        BPF_STMT(BPF_MISC| BPF_TAX, 0),

        /*
         * Allow management frames through, this also gives us those
         * management frames that we sent ourselves with status
         */
        /* load the lower byte of the IEEE 802.11 frame control field */
        BPF_STMT(BPF_LD  | BPF_B | BPF_IND, 0),
        /* mask off frame type and version */
        BPF_STMT(BPF_ALU | BPF_AND | BPF_K, 0xF),
        /* accept frame if it's both 0, fall through otherwise */
        BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0, PASS, 0),

        /*
         * TODO: add a bit to radiotap RX flags that indicates
         * that the sending station is not associated, then
         * add a filter here that filters on our DA and that flag
         * to allow us to deauth frames to that bad station.
         *
         * Not a regression -- we didn't do it before either.
         */

#if 0
        /*
         * drop non-data frames
         */
        /* load the lower byte of the frame control field */
        BPF_STMT(BPF_LD   | BPF_B | BPF_IND, 0),
        /* mask off QoS bit */
        BPF_STMT(BPF_ALU  | BPF_AND | BPF_K, 0x0c),
        /* drop non-data frames */
        BPF_JUMP(BPF_JMP  | BPF_JEQ | BPF_K, 8, 0, FAIL),
#endif
        /* load the upper byte of the frame control field */
        BPF_STMT(BPF_LD   | BPF_B | BPF_IND, 1),
        /* mask off toDS/fromDS */
        BPF_STMT(BPF_ALU  | BPF_AND | BPF_K, 0x03),
        /* accept WDS frames */
        BPF_JUMP(BPF_JMP  | BPF_JEQ | BPF_K, 3, PASS, 0),

        /*
         * add header length to index
         */
        /* load the lower byte of the frame control field */
        BPF_STMT(BPF_LD   | BPF_B | BPF_IND, 0),
        /* mask off QoS bit */
        BPF_STMT(BPF_ALU  | BPF_AND | BPF_K, 0x80),
        /* right shift it by 6 to give 0 or 2 */
        BPF_STMT(BPF_ALU  | BPF_RSH | BPF_K, 6),
        /* add data frame header length */
        BPF_STMT(BPF_ALU  | BPF_ADD | BPF_K, 24),
        /* add index, was start of 802.11 header */
        BPF_STMT(BPF_ALU  | BPF_ADD | BPF_X, 0),
        /* move to index, now start of LL header */
        BPF_STMT(BPF_MISC | BPF_TAX, 0),

        /*
         * Accept empty data frames, we use those for
         * polling activity.
         */
        BPF_STMT(BPF_LD  | BPF_W | BPF_LEN, 0),
        BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_X, 0, PASS, 0),

        /*
         * Accept EAPOL frames
         */
        BPF_STMT(BPF_LD  | BPF_W | BPF_IND, 0),
        BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0xAAAA0300, 0, FAIL),
        BPF_STMT(BPF_LD  | BPF_W | BPF_IND, 4),
        BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, 0x0000888E, PASS, FAIL),

        /* keep these last two statements or change the code below */
        /* return 0 == "DROP" */
        BPF_STMT(BPF_RET | BPF_K, 0),
        /* return ~0 == "keep all" */
        BPF_STMT(BPF_RET | BPF_K, ~0),
};

static struct sock_fprog msock_filter = {
        .len = sizeof(msock_filter_insns)/sizeof(msock_filter_insns[0]),
        .filter = msock_filter_insns,
};


static int add_monitor_filter(int s)
{
        int idx;

        /* rewrite all PASS/FAIL jump offsets */
        for (idx = 0; idx < msock_filter.len; idx++) {
                struct sock_filter *insn = &msock_filter_insns[idx];

                if (BPF_CLASS(insn->code) == BPF_JMP) {
                        if (insn->code == (BPF_JMP|BPF_JA)) {
                                if (insn->k == PASS)
                                        insn->k = msock_filter.len - idx - 2;
                                else if (insn->k == FAIL)
                                        insn->k = msock_filter.len - idx - 3;
                        }

                        if (insn->jt == PASS)
                                insn->jt = msock_filter.len - idx - 2;
                        else if (insn->jt == FAIL)
                                insn->jt = msock_filter.len - idx - 3;

                        if (insn->jf == PASS)
                                insn->jf = msock_filter.len - idx - 2;
                        else if (insn->jf == FAIL)
                                insn->jf = msock_filter.len - idx - 3;
                }
        }

        if (setsockopt(s, SOL_SOCKET, SO_ATTACH_FILTER,
                       &msock_filter, sizeof(msock_filter))) {
                perror("SO_ATTACH_FILTER");
                return -1;
        }

        return 0;
}


static void nl80211_remove_monitor_interface(
        struct wpa_driver_nl80211_data *drv)
{
        if (drv->monitor_ifidx >= 0) {
                nl80211_remove_iface(drv, drv->monitor_ifidx);
                drv->monitor_ifidx = -1;
        }
        if (drv->monitor_sock >= 0) {
                eloop_unregister_read_sock(drv->monitor_sock);
                close(drv->monitor_sock);
                drv->monitor_sock = -1;
        }
}


static int
nl80211_create_monitor_interface(struct wpa_driver_nl80211_data *drv)
{
        char buf[IFNAMSIZ];
        struct sockaddr_ll ll;
        int optval;
        socklen_t optlen;

        snprintf(buf, IFNAMSIZ, "mon.%s", drv->first_bss.ifname);
        buf[IFNAMSIZ - 1] = '\0';

        drv->monitor_ifidx =
                nl80211_create_iface(drv, buf, NL80211_IFTYPE_MONITOR, NULL,
                                     0);

        if (drv->monitor_ifidx < 0)
                return -1;

        if (linux_set_iface_flags(drv->ioctl_sock, buf, 1))
                goto error;

        memset(&ll, 0, sizeof(ll));
        ll.sll_family = AF_PACKET;
        ll.sll_ifindex = drv->monitor_ifidx;
        drv->monitor_sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
        if (drv->monitor_sock < 0) {
                perror("socket[PF_PACKET,SOCK_RAW]");
                goto error;
        }

        if (add_monitor_filter(drv->monitor_sock)) {
                wpa_printf(MSG_INFO, "Failed to set socket filter for monitor "
                           "interface; do filtering in user space");
                /* This works, but will cost in performance. */
        }

        if (bind(drv->monitor_sock, (struct sockaddr *) &ll, sizeof(ll)) < 0) {
                perror("monitor socket bind");
                goto error;
        }

        optlen = sizeof(optval);
        optval = 20;
        if (setsockopt
            (drv->monitor_sock, SOL_SOCKET, SO_PRIORITY, &optval, optlen)) {
                perror("Failed to set socket priority");
                goto error;
        }

        if (eloop_register_read_sock(drv->monitor_sock, handle_monitor_read,
                                     drv, NULL)) {
                printf("Could not register monitor read socket\n");
                goto error;
        }

        return 0;
 error:
        nl80211_remove_monitor_interface(drv);
        return -1;
}


static const u8 rfc1042_header[6] = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };

static int wpa_driver_nl80211_hapd_send_eapol(
        void *priv, const u8 *addr, const u8 *data,
        size_t data_len, int encrypt, const u8 *own_addr)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct ieee80211_hdr *hdr;
        size_t len;
        u8 *pos;
        int res;
#if 0 /* FIX */
        int qos = sta->flags & WPA_STA_WMM;
#else
        int qos = 0;
#endif

        len = sizeof(*hdr) + (qos ? 2 : 0) + sizeof(rfc1042_header) + 2 +
                data_len;
        hdr = os_zalloc(len);
        if (hdr == NULL) {
                printf("malloc() failed for i802_send_data(len=%lu)\n",
                       (unsigned long) len);
                return -1;
        }

        hdr->frame_control =
                IEEE80211_FC(WLAN_FC_TYPE_DATA, WLAN_FC_STYPE_DATA);
        hdr->frame_control |= host_to_le16(WLAN_FC_FROMDS);
        if (encrypt)
                hdr->frame_control |= host_to_le16(WLAN_FC_ISWEP);
#if 0 /* To be enabled if qos determination is added above */
        if (qos) {
                hdr->frame_control |=
                        host_to_le16(WLAN_FC_STYPE_QOS_DATA << 4);
        }
#endif

        memcpy(hdr->IEEE80211_DA_FROMDS, addr, ETH_ALEN);
        memcpy(hdr->IEEE80211_BSSID_FROMDS, own_addr, ETH_ALEN);
        memcpy(hdr->IEEE80211_SA_FROMDS, own_addr, ETH_ALEN);
        pos = (u8 *) (hdr + 1);

