join.c

linux 内核源代码

/**
  *  Functions implementing wlan infrastructure and adhoc join routines,
  *  IOCTL handlers as well as command preperation and response routines
  *  for sending adhoc start, adhoc join, and association commands
  *  to the firmware.
  */
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>

#include <net/iw_handler.h>

#include "host.h"
#include "decl.h"
#include "join.h"
#include "dev.h"
#include "assoc.h"

/* The firmware needs certain bits masked out of the beacon-derviced capability
 * field when associating/joining to BSSs.
 */
#define CAPINFO_MASK	(~(0xda00))

/**
 *  @brief This function finds common rates between rate1 and card rates.
 *
 * It will fill common rates in rate1 as output if found.
 *
 * NOTE: Setting the MSB of the basic rates need to be taken
 *   care, either before or after calling this function
 *
 *  @param adapter     A pointer to wlan_adapter structure
 *  @param rate1       the buffer which keeps input and output
 *  @param rate1_size  the size of rate1 buffer; new size of buffer on return
 *
 *  @return            0 or -1
 */
static int get_common_rates(wlan_adapter * adapter, u8 * rates, u16 *rates_size)
{
	u8 *card_rates = libertas_bg_rates;
	size_t num_card_rates = sizeof(libertas_bg_rates);
	int ret = 0, i, j;
	u8 tmp[30];
	size_t tmp_size = 0;

	/* For each rate in card_rates that exists in rate1, copy to tmp */
	for (i = 0; card_rates[i] && (i < num_card_rates); i++) {
		for (j = 0; rates[j] && (j < *rates_size); j++) {
			if (rates[j] == card_rates[i])
				tmp[tmp_size++] = card_rates[i];
		}
	}

	lbs_deb_hex(LBS_DEB_JOIN, "AP rates    ", rates, *rates_size);
	lbs_deb_hex(LBS_DEB_JOIN, "card rates  ", card_rates, num_card_rates);
	lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size);
	lbs_deb_join("Tx datarate is currently 0x%X\n", adapter->cur_rate);

	if (!adapter->auto_rate) {
		for (i = 0; i < tmp_size; i++) {
			if (tmp[i] == adapter->cur_rate)
				goto done;
		}
		lbs_pr_alert("Previously set fixed data rate %#x isn't "
		       "compatible with the network.\n", adapter->cur_rate);
		ret = -1;
		goto done;
	}
	ret = 0;

done:
	memset(rates, 0, *rates_size);
	*rates_size = min_t(int, tmp_size, *rates_size);
	memcpy(rates, tmp, *rates_size);
	return ret;
}


/**
 *  @brief Sets the MSB on basic rates as the firmware requires
 *
 * Scan through an array and set the MSB for basic data rates.
 *
 *  @param rates     buffer of data rates
 *  @param len       size of buffer
 */
static void libertas_set_basic_rate_flags(u8 * rates, size_t len)
{
	int i;

	for (i = 0; i < len; i++) {
		if (rates[i] == 0x02 || rates[i] == 0x04 ||
		    rates[i] == 0x0b || rates[i] == 0x16)
			rates[i] |= 0x80;
	}
}

/**
 *  @brief Unsets the MSB on basic rates
 *
 * Scan through an array and unset the MSB for basic data rates.
 *
 *  @param rates     buffer of data rates
 *  @param len       size of buffer
 */
void libertas_unset_basic_rate_flags(u8 * rates, size_t len)
{
	int i;

	for (i = 0; i < len; i++)
		rates[i] &= 0x7f;
}


/**
 *  @brief Associate to a specific BSS discovered in a scan
 *
 *  @param priv      A pointer to wlan_private structure
 *  @param pbssdesc  Pointer to the BSS descriptor to associate with.
 *
 *  @return          0-success, otherwise fail
 */
int wlan_associate(wlan_private * priv, struct assoc_request * assoc_req)
{
	wlan_adapter *adapter = priv->adapter;
	int ret;

	lbs_deb_enter(LBS_DEB_JOIN);

	ret = libertas_prepare_and_send_command(priv, CMD_802_11_AUTHENTICATE,
				    0, CMD_OPTION_WAITFORRSP,
				    0, assoc_req->bss.bssid);

	if (ret)
		goto done;

