ie.c

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/*
 * Marvell Wireless LAN device driver: management IE handling- setting and
 * deleting IE.
 *
 * Copyright (C) 2012, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "main.h"

/* This function checks if current IE index is used by any on other interface.
 * Return: -1: yes, current IE index is used by someone else.
 *          0: no, current IE index is NOT used by other interface.
 */
static int
mwifiex_ie_index_used_by_other_intf(struct mwifiex_private *priv, u16 idx)
{
    int i;
    struct mwifiex_adapter *adapter = priv->adapter;
    struct mwifiex_ie *ie;

    for (i = 0; i < adapter->priv_num; i++) {
        if (adapter->priv[i] != priv) {
            ie = &adapter->priv[i]->mgmt_ie[idx];
            if (ie->mgmt_subtype_mask && ie->ie_length)
                return -1;
        }
    }

    return 0;
}

/* Get unused IE index. This index will be used for setting new IE */
static int
mwifiex_ie_get_autoidx(struct mwifiex_private *priv, u16 subtype_mask,
               struct mwifiex_ie *ie, u16 *index)
{
    u16 mask, len, i;

    for (i = 0; i < priv->adapter->max_mgmt_ie_index; i++) {
        mask = le16_to_cpu(priv->mgmt_ie[i].mgmt_subtype_mask);
        len = le16_to_cpu(ie->ie_length);

        if (mask == MWIFIEX_AUTO_IDX_MASK)
            continue;

        if (mask == subtype_mask) {
            if (len > IEEE_MAX_IE_SIZE)
                continue;

            *index = i;
            return 0;
        }

        if (!priv->mgmt_ie[i].ie_length) {
            if (mwifiex_ie_index_used_by_other_intf(priv, i))
                continue;

            *index = i;
            return 0;
        }
    }

    return -1;
}

/* This function prepares IE data buffer for command to be sent to FW */
static int
mwifiex_update_autoindex_ies(struct mwifiex_private *priv,
                 struct mwifiex_ie_list *ie_list)
{
    u16 travel_len, index, mask;
    s16 input_len;
    struct mwifiex_ie *ie;
    u8 *tmp;

    input_len = le16_to_cpu(ie_list->len);
    travel_len = sizeof(struct host_cmd_tlv);

    ie_list->len = 0;

    while (input_len > 0) {
        ie = (struct mwifiex_ie *)(((u8 *)ie_list) + travel_len);
        input_len -= le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;
        travel_len += le16_to_cpu(ie->ie_length) + MWIFIEX_IE_HDR_SIZE;

        index = le16_to_cpu(ie->ie_index);
        mask = le16_to_cpu(ie->mgmt_subtype_mask);

        if (index == MWIFIEX_AUTO_IDX_MASK) {
            /* automatic addition */
            if (mwifiex_ie_get_autoidx(priv, mask, ie, &index))
                return -1;
            if (index == MWIFIEX_AUTO_IDX_MASK)
                return -1;

            tmp = (u8 *)&priv->mgmt_ie[index].ie_buffer;
            memcpy(tmp, &ie->ie_buffer, le16_to_cpu(ie->ie_length));
            priv->mgmt_ie[index].ie_length = ie->ie_length;
            priv->mgmt_ie[index].ie_index = cpu_to_le16(index);
            priv->mgmt_ie[index].mgmt_subtype_mask =
                            cpu_to_le16(mask);

            ie->ie_index = cpu_to_le16(index);
        } else {
            if (mask != MWIFIEX_DELETE_MASK)
                return -1;
            /*
             * Check if this index is being used on any
             * other interface.
             */
            if (mwifiex_ie_index_used_by_other_intf(priv, index))
                return -1;

            ie->ie_length = 0;
            memcpy(&priv->mgmt_ie[index], ie,
                   sizeof(struct mwifiex_ie));
        }

        le16_add_cpu(&ie_list->len,
                 le16_to_cpu(priv->mgmt_ie[index].ie_length) +
                 MWIFIEX_IE_HDR_SIZE);
    }

    if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_UAP)
        return mwifiex_send_cmd_async(priv, HostCmd_CMD_UAP_SYS_CONFIG,
                          HostCmd_ACT_GEN_SET,
                          UAP_CUSTOM_IE_I, ie_list);