#if 0 /* To be enabled if qos determination is added above */
        if (qos) {
                /* add an empty QoS header if needed */
                pos[0] = 0;
                pos[1] = 0;
                pos += 2;
        }
#endif

        memcpy(pos, rfc1042_header, sizeof(rfc1042_header));
        pos += sizeof(rfc1042_header);
        WPA_PUT_BE16(pos, ETH_P_PAE);
        pos += 2;
        memcpy(pos, data, data_len);

        res = wpa_driver_nl80211_send_frame(drv, (u8 *) hdr, len, encrypt);
        if (res < 0) {
                wpa_printf(MSG_ERROR, "i802_send_eapol - packet len: %lu - "
                           "failed: %d (%s)",
                           (unsigned long) len, errno, strerror(errno));
        }
        os_free(hdr);

        return res;
}


static u32 sta_flags_nl80211(int flags)
{
        u32 f = 0;

        if (flags & WPA_STA_AUTHORIZED)
                f |= BIT(NL80211_STA_FLAG_AUTHORIZED);
        if (flags & WPA_STA_WMM)
                f |= BIT(NL80211_STA_FLAG_WME);
        if (flags & WPA_STA_SHORT_PREAMBLE)
                f |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
        if (flags & WPA_STA_MFP)
                f |= BIT(NL80211_STA_FLAG_MFP);

        return f;
}


static int wpa_driver_nl80211_sta_set_flags(void *priv, const u8 *addr,
                                            int total_flags,
                                            int flags_or, int flags_and)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg, *flags = NULL;
        struct nl80211_sta_flag_update upd;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        flags = nlmsg_alloc();
        if (!flags) {
                nlmsg_free(msg);
                return -ENOMEM;
        }

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_STATION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX,
                    if_nametoindex(bss->ifname));
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);

        /*
         * Backwards compatibility version using NL80211_ATTR_STA_FLAGS. This
         * can be removed eventually.
         */
        if (total_flags & WPA_STA_AUTHORIZED)
                NLA_PUT_FLAG(flags, NL80211_STA_FLAG_AUTHORIZED);

        if (total_flags & WPA_STA_WMM)
                NLA_PUT_FLAG(flags, NL80211_STA_FLAG_WME);

        if (total_flags & WPA_STA_SHORT_PREAMBLE)
                NLA_PUT_FLAG(flags, NL80211_STA_FLAG_SHORT_PREAMBLE);

        if (total_flags & WPA_STA_MFP)
                NLA_PUT_FLAG(flags, NL80211_STA_FLAG_MFP);

        if (nla_put_nested(msg, NL80211_ATTR_STA_FLAGS, flags))
                goto nla_put_failure;

        os_memset(&upd, 0, sizeof(upd));
        upd.mask = sta_flags_nl80211(flags_or | ~flags_and);
        upd.set = sta_flags_nl80211(flags_or);
        NLA_PUT(msg, NL80211_ATTR_STA_FLAGS2, sizeof(upd), &upd);

        nlmsg_free(flags);

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        nlmsg_free(flags);
        return -ENOBUFS;
}


static int wpa_driver_nl80211_ap(struct wpa_driver_nl80211_data *drv,
                                 struct wpa_driver_associate_params *params)
{
        if (wpa_driver_nl80211_set_mode(&drv->first_bss, params->mode) ||
            wpa_driver_nl80211_set_freq(drv, params->freq, 0, 0)) {
                nl80211_remove_monitor_interface(drv);
                return -1;
        }

        /* TODO: setup monitor interface (and add code somewhere to remove this
         * when AP mode is stopped; associate with mode != 2 or drv_deinit) */

        return 0;
}


static int nl80211_leave_ibss(struct wpa_driver_nl80211_data *drv)
{
        struct nl_msg *msg;
        int ret = -1;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_LEAVE_IBSS, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Leave IBSS failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                goto nla_put_failure;
        }

        ret = 0;
        wpa_printf(MSG_DEBUG, "nl80211: Leave IBSS request sent successfully");

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int wpa_driver_nl80211_ibss(struct wpa_driver_nl80211_data *drv,
                                   struct wpa_driver_associate_params *params)
{
        struct nl_msg *msg;
        int ret = -1;
        int count = 0;

        wpa_printf(MSG_DEBUG, "nl80211: Join IBSS (ifindex=%d)", drv->ifindex);

        if (wpa_driver_nl80211_set_mode(&drv->first_bss, params->mode)) {
                wpa_printf(MSG_INFO, "nl80211: Failed to set interface into "
                           "IBSS mode");
                return -1;
        }

retry:
        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_JOIN_IBSS, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);

        if (params->ssid == NULL || params->ssid_len > sizeof(drv->ssid))
                goto nla_put_failure;

        wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
                          params->ssid, params->ssid_len);
        NLA_PUT(msg, NL80211_ATTR_SSID, params->ssid_len,
                params->ssid);
        os_memcpy(drv->ssid, params->ssid, params->ssid_len);
        drv->ssid_len = params->ssid_len;

        wpa_printf(MSG_DEBUG, "  * freq=%d", params->freq);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);

        ret = nl80211_set_conn_keys(params, msg);
        if (ret)
                goto nla_put_failure;

        if (params->wpa_ie) {
                wpa_hexdump(MSG_DEBUG,
                            "  * Extra IEs for Beacon/Probe Response frames",
                            params->wpa_ie, params->wpa_ie_len);
                NLA_PUT(msg, NL80211_ATTR_IE, params->wpa_ie_len,
                        params->wpa_ie);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Join IBSS failed: ret=%d (%s)",
                           ret, strerror(-ret));
                count++;
                if (ret == -EALREADY && count == 1) {
                        wpa_printf(MSG_DEBUG, "nl80211: Retry IBSS join after "
                                   "forced leave");
                        nl80211_leave_ibss(drv);
                        nlmsg_free(msg);
                        goto retry;
                }

                goto nla_put_failure;
        }
        ret = 0;
        wpa_printf(MSG_DEBUG, "nl80211: Join IBSS request sent successfully");

