p80211netdev.c

对于无线网卡采用prism芯片的linux的开源驱动.

}



/*----------------------------------------------------------------
* register_wlandev
*
* Roughly matches the functionality of register_netdev.  This function
* is called after the driver has successfully probed and set up the
* resources for the device.  It's now ready to become a named device
* in the Linux system.
*
* First we allocate a name for the device (if not already set), then
* we call the Linux function register_netdevice.
*
* Arguments:
*	wlandev		ptr to the wlandev structure for the
*			interface.
* Returns: 
*	zero on success, non-zero otherwise.
* Call Context:
*	Can be either interrupt or not.
----------------------------------------------------------------*/
int register_wlandev(wlandevice_t *wlandev)
{
	int		i = 0;
	netdevice_t	*dev = wlandev->netdev;

	DBFENTER;

	i = dev_alloc_name(wlandev->netdev, "wlan%d");
	if (i >= 0) {
		i = register_netdev(wlandev->netdev);
	} 
	if (i != 0) {
		return -EIO;
	}

#if ( LINUX_VERSION_CODE < KERNEL_VERSION(2,4,0) )
	dev->name = wlandev->name;
#else
	strcpy(wlandev->name, dev->name);
#endif

#ifdef CONFIG_PROC_FS
	if (proc_p80211) {
		wlandev->procdir = proc_mkdir(wlandev->name, proc_p80211);
		if ( wlandev->procdir )
			wlandev->procwlandev = 
				create_proc_read_entry("wlandev", 0,
						       wlandev->procdir,
						       p80211netdev_proc_read,
						       wlandev);
		if (wlandev->nsd_proc_read)
			create_proc_read_entry("nsd", 0,
					       wlandev->procdir,
					       wlandev->nsd_proc_read,
					       wlandev);
	}
#endif

#ifdef CONFIG_HOTPLUG
	p80211_run_sbin_hotplug(wlandev, WLAN_HOTPLUG_REGISTER);
#endif

	DBFEXIT;
	return 0;
}


/*----------------------------------------------------------------
* unregister_wlandev
*
* Roughly matches the functionality of unregister_netdev.  This
* function is called to remove a named device from the system.
*
* First we tell linux that the device should no longer exist.
* Then we remove it from the list of known wlan devices.
*
* Arguments:
*	wlandev		ptr to the wlandev structure for the
*			interface.
* Returns: 
*	zero on success, non-zero otherwise.
* Call Context:
*	Can be either interrupt or not.
----------------------------------------------------------------*/
int unregister_wlandev(wlandevice_t *wlandev)
{
	struct sk_buff *skb;

	DBFENTER;

#ifdef CONFIG_HOTPLUG
	p80211_run_sbin_hotplug(wlandev, WLAN_HOTPLUG_REMOVE);
#endif

#ifdef CONFIG_PROC_FS
	if ( wlandev->procwlandev ) {
		remove_proc_entry("wlandev", wlandev->procdir);
	}
	if ( wlandev->nsd_proc_read ) {
		remove_proc_entry("nsd", wlandev->procdir);
	}
	if (wlandev->procdir) {
		remove_proc_entry(wlandev->name, proc_p80211);
	}
#endif

	unregister_netdev(wlandev->netdev);

	/* Now to clean out the rx queue */
	while ( (skb = skb_dequeue(&wlandev->nsd_rxq)) ) {
		dev_kfree_skb(skb);
	}

	DBFEXIT;
	return 0;
}

#ifdef CONFIG_PROC_FS
/*----------------------------------------------------------------
* proc_read
*
* Read function for /proc/net/p80211/<device>/wlandev
*
* Arguments:
*	buf
*	start 
*	offset 
*	count
*	eof
*	data
* Returns: 
*	zero on success, non-zero otherwise.
* Call Context:
*	Can be either interrupt or not.
----------------------------------------------------------------*/
static int
p80211netdev_proc_read(
	char	*page, 
	char	**start, 
	off_t	offset, 
	int	count,
	int	*eof,
	void	*data)
{
	char	 *p = page;
	wlandevice_t *wlandev = (wlandevice_t *) data;

