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linux-zen-desktop/drivers/usb/gadget/function/rndis.c

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// SPDX-License-Identifier: GPL-2.0
/*
* RNDIS MSG parser
*
* Authors: Benedikt Spranger, Pengutronix
* Robert Schwebel, Pengutronix
*
* This software was originally developed in conformance with
* Microsoft's Remote NDIS Specification License Agreement.
*
* 03/12/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
* Fixed message length bug in init_response
*
* 03/25/2004 Kai-Uwe Bloem <linux-development@auerswald.de>
* Fixed rndis_rm_hdr length bug.
*
* Copyright (C) 2004 by David Brownell
* updates to merge with Linux 2.6, better match RNDIS spec
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/idr.h>
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/netdevice.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#include "u_rndis.h"
#undef VERBOSE_DEBUG
#include "rndis.h"
/* The driver for your USB chip needs to support ep0 OUT to work with
* RNDIS, plus all three CDC Ethernet endpoints (interrupt not optional).
*
* Windows hosts need an INF file like Documentation/usb/linux.inf
* and will be happier if you provide the host_addr module parameter.
*/
#if 0
static int rndis_debug = 0;
module_param (rndis_debug, int, 0);
MODULE_PARM_DESC (rndis_debug, "enable debugging");
#else
#define rndis_debug 0
#endif
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
#define NAME_TEMPLATE "driver/rndis-%03d"
#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
static DEFINE_IDA(rndis_ida);
/* Driver Version */
static const __le32 rndis_driver_version = cpu_to_le32(1);
/* Function Prototypes */
static rndis_resp_t *rndis_add_response(struct rndis_params *params,
u32 length);
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
static const struct proc_ops rndis_proc_ops;
#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
/* supported OIDs */
static const u32 oid_supported_list[] = {
/* the general stuff */
RNDIS_OID_GEN_SUPPORTED_LIST,
RNDIS_OID_GEN_HARDWARE_STATUS,
RNDIS_OID_GEN_MEDIA_SUPPORTED,
RNDIS_OID_GEN_MEDIA_IN_USE,
RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
RNDIS_OID_GEN_LINK_SPEED,
RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE,
RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE,
RNDIS_OID_GEN_VENDOR_ID,
RNDIS_OID_GEN_VENDOR_DESCRIPTION,
RNDIS_OID_GEN_VENDOR_DRIVER_VERSION,
RNDIS_OID_GEN_CURRENT_PACKET_FILTER,
RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE,
RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
RNDIS_OID_GEN_PHYSICAL_MEDIUM,
/* the statistical stuff */
RNDIS_OID_GEN_XMIT_OK,
RNDIS_OID_GEN_RCV_OK,
RNDIS_OID_GEN_XMIT_ERROR,
RNDIS_OID_GEN_RCV_ERROR,
RNDIS_OID_GEN_RCV_NO_BUFFER,
#ifdef RNDIS_OPTIONAL_STATS
RNDIS_OID_GEN_DIRECTED_BYTES_XMIT,
RNDIS_OID_GEN_DIRECTED_FRAMES_XMIT,
RNDIS_OID_GEN_MULTICAST_BYTES_XMIT,
RNDIS_OID_GEN_MULTICAST_FRAMES_XMIT,
RNDIS_OID_GEN_BROADCAST_BYTES_XMIT,
RNDIS_OID_GEN_BROADCAST_FRAMES_XMIT,
RNDIS_OID_GEN_DIRECTED_BYTES_RCV,
