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hostap_main.c

/*
 * 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
 * <j@w1.fi>
 * Copyright (c) 2002-2005, Jouni Malinen <j@w1.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.
 */

#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>
#include <linux/workqueue.h>
#include <linux/kmod.h>
#include <linux/rtnetlink.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <net/net_namespace.h>
#include <net/iw_handler.h>
#include <net/ieee80211.h>
#include <net/ieee80211_crypt.h>
#include <asm/uaccess.h>

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

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

#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 */))


struct net_device * hostap_add_interface(struct local_info *local,
                               int type, int rtnl_locked,
                               const char *prefix,
                               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 = netdev_priv(dev);
      iface->dev = dev;
      iface->local = local;
      iface->type = type;
      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, type);
      dev->destructor = free_netdev;

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

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

      SET_NETDEV_DEV(dev, mdev->dev.parent);
      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)
{
      struct hostap_interface *iface;

      if (!dev)
            return;

      iface = netdev_priv(dev);

      if (remove_from_list) {
            list_del(&iface->list);
      }

      if (dev == iface->local->ddev)
            iface->local->ddev = NULL;
      else if (dev == iface->local->apdev)
            iface->local->apdev = NULL;
      else if (dev == iface->local->stadev)
            iface->local->stadev = NULL;

      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 */
}


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;
}


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;

      empty = match = NULL;
      read_lock_bh(&local->iface_lock);
      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 && !prism2_wds_special_addr(remote_addr)) {
            /* take pre-allocated entry into use */
            memcpy(empty->u.wds.remote_addr, remote_addr, ETH_ALEN);
            read_unlock_bh(&local->iface_lock);
            printk(KERN_DEBUG "%s: using pre-allocated WDS netdevice %s\n",
                   local->dev->name, empty->dev->name);
            return 0;
      }
      read_unlock_bh(&local->iface_lock);

      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,
                           local->ddev->name, "wds%d");
      if (dev == NULL)
            return -ENOMEM;

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

      local->wds_connections++;

      return 0;
}


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 = 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;
      u16 tmp = cpu_to_le16(val);
      iface = netdev_priv(dev);
      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;
      char buf[MAX_SSID_LEN + 2];
      int len;

      iface = netdev_priv(dev);
      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, old_val;
      int i, keylen, len, idx;
      char keybuf[WEP_KEY_LEN + 1];
      enum { NONE, WEP, OTHER } encrypt_type;

      idx = local->tx_keyidx;
      if (local->crypt[idx] == NULL || local->crypt[idx]->ops == NULL)
            encrypt_type = NONE;
      else if (strcmp(local->crypt[idx]->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);
      old_val = val;

      if (encrypt_type != NONE || local->privacy_invoked)
            val |= HFA384X_WEPFLAGS_PRIVACYINVOKED;
      else
            val &= ~HFA384X_WEPFLAGS_PRIVACYINVOKED;

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

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

      if (val != old_val &&
          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 */
      len = local->crypt[idx]->ops->get_key(keybuf, sizeof(keybuf),
                                    NULL, local->crypt[idx]->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));
            if (local->crypt[i]) {
                  (void) local->crypt[i]->ops->get_key(
                        keybuf, sizeof(keybuf),
                        NULL, local->crypt[i]->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;
      DECLARE_MAC_BUF(mac);
      DECLARE_MAC_BUF(mac2);
      DECLARE_MAC_BUF(mac3);
      DECLARE_MAC_BUF(mac4);

      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) >> 2, WLAN_FC_GET_STYPE(fc) >> 4,
             __le16_to_cpu(rx->duration_id), __le16_to_cpu(rx->seq_ctrl),
             __le16_to_cpu(rx->data_len),
             fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
             fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");

      printk(KERN_DEBUG "   A1=%s A2=%s A3=%s A4=%s\n",
             print_mac(mac, rx->addr1), print_mac(mac2, rx->addr2),
             print_mac(mac3, rx->addr3), print_mac(mac4, rx->addr4));

      printk(KERN_DEBUG "   dst=%s src=%s len=%d\n",
             print_mac(mac, rx->dst_addr), print_mac(mac2, rx->src_addr),
             __be16_to_cpu(rx->len));
}


void hostap_dump_tx_header(const char *name, const struct hfa384x_tx_frame *tx)
{
      u16 fc;
      DECLARE_MAC_BUF(mac);
      DECLARE_MAC_BUF(mac2);
      DECLARE_MAC_BUF(mac3);
      DECLARE_MAC_BUF(mac4);

