driver_prism54.c

Go to the documentation of this file.

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <errno.h>

#include "wireless_copy.h"
#include "common.h"
#include "driver.h"
#include "driver_wext.h"
#include "driver_hostap.h"
#include "l2_packet.h"
#include "wpa_supplicant.h"

struct wpa_driver_prism54_data {
        void *wext; /* private data for driver_wext */
        void *ctx;
        char ifname[IFNAMSIZ + 1];
        int sock;
};

#define PRISM54_SET_WPA                 SIOCIWFIRSTPRIV+12
#define PRISM54_HOSTAPD                 SIOCIWFIRSTPRIV+25
#define PRISM54_DROP_UNENCRYPTED        SIOCIWFIRSTPRIV+26

static void show_set_key_error(struct prism2_hostapd_param *);

static int hostapd_ioctl_prism54(struct wpa_driver_prism54_data *drv,
                                 struct prism2_hostapd_param *param,
                                 int len, int show_err)
{
        struct iwreq iwr;

        memset(&iwr, 0, sizeof(iwr));
        strncpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
        iwr.u.data.pointer = (caddr_t) param;
        iwr.u.data.length = len;

        if (ioctl(drv->sock, PRISM54_HOSTAPD, &iwr) < 0) {
                int ret = errno;
                if (show_err) 
                        perror("ioctl[PRISM54_HOSTAPD]");
                return ret;
        }

        return 0;
}


static int wpa_driver_prism54_set_wpa_ie(struct wpa_driver_prism54_data *drv,
                                         const u8 *wpa_ie,
                                         size_t wpa_ie_len)
{
        struct prism2_hostapd_param *param;
        int res;
        size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN + wpa_ie_len;
        if (blen < sizeof(*param))
                blen = sizeof(*param);

        param = (struct prism2_hostapd_param *) malloc(blen);
        if (param == NULL)
                return -1;
        
        memset(param, 0, blen);
        param->cmd = PRISM2_HOSTAPD_SET_GENERIC_ELEMENT;
        param->u.generic_elem.len = wpa_ie_len;
        memcpy(param->u.generic_elem.data, wpa_ie, wpa_ie_len);
        res = hostapd_ioctl_prism54(drv, param, blen, 1);

        free(param);

        return res;
}


/* This is called at wpa_supplicant daemon init time */
static int wpa_driver_prism54_set_wpa(void *priv, int enabled)
{
        struct wpa_driver_prism54_data *drv = priv;
        struct prism2_hostapd_param *param;
        int res;
        size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN;
        if (blen < sizeof(*param))
                blen = sizeof(*param);

        param = (struct prism2_hostapd_param *) malloc(blen);
        if (param == NULL)
                return -1;

        memset(param, 0, blen);
        param->cmd = PRISM54_SET_WPA;
        param->u.generic_elem.len = 0;
        res = hostapd_ioctl_prism54(drv, param, blen, 1);

        free(param);

        return res;
}


static int wpa_driver_prism54_set_key(void *priv, 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 wpa_driver_prism54_data *drv = priv;
        struct prism2_hostapd_param *param;
        u8 *buf;
        size_t blen;
        int ret = 0;
        char *alg_name;

        switch (alg) {
        case WPA_ALG_NONE:
                alg_name = "none";
                return -1;
                break;
        case WPA_ALG_WEP:
                alg_name = "WEP";
                return -1;
                break;
        case WPA_ALG_TKIP:
                alg_name = "TKIP";
                break;
        case WPA_ALG_CCMP:
                alg_name = "CCMP";
                return -1;
                break;
        default:
                return -1;
        }

        wpa_printf(MSG_DEBUG, "%s: alg=%s key_idx=%d set_tx=%d seq_len=%lu "
                   "key_len=%lu", __FUNCTION__, alg_name, key_idx, set_tx,
                   (unsigned long) seq_len, (unsigned long) key_len);

        if (seq_len > 8)
                return -2;

        blen = sizeof(*param) + key_len;
        buf = malloc(blen);
        if (buf == NULL)
                return -1;
        memset(buf, 0, blen);

