+++ /dev/null
-/*
- * f_rndis.c -- RNDIS link function driver
- *
- * Copyright (C) 2003-2005,2008 David Brownell
- * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
- * Copyright (C) 2008 Nokia Corporation
- * Copyright (C) 2009 Samsung Electronics
- * Author: Michal Nazarewicz (mina86@mina86.com)
- *
- * 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.
- */
-
-/* #define VERBOSE_DEBUG */
-
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/etherdevice.h>
-
-#include <linux/atomic.h>
-
-#include "u_ether.h"
-#include "u_ether_configfs.h"
-#include "u_rndis.h"
-#include "rndis.h"
-#include "configfs.h"
-
-/*
- * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
- * been promoted instead of the standard CDC Ethernet. The published RNDIS
- * spec is ambiguous, incomplete, and needlessly complex. Variants such as
- * ActiveSync have even worse status in terms of specification.
- *
- * In short: it's a protocol controlled by (and for) Microsoft, not for an
- * Open ecosystem or markets. Linux supports it *only* because Microsoft
- * doesn't support the CDC Ethernet standard.
- *
- * The RNDIS data transfer model is complex, with multiple Ethernet packets
- * per USB message, and out of band data. The control model is built around
- * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
- * (modem, not Ethernet) veneer, with those ACM descriptors being entirely
- * useless (they're ignored). RNDIS expects to be the only function in its
- * configuration, so it's no real help if you need composite devices; and
- * it expects to be the first configuration too.
- *
- * There is a single technical advantage of RNDIS over CDC Ethernet, if you
- * discount the fluff that its RPC can be made to deliver: it doesn't need
- * a NOP altsetting for the data interface. That lets it work on some of the
- * "so smart it's stupid" hardware which takes over configuration changes
- * from the software, and adds restrictions like "no altsettings".
- *
- * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and
- * have all sorts of contrary-to-specification oddities that can prevent
- * them from working sanely. Since bugfixes (or accurate specs, letting
- * Linux work around those bugs) are unlikely to ever come from MSFT, you
- * may want to avoid using RNDIS on purely operational grounds.
- *
- * Omissions from the RNDIS 1.0 specification include:
- *
- * - Power management ... references data that's scattered around lots
- * of other documentation, which is incorrect/incomplete there too.
- *
- * - There are various undocumented protocol requirements, like the need
- * to send garbage in some control-OUT messages.
- *
- * - MS-Windows drivers sometimes emit undocumented requests.
- */
-
-struct f_rndis {
- struct gether port;
- u8 ctrl_id, data_id;
- u8 ethaddr[ETH_ALEN];
- u32 vendorID;
- const char *manufacturer;
- int config;
-
- struct usb_ep *notify;
- struct usb_request *notify_req;
- atomic_t notify_count;
-};
-
-static inline struct f_rndis *func_to_rndis(struct usb_function *f)
-{
- return container_of(f, struct f_rndis, port.func);
-}
-
-/* peak (theoretical) bulk transfer rate in bits-per-second */
-static unsigned int bitrate(struct usb_gadget *g)
-{
- if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
- return 13 * 1024 * 8 * 1000 * 8;
- else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
- return 13 * 512 * 8 * 1000 * 8;
- else
- return 19 * 64 * 1 * 1000 * 8;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- */
-
-#define RNDIS_STATUS_INTERVAL_MS 32
-#define STATUS_BYTECOUNT 8 /* 8 bytes data */
-
-
-/* interface descriptor: */
-
-static struct usb_interface_descriptor rndis_control_intf = {
- .bLength = sizeof rndis_control_intf,
- .bDescriptorType = USB_DT_INTERFACE,
-
- /* .bInterfaceNumber = DYNAMIC */
- /* status endpoint is optional; this could be patched later */
- .bNumEndpoints = 1,
- .bInterfaceClass = USB_CLASS_COMM,
- .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
- .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
- /* .iInterface = DYNAMIC */
-};
-
-static struct usb_cdc_header_desc header_desc = {
- .bLength = sizeof header_desc,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = USB_CDC_HEADER_TYPE,
-
- .bcdCDC = cpu_to_le16(0x0110),
-};
-
-static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
- .bLength = sizeof call_mgmt_descriptor,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
-
- .bmCapabilities = 0x00,
- .bDataInterface = 0x01,
-};
-
-static struct usb_cdc_acm_descriptor rndis_acm_descriptor = {