    return 0;
}

/* Copy individual custom IEs for beacon, probe response and assoc response
 * and prepare single structure for IE setting.
 * This function also updates allocated IE indices from driver.
 */
static int
mwifiex_update_uap_custom_ie(struct mwifiex_private *priv,
                 struct mwifiex_ie *beacon_ie, u16 *beacon_idx,
                 struct mwifiex_ie *pr_ie, u16 *probe_idx,
                 struct mwifiex_ie *ar_ie, u16 *assoc_idx)
{
    struct mwifiex_ie_list *ap_custom_ie;
    u8 *pos;
    u16 len;
    int ret;

    ap_custom_ie = kzalloc(sizeof(*ap_custom_ie), GFP_KERNEL);
    if (!ap_custom_ie)
        return -ENOMEM;

    ap_custom_ie->type = cpu_to_le16(TLV_TYPE_MGMT_IE);
    pos = (u8 *)ap_custom_ie->ie_list;

    if (beacon_ie) {
        len = sizeof(struct mwifiex_ie) - IEEE_MAX_IE_SIZE +
              le16_to_cpu(beacon_ie->ie_length);
        memcpy(pos, beacon_ie, len);
        pos += len;
        le16_add_cpu(&ap_custom_ie->len, len);
    }
    if (pr_ie) {
        len = sizeof(struct mwifiex_ie) - IEEE_MAX_IE_SIZE +
              le16_to_cpu(pr_ie->ie_length);
        memcpy(pos, pr_ie, len);
        pos += len;
        le16_add_cpu(&ap_custom_ie->len, len);
    }
    if (ar_ie) {
        len = sizeof(struct mwifiex_ie) - IEEE_MAX_IE_SIZE +
              le16_to_cpu(ar_ie->ie_length);
        memcpy(pos, ar_ie, len);
        pos += len;
        le16_add_cpu(&ap_custom_ie->len, len);
    }

    ret = mwifiex_update_autoindex_ies(priv, ap_custom_ie);

    pos = (u8 *)(&ap_custom_ie->ie_list[0].ie_index);
    if (beacon_ie && *beacon_idx == MWIFIEX_AUTO_IDX_MASK) {
        /* save beacon ie index after auto-indexing */
        *beacon_idx = le16_to_cpu(ap_custom_ie->ie_list[0].ie_index);
        len = sizeof(*beacon_ie) - IEEE_MAX_IE_SIZE +
              le16_to_cpu(beacon_ie->ie_length);
        pos += len;
    }
    if (pr_ie && le16_to_cpu(pr_ie->ie_index) == MWIFIEX_AUTO_IDX_MASK) {
        /* save probe resp ie index after auto-indexing */
        *probe_idx = *((u16 *)pos);
        len = sizeof(*pr_ie) - IEEE_MAX_IE_SIZE +
              le16_to_cpu(pr_ie->ie_length);
        pos += len;
    }
    if (ar_ie && le16_to_cpu(ar_ie->ie_index) == MWIFIEX_AUTO_IDX_MASK)
        /* save assoc resp ie index after auto-indexing */
        *assoc_idx = *((u16 *)pos);

    kfree(ap_custom_ie);
    return ret;
}

/* This function checks if the vendor specified IE is present in passed buffer
 * and copies it to mwifiex_ie structure.
 * Function takes pointer to struct mwifiex_ie pointer as argument.
 * If the vendor specified IE is present then memory is allocated for
 * mwifiex_ie pointer and filled in with IE. Caller should take care of freeing
 * this memory.
 */
static int mwifiex_update_vs_ie(const u8 *ies, int ies_len,
                struct mwifiex_ie **ie_ptr, u16 mask,
                unsigned int oui, u8 oui_type)
{
    struct ieee_types_header *vs_ie;
    struct mwifiex_ie *ie = *ie_ptr;
    const u8 *vendor_ie;

    vendor_ie = cfg80211_find_vendor_ie(oui, oui_type, ies, ies_len);
    if (vendor_ie) {
        if (!*ie_ptr) {
            *ie_ptr = kzalloc(sizeof(struct mwifiex_ie),
                      GFP_KERNEL);
            if (!*ie_ptr)
                return -ENOMEM;
            ie = *ie_ptr;
        }

        vs_ie = (struct ieee_types_header *)vendor_ie;
        memcpy(ie->ie_buffer + le16_to_cpu(ie->ie_length),
               vs_ie, vs_ie->len + 2);
        le16_add_cpu(&ie->ie_length, vs_ie->len + 2);
        ie->mgmt_subtype_mask = cpu_to_le16(mask);
        ie->ie_index = cpu_to_le16(MWIFIEX_AUTO_IDX_MASK);
    }

