hostap.c

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/*
 * Host AP (software wireless LAN access point) driver for
 * Intersil Prism2/2.5/3 - hostap.o module, common routines
 *
 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
 * <jkmaline@cc.hut.fi>
 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. See README and COPYING for
 * more details.
 */

#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif

#include <linux/config.h>
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/if_arp.h>
#include <linux/delay.h>
#include <linux/random.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,44))
#include <linux/tqueue.h>
#else
#include <linux/workqueue.h>
#endif
#include <linux/kmod.h>
#include <linux/rtnetlink.h>
#include "hostap_wext.h"
#include <asm/uaccess.h>

#include "hostap_wlan.h"
#include "hostap_80211.h"
#include "hostap_ap.h"
#include "hostap.h"
#include "hostap_crypt.h"

MODULE_AUTHOR("Jouni Malinen");
MODULE_DESCRIPTION("Host AP common routines");
MODULE_LICENSE("GPL");

#ifndef HOSTAP_CRYPT_MODULE
/* Old hostap_crypt module is now part of hostap module. */
#include "hostap_crypt.c"
#else /* HOSTAP_CRYPT_MODULE */
#define hostap_crypto_init()
#define hostap_crypto_deinit()
#endif /* HOSTAP_CRYPT_MODULE */

#define TX_TIMEOUT (2 * HZ)

#define PRISM2_MAX_FRAME_SIZE 2304
#define PRISM2_MIN_MTU 256
/* FIX: */
#define PRISM2_MAX_MTU (PRISM2_MAX_FRAME_SIZE - (6 /* LLC */ + 8 /* WEP */))


/* hostap.c */
static int prism2_wds_add(local_info_t *local, u8 *remote_addr,
                          int rtnl_locked);
static int prism2_wds_del(local_info_t *local, u8 *remote_addr,
                          int rtnl_locked, int do_not_remove);

/* hostap_ap.c */
#ifdef WIRELESS_EXT
static int prism2_ap_get_sta_qual(local_info_t *local, struct sockaddr addr[],
                                  struct iw_quality qual[], int buf_size,
                                  int aplist);
#if WIRELESS_EXT > 13
static int prism2_ap_translate_scan(struct net_device *dev, char *buffer);
#endif /* WIRELESS_EXT > 13 */
#endif /* WIRELESS_EXT */
static int prism2_hostapd(struct ap_data *ap,
                          struct prism2_hostapd_param *param);
static void * ap_crypt_get_ptrs(struct ap_data *ap, u8 *addr, int permanent,
                                struct prism2_crypt_data ***crypt);
static void ap_control_kickall(struct ap_data *ap);
#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
static int ap_control_add_mac(struct mac_restrictions *mac_restrictions,
                              u8 *mac);
static int ap_control_del_mac(struct mac_restrictions *mac_restrictions,
                              u8 *mac);
static void ap_control_flush_macs(struct mac_restrictions *mac_restrictions);
static int ap_control_kick_mac(struct ap_data *ap, struct net_device *dev,
                               u8 *mac);
#endif /* !PRISM2_NO_KERNEL_IEEE80211_MGMT */


#ifdef WIRELESS_EXT
static const long freq_list[] = { 2412, 2417, 2422, 2427, 2432, 2437, 2442,
                                  2447, 2452, 2457, 2462, 2467, 2472, 2484 };
#define FREQ_COUNT (sizeof(freq_list) / sizeof(freq_list[0]))
#endif /* WIRELESS_EXT */


/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static unsigned char rfc1042_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static unsigned char bridge_tunnel_header[] =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
/* No encapsulation header if EtherType < 0x600 (=length) */


/* FIX: these could be compiled separately and linked together to hostap.o */
#include "hostap_ap.c"
#include "hostap_info.c"
#include "hostap_ioctl.c"
#include "hostap_proc.c"
#include "hostap_80211_rx.c"


struct net_device * hostap_add_interface(struct local_info *local,
                                         int type, int rtnl_locked,
                                         const char *name)
{
        struct net_device *dev, *mdev;
        struct hostap_interface *iface;
        int ret;

        dev = alloc_etherdev(sizeof(struct hostap_interface));
        if (dev == NULL)
                return NULL;

        iface = dev->priv;
        iface->dev = dev;
        iface->local = local;
        iface->type = type;
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
        dev->name = iface->name;
#endif
        list_add(&iface->list, &local->hostap_interfaces);