- .bLength = sizeof rndis_acm_descriptor,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = USB_CDC_ACM_TYPE,
-
- .bmCapabilities = 0x00,
-};
-
-static struct usb_cdc_union_desc rndis_union_desc = {
- .bLength = sizeof(rndis_union_desc),
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = USB_CDC_UNION_TYPE,
- /* .bMasterInterface0 = DYNAMIC */
- /* .bSlaveInterface0 = DYNAMIC */
-};
-
-/* the data interface has two bulk endpoints */
-
-static struct usb_interface_descriptor rndis_data_intf = {
- .bLength = sizeof rndis_data_intf,
- .bDescriptorType = USB_DT_INTERFACE,
-
- /* .bInterfaceNumber = DYNAMIC */
- .bNumEndpoints = 2,
- .bInterfaceClass = USB_CLASS_CDC_DATA,
- .bInterfaceSubClass = 0,
- .bInterfaceProtocol = 0,
- /* .iInterface = DYNAMIC */
-};
-
-
-static struct usb_interface_assoc_descriptor
-rndis_iad_descriptor = {
- .bLength = sizeof rndis_iad_descriptor,
- .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
-
- .bFirstInterface = 0, /* XXX, hardcoded */
- .bInterfaceCount = 2, // control + data
- .bFunctionClass = USB_CLASS_COMM,
- .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
- .bFunctionProtocol = USB_CDC_PROTO_NONE,
- /* .iFunction = DYNAMIC */
-};
-
-/* full speed support: */
-
-static struct usb_endpoint_descriptor fs_notify_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_INT,
- .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
- .bInterval = RNDIS_STATUS_INTERVAL_MS,
-};
-
-static struct usb_endpoint_descriptor fs_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
-};
-
-static struct usb_endpoint_descriptor fs_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
-};
-
-static struct usb_descriptor_header *eth_fs_function[] = {
- (struct usb_descriptor_header *) &rndis_iad_descriptor,
-
- /* control interface matches ACM, not Ethernet */
- (struct usb_descriptor_header *) &rndis_control_intf,
- (struct usb_descriptor_header *) &header_desc,
- (struct usb_descriptor_header *) &call_mgmt_descriptor,
- (struct usb_descriptor_header *) &rndis_acm_descriptor,
- (struct usb_descriptor_header *) &rndis_union_desc,
- (struct usb_descriptor_header *) &fs_notify_desc,
-
- /* data interface has no altsetting */
- (struct usb_descriptor_header *) &rndis_data_intf,
- (struct usb_descriptor_header *) &fs_in_desc,
- (struct usb_descriptor_header *) &fs_out_desc,
- NULL,
-};
-
-/* high speed support: */
-
-static struct usb_endpoint_descriptor hs_notify_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_INT,
- .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
- .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
-};
-
-static struct usb_endpoint_descriptor hs_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = cpu_to_le16(512),
-};
-
-static struct usb_endpoint_descriptor hs_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = cpu_to_le16(512),
-};
-
-static struct usb_descriptor_header *eth_hs_function[] = {
- (struct usb_descriptor_header *) &rndis_iad_descriptor,
-
- /* control interface matches ACM, not Ethernet */
- (struct usb_descriptor_header *) &rndis_control_intf,
- (struct usb_descriptor_header *) &header_desc,
- (struct usb_descriptor_header *) &call_mgmt_descriptor,
- (struct usb_descriptor_header *) &rndis_acm_descriptor,
- (struct usb_descriptor_header *) &rndis_union_desc,
- (struct usb_descriptor_header *) &hs_notify_desc,
-
- /* data interface has no altsetting */
- (struct usb_descriptor_header *) &rndis_data_intf,
- (struct usb_descriptor_header *) &hs_in_desc,
- (struct usb_descriptor_header *) &hs_out_desc,
- NULL,
-};
-
-/* super speed support: */
-
-static struct usb_endpoint_descriptor ss_notify_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_INT,
- .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
- .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
-};
-
-static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = {
- .bLength = sizeof ss_intr_comp_desc,
- .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
-
- /* the following 3 values can be tweaked if necessary */
- /* .bMaxBurst = 0, */
- /* .bmAttributes = 0, */
- .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT),
-};
-
-static struct usb_endpoint_descriptor ss_in_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_IN,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = cpu_to_le16(1024),
-};
-
-static struct usb_endpoint_descriptor ss_out_desc = {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
-
- .bEndpointAddress = USB_DIR_OUT,
