4149b72eaa
Workaround another device firmware bug, wherein CDC descriptors get placed in a wrong place never previously observed in the wild. Fix a bug where a seeming RNDIS device returns a bogus response during device initialization. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
587 lines
16 KiB
C
587 lines
16 KiB
C
/*
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* CDC Ethernet based networking peripherals
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* Copyright (C) 2003-2005 by David Brownell
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* Copyright (C) 2006 by Ole Andre Vadla Ravnas (ActiveSync)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// #define DEBUG // error path messages, extra info
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// #define VERBOSE // more; success messages
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ctype.h>
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#include <linux/ethtool.h>
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#include <linux/workqueue.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include "usbnet.h"
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#if defined(CONFIG_USB_NET_RNDIS_HOST) || defined(CONFIG_USB_NET_RNDIS_HOST_MODULE)
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static int is_rndis(struct usb_interface_descriptor *desc)
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{
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return desc->bInterfaceClass == USB_CLASS_COMM
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&& desc->bInterfaceSubClass == 2
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&& desc->bInterfaceProtocol == 0xff;
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}
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static int is_activesync(struct usb_interface_descriptor *desc)
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{
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return desc->bInterfaceClass == USB_CLASS_MISC
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&& desc->bInterfaceSubClass == 1
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&& desc->bInterfaceProtocol == 1;
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}
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#else
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#define is_rndis(desc) 0
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#define is_activesync(desc) 0
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#endif
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/*
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* probes control interface, claims data interface, collects the bulk
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* endpoints, activates data interface (if needed), maybe sets MTU.
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* all pure cdc, except for certain firmware workarounds, and knowing
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* that rndis uses one different rule.
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*/
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int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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u8 *buf = intf->cur_altsetting->extra;
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int len = intf->cur_altsetting->extralen;
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struct usb_interface_descriptor *d;
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struct cdc_state *info = (void *) &dev->data;
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int status;
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int rndis;
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struct usb_driver *driver = driver_of(intf);
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if (sizeof dev->data < sizeof *info)
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return -EDOM;
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/* expect strict spec conformance for the descriptors, but
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* cope with firmware which stores them in the wrong place
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*/
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if (len == 0 && dev->udev->actconfig->extralen) {
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/* Motorola SB4100 (and others: Brad Hards says it's
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* from a Broadcom design) put CDC descriptors here
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*/
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buf = dev->udev->actconfig->extra;
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len = dev->udev->actconfig->extralen;
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if (len)
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dev_dbg(&intf->dev,
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"CDC descriptors on config\n");
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}
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/* Maybe CDC descriptors are after the endpoint? This bug has
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* been seen on some 2Wire Inc RNDIS-ish products.
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*/
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if (len == 0) {
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struct usb_host_endpoint *hep;
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hep = intf->cur_altsetting->endpoint;
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if (hep) {
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buf = hep->extra;
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len = hep->extralen;
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}
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if (len)
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dev_dbg(&intf->dev,
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"CDC descriptors on endpoint\n");
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}
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/* this assumes that if there's a non-RNDIS vendor variant
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* of cdc-acm, it'll fail RNDIS requests cleanly.
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*/
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rndis = is_rndis(&intf->cur_altsetting->desc)
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|| is_activesync(&intf->cur_altsetting->desc);
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memset(info, 0, sizeof *info);
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info->control = intf;
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while (len > 3) {
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if (buf [1] != USB_DT_CS_INTERFACE)
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goto next_desc;
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/* use bDescriptorSubType to identify the CDC descriptors.
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* We expect devices with CDC header and union descriptors.
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* For CDC Ethernet we need the ethernet descriptor.
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* For RNDIS, ignore two (pointless) CDC modem descriptors
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* in favor of a complicated OID-based RPC scheme doing what
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* CDC Ethernet achieves with a simple descriptor.
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*/
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switch (buf [2]) {
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case USB_CDC_HEADER_TYPE:
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if (info->header) {
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dev_dbg(&intf->dev, "extra CDC header\n");
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goto bad_desc;
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}
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info->header = (void *) buf;
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if (info->header->bLength != sizeof *info->header) {
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dev_dbg(&intf->dev, "CDC header len %u\n",
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info->header->bLength);
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goto bad_desc;
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}
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break;
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case USB_CDC_ACM_TYPE:
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/* paranoia: disambiguate a "real" vendor-specific
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* modem interface from an RNDIS non-modem.