        mdev = local->dev;
        memcpy(dev->dev_addr, mdev->dev_addr, ETH_ALEN);
        dev->base_addr = mdev->base_addr;
        dev->irq = mdev->irq;
        dev->mem_start = mdev->mem_start;
        dev->mem_end = mdev->mem_end;

        hostap_setup_dev(dev, local, 0);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
        dev->destructor = free_netdev;
#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0))
        /* Linux 2.4.x uses dev entry (reads dev->features) after
         * dev->destructor has returned, so must not free struct net_device
         * here. Set NETIF_F_DYNALLOC flag so that netdev_finish_unregister()
         * frees the entry. */
        dev->features |= NETIF_F_DYNALLOC;
#endif

        sprintf(dev->name, "%s%s", mdev->name, name);
        if (!rtnl_locked)
                rtnl_lock();

        ret = 0;
        if (strchr(dev->name, '%'))
                ret = dev_alloc_name(dev, dev->name);

        if (ret >= 0)
                ret = register_netdevice(dev);

        if (!rtnl_locked)
                rtnl_unlock();

        if (ret < 0) {
                printk(KERN_WARNING "%s: failed to add new netdevice!\n",
                       dev->name);
                free_netdev(dev);
                return NULL;
        }

        printk(KERN_DEBUG "%s: registered netdevice %s\n",
               mdev->name, dev->name);

        return dev;
}


void hostap_remove_interface(struct net_device *dev, int rtnl_locked,
                             int remove_from_list)
{
        if (!dev)
                return;

        if (remove_from_list) {
                struct hostap_interface *iface;
                iface = dev->priv;
                list_del(&iface->list);
        }
        if (rtnl_locked)
                unregister_netdevice(dev);
        else
                unregister_netdev(dev);

        /* dev->destructor = free_netdev() will free the device data, including
         * private data, when removing the device */
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0))
        /* Except for the compatibility case, which did not use
         * dev->destructor.. */
        free_netdev(dev);
#endif
}


static inline int prism2_wds_special_addr(u8 *addr)
{
        if (addr[0] || addr[1] || addr[2] || addr[3] || addr[4] || addr[5])
                return 0;

        return 1;
}


static int prism2_wds_add(local_info_t *local, u8 *remote_addr,
                          int rtnl_locked)
{
        struct net_device *dev;
        struct list_head *ptr;
        struct hostap_interface *iface, *empty, *match;
        unsigned long flags;

        empty = match = NULL;
        read_lock_irqsave(&local->iface_lock, flags);
        list_for_each(ptr, &local->hostap_interfaces) {
                iface = list_entry(ptr, struct hostap_interface, list);
                if (iface->type != HOSTAP_INTERFACE_WDS)
                        continue;

                if (prism2_wds_special_addr(iface->u.wds.remote_addr))
                        empty = iface;
                else if (memcmp(iface->u.wds.remote_addr, remote_addr,
                                ETH_ALEN) == 0) {
                        match = iface;
                        break;
                }
        }
        if (!match && empty) {
                /* take pre-allocated entry into use */
                memcpy(empty->u.wds.remote_addr, remote_addr, ETH_ALEN);
        }

        if (!match && empty) {
                read_unlock_irqrestore(&local->iface_lock, flags);
                printk(KERN_DEBUG "%s: using pre-allocated WDS netdevice %s\n",
                       local->dev->name, empty->dev->name);
                return 0;
        }
        read_unlock_irqrestore(&local->iface_lock, flags);

        if (!prism2_wds_special_addr(remote_addr)) {
                if (match)
                        return -EEXIST;
                hostap_add_sta(local->ap, remote_addr);
        }

        if (local->wds_connections >= local->wds_max_connections)
                return -ENOBUFS;

        /* verify that there is room for wds# postfix in the interface name */
        if (strlen(local->dev->name) > IFNAMSIZ - 5) {
                printk(KERN_DEBUG "'%s' too long base device name\n",
                       local->dev->name);
                return -EINVAL;
        }

        dev = hostap_add_interface(local, HOSTAP_INTERFACE_WDS, rtnl_locked,
                                   "wds%d");
        if (dev == NULL)
                return -ENOMEM;

        iface = dev->priv;
        memcpy(iface->u.wds.remote_addr, remote_addr, ETH_ALEN);

        local->wds_connections++;

        return 0;
}


static int prism2_wds_del(local_info_t *local, u8 *remote_addr,
                          int rtnl_locked, int do_not_remove)
{
        unsigned long flags;
        struct list_head *ptr;
        struct hostap_interface *iface, *selected = NULL;