- .bmAttributes = USB_ENDPOINT_XFER_BULK,
- .wMaxPacketSize = cpu_to_le16(1024),
-};
-
-static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = {
- .bLength = sizeof ss_bulk_comp_desc,
- .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
-
- /* the following 2 values can be tweaked if necessary */
- /* .bMaxBurst = 0, */
- /* .bmAttributes = 0, */
-};
-
-static struct usb_descriptor_header *eth_ss_function[] = {
- (struct usb_descriptor_header *) &rndis_iad_descriptor,
-
- /* control interface matches ACM, not Ethernet */
- (struct usb_descriptor_header *) &rndis_control_intf,
- (struct usb_descriptor_header *) &header_desc,
- (struct usb_descriptor_header *) &call_mgmt_descriptor,
- (struct usb_descriptor_header *) &rndis_acm_descriptor,
- (struct usb_descriptor_header *) &rndis_union_desc,
- (struct usb_descriptor_header *) &ss_notify_desc,
- (struct usb_descriptor_header *) &ss_intr_comp_desc,
-
- /* data interface has no altsetting */
- (struct usb_descriptor_header *) &rndis_data_intf,
- (struct usb_descriptor_header *) &ss_in_desc,
- (struct usb_descriptor_header *) &ss_bulk_comp_desc,
- (struct usb_descriptor_header *) &ss_out_desc,
- (struct usb_descriptor_header *) &ss_bulk_comp_desc,
- NULL,
-};
-
-/* string descriptors: */
-
-static struct usb_string rndis_string_defs[] = {
- [0].s = "RNDIS Communications Control",
- [1].s = "RNDIS Ethernet Data",
- [2].s = "RNDIS",
- { } /* end of list */
-};
-
-static struct usb_gadget_strings rndis_string_table = {
- .language = 0x0409, /* en-us */
- .strings = rndis_string_defs,
-};
-
-static struct usb_gadget_strings *rndis_strings[] = {
- &rndis_string_table,
- NULL,
-};
-
-/*-------------------------------------------------------------------------*/
-
-static struct sk_buff *rndis_add_header(struct gether *port,
- struct sk_buff *skb)
-{
- struct sk_buff *skb2;
-
- skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
- if (skb2)
- rndis_add_hdr(skb2);
-
- dev_kfree_skb(skb);
- return skb2;
-}
-
-static void rndis_response_available(void *_rndis)
-{
- struct f_rndis *rndis = _rndis;
- struct usb_request *req = rndis->notify_req;
- struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
- __le32 *data = req->buf;
- int status;
-
- if (atomic_inc_return(&rndis->notify_count) != 1)
- return;
-
- /* Send RNDIS RESPONSE_AVAILABLE notification; a
- * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too
- *
- * This is the only notification defined by RNDIS.
- */
- data[0] = cpu_to_le32(1);
- data[1] = cpu_to_le32(0);
-
- status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
- if (status) {
- atomic_dec(&rndis->notify_count);
- DBG(cdev, "notify/0 --> %d\n", status);
- }
-}
-
-static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct f_rndis *rndis = req->context;
- struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
- int status = req->status;
-
- /* after TX:
- * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control)
- * - RNDIS_RESPONSE_AVAILABLE (status/irq)
- */
- switch (status) {
- case -ECONNRESET:
- case -ESHUTDOWN:
- /* connection gone */
- atomic_set(&rndis->notify_count, 0);
- break;
- default:
- DBG(cdev, "RNDIS %s response error %d, %d/%d\n",
- ep->name, status,
- req->actual, req->length);
- /* FALLTHROUGH */
- case 0:
- if (ep != rndis->notify)
- break;
-
- /* handle multiple pending RNDIS_RESPONSE_AVAILABLE
- * notifications by resending until we're done
- */
- if (atomic_dec_and_test(&rndis->notify_count))
- break;
- status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
- if (status) {
- atomic_dec(&rndis->notify_count);
- DBG(cdev, "notify/1 --> %d\n", status);
- }
- break;
- }
-}
-
-static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct f_rndis *rndis = req->context;
- int status;
-
- /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
-// spin_lock(&dev->lock);
- status = rndis_msg_parser(rndis->config, (u8 *) req->buf);
- if (status < 0)
- pr_err("RNDIS command error %d, %d/%d\n",
- status, req->actual, req->length);
-// spin_unlock(&dev->lock);
-}
-
-static int
-rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
-{
- struct f_rndis *rndis = func_to_rndis(f);
- struct usb_composite_dev *cdev = f->config->cdev;
- struct usb_request *req = cdev->req;
- int value = -EOPNOTSUPP;
- u16 w_index = le16_to_cpu(ctrl->wIndex);
- u16 w_value = le16_to_cpu(ctrl->wValue);
- u16 w_length = le16_to_cpu(ctrl->wLength);
-
- /* composite driver infrastructure handles everything except
- * CDC class messages; interface activation uses set_alt().