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*/
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if (rndis) {
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struct usb_cdc_acm_descriptor *d;
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d = (void *) buf;
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if (d->bmCapabilities) {
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dev_dbg(&intf->dev,
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"ACM capabilities %02x, "
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"not really RNDIS?\n",
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d->bmCapabilities);
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goto bad_desc;
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}
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}
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break;
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case USB_CDC_UNION_TYPE:
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if (info->u) {
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dev_dbg(&intf->dev, "extra CDC union\n");
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goto bad_desc;
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}
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info->u = (void *) buf;
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if (info->u->bLength != sizeof *info->u) {
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dev_dbg(&intf->dev, "CDC union len %u\n",
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info->u->bLength);
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goto bad_desc;
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}
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/* we need a master/control interface (what we're
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* probed with) and a slave/data interface; union
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* descriptors sort this all out.
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*/
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info->control = usb_ifnum_to_if(dev->udev,
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info->u->bMasterInterface0);
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info->data = usb_ifnum_to_if(dev->udev,
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info->u->bSlaveInterface0);
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if (!info->control || !info->data) {
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dev_dbg(&intf->dev,
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"master #%u/%p slave #%u/%p\n",
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info->u->bMasterInterface0,
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info->control,
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info->u->bSlaveInterface0,
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info->data);
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goto bad_desc;
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}
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if (info->control != intf) {
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dev_dbg(&intf->dev, "bogus CDC Union\n");
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/* Ambit USB Cable Modem (and maybe others)
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* interchanges master and slave interface.
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*/
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if (info->data == intf) {
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info->data = info->control;
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info->control = intf;
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} else
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goto bad_desc;
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}
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/* a data interface altsetting does the real i/o */
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d = &info->data->cur_altsetting->desc;
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if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {
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dev_dbg(&intf->dev, "slave class %u\n",
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d->bInterfaceClass);
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goto bad_desc;
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}
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break;
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case USB_CDC_ETHERNET_TYPE:
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if (info->ether) {
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dev_dbg(&intf->dev, "extra CDC ether\n");
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goto bad_desc;
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}
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info->ether = (void *) buf;
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if (info->ether->bLength != sizeof *info->ether) {
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dev_dbg(&intf->dev, "CDC ether len %u\n",
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info->ether->bLength);
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goto bad_desc;
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}
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dev->hard_mtu = le16_to_cpu(
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info->ether->wMaxSegmentSize);
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/* because of Zaurus, we may be ignoring the host
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* side link address we were given.
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*/
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break;
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}
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next_desc:
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len -= buf [0]; /* bLength */
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buf += buf [0];
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}
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/* Microsoft ActiveSync based RNDIS devices lack the CDC descriptors,
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* so we'll hard-wire the interfaces and not check for descriptors.
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*/
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if (is_activesync(&intf->cur_altsetting->desc) && !info->u) {
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info->control = usb_ifnum_to_if(dev->udev, 0);
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info->data = usb_ifnum_to_if(dev->udev, 1);
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if (!info->control || !info->data) {
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dev_dbg(&intf->dev,
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"activesync: master #0/%p slave #1/%p\n",
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info->control,
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info->data);
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goto bad_desc;
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}
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} else if (!info->header || !info->u || (!rndis && !info->ether)) {
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dev_dbg(&intf->dev, "missing cdc %s%s%sdescriptor\n",
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info->header ? "" : "header ",
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info->u ? "" : "union ",
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info->ether ? "" : "ether ");
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goto bad_desc;
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}
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/* claim data interface and set it up ... with side effects.
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* network traffic can't flow until an altsetting is enabled.
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*/
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status = usb_driver_claim_interface(driver, info->data, dev);
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if (status < 0)
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return status;
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status = usbnet_get_endpoints(dev, info->data);
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if (status < 0) {
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/* ensure immediate exit from usbnet_disconnect */
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usb_set_intfdata(info->data, NULL);
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usb_driver_release_interface(driver, info->data);
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return status;
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}
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/* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */
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dev->status = NULL;
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if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {
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struct usb_endpoint_descriptor *desc;
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dev->status = &info->control->cur_altsetting->endpoint [0];
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desc = &dev->status->desc;
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if (!usb_endpoint_is_int_in(desc)
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|| (le16_to_cpu(desc->wMaxPacketSize)
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< sizeof(struct usb_cdc_notification))
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|| !desc->bInterval) {
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dev_dbg(&intf->dev, "bad notification endpoint\n");
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dev->status = NULL;
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}
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}
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if (rndis && !dev->status) {
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dev_dbg(&intf->dev, "missing RNDIS status endpoint\n");
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usb_set_intfdata(info->data, NULL);
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usb_driver_release_interface(driver, info->data);
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return -ENODEV;
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}
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return 0;
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bad_desc:
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dev_info(&dev->udev->dev, "bad CDC descriptors\n");
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(usbnet_generic_cdc_bind);
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void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct cdc_state *info = (void *) &dev->data;
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struct usb_driver *driver = driver_of(intf);
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/* disconnect master --> disconnect slave */
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if (intf == info->control && info->data) {
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/* ensure immediate exit from usbnet_disconnect */
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usb_set_intfdata(info->data, NULL);
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usb_driver_release_interface(driver, info->data);
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info->data = NULL;
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}
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/* and vice versa (just in case) */
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else if (intf == info->data && info->control) {
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/* ensure immediate exit from usbnet_disconnect */
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usb_set_intfdata(info->control, NULL);
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usb_driver_release_interface(driver, info->control);
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info->control = NULL;
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}
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}
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EXPORT_SYMBOL_GPL(usbnet_cdc_unbind);
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/*-------------------------------------------------------------------------
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*
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* Communications Device Class, Ethernet Control model
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*
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* Takes two interfaces. The DATA interface is inactive till an altsetting
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* is selected. Configuration data includes class descriptors. There's
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* an optional status endpoint on the control interface.
