path: root/bcmdhd/wifi_hal/wifi_hal.cpp

#include <stdint.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <linux/rtnetlink.h>
#include <netpacket/packet.h>
#include <linux/filter.h>
#include <linux/errqueue.h>
#include <errno.h>

#include <linux/pkt_sched.h>
#include <netlink/object-api.h>
#include <netlink/netlink.h>
#include <netlink/socket.h>
#include <netlink/attr.h>
#include <netlink/handlers.h>
#include <netlink/msg.h>

#include <dirent.h>
#include <net/if.h>

#include "sync.h"

#define LOG_TAG  "WifiHAL"

#include <utils/Log.h>

#include "wifi_hal.h"
#include "common.h"
#include "cpp_bindings.h"
#include "rtt.h"
/*
 BUGBUG: normally, libnl allocates ports for all connections it makes; but
 being a static library, it doesn't really know how many other netlink connections
 are made by the same process, if connections come from different shared libraries.
 These port assignments exist to solve that problem - temporarily. We need to fix
 libnl to try and allocate ports across the entire process.
 */

#define WIFI_HAL_CMD_SOCK_PORT       644
#define WIFI_HAL_EVENT_SOCK_PORT     645

#define FEATURE_SET                  0
#define FEATURE_SET_MATRIX           1
#define ATTR_NODFS_VALUE             3
#define ATTR_COUNTRY_CODE            4

static void internal_event_handler(wifi_handle handle, int events);
static int internal_no_seq_check(nl_msg *msg, void *arg);
static int internal_valid_message_handler(nl_msg *msg, void *arg);
static int wifi_get_multicast_id(wifi_handle handle, const char *name, const char *group);
static int wifi_add_membership(wifi_handle handle, const char *group);
static wifi_error wifi_init_interfaces(wifi_handle handle);
static wifi_error wifi_start_rssi_monitoring(wifi_request_id id, wifi_interface_handle
                        iface, s8 max_rssi, s8 min_rssi, wifi_rssi_event_handler eh);
static wifi_error wifi_stop_rssi_monitoring(wifi_request_id id, wifi_interface_handle iface);

typedef enum wifi_attr {
    ANDR_WIFI_ATTRIBUTE_NUM_FEATURE_SET,
    ANDR_WIFI_ATTRIBUTE_FEATURE_SET,
    ANDR_WIFI_ATTRIBUTE_PNO_RANDOM_MAC_OUI
} wifi_attr_t;

enum wifi_rssi_monitor_attr {
    RSSI_MONITOR_ATTRIBUTE_MAX_RSSI,
    RSSI_MONITOR_ATTRIBUTE_MIN_RSSI,
    RSSI_MONITOR_ATTRIBUTE_START,
};

/* Initialize/Cleanup */

void wifi_socket_set_local_port(struct nl_sock *sock, uint32_t port)
{
    uint32_t pid = getpid() & 0x3FFFFF;
    nl_socket_set_local_port(sock, pid + (port << 22));
}

static nl_sock * wifi_create_nl_socket(int port)
{
    // ALOGI("Creating socket");
    struct nl_sock *sock = nl_socket_alloc();
    if (sock == NULL) {
        ALOGE("Could not create handle");
        return NULL;
    }

    wifi_socket_set_local_port(sock, port);

    struct sockaddr *addr = NULL;
    // ALOGI("sizeof(sockaddr) = %d, sizeof(sockaddr_nl) = %d", sizeof(*addr), sizeof(*addr_nl));

    // ALOGI("Connecting socket");
    if (nl_connect(sock, NETLINK_GENERIC)) {
        ALOGE("Could not connect handle");
        nl_socket_free(sock);
        return NULL;
    }

    // ALOGI("Making socket nonblocking");
    /*
    if (nl_socket_set_nonblocking(sock)) {
        ALOGE("Could make socket non-blocking");
        nl_socket_free(sock);
        return NULL;
    }
    */