        write_lock_irqsave(&local->iface_lock, flags);
        list_for_each(ptr, &local->hostap_interfaces) {
                iface = list_entry(ptr, struct hostap_interface, list);
                if (iface->type != HOSTAP_INTERFACE_WDS)
                        continue;

                if (memcmp(iface->u.wds.remote_addr, remote_addr,
                           ETH_ALEN) == 0) {
                        selected = iface;
                        break;
                }
        }
        if (selected && !do_not_remove)
                list_del(&selected->list);
        write_unlock_irqrestore(&local->iface_lock, flags);

        if (selected) {
                if (do_not_remove)
                        memset(selected->u.wds.remote_addr, 0, ETH_ALEN);
                else {
                        hostap_remove_interface(selected->dev, rtnl_locked, 0);
                        local->wds_connections--;
                }
        }

        return selected ? 0 : -ENODEV;
}


u16 hostap_tx_callback_register(local_info_t *local,
                                void (*func)(struct sk_buff *, int ok, void *),
                                void *data)
{
        unsigned long flags;
        struct hostap_tx_callback_info *entry;

        entry = (struct hostap_tx_callback_info *) kmalloc(sizeof(*entry),
                                                           GFP_ATOMIC);
        if (entry == NULL)
                return 0;

        entry->func = func;
        entry->data = data;

        spin_lock_irqsave(&local->lock, flags);
        entry->idx = local->tx_callback ? local->tx_callback->idx + 1 : 1;
        entry->next = local->tx_callback;
        local->tx_callback = entry;
        spin_unlock_irqrestore(&local->lock, flags);

        return entry->idx;
}


int hostap_tx_callback_unregister(local_info_t *local, u16 idx)
{
        unsigned long flags;
        struct hostap_tx_callback_info *cb, *prev = NULL;

        spin_lock_irqsave(&local->lock, flags);
        cb = local->tx_callback;
        while (cb != NULL && cb->idx != idx) {
                prev = cb;
                cb = cb->next;
        }
        if (cb) {
                if (prev == NULL)
                        local->tx_callback = cb->next;
                else
                        prev->next = cb->next;
                kfree(cb);
        }
        spin_unlock_irqrestore(&local->lock, flags);

        return cb ? 0 : -1;
}


/* val is in host byte order */
int hostap_set_word(struct net_device *dev, int rid, u16 val)
{
        struct hostap_interface *iface = dev->priv;
        u16 tmp = cpu_to_le16(val);
        return iface->local->func->set_rid(dev, rid, &tmp, 2);
}


int hostap_set_string(struct net_device *dev, int rid, const char *val)
{
        struct hostap_interface *iface = dev->priv;
        char buf[MAX_SSID_LEN + 2];
        int len;

        len = strlen(val);
        if (len > MAX_SSID_LEN)
                return -1;
        memset(buf, 0, sizeof(buf));
        buf[0] = len; /* little endian 16 bit word */
        memcpy(buf + 2, val, len);

        return iface->local->func->set_rid(dev, rid, &buf, MAX_SSID_LEN + 2);
}


u16 hostap_get_porttype(local_info_t *local)
{
        if (local->iw_mode == IW_MODE_ADHOC && local->pseudo_adhoc)
                return HFA384X_PORTTYPE_PSEUDO_IBSS;
        if (local->iw_mode == IW_MODE_ADHOC)
                return HFA384X_PORTTYPE_IBSS;
        if (local->iw_mode == IW_MODE_INFRA)
                return HFA384X_PORTTYPE_BSS;
        if (local->iw_mode == IW_MODE_REPEAT)
                return HFA384X_PORTTYPE_WDS;
        if (local->iw_mode == IW_MODE_MONITOR)
                return HFA384X_PORTTYPE_PSEUDO_IBSS;
        return HFA384X_PORTTYPE_HOSTAP;
}


int hostap_set_encryption(local_info_t *local)
{
        u16 val;
        int i, keylen, len, idx;
        char keybuf[WEP_KEY_LEN + 1];
        enum { NONE, WEP, OTHER } encrypt_type;

        if (local->crypt == NULL || local->crypt->ops == NULL)
                encrypt_type = NONE;
        else if (strcmp(local->crypt->ops->name, "WEP") == 0)
                encrypt_type = WEP;
        else
                encrypt_type = OTHER;

        if (local->func->get_rid(local->dev, HFA384X_RID_CNFWEPFLAGS, &val, 2,
                                 1) < 0) {
                printk(KERN_DEBUG "Could not read current WEP flags.\n");
                goto fail;
        }
        le16_to_cpus(&val);

