driver_nl80211.c

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	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	iwr.u.data.pointer = (caddr_t) ie;
	iwr.u.data.length = ie_len;

	if (ioctl(drv->ioctl_sock, SIOCSIWGENIE, &iwr) < 0) {
		perror("ioctl[SIOCSIWGENIE]");
		ret = -1;
	}

	return ret;
}


static int wpa_driver_nl80211_cipher2wext(int cipher)
{
	switch (cipher) {
	case CIPHER_NONE:
		return IW_AUTH_CIPHER_NONE;
	case CIPHER_WEP40:
		return IW_AUTH_CIPHER_WEP40;
	case CIPHER_TKIP:
		return IW_AUTH_CIPHER_TKIP;
	case CIPHER_CCMP:
		return IW_AUTH_CIPHER_CCMP;
	case CIPHER_WEP104:
		return IW_AUTH_CIPHER_WEP104;
	default:
		return 0;
	}
}


static int wpa_driver_nl80211_keymgmt2wext(int keymgmt)
{
	switch (keymgmt) {
	case KEY_MGMT_802_1X:
	case KEY_MGMT_802_1X_NO_WPA:
		return IW_AUTH_KEY_MGMT_802_1X;
	case KEY_MGMT_PSK:
		return IW_AUTH_KEY_MGMT_PSK;
	default:
		return 0;
	}
}


static int
wpa_driver_nl80211_auth_alg_fallback(struct wpa_driver_nl80211_data *drv,
				  struct wpa_driver_associate_params *params)
{
	struct iwreq iwr;
	int ret = 0;

	wpa_printf(MSG_DEBUG, "WEXT: Driver did not support "
		   "SIOCSIWAUTH for AUTH_ALG, trying SIOCSIWENCODE");

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	/* Just changing mode, not actual keys */
	iwr.u.encoding.flags = 0;
	iwr.u.encoding.pointer = (caddr_t) NULL;
	iwr.u.encoding.length = 0;

	/*
	 * Note: IW_ENCODE_{OPEN,RESTRICTED} can be interpreted to mean two
	 * different things. Here they are used to indicate Open System vs.
	 * Shared Key authentication algorithm. However, some drivers may use
	 * them to select between open/restricted WEP encrypted (open = allow
	 * both unencrypted and encrypted frames; restricted = only allow
	 * encrypted frames).
	 */

	if (!drv->use_crypt) {
		iwr.u.encoding.flags |= IW_ENCODE_DISABLED;
	} else {
		if (params->auth_alg & AUTH_ALG_OPEN_SYSTEM)
			iwr.u.encoding.flags |= IW_ENCODE_OPEN;
		if (params->auth_alg & AUTH_ALG_SHARED_KEY)
			iwr.u.encoding.flags |= IW_ENCODE_RESTRICTED;
	}

	if (ioctl(drv->ioctl_sock, SIOCSIWENCODE, &iwr) < 0) {
		perror("ioctl[SIOCSIWENCODE]");
		ret = -1;
	}

	return ret;
}


static int wpa_driver_nl80211_associate(
	void *priv, struct wpa_driver_associate_params *params)
{
	struct wpa_driver_nl80211_data *drv = priv;
	int ret = 0;
	int allow_unencrypted_eapol;
	int value;

	wpa_printf(MSG_DEBUG, "%s", __FUNCTION__);

	/*
	 * If the driver did not support SIOCSIWAUTH, fallback to
	 * SIOCSIWENCODE here.
	 */
	if (drv->auth_alg_fallback &&
	    wpa_driver_nl80211_auth_alg_fallback(drv, params) < 0)
		ret = -1;

	if (!params->bssid &&
	    wpa_driver_nl80211_set_bssid(drv, NULL) < 0)
		ret = -1;

	/* TODO: should consider getting wpa version and cipher/key_mgmt suites
	 * from configuration, not from here, where only the selected suite is
	 * available */
	if (wpa_driver_nl80211_set_gen_ie(drv, params->wpa_ie, params->wpa_ie_len)
	    < 0)
		ret = -1;
	if (params->wpa_ie == NULL || params->wpa_ie_len == 0)
		value = IW_AUTH_WPA_VERSION_DISABLED;
	else if (params->wpa_ie[0] == WLAN_EID_RSN)
		value = IW_AUTH_WPA_VERSION_WPA2;
	else
		value = IW_AUTH_WPA_VERSION_WPA;
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_WPA_VERSION, value) < 0)
		ret = -1;
	value = wpa_driver_nl80211_cipher2wext(params->pairwise_suite);
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_CIPHER_PAIRWISE, value) < 0)
		ret = -1;
	value = wpa_driver_nl80211_cipher2wext(params->group_suite);
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_CIPHER_GROUP, value) < 0)
		ret = -1;
	value = wpa_driver_nl80211_keymgmt2wext(params->key_mgmt_suite);
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_KEY_MGMT, value) < 0)
		ret = -1;
	value = params->key_mgmt_suite != KEY_MGMT_NONE ||
		params->pairwise_suite != CIPHER_NONE ||
		params->group_suite != CIPHER_NONE ||
		params->wpa_ie_len;
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_PRIVACY_INVOKED, value) < 0)
		ret = -1;