    return sock;
}

/*initialize function pointer table with Broadcom HHAL API*/
wifi_error init_wifi_vendor_hal_func_table(wifi_hal_fn *fn)
{
    if (fn == NULL) {
        return WIFI_ERROR_UNKNOWN;
    }
    fn->wifi_initialize = wifi_initialize;
    fn->wifi_cleanup = wifi_cleanup;
    fn->wifi_event_loop = wifi_event_loop;
    fn->wifi_get_supported_feature_set = wifi_get_supported_feature_set;
    fn->wifi_get_concurrency_matrix = wifi_get_concurrency_matrix;
    fn->wifi_set_scanning_mac_oui =  wifi_set_scanning_mac_oui;
    fn->wifi_get_ifaces = wifi_get_ifaces;
    fn->wifi_get_iface_name = wifi_get_iface_name;
    fn->wifi_start_gscan = wifi_start_gscan;
    fn->wifi_stop_gscan = wifi_stop_gscan;
    fn->wifi_get_cached_gscan_results = wifi_get_cached_gscan_results;
    fn->wifi_set_bssid_hotlist = wifi_set_bssid_hotlist;
    fn->wifi_reset_bssid_hotlist = wifi_reset_bssid_hotlist;
    fn->wifi_set_significant_change_handler = wifi_set_significant_change_handler;
    fn->wifi_reset_significant_change_handler = wifi_reset_significant_change_handler;
    fn->wifi_get_gscan_capabilities = wifi_get_gscan_capabilities;
    fn->wifi_get_link_stats = wifi_get_link_stats;
    fn->wifi_get_valid_channels = wifi_get_valid_channels;
    fn->wifi_rtt_range_request = wifi_rtt_range_request;
    fn->wifi_rtt_range_cancel = wifi_rtt_range_cancel;
    fn->wifi_get_rtt_capabilities = wifi_get_rtt_capabilities;
    fn->wifi_set_nodfs_flag = wifi_set_nodfs_flag;
    fn->wifi_start_logging = wifi_start_logging;
    fn->wifi_set_epno_list = wifi_set_epno_list;
    fn->wifi_set_country_code = wifi_set_country_code;
    fn->wifi_get_firmware_memory_dump = wifi_get_firmware_memory_dump;
    fn->wifi_set_log_handler = wifi_set_log_handler;
    fn->wifi_reset_log_handler = wifi_reset_log_handler;
    fn->wifi_set_alert_handler = wifi_set_alert_handler;
    fn->wifi_reset_alert_handler = wifi_reset_alert_handler;
    fn->wifi_get_firmware_version = wifi_get_firmware_version;
    fn->wifi_get_ring_buffers_status = wifi_get_ring_buffers_status;
    fn->wifi_get_logger_supported_feature_set = wifi_get_logger_supported_feature_set;
    fn->wifi_get_ring_data = wifi_get_ring_data;
    fn->wifi_get_driver_version = wifi_get_driver_version;
    fn->wifi_set_ssid_white_list = wifi_set_ssid_white_list;
    fn->wifi_set_gscan_roam_params = wifi_set_gscan_roam_params;
    fn->wifi_set_bssid_preference = wifi_set_bssid_preference;
    fn->wifi_set_bssid_blacklist = wifi_set_bssid_blacklist;
    fn->wifi_enable_lazy_roam = wifi_enable_lazy_roam;
    fn->wifi_start_rssi_monitoring = wifi_start_rssi_monitoring;
    fn->wifi_stop_rssi_monitoring = wifi_stop_rssi_monitoring;
    fn->wifi_start_sending_offloaded_packet = wifi_start_sending_offloaded_packet;
    fn->wifi_stop_sending_offloaded_packet = wifi_stop_sending_offloaded_packet;
    return WIFI_SUCCESS;
}

wifi_error wifi_initialize(wifi_handle *handle)
{
    srand(getpid());

    ALOGI("Initializing wifi");
    hal_info *info = (hal_info *)malloc(sizeof(hal_info));
    if (info == NULL) {
        ALOGE("Could not allocate hal_info");
        return WIFI_ERROR_UNKNOWN;
    }

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

    ALOGI("Creating socket");
    if (socketpair(AF_UNIX, SOCK_STREAM, 0, info->cleanup_socks) == -1) {
        ALOGE("Could not create cleanup sockets");
        free(info);
        return WIFI_ERROR_UNKNOWN;
    }

    struct nl_sock *cmd_sock = wifi_create_nl_socket(WIFI_HAL_CMD_SOCK_PORT);
    if (cmd_sock == NULL) {
        ALOGE("Could not create handle");
        free(info);
        return WIFI_ERROR_UNKNOWN;
    }

    struct nl_sock *event_sock = wifi_create_nl_socket(WIFI_HAL_EVENT_SOCK_PORT);
    if (event_sock == NULL) {
        ALOGE("Could not create handle");
        nl_socket_free(cmd_sock);
        free(info);
        return WIFI_ERROR_UNKNOWN;
    }

    struct nl_cb *cb = nl_socket_get_cb(event_sock);
    if (cb == NULL) {
        ALOGE("Could not create handle");
        nl_socket_free(cmd_sock);
        nl_socket_free(event_sock);
        free(info);
        return WIFI_ERROR_UNKNOWN;
    }