        if (encrypt_type != NONE)
                val |= HFA384X_WEPFLAGS_PRIVACYINVOKED;
        else
                val &= ~HFA384X_WEPFLAGS_PRIVACYINVOKED;

        if (local->open_wep || encrypt_type == NONE ||
            (local->ieee_802_1x && local->host_decrypt))
                val &= ~HFA384X_WEPFLAGS_EXCLUDEUNENCRYPTED;
        else
                val |= HFA384X_WEPFLAGS_EXCLUDEUNENCRYPTED;

        if (encrypt_type != NONE &&
            (encrypt_type == OTHER || local->host_encrypt))
                val |= HFA384X_WEPFLAGS_HOSTENCRYPT;
        else
                val &= ~HFA384X_WEPFLAGS_HOSTENCRYPT;
        if (encrypt_type != NONE &&
            (encrypt_type == OTHER || local->host_decrypt))
                val |= HFA384X_WEPFLAGS_HOSTDECRYPT;
        else
                val &= ~HFA384X_WEPFLAGS_HOSTDECRYPT;

        if (hostap_set_word(local->dev, HFA384X_RID_CNFWEPFLAGS, val)) {
                printk(KERN_DEBUG "Could not write new WEP flags (0x%x)\n",
                       val);
                goto fail;
        }

        if (encrypt_type != WEP)
                return 0;

        /* 104-bit support seems to require that all the keys are set to the
         * same keylen */
        keylen = 6; /* first 5 octets */
        idx = local->crypt->ops->get_key_idx(local->crypt->priv);
        len = local->crypt->ops->get_key(idx, keybuf, sizeof(keybuf),
                                         local->crypt->priv);
        if (idx >= 0 && idx < WEP_KEYS && len > 5)
                keylen = WEP_KEY_LEN + 1; /* first 13 octets */

        for (i = 0; i < WEP_KEYS; i++) {
                memset(keybuf, 0, sizeof(keybuf));
                (void) local->crypt->ops->get_key(i, keybuf, sizeof(keybuf),
                                                  local->crypt->priv);
                if (local->func->set_rid(local->dev,
                                         HFA384X_RID_CNFDEFAULTKEY0 + i,
                                         keybuf, keylen)) {
                        printk(KERN_DEBUG "Could not set key %d (len=%d)\n",
                               i, keylen);
                        goto fail;
                }
        }
        if (hostap_set_word(local->dev, HFA384X_RID_CNFWEPDEFAULTKEYID, idx)) {
                printk(KERN_DEBUG "Could not set default keyid %d\n", idx);
                goto fail;
        }

        return 0;

 fail:
        printk(KERN_DEBUG "%s: encryption setup failed\n", local->dev->name);
        return -1;
}


int hostap_set_antsel(local_info_t *local)
{
        u16 val;
        int ret = 0;

        if (local->antsel_tx != HOSTAP_ANTSEL_DO_NOT_TOUCH &&
            local->func->cmd(local->dev, HFA384X_CMDCODE_READMIF,
                             HFA386X_CR_TX_CONFIGURE,
                             NULL, &val) == 0) {
                val &= ~(BIT(2) | BIT(1));
                switch (local->antsel_tx) {
                case HOSTAP_ANTSEL_DIVERSITY:
                        val |= BIT(1);
                        break;
                case HOSTAP_ANTSEL_LOW:
                        break;
                case HOSTAP_ANTSEL_HIGH:
                        val |= BIT(2);
                        break;
                }

                if (local->func->cmd(local->dev, HFA384X_CMDCODE_WRITEMIF,
                                     HFA386X_CR_TX_CONFIGURE, &val, NULL)) {
                        printk(KERN_INFO "%s: setting TX AntSel failed\n",
                               local->dev->name);
                        ret = -1;
                }
        }

        if (local->antsel_rx != HOSTAP_ANTSEL_DO_NOT_TOUCH &&
            local->func->cmd(local->dev, HFA384X_CMDCODE_READMIF,
                             HFA386X_CR_RX_CONFIGURE,
                             NULL, &val) == 0) {
                val &= ~(BIT(1) | BIT(0));
                switch (local->antsel_rx) {
                case HOSTAP_ANTSEL_DIVERSITY:
                        break;
                case HOSTAP_ANTSEL_LOW:
                        val |= BIT(0);
                        break;
                case HOSTAP_ANTSEL_HIGH:
                        val |= BIT(0) | BIT(1);
                        break;
                }