RNDIS_OID_GEN_DIRECTED_FRAMES_RCV,
RNDIS_OID_GEN_MULTICAST_BYTES_RCV,
RNDIS_OID_GEN_MULTICAST_FRAMES_RCV,
RNDIS_OID_GEN_BROADCAST_BYTES_RCV,
RNDIS_OID_GEN_BROADCAST_FRAMES_RCV,
RNDIS_OID_GEN_RCV_CRC_ERROR,
RNDIS_OID_GEN_TRANSMIT_QUEUE_LENGTH,
#endif /* RNDIS_OPTIONAL_STATS */
/* mandatory 802.3 */
/* the general stuff */
RNDIS_OID_802_3_PERMANENT_ADDRESS,
RNDIS_OID_802_3_CURRENT_ADDRESS,
RNDIS_OID_802_3_MULTICAST_LIST,
RNDIS_OID_802_3_MAC_OPTIONS,
RNDIS_OID_802_3_MAXIMUM_LIST_SIZE,
/* the statistical stuff */
RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT,
RNDIS_OID_802_3_XMIT_ONE_COLLISION,
RNDIS_OID_802_3_XMIT_MORE_COLLISIONS,
#ifdef RNDIS_OPTIONAL_STATS
RNDIS_OID_802_3_XMIT_DEFERRED,
RNDIS_OID_802_3_XMIT_MAX_COLLISIONS,
RNDIS_OID_802_3_RCV_OVERRUN,
RNDIS_OID_802_3_XMIT_UNDERRUN,
RNDIS_OID_802_3_XMIT_HEARTBEAT_FAILURE,
RNDIS_OID_802_3_XMIT_TIMES_CRS_LOST,
RNDIS_OID_802_3_XMIT_LATE_COLLISIONS,
#endif /* RNDIS_OPTIONAL_STATS */
#ifdef RNDIS_PM
/* PM and wakeup are "mandatory" for USB, but the RNDIS specs
* don't say what they mean ... and the NDIS specs are often
* confusing and/or ambiguous in this context. (That is, more
* so than their specs for the other OIDs.)
*
* FIXME someone who knows what these should do, please
* implement them!
*/
/* power management */
OID_PNP_CAPABILITIES,
OID_PNP_QUERY_POWER,
OID_PNP_SET_POWER,
#ifdef RNDIS_WAKEUP
/* wake up host */
OID_PNP_ENABLE_WAKE_UP,
OID_PNP_ADD_WAKE_UP_PATTERN,
OID_PNP_REMOVE_WAKE_UP_PATTERN,
#endif /* RNDIS_WAKEUP */
#endif /* RNDIS_PM */
};
/* NDIS Functions */
static int gen_ndis_query_resp(struct rndis_params *params, u32 OID, u8 *buf,
unsigned buf_len, rndis_resp_t *r)
{
int retval = -ENOTSUPP;
u32 length = 4; /* usually */
__le32 *outbuf;
int i, count;
rndis_query_cmplt_type *resp;
struct net_device *net;
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats;
if (!r) return -ENOMEM;
resp = (rndis_query_cmplt_type *)r->buf;
if (!resp) return -ENOMEM;
if (buf_len && rndis_debug > 1) {
pr_debug("query OID %08x value, len %d:\n", OID, buf_len);
for (i = 0; i < buf_len; i += 16) {
pr_debug("%03d: %08x %08x %08x %08x\n", i,
get_unaligned_le32(&buf[i]),
get_unaligned_le32(&buf[i + 4]),
get_unaligned_le32(&buf[i + 8]),
get_unaligned_le32(&buf[i + 12]));
}
}
/* response goes here, right after the header */
outbuf = (__le32 *)&resp[1];
resp->InformationBufferOffset = cpu_to_le32(16);
net = params->dev;
stats = dev_get_stats(net, &temp);
switch (OID) {
/* general oids (table 4-1) */
/* mandatory */
case RNDIS_OID_GEN_SUPPORTED_LIST:
pr_debug("%s: RNDIS_OID_GEN_SUPPORTED_LIST\n", __func__);
length = sizeof(oid_supported_list);
count = length / sizeof(u32);
for (i = 0; i < count; i++)
outbuf[i] = cpu_to_le32(oid_supported_list[i]);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_HARDWARE_STATUS:
pr_debug("%s: RNDIS_OID_GEN_HARDWARE_STATUS\n", __func__);
/* Bogus question!
* Hardware must be ready to receive high level protocols.
* BTW:
* reddite ergo quae sunt Caesaris Caesari
* et quae sunt Dei Deo!