    // ALOGI("cb->refcnt = %d", cb->cb_refcnt);
    nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, internal_no_seq_check, info);
    nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, internal_valid_message_handler, info);
    nl_cb_put(cb);

    info->cmd_sock = cmd_sock;
    info->event_sock = event_sock;
    info->clean_up = false;
    info->in_event_loop = false;

    info->event_cb = (cb_info *)malloc(sizeof(cb_info) * DEFAULT_EVENT_CB_SIZE);
    info->alloc_event_cb = DEFAULT_EVENT_CB_SIZE;
    info->num_event_cb = 0;

    info->cmd = (cmd_info *)malloc(sizeof(cmd_info) * DEFAULT_CMD_SIZE);
    info->alloc_cmd = DEFAULT_CMD_SIZE;
    info->num_cmd = 0;

    info->nl80211_family_id = genl_ctrl_resolve(cmd_sock, "nl80211");
    if (info->nl80211_family_id < 0) {
        ALOGE("Could not resolve nl80211 familty id");
        nl_socket_free(cmd_sock);
        nl_socket_free(event_sock);
        free(info);
        return WIFI_ERROR_UNKNOWN;
    }

    pthread_mutex_init(&info->cb_lock, NULL);

    *handle = (wifi_handle) info;

    wifi_add_membership(*handle, "scan");
    wifi_add_membership(*handle, "mlme");
    wifi_add_membership(*handle, "regulatory");
    wifi_add_membership(*handle, "vendor");

    wifi_init_interfaces(*handle);
    // ALOGI("Found %d interfaces", info->num_interfaces);


    ALOGI("Initialized Wifi HAL Successfully; vendor cmd = %d", NL80211_CMD_VENDOR);
    return WIFI_SUCCESS;
}

static int wifi_add_membership(wifi_handle handle, const char *group)
{
    hal_info *info = getHalInfo(handle);

    int id = wifi_get_multicast_id(handle, "nl80211", group);
    if (id < 0) {
        ALOGE("Could not find group %s", group);
        return id;
    }

    int ret = nl_socket_add_membership(info->event_sock, id);
    if (ret < 0) {
        ALOGE("Could not add membership to group %s", group);
    }

    // ALOGI("Successfully added membership for group %s", group);
    return ret;
}

static void internal_cleaned_up_handler(wifi_handle handle)
{
    hal_info *info = getHalInfo(handle);
    wifi_cleaned_up_handler cleaned_up_handler = info->cleaned_up_handler;

    if (info->cmd_sock != 0) {
        close(info->cleanup_socks[0]);
        close(info->cleanup_socks[1]);
        nl_socket_free(info->cmd_sock);
        nl_socket_free(info->event_sock);
        info->cmd_sock = NULL;
        info->event_sock = NULL;
    }

    (*cleaned_up_handler)(handle);
    pthread_mutex_destroy(&info->cb_lock);
    free(info);

    ALOGI("Internal cleanup completed");
}

void wifi_cleanup(wifi_handle handle, wifi_cleaned_up_handler handler)
{
    hal_info *info = getHalInfo(handle);
    char buf[64];

    info->cleaned_up_handler = handler;
    if (write(info->cleanup_socks[0], "Exit", 4) < 1) {
        // As a fallback set the cleanup flag to TRUE
        ALOGE("could not write to the cleanup socket");
    } else {
        // Listen to the response
        // Hopefully we dont get errors or get hung up
        // Not much can be done in that case, but assume that
        // it has rx'ed the Exit message to exit the thread.
        // As a fallback set the cleanup flag to TRUE
        memset(buf, 0, sizeof(buf));
        int result = read(info->cleanup_socks[0], buf, sizeof(buf));
        ALOGE("%s: Read after POLL returned %d, error no = %d", __FUNCTION__, result, errno);
        if (strncmp(buf, "Done", 4) == 0) {
            ALOGE("Event processing terminated");
        } else {
            ALOGD("Rx'ed %s", buf);
        }
    }
    info->clean_up = true;
    pthread_mutex_lock(&info->cb_lock);

    int bad_commands = 0;

    for (int i = 0; i < info->num_event_cb; i++) {
        cb_info *cbi = &(info->event_cb[i]);
        WifiCommand *cmd = (WifiCommand *)cbi->cb_arg;
        ALOGI("Command left in event_cb %p:%s", cmd, (cmd ? cmd->getType(): ""));
    }

    while (info->num_cmd > bad_commands) {
        int num_cmd = info->num_cmd;
        cmd_info *cmdi = &(info->cmd[bad_commands]);
        WifiCommand *cmd = cmdi->cmd;
        if (cmd != NULL) {
            ALOGI("Cancelling command %p:%s", cmd, cmd->getType());
            pthread_mutex_unlock(&info->cb_lock);
            cmd->cancel();
            pthread_mutex_lock(&info->cb_lock);
            if (num_cmd == info->num_cmd) {
                ALOGI("Cancelling command %p:%s did not work", cmd, (cmd ? cmd->getType(): ""));
                bad_commands++;
            }
            /* release reference added when command is saved */
            cmd->releaseRef();
        }
    }