- */
- switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
-
- /* RNDIS uses the CDC command encapsulation mechanism to implement
- * an RPC scheme, with much getting/setting of attributes by OID.
- */
- case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
- | USB_CDC_SEND_ENCAPSULATED_COMMAND:
- if (w_value || w_index != rndis->ctrl_id)
- goto invalid;
- /* read the request; process it later */
- value = w_length;
- req->complete = rndis_command_complete;
- req->context = rndis;
- /* later, rndis_response_available() sends a notification */
- break;
-
- case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
- | USB_CDC_GET_ENCAPSULATED_RESPONSE:
- if (w_value || w_index != rndis->ctrl_id)
- goto invalid;
- else {
- u8 *buf;
- u32 n;
-
- /* return the result */
- buf = rndis_get_next_response(rndis->config, &n);
- if (buf) {
- memcpy(req->buf, buf, n);
- req->complete = rndis_response_complete;
- req->context = rndis;
- rndis_free_response(rndis->config, buf);
- value = n;
- }
- /* else stalls ... spec says to avoid that */
- }
- break;
-
- default:
-invalid:
- VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
- }
-
- /* respond with data transfer or status phase? */
- if (value >= 0) {
- DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- w_value, w_index, w_length);
- req->zero = (value < w_length);
- req->length = value;
- value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
- if (value < 0)
- ERROR(cdev, "rndis response on err %d\n", value);
- }
-
- /* device either stalls (value < 0) or reports success */
- return value;
-}
-
-
-static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
-{
- struct f_rndis *rndis = func_to_rndis(f);
- struct usb_composite_dev *cdev = f->config->cdev;
-
- /* we know alt == 0 */
-
- if (intf == rndis->ctrl_id) {
- if (rndis->notify->driver_data) {
- VDBG(cdev, "reset rndis control %d\n", intf);
- usb_ep_disable(rndis->notify);
- }
- if (!rndis->notify->desc) {
- VDBG(cdev, "init rndis ctrl %d\n", intf);
- if (config_ep_by_speed(cdev->gadget, f, rndis->notify))
- goto fail;
- }
- usb_ep_enable(rndis->notify);
- rndis->notify->driver_data = rndis;
-
- } else if (intf == rndis->data_id) {
- struct net_device *net;
-
- if (rndis->port.in_ep->driver_data) {
- DBG(cdev, "reset rndis\n");
- gether_disconnect(&rndis->port);
- }
-
- if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) {
- DBG(cdev, "init rndis\n");
- if (config_ep_by_speed(cdev->gadget, f,
- rndis->port.in_ep) ||
- config_ep_by_speed(cdev->gadget, f,
- rndis->port.out_ep)) {
- rndis->port.in_ep->desc = NULL;
- rndis->port.out_ep->desc = NULL;
- goto fail;
- }
- }
-
- /* Avoid ZLPs; they can be troublesome. */
- rndis->port.is_zlp_ok = false;
-
- /* RNDIS should be in the "RNDIS uninitialized" state,
- * either never activated or after rndis_uninit().
- *
- * We don't want data to flow here until a nonzero packet
- * filter is set, at which point it enters "RNDIS data
- * initialized" state ... but we do want the endpoints
- * to be activated. It's a strange little state.
- *
- * REVISIT the RNDIS gadget code has done this wrong for a
- * very long time. We need another call to the link layer
- * code -- gether_updown(...bool) maybe -- to do it right.
