/* * CDC Ethernet based networking peripherals * Copyright (C) 2003-2005 by David Brownell * Copyright (C) 2006 by Ole Andre Vadla Ravnas (ActiveSync) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 */ // #define	DEBUG			// error path messages, extra info// #define	VERBOSE			// more; success messages #include <linux/module.h>#include <linux/init.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/ethtool.h>#include <linux/workqueue.h>#include <linux/mii.h>#include <linux/usb.h>#include <linux/usb/cdc.h>#include <linux/usb/usbnet.h>  #if defined(CONFIG_USB_NET_RNDIS_HOST) || defined(CONFIG_USB_NET_RNDIS_HOST_MODULE) static int is_rndis(struct usb_interface_descriptor *desc){	return (desc->bInterfaceClass == USB_CLASS_COMM &&		desc->bInterfaceSubClass == 2 &&		desc->bInterfaceProtocol == 0xff);} static int is_activesync(struct usb_interface_descriptor *desc){	return (desc->bInterfaceClass == USB_CLASS_MISC &&		desc->bInterfaceSubClass == 1 &&		desc->bInterfaceProtocol == 1);} static int is_wireless_rndis(struct usb_interface_descriptor *desc){	return (desc->bInterfaceClass == USB_CLASS_WIRELESS_CONTROLLER &&		desc->bInterfaceSubClass == 1 &&		desc->bInterfaceProtocol == 3);} #else #define is_rndis(desc)		0#define is_activesync(desc)	0#define is_wireless_rndis(desc)	0 #endif static const u8 mbm_guid[16] = {	0xa3, 0x17, 0xa8, 0x8b, 0x04, 0x5e, 0x4f, 0x01,	0xa6, 0x07, 0xc0, 0xff, 0xcb, 0x7e, 0x39, 0x2a,}; /* * probes control interface, claims data interface, collects the bulk * endpoints, activates data interface (if needed), maybe sets MTU. * all pure cdc, except for certain firmware workarounds, and knowing * that rndis uses one different rule. */int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf){	u8				*buf = intf->cur_altsetting->extra;	int				len = intf->cur_altsetting->extralen;	struct usb_interface_descriptor	*d;	struct cdc_state		*info = (void *) &dev->data;	int				status;	int				rndis;	bool				android_rndis_quirk = false;	struct usb_driver		*driver = driver_of(intf);	struct usb_cdc_mdlm_desc	*desc = NULL;	struct usb_cdc_mdlm_detail_desc *detail = NULL; 	if (sizeof dev->data < sizeof *info)		return -EDOM; 	/* expect strict spec conformance for the descriptors, but	 * cope with firmware which stores them in the wrong place	 */	if (len == 0 && dev->udev->actconfig->extralen) {		/* Motorola SB4100 (and others: Brad Hards says it's		 * from a Broadcom design) put CDC descriptors here		 */		buf = dev->udev->actconfig->extra;		len = dev->udev->actconfig->extralen;		dev_dbg(&intf->dev, "CDC descriptors on config\n");	} 	/* Maybe CDC descriptors are after the endpoint?  This bug has	 * been seen on some 2Wire Inc RNDIS-ish products.	 */	if (len == 0) {		struct usb_host_endpoint	*hep; 		hep = intf->cur_altsetting->endpoint;		if (hep) {			buf = hep->extra;			len = hep->extralen;		}		if (len)			dev_dbg(&intf->dev,				"CDC descriptors on endpoint\n");	} 	/* this assumes that if there's a non-RNDIS vendor variant	 * of cdc-acm, it'll fail RNDIS requests cleanly.	 */	rndis = (is_rndis(&intf->cur_altsetting->desc) ||		 is_activesync(&intf->cur_altsetting->desc) ||		 is_wireless_rndis(&intf->cur_altsetting->desc)); 	memset(info, 0, sizeof *info);	info->control = intf;	while (len > 3) {		if (buf [1] != USB_DT_CS_INTERFACE)			goto next_desc; 		/* use bDescriptorSubType to identify the CDC descriptors.		 * We expect devices with CDC header and union descriptors.		 * For CDC Ethernet we need the ethernet descriptor.		 * For RNDIS, ignore two (pointless) CDC modem descriptors		 * in favor of a complicated OID-based RPC scheme doing what		 * CDC Ethernet achieves with a simple descriptor.		 */		switch (buf [2]) {		case USB_CDC_HEADER_TYPE:			if (info->header) {				dev_dbg(&intf->dev, "extra CDC header\n");				goto bad_desc;			}			info->header = (void *) buf;			if (info->header->bLength != sizeof *info->header) {				dev_dbg(&intf->dev, "CDC header len %u\n",					info->header->bLength);				goto bad_desc;			}			break;		case USB_CDC_ACM_TYPE:			/* paranoia:  disambiguate a "real" vendor-specific			 * modem interface from an RNDIS non-modem.			 */			if (rndis) {				struct usb_cdc_acm_descriptor *acm; 				acm = (void *) buf;				if (acm->bmCapabilities) {					dev_dbg(&intf->dev,						"ACM capabilities %02x, "						"not really RNDIS?\n",						acm->bmCapabilities);					goto bad_desc;				}			}			break;		case USB_CDC_UNION_TYPE:			if (info->u) {				dev_dbg(&intf->dev, "extra CDC union\n");				goto bad_desc;			}			info->u = (void *) buf;			if (info->u->bLength != sizeof *info->u) {				dev_dbg(&intf->dev, "CDC union len %u\n",					info->u->bLength);				goto bad_desc;			} 			/* we need a master/control interface (what we're			 * probed with) and a slave/data interface; union			 * descriptors sort this all out.			 */			info->control = usb_ifnum_to_if(dev->udev,						info->u->bMasterInterface0);			info->data = usb_ifnum_to_if(dev->udev,						info->u->bSlaveInterface0);			if (!info->control || !info->data) {				dev_dbg(&intf->dev,					"master #%u/%p slave #%u/%p\n",					info->u->bMasterInterface0,					info->control,					info->u->bSlaveInterface0,					info->data);				/* fall back to hard-wiring for RNDIS */				if (rndis) {					android_rndis_quirk = true;					goto next_desc;				}				goto bad_desc;			}			if (info->control != intf) {				dev_dbg(&intf->dev, "bogus CDC Union\n");				/* Ambit USB Cable Modem (and maybe others)				 * interchanges master and slave interface.				 */				if (info->data == intf) {					info->data = info->control;					info->control = intf;				} else					goto bad_desc;			} 			/* a data interface altsetting does the real i/o */			d = &info->data->cur_altsetting->desc;			if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {				dev_dbg(&intf->dev, "slave class %u\n",					d->bInterfaceClass);				goto bad_desc;			}			break;		case USB_CDC_ETHERNET_TYPE:			if (info->ether) {				dev_dbg(&intf->dev, "extra CDC ether\n");				goto bad_desc;			}			info->ether = (void *) buf;			if (info->ether->bLength != sizeof *info->ether) {				dev_dbg(&intf->dev, "CDC ether len %u\n",					info->ether->bLength);				goto bad_desc;			}			dev->hard_mtu = le16_to_cpu(						info->ether->wMaxSegmentSize);			/* because of Zaurus, we may be ignoring the host			 * side link address we were given.			 */			break;		case USB_CDC_MDLM_TYPE:			if (desc) {				dev_dbg(&intf->dev, "extra MDLM descriptor\n");				goto bad_desc;			} 			desc = (void *)buf; 			if (desc->bLength != sizeof(*desc))				goto bad_desc; 			if (memcmp(&desc->bGUID, mbm_guid, 16))				goto bad_desc;			break;		case USB_CDC_MDLM_DETAIL_TYPE:			if (detail) {				dev_dbg(&intf->dev, "extra MDLM detail descriptor\n");				goto bad_desc;			} 			detail = (void *)buf; 			if (detail->bGuidDescriptorType == 0) {				if (detail->bLength < (sizeof(*detail) + 1))					goto bad_desc;			} else				goto bad_desc;			break;		}next_desc:		len -= buf [0];	/* bLength */		buf += buf [0];	} 	/* Microsoft ActiveSync based and some regular RNDIS devices lack the	 * CDC descriptors, so we'll hard-wire the interfaces and not check	 * for descriptors.	 *	 * Some Android RNDIS devices have a CDC Union descriptor pointing	 * to non-existing interfaces.  Ignore that and attempt the same	 * hard-wired 0 and 1 interfaces.	 */	if (rndis && (!info->u || android_rndis_quirk)) {		info->control = usb_ifnum_to_if(dev->udev, 0);		info->data = usb_ifnum_to_if(dev->udev, 1);		if (!info->control || !info->data || info->control != intf) {			dev_dbg(&intf->dev,				"rndis: master #0/%p slave #1/%p\n",				info->control,				info->data);			goto bad_desc;		} 	} else if (!info->header || !info->u || (!rndis && !info->ether)) {		dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",			info->header ? "" : "header ",			info->u ? "" : "union ",			info->ether ? "" : "ether ");		goto bad_desc;	} 	/* claim data interface and set it up ... with side effects.	 * network traffic can't flow until an altsetting is enabled.	 */	status = usb_driver_claim_interface(driver, info->data, dev);	if (status < 0)		return status;	status = usbnet_get_endpoints(dev, info->data);	if (status < 0) {		/* ensure immediate exit from usbnet_disconnect */		usb_set_intfdata(info->data, NULL);		usb_driver_release_interface(driver, info->data);		return status;	} 	/* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */	dev->status = NULL;	if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {		struct usb_endpoint_descriptor	*desc; 		dev->status = &info->control->cur_altsetting->endpoint [0];		desc = &dev->status->desc;		if (!usb_endpoint_is_int_in(desc) ||		    (le16_to_cpu(desc->wMaxPacketSize)		     < sizeof(struct usb_cdc_notification)) ||		    !desc->bInterval) {			dev_dbg(&intf->dev, "bad notification endpoint\n");			dev->status = NULL;		}	}	if (rndis && !dev->status) {		dev_dbg(&intf->dev, "missing RNDIS status endpoint\n");		usb_set_intfdata(info->data, NULL);		usb_driver_release_interface(driver, info->data);		return -ENODEV;	}	return 0; bad_desc:	dev_info(&dev->udev->dev, "bad CDC descriptors\n");	return -ENODEV;}EXPORT_SYMBOL_GPL(usbnet_generic_cdc_bind); void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf){	struct cdc_state		*info = (void *) &dev->data;	struct usb_driver		*driver = driver_of(intf); 	/* disconnect master --> disconnect slave */	if (intf == info->control && info->data) {		/* ensure immediate exit from usbnet_disconnect */		usb_set_intfdata(info->data, NULL);		usb_driver_release_interface(driver, info->data);		info->data = NULL;	} 	/* and vice versa (just in case) */	else if (intf == info->data && info->control) {		/* ensure immediate exit from usbnet_disconnect */		usb_set_intfdata(info->control, NULL);		usb_driver_release_interface(driver, info->control);		info->control = NULL;	}}EXPORT_SYMBOL_GPL(usbnet_cdc_unbind); /*------------------------------------------------------------------------- * * Communications Device Class, Ethernet Control model * * Takes two interfaces.  The DATA interface is inactive till an altsetting * is selected.  Configuration data includes class descriptors.  