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*
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* This should interop with whatever the 2.4 "CDCEther.c" driver
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* (by Brad Hards) talked with, with more functionality.
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*
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*-------------------------------------------------------------------------*/
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static void dumpspeed(struct usbnet *dev, __le32 *speeds)
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{
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if (netif_msg_timer(dev))
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devinfo(dev, "link speeds: %u kbps up, %u kbps down",
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__le32_to_cpu(speeds[0]) / 1000,
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__le32_to_cpu(speeds[1]) / 1000);
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}
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static void cdc_status(struct usbnet *dev, struct urb *urb)
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{
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struct usb_cdc_notification *event;
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if (urb->actual_length < sizeof *event)
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return;
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/* SPEED_CHANGE can get split into two 8-byte packets */
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if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
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dumpspeed(dev, (__le32 *) urb->transfer_buffer);
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return;
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}
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event = urb->transfer_buffer;
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switch (event->bNotificationType) {
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case USB_CDC_NOTIFY_NETWORK_CONNECTION:
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if (netif_msg_timer(dev))
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devdbg(dev, "CDC: carrier %s",
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event->wValue ? "on" : "off");
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if (event->wValue)
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netif_carrier_on(dev->net);
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else
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netif_carrier_off(dev->net);
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break;
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case USB_CDC_NOTIFY_SPEED_CHANGE: /* tx/rx rates */
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if (netif_msg_timer(dev))
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devdbg(dev, "CDC: speed change (len %d)",
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urb->actual_length);
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if (urb->actual_length != (sizeof *event + 8))
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set_bit(EVENT_STS_SPLIT, &dev->flags);
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else
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dumpspeed(dev, (__le32 *) &event[1]);
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break;
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/* USB_CDC_NOTIFY_RESPONSE_AVAILABLE can happen too (e.g. RNDIS),
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* but there are no standard formats for the response data.
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*/
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default:
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deverr(dev, "CDC: unexpected notification %02x!",
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event->bNotificationType);
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break;
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}
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}
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static u8 nibble(unsigned char c)
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{
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if (likely(isdigit(c)))
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return c - '0';
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c = toupper(c);
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if (likely(isxdigit(c)))
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return 10 + c - 'A';
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return 0;
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}
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static inline int
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get_ethernet_addr(struct usbnet *dev, struct usb_cdc_ether_desc *e)
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{
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int tmp, i;
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unsigned char buf [13];
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tmp = usb_string(dev->udev, e->iMACAddress, buf, sizeof buf);
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if (tmp != 12) {
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dev_dbg(&dev->udev->dev,
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"bad MAC string %d fetch, %d\n", e->iMACAddress, tmp);
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if (tmp >= 0)
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tmp = -EINVAL;
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return tmp;
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}
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for (i = tmp = 0; i < 6; i++, tmp += 2)
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dev->net->dev_addr [i] =
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(nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]);
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return 0;
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}
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static int cdc_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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int status;
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struct cdc_state *info = (void *) &dev->data;
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status = usbnet_generic_cdc_bind(dev, intf);
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if (status < 0)
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return status;
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status = get_ethernet_addr(dev, info->ether);
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if (status < 0) {
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usb_set_intfdata(info->data, NULL);
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usb_driver_release_interface(driver_of(intf), info->data);
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return status;
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}
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/* FIXME cdc-ether has some multicast code too, though it complains
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* in routine cases. info->ether describes the multicast support.
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* Implement that here, manipulating the cdc filter as needed.