- */
- rndis->port.cdc_filter = 0;
-
- DBG(cdev, "RNDIS RX/TX early activation ... \n");
- net = gether_connect(&rndis->port);
- if (IS_ERR(net))
- return PTR_ERR(net);
-
- rndis_set_param_dev(rndis->config, net,
- &rndis->port.cdc_filter);
- } else
- goto fail;
-
- return 0;
-fail:
- return -EINVAL;
-}
-
-static void rndis_disable(struct usb_function *f)
-{
- struct f_rndis *rndis = func_to_rndis(f);
- struct usb_composite_dev *cdev = f->config->cdev;
-
- if (!rndis->notify->driver_data)
- return;
-
- DBG(cdev, "rndis deactivated\n");
-
- rndis_uninit(rndis->config);
- gether_disconnect(&rndis->port);
-
- usb_ep_disable(rndis->notify);
- rndis->notify->driver_data = NULL;
-}
-
-/*-------------------------------------------------------------------------*/
-
-/*
- * This isn't quite the same mechanism as CDC Ethernet, since the
- * notification scheme passes less data, but the same set of link
- * states must be tested. A key difference is that altsettings are
- * not used to tell whether the link should send packets or not.
- */
-
-static void rndis_open(struct gether *geth)
-{
- struct f_rndis *rndis = func_to_rndis(&geth->func);
- struct usb_composite_dev *cdev = geth->func.config->cdev;
-
- DBG(cdev, "%s\n", __func__);
-
- rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3,
- bitrate(cdev->gadget) / 100);
- rndis_signal_connect(rndis->config);
-}
-
-static void rndis_close(struct gether *geth)
-{
- struct f_rndis *rndis = func_to_rndis(&geth->func);
-
- DBG(geth->func.config->cdev, "%s\n", __func__);
-
- rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
- rndis_signal_disconnect(rndis->config);
-}
-
-/*-------------------------------------------------------------------------*/
-
-/* Some controllers can't support RNDIS ... */
-static inline bool can_support_rndis(struct usb_configuration *c)
-{
- /* everything else is *presumably* fine */
- return true;
-}
-
-/* ethernet function driver setup/binding */
-
-static int
-rndis_bind(struct usb_configuration *c, struct usb_function *f)
-{
- struct usb_composite_dev *cdev = c->cdev;
- struct f_rndis *rndis = func_to_rndis(f);
- struct usb_string *us;
- int status;
- struct usb_ep *ep;
-
- struct f_rndis_opts *rndis_opts;
-
- if (!can_support_rndis(c))
- return -EINVAL;
-
- rndis_opts = container_of(f->fi, struct f_rndis_opts, func_inst);
-
- if (cdev->use_os_string) {
- f->os_desc_table = kzalloc(sizeof(*f->os_desc_table),
- GFP_KERNEL);
- if (!f->os_desc_table)
- return PTR_ERR(f->os_desc_table);
- f->os_desc_n = 1;
- f->os_desc_table[0].os_desc = &rndis_opts->rndis_os_desc;
- }
-
- /*
- * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
- * configurations are bound in sequence with list_for_each_entry,
- * in each configuration its functions are bound in sequence
- * with list_for_each_entry, so we assume no race condition
- * with regard to rndis_opts->bound access
- */
- if (!rndis_opts->bound) {
- gether_set_gadget(rndis_opts->net, cdev->gadget);
- status = gether_register_netdev(rndis_opts->net);
- if (status)
- goto fail;
- rndis_opts->bound = true;
- }
-
- us = usb_gstrings_attach(cdev, rndis_strings,
- ARRAY_SIZE(rndis_string_defs));
- if (IS_ERR(us)) {
- status = PTR_ERR(us);
- goto fail;
- }
- rndis_control_intf.iInterface = us[0].id;
- rndis_data_intf.iInterface = us[1].id;
- rndis_iad_descriptor.iFunction = us[2].id;
-
- /* allocate instance-specific interface IDs */
- status = usb_interface_id(c, f);
- if (status < 0)
- goto fail;
- rndis->ctrl_id = status;
- rndis_iad_descriptor.bFirstInterface = status;
-
- rndis_control_intf.bInterfaceNumber = status;
- rndis_union_desc.bMasterInterface0 = status;
-
- status = usb_interface_id(c, f);
- if (status < 0)
- goto fail;
- rndis->data_id = status;
-
- rndis_data_intf.bInterfaceNumber = status;
- rndis_union_desc.bSlaveInterface0 = status;
-
- status = -ENODEV;
-
- /* allocate instance-specific endpoints */
- ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc);
- if (!ep)
- goto fail;
- rndis->port.in_ep = ep;
- ep->driver_data = cdev; /* claim */
-
- ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc);
- if (!ep)
- goto fail;
- rndis->port.out_ep = ep;
- ep->driver_data = cdev; /* claim */
-
- /* NOTE: a status/notification endpoint is, strictly speaking,
- * optional. We don't treat it that way though! It's simpler,
- * and some newer profiles don't treat it as optional.