    for (int i = 0; i < info->num_event_cb; i++) {
        cb_info *cbi = &(info->event_cb[i]);
        WifiCommand *cmd = (WifiCommand *)cbi->cb_arg;
        ALOGE("Leaked command %p", cmd);
    }
    pthread_mutex_unlock(&info->cb_lock);
    internal_cleaned_up_handler(handle);
}

static int internal_pollin_handler(wifi_handle handle)
{
    hal_info *info = getHalInfo(handle);
    struct nl_cb *cb = nl_socket_get_cb(info->event_sock);
    int res = nl_recvmsgs(info->event_sock, cb);
    // ALOGD("nl_recvmsgs returned %d", res);
    nl_cb_put(cb);
    return res;
}

/* Run event handler */
void wifi_event_loop(wifi_handle handle)
{
    hal_info *info = getHalInfo(handle);
    if (info->in_event_loop) {
        return;
    } else {
        info->in_event_loop = true;
    }

    pollfd pfd[2];
    memset(&pfd[0], 0, sizeof(pollfd) * 2);

    pfd[0].fd = nl_socket_get_fd(info->event_sock);
    pfd[0].events = POLLIN;
    pfd[1].fd = info->cleanup_socks[1];
    pfd[1].events = POLLIN;

    char buf[2048];
    /* TODO: Add support for timeouts */

    do {
        int timeout = -1;                   /* Infinite timeout */
        pfd[0].revents = 0;
        pfd[1].revents = 0;
        // ALOGI("Polling socket");
        int result = poll(pfd, 2, timeout);
        if (result < 0) {
            // ALOGE("Error polling socket");
        } else if (pfd[0].revents & POLLERR) {
            ALOGE("POLL Error; error no = %d", errno);
            int result2 = read(pfd[0].fd, buf, sizeof(buf));
            ALOGE("Read after POLL returned %d, error no = %d", result2, errno);
        } else if (pfd[0].revents & POLLHUP) {
            ALOGE("Remote side hung up");
            break;
        } else if (pfd[0].revents & POLLIN) {
            // ALOGI("Found some events!!!");
            internal_pollin_handler(handle);
        } else if (pfd[1].revents & POLLIN) {
            memset(buf, 0, sizeof(buf));
            int result2 = read(pfd[1].fd, buf, sizeof(buf));
            ALOGE("%s: Read after POLL returned %d, error no = %d", __FUNCTION__, result2, errno);
            if (strncmp(buf, "Exit", 4) == 0) {
                ALOGD("Got a signal to exit!!!");
                if (write(pfd[1].fd, "Done", 4) < 1) {
                    ALOGE("could not write to the cleanup socket");
                }
                break;
            } else {
                ALOGD("Rx'ed %s on the cleanup socket\n", buf);
            }
        } else {
            ALOGE("Unknown event - %0x, %0x", pfd[0].revents, pfd[1].revents);
        }
    } while (!info->clean_up);
    ALOGI("Exit %s", __FUNCTION__);
}

///////////////////////////////////////////////////////////////////////////////////////

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

static int internal_valid_message_handler(nl_msg *msg, void *arg)
{
    // ALOGI("got an event");

    wifi_handle handle = (wifi_handle)arg;
    hal_info *info = getHalInfo(handle);

    WifiEvent event(msg);
    int res = event.parse();
    if (res < 0) {
        ALOGE("Failed to parse event: %d", res);
        return NL_SKIP;
    }

    int cmd = event.get_cmd();
    uint32_t vendor_id = 0;
    int subcmd = 0;

    if (cmd == NL80211_CMD_VENDOR) {
        vendor_id = event.get_u32(NL80211_ATTR_VENDOR_ID);
        subcmd = event.get_u32(NL80211_ATTR_VENDOR_SUBCMD);
        ALOGV("event received %s, vendor_id = 0x%0x, subcmd = 0x%0x",
                event.get_cmdString(), vendor_id, subcmd);
    } else {
        // ALOGV("event received %s", event.get_cmdString());
    }

    // ALOGV("event received %s, vendor_id = 0x%0x", event.get_cmdString(), vendor_id);
    // event.log();

    bool dispatched = false;

    pthread_mutex_lock(&info->cb_lock);

    for (int i = 0; i < info->num_event_cb; i++) {
        if (cmd == info->event_cb[i].nl_cmd) {
            if (cmd == NL80211_CMD_VENDOR
                && ((vendor_id != info->event_cb[i].vendor_id)
                || (subcmd != info->event_cb[i].vendor_subcmd)))
            {
                /* event for a different vendor, ignore it */
                continue;
            }