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*/
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return 0;
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}
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static const struct driver_info cdc_info = {
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.description = "CDC Ethernet Device",
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.flags = FLAG_ETHER,
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// .check_connect = cdc_check_connect,
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.bind = cdc_bind,
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.unbind = usbnet_cdc_unbind,
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.status = cdc_status,
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};
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/*-------------------------------------------------------------------------*/
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static const struct usb_device_id products [] = {
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/*
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* BLACKLIST !!
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*
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* First blacklist any products that are egregiously nonconformant
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* with the CDC Ethernet specs. Minor braindamage we cope with; when
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* they're not even trying, needing a separate driver is only the first
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* of the differences to show up.
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*/
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#define ZAURUS_MASTER_INTERFACE \
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.bInterfaceClass = USB_CLASS_COMM, \
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.bInterfaceSubClass = USB_CDC_SUBCLASS_ETHERNET, \
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.bInterfaceProtocol = USB_CDC_PROTO_NONE
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/* SA-1100 based Sharp Zaurus ("collie"), or compatible;
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* wire-incompatible with true CDC Ethernet implementations.
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* (And, it seems, needlessly so...)
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*/
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{
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.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
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| USB_DEVICE_ID_MATCH_DEVICE,
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.idVendor = 0x04DD,
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.idProduct = 0x8004,
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ZAURUS_MASTER_INTERFACE,
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.driver_info = 0,
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},
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/* PXA-25x based Sharp Zaurii. Note that it seems some of these
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* (later models especially) may have shipped only with firmware
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* advertising false "CDC MDLM" compatibility ... but we're not
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* clear which models did that, so for now let's assume the worst.
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*/
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{
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.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
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| USB_DEVICE_ID_MATCH_DEVICE,
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.idVendor = 0x04DD,
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.idProduct = 0x8005, /* A-300 */
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ZAURUS_MASTER_INTERFACE,
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.driver_info = 0,
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}, {
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.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
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| USB_DEVICE_ID_MATCH_DEVICE,
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.idVendor = 0x04DD,
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.idProduct = 0x8006, /* B-500/SL-5600 */
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ZAURUS_MASTER_INTERFACE,
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.driver_info = 0,
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}, {
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.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
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| USB_DEVICE_ID_MATCH_DEVICE,
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.idVendor = 0x04DD,
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.idProduct = 0x8007, /* C-700 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x9031, /* C-750 C-760 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
.idProduct = 0x9032, /* SL-6000 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
}, {
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x04DD,
|
||
/* reported with some C860 units */
|
||
.idProduct = 0x9050, /* C-860 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
},
|
||
|
||
/* Olympus has some models with a Zaurus-compatible option.
|
||
* R-1000 uses a FreeScale i.MXL cpu (ARMv4T)
|
||
*/
|
||
{
|
||
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO
|
||
| USB_DEVICE_ID_MATCH_DEVICE,
|
||
.idVendor = 0x07B4,
|
||
.idProduct = 0x0F02, /* R-1000 */
|
||
ZAURUS_MASTER_INTERFACE,
|
||
.driver_info = 0,
|
||
},
|
||
|
||
/*
|
||
* WHITELIST!!!
|
||
*
|
||
* CDC Ether uses two interfaces, not necessarily consecutive.
|
||
* We match the main interface, ignoring the optional device
|
||
* class so we could handle devices that aren't exclusively
|
||
* CDC ether.
|
||
*
|
||
* NOTE: this match must come AFTER entries blacklisting devices
|
||
* because of bugs/quirks in a given product (like Zaurus, above).
|
||
*/
|
||
{
|
||
USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ETHERNET,
|
||
USB_CDC_PROTO_NONE),
|
||
.driver_info = (unsigned long) &cdc_info,
|
||
},
|
||
{ }, // END
|
||
};
|
||
MODULE_DEVICE_TABLE(usb, products);
|
||
|
||
static struct usb_driver cdc_driver = {
|
||
.name = "cdc_ether",
|
||
.id_table = products,
|
||
.probe = usbnet_probe,
|
||
.disconnect = usbnet_disconnect,
|
||
.suspend = usbnet_suspend,
|
||
.resume = usbnet_resume,
|
||
};
|
||
|
||
|
||
static int __init cdc_init(void)
|
||
{
|
||
BUILD_BUG_ON((sizeof(((struct usbnet *)0)->data)
|
||
< sizeof(struct cdc_state)));
|
||
|
||
return usb_register(&cdc_driver);
|
||
}
|
||
module_init(cdc_init);
|
||
|
||
static void __exit cdc_exit(void)
|
||
{
|
||
usb_deregister(&cdc_driver);
|
||
}
|
||
module_exit(cdc_exit);
|
||
|
||
MODULE_AUTHOR("David Brownell");
|
||
MODULE_DESCRIPTION("USB CDC Ethernet devices");
|
||
MODULE_LICENSE("GPL");
|