*/
*outbuf = cpu_to_le32(0);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_MEDIA_SUPPORTED:
pr_debug("%s: RNDIS_OID_GEN_MEDIA_SUPPORTED\n", __func__);
*outbuf = cpu_to_le32(params->medium);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_MEDIA_IN_USE:
pr_debug("%s: RNDIS_OID_GEN_MEDIA_IN_USE\n", __func__);
/* one medium, one transport... (maybe you do it better) */
*outbuf = cpu_to_le32(params->medium);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE:
pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE\n", __func__);
if (params->dev) {
*outbuf = cpu_to_le32(params->dev->mtu);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_LINK_SPEED:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_LINK_SPEED\n", __func__);
if (params->media_state == RNDIS_MEDIA_STATE_DISCONNECTED)
*outbuf = cpu_to_le32(0);
else
*outbuf = cpu_to_le32(params->speed);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE:
pr_debug("%s: RNDIS_OID_GEN_TRANSMIT_BLOCK_SIZE\n", __func__);
if (params->dev) {
*outbuf = cpu_to_le32(params->dev->mtu);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE:
pr_debug("%s: RNDIS_OID_GEN_RECEIVE_BLOCK_SIZE\n", __func__);
if (params->dev) {
*outbuf = cpu_to_le32(params->dev->mtu);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_VENDOR_ID:
pr_debug("%s: RNDIS_OID_GEN_VENDOR_ID\n", __func__);
*outbuf = cpu_to_le32(params->vendorID);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_VENDOR_DESCRIPTION:
pr_debug("%s: RNDIS_OID_GEN_VENDOR_DESCRIPTION\n", __func__);
if (params->vendorDescr) {
length = strlen(params->vendorDescr);
memcpy(outbuf, params->vendorDescr, length);
} else {
outbuf[0] = 0;
}
retval = 0;
break;
case RNDIS_OID_GEN_VENDOR_DRIVER_VERSION:
pr_debug("%s: RNDIS_OID_GEN_VENDOR_DRIVER_VERSION\n", __func__);
/* Created as LE */
*outbuf = rndis_driver_version;
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_CURRENT_PACKET_FILTER:
pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER\n", __func__);
*outbuf = cpu_to_le32(*params->filter);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE:
pr_debug("%s: RNDIS_OID_GEN_MAXIMUM_TOTAL_SIZE\n", __func__);
*outbuf = cpu_to_le32(RNDIS_MAX_TOTAL_SIZE);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_GEN_MEDIA_CONNECT_STATUS:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_MEDIA_CONNECT_STATUS\n", __func__);
*outbuf = cpu_to_le32(params->media_state);
retval = 0;
break;
case RNDIS_OID_GEN_PHYSICAL_MEDIUM:
pr_debug("%s: RNDIS_OID_GEN_PHYSICAL_MEDIUM\n", __func__);
*outbuf = cpu_to_le32(0);
retval = 0;
break;
/* The RNDIS specification is incomplete/wrong. Some versions
* of MS-Windows expect OIDs that aren't specified there. Other
* versions emit undefined RNDIS messages. DOCUMENT ALL THESE!
*/
case RNDIS_OID_GEN_MAC_OPTIONS: /* from WinME */
pr_debug("%s: RNDIS_OID_GEN_MAC_OPTIONS\n", __func__);
*outbuf = cpu_to_le32(
RNDIS_MAC_OPTION_RECEIVE_SERIALIZED
| RNDIS_MAC_OPTION_FULL_DUPLEX);
retval = 0;
break;
/* statistics OIDs (table 4-2) */
/* mandatory */
case RNDIS_OID_GEN_XMIT_OK:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_XMIT_OK\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->tx_packets
- stats->tx_errors - stats->tx_dropped);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_RCV_OK:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_RCV_OK\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->rx_packets