There's * an optional status endpoint on the control interface. * * This should interop with whatever the 2.4 "CDCEther.c" driver * (by Brad Hards) talked with, with more functionality. * *-------------------------------------------------------------------------*/ static void dumpspeed(struct usbnet *dev, __le32 *speeds){	netif_info(dev, timer, dev->net,		   "link speeds: %u kbps up, %u kbps down\n",		   __le32_to_cpu(speeds[0]) / 1000,		   __le32_to_cpu(speeds[1]) / 1000);} void usbnet_cdc_status(struct usbnet *dev, struct urb *urb){	struct usb_cdc_notification	*event; 	if (urb->actual_length < sizeof *event)		return; 	/* SPEED_CHANGE can get split into two 8-byte packets */	if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {		dumpspeed(dev, (__le32 *) urb->transfer_buffer);		return;	} 	event = urb->transfer_buffer;	switch (event->bNotificationType) {	case USB_CDC_NOTIFY_NETWORK_CONNECTION:		netif_dbg(dev, timer, dev->net, "CDC: carrier %s\n",			  event->wValue ? "on" : "off");		if (event->wValue)			netif_carrier_on(dev->net);		else			netif_carrier_off(dev->net);		break;	case USB_CDC_NOTIFY_SPEED_CHANGE:	/* tx/rx rates */		netif_dbg(dev, timer, dev->net, "CDC: speed change (len %d)\n",			  urb->actual_length);		if (urb->actual_length != (sizeof *event + 8))			set_bit(EVENT_STS_SPLIT, &dev->flags);		else			dumpspeed(dev, (__le32 *) &event[1]);		break;	/* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),	 * but there are no standard formats for the response data.	 */	default:		netdev_err(dev->net, "CDC: unexpected notification %02x!\n",			   event->bNotificationType);		break;	}}EXPORT_SYMBOL_GPL(usbnet_cdc_status); int usbnet_cdc_bind(struct usbnet *dev, struct usb_interface *intf){	int				status;	struct cdc_state		*info = (void *) &dev->data; 	BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data)			< sizeof(struct cdc_state))); 	status = usbnet_generic_cdc_bind(dev, intf);	if (status < 0)		return status; 	status = usbnet_get_ethernet_addr(dev, info->ether->iMACAddress);	if (status < 0) {		usb_set_intfdata(info->data, NULL);		usb_driver_release_interface(driver_of(intf), info->data);		return status;	} 	/* FIXME cdc-ether has some multicast code too, though it complains	 * in routine cases.  info->ether describes the multicast support.	 * Implement that here, manipulating the cdc filter as needed.	 */	return 0;}EXPORT_SYMBOL_GPL(usbnet_cdc_bind); static int cdc_manage_power(struct usbnet *dev, int on){	dev->intf->needs_remote_wakeup = on;	return 0;} static const struct driver_info	cdc_info = {	.description =	"CDC Ethernet Device",	.flags =	FLAG_ETHER | FLAG_POINTTOPOINT,	// .check_connect = cdc_check_connect,	.bind =		usbnet_cdc_bind,	.unbind =	usbnet_cdc_unbind,	.status =	usbnet_cdc_status,	.manage_power =	cdc_manage_power,}; static const struct driver_info wwan_info = {	.description =	"Mobile Broadband Network Device",	.flags =	FLAG_WWAN,	.bind =		usbnet_cdc_bind,	.unbind =	usbnet_cdc_unbind,	.status =	usbnet_cdc_status,	.manage_power =	cdc_manage_power,}; /*-------------------------------------------------------------------------*/ #define HUAWEI_VENDOR_ID	0x12D1#define NOVATEL_VENDOR_ID	0x1410#define ZTE_VENDOR_ID		0x19D2 static const struct usb_device_id	products [] = {/* * BLACKLIST !! * * First blacklist any products that are egregiously nonconformant * with the CDC Ethernet specs.  Minor braindamage we cope with; when * they're not even trying, needing a separate driver is only the first * of the differences to show up. */ 

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