            cb_info *cbi = &(info->event_cb[i]);
            nl_recvmsg_msg_cb_t cb_func = cbi->cb_func;
            void *cb_arg = cbi->cb_arg;
            WifiCommand *cmd = (WifiCommand *)cbi->cb_arg;
            if (cmd != NULL) {
                cmd->addRef();
            }
            pthread_mutex_unlock(&info->cb_lock);
            if (cb_func)
                (*cb_func)(msg, cb_arg);
            if (cmd != NULL) {
                cmd->releaseRef();
            }

            return NL_OK;
        }
    }

    pthread_mutex_unlock(&info->cb_lock);
    return NL_OK;
}

///////////////////////////////////////////////////////////////////////////////////////

class GetMulticastIdCommand : public WifiCommand
{
private:
    const char *mName;
    const char *mGroup;
    int   mId;
public:
    GetMulticastIdCommand(wifi_handle handle, const char *name, const char *group)
        : WifiCommand("GetMulticastIdCommand", handle, 0)
    {
        mName = name;
        mGroup = group;
        mId = -1;
    }

    int getId() {
        return mId;
    }

    virtual int create() {
        int nlctrlFamily = genl_ctrl_resolve(mInfo->cmd_sock, "nlctrl");
        // ALOGI("ctrl family = %d", nlctrlFamily);
        int ret = mMsg.create(nlctrlFamily, CTRL_CMD_GETFAMILY, 0, 0);
        if (ret < 0) {
            return ret;
        }
        ret = mMsg.put_string(CTRL_ATTR_FAMILY_NAME, mName);
        return ret;
    }

    virtual int handleResponse(WifiEvent& reply) {

        // ALOGI("handling reponse in %s", __func__);

        struct nlattr **tb = reply.attributes();
        struct genlmsghdr *gnlh = reply.header();
        struct nlattr *mcgrp = NULL;
        int i;

        if (!tb[CTRL_ATTR_MCAST_GROUPS]) {
            ALOGI("No multicast groups found");
            return NL_SKIP;
        } else {
            // ALOGI("Multicast groups attr size = %d", nla_len(tb[CTRL_ATTR_MCAST_GROUPS]));
        }

        for_each_attr(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], i) {

            // ALOGI("Processing group");
            struct nlattr *tb2[CTRL_ATTR_MCAST_GRP_MAX + 1];
            nla_parse(tb2, CTRL_ATTR_MCAST_GRP_MAX, (nlattr *)nla_data(mcgrp),
                nla_len(mcgrp), NULL);
            if (!tb2[CTRL_ATTR_MCAST_GRP_NAME] || !tb2[CTRL_ATTR_MCAST_GRP_ID]) {
                continue;
            }

            char *grpName = (char *)nla_data(tb2[CTRL_ATTR_MCAST_GRP_NAME]);
            int grpNameLen = nla_len(tb2[CTRL_ATTR_MCAST_GRP_NAME]);

            // ALOGI("Found group name %s", grpName);

            if (strncmp(grpName, mGroup, grpNameLen) != 0)
                continue;

            mId = nla_get_u32(tb2[CTRL_ATTR_MCAST_GRP_ID]);
            break;
        }

        return NL_SKIP;
    }

};

class SetPnoMacAddrOuiCommand : public WifiCommand {

private:
    byte *mOui;
    feature_set *fset;
    feature_set *feature_matrix;
    int *fm_size;
    int set_size_max;
public:
    SetPnoMacAddrOuiCommand(wifi_interface_handle handle, oui scan_oui)
        : WifiCommand("SetPnoMacAddrOuiCommand", handle, 0)
    {
        mOui = scan_oui;
    }

    int createRequest(WifiRequest& request, int subcmd, byte *scan_oui) {
        int result = request.create(GOOGLE_OUI, subcmd);
        if (result < 0) {
            return result;
        }

        nlattr *data = request.attr_start(NL80211_ATTR_VENDOR_DATA);
        result = request.put(ANDR_WIFI_ATTRIBUTE_PNO_RANDOM_MAC_OUI, scan_oui, DOT11_OUI_LEN);
        if (result < 0) {
            return result;
        }

        request.attr_end(data);
        return WIFI_SUCCESS;

    }

    int start() {
        ALOGD("Sending mac address OUI");
        WifiRequest request(familyId(), ifaceId());
        int result = createRequest(request, WIFI_SUBCMD_SET_PNO_RANDOM_MAC_OUI, mOui);
        if (result != WIFI_SUCCESS) {
            ALOGE("failed to create request; result = %d", result);
            return result;
        }

        result = requestResponse(request);
        if (result != WIFI_SUCCESS) {
            ALOGE("failed to set scanning mac OUI; result = %d", result);
        }

        return result;
    }
protected:
    virtual int handleResponse(WifiEvent& reply) {
         ALOGD("Request complete!");
        /* Nothing to do on response! */
        return NL_SKIP;
    }
};