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int wpa_driver_nl80211_connect(
        struct wpa_driver_nl80211_data *drv,
        struct wpa_driver_associate_params *params)
{
        struct nl_msg *msg;
        enum nl80211_auth_type type;
        int ret = 0;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        wpa_printf(MSG_DEBUG, "nl80211: Connect (ifindex=%d)", drv->ifindex);
        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_CONNECT, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        if (params->bssid) {
                wpa_printf(MSG_DEBUG, "  * bssid=" MACSTR,
                           MAC2STR(params->bssid));
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, params->bssid);
        }
        if (params->freq) {
                wpa_printf(MSG_DEBUG, "  * freq=%d", params->freq);
                NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);
        }
        if (params->ssid) {
                wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
                                  params->ssid, params->ssid_len);
                NLA_PUT(msg, NL80211_ATTR_SSID, params->ssid_len,
                        params->ssid);
                if (params->ssid_len > sizeof(drv->ssid))
                        goto nla_put_failure;
                os_memcpy(drv->ssid, params->ssid, params->ssid_len);
                drv->ssid_len = params->ssid_len;
        }
        wpa_hexdump(MSG_DEBUG, "  * IEs", params->wpa_ie, params->wpa_ie_len);
        if (params->wpa_ie)
                NLA_PUT(msg, NL80211_ATTR_IE, params->wpa_ie_len,
                        params->wpa_ie);

        if (params->auth_alg & WPA_AUTH_ALG_OPEN)
                type = NL80211_AUTHTYPE_OPEN_SYSTEM;
        else if (params->auth_alg & WPA_AUTH_ALG_SHARED)
                type = NL80211_AUTHTYPE_SHARED_KEY;
        else if (params->auth_alg & WPA_AUTH_ALG_LEAP)
                type = NL80211_AUTHTYPE_NETWORK_EAP;
        else if (params->auth_alg & WPA_AUTH_ALG_FT)
                type = NL80211_AUTHTYPE_FT;
        else
                goto nla_put_failure;

        wpa_printf(MSG_DEBUG, "  * Auth Type %d", type);
        NLA_PUT_U32(msg, NL80211_ATTR_AUTH_TYPE, type);

        if (params->wpa_ie && params->wpa_ie_len) {
                enum nl80211_wpa_versions ver;

                if (params->wpa_ie[0] == WLAN_EID_RSN)
                        ver = NL80211_WPA_VERSION_2;
                else
                        ver = NL80211_WPA_VERSION_1;

                wpa_printf(MSG_DEBUG, "  * WPA Version %d", ver);
                NLA_PUT_U32(msg, NL80211_ATTR_WPA_VERSIONS, ver);
        }

        if (params->pairwise_suite != CIPHER_NONE) {
                int cipher;

                switch (params->pairwise_suite) {
                case CIPHER_WEP40:
                        cipher = WLAN_CIPHER_SUITE_WEP40;
                        break;
                case CIPHER_WEP104:
                        cipher = WLAN_CIPHER_SUITE_WEP104;
                        break;
                case CIPHER_CCMP:
                        cipher = WLAN_CIPHER_SUITE_CCMP;
                        break;
                case CIPHER_TKIP:
                default:
                        cipher = WLAN_CIPHER_SUITE_TKIP;
                        break;
                }
                NLA_PUT_U32(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE, cipher);
        }

        if (params->group_suite != CIPHER_NONE) {
                int cipher;

                switch (params->group_suite) {
                case CIPHER_WEP40:
                        cipher = WLAN_CIPHER_SUITE_WEP40;
                        break;
                case CIPHER_WEP104:
                        cipher = WLAN_CIPHER_SUITE_WEP104;
                        break;
                case CIPHER_CCMP:
                        cipher = WLAN_CIPHER_SUITE_CCMP;
                        break;
                case CIPHER_TKIP:
                default:
                        cipher = WLAN_CIPHER_SUITE_TKIP;
                        break;
                }
                NLA_PUT_U32(msg, NL80211_ATTR_CIPHER_SUITE_GROUP, cipher);
        }

        if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
            params->key_mgmt_suite == KEY_MGMT_PSK) {
                int mgmt = WLAN_AKM_SUITE_PSK;

                switch (params->key_mgmt_suite) {
                case KEY_MGMT_802_1X:
                        mgmt = WLAN_AKM_SUITE_8021X;
                        break;
                case KEY_MGMT_PSK:
                default:
                        mgmt = WLAN_AKM_SUITE_PSK;
                        break;
                }
                NLA_PUT_U32(msg, NL80211_ATTR_AKM_SUITES, mgmt);
        }

        ret = nl80211_set_conn_keys(params, msg);
        if (ret)
                goto nla_put_failure;

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: MLME connect failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                goto nla_put_failure;
        }
        ret = 0;
        wpa_printf(MSG_DEBUG, "nl80211: Connect request send successfully");

nla_put_failure:
        nlmsg_free(msg);
        return ret;

}


static int wpa_driver_nl80211_associate(
        void *priv, struct wpa_driver_associate_params *params)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret = -1;
        struct nl_msg *msg;

        if (params->mode == IEEE80211_MODE_AP)
                return wpa_driver_nl80211_ap(drv, params);

        if (params->mode == IEEE80211_MODE_IBSS)
                return wpa_driver_nl80211_ibss(drv, params);

        if (!(drv->capa.flags & WPA_DRIVER_FLAGS_SME)) {
                if (wpa_driver_nl80211_set_mode(priv, params->mode) < 0)
                        return -1;
                return wpa_driver_nl80211_connect(drv, params);
        }

        drv->associated = 0;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        wpa_printf(MSG_DEBUG, "nl80211: Associate (ifindex=%d)",
                   drv->ifindex);
        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_ASSOCIATE, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        if (params->bssid) {
                wpa_printf(MSG_DEBUG, "  * bssid=" MACSTR,
                           MAC2STR(params->bssid));
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, params->bssid);
        }
        if (params->freq) {
                wpa_printf(MSG_DEBUG, "  * freq=%d", params->freq);
                NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);
                drv->assoc_freq = params->freq;
        } else
                drv->assoc_freq = 0;
        if (params->ssid) {
                wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
                                  params->ssid, params->ssid_len);
                NLA_PUT(msg, NL80211_ATTR_SSID, params->ssid_len,
                        params->ssid);
                if (params->ssid_len > sizeof(drv->ssid))
                        goto nla_put_failure;
                os_memcpy(drv->ssid, params->ssid, params->ssid_len);
                drv->ssid_len = params->ssid_len;
        }
        wpa_hexdump(MSG_DEBUG, "  * IEs", params->wpa_ie, params->wpa_ie_len);
        if (params->wpa_ie)
                NLA_PUT(msg, NL80211_ATTR_IE, params->wpa_ie_len,
                        params->wpa_ie);

#ifdef CONFIG_IEEE80211W
        if (params->mgmt_frame_protection == MGMT_FRAME_PROTECTION_REQUIRED)
                NLA_PUT_U32(msg, NL80211_ATTR_USE_MFP, NL80211_MFP_REQUIRED);
#endif /* CONFIG_IEEE80211W */

        NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT);

        if (params->prev_bssid) {
                wpa_printf(MSG_DEBUG, "  * prev_bssid=" MACSTR,
                           MAC2STR(params->prev_bssid));
                NLA_PUT(msg, NL80211_ATTR_PREV_BSSID, ETH_ALEN,
                        params->prev_bssid);
        }

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: MLME command failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                nl80211_dump_scan(drv);
                goto nla_put_failure;
        }
        ret = 0;
        wpa_printf(MSG_DEBUG, "nl80211: Association request send "
                   "successfully");

nla_put_failure:
        nlmsg_free(msg);
        return ret;
}


static int nl80211_set_mode(struct wpa_driver_nl80211_data *drv,
                            int ifindex, int mode)
{
        struct nl_msg *msg;
        int ret = -ENOBUFS;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_INTERFACE, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, mode);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (!ret)
                return 0;
nla_put_failure:
        wpa_printf(MSG_DEBUG, "nl80211: Failed to set interface %d to mode %d:"
                   " %d (%s)", ifindex, mode, ret, strerror(-ret));
        return ret;
}


static int wpa_driver_nl80211_set_mode(void *priv, int mode)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret = -1;
        int nlmode;

        switch (mode) {
        case 0:
                nlmode = NL80211_IFTYPE_STATION;
                break;
        case 1:
                nlmode = NL80211_IFTYPE_ADHOC;
                break;
        case 2:
                nlmode = NL80211_IFTYPE_AP;
                break;
        default:
                return -1;
        }

        if (nl80211_set_mode(drv, drv->ifindex, nlmode) == 0) {
                drv->nlmode = nlmode;
                ret = 0;
                goto done;
        }

        if (nlmode == drv->nlmode) {
                wpa_printf(MSG_DEBUG, "nl80211: Interface already in "
                           "requested mode - ignore error");
                ret = 0;
                goto done; /* Already in the requested mode */
        }

