hostap_main.c

linux内核源码

/*
 * 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
 * <[e-mail]>
 * Copyright (c) 2002-2005, Jouni Malinen <[e-mail]>
 *
 * 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",