        param = (struct prism2_hostapd_param *) buf;
        param->cmd = PRISM2_SET_ENCRYPTION;
        /* TODO: In theory, STA in client mode can use five keys; four default
         * keys for receiving (with keyidx 0..3) and one individual key for
         * both transmitting and receiving (keyidx 0) _unicast_ packets. Now,
         * keyidx 0 is reserved for this unicast use and default keys can only
         * use keyidx 1..3 (i.e., default key with keyidx 0 is not supported).
         * This should be fine for more or less all cases, but for completeness
         * sake, the driver could be enhanced to support the missing key. */
#if 0
        if (addr == NULL)
                memset(param->sta_addr, 0xff, ETH_ALEN);
        else
                memcpy(param->sta_addr, addr, ETH_ALEN);
#else
        memset(param->sta_addr, 0xff, ETH_ALEN);
#endif
        strncpy((char *) param->u.crypt.alg, alg_name,
                HOSTAP_CRYPT_ALG_NAME_LEN);
        param->u.crypt.flags = set_tx ? HOSTAP_CRYPT_FLAG_SET_TX_KEY : 0;
        param->u.crypt.idx = key_idx;
        memcpy(param->u.crypt.seq, seq, seq_len);
        param->u.crypt.key_len = key_len;
        memcpy((u8 *) (param + 1), key, key_len);

        if (hostapd_ioctl_prism54(drv, param, blen, 1)) {
                wpa_printf(MSG_WARNING, "Failed to set encryption.");
                show_set_key_error(param);
                ret = -1;
        }
        free(buf);

        return ret;
}


static int wpa_driver_prism54_set_countermeasures(void *priv,
                                                 int enabled)
{
        /* FIX */
        printf("wpa_driver_prism54_set_countermeasures - not yet "
               "implemented\n");
        return 0;
}


static int wpa_driver_prism54_set_drop_unencrypted(void *priv,
                                                  int enabled)
{
        struct wpa_driver_prism54_data *drv = priv;
        struct prism2_hostapd_param *param;
        int res;
        size_t blen = PRISM2_HOSTAPD_GENERIC_ELEMENT_HDR_LEN;
        if (blen < sizeof(*param))
                blen = sizeof(*param);

        param = (struct prism2_hostapd_param *) malloc(blen);
        if (param == NULL)
                return -1;

        memset(param, 0, blen);
        param->cmd = PRISM54_DROP_UNENCRYPTED;
        param->u.generic_elem.len = 0;
        res = hostapd_ioctl_prism54(drv, param, blen, 1);

        free(param);

        return res;
}


static int wpa_driver_prism54_deauthenticate(void *priv, const u8 *addr,
                                             int reason_code)
{
        /* FIX */
        printf("wpa_driver_prism54_deauthenticate - not yet implemented\n");
        return 0;
}


static int wpa_driver_prism54_disassociate(void *priv, const u8 *addr,
                                           int reason_code)
{
        /* FIX */
        printf("wpa_driver_prism54_disassociate - not yet implemented\n");
        return 0;
}


static int
wpa_driver_prism54_associate(void *priv,
                             struct wpa_driver_associate_params *params)
{
        struct wpa_driver_prism54_data *drv = priv;
        int ret = 0;

        if (wpa_driver_prism54_set_wpa_ie(drv, params->wpa_ie,
                                          params->wpa_ie_len) < 0)
                ret = -1;
        if (wpa_driver_wext_set_freq(drv->wext, params->freq) < 0)
                ret = -1;
        if (wpa_driver_wext_set_ssid(drv->wext, params->ssid,
                                     params->ssid_len) < 0)
                ret = -1;
        if (wpa_driver_wext_set_bssid(drv->wext, params->bssid) < 0)
                ret = -1;