	/* Allow unencrypted EAPOL messages even if pairwise keys are set when
	 * not using WPA. IEEE 802.1X specifies that these frames are not
	 * encrypted, but WPA encrypts them when pairwise keys are in use. */
	if (params->key_mgmt_suite == KEY_MGMT_802_1X ||
	    params->key_mgmt_suite == KEY_MGMT_PSK)
		allow_unencrypted_eapol = 0;
	else
		allow_unencrypted_eapol = 1;
	
	if (wpa_driver_nl80211_set_auth_param(drv,
					   IW_AUTH_RX_UNENCRYPTED_EAPOL,
					   allow_unencrypted_eapol) < 0)
		ret = -1;
	if (params->freq && wpa_driver_nl80211_set_freq(drv, params->freq) < 0)
		ret = -1;
	if (wpa_driver_nl80211_set_ssid(drv, params->ssid, params->ssid_len) < 0)
		ret = -1;
	if (params->bssid &&
	    wpa_driver_nl80211_set_bssid(drv, params->bssid) < 0)
		ret = -1;

	return ret;
}


static int wpa_driver_nl80211_set_auth_alg(void *priv, int auth_alg)
{
	struct wpa_driver_nl80211_data *drv = priv;
	int algs = 0, res;

	if (auth_alg & AUTH_ALG_OPEN_SYSTEM)
		algs |= IW_AUTH_ALG_OPEN_SYSTEM;
	if (auth_alg & AUTH_ALG_SHARED_KEY)
		algs |= IW_AUTH_ALG_SHARED_KEY;
	if (auth_alg & AUTH_ALG_LEAP)
		algs |= IW_AUTH_ALG_LEAP;
	if (algs == 0) {
		/* at least one algorithm should be set */
		algs = IW_AUTH_ALG_OPEN_SYSTEM;
	}

	res = wpa_driver_nl80211_set_auth_param(drv, IW_AUTH_80211_AUTH_ALG,
					     algs);
	drv->auth_alg_fallback = res == -2;
	return res;
}


/**
 * wpa_driver_nl80211_set_mode - Set wireless mode (infra/adhoc), SIOCSIWMODE
 * @priv: Pointer to private wext data from wpa_driver_nl80211_init()
 * @mode: 0 = infra/BSS (associate with an AP), 1 = adhoc/IBSS
 * Returns: 0 on success, -1 on failure
 */
static int wpa_driver_nl80211_set_mode(void *priv, int mode)
{
	struct wpa_driver_nl80211_data *drv = priv;
	int ret = -1, flags;
	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_SET_INTERFACE, 0);
	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE,
		    mode ? NL80211_IFTYPE_ADHOC : NL80211_IFTYPE_STATION);

	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
	if (!ret)
		return 0;
	else
		goto try_again;

nla_put_failure:
	wpa_printf(MSG_ERROR, "nl80211: Failed to set interface mode");
	return -1;

try_again:
	/* 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 (wpa_driver_nl80211_get_ifflags(drv, &flags) == 0) {
		(void) wpa_driver_nl80211_set_ifflags(drv, flags & ~IFF_UP);

		/* Try to set the mode again while the interface is down */
		msg = nlmsg_alloc();
		if (!msg)
			return -1;

		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, drv->ifindex);
		NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE,
			    mode ? NL80211_IFTYPE_ADHOC :
			    NL80211_IFTYPE_STATION);
		ret = send_and_recv_msgs(drv, msg, NULL, NULL);
		if (ret) {
			wpa_printf(MSG_ERROR, "Failed to set interface %s "
				   "mode", drv->ifname);
		}