        /* mac80211 doesn't allow mode changes while the device is up, so
         * take the device down, try to set the mode again, and bring the
         * device back up.
         */
        if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 0) == 0) {
                /* Try to set the mode again while the interface is down */
                ret = nl80211_set_mode(drv, drv->ifindex, nlmode);
                if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 1))
                        ret = -1;
        }

        if (!ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Mode change succeeded while "
                           "interface is down");
                drv->nlmode = nlmode;
        }

done:
        if (!ret && nlmode == NL80211_IFTYPE_AP) {
                /* Setup additional AP mode functionality if needed */
                if (drv->monitor_ifidx < 0 &&
                    nl80211_create_monitor_interface(drv))
                        return -1;
        } else if (!ret && nlmode != NL80211_IFTYPE_AP) {
                /* Remove additional AP mode functionality */
                nl80211_remove_monitor_interface(drv);
                bss->beacon_set = 0;
        }

        if (ret)
                wpa_printf(MSG_DEBUG, "nl80211: Interface mode change to %d "
                           "from %d failed", nlmode, drv->nlmode);

        return ret;
}


static int wpa_driver_nl80211_get_capa(void *priv,
                                       struct wpa_driver_capa *capa)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (!drv->has_capability)
                return -1;
        os_memcpy(capa, &drv->capa, sizeof(*capa));
        return 0;
}


static int wpa_driver_nl80211_set_operstate(void *priv, int state)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;

        wpa_printf(MSG_DEBUG, "%s: operstate %d->%d (%s)",
                   __func__, drv->operstate, state, state ? "UP" : "DORMANT");
        drv->operstate = state;
        return netlink_send_oper_ifla(drv->netlink, drv->ifindex, -1,
                                      state ? IF_OPER_UP : IF_OPER_DORMANT);
}


static int wpa_driver_nl80211_set_supp_port(void *priv, int authorized)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        struct nl80211_sta_flag_update upd;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_STATION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX,
                    if_nametoindex(bss->ifname));
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, drv->bssid);

        os_memset(&upd, 0, sizeof(upd));
        upd.mask = BIT(NL80211_STA_FLAG_AUTHORIZED);
        if (authorized)
                upd.set = BIT(NL80211_STA_FLAG_AUTHORIZED);
        NLA_PUT(msg, NL80211_ATTR_STA_FLAGS2, sizeof(upd), &upd);

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        return -ENOBUFS;
}


#ifdef HOSTAPD

static void add_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx)
{
        int i;
        int *old;

        wpa_printf(MSG_DEBUG, "nl80211: Add own interface ifindex %d",
                   ifidx);
        for (i = 0; i < drv->num_if_indices; i++) {
                if (drv->if_indices[i] == 0) {
                        drv->if_indices[i] = ifidx;
                        return;
                }
        }

        if (drv->if_indices != drv->default_if_indices)
                old = drv->if_indices;
        else
                old = NULL;

        drv->if_indices = os_realloc(old,
                                     sizeof(int) * (drv->num_if_indices + 1));
        if (!drv->if_indices) {
                if (!old)
                        drv->if_indices = drv->default_if_indices;
                else
                        drv->if_indices = old;
                wpa_printf(MSG_ERROR, "Failed to reallocate memory for "
                           "interfaces");
                wpa_printf(MSG_ERROR, "Ignoring EAPOL on interface %d", ifidx);
                return;
        } else if (!old)
                os_memcpy(drv->if_indices, drv->default_if_indices,
                          sizeof(drv->default_if_indices));
        drv->if_indices[drv->num_if_indices] = ifidx;
        drv->num_if_indices++;
}


static void del_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx)
{
        int i;

        for (i = 0; i < drv->num_if_indices; i++) {
                if (drv->if_indices[i] == ifidx) {
                        drv->if_indices[i] = 0;
                        break;
                }
        }
}


static int have_ifidx(struct wpa_driver_nl80211_data *drv, int ifidx)
{
        int i;

        for (i = 0; i < drv->num_if_indices; i++)
                if (drv->if_indices[i] == ifidx)
                        return 1;

        return 0;
}


static inline int min_int(int a, int b)
{
        if (a < b)
                return a;
        return b;
}


static int get_key_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        /*
         * TODO: validate the key index and mac address!
         * Otherwise, there's a race condition as soon as
         * the kernel starts sending key notifications.
         */

        if (tb[NL80211_ATTR_KEY_SEQ])
                memcpy(arg, nla_data(tb[NL80211_ATTR_KEY_SEQ]),
                       min_int(nla_len(tb[NL80211_ATTR_KEY_SEQ]), 6));
        return NL_SKIP;
}


static int i802_get_seqnum(const char *iface, void *priv, const u8 *addr,
                           int idx, u8 *seq)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_GET_KEY, 0);

        if (addr)
                NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
        NLA_PUT_U8(msg, NL80211_ATTR_KEY_IDX, idx);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(iface));

        memset(seq, 0, 6);

        return send_and_recv_msgs(drv, msg, get_key_handler, seq);
 nla_put_failure:
        return -ENOBUFS;
}


static int i802_set_rate_sets(void *priv, int *supp_rates, int *basic_rates,
                              int mode)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        u8 rates[NL80211_MAX_SUPP_RATES];
        u8 rates_len = 0;
        int i;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_SET_BSS, 0);

        for (i = 0; i < NL80211_MAX_SUPP_RATES && basic_rates[i] >= 0; i++)
                rates[rates_len++] = basic_rates[i] / 5;

        NLA_PUT(msg, NL80211_ATTR_BSS_BASIC_RATES, rates_len, rates);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(bss->ifname));

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        return -ENOBUFS;
}

#endif /* HOSTAPD */


/* Set kernel driver on given frequency (MHz) */
static int i802_set_freq(void *priv, struct hostapd_freq_params *freq)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        return wpa_driver_nl80211_set_freq(drv, freq->freq, freq->ht_enabled,
                                           freq->sec_channel_offset);
}


#ifdef HOSTAPD

static int i802_set_rts(void *priv, int rts)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret = -ENOBUFS;
        u32 val;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        if (rts >= 2347)
                val = (u32) -1;
        else
                val = rts;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_WIPHY, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RTS_THRESHOLD, val);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (!ret)
                return 0;
nla_put_failure:
        wpa_printf(MSG_DEBUG, "nl80211: Failed to set RTS threshold %d: "
                   "%d (%s)", rts, ret, strerror(-ret));
        return ret;
}


static int i802_set_frag(void *priv, int frag)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret = -ENOBUFS;
        u32 val;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        if (frag >= 2346)
                val = (u32) -1;
        else
                val = frag;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_WIPHY, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FRAG_THRESHOLD, val);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (!ret)
                return 0;
nla_put_failure:
        wpa_printf(MSG_DEBUG, "nl80211: Failed to set fragmentation threshold "
                   "%d: %d (%s)", frag, ret, strerror(-ret));
        return ret;
}


static int i802_flush(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_DEL_STATION, 0);

        /*
         * XXX: FIX! this needs to flush all VLANs too
         */
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX,
                    if_nametoindex(bss->ifname));

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        return -ENOBUFS;
}


static int get_sta_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        struct hostap_sta_driver_data *data = arg;
        struct nlattr *stats[NL80211_STA_INFO_MAX + 1];
        static struct nla_policy stats_policy[NL80211_STA_INFO_MAX + 1] = {
                [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 },
                [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 },
                [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 },
                [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 },
                [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 },
        };

        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);