class SetNodfsCommand : public WifiCommand {

private:
    u32 mNoDfs;
public:
    SetNodfsCommand(wifi_interface_handle handle, u32 nodfs)
        : WifiCommand("SetNodfsCommand", handle, 0) {
        mNoDfs = nodfs;
    }
    virtual int create() {
        int ret;

        ret = mMsg.create(GOOGLE_OUI, WIFI_SUBCMD_NODFS_SET);
        if (ret < 0) {
            ALOGE("Can't create message to send to driver - %d", ret);
            return ret;
        }

        nlattr *data = mMsg.attr_start(NL80211_ATTR_VENDOR_DATA);
        ret = mMsg.put_u32(ATTR_NODFS_VALUE, mNoDfs);
        if (ret < 0) {
             return ret;
        }

        mMsg.attr_end(data);
        return WIFI_SUCCESS;
    }
};

class SetCountryCodeCommand : public WifiCommand {
private:
    const char *mCountryCode;
public:
    SetCountryCodeCommand(wifi_interface_handle handle, const char *country_code)
        : WifiCommand("SetCountryCodeCommand", handle, 0) {
        mCountryCode = country_code;
        }
    virtual int create() {
        int ret;

        ret = mMsg.create(GOOGLE_OUI, WIFI_SUBCMD_SET_COUNTRY_CODE);
        if (ret < 0) {
             ALOGE("Can't create message to send to driver - %d", ret);
             return ret;
        }

        nlattr *data = mMsg.attr_start(NL80211_ATTR_VENDOR_DATA);
        ret = mMsg.put_string(ATTR_COUNTRY_CODE, mCountryCode);
        if (ret < 0) {
            return ret;
        }

        mMsg.attr_end(data);
        return WIFI_SUCCESS;

    }
};

class SetRSSIMonitorCommand : public WifiCommand {
private:
    s8 mMax_rssi;
    s8 mMin_rssi;
    wifi_rssi_event_handler mHandler;
public:
    SetRSSIMonitorCommand(wifi_request_id id, wifi_interface_handle handle,
                s8 max_rssi, s8 min_rssi, wifi_rssi_event_handler eh)
        : WifiCommand("SetRSSIMonitorCommand", handle, id), mMax_rssi(max_rssi), mMin_rssi
        (min_rssi), mHandler(eh)
        {
        }
   int createRequest(WifiRequest& request, int enable) {
        int result = request.create(GOOGLE_OUI, WIFI_SUBCMD_SET_RSSI_MONITOR);
        if (result < 0) {
            return result;
        }

        nlattr *data = request.attr_start(NL80211_ATTR_VENDOR_DATA);
        result = request.put_u32(RSSI_MONITOR_ATTRIBUTE_MAX_RSSI, (enable ? mMax_rssi: 0));
        if (result < 0) {
            return result;
        }
        ALOGD("create request");
        result = request.put_u32(RSSI_MONITOR_ATTRIBUTE_MIN_RSSI, (enable? mMin_rssi: 0));
        if (result < 0) {
            return result;
        }
        result = request.put_u32(RSSI_MONITOR_ATTRIBUTE_START, enable);
        if (result < 0) {
            return result;
        }
        request.attr_end(data);
        return result;
    }

    int start() {
        WifiRequest request(familyId(), ifaceId());
        int result = createRequest(request, 1);
        if (result < 0) {
            return result;
        }
        result = requestResponse(request);
        if (result < 0) {
            ALOGI("Failed to set RSSI Monitor, result = %d", result);
            return result;
        }
        ALOGI("Successfully set RSSI monitoring");
        registerVendorHandler(GOOGLE_OUI, GOOGLE_RSSI_MONITOR_EVENT);


        if (result < 0) {
            unregisterVendorHandler(GOOGLE_OUI, GOOGLE_RSSI_MONITOR_EVENT);
            return result;
        }
        ALOGI("Done!");
        return result;
    }

    virtual int cancel() {

        WifiRequest request(familyId(), ifaceId());
        int result = createRequest(request, 0);
        if (result != WIFI_SUCCESS) {
            ALOGE("failed to create request; result = %d", result);
        } else {
            result = requestResponse(request);
            if (result != WIFI_SUCCESS) {
                ALOGE("failed to stop RSSI monitoring = %d", result);
            }
        }
        unregisterVendorHandler(GOOGLE_OUI, GOOGLE_RSSI_MONITOR_EVENT);
        return WIFI_SUCCESS;
    }

    virtual int handleResponse(WifiEvent& reply) {
        /* Nothing to do on response! */
        return NL_SKIP;
    }

   virtual int handleEvent(WifiEvent& event) {
        ALOGI("Got a RSSI monitor event");

        nlattr *vendor_data = event.get_attribute(NL80211_ATTR_VENDOR_DATA);
        int len = event.get_vendor_data_len();