      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) >> 2, WLAN_FC_GET_STYPE(fc) >> 4,
             __le16_to_cpu(tx->duration_id), __le16_to_cpu(tx->seq_ctrl),
             __le16_to_cpu(tx->data_len),
             fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
             fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");

      printk(KERN_DEBUG "   A1=%s A2=%s A3=%s A4=%s\n",
             print_mac(mac, tx->addr1), print_mac(mac2, tx->addr2),
             print_mac(mac3, tx->addr3), print_mac(mac4, tx->addr4));

      printk(KERN_DEBUG "   dst=%s src=%s len=%d\n",
             print_mac(mac, tx->dst_addr), print_mac(mac2, tx->src_addr),
             __be16_to_cpu(tx->len));
}


int hostap_80211_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
      struct hostap_interface *iface = netdev_priv(skb->dev);
      local_info_t *local = iface->local;

      if (local->monitor_type == PRISM2_MONITOR_PRISM ||
          local->monitor_type == PRISM2_MONITOR_CAPHDR) {
            const unsigned char *mac = skb_mac_header(skb);

            if (*(u32 *)mac == LWNG_CAP_DID_BASE) {
                  memcpy(haddr,
                         mac + sizeof(struct linux_wlan_ng_prism_hdr) + 10,
                         ETH_ALEN); /* addr2 */
            } else { /* (*(u32 *)mac == htonl(LWNG_CAPHDR_VERSION)) */
                  memcpy(haddr,
                         mac + sizeof(struct linux_wlan_ng_cap_hdr) + 10,
                         ETH_ALEN); /* addr2 */
            }
      } else
            memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */

      return ETH_ALEN;
}


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

      switch (WLAN_FC_GET_TYPE(fc)) {
      case IEEE80211_FTYPE_DATA:
            if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))
                  hdrlen = 30; /* Addr4 */
            break;
      case IEEE80211_FTYPE_CTL:
            switch (WLAN_FC_GET_STYPE(fc)) {
            case IEEE80211_STYPE_CTS:
            case IEEE80211_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;
      iface = netdev_priv(dev);
      return &iface->stats;
}


static int prism2_close(struct net_device *dev)
{
      struct hostap_interface *iface;
      local_info_t *local;

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

      iface = netdev_priv(dev);
      local = iface->local;

      if (dev == local->ddev) {
            prism2_sta_deauth(local, WLAN_REASON_DEAUTH_LEAVING);
      }
#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 (dev == local->dev) {
            local->func->hw_shutdown(dev, HOSTAP_HW_ENABLE_CMDCOMPL);
      }

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

      flush_scheduled_work();

      module_put(local->hw_module);

      local->num_dev_open--;

      if (dev != local->dev && local->dev->flags & IFF_UP &&
          local->master_dev_auto_open && local->num_dev_open == 1) {
            /* Close master radio interface automatically if it was also
             * opened automatically and we are now closing the last
             * remaining non-master device. */
            dev_close(local->dev);
      }

      return 0;
}


static int prism2_open(struct net_device *dev)
{
      struct hostap_interface *iface;
      local_info_t *local;

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

      iface = netdev_priv(dev);
      local = iface->local;

      if (local->no_pri) {
            printk(KERN_DEBUG "%s: could not set interface UP - no PRI "
                   "f/w\n", dev->name);
            return 1;
      }

      if ((local->func->card_present && !local->func->card_present(local)) ||
          local->hw_downloading)
            return -ENODEV;

      if (!try_module_get(local->hw_module))
            return -ENODEV;
      local->num_dev_open++;

      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;

      if (dev != local->dev && !(local->dev->flags & IFF_UP)) {
            /* Master radio interface is needed for all operation, so open
             * it automatically when any virtual net_device is opened. */
            local->master_dev_auto_open = 1;
            dev_open(local->dev);
      }

      netif_device_attach(dev);
      netif_start_queue(dev);

      return 0;
}


static int prism2_set_mac_address(struct net_device *dev, void *p)
{
      struct hostap_interface *iface;
      local_info_t *local;
      struct list_head *ptr;
      struct sockaddr *addr = p;

      iface = netdev_priv(dev);
      local = iface->local;