        /*
         * TODO: validate the interface and mac address!
         * Otherwise, there's a race condition as soon as
         * the kernel starts sending station notifications.
         */

        if (!tb[NL80211_ATTR_STA_INFO]) {
                wpa_printf(MSG_DEBUG, "sta stats missing!");
                return NL_SKIP;
        }
        if (nla_parse_nested(stats, NL80211_STA_INFO_MAX,
                             tb[NL80211_ATTR_STA_INFO],
                             stats_policy)) {
                wpa_printf(MSG_DEBUG, "failed to parse nested attributes!");
                return NL_SKIP;
        }

        if (stats[NL80211_STA_INFO_INACTIVE_TIME])
                data->inactive_msec =
                        nla_get_u32(stats[NL80211_STA_INFO_INACTIVE_TIME]);
        if (stats[NL80211_STA_INFO_RX_BYTES])
                data->rx_bytes = nla_get_u32(stats[NL80211_STA_INFO_RX_BYTES]);
        if (stats[NL80211_STA_INFO_TX_BYTES])
                data->tx_bytes = nla_get_u32(stats[NL80211_STA_INFO_TX_BYTES]);
        if (stats[NL80211_STA_INFO_RX_PACKETS])
                data->rx_packets =
                        nla_get_u32(stats[NL80211_STA_INFO_RX_PACKETS]);
        if (stats[NL80211_STA_INFO_TX_PACKETS])
                data->tx_packets =
                        nla_get_u32(stats[NL80211_STA_INFO_TX_PACKETS]);

        return NL_SKIP;
}

static int i802_read_sta_data(void *priv, struct hostap_sta_driver_data *data,
                              const u8 *addr)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;

        os_memset(data, 0, sizeof(*data));
        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_GET_STATION, 0);

        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(bss->ifname));

        return send_and_recv_msgs(drv, msg, get_sta_handler, data);
 nla_put_failure:
        return -ENOBUFS;
}


static int i802_set_tx_queue_params(void *priv, int queue, int aifs,
                                    int cw_min, int cw_max, int burst_time)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        struct nlattr *txq, *params;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_WIPHY, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(bss->ifname));

        txq = nla_nest_start(msg, NL80211_ATTR_WIPHY_TXQ_PARAMS);
        if (!txq)
                goto nla_put_failure;

        /* We are only sending parameters for a single TXQ at a time */
        params = nla_nest_start(msg, 1);
        if (!params)
                goto nla_put_failure;

        NLA_PUT_U8(msg, NL80211_TXQ_ATTR_QUEUE, queue);
        /* Burst time is configured in units of 0.1 msec and TXOP parameter in
         * 32 usec, so need to convert the value here. */
        NLA_PUT_U16(msg, NL80211_TXQ_ATTR_TXOP, (burst_time * 100 + 16) / 32);
        NLA_PUT_U16(msg, NL80211_TXQ_ATTR_CWMIN, cw_min);
        NLA_PUT_U16(msg, NL80211_TXQ_ATTR_CWMAX, cw_max);
        NLA_PUT_U8(msg, NL80211_TXQ_ATTR_AIFS, aifs);

        nla_nest_end(msg, params);

        nla_nest_end(msg, txq);

        if (send_and_recv_msgs(drv, msg, NULL, NULL) == 0)
                return 0;
 nla_put_failure:
        return -1;
}


static int i802_set_bss(void *priv, int cts, int preamble, int slot)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_SET_BSS, 0);

        if (cts >= 0)
                NLA_PUT_U8(msg, NL80211_ATTR_BSS_CTS_PROT, cts);
        if (preamble >= 0)
                NLA_PUT_U8(msg, NL80211_ATTR_BSS_SHORT_PREAMBLE, preamble);
        if (slot >= 0)
                NLA_PUT_U8(msg, NL80211_ATTR_BSS_SHORT_SLOT_TIME, slot);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, if_nametoindex(bss->ifname));

        return send_and_recv_msgs(drv, msg, NULL, NULL);
 nla_put_failure:
        return -ENOBUFS;
}


static int i802_set_cts_protect(void *priv, int value)
{
        return i802_set_bss(priv, value, -1, -1);
}


static int i802_set_preamble(void *priv, int value)
{
        return i802_set_bss(priv, -1, value, -1);
}


static int i802_set_short_slot_time(void *priv, int value)
{
        return i802_set_bss(priv, -1, -1, value);
}


static int i802_set_sta_vlan(void *priv, const u8 *addr,
                             const char *ifname, int vlan_id)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret = -ENOBUFS;

        msg = nlmsg_alloc();
        if (!msg)
                return -ENOMEM;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_STATION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX,
                    if_nametoindex(bss->ifname));
        NLA_PUT(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
        NLA_PUT_U32(msg, NL80211_ATTR_STA_VLAN,
                    if_nametoindex(ifname));

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret < 0) {
                wpa_printf(MSG_ERROR, "nl80211: NL80211_ATTR_STA_VLAN (addr="
                           MACSTR " ifname=%s vlan_id=%d) failed: %d (%s)",
                           MAC2STR(addr), ifname, vlan_id, ret,
                           strerror(-ret));
        }
 nla_put_failure:
        return ret;
}


static int i802_set_wds_sta(void *priv, const u8 *addr, int aid, int val)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        char name[IFNAMSIZ + 1];

        os_snprintf(name, sizeof(name), "%s.sta%d", bss->ifname, aid);
        wpa_printf(MSG_DEBUG, "nl80211: Set WDS STA addr=" MACSTR
                   " aid=%d val=%d name=%s", MAC2STR(addr), aid, val, name);
        if (val) {
                if (nl80211_create_iface(drv, name, NL80211_IFTYPE_AP_VLAN,
                                         NULL, 1) < 0)
                        return -1;
                linux_set_iface_flags(drv->ioctl_sock, name, 1);
                return i802_set_sta_vlan(priv, addr, name, 0);
        } else {
                i802_set_sta_vlan(priv, addr, bss->ifname, 0);
                return wpa_driver_nl80211_if_remove(priv, WPA_IF_AP_VLAN,
                                                    name);
        }
}


static void handle_eapol(int sock, void *eloop_ctx, void *sock_ctx)
{
        struct wpa_driver_nl80211_data *drv = eloop_ctx;
        struct sockaddr_ll lladdr;
        unsigned char buf[3000];
        int len;
        socklen_t fromlen = sizeof(lladdr);

        len = recvfrom(sock, buf, sizeof(buf), 0,
                       (struct sockaddr *)&lladdr, &fromlen);
        if (len < 0) {
                perror("recv");
                return;
        }

        if (have_ifidx(drv, lladdr.sll_ifindex))
                drv_event_eapol_rx(drv->ctx, lladdr.sll_addr, buf, len);
}


static int i802_get_inact_sec(void *priv, const u8 *addr)
{
        struct hostap_sta_driver_data data;
        int ret;

        data.inactive_msec = (unsigned long) -1;
        ret = i802_read_sta_data(priv, &data, addr);
        if (ret || data.inactive_msec == (unsigned long) -1)
                return -1;
        return data.inactive_msec / 1000;
}


static int i802_sta_clear_stats(void *priv, const u8 *addr)
{
#if 0
        /* TODO */
#endif
        return 0;
}


static int i802_sta_deauth(void *priv, const u8 *own_addr, const u8 *addr,
                           int reason)
{
        struct i802_bss *bss = priv;
        struct ieee80211_mgmt mgmt;

        memset(&mgmt, 0, sizeof(mgmt));
        mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
                                          WLAN_FC_STYPE_DEAUTH);
        memcpy(mgmt.da, addr, ETH_ALEN);
        memcpy(mgmt.sa, own_addr, ETH_ALEN);
        memcpy(mgmt.bssid, own_addr, ETH_ALEN);
        mgmt.u.deauth.reason_code = host_to_le16(reason);
        return wpa_driver_nl80211_send_mlme(bss, (u8 *) &mgmt,
                                            IEEE80211_HDRLEN +
                                            sizeof(mgmt.u.deauth));
}