    *ie_ptr = ie;
    return 0;
}

/* This function parses beacon IEs, probe response IEs, association response IEs
 * from cfg80211_ap_settings->beacon and sets these IE to FW.
 */
static int mwifiex_set_mgmt_beacon_data_ies(struct mwifiex_private *priv,
                        struct cfg80211_beacon_data *data)
{
    struct mwifiex_ie *beacon_ie = NULL, *pr_ie = NULL, *ar_ie = NULL;
    u16 beacon_idx = MWIFIEX_AUTO_IDX_MASK, pr_idx = MWIFIEX_AUTO_IDX_MASK;
    u16 ar_idx = MWIFIEX_AUTO_IDX_MASK;
    int ret = 0;

    if (data->beacon_ies && data->beacon_ies_len) {
        mwifiex_update_vs_ie(data->beacon_ies, data->beacon_ies_len,
                     &beacon_ie, MGMT_MASK_BEACON,
                     WLAN_OUI_MICROSOFT,
                     WLAN_OUI_TYPE_MICROSOFT_WPS);
        mwifiex_update_vs_ie(data->beacon_ies, data->beacon_ies_len,
                     &beacon_ie, MGMT_MASK_BEACON,
                     WLAN_OUI_WFA, WLAN_OUI_TYPE_WFA_P2P);
    }

    if (data->proberesp_ies && data->proberesp_ies_len) {
        mwifiex_update_vs_ie(data->proberesp_ies,
                     data->proberesp_ies_len, &pr_ie,
                     MGMT_MASK_PROBE_RESP, WLAN_OUI_MICROSOFT,
                     WLAN_OUI_TYPE_MICROSOFT_WPS);
        mwifiex_update_vs_ie(data->proberesp_ies,
                     data->proberesp_ies_len, &pr_ie,
                     MGMT_MASK_PROBE_RESP,
                     WLAN_OUI_WFA, WLAN_OUI_TYPE_WFA_P2P);
    }

    if (data->assocresp_ies && data->assocresp_ies_len) {
        mwifiex_update_vs_ie(data->assocresp_ies,
                     data->assocresp_ies_len, &ar_ie,
                     MGMT_MASK_ASSOC_RESP |
                     MGMT_MASK_REASSOC_RESP,
                     WLAN_OUI_MICROSOFT,
                     WLAN_OUI_TYPE_MICROSOFT_WPS);
        mwifiex_update_vs_ie(data->assocresp_ies,
                     data->assocresp_ies_len, &ar_ie,
                     MGMT_MASK_ASSOC_RESP |
                     MGMT_MASK_REASSOC_RESP, WLAN_OUI_WFA,
                     WLAN_OUI_TYPE_WFA_P2P);
    }

    if (beacon_ie || pr_ie || ar_ie) {
        ret = mwifiex_update_uap_custom_ie(priv, beacon_ie,
                           &beacon_idx, pr_ie,
                           &pr_idx, ar_ie, &ar_idx);
        if (ret)
            goto done;
    }

    priv->beacon_idx = beacon_idx;
    priv->proberesp_idx = pr_idx;
    priv->assocresp_idx = ar_idx;

done:
    kfree(beacon_ie);
    kfree(pr_ie);
    kfree(ar_ie);

    return ret;
}

/* This function parses different IEs-tail IEs, beacon IEs, probe response IEs,
 * association response IEs from cfg80211_ap_settings function and sets these IE
 * to FW.
 */
int mwifiex_set_mgmt_ies(struct mwifiex_private *priv,
             struct cfg80211_beacon_data *info)
{
    struct mwifiex_ie *gen_ie;
    struct ieee_types_header *rsn_ie, *wpa_ie = NULL;
    u16 rsn_idx = MWIFIEX_AUTO_IDX_MASK, ie_len = 0;
    const u8 *vendor_ie;

    if (info->tail && info->tail_len) {
        gen_ie = kzalloc(sizeof(struct mwifiex_ie), GFP_KERNEL);
        if (!gen_ie)
            return -ENOMEM;
        gen_ie->ie_index = cpu_to_le16(rsn_idx);
        gen_ie->mgmt_subtype_mask = cpu_to_le16(MGMT_MASK_BEACON |
                            MGMT_MASK_PROBE_RESP |
                            MGMT_MASK_ASSOC_RESP);