		/* Ignore return value of get_ifflags to ensure that the device
		 * is always up like it was before this function was called.
		 */
		(void) wpa_driver_nl80211_get_ifflags(drv, &flags);
		(void) wpa_driver_nl80211_set_ifflags(drv, flags | IFF_UP);
	}

	return ret;
}


static int wpa_driver_nl80211_pmksa(struct wpa_driver_nl80211_data *drv,
				 u32 cmd, const u8 *bssid, const u8 *pmkid)
{
	struct iwreq iwr;
	struct iw_pmksa pmksa;
	int ret = 0;

	os_memset(&iwr, 0, sizeof(iwr));
	os_strlcpy(iwr.ifr_name, drv->ifname, IFNAMSIZ);
	os_memset(&pmksa, 0, sizeof(pmksa));
	pmksa.cmd = cmd;
	pmksa.bssid.sa_family = ARPHRD_ETHER;
	if (bssid)
		os_memcpy(pmksa.bssid.sa_data, bssid, ETH_ALEN);
	if (pmkid)
		os_memcpy(pmksa.pmkid, pmkid, IW_PMKID_LEN);
	iwr.u.data.pointer = (caddr_t) &pmksa;
	iwr.u.data.length = sizeof(pmksa);

	if (ioctl(drv->ioctl_sock, SIOCSIWPMKSA, &iwr) < 0) {
		if (errno != EOPNOTSUPP)
			perror("ioctl[SIOCSIWPMKSA]");
		ret = -1;
	}

	return ret;
}


static int wpa_driver_nl80211_add_pmkid(void *priv, const u8 *bssid,
				     const u8 *pmkid)
{
	struct wpa_driver_nl80211_data *drv = priv;
	return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_ADD, bssid, pmkid);
}


static int wpa_driver_nl80211_remove_pmkid(void *priv, const u8 *bssid,
		 			const u8 *pmkid)
{
	struct wpa_driver_nl80211_data *drv = priv;
	return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_REMOVE, bssid, pmkid);
}


static int wpa_driver_nl80211_flush_pmkid(void *priv)
{
	struct wpa_driver_nl80211_data *drv = priv;
	return wpa_driver_nl80211_pmksa(drv, IW_PMKSA_FLUSH, NULL, NULL);
}


static int wpa_driver_nl80211_get_capa(void *priv,
				       struct wpa_driver_capa *capa)
{
	struct wpa_driver_nl80211_data *drv = priv;
	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 wpa_driver_nl80211_data *drv = priv;

	wpa_printf(MSG_DEBUG, "%s: operstate %d->%d (%s)",
		   __func__, drv->operstate, state, state ? "UP" : "DORMANT");
	drv->operstate = state;
	return wpa_driver_nl80211_send_oper_ifla(
		drv, -1, state ? IF_OPER_UP : IF_OPER_DORMANT);
}


#ifdef CONFIG_CLIENT_MLME
static int wpa_driver_nl80211_open_mlme(struct wpa_driver_nl80211_data *drv)
{
	if (wpa_driver_nl80211_set_userspace_mlme(drv, 1) < 0) {
		wpa_printf(MSG_ERROR, "nl80211: Failed to enable userspace "
			   "MLME");
		return -1;
	}
	if (wpa_driver_nl80211_create_monitor_interface(drv)) {
		wpa_printf(MSG_ERROR, "nl80211: Failed to create monitor "
			   "interface");
		return -1;
	}
	return 0;
}
#endif /* CONFIG_CLIENT_MLME */


static int wpa_driver_nl80211_set_param(void *priv, const char *param)
{
#ifdef CONFIG_CLIENT_MLME
	struct wpa_driver_nl80211_data *drv = priv;

	if (param == NULL)
		return 0;

	wpa_printf(MSG_DEBUG, "%s: param='%s'", __func__, param);

	if (os_strstr(param, "use_mlme=1")) {
		wpa_printf(MSG_DEBUG, "nl80211: Using user space MLME");
		drv->capa.flags |= WPA_DRIVER_FLAGS_USER_SPACE_MLME;

		if (wpa_driver_nl80211_open_mlme(drv))
			return -1;
	}
#endif /* CONFIG_CLIENT_MLME */

	return 0;
}


#ifdef CONFIG_CLIENT_MLME

struct phy_info_arg {
	u16 *num_modes;
	struct wpa_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 },
	};

	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 wpa_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)];
		os_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);

		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 wpa_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 |= WPA_CHAN_W_SCAN |
				WPA_CHAN_W_ACTIVE_SCAN |
				WPA_CHAN_W_IBSS;

			if (!mode_is_set) {
				/* crude heuristic */
				if (mode->channels[idx].freq < 4000)
					mode->mode = WPA_MODE_IEEE80211B;
				else
					mode->mode = WPA_MODE_IEEE80211A;
				mode_is_set = 1;
			}

			/* crude heuristic */
			if (mode->channels[idx].freq < 4000) {
				if (mode->channels[idx].freq == 2848)
					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 &= ~WPA_CHAN_W_SCAN;
			if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
				mode->channels[idx].flag &=
					~WPA_CHAN_W_ACTIVE_SCAN;
			if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
				mode->channels[idx].flag &= ~WP