	DBFENTER;
	if (offset != 0) {
		*eof = 1;
		goto exit;
	} 

	p += sprintf(p, "p80211 version: %s (%s)\n\n", 
		     WLAN_RELEASE, WLAN_BUILD_DATE);
	p += sprintf(p, "name       : %s\n", wlandev->name);
	p += sprintf(p, "nsd name   : %s\n", wlandev->nsdname);
	p += sprintf(p, "address    : %02x:%02x:%02x:%02x:%02x:%02x\n",
		     wlandev->netdev->dev_addr[0], wlandev->netdev->dev_addr[1], wlandev->netdev->dev_addr[2],
		     wlandev->netdev->dev_addr[3], wlandev->netdev->dev_addr[4], wlandev->netdev->dev_addr[5]);
	p += sprintf(p, "nsd caps   : %s%s%s%s%s%s%s%s%s%s\n",  
		     (wlandev->nsdcaps & P80211_NSDCAP_HARDWAREWEP) ? "wep_hw " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_TIEDWEP) ? "wep_tied " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_NOHOSTWEP) ? "wep_hw_only " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_PBCC) ? "pbcc " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_SHORT_PREAMBLE) ? "short_preamble " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_AGILITY) ? "agility " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_AP_RETRANSMIT) ? "ap_retransmit " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_HWFRAGMENT) ? "hw_frag " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_AUTOJOIN) ? "autojoin " : "",
		     (wlandev->nsdcaps & P80211_NSDCAP_NOSCAN) ? "" : "scan ");


	p += sprintf(p, "bssid      : %02x:%02x:%02x:%02x:%02x:%02x\n",
		     wlandev->bssid[0], wlandev->bssid[1], wlandev->bssid[2],
		     wlandev->bssid[3], wlandev->bssid[4], wlandev->bssid[5]);

	p += sprintf(p, "Enabled    : %s%s\n", 
		     (wlandev->shortpreamble) ? "short_preamble " : "",
		     (wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) ? "privacy" : "");


 exit:
	DBFEXIT;
	return (p - page);
}
#endif

/*----------------------------------------------------------------
* p80211netdev_hwremoved
*
* Hardware removed notification. This function should be called
* immediately after an MSD has detected that the underlying hardware
* has been yanked out from under us.  The primary things we need
* to do are:
*   - Mark the wlandev
*   - Prevent any further traffic from the knetdev i/f
*   - Prevent any further requests from mgmt i/f
*   - If there are any waitq'd mgmt requests or mgmt-frame exchanges,
*     shut them down.
*   - Call the MSD hwremoved function.
*
* The remainder of the cleanup will be handled by unregister().
* Our primary goal here is to prevent as much tickling of the MSD
* as possible since the MSD is already in a 'wounded' state.
*
* TODO: As new features are added, this function should be 
*       updated.
*
* Arguments:
*	wlandev		WLAN network device structure
* Returns: 
*	nothing
* Side effects:
*
* Call context:
*	Usually interrupt.
----------------------------------------------------------------*/
void p80211netdev_hwremoved(wlandevice_t *wlandev)
{
	DBFENTER;
	wlandev->hwremoved = 1;
	if ( wlandev->state == WLAN_DEVICE_OPEN) {
		p80211netdev_stop_queue(wlandev);
	}

	netif_device_detach(wlandev->netdev);