        rsn_ie = (void *)cfg80211_find_ie(WLAN_EID_RSN,
                          info->tail, info->tail_len);
        if (rsn_ie) {
            memcpy(gen_ie->ie_buffer, rsn_ie, rsn_ie->len + 2);
            ie_len = rsn_ie->len + 2;
            gen_ie->ie_length = cpu_to_le16(ie_len);
        }

        vendor_ie = cfg80211_find_vendor_ie(WLAN_OUI_MICROSOFT,
                            WLAN_OUI_TYPE_MICROSOFT_WPA,
                            info->tail,
                            info->tail_len);
        if (vendor_ie) {
            wpa_ie = (struct ieee_types_header *)vendor_ie;
            memcpy(gen_ie->ie_buffer + ie_len,
                   wpa_ie, wpa_ie->len + 2);
            ie_len += wpa_ie->len + 2;
            gen_ie->ie_length = cpu_to_le16(ie_len);
        }

        if (rsn_ie || wpa_ie) {
            if (mwifiex_update_uap_custom_ie(priv, gen_ie, &rsn_idx,
                             NULL, NULL,
                             NULL, NULL)) {
                kfree(gen_ie);
                return -1;
            }
            priv->rsn_idx = rsn_idx;
        }

        kfree(gen_ie);
    }

    return mwifiex_set_mgmt_beacon_data_ies(priv, info);
}

/* This function removes management IE set */
int mwifiex_del_mgmt_ies(struct mwifiex_private *priv)
{
    struct mwifiex_ie *beacon_ie = NULL, *pr_ie = NULL;
    struct mwifiex_ie *ar_ie = NULL, *rsn_ie = NULL;
    int ret = 0;

    if (priv->rsn_idx != MWIFIEX_AUTO_IDX_MASK) {
        rsn_ie = kmalloc(sizeof(struct mwifiex_ie), GFP_KERNEL);
        if (!rsn_ie)
            return -ENOMEM;

        rsn_ie->ie_index = cpu_to_le16(priv->rsn_idx);
        rsn_ie->mgmt_subtype_mask = cpu_to_le16(MWIFIEX_DELETE_MASK);
        rsn_ie->ie_length = 0;
        if (mwifiex_update_uap_custom_ie(priv, rsn_ie, &priv->rsn_idx,
                         NULL, &priv->proberesp_idx,
                         NULL, &priv->assocresp_idx)) {
            ret = -1;
            goto done;
        }

        priv->rsn_idx = MWIFIEX_AUTO_IDX_MASK;
    }

    if (priv->beacon_idx != MWIFIEX_AUTO_IDX_MASK) {
        beacon_ie = kmalloc(sizeof(struct mwifiex_ie), GFP_KERNEL);
        if (!beacon_ie) {
            ret = -ENOMEM;
            goto done;
        }
        beacon_ie->ie_index = cpu_to_le16(priv->beacon_idx);
        beacon_ie->mgmt_subtype_mask = cpu_to_le16(MWIFIEX_DELETE_MASK);
        beacon_ie->ie_length = 0;
    }
    if (priv->proberesp_idx != MWIFIEX_AUTO_IDX_MASK) {
        pr_ie = kmalloc(sizeof(struct mwifiex_ie), GFP_KERNEL);
        if (!pr_ie) {
            ret = -ENOMEM;
            goto done;
        }
        pr_ie->ie_index = cpu_to_le16(priv->proberesp_idx);
        pr_ie->mgmt_subtype_mask = cpu_to_le16(MWIFIEX_DELETE_MASK);
        pr_ie->ie_length = 0;
    }
    if (priv->assocresp_idx != MWIFIEX_AUTO_IDX_MASK) {
        ar_ie = kmalloc(sizeof(struct mwifiex_ie), GFP_KERNEL);
        if (!ar_ie) {
            ret = -ENOMEM;
            goto done;
        }
        ar_ie->ie_index = cpu_to_le16(priv->assocresp_idx);
        ar_ie->mgmt_subtype_mask = cpu_to_le16(MWIFIEX_DELETE_MASK);
        ar_ie->ie_length = 0;
    }

    if (beacon_ie || pr_ie || ar_ie)
        ret = mwifiex_update_uap_custom_ie(priv,
                           beacon_ie, &priv->beacon_idx,
                           pr_ie, &priv->proberesp_idx,
                           ar_ie, &priv->assocresp_idx);

done:
    kfree(beacon_ie);
    kfree(pr_ie);
    kfree(ar_ie);
    kfree(rsn_ie);

    return ret;
}