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

      read_lock_bh(&local->iface_lock);
      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);
      }
      memcpy(local->dev->dev_addr, addr->sa_data, ETH_ALEN);
      read_unlock_bh(&local->iface_lock);

      return 0;
}


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

      iface = netdev_priv(dev);
      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");
      }
}


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;
      local_info_t *local;

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

      schedule_work(&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;
}


static void prism2_tx_timeout(struct net_device *dev)
{
      struct hostap_interface *iface;
      local_info_t *local;
      struct hfa384x_regs regs;

      iface = netdev_priv(dev);
      local = iface->local;

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

const struct header_ops hostap_80211_ops = {
      .create           = eth_header,
      .rebuild    = eth_rebuild_header,
      .cache            = eth_header_cache,
      .cache_update     = eth_header_cache_update,

      .parse            = hostap_80211_header_parse,
};
EXPORT_SYMBOL(hostap_80211_ops);

void hostap_setup_dev(struct net_device *dev, local_info_t *local,
                  int type)
{
      struct hostap_interface *iface;

      iface = netdev_priv(dev);
      ether_setup(dev);

      /* kernel callbacks */
      dev->get_stats = hostap_get_stats;
      if (iface) {
            /* Currently, we point to the proper spy_data only on
             * the main_dev. This could be fixed. Jean II */
            iface->wireless_data.spy_data = &iface->spy_data;
            dev->wireless_data = &iface->wireless_data;
      }
      dev->wireless_handlers =
            (struct iw_handler_def *) &hostap_iw_handler_def;
      dev->do_ioctl = hostap_ioctl;
      dev->open = prism2_open;
      dev->stop = prism2_close;
      dev->set_mac_address = prism2_set_mac_address;
      dev->set_multicast_list = hostap_set_multicast_list;
      dev->change_mtu = prism2_change_mtu;
      dev->tx_timeout = prism2_tx_timeout;
      dev->watchdog_timeo = TX_TIMEOUT;

      if (type == HOSTAP_INTERFACE_AP) {
            dev->hard_start_xmit = hostap_mgmt_start_xmit;
            dev->type = ARPHRD_IEEE80211;
            dev->header_ops = &hostap_80211_ops;
      } else {
            dev->hard_start_xmit = hostap_data_start_xmit;
      }

      dev->mtu = local->mtu;
      if (type != HOSTAP_INTERFACE_MASTER) {
            /* use main radio device queue */
            dev->tx_queue_len = 0;
      }

      SET_ETHTOOL_OPS(dev, &prism2_ethtool_ops);

      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, local->ddev->name,
                                  "ap");
      if (local->apdev == 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;

      return 0;
}


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

      if (local->stadev)
            return -EEXIST;

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

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

      return 0;
}


static int hostap_disable_hostapd_sta(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->stadev, rtnl_locked, 1);
      local->stadev = NULL;

      return 0;
}


int hostap_set_hostapd(local_info_t *local, int val, int rtnl_locked)
{
      int ret;

      if (val < 0 || val > 1)
            return -EINVAL;

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

      if (val) {
            ret = hostap_enable_hostapd(local, rtnl_locked);
            if (ret == 0)
                  local->hostapd = 1;
      } else {
            local->hostapd = 0;
            ret = hostap_disable_hostapd(local, rtnl_locked);
            if (ret != 0)
                  local->hostapd = 1;
      }

      return ret;
}


int hostap_set_hostapd_sta(local_info_t *local, int val, int rtnl_locked)
{
      int ret;

      if (val < 0 || val > 1)
            return -EINVAL;