	DBFEXIT;
}


/*----------------------------------------------------------------
* p80211_rx_typedrop
*
* Classifies the frame, increments the appropriate counter, and
* returns 0|1|2 indicating whether the driver should handle, ignore, or
* drop the frame
*
* Arguments:
*	wlandev		wlan device structure
*	fc		frame control field
*
* Returns: 
*	zero if the frame should be handled by the driver,
*       one if the frame should be ignored
*       anything else means we drop it.
*
* Side effects:
*
* Call context:
*	interrupt
----------------------------------------------------------------*/
int p80211_rx_typedrop( wlandevice_t *wlandev, UINT16 fc)
{
	UINT16	ftype;
	UINT16	fstype;
	int	drop = 0;
	/* Classify frame, increment counter */
	ftype = WLAN_GET_FC_FTYPE(fc);
	fstype = WLAN_GET_FC_FSTYPE(fc);
#if 0
	WLAN_LOG_DEBUG(4, 
		"rx_typedrop : ftype=%d fstype=%d.\n", ftype, fstype);
#endif
	switch ( ftype ) {
	case WLAN_FTYPE_MGMT:
		if ((wlandev->netdev->flags & IFF_PROMISC) ||
			(wlandev->netdev->flags & IFF_ALLMULTI)) {
			drop = 1;
			break;
		}
		WLAN_LOG_DEBUG(3, "rx'd mgmt:\n");
		wlandev->rx.mgmt++;
		switch( fstype ) {
		case WLAN_FSTYPE_ASSOCREQ:
			/* printk("assocreq"); */
			wlandev->rx.assocreq++;
			break;
		case WLAN_FSTYPE_ASSOCRESP:
			/* printk("assocresp"); */
			wlandev->rx.assocresp++;
			break;
		case WLAN_FSTYPE_REASSOCREQ:
			/* printk("reassocreq"); */
			wlandev->rx.reassocreq++;
			break;
		case WLAN_FSTYPE_REASSOCRESP:
			/* printk("reassocresp"); */
			wlandev->rx.reassocresp++;
			break;
		case WLAN_FSTYPE_PROBEREQ:
			/* printk("probereq"); */
			wlandev->rx.probereq++;
			break;
		case WLAN_FSTYPE_PROBERESP:
			/* printk("proberesp"); */
			wlandev->rx.proberesp++;
			break;
		case WLAN_FSTYPE_BEACON:
			/* printk("beacon"); */
			wlandev->rx.beacon++;
			break;
		case WLAN_FSTYPE_ATIM:
			/* printk("atim"); */
			wlandev->rx.atim++;
			break;
		case WLAN_FSTYPE_DISASSOC:
			/* printk("disassoc"); */
			wlandev->rx.disassoc++;
			break;
		case WLAN_FSTYPE_AUTHEN:
			/* printk("authen"); */
			wlandev->rx.authen++;
			break;
		case WLAN_FSTYPE_DEAUTHEN:
			/* printk("deauthen"); */
			wlandev->rx.deauthen++;
			break;
		default:
			/* printk("unknown"); */
			wlandev->rx.mgmt_unknown++;
			break;
		}
		/* printk("\n"); */
		drop = 2;
		break;

	case WLAN_FTYPE_CTL:
		if ((wlandev->netdev->flags & IFF_PROMISC) ||
			(wlandev->netdev->flags & IFF_ALLMULTI)) {
			drop = 1;
			break;
		}
		WLAN_LOG_DEBUG(3, "rx'd ctl:\n");
		wlandev->rx.ctl++;
		switch( fstype ) {
		case WLAN_FSTYPE_PSPOLL:
			/* printk("pspoll"); */
			wlandev->rx.pspoll++;
			break;
		case WLAN_FSTYPE_RTS:
			/* printk("rts"); */
			wlandev->rx.rts++;
			break;
		case WLAN_FSTYPE_CTS:
			/* printk("cts"); */
			wlandev->rx.cts++;
			break;
		case WLAN_FSTYPE_ACK:
			/* printk("ack"); */
			wlandev->rx.ack++;
			break;
		case WLAN_FSTYPE_CFEND:
			/* printk("cfend"); */
			wlandev->rx.cfend++;
			break;
		case WLAN_FSTYPE_CFENDCFACK:
			/* printk("cfendcfack"); */
			wlandev->rx.cfendcfack++;
			break;
		default:
			/* printk("unknown"); */
			wlandev->rx.ctl_unknown++;
			break;
		}
		/* printk("\n"); */
		drop = 2;
		break;

