/*******************************************************************************

  Copyright(c) 2004 Intel Corporation. All rights reserved.

  Portions of this file are based on the WEP enablement code provided by the
  Host AP project hostap-drivers v0.1.3
  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 version 2 of the GNU General Public License as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 59
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.

  The full GNU General Public License is included in this distribution in the
  file called LICENSE.

  Contact Information:
  James P. Ketrenos <ipw2100-admin@linux.intel.com>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include <linux/compiler.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/in6.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/tcp.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <linux/uaccess.h>
#include <net/arp.h>

#include "rtllib.h"


#define DRV_NAME "rtllib_92e"

void _setup_timer(struct timer_list *ptimer, void *fun, unsigned long data)
{
	ptimer->function = fun;
	ptimer->data = data;
	init_timer(ptimer);
}

static inline int rtllib_networks_allocate(struct rtllib_device *ieee)
{
	if (ieee->networks)
		return 0;

	ieee->networks = kzalloc(
		MAX_NETWORK_COUNT * sizeof(struct rtllib_network),
		GFP_KERNEL);
	if (!ieee->networks) {
		printk(KERN_WARNING "%s: Out of memory allocating beacons\n",
		       ieee->dev->name);
		return -ENOMEM;
	}

	return 0;
}

static inline void rtllib_networks_free(struct rtllib_device *ieee)
{
	if (!ieee->networks)
		return;
	kfree(ieee->networks);
	ieee->networks = NULL;
}

static inline void rtllib_networks_initialize(struct rtllib_device *ieee)
{
	int i;

	INIT_LIST_HEAD(&ieee->network_free_list);
	INIT_LIST_HEAD(&ieee->network_list);
	for (i = 0; i < MAX_NETWORK_COUNT; i++)
		list_add_tail(&ieee->networks[i].list,
			      &ieee->network_free_list);
}

struct net_device *alloc_rtllib(int sizeof_priv)
{
	struct rtllib_device *ieee = NULL;
	struct net_device *dev;
	int i, err;

	RTLLIB_DEBUG_INFO("Initializing...\n");

	dev = alloc_etherdev(sizeof(struct rtllib_device) + sizeof_priv);
	if (!dev) {
		RTLLIB_ERROR("Unable to network device.\n");
		goto failed;
	}
	ieee = (struct rtllib_device *)netdev_priv_rsl(dev);
	memset(ieee, 0, sizeof(struct rtllib_device)+sizeof_priv);
	ieee->dev = dev;

	err = rtllib_networks_allocate(ieee);
	if (err) {
		RTLLIB_ERROR("Unable to allocate beacon storage: %d\n",
				err);
		goto failed;
	}
	rtllib_networks_initialize(ieee);


	/* Default fragmentation threshold is maximum payload size */
	ieee->fts = DEFAULT_FTS;
	ieee->scan_age = DEFAULT_MAX_SCAN_AGE;
	ieee->open_wep = 1;

	/* Default to enabling full open WEP with host based encrypt/decrypt */
	ieee->host_encrypt = 1;
	ieee->host_decrypt = 1;
	ieee->ieee802_1x = 1; /* Default to supporting 802.1x */

	INIT_LIST_HEAD(&ieee->crypt_deinit_list);
	_setup_timer(&ieee->crypt_deinit_timer,
		    rtllib_crypt_deinit_handler,
		    (unsigned long) ieee);
	ieee->rtllib_ap_sec_type = rtllib_ap_sec_type;

	spin_lock_init(&ieee->lock);
	spin_lock_init(&ieee->wpax_suitlist_lock);
	spin_lock_init(&ieee->bw_spinlock);
	spin_lock_init(&ieee->reorder_spinlock);
	atomic_set(&(ieee->atm_chnlop), 0);
	atomic_set(&(ieee->atm_swbw), 0);

	ieee->bHalfNMode = false;
	ieee->wpa_enabled = 0;
	ieee->tkip_countermeasures = 0;
	ieee->drop_unencrypted = 0;
	ieee->privacy_invoked = 0;
	ieee->ieee802_1x = 1;
	ieee->raw_tx = 0;
	ieee->hwsec_active = 0;