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

      if (val) {
            ret = hostap_enable_hostapd_sta(local, rtnl_locked);
            if (ret == 0)
                  local->hostapd_sta = 1;
      } else {
            local->hostapd_sta = 0;
            ret = hostap_disable_hostapd_sta(local, rtnl_locked);
            if (ret != 0)
                  local->hostapd_sta = 1;
      }


      return ret;
}


int prism2_update_comms_qual(struct net_device *dev)
{
      struct hostap_interface *iface;
      local_info_t *local;
      int ret = 0;
      struct hfa384x_comms_quality sq;

      iface = netdev_priv(dev);
      local = iface->local;
      if (!local->sta_fw_ver)
            ret = -1;
      else if (local->sta_fw_ver >= PRISM2_FW_VER(1,3,1)) {
            if (local->func->get_rid(local->dev,
                               HFA384X_RID_DBMCOMMSQUALITY,
                               &sq, sizeof(sq), 1) >= 0) {
                  local->comms_qual = (s16) le16_to_cpu(sq.comm_qual);
                  local->avg_signal = (s16) le16_to_cpu(sq.signal_level);
                  local->avg_noise = (s16) le16_to_cpu(sq.noise_level);
                  local->last_comms_qual_update = jiffies;
            } else
                  ret = -1;
      } else {
            if (local->func->get_rid(local->dev, HFA384X_RID_COMMSQUALITY,
                               &sq, sizeof(sq), 1) >= 0) {
                  local->comms_qual = le16_to_cpu(sq.comm_qual);
                  local->avg_signal = HFA384X_LEVEL_TO_dBm(
                        le16_to_cpu(sq.signal_level));
                  local->avg_noise = HFA384X_LEVEL_TO_dBm(
                        le16_to_cpu(sq.noise_level));
                  local->last_comms_qual_update = jiffies;
            } else
                  ret = -1;
      }

      return ret;
}


int prism2_sta_send_mgmt(local_info_t *local, u8 *dst, u16 stype,
                   u8 *body, size_t bodylen)
{
      struct sk_buff *skb;
      struct hostap_ieee80211_mgmt *mgmt;
      struct hostap_skb_tx_data *meta;
      struct net_device *dev = local->dev;

      skb = dev_alloc_skb(IEEE80211_MGMT_HDR_LEN + bodylen);
      if (skb == NULL)
            return -ENOMEM;

      mgmt = (struct hostap_ieee80211_mgmt *)
            skb_put(skb, IEEE80211_MGMT_HDR_LEN);
      memset(mgmt, 0, IEEE80211_MGMT_HDR_LEN);
      mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
      memcpy(mgmt->da, dst, ETH_ALEN);
      memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
      memcpy(mgmt->bssid, dst, ETH_ALEN);
      if (body)
            memcpy(skb_put(skb, bodylen), body, bodylen);

      meta = (struct hostap_skb_tx_data *) skb->cb;
      memset(meta, 0, sizeof(*meta));
      meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
      meta->iface = netdev_priv(dev);

      skb->dev = dev;
      skb_reset_mac_header(skb);
      skb_reset_network_header(skb);
      dev_queue_xmit(skb);

      return 0;
}


int prism2_sta_deauth(local_info_t *local, u16 reason)
{
      union iwreq_data wrqu;
      int ret;

      if (local->iw_mode != IW_MODE_INFRA ||
          memcmp(local->bssid, "\x00\x00\x00\x00\x00\x00", ETH_ALEN) == 0 ||
          memcmp(local->bssid, "\x44\x44\x44\x44\x44\x44", ETH_ALEN) == 0)
            return 0;

      reason = cpu_to_le16(reason);
      ret = prism2_sta_send_mgmt(local, local->bssid, IEEE80211_STYPE_DEAUTH,
                           (u8 *) &reason, 2);
      memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
      wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
      return ret;
}


struct proc_dir_entry *hostap_proc;

static int __init hostap_init(void)
{
      if (init_net.proc_net != NULL) {
            hostap_proc = proc_mkdir("hostap", init_net.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", init_net.proc_net);
      }
}


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_80211_header_parse);
EXPORT_SYMBOL(hostap_80211_get_hdrlen);
EXPORT_SYMBOL(hostap_get_stats);
EXPORT_SYMBOL(hostap_setup_dev);
EXPORT_SYMBOL(hostap_set_multicast_list_queue);
EXPORT_SYMBOL(hostap_set_hostapd);
EXPORT_SYMBOL(hostap_set_hostapd_sta);
EXPORT_SYMBOL(hostap_add_interface);
EXPORT_SYMBOL(hostap_remove_interface);
EXPORT_SYMBOL(prism2_update_comms_qual);

module_init(hostap_init);
module_exit(hostap_exit);

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