- stats->rx_errors - stats->rx_dropped);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_XMIT_ERROR:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_XMIT_ERROR\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->tx_errors);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_RCV_ERROR:
if (rndis_debug > 1)
pr_debug("%s: RNDIS_OID_GEN_RCV_ERROR\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->rx_errors);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_GEN_RCV_NO_BUFFER:
pr_debug("%s: RNDIS_OID_GEN_RCV_NO_BUFFER\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->rx_dropped);
retval = 0;
}
break;
/* ieee802.3 OIDs (table 4-3) */
/* mandatory */
case RNDIS_OID_802_3_PERMANENT_ADDRESS:
pr_debug("%s: RNDIS_OID_802_3_PERMANENT_ADDRESS\n", __func__);
if (params->dev) {
length = ETH_ALEN;
memcpy(outbuf, params->host_mac, length);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_802_3_CURRENT_ADDRESS:
pr_debug("%s: RNDIS_OID_802_3_CURRENT_ADDRESS\n", __func__);
if (params->dev) {
length = ETH_ALEN;
memcpy(outbuf, params->host_mac, length);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_802_3_MULTICAST_LIST:
pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__);
/* Multicast base address only */
*outbuf = cpu_to_le32(0xE0000000);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_802_3_MAXIMUM_LIST_SIZE:
pr_debug("%s: RNDIS_OID_802_3_MAXIMUM_LIST_SIZE\n", __func__);
/* Multicast base address only */
*outbuf = cpu_to_le32(1);
retval = 0;
break;
case RNDIS_OID_802_3_MAC_OPTIONS:
pr_debug("%s: RNDIS_OID_802_3_MAC_OPTIONS\n", __func__);
*outbuf = cpu_to_le32(0);
retval = 0;
break;
/* ieee802.3 statistics OIDs (table 4-4) */
/* mandatory */
case RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT:
pr_debug("%s: RNDIS_OID_802_3_RCV_ERROR_ALIGNMENT\n", __func__);
if (stats) {
*outbuf = cpu_to_le32(stats->rx_frame_errors);
retval = 0;
}
break;
/* mandatory */
case RNDIS_OID_802_3_XMIT_ONE_COLLISION:
pr_debug("%s: RNDIS_OID_802_3_XMIT_ONE_COLLISION\n", __func__);
*outbuf = cpu_to_le32(0);
retval = 0;
break;
/* mandatory */
case RNDIS_OID_802_3_XMIT_MORE_COLLISIONS:
pr_debug("%s: RNDIS_OID_802_3_XMIT_MORE_COLLISIONS\n", __func__);
*outbuf = cpu_to_le32(0);
retval = 0;
break;
default:
pr_warn("%s: query unknown OID 0x%08X\n", __func__, OID);
}
if (retval < 0)
length = 0;
resp->InformationBufferLength = cpu_to_le32(length);
r->length = length + sizeof(*resp);
resp->MessageLength = cpu_to_le32(r->length);
return retval;
}
static int gen_ndis_set_resp(struct rndis_params *params, u32 OID,
u8 *buf, u32 buf_len, rndis_resp_t *r)
{
rndis_set_cmplt_type *resp;
int i, retval = -ENOTSUPP;
if (!r)
return -ENOMEM;
resp = (rndis_set_cmplt_type *)r->buf;
if (!resp)
return -ENOMEM;
if (buf_len && rndis_debug > 1) {
pr_debug("set OID %08x value, len %d:\n", OID, buf_len);
for (i = 0; i < buf_len; i += 16) {
pr_debug("%03d: %08x %08x %08x %08x\n", i,
get_unaligned_le32(&buf[i]),
get_unaligned_le32(&buf[i + 4]),
get_unaligned_le32(&buf[i + 8]),
get_unaligned_le32(&buf[i + 12]));
}
}
switch (OID) {
case RNDIS_OID_GEN_CURRENT_PACKET_FILTER:
/* these NDIS_PACKET_TYPE_* bitflags are shared with
* cdc_filter; it's not RNDIS-specific
* NDIS_PACKET_TYPE_x == USB_CDC_PACKET_TYPE_x for x in:
* PROMISCUOUS, DIRECTED,
* MULTICAST, ALL_MULTICAST, BROADCAST
*/
*params->filter = (u16)get_unaligned_le32(buf);
pr_debug("%s: RNDIS_OID_GEN_CURRENT_PACKET_FILTER %08x\n",
__func__, *params->filter);
/* this call has a significant side effect: it's
* what makes the packet flow start and stop, like
* activating the CDC Ethernet altsetting.