- */
- ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc);
- if (!ep)
- goto fail;
- rndis->notify = ep;
- ep->driver_data = cdev; /* claim */
-
- status = -ENOMEM;
-
- /* allocate notification request and buffer */
- rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
- if (!rndis->notify_req)
- goto fail;
- rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL);
- if (!rndis->notify_req->buf)
- goto fail;
- rndis->notify_req->length = STATUS_BYTECOUNT;
- rndis->notify_req->context = rndis;
- rndis->notify_req->complete = rndis_response_complete;
-
- /* support all relevant hardware speeds... we expect that when
- * hardware is dual speed, all bulk-capable endpoints work at
- * both speeds
- */
- hs_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
- hs_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
- hs_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
-
- ss_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
- ss_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
- ss_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
-
- status = usb_assign_descriptors(f, eth_fs_function, eth_hs_function,
- eth_ss_function);
- if (status)
- goto fail;
-
- rndis->port.open = rndis_open;
- rndis->port.close = rndis_close;
-
- rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
- rndis_set_host_mac(rndis->config, rndis->ethaddr);
-
- if (rndis->manufacturer && rndis->vendorID &&
- rndis_set_param_vendor(rndis->config, rndis->vendorID,
- rndis->manufacturer))
- goto fail;
-
- /* NOTE: all that is done without knowing or caring about
- * the network link ... which is unavailable to this code
- * until we're activated via set_alt().
- */
-
- DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n",
- gadget_is_superspeed(c->cdev->gadget) ? "super" :
- gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
- rndis->port.in_ep->name, rndis->port.out_ep->name,
- rndis->notify->name);
- return 0;
-
-fail:
- kfree(f->os_desc_table);
- f->os_desc_n = 0;
- usb_free_all_descriptors(f);
-
- if (rndis->notify_req) {
- kfree(rndis->notify_req->buf);
- usb_ep_free_request(rndis->notify, rndis->notify_req);
- }
-
- /* we might as well release our claims on endpoints */
- if (rndis->notify)
- rndis->notify->driver_data = NULL;
- if (rndis->port.out_ep)
- rndis->port.out_ep->driver_data = NULL;
- if (rndis->port.in_ep)
- rndis->port.in_ep->driver_data = NULL;
-
- ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
-
- return status;
-}
-
-void rndis_borrow_net(struct usb_function_instance *f, struct net_device *net)
-{
- struct f_rndis_opts *opts;
-
- opts = container_of(f, struct f_rndis_opts, func_inst);
- if (opts->bound)
- gether_cleanup(netdev_priv(opts->net));
- else
- free_netdev(opts->net);
- opts->borrowed_net = opts->bound = true;
- opts->net = net;
-}
-EXPORT_SYMBOL_GPL(rndis_borrow_net);
-
-static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item)
-{
- return container_of(to_config_group(item), struct f_rndis_opts,
- func_inst.group);
-}
-
-/* f_rndis_item_ops */
-USB_ETHERNET_CONFIGFS_ITEM(rndis);
-
-/* f_rndis_opts_dev_addr */
-USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(rndis);
-
-/* f_rndis_opts_host_addr */
-USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(rndis);
-
-/* f_rndis_opts_qmult */
-USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(rndis);
-
-/* f_rndis_opts_ifname */
-USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(rndis);
-
-static struct configfs_attribute *rndis_attrs[] = {
- &f_rndis_opts_dev_addr.attr,
- &f_rndis_opts_host_addr.attr,
- &f_rndis_opts_qmult.attr,
- &f_rndis_opts_ifname.attr,
- NULL,
-};
-
-static struct config_item_type rndis_func_type = {
- .ct_item_ops = &rndis_item_ops,