                if (local->func->cmd(local->dev, HFA384X_CMDCODE_WRITEMIF,
                                     HFA386X_CR_RX_CONFIGURE, &val, NULL)) {
                        printk(KERN_INFO "%s: setting RX AntSel failed\n",
                               local->dev->name);
                        ret = -1;
                }
        }

        return ret;
}


int hostap_set_roaming(local_info_t *local)
{
        u16 val;

        switch (local->host_roaming) {
        case 1:
                val = HFA384X_ROAMING_HOST;
                break;
        case 2:
                val = HFA384X_ROAMING_DISABLED;
                break;
        case 0:
        default:
                val = HFA384X_ROAMING_FIRMWARE;
                break;
        }

        return hostap_set_word(local->dev, HFA384X_RID_CNFROAMINGMODE, val);
}


int hostap_set_auth_algs(local_info_t *local)
{
        int val = local->auth_algs;
        /* At least STA f/w v0.6.2 seems to have issues with cnfAuthentication
         * set to include both Open and Shared Key flags. It tries to use
         * Shared Key authentication in that case even if WEP keys are not
         * configured.. STA f/w v0.7.6 is able to handle such configuration,
         * but it is unknown when this was fixed between 0.6.2 .. 0.7.6. */
        if (local->sta_fw_ver < PRISM2_FW_VER(0,7,0) &&
            val != PRISM2_AUTH_OPEN && val != PRISM2_AUTH_SHARED_KEY)
                val = PRISM2_AUTH_OPEN;

        if (hostap_set_word(local->dev, HFA384X_RID_CNFAUTHENTICATION, val)) {
                printk(KERN_INFO "%s: cnfAuthentication setting to 0x%x "
                       "failed\n", local->dev->name, local->auth_algs);
                return -EINVAL;
        }

        return 0;
}


void hostap_dump_rx_header(const char *name, const struct hfa384x_rx_frame *rx)
{
        u16 status, fc;

        status = __le16_to_cpu(rx->status);

        printk(KERN_DEBUG "%s: RX status=0x%04x (port=%d, type=%d, "
               "fcserr=%d) silence=%d signal=%d rate=%d rxflow=%d; "
               "jiffies=%ld\n",
               name, status, (status >> 8) & 0x07, status >> 13, status & 1,
               rx->silence, rx->signal, rx->rate, rx->rxflow, jiffies);

        fc = __le16_to_cpu(rx->frame_control);
        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d) dur=0x%04x seq=0x%04x "
               "data_len=%d%s%s\n",
               fc, WLAN_FC_GET_TYPE(fc), WLAN_FC_GET_STYPE(fc),
               __le16_to_cpu(rx->duration_id), __le16_to_cpu(rx->seq_ctrl),
               __le16_to_cpu(rx->data_len),
               fc & WLAN_FC_TODS ? " [ToDS]" : "",
               fc & WLAN_FC_FROMDS ? " [FromDS]" : "");

        printk(KERN_DEBUG "   A1=" MACSTR " A2=" MACSTR " A3=" MACSTR " A4="
               MACSTR "\n",
               MAC2STR(rx->addr1), MAC2STR(rx->addr2), MAC2STR(rx->addr3),
               MAC2STR(rx->addr4));

        printk(KERN_DEBUG "   dst=" MACSTR " src=" MACSTR " len=%d\n",
               MAC2STR(rx->dst_addr), MAC2STR(rx->src_addr),
               __be16_to_cpu(rx->len));
}


void hostap_dump_tx_header(const char *name, const struct hfa384x_tx_frame *tx)
{
        u16 fc;

        printk(KERN_DEBUG "%s: TX status=0x%04x retry_count=%d tx_rate=%d "
               "tx_control=0x%04x; jiffies=%ld\n",
               name, __le16_to_cpu(tx->status), tx->retry_count, tx->tx_rate,
               __le16_to_cpu(tx->tx_control), jiffies);

        fc = __le16_to_cpu(tx->frame_control);
        printk(KERN_DEBUG "   FC=0x%04x (type=%d:%d) dur=0x%04x seq=0x%04x "
               "data_len=%d%s%s\n",
               fc, WLAN_FC_GET_TYPE(fc), WLAN_FC_GET_STYPE(fc),
               __le16_to_cpu(tx->duration_id), __le16_to_cpu(tx->seq_ctrl),
               __le16_to_cpu(tx->data_len),
               fc & WLAN_FC_TODS ? " [ToDS]" : "",
               fc & WLAN_FC_FROMDS ? " [FromDS]" : "");

        printk(KERN_DEBUG "   A1=" MACSTR " A2=" MACSTR " A3=" MACSTR " A4="
               MACSTR "\n",
               MAC2STR(tx->addr1), MAC2STR(tx->addr2), MAC2STR(tx->addr3),
               MAC2STR(tx->addr4));

        printk(KERN_DEBUG "   dst=" MACSTR " src=" MACSTR " len=%d\n",
               MAC2STR(tx->dst_addr), MAC2STR(tx->src_addr),
               __be16_to_cpu(tx->len));
}