*/
retval = 0;
if (*params->filter) {
params->state = RNDIS_DATA_INITIALIZED;
netif_carrier_on(params->dev);
if (netif_running(params->dev))
netif_wake_queue(params->dev);
} else {
params->state = RNDIS_INITIALIZED;
netif_carrier_off(params->dev);
netif_stop_queue(params->dev);
}
break;
case RNDIS_OID_802_3_MULTICAST_LIST:
/* I think we can ignore this */
pr_debug("%s: RNDIS_OID_802_3_MULTICAST_LIST\n", __func__);
retval = 0;
break;
default:
pr_warn("%s: set unknown OID 0x%08X, size %d\n",
__func__, OID, buf_len);
}
return retval;
}
/*
* Response Functions
*/
static int rndis_init_response(struct rndis_params *params,
rndis_init_msg_type *buf)
{
rndis_init_cmplt_type *resp;
rndis_resp_t *r;
if (!params->dev)
return -ENOTSUPP;
r = rndis_add_response(params, sizeof(rndis_init_cmplt_type));
if (!r)
return -ENOMEM;
resp = (rndis_init_cmplt_type *)r->buf;
resp->MessageType = cpu_to_le32(RNDIS_MSG_INIT_C);
resp->MessageLength = cpu_to_le32(52);
resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
resp->MajorVersion = cpu_to_le32(RNDIS_MAJOR_VERSION);
resp->MinorVersion = cpu_to_le32(RNDIS_MINOR_VERSION);
resp->DeviceFlags = cpu_to_le32(RNDIS_DF_CONNECTIONLESS);
resp->Medium = cpu_to_le32(RNDIS_MEDIUM_802_3);
resp->MaxPacketsPerTransfer = cpu_to_le32(1);
resp->MaxTransferSize = cpu_to_le32(
params->dev->mtu
+ sizeof(struct ethhdr)
+ sizeof(struct rndis_packet_msg_type)
+ 22);
resp->PacketAlignmentFactor = cpu_to_le32(0);
resp->AFListOffset = cpu_to_le32(0);
resp->AFListSize = cpu_to_le32(0);
params->resp_avail(params->v);
return 0;
}
static int rndis_query_response(struct rndis_params *params,
rndis_query_msg_type *buf)
{
rndis_query_cmplt_type *resp;
rndis_resp_t *r;
/* pr_debug("%s: OID = %08X\n", __func__, cpu_to_le32(buf->OID)); */
if (!params->dev)
return -ENOTSUPP;
/*
* we need more memory:
* gen_ndis_query_resp expects enough space for
* rndis_query_cmplt_type followed by data.
* oid_supported_list is the largest data reply
*/
r = rndis_add_response(params,
sizeof(oid_supported_list) + sizeof(rndis_query_cmplt_type));
if (!r)
return -ENOMEM;
resp = (rndis_query_cmplt_type *)r->buf;
resp->MessageType = cpu_to_le32(RNDIS_MSG_QUERY_C);
resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
if (gen_ndis_query_resp(params, le32_to_cpu(buf->OID),
le32_to_cpu(buf->InformationBufferOffset)
+ 8 + (u8 *)buf,
le32_to_cpu(buf->InformationBufferLength),
r)) {
/* OID not supported */
resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
resp->MessageLength = cpu_to_le32(sizeof *resp);
resp->InformationBufferLength = cpu_to_le32(0);
resp->InformationBufferOffset = cpu_to_le32(0);
} else
resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
params->resp_avail(params->v);
return 0;
}
static int rndis_set_response(struct rndis_params *params,
rndis_set_msg_type *buf)
{
u32 BufLength, BufOffset;
rndis_set_cmplt_type *resp;
rndis_resp_t *r;
BufLength = le32_to_cpu(buf->InformationBufferLength);
BufOffset = le32_to_cpu(buf->InformationBufferOffset);
if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||
(BufOffset > RNDIS_MAX_TOTAL_SIZE) ||
(BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))
return -EINVAL;
r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
if (!r)
return -ENOMEM;
resp = (rndis_set_cmplt_type *)r->buf;
#ifdef VERBOSE_DEBUG
pr_debug("%s: Length: %d\n", __func__, BufLength);
pr_debug("%s: Offset: %d\n", __func__, BufOffset);
pr_debug("%s: InfoBuffer: ", __func__);
for (i = 0; i < BufLength; i++) {
pr_debug("%02x ", *(((u8 *) buf) + i + 8 + BufOffset));