- .ct_attrs = rndis_attrs,
- .ct_owner = THIS_MODULE,
-};
-
-static void rndis_free_inst(struct usb_function_instance *f)
-{
- struct f_rndis_opts *opts;
-
- opts = container_of(f, struct f_rndis_opts, func_inst);
- if (!opts->borrowed_net) {
- if (opts->bound)
- gether_cleanup(netdev_priv(opts->net));
- else
- free_netdev(opts->net);
- }
-
- kfree(opts->rndis_os_desc.group.default_groups); /* single VLA chunk */
- kfree(opts);
-}
-
-static struct usb_function_instance *rndis_alloc_inst(void)
-{
- struct f_rndis_opts *opts;
- struct usb_os_desc *descs[1];
-
- opts = kzalloc(sizeof(*opts), GFP_KERNEL);
- if (!opts)
- return ERR_PTR(-ENOMEM);
- opts->rndis_os_desc.ext_compat_id = opts->rndis_ext_compat_id;
-
- mutex_init(&opts->lock);
- opts->func_inst.free_func_inst = rndis_free_inst;
- opts->net = gether_setup_default();
- if (IS_ERR(opts->net)) {
- struct net_device *net = opts->net;
- kfree(opts);
- return ERR_CAST(net);
- }
- INIT_LIST_HEAD(&opts->rndis_os_desc.ext_prop);
-
- descs[0] = &opts->rndis_os_desc;
- usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs,
- THIS_MODULE);
- config_group_init_type_name(&opts->func_inst.group, "",
- &rndis_func_type);
-
- return &opts->func_inst;
-}
-
-static void rndis_free(struct usb_function *f)
-{
- struct f_rndis *rndis;
- struct f_rndis_opts *opts;
-
- rndis = func_to_rndis(f);
- rndis_deregister(rndis->config);
- opts = container_of(f->fi, struct f_rndis_opts, func_inst);
- kfree(rndis);
- mutex_lock(&opts->lock);
- opts->refcnt--;
- mutex_unlock(&opts->lock);
-}
-
-static void rndis_unbind(struct usb_configuration *c, struct usb_function *f)
-{
- struct f_rndis *rndis = func_to_rndis(f);
-
- kfree(f->os_desc_table);
- f->os_desc_n = 0;
- usb_free_all_descriptors(f);
-
- kfree(rndis->notify_req->buf);
- usb_ep_free_request(rndis->notify, rndis->notify_req);
-}
-
-static struct usb_function *rndis_alloc(struct usb_function_instance *fi)
-{
- struct f_rndis *rndis;
- struct f_rndis_opts *opts;
- int status;
-
- /* allocate and initialize one new instance */
- rndis = kzalloc(sizeof(*rndis), GFP_KERNEL);
- if (!rndis)
- return ERR_PTR(-ENOMEM);
-
- opts = container_of(fi, struct f_rndis_opts, func_inst);
- mutex_lock(&opts->lock);
- opts->refcnt++;
-
- gether_get_host_addr_u8(opts->net, rndis->ethaddr);
- rndis->vendorID = opts->vendor_id;
- rndis->manufacturer = opts->manufacturer;
-
- rndis->port.ioport = netdev_priv(opts->net);
- mutex_unlock(&opts->lock);
- /* RNDIS activates when the host changes this filter */
- rndis->port.cdc_filter = 0;
-
- /* RNDIS has special (and complex) framing */
- rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
- rndis->port.wrap = rndis_add_header;
- rndis->port.unwrap = rndis_rm_hdr;
-
- rndis->port.func.name = "rndis";
- /* descriptors are per-instance copies */
- rndis->port.func.bind = rndis_bind;
- rndis->port.func.unbind = rndis_unbind;
- rndis->port.func.set_alt = rndis_set_alt;
- rndis->port.func.setup = rndis_setup;
- rndis->port.func.disable = rndis_disable;
- rndis->port.func.free_func = rndis_free;
-
- status = rndis_register(rndis_response_available, rndis);
- if (status < 0) {
- kfree(rndis);
- return ERR_PTR(status);
- }
- rndis->config = status;
-
- return &rndis->port.func;
-}
-
-DECLARE_USB_FUNCTION(rndis, rndis_alloc_inst, rndis_alloc);
-
-static int __init rndis_mod_init(void)
-{
- int ret;
-
- ret = rndis_init();
- if (ret)
- return ret;
-
- return usb_function_register(&rndisusb_func);
-}
-module_init(rndis_mod_init);
-
-static void __exit rndis_mod_exit(void)
-{
- usb_function_unregister(&rndisusb_func);
- rndis_exit();
-}
-module_exit(rndis_mod_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("David Brownell");
projects / firefly-linux-kernel-4.4.55.git / blobdiff