/* TODO: share one netif queue for all interfaces and get rid of these
 * functions.. */
/* wake all netif queues in use */
void hostap_netif_wake_queues(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;
        struct list_head *ptr;
        unsigned long flags;

        read_lock_irqsave(&local->iface_lock, flags);
        list_for_each(ptr, &local->hostap_interfaces) {
                iface = list_entry(ptr, struct hostap_interface, list);
                netif_wake_queue(iface->dev);
        }
        read_unlock_irqrestore(&local->iface_lock, flags);
}


/* stop all netif queues in use */
void hostap_netif_stop_queues(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;
        struct list_head *ptr;
        unsigned long flags;

        read_lock_irqsave(&local->iface_lock, flags);
        list_for_each(ptr, &local->hostap_interfaces) {
                iface = list_entry(ptr, struct hostap_interface, list);
                netif_stop_queue(iface->dev);
        }
        read_unlock_irqrestore(&local->iface_lock, flags);
}


int hostap_80211_header_parse(struct sk_buff *skb, unsigned char *haddr)
{
        memcpy(haddr, skb->mac.raw + 10, ETH_ALEN); /* addr2 */
        return ETH_ALEN;
}


int hostap_80211_prism_header_parse(struct sk_buff *skb, unsigned char *haddr)
{
        if (*(u32 *)skb->mac.raw == LWNG_CAP_DID_BASE) {
                memcpy(haddr, skb->mac.raw +
                       sizeof(struct linux_wlan_ng_prism_hdr) + 10,
                       ETH_ALEN); /* addr2 */
        } else { /* (*(u32 *)skb->mac.raw == htonl(LWNG_CAPHDR_VERSION)) */
                memcpy(haddr, skb->mac.raw +
                       sizeof(struct linux_wlan_ng_cap_hdr) + 10,
                       ETH_ALEN); /* addr2 */
        }
        return ETH_ALEN;
}


int hostap_80211_get_hdrlen(u16 fc)
{
        int hdrlen = 24;

        switch (WLAN_FC_GET_TYPE(fc)) {
        case WLAN_FC_TYPE_DATA:
                if ((fc & WLAN_FC_FROMDS) && (fc & WLAN_FC_TODS))
                        hdrlen = 30; /* Addr4 */
                break;
        case WLAN_FC_TYPE_CTRL:
                switch (WLAN_FC_GET_STYPE(fc)) {
                case WLAN_FC_STYPE_CTS:
                case WLAN_FC_STYPE_ACK:
                        hdrlen = 10;
                        break;
                default:
                        hdrlen = 16;
                        break;
                }
                break;
        }

        return hdrlen;
}


struct net_device_stats *hostap_get_stats(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        return &iface->stats;
}


static int prism2_close(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;

        PDEBUG(DEBUG_FLOW, "%s: prism2_close\n", dev->name);

#ifndef PRISM2_NO_KERNEL_IEEE80211_MGMT
        if (!local->hostapd && dev == local->dev &&
            (!local->func->card_present || local->func->card_present(local)) &&
            local->hw_ready && local->ap && local->iw_mode == IW_MODE_MASTER)
                hostap_deauth_all_stas(dev, local->ap, 1);
#endif /* PRISM2_NO_KERNEL_IEEE80211_MGMT */

        if (local->func->dev_close && local->func->dev_close(local))
                return 0;

        if (local->disable_on_close) {
                local->func->hw_shutdown(dev, HOSTAP_HW_ENABLE_CMDCOMPL);
        }

        if (netif_running(dev)) {
                netif_stop_queue(dev);
                netif_device_detach(dev);
        }

        flush_scheduled_work();

#ifdef NEW_MODULE_CODE
        module_put(local->hw_module);
#elif MODULE
        __MOD_DEC_USE_COUNT(local->hw_module);
#endif

        return 0;
}


static int prism2_open(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;

        PDEBUG(DEBUG_FLOW, "%s: prism2_open\n", dev->name);

        if (local->func->dev_open && local->func->dev_open(local))
                return 1;