static int i802_sta_disassoc(void *priv, const u8 *own_addr, const u8 *addr,
                             int reason)
{
        struct i802_bss *bss = priv;
        struct ieee80211_mgmt mgmt;

        memset(&mgmt, 0, sizeof(mgmt));
        mgmt.frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
                                          WLAN_FC_STYPE_DISASSOC);
        memcpy(mgmt.da, addr, ETH_ALEN);
        memcpy(mgmt.sa, own_addr, ETH_ALEN);
        memcpy(mgmt.bssid, own_addr, ETH_ALEN);
        mgmt.u.disassoc.reason_code = host_to_le16(reason);
        return wpa_driver_nl80211_send_mlme(bss, (u8 *) &mgmt,
                                            IEEE80211_HDRLEN +
                                            sizeof(mgmt.u.disassoc));
}


static int i802_check_bridge(struct wpa_driver_nl80211_data *drv,
                             const char *brname, const char *ifname)
{
        int ifindex;
        char in_br[IFNAMSIZ];

        os_strlcpy(drv->brname, brname, IFNAMSIZ);
        ifindex = if_nametoindex(brname);
        if (ifindex == 0) {
                /*
                 * Bridge was configured, but the bridge device does
                 * not exist. Try to add it now.
                 */
                if (linux_br_add(drv->ioctl_sock, brname) < 0) {
                        wpa_printf(MSG_ERROR, "nl80211: Failed to add the "
                                   "bridge interface %s: %s",
                                   brname, strerror(errno));
                        return -1;
                }
                drv->added_bridge = 1;
                add_ifidx(drv, if_nametoindex(brname));
        }

        if (linux_br_get(in_br, ifname) == 0) {
                if (os_strcmp(in_br, brname) == 0)
                        return 0; /* already in the bridge */

                wpa_printf(MSG_DEBUG, "nl80211: Removing interface %s from "
                           "bridge %s", ifname, in_br);
                if (linux_br_del_if(drv->ioctl_sock, in_br, ifname) < 0) {
                        wpa_printf(MSG_ERROR, "nl80211: Failed to "
                                   "remove interface %s from bridge "
                                   "%s: %s",
                                   ifname, brname, strerror(errno));
                        return -1;
                }
        }

        wpa_printf(MSG_DEBUG, "nl80211: Adding interface %s into bridge %s",
                   ifname, brname);
        if (linux_br_add_if(drv->ioctl_sock, brname, ifname) < 0) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to add interface %s "
                           "into bridge %s: %s",
                           ifname, brname, strerror(errno));
                return -1;
        }
        drv->added_if_into_bridge = 1;

        return 0;
}


static void *i802_init(struct hostapd_data *hapd,
                       struct wpa_init_params *params)
{
        struct wpa_driver_nl80211_data *drv;
        struct i802_bss *bss;
        size_t i;
        char brname[IFNAMSIZ];
        int ifindex, br_ifindex;
        int br_added = 0;

        bss = wpa_driver_nl80211_init(hapd, params->ifname);
        if (bss == NULL)
                return NULL;

        drv = bss->drv;
        if (linux_br_get(brname, params->ifname) == 0) {
                wpa_printf(MSG_DEBUG, "nl80211: Interface %s is in bridge %s",
                           params->ifname, brname);
                br_ifindex = if_nametoindex(brname);
        } else {
                brname[0] = '\0';
                br_ifindex = 0;
        }

        drv->num_if_indices = sizeof(drv->default_if_indices) / sizeof(int);
        drv->if_indices = drv->default_if_indices;
        for (i = 0; i < params->num_bridge; i++) {
                if (params->bridge[i]) {
                        ifindex = if_nametoindex(params->bridge[i]);
                        if (ifindex)
                                add_ifidx(drv, ifindex);
                        if (ifindex == br_ifindex)
                                br_added = 1;
                }
        }
        if (!br_added && br_ifindex &&
            (params->num_bridge == 0 || !params->bridge[0]))
                add_ifidx(drv, br_ifindex);

        /* start listening for EAPOL on the default AP interface */
        add_ifidx(drv, drv->ifindex);

        if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 0))
                goto failed;

        if (params->bssid) {
                if (linux_set_ifhwaddr(drv->ioctl_sock, bss->ifname,
                                       params->bssid))
                        goto failed;
        }

        if (wpa_driver_nl80211_set_mode(bss, IEEE80211_MODE_AP)) {
                wpa_printf(MSG_ERROR, "nl80211: Failed to set interface %s "
                           "into AP mode", bss->ifname);
                goto failed;
        }

        if (params->num_bridge && params->bridge[0] &&
            i802_check_bridge(drv, params->bridge[0], params->ifname) < 0)
                goto failed;

        if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 1))
                goto failed;

        drv->eapol_sock = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_PAE));
        if (drv->eapol_sock < 0) {
                perror("socket(PF_PACKET, SOCK_DGRAM, ETH_P_PAE)");
                goto failed;
        }

        if (eloop_register_read_sock(drv->eapol_sock, handle_eapol, drv, NULL))
        {
                printf("Could not register read socket for eapol\n");
                goto failed;
        }

        if (linux_get_ifhwaddr(drv->ioctl_sock, bss->ifname, params->own_addr))
                goto failed;

        return bss;

failed:
        nl80211_remove_monitor_interface(drv);
        if (drv->ioctl_sock >= 0)
                close(drv->ioctl_sock);

        genl_family_put(drv->nl80211);
        nl_cache_free(drv->nl_cache);
        nl_handle_destroy(drv->nl_handle);
        nl_cb_put(drv->nl_cb);

        os_free(drv);
        return NULL;
}


static void i802_deinit(void *priv)
{
        wpa_driver_nl80211_deinit(priv);
}

#endif /* HOSTAPD */


static enum nl80211_iftype wpa_driver_nl80211_if_type(
        enum wpa_driver_if_type type)
{
        switch (type) {
        case WPA_IF_STATION:
                return NL80211_IFTYPE_STATION;
        case WPA_IF_AP_VLAN:
                return NL80211_IFTYPE_AP_VLAN;
        case WPA_IF_AP_BSS:
                return NL80211_IFTYPE_AP;
        }
        return -1;
}


static int wpa_driver_nl80211_if_add(void *priv, enum wpa_driver_if_type type,
                                     const char *ifname, const u8 *addr,
                                     void *bss_ctx, void **drv_priv,
                                     char *force_ifname, u8 *if_addr)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ifidx;
#ifdef HOSTAPD
        struct i802_bss *new_bss = NULL;

        if (type == WPA_IF_AP_BSS) {
                new_bss = os_zalloc(sizeof(*new_bss));
                if (new_bss == NULL)
                        return -1;
        }
#endif /* HOSTAPD */

        if (addr)
                os_memcpy(if_addr, addr, ETH_ALEN);
        ifidx = nl80211_create_iface(drv, ifname,
                                     wpa_driver_nl80211_if_type(type), addr,
                                     0);
        if (ifidx < 0) {
#ifdef HOSTAPD
                os_free(new_bss);
#endif /* HOSTAPD */
                return -1;
        }

        if (!addr &&
            linux_get_ifhwaddr(drv->ioctl_sock, bss->ifname, if_addr) < 0)
                return -1;

#ifdef HOSTAPD
        if (type == WPA_IF_AP_BSS) {
                if (linux_set_iface_flags(drv->ioctl_sock, ifname, 1)) {
                        nl80211_remove_iface(drv, ifidx);
                        os_free(new_bss);
                        return -1;
                }
                os_strlcpy(new_bss->ifname, ifname, IFNAMSIZ);
                new_bss->ifindex = ifidx;
                new_bss->drv = drv;
                new_bss->next = drv->first_bss.next;
                drv->first_bss.next = new_bss;
                if (drv_priv)
                        *drv_priv = new_bss;
        }
#endif /* HOSTAPD */

        return 0;
}


static int wpa_driver_nl80211_if_remove(void *priv,
                                        enum wpa_driver_if_type type,
                                        const char *ifname)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ifindex = if_nametoindex(ifname);

        wpa_printf(MSG_DEBUG, "nl80211: %s(type=%d ifname=%s) ifindex=%d",
                   __func__, type, ifname, ifindex);
        if (ifindex <= 0)
                return -1;
        nl80211_remove_iface(drv, ifindex);