        if (vendor_data == NULL || len == 0) {
            ALOGI("RSSI monitor: No data");
            return NL_SKIP;
        }
        /* driver<->HAL event structure */
        #define RSSI_MONITOR_EVT_VERSION   1
        typedef struct {
            u8 version;
            s8 cur_rssi;
            mac_addr BSSID;
        } rssi_monitor_evt;

        rssi_monitor_evt *data = (rssi_monitor_evt *)event.get_vendor_data();

        if (data->version != RSSI_MONITOR_EVT_VERSION) {
            ALOGI("Event version mismatch %d, expected %d", data->version, RSSI_MONITOR_EVT_VERSION);
            return NL_SKIP;
        }

        if (*mHandler.on_rssi_threshold_breached) {
            (*mHandler.on_rssi_threshold_breached)(id(), data->BSSID, data->cur_rssi);
        } else {
            ALOGW("No RSSI monitor handler registered");
        }

        return NL_SKIP;
    }

};

class GetFeatureSetCommand : public WifiCommand {

private:
    int feature_type;
    feature_set *fset;
    feature_set *feature_matrix;
    int *fm_size;
    int set_size_max;
public:
    GetFeatureSetCommand(wifi_interface_handle handle, int feature, feature_set *set,
         feature_set set_matrix[], int *size, int max_size)
        : WifiCommand("GetFeatureSetCommand", handle, 0)
    {
        feature_type = feature;
        fset = set;
        feature_matrix = set_matrix;
        fm_size = size;
        set_size_max = max_size;
    }

    virtual int create() {
        int ret;

        if(feature_type == FEATURE_SET) {
            ret = mMsg.create(GOOGLE_OUI, WIFI_SUBCMD_GET_FEATURE_SET);
        } else if (feature_type == FEATURE_SET_MATRIX) {
            ret = mMsg.create(GOOGLE_OUI, WIFI_SUBCMD_GET_FEATURE_SET_MATRIX);
        } else {
            ALOGE("Unknown feature type %d", feature_type);
            return -1;
        }

        if (ret < 0) {
            ALOGE("Can't create message to send to driver - %d", ret);
        }

        return ret;
    }

protected:
    virtual int handleResponse(WifiEvent& reply) {

        ALOGV("In GetFeatureSetCommand::handleResponse");

        if (reply.get_cmd() != NL80211_CMD_VENDOR) {
            ALOGD("Ignoring reply with cmd = %d", reply.get_cmd());
            return NL_SKIP;
        }

        int id = reply.get_vendor_id();
        int subcmd = reply.get_vendor_subcmd();

        nlattr *vendor_data = reply.get_attribute(NL80211_ATTR_VENDOR_DATA);
        int len = reply.get_vendor_data_len();

        ALOGV("Id = %0x, subcmd = %d, len = %d", id, subcmd, len);
        if (vendor_data == NULL || len == 0) {
            ALOGE("no vendor data in GetFeatureSetCommand response; ignoring it");
            return NL_SKIP;
        }
        if(feature_type == FEATURE_SET) {
            void *data = reply.get_vendor_data();
            if(!fset) {
                ALOGE("Buffers pointers not set");
                return NL_SKIP;
            }
            memcpy(fset, data, min(len, (int) sizeof(*fset)));
        } else {
            int num_features_set = 0;
            int i = 0;

            if(!feature_matrix || !fm_size) {
                ALOGE("Buffers pointers not set");
                return NL_SKIP;
            }

            for (nl_iterator it(vendor_data); it.has_next(); it.next()) {
                if (it.get_type() == ANDR_WIFI_ATTRIBUTE_NUM_FEATURE_SET) {
                    num_features_set = it.get_u32();
                    ALOGV("Got feature list with %d concurrent sets", num_features_set);
                    if(set_size_max && (num_features_set > set_size_max))
                        num_features_set = set_size_max;
                    *fm_size = num_features_set;
                } else if ((it.get_type() == ANDR_WIFI_ATTRIBUTE_FEATURE_SET) &&
                             i < num_features_set) {
                    feature_matrix[i] = it.get_u32();
                    i++;
                } else {
                    ALOGW("Ignoring invalid attribute type = %d, size = %d",
                            it.get_type(), it.get_len());
                }
            }

        }
        return NL_OK;
    }

};

static int wifi_get_multicast_id(wifi_handle handle, const char *name, const char *group)
{
    GetMulticastIdCommand cmd(handle, name, group);
    int res = cmd.requestResponse();
    if (res < 0)
        return res;
    else
        return cmd.getId();
}