	case WLAN_FTYPE_DATA:
		wlandev->rx.data++;
		switch( fstype ) {
		case WLAN_FSTYPE_DATAONLY:
			wlandev->rx.dataonly++;
			break;
		case WLAN_FSTYPE_DATA_CFACK:
			wlandev->rx.data_cfack++;
			break;
		case WLAN_FSTYPE_DATA_CFPOLL:
			wlandev->rx.data_cfpoll++;
			break;
		case WLAN_FSTYPE_DATA_CFACK_CFPOLL:
			wlandev->rx.data__cfack_cfpoll++;
			break;
		case WLAN_FSTYPE_NULL:
			WLAN_LOG_DEBUG(3, "rx'd data:null\n");
			wlandev->rx.null++;
			break;
		case WLAN_FSTYPE_CFACK:
			WLAN_LOG_DEBUG(3, "rx'd data:cfack\n");
			wlandev->rx.cfack++;
			break;
		case WLAN_FSTYPE_CFPOLL:
			WLAN_LOG_DEBUG(3, "rx'd data:cfpoll\n");
			wlandev->rx.cfpoll++;
			break;
		case WLAN_FSTYPE_CFACK_CFPOLL:
			WLAN_LOG_DEBUG(3, "rx'd data:cfack_cfpoll\n");
			wlandev->rx.cfack_cfpoll++;
			break;
		default:
			/* printk("unknown"); */
			wlandev->rx.data_unknown++;
			break;
		}

		break;
	}
	return drop;
}

#ifdef CONFIG_HOTPLUG
/* Notify userspace when a netdevice event occurs,
 * by running '/sbin/hotplug net' with certain
 * environment variables set.
 */
int p80211_run_sbin_hotplug(wlandevice_t *wlandev, char *action)
{
        char *argv[3], *envp[7], ifname[12 + IFNAMSIZ], action_str[32];
	char nsdname[32], wlan_wext[32];
        int i;

	if (wlandev) {
		sprintf(ifname, "INTERFACE=%s", wlandev->name);
		sprintf(nsdname, "NSDNAME=%s", wlandev->nsdname);
	} else {
		sprintf(ifname, "INTERFACE=null");
		sprintf(nsdname, "NSDNAME=null");
	}

	sprintf(wlan_wext, "WLAN_WEXT=%s", wlan_wext_write ? "y" : "");
        sprintf(action_str, "ACTION=%s", action);

        i = 0;
        argv[i++] = hotplug_path;
        argv[i++] = "wlan";
        argv[i] = NULL;

        i = 0;
        /* minimal command environment */
        envp [i++] = "HOME=/";
        envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
        envp [i++] = ifname;
        envp [i++] = action_str;
        envp [i++] = nsdname;
        envp [i++] = wlan_wext;
        envp [i] = NULL;
        
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,62)) 
        return call_usermodehelper(argv [0], argv, envp);
#else
        return call_usermodehelper(argv [0], argv, envp, 0);
#endif
}

#endif


void    p80211_suspend(wlandevice_t *wlandev)
{
	DBFENTER;
      
#ifdef CONFIG_HOTPLUG
	p80211_run_sbin_hotplug(wlandev, WLAN_HOTPLUG_SUSPEND);
#endif
 
	DBFEXIT;
}
 
void    p80211_resume(wlandevice_t *wlandev)
{
	DBFENTER;

#ifdef CONFIG_HOTPLUG
	p80211_run_sbin_hotplug(wlandev, WLAN_HOTPLUG_RESUME);
#endif

	DBFEXIT;
}

void p80211knetdev_tx_timeout( netdevice_t *netdev) 
{
	wlandevice_t	*wlandev = (wlandevice_t*)netdev->priv;
	DBFENTER;

	if (wlandev->tx_timeout) {
		wlandev->tx_timeout(wlandev);
	} else {
		WLAN_LOG_WARNING("Implement tx_timeout for %s\n",
				 wlandev->nsdname);
		p80211netdev_wake_queue(wlandev);
	}

	DBFEXIT;
}