#ifdef NEW_MODULE_CODE
        if (!try_module_get(local->hw_module))
                return -ENODEV;
#elif MODULE
        __MOD_INC_USE_COUNT(local->hw_module);
#endif

        if (!local->dev_enabled && local->func->hw_enable(dev, 1)) {
                printk(KERN_WARNING "%s: could not enable MAC port\n",
                       dev->name);
                prism2_close(dev);
                return 1;
        }
        if (!local->dev_enabled)
                prism2_callback(local, PRISM2_CALLBACK_ENABLE);
        local->dev_enabled = 1;

        netif_device_attach(dev);
        netif_start_queue(dev);

        return 0;
}


#ifdef HAVE_SET_MAC_ADDR
static int prism2_set_mac_address(struct net_device *dev, void *p)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;
        struct list_head *ptr;
        struct sockaddr *addr = p;
        unsigned long flags;

        if (local->func->set_rid(dev, HFA384X_RID_CNFOWNMACADDR, addr->sa_data,
                                 ETH_ALEN) < 0 || local->func->reset_port(dev))
                return -EINVAL;

        read_lock_irqsave(&local->iface_lock, flags);
        list_for_each(ptr, &local->hostap_interfaces) {
                iface = list_entry(ptr, struct hostap_interface, list);
                memcpy(iface->dev->dev_addr, addr->sa_data, ETH_ALEN);
        }
        read_unlock_irqrestore(&local->iface_lock, flags);

        return 0;
}
#endif /* HAVE_SET_MAC_ADDR */


/* TODO: to be further implemented as soon as Prism2 fully supports
 *       GroupAddresses and correct documentation is available */
void hostap_set_multicast_list_queue(void *data)
{
        struct net_device *dev = (struct net_device *) data;
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;

        if (hostap_set_word(dev, HFA384X_RID_PROMISCUOUSMODE,
                            local->is_promisc)) {
                printk(KERN_INFO "%s: %sabling promiscuous mode failed\n",
                       dev->name, local->is_promisc ? "en" : "dis");
        }

#ifndef NEW_MODULE_CODE
        MOD_DEC_USE_COUNT;
#endif
}


static void hostap_set_multicast_list(struct net_device *dev)
{
#if 0
        /* FIX: promiscuous mode seems to be causing a lot of problems with
         * some station firmware versions (FCSErr frames, invalid MACPort, etc.
         * corrupted incoming frames). This code is now commented out while the
         * problems are investigated. */
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;

        if ((dev->flags & IFF_ALLMULTI) || (dev->flags & IFF_PROMISC)) {
                local->is_promisc = 1;
        } else {
                local->is_promisc = 0;
        }

        PRISM2_SCHEDULE_TASK(&local->set_multicast_list_queue);
#endif
}


static int prism2_change_mtu(struct net_device *dev, int new_mtu)
{
        if (new_mtu < PRISM2_MIN_MTU || new_mtu > PRISM2_MAX_MTU)
                return -EINVAL;

        dev->mtu = new_mtu;
        return 0;
}


#ifdef HAVE_TX_TIMEOUT
static void prism2_tx_timeout(struct net_device *dev)
{
        struct hostap_interface *iface = dev->priv;
        local_info_t *local = iface->local;
        struct hfa384x_regs regs;

        printk(KERN_WARNING "%s Tx timed out! Resetting card\n", dev->name);
        hostap_netif_stop_queues(dev);

        local->func->read_regs(dev, &regs);
        printk(KERN_DEBUG "%s: CMD=%04x EVSTAT=%04x "
               "OFFSET0=%04x OFFSET1=%04x SWSUPPORT0=%04x\n",
               dev->name, regs.cmd, regs.evstat, regs.offset0, regs.offset1,
               regs.swsupport0);

        local->func->schedule_reset(local);
}
#endif /* HAVE_TX_TIMEOUT */


void hostap_setup_dev(struct net_device *dev, local_info_t *local,
                      int main_dev)
{
        ether_setup(dev);