	/* set preamble to firmware */
	if (   (adapter->capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
	    && (assoc_req->bss.capability & WLAN_CAPABILITY_SHORT_PREAMBLE))
		adapter->preamble = CMD_TYPE_SHORT_PREAMBLE;
	else
		adapter->preamble = CMD_TYPE_LONG_PREAMBLE;

	libertas_set_radio_control(priv);

	ret = libertas_prepare_and_send_command(priv, CMD_802_11_ASSOCIATE,
				    0, CMD_OPTION_WAITFORRSP, 0, assoc_req);

done:
	lbs_deb_leave_args(LBS_DEB_JOIN, "ret %d", ret);
	return ret;
}

/**
 *  @brief Start an Adhoc Network
 *
 *  @param priv         A pointer to wlan_private structure
 *  @param adhocssid    The ssid of the Adhoc Network
 *  @return             0--success, -1--fail
 */
int libertas_start_adhoc_network(wlan_private * priv, struct assoc_request * assoc_req)
{
	wlan_adapter *adapter = priv->adapter;
	int ret = 0;

	adapter->adhoccreate = 1;

	if (adapter->capability & WLAN_CAPABILITY_SHORT_PREAMBLE) {
		lbs_deb_join("AdhocStart: Short preamble\n");
		adapter->preamble = CMD_TYPE_SHORT_PREAMBLE;
	} else {
		lbs_deb_join("AdhocStart: Long preamble\n");
		adapter->preamble = CMD_TYPE_LONG_PREAMBLE;
	}

	libertas_set_radio_control(priv);

	lbs_deb_join("AdhocStart: channel = %d\n", assoc_req->channel);
	lbs_deb_join("AdhocStart: band = %d\n", assoc_req->band);

	ret = libertas_prepare_and_send_command(priv, CMD_802_11_AD_HOC_START,
				    0, CMD_OPTION_WAITFORRSP, 0, assoc_req);

	return ret;
}

/**
 *  @brief Join an adhoc network found in a previous scan
 *
 *  @param priv         A pointer to wlan_private structure
 *  @param pbssdesc     Pointer to a BSS descriptor found in a previous scan
 *                      to attempt to join
 *
 *  @return             0--success, -1--fail
 */
int libertas_join_adhoc_network(wlan_private * priv, struct assoc_request * assoc_req)
{
	wlan_adapter *adapter = priv->adapter;
	struct bss_descriptor * bss = &assoc_req->bss;
	int ret = 0;

	lbs_deb_join("%s: Current SSID '%s', ssid length %u\n",
	             __func__,
	             escape_essid(adapter->curbssparams.ssid,
	                          adapter->curbssparams.ssid_len),
	             adapter->curbssparams.ssid_len);
	lbs_deb_join("%s: requested ssid '%s', ssid length %u\n",
	             __func__, escape_essid(bss->ssid, bss->ssid_len),
	             bss->ssid_len);

	/* check if the requested SSID is already joined */
	if (   adapter->curbssparams.ssid_len
	    && !libertas_ssid_cmp(adapter->curbssparams.ssid,
	                          adapter->curbssparams.ssid_len,
	                          bss->ssid, bss->ssid_len)
	    && (adapter->mode == IW_MODE_ADHOC)
	    && (adapter->connect_status == LIBERTAS_CONNECTED)) {
		union iwreq_data wrqu;

		lbs_deb_join("ADHOC_J_CMD: New ad-hoc SSID is the same as "
		             "current, not attempting to re-join");

		/* Send the re-association event though, because the association
		 * request really was successful, even if just a null-op.
		 */
		memset(&wrqu, 0, sizeof(wrqu));
		memcpy(wrqu.ap_addr.sa_data, adapter->curbssparams.bssid,
		       ETH_ALEN);
		wrqu.ap_addr.sa_family = ARPHRD_ETHER;
		wireless_send_event(priv->dev, SIOCGIWAP, &wrqu, NULL);
		goto out;
	}