#ifdef HOSTAPD
        if (type != WPA_IF_AP_BSS)
                return 0;

        if (bss != &drv->first_bss) {
                struct i802_bss *tbss = &drv->first_bss;

                while (tbss) {
                        if (tbss->next != bss)
                                continue;

                        tbss->next = bss->next;
                        os_free(bss);
                        break;
                }
        }
#endif /* HOSTAPD */

        return 0;
}


static int cookie_handler(struct nl_msg *msg, void *arg)
{
        struct nlattr *tb[NL80211_ATTR_MAX + 1];
        struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
        u64 *cookie = arg;
        nla_parse(tb, NL80211_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
                  genlmsg_attrlen(gnlh, 0), NULL);
        if (tb[NL80211_ATTR_COOKIE])
                *cookie = nla_get_u64(tb[NL80211_ATTR_COOKIE]);
        return NL_SKIP;
}


static int wpa_driver_nl80211_send_action(void *priv, unsigned int freq,
                                          const u8 *dst, const u8 *src,
                                          const u8 *bssid,
                                          const u8 *data, size_t data_len)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret = -1;
        struct nl_msg *msg;
        u8 *buf;
        struct ieee80211_hdr *hdr;
        u64 cookie;

        wpa_printf(MSG_DEBUG, "nl80211: Send Action frame (ifindex=%d)",
                   drv->ifindex);

        buf = os_zalloc(24 + data_len);
        if (buf == NULL)
                return ret;
        os_memcpy(buf + 24, data, data_len);
        hdr = (struct ieee80211_hdr *) buf;
        hdr->frame_control =
                IEEE80211_FC(WLAN_FC_TYPE_MGMT, WLAN_FC_STYPE_ACTION);
        os_memcpy(hdr->addr1, dst, ETH_ALEN);
        os_memcpy(hdr->addr2, src, ETH_ALEN);
        os_memcpy(hdr->addr3, bssid, ETH_ALEN);

        if (drv->nlmode == NL80211_IFTYPE_AP) {
                ret = wpa_driver_nl80211_send_mlme(priv, buf, 24 + data_len);
                os_free(buf);
                return ret;
        }

        msg = nlmsg_alloc();
        if (!msg) {
                os_free(buf);
                return -1;
        }

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_ACTION, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
        NLA_PUT(msg, NL80211_ATTR_FRAME, 24 + data_len, buf);
        os_free(buf);
        buf = NULL;

        cookie = 0;
        ret = send_and_recv_msgs(drv, msg, cookie_handler, &cookie);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Action command failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
                goto nla_put_failure;
        }
        wpa_printf(MSG_DEBUG, "nl80211: Action TX command accepted; "
                   "cookie 0x%llx", (long long unsigned int) cookie);
        drv->send_action_cookie = cookie;
        drv->pending_send_action = 1;
        ret = 0;

nla_put_failure:
        os_free(buf);
        nlmsg_free(msg);
        return ret;
}


static int wpa_driver_nl80211_remain_on_channel(void *priv, unsigned int freq,
                                                unsigned int duration)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret;
        u64 cookie;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_REMAIN_ON_CHANNEL, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
        NLA_PUT_U32(msg, NL80211_ATTR_DURATION, duration);

        cookie = 0;
        ret = send_and_recv_msgs(drv, msg, cookie_handler, &cookie);
        if (ret == 0) {
                wpa_printf(MSG_DEBUG, "nl80211: Remain-on-channel cookie "
                           "0x%llx for freq=%u MHz duration=%u",
                           (long long unsigned int) cookie, freq, duration);
                drv->remain_on_chan_cookie = cookie;
                return 0;
        }
        wpa_printf(MSG_DEBUG, "nl80211: Failed to request remain-on-channel "
                   "(freq=%d): %d (%s)", freq, ret, strerror(-ret));
nla_put_failure:
        return -1;
}


static int wpa_driver_nl80211_cancel_remain_on_channel(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg;
        int ret;

        if (!drv->pending_remain_on_chan) {
                wpa_printf(MSG_DEBUG, "nl80211: No pending remain-on-channel "
                           "to cancel");
                return -1;
        }

        wpa_printf(MSG_DEBUG, "nl80211: Cancel remain-on-channel with cookie "
                   "0x%llx",
                   (long long unsigned int) drv->remain_on_chan_cookie);

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
        NLA_PUT_U64(msg, NL80211_ATTR_COOKIE, drv->remain_on_chan_cookie);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        if (ret == 0)
                return 0;
        wpa_printf(MSG_DEBUG, "nl80211: Failed to cancel remain-on-channel: "
                   "%d (%s)", ret, strerror(-ret));
nla_put_failure:
        return -1;
}


static void wpa_driver_nl80211_probe_req_report_timeout(void *eloop_ctx,
                                                        void *timeout_ctx)
{
        struct wpa_driver_nl80211_data *drv = eloop_ctx;
        if (drv->monitor_ifidx < 0)
                return; /* monitor interface already removed */

        if (drv->nlmode != NL80211_IFTYPE_STATION)
                return; /* not in station mode anymore */

        if (drv->probe_req_report)
                return; /* reporting enabled */

        wpa_printf(MSG_DEBUG, "nl80211: Remove monitor interface due to no "
                   "Probe Request reporting needed anymore");
        nl80211_remove_monitor_interface(drv);
}


static int wpa_driver_nl80211_probe_req_report(void *priv, int report)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;

        if (drv->nlmode != NL80211_IFTYPE_STATION) {
                wpa_printf(MSG_DEBUG, "nl80211: probe_req_report control only "
                           "allowed in station mode (iftype=%d)",
                           drv->nlmode);
                return -1;
        }
        drv->probe_req_report = report;

        if (report) {
                eloop_cancel_timeout(
                        wpa_driver_nl80211_probe_req_report_timeout,
                        drv, NULL);
                if (drv->monitor_ifidx < 0 &&
                    nl80211_create_monitor_interface(drv))
                        return -1;
        } else {
                /*
                 * It takes a while to remove the monitor interface, so try to
                 * avoid doing this if it is needed again shortly. Instead,
                 * schedule the interface to be removed later if no need for it
                 * is seen.
                 */
                wpa_printf(MSG_DEBUG, "nl80211: Scheduling monitor interface "
                           "to be removed after 10 seconds of no use");
                eloop_register_timeout(
                        10, 0, wpa_driver_nl80211_probe_req_report_timeout,
                        drv, NULL);
        }

        return 0;
}


static int nl80211_disable_11b_rates(struct wpa_driver_nl80211_data *drv,
                                     int ifindex, int disabled)
{
        struct nl_msg *msg;
        struct nlattr *bands, *band;
        int ret;

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0, 0,
                    NL80211_CMD_SET_TX_BITRATE_MASK, 0);
        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, ifindex);

        bands = nla_nest_start(msg, NL80211_ATTR_TX_RATES);
        if (!bands)
                goto nla_put_failure;