/////////////////////////////////////////////////////////////////////////

static bool is_wifi_interface(const char *name)
{
    if (strncmp(name, "wlan", 4) != 0 && strncmp(name, "p2p", 3) != 0) {
        /* not a wifi interface; ignore it */
        return false;
    } else {
        return true;
    }
}

static int get_interface(const char *name, interface_info *info)
{
    strcpy(info->name, name);
    info->id = if_nametoindex(name);
    // ALOGI("found an interface : %s, id = %d", name, info->id);
    return WIFI_SUCCESS;
}

wifi_error wifi_init_interfaces(wifi_handle handle)
{
    hal_info *info = (hal_info *)handle;

    struct dirent *de;

    DIR *d = opendir("/sys/class/net");
    if (d == 0)
        return WIFI_ERROR_UNKNOWN;

    int n = 0;
    while ((de = readdir(d))) {
        if (de->d_name[0] == '.')
            continue;
        if (is_wifi_interface(de->d_name) ) {
            n++;
        }
    }

    closedir(d);

    d = opendir("/sys/class/net");
    if (d == 0)
        return WIFI_ERROR_UNKNOWN;

    info->interfaces = (interface_info **)malloc(sizeof(interface_info *) * n);

    int i = 0;
    while ((de = readdir(d))) {
        if (de->d_name[0] == '.')
            continue;
        if (is_wifi_interface(de->d_name)) {
            interface_info *ifinfo = (interface_info *)malloc(sizeof(interface_info));
            if (get_interface(de->d_name, ifinfo) != WIFI_SUCCESS) {
                free(ifinfo);
                continue;
            }
            ifinfo->handle = handle;
            info->interfaces[i] = ifinfo;
            i++;
        }
    }

    closedir(d);

    info->num_interfaces = n;
    return WIFI_SUCCESS;
}

wifi_error wifi_get_ifaces(wifi_handle handle, int *num, wifi_interface_handle **interfaces)
{
    hal_info *info = (hal_info *)handle;

    *interfaces = (wifi_interface_handle *)info->interfaces;
    *num = info->num_interfaces;

    return WIFI_SUCCESS;
}

wifi_error wifi_get_iface_name(wifi_interface_handle handle, char *name, size_t size)
{
    interface_info *info = (interface_info *)handle;
    strcpy(name, info->name);
    return WIFI_SUCCESS;
}

wifi_error wifi_get_supported_feature_set(wifi_interface_handle handle, feature_set *set)
{
    GetFeatureSetCommand command(handle, FEATURE_SET, set, NULL, NULL, 1);
    return (wifi_error) command.requestResponse();
}

wifi_error wifi_get_concurrency_matrix(wifi_interface_handle handle, int set_size_max,
       feature_set set[], int *set_size)
{
    GetFeatureSetCommand command(handle, FEATURE_SET_MATRIX, NULL, set, set_size, set_size_max);
    return (wifi_error) command.requestResponse();
}

wifi_error wifi_set_scanning_mac_oui(wifi_interface_handle handle, oui scan_oui)
{
    SetPnoMacAddrOuiCommand command(handle, scan_oui);
    return (wifi_error)command.start();

}

wifi_error wifi_set_nodfs_flag(wifi_interface_handle handle, u32 nodfs)
{
    SetNodfsCommand command(handle, nodfs);
    return (wifi_error) command.requestResponse();
}

wifi_error wifi_set_country_code(wifi_interface_handle handle, const char *country_code)
{
    SetCountryCodeCommand command(handle, country_code);
    return (wifi_error) command.requestResponse();
}

static wifi_error wifi_start_rssi_monitoring(wifi_request_id id, wifi_interface_handle
                        iface, s8 max_rssi, s8 min_rssi, wifi_rssi_event_handler eh)
{
    ALOGD("Start RSSI monitor %d", id);
    wifi_handle handle = getWifiHandle(iface);
    SetRSSIMonitorCommand *cmd = new SetRSSIMonitorCommand(id, iface, max_rssi, min_rssi, eh);
    wifi_register_cmd(handle, id, cmd);

    wifi_error result = (wifi_error)cmd->start();
    if (result != WIFI_SUCCESS) {
        wifi_unregister_cmd(handle, id);
    }
    return result;
}


static wifi_error wifi_stop_rssi_monitoring(wifi_request_id id, wifi_interface_handle iface)
{
    ALOGD("Stopping RSSI monitor");

    if(id == -1) {
        wifi_rssi_event_handler handler;
        s8 max_rssi = 0, min_rssi = 0;
        wifi_handle handle = getWifiHandle(iface);
        memset(&handler, 0, sizeof(handler));
        SetRSSIMonitorCommand *cmd = new SetRSSIMonitorCommand(id, iface,
                                                    max_rssi, min_rssi, handler);
        cmd->cancel();
        cmd->releaseRef();
        return WIFI_SUCCESS;
    }
    return wifi_cancel_cmd(id, iface);
}

/////////////////////////////////////////////////////////////////////////////