	/* Use shortpreamble only when both creator and card supports
	   short preamble */
	if (   !(bss->capability & WLAN_CAPABILITY_SHORT_PREAMBLE)
	    || !(adapter->capability & WLAN_CAPABILITY_SHORT_PREAMBLE)) {
		lbs_deb_join("AdhocJoin: Long preamble\n");
		adapter->preamble = CMD_TYPE_LONG_PREAMBLE;
	} else {
		lbs_deb_join("AdhocJoin: Short preamble\n");
		adapter->preamble = CMD_TYPE_SHORT_PREAMBLE;
	}

	libertas_set_radio_control(priv);

	lbs_deb_join("AdhocJoin: channel = %d\n", assoc_req->channel);
	lbs_deb_join("AdhocJoin: band = %c\n", assoc_req->band);

	adapter->adhoccreate = 0;

	ret = libertas_prepare_and_send_command(priv, CMD_802_11_AD_HOC_JOIN,
				    0, CMD_OPTION_WAITFORRSP,
				    OID_802_11_SSID, assoc_req);

out:
	return ret;
}

int libertas_stop_adhoc_network(wlan_private * priv)
{
	return libertas_prepare_and_send_command(priv, CMD_802_11_AD_HOC_STOP,
				     0, CMD_OPTION_WAITFORRSP, 0, NULL);
}

/**
 *  @brief Send Deauthentication Request
 *
 *  @param priv      A pointer to wlan_private structure
 *  @return          0--success, -1--fail
 */
int libertas_send_deauthentication(wlan_private * priv)
{
	return libertas_prepare_and_send_command(priv, CMD_802_11_DEAUTHENTICATE,
				     0, CMD_OPTION_WAITFORRSP, 0, NULL);
}

/**
 *  @brief This function prepares command of authenticate.
 *
 *  @param priv      A pointer to wlan_private structure
 *  @param cmd       A pointer to cmd_ds_command structure
 *  @param pdata_buf Void cast of pointer to a BSSID to authenticate with
 *
 *  @return         0 or -1
 */
int libertas_cmd_80211_authenticate(wlan_private * priv,
				 struct cmd_ds_command *cmd,
				 void *pdata_buf)
{
	wlan_adapter *adapter = priv->adapter;
	struct cmd_ds_802_11_authenticate *pauthenticate = &cmd->params.auth;
	int ret = -1;
	u8 *bssid = pdata_buf;
	DECLARE_MAC_BUF(mac);

	lbs_deb_enter(LBS_DEB_JOIN);

	cmd->command = cpu_to_le16(CMD_802_11_AUTHENTICATE);
	cmd->size = cpu_to_le16(sizeof(struct cmd_ds_802_11_authenticate)
	                        + S_DS_GEN);

	/* translate auth mode to 802.11 defined wire value */
	switch (adapter->secinfo.auth_mode) {
	case IW_AUTH_ALG_OPEN_SYSTEM:
		pauthenticate->authtype = 0x00;
		break;
	case IW_AUTH_ALG_SHARED_KEY:
		pauthenticate->authtype = 0x01;
		break;
	case IW_AUTH_ALG_LEAP:
		pauthenticate->authtype = 0x80;
		break;
	default:
		lbs_deb_join("AUTH_CMD: invalid auth alg 0x%X\n",
		             adapter->secinfo.auth_mode);
		goto out;
	}

	memcpy(pauthenticate->macaddr, bssid, ETH_ALEN);

	lbs_deb_join("AUTH_CMD: BSSID is : %s auth=0x%X\n",
	             print_mac(mac, bssid), pauthenticate->authtype);
	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_JOIN, "ret %d", ret);
	return ret;
}

int libertas_cmd_80211_deauthenticate(wlan_private * priv,
				   struct cmd_ds_command *cmd)
{
	wlan_adapter *adapter = priv->adapter;
	struct cmd_ds_802_11_deauthenticate *dauth = &cmd->params.deauth;

	lbs_deb_enter(LBS_DEB_JOIN);

	cmd->command = cpu_to_le16(CMD_802_11_DEAUTHENTICATE);
	cmd->size = cpu_to_le16(sizeof(struct cmd_ds_802_11_deauthenticate) +
			     S_DS_GEN);

	/* set AP MAC address */
	memmove(dauth->macaddr, adapter->curbssparams.bssid, ETH_ALEN);

	/* Reason code 3 = Station is leaving */
#define REASON_CODE_STA_LEAVING 3
	dauth->reasoncode = cpu_to_le16(REASON_CODE_STA_LEAVING);

	lbs_deb_leave(LBS_DEB_JOIN);
	return 0;
}

int libertas_cmd_80211_associate(wlan_private * priv,
			      struct cmd_ds_command *cmd, void *pdata_buf)
{
	wlan_adapter *adapter = priv->adapter;
	struct cmd_ds_802_11_associate *passo = &cmd->params.associate;
	int ret = 0;
	struct assoc_request * assoc_req = pdata_buf;
	struct bss_descriptor * bss = &assoc_req->bss;
	u8 *pos;
	u16 tmpcap, tmplen;
	struct mrvlietypes_ssidparamset *ssid;
	struct mrvlietypes_phyparamset *phy;
	struct mrvlietypes_ssparamset *ss;
	struct mrvlietypes_ratesparamset *rates;
	struct mrvlietypes_rsnparamset *rsn;