        /*
         * Disable 2 GHz rates 1, 2, 5.5, 11 Mbps by masking out everything
         * else apart from 6, 9, 12, 18, 24, 36, 48, 54 Mbps from non-MCS
         * rates. All 5 GHz rates are left enabled.
         */
        band = nla_nest_start(msg, NL80211_BAND_2GHZ);
        if (!band)
                goto nla_put_failure;
        NLA_PUT(msg, NL80211_TXRATE_LEGACY, 8,
                "\x0c\x12\x18\x24\x30\x48\x60\x6c");
        nla_nest_end(msg, band);

        nla_nest_end(msg, bands);

        ret = send_and_recv_msgs(drv, msg, NULL, NULL);
        msg = NULL;
        if (ret) {
                wpa_printf(MSG_DEBUG, "nl80211: Set TX rates failed: ret=%d "
                           "(%s)", ret, strerror(-ret));
        }

        return ret;

nla_put_failure:
        nlmsg_free(msg);
        return -1;
}


static int wpa_driver_nl80211_disable_11b_rates(void *priv, int disabled)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        drv->disable_11b_rates = disabled;
        return nl80211_disable_11b_rates(drv, drv->ifindex, disabled);
}


static int wpa_driver_nl80211_deinit_ap(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (drv->nlmode != NL80211_IFTYPE_AP)
                return -1;
        wpa_driver_nl80211_del_beacon(drv);
        return wpa_driver_nl80211_set_mode(priv, IEEE80211_MODE_INFRA);
}


static void wpa_driver_nl80211_resume(void *priv)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        if (linux_set_iface_flags(drv->ioctl_sock, bss->ifname, 1)) {
                wpa_printf(MSG_DEBUG, "nl80211: Failed to set interface up on "
                           "resume event");
        }
}


static int nl80211_send_ft_action(void *priv, u8 action, const u8 *target_ap,
                                  const u8 *ies, size_t ies_len)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        int ret;
        u8 *data, *pos;
        size_t data_len;
        u8 own_addr[ETH_ALEN];

        if (linux_get_ifhwaddr(drv->ioctl_sock, bss->ifname, own_addr) < 0)
                return -1;

        if (action != 1) {
                wpa_printf(MSG_ERROR, "nl80211: Unsupported send_ft_action "
                           "action %d", action);
                return -1;
        }

        /*
         * Action frame payload:
         * Category[1] = 6 (Fast BSS Transition)
         * Action[1] = 1 (Fast BSS Transition Request)
         * STA Address
         * Target AP Address
         * FT IEs
         */

        data_len = 2 + 2 * ETH_ALEN + ies_len;
        data = os_malloc(data_len);
        if (data == NULL)
                return -1;
        pos = data;
        *pos++ = 0x06; /* FT Action category */
        *pos++ = action;
        os_memcpy(pos, own_addr, ETH_ALEN);
        pos += ETH_ALEN;
        os_memcpy(pos, target_ap, ETH_ALEN);
        pos += ETH_ALEN;
        os_memcpy(pos, ies, ies_len);

        ret = wpa_driver_nl80211_send_action(bss, drv->assoc_freq, drv->bssid,
                                             own_addr, drv->bssid,
                                             data, data_len);
        os_free(data);

        return ret;
}


static int nl80211_signal_monitor(void *priv, int threshold, int hysteresis)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        struct nl_msg *msg, *cqm = NULL;

        wpa_printf(MSG_DEBUG, "nl80211: Signal monitor threshold=%d "
                   "hysteresis=%d", threshold, hysteresis);

        msg = nlmsg_alloc();
        if (!msg)
                return -1;

        genlmsg_put(msg, 0, 0, genl_family_get_id(drv->nl80211), 0,
                    0, NL80211_CMD_SET_CQM, 0);

        NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, bss->ifindex);

        cqm = nlmsg_alloc();
        if (cqm == NULL)
                return -1;

        NLA_PUT_U32(cqm, NL80211_ATTR_CQM_RSSI_THOLD, threshold);
        NLA_PUT_U32(cqm, NL80211_ATTR_CQM_RSSI_HYST, hysteresis);
        nla_put_nested(msg, NL80211_ATTR_CQM, cqm);

        if (send_and_recv_msgs(drv, msg, NULL, NULL) == 0)
                return 0;
        msg = NULL;

nla_put_failure:
        if (cqm)
                nlmsg_free(cqm);
        nlmsg_free(msg);
        return -1;
}


static int nl80211_send_frame(void *priv, const u8 *data, size_t data_len,
                              int encrypt)
{
        struct i802_bss *bss = priv;
        struct wpa_driver_nl80211_data *drv = bss->drv;
        return wpa_driver_nl80211_send_frame(drv, data, data_len, encrypt);
}


const struct wpa_driver_ops wpa_driver_nl80211_ops = {
        .name = "nl80211",
        .desc = "Linux nl80211/cfg80211",
        .get_bssid = wpa_driver_nl80211_get_bssid,
        .get_ssid = wpa_driver_nl80211_get_ssid,
        .set_key = wpa_driver_nl80211_set_key,
        .scan2 = wpa_driver_nl80211_scan,
        .get_scan_results2 = wpa_driver_nl80211_get_scan_results,
        .deauthenticate = wpa_driver_nl80211_deauthenticate,
        .disassociate = wpa_driver_nl80211_disassociate,
        .authenticate = wpa_driver_nl80211_authenticate,
        .associate = wpa_driver_nl80211_associate,
        .init = wpa_driver_nl80211_init,
        .deinit = wpa_driver_nl80211_deinit,
        .get_capa = wpa_driver_nl80211_get_capa,
        .set_operstate = wpa_driver_nl80211_set_operstate,
        .set_supp_port = wpa_driver_nl80211_set_supp_port,
        .set_country = wpa_driver_nl80211_set_country,
        .set_beacon = wpa_driver_nl80211_set_beacon,
        .if_add = wpa_driver_nl80211_if_add,
        .if_remove = wpa_driver_nl80211_if_remove,
        .send_mlme = wpa_driver_nl80211_send_mlme,
        .get_hw_feature_data = wpa_driver_nl80211_get_hw_feature_data,
        .sta_add = wpa_driver_nl80211_sta_add,
        .sta_remove = wpa_driver_nl80211_sta_remove,
        .hapd_send_eapol = wpa_driver_nl80211_hapd_send_eapol,
        .sta_set_flags = wpa_driver_nl80211_sta_set_flags,
#ifdef HOSTAPD
        .hapd_init = i802_init,
        .hapd_deinit = i802_deinit,
        .get_seqnum = i802_get_seqnum,
        .flush = i802_flush,
        .read_sta_data = i802_read_sta_data,
        .sta_deauth = i802_sta_deauth,
        .sta_disassoc = i802_sta_disassoc,
        .get_inact_sec = i802_get_inact_sec,
        .sta_clear_stats = i802_sta_clear_stats,
        .set_rts = i802_set_rts,
        .set_frag = i802_set_frag,
        .set_rate_sets = i802_set_rate_sets,
        .set_cts_protect = i802_set_cts_protect,
        .set_preamble = i802_set_preamble,
        .set_short_slot_time = i802_set_short_slot_time,
        .set_tx_queue_params = i802_set_tx_queue_params,
        .set_sta_vlan = i802_set_sta_vlan,
        .set_wds_sta = i802_set_wds_sta,
#endif /* HOSTAPD */
        .set_freq = i802_set_freq,
        .send_action = wpa_driver_nl80211_send_action,
        .remain_on_channel = wpa_driver_nl80211_remain_on_channel,
        .cancel_remain_on_channel =
        wpa_driver_nl80211_cancel_remain_on_channel,
        .probe_req_report = wpa_driver_nl80211_probe_req_report,
        .disable_11b_rates = wpa_driver_nl80211_disable_11b_rates,
        .deinit_ap = wpa_driver_nl80211_deinit_ap,
        .resume = wpa_driver_nl80211_resume,
        .send_ft_action = nl80211_send_ft_action,
        .signal_monitor = nl80211_signal_monitor,
        .send_frame = nl80211_send_frame,
};

---

wpa_supplicant
Author(s): Package maintained by Blaise Gassend
autogenerated on Fri Jan 11 10:04:03 2013