	memset(ieee->swcamtable, 0, sizeof(struct sw_cam_table) * 32);
	rtllib_softmac_init(ieee);

	ieee->pHTInfo = kzalloc(sizeof(struct rt_hi_throughput), GFP_KERNEL);
	if (ieee->pHTInfo == NULL) {
		RTLLIB_DEBUG(RTLLIB_DL_ERR, "can't alloc memory for HTInfo\n");
		return NULL;
	}
	HTUpdateDefaultSetting(ieee);
	HTInitializeHTInfo(ieee);
	TSInitialize(ieee);
	for (i = 0; i < IEEE_IBSS_MAC_HASH_SIZE; i++)
		INIT_LIST_HEAD(&ieee->ibss_mac_hash[i]);

	for (i = 0; i < 17; i++) {
		ieee->last_rxseq_num[i] = -1;
		ieee->last_rxfrag_num[i] = -1;
		ieee->last_packet_time[i] = 0;
	}

	rtllib_tkip_null();
	rtllib_wep_null();
	rtllib_ccmp_null();

	return dev;

 failed:
	if (dev)
		free_netdev(dev);
	return NULL;
}

void free_rtllib(struct net_device *dev)
{
	struct rtllib_device *ieee = (struct rtllib_device *)
				      netdev_priv_rsl(dev);
	int i;

	kfree(ieee->pHTInfo);
	ieee->pHTInfo = NULL;
	rtllib_softmac_free(ieee);
	del_timer_sync(&ieee->crypt_deinit_timer);
	rtllib_crypt_deinit_entries(ieee, 1);

	for (i = 0; i < WEP_KEYS; i++) {
		struct rtllib_crypt_data *crypt = ieee->crypt[i];
		if (crypt) {
			if (crypt->ops)
				crypt->ops->deinit(crypt->priv);
			kfree(crypt);
			ieee->crypt[i] = NULL;
		}
	}

	rtllib_networks_free(ieee);
	free_netdev(dev);
}

u32 rtllib_debug_level;
static int debug = \
			    RTLLIB_DL_ERR
			    ;
static struct proc_dir_entry *rtllib_proc;

static int show_debug_level(char *page, char **start, off_t offset,
			    int count, int *eof, void *data)
{
	return snprintf(page, count, "0x%08X\n", rtllib_debug_level);
}

static int store_debug_level(struct file *file, const char __user *buffer,
			     unsigned long count, void *data)
{
	char buf[] = "0x00000000";
	unsigned long len = min((unsigned long)sizeof(buf) - 1, count);
	char *p = (char *)buf;
	unsigned long val;

	if (copy_from_user(buf, buffer, len))
		return count;
	buf[len] = 0;
	if (p[1] == 'x' || p[1] == 'X' || p[0] == 'x' || p[0] == 'X') {
		p++;
		if (p[0] == 'x' || p[0] == 'X')
			p++;
		val = simple_strtoul(p, &p, 16);
	} else
		val = simple_strtoul(p, &p, 10);
	if (p == buf)
		printk(KERN_INFO DRV_NAME
		       ": %s is not in hex or decimal form.\n", buf);
	else
		rtllib_debug_level = val;

	return strnlen(buf, count);
}

int __init rtllib_init(void)
{
	struct proc_dir_entry *e;

	rtllib_debug_level = debug;
	rtllib_proc = create_proc_entry(DRV_NAME, S_IFDIR, init_net.proc_net);
	if (rtllib_proc == NULL) {
		RTLLIB_ERROR("Unable to create " DRV_NAME
				" proc directory\n");
		return -EIO;
	}
	e = create_proc_entry("debug_level", S_IFREG | S_IRUGO | S_IWUSR,
			      rtllib_proc);
	if (!e) {
		remove_proc_entry(DRV_NAME, init_net.proc_net);
		rtllib_proc = NULL;
		return -EIO;
	}
	e->read_proc = show_debug_level;
	e->write_proc = store_debug_level;
	e->data = NULL;

	return 0;
}

void __exit rtllib_exit(void)
{
	if (rtllib_proc) {
		remove_proc_entry("debug_level", rtllib_proc);
		remove_proc_entry(DRV_NAME, init_net.proc_net);
		rtllib_proc = NULL;
	}
}