	lbs_deb_enter(LBS_DEB_JOIN);

	pos = (u8 *) passo;

	if (!adapter) {
		ret = -1;
		goto done;
	}

	cmd->command = cpu_to_le16(CMD_802_11_ASSOCIATE);

	memcpy(passo->peerstaaddr, bss->bssid, sizeof(passo->peerstaaddr));
	pos += sizeof(passo->peerstaaddr);

	/* set the listen interval */
	passo->listeninterval = cpu_to_le16(MRVDRV_DEFAULT_LISTEN_INTERVAL);

	pos += sizeof(passo->capability);
	pos += sizeof(passo->listeninterval);
	pos += sizeof(passo->bcnperiod);
	pos += sizeof(passo->dtimperiod);

	ssid = (struct mrvlietypes_ssidparamset *) pos;
	ssid->header.type = cpu_to_le16(TLV_TYPE_SSID);
	tmplen = bss->ssid_len;
	ssid->header.len = cpu_to_le16(tmplen);
	memcpy(ssid->ssid, bss->ssid, tmplen);
	pos += sizeof(ssid->header) + tmplen;

	phy = (struct mrvlietypes_phyparamset *) pos;
	phy->header.type = cpu_to_le16(TLV_TYPE_PHY_DS);
	tmplen = sizeof(phy->fh_ds.dsparamset);
	phy->header.len = cpu_to_le16(tmplen);
	memcpy(&phy->fh_ds.dsparamset,
	       &bss->phyparamset.dsparamset.currentchan,
	       tmplen);
	pos += sizeof(phy->header) + tmplen;

	ss = (struct mrvlietypes_ssparamset *) pos;
	ss->header.type = cpu_to_le16(TLV_TYPE_CF);
	tmplen = sizeof(ss->cf_ibss.cfparamset);
	ss->header.len = cpu_to_le16(tmplen);
	pos += sizeof(ss->header) + tmplen;

	rates = (struct mrvlietypes_ratesparamset *) pos;
	rates->header.type = cpu_to_le16(TLV_TYPE_RATES);
	memcpy(&rates->rates, &bss->rates, MAX_RATES);
	tmplen = MAX_RATES;
	if (get_common_rates(adapter, rates->rates, &tmplen)) {
		ret = -1;
		goto done;
	}
	pos += sizeof(rates->header) + tmplen;
	rates->header.len = cpu_to_le16(tmplen);
	lbs_deb_join("ASSOC_CMD: num rates = %u\n", tmplen);

	/* Copy the infra. association rates into Current BSS state structure */
	memset(&adapter->curbssparams.rates, 0, sizeof(adapter->curbssparams.rates));
	memcpy(&adapter->curbssparams.rates, &rates->rates, tmplen);

	/* Set MSB on basic rates as the firmware requires, but _after_
	 * copying to current bss rates.
	 */
	libertas_set_basic_rate_flags(rates->rates, tmplen);

	if (assoc_req->secinfo.WPAenabled || assoc_req->secinfo.WPA2enabled) {
		rsn = (struct mrvlietypes_rsnparamset *) pos;
		/* WPA_IE or WPA2_IE */
		rsn->header.type = cpu_to_le16((u16) assoc_req->wpa_ie[0]);
		tmplen = (u16) assoc_req->wpa_ie[1];
		rsn->header.len = cpu_to_le16(tmplen);
		memcpy(rsn->rsnie, &assoc_req->wpa_ie[2], tmplen);
		lbs_deb_hex(LBS_DEB_JOIN, "ASSOC_CMD: RSN IE", (u8 *) rsn,
			sizeof(rsn->header) + tmplen);
		pos += sizeof(rsn->header) + tmplen;
	}

	/* update curbssparams */
	adapter->curbssparams.channel = bss->phyparamset.dsparamset.currentchan;

	if (libertas_parse_dnld_countryinfo_11d(priv, bss)) {
		ret = -1;
		goto done;
	}

	cmd->size = cpu_to_le16((u16) (pos - (u8 *) passo) + S_DS_GEN);

	/* set the capability info */
	tmpcap = (bss->capability & CAPINFO_MASK);