        return ret;
}

static void show_set_key_error(struct prism2_hostapd_param *param)
{
        switch (param->u.crypt.err) {
        case HOSTAP_CRYPT_ERR_UNKNOWN_ALG:
                wpa_printf(MSG_INFO, "Unknown algorithm '%s'.",
                           param->u.crypt.alg);
                wpa_printf(MSG_INFO, "You may need to load kernel module to "
                           "register that algorithm.");
                wpa_printf(MSG_INFO, "E.g., 'modprobe hostap_crypt_wep' for "
                           "WEP.");
                break;
        case HOSTAP_CRYPT_ERR_UNKNOWN_ADDR:
                wpa_printf(MSG_INFO, "Unknown address " MACSTR ".",
                           MAC2STR(param->sta_addr));
                break;
        case HOSTAP_CRYPT_ERR_CRYPT_INIT_FAILED:
                wpa_printf(MSG_INFO, "Crypt algorithm initialization failed.");
                break;
        case HOSTAP_CRYPT_ERR_KEY_SET_FAILED:
                wpa_printf(MSG_INFO, "Key setting failed.");
                break;
        case HOSTAP_CRYPT_ERR_TX_KEY_SET_FAILED:
                wpa_printf(MSG_INFO, "TX key index setting failed.");
                break;
        case HOSTAP_CRYPT_ERR_CARD_CONF_FAILED:
                wpa_printf(MSG_INFO, "Card configuration failed.");
                break;
        }
}


static int wpa_driver_prism54_get_bssid(void *priv, u8 *bssid)
{
        struct wpa_driver_prism54_data *drv = priv;
        return wpa_driver_wext_get_bssid(drv->wext, bssid);
}


static int wpa_driver_prism54_get_ssid(void *priv, u8 *ssid)
{
        struct wpa_driver_prism54_data *drv = priv;
        return wpa_driver_wext_get_ssid(drv->wext, ssid);
}


static int wpa_driver_prism54_scan(void *priv, const u8 *ssid, size_t ssid_len)
{
        struct wpa_driver_prism54_data *drv = priv;
        return wpa_driver_wext_scan(drv->wext, ssid, ssid_len);
}


static int wpa_driver_prism54_get_scan_results(void *priv,
                                            struct wpa_scan_result *results,
                                            size_t max_size)
{
        struct wpa_driver_prism54_data *drv = priv;
        return wpa_driver_wext_get_scan_results(drv->wext, results, max_size);
}


static void * wpa_driver_prism54_init(void *ctx, const char *ifname)
{
        struct wpa_driver_prism54_data *drv;

        drv = malloc(sizeof(*drv));
        if (drv == NULL)
                return NULL;
        memset(drv, 0, sizeof(*drv));
        drv->wext = wpa_driver_wext_init(ctx, ifname);
        if (drv->wext == NULL) {
                free(drv);
                return NULL;
        }

        drv->ctx = ctx;
        strncpy(drv->ifname, ifname, sizeof(drv->ifname));
        drv->sock = socket(PF_INET, SOCK_DGRAM, 0);
        if (drv->sock < 0) {
                wpa_driver_wext_deinit(drv->wext);
                free(drv);
                return NULL;
        }

        return drv;
}


static void wpa_driver_prism54_deinit(void *priv)
{
        struct wpa_driver_prism54_data *drv = priv;
        wpa_driver_wext_deinit(drv->wext);
        close(drv->sock);
        free(drv);
}


const struct wpa_driver_ops wpa_driver_prism54_ops = {
        .name = "prism54",
        .desc = "Prism54.org driver (Intersil Prism GT/Duette/Indigo)",
        .get_bssid = wpa_driver_prism54_get_bssid,
        .get_ssid = wpa_driver_prism54_get_ssid,
        .set_wpa = wpa_driver_prism54_set_wpa,
        .set_key = wpa_driver_prism54_set_key,
        .set_countermeasures = wpa_driver_prism54_set_countermeasures,
        .set_drop_unencrypted = wpa_driver_prism54_set_drop_unencrypted,
        .scan = wpa_driver_prism54_scan,
        .get_scan_results = wpa_driver_prism54_get_scan_results,
        .deauthenticate = wpa_driver_prism54_deauthenticate,
        .disassociate = wpa_driver_prism54_disassociate,
        .associate = wpa_driver_prism54_associate,
        .init = wpa_driver_prism54_init,
        .deinit = wpa_driver_prism54_deinit,
};

---