        /* kernel callbacks */
        dev->get_stats = hostap_get_stats;
#ifdef WIRELESS_EXT
        dev->get_wireless_stats = main_dev ? hostap_get_wireless_stats : NULL;
#if WIRELESS_EXT > 12
        dev->wireless_handlers =
                (struct iw_handler_def *) &hostap_iw_handler_def;
#endif /* WIRELESS_EXT > 12 */
#ifdef HAVE_PRIVATE_IOCTL
        dev->do_ioctl = main_dev ? hostap_ioctl : NULL;
#endif
#endif /* WIRELESS_EXT */
        dev->open = prism2_open;
        dev->stop = prism2_close;
        if (local->func)
                dev->hard_start_xmit = local->func->tx;
        else
                printk(KERN_WARNING "hostap_setup_dev: local->func == NULL\n");
#ifdef HAVE_SET_MAC_ADDR
        dev->set_mac_address = prism2_set_mac_address;
#endif /* HAVE_SET_MAC_ADDR */
#ifdef HAVE_MULTICAST
        dev->set_multicast_list = hostap_set_multicast_list;
#endif
#ifdef HAVE_CHANGE_MTU
        dev->change_mtu = prism2_change_mtu;
#endif
#ifdef HAVE_TX_TIMEOUT
        dev->tx_timeout = prism2_tx_timeout;
        dev->watchdog_timeo = TX_TIMEOUT;
#endif

        dev->mtu = local->mtu;

        netif_stop_queue(dev);
}


static int hostap_enable_hostapd(local_info_t *local, int rtnl_locked)
{
        struct net_device *dev = local->dev;

        if (local->apdev)
                return -EEXIST;

        printk(KERN_DEBUG "%s: enabling hostapd mode\n", dev->name);

        local->apdev = hostap_add_interface(local, HOSTAP_INTERFACE_AP,
                                            rtnl_locked, "ap");
        if (local->apdev == NULL)
                return -ENOMEM;

        local->apdev->hard_start_xmit = local->func->tx_80211;
        local->apdev->type = ARPHRD_IEEE80211_PRISM;
        local->apdev->hard_header_parse = hostap_80211_header_parse;

        local->stadev = hostap_add_interface(local, HOSTAP_INTERFACE_STA,
                                             rtnl_locked, "sta");
        if (local->stadev == NULL)
                return -ENOMEM;

        return 0;
}


static int hostap_disable_hostapd(local_info_t *local, int rtnl_locked)
{
        struct net_device *dev = local->dev;

        printk(KERN_DEBUG "%s: disabling hostapd mode\n", dev->name);

        hostap_remove_interface(local->apdev, rtnl_locked, 1);
        local->apdev = NULL;

        hostap_remove_interface(local->stadev, rtnl_locked, 1);
        local->stadev = NULL;

        return 0;
}


int hostap_set_hostapd(local_info_t *local, int val, int rtnl_locked)
{
        if (val < 0 || val > 1)
                return -EINVAL;

        if (local->hostapd == val)
                return 0;

        local->hostapd = val;

        if (val)
                return hostap_enable_hostapd(local, rtnl_locked);
        else
                return hostap_disable_hostapd(local, rtnl_locked);
}


struct proc_dir_entry *hostap_proc;

static int __init hostap_init(void)
{
        hostap_crypto_init();

        if (proc_net != NULL) {
                hostap_proc = proc_mkdir("hostap", proc_net);
                if (!hostap_proc)
                        printk(KERN_WARNING "Failed to mkdir "
                               "/proc/net/hostap\n");
        } else
                hostap_proc = NULL;

        return 0;
}


static void __exit hostap_exit(void)
{
        if (hostap_proc != NULL) {
                hostap_proc = NULL;
                remove_proc_entry("hostap", proc_net);
        }

        hostap_crypto_deinit();
}


EXPORT_SYMBOL(hostap_set_word);
EXPORT_SYMBOL(hostap_set_string);
EXPORT_SYMBOL(hostap_get_porttype);
EXPORT_SYMBOL(hostap_set_encryption);
EXPORT_SYMBOL(hostap_set_antsel);
EXPORT_SYMBOL(hostap_set_roaming);
EXPORT_SYMBOL(hostap_set_auth_algs);
EXPORT_SYMBOL(hostap_dump_rx_header);
EXPORT_SYMBOL(hostap_dump_tx_header);
EXPORT_SYMBOL(hostap_netif_wake_queues);
EXPORT_SYMBOL(hostap_netif_stop_queues);
EXPORT_SYMBOL(hostap_80211_header_parse);
EXPORT_SYMBOL(hostap_80211_prism_header_parse);
EXPORT_SYMBOL(hostap_80211_get_hdrlen);
EXPORT_SYMBOL(hostap_get_stats);
EXPORT_SYMBOL(hostap_setup_dev);
EXPORT_SYMBOL(hostap_proc);
EXPORT_SYMBOL(hostap_set_multicast_list_queue);
EXPORT_SYMBOL(hostap_set_hostapd);
EXPORT_SYMBOL(hostap_add_interface);
EXPORT_SYMBOL(hostap_remove_interface);

module_init(hostap_init);
module_exit(hostap_exit);

---