}
pr_debug("\n");
#endif
resp->MessageType = cpu_to_le32(RNDIS_MSG_SET_C);
resp->MessageLength = cpu_to_le32(16);
resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
if (gen_ndis_set_resp(params, le32_to_cpu(buf->OID),
((u8 *)buf) + 8 + BufOffset, BufLength, r))
resp->Status = cpu_to_le32(RNDIS_STATUS_NOT_SUPPORTED);
else
resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
params->resp_avail(params->v);
return 0;
}
static int rndis_reset_response(struct rndis_params *params,
rndis_reset_msg_type *buf)
{
rndis_reset_cmplt_type *resp;
rndis_resp_t *r;
u8 *xbuf;
u32 length;
/* drain the response queue */
while ((xbuf = rndis_get_next_response(params, &length)))
rndis_free_response(params, xbuf);
r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
if (!r)
return -ENOMEM;
resp = (rndis_reset_cmplt_type *)r->buf;
resp->MessageType = cpu_to_le32(RNDIS_MSG_RESET_C);
resp->MessageLength = cpu_to_le32(16);
resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
/* resent information */
resp->AddressingReset = cpu_to_le32(1);
params->resp_avail(params->v);
return 0;
}
static int rndis_keepalive_response(struct rndis_params *params,
rndis_keepalive_msg_type *buf)
{
rndis_keepalive_cmplt_type *resp;
rndis_resp_t *r;
/* host "should" check only in RNDIS_DATA_INITIALIZED state */
r = rndis_add_response(params, sizeof(rndis_keepalive_cmplt_type));
if (!r)
return -ENOMEM;
resp = (rndis_keepalive_cmplt_type *)r->buf;
resp->MessageType = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
resp->MessageLength = cpu_to_le32(16);
resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
resp->Status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
params->resp_avail(params->v);
return 0;
}
/*
* Device to Host Comunication
*/
static int rndis_indicate_status_msg(struct rndis_params *params, u32 status)
{
rndis_indicate_status_msg_type *resp;
rndis_resp_t *r;
if (params->state == RNDIS_UNINITIALIZED)
return -ENOTSUPP;
r = rndis_add_response(params, sizeof(rndis_indicate_status_msg_type));
if (!r)
return -ENOMEM;
resp = (rndis_indicate_status_msg_type *)r->buf;
resp->MessageType = cpu_to_le32(RNDIS_MSG_INDICATE);
resp->MessageLength = cpu_to_le32(20);
resp->Status = cpu_to_le32(status);
resp->StatusBufferLength = cpu_to_le32(0);
resp->StatusBufferOffset = cpu_to_le32(0);
params->resp_avail(params->v);
return 0;
}
int rndis_signal_connect(struct rndis_params *params)
{
params->media_state = RNDIS_MEDIA_STATE_CONNECTED;
return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_CONNECT);
}
EXPORT_SYMBOL_GPL(rndis_signal_connect);
int rndis_signal_disconnect(struct rndis_params *params)
{
params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
return rndis_indicate_status_msg(params, RNDIS_STATUS_MEDIA_DISCONNECT);
}
EXPORT_SYMBOL_GPL(rndis_signal_disconnect);
void rndis_uninit(struct rndis_params *params)
{
u8 *buf;
u32 length;
if (!params)
return;
params->state = RNDIS_UNINITIALIZED;
/* drain the response queue */
while ((buf = rndis_get_next_response(params, &length)))
rndis_free_response(params, buf);
}
EXPORT_SYMBOL_GPL(rndis_uninit);
void rndis_set_host_mac(struct rndis_params *params, const u8 *addr)
{
params->host_mac = addr;
}
EXPORT_SYMBOL_GPL(rndis_set_host_mac);
/*
* Message Parser
*/
int rndis_msg_parser(struct rndis_params *params, u8 *buf)
{
u32 MsgType, MsgLength;
__le32 *tmp;
if (!buf)
return -ENOMEM;
tmp = (__le32 *)buf;
MsgType = get_unaligned_le32(tmp++);
MsgLength = get_unaligned_le32(tmp++);
if (!params)
return -ENOTSUPP;
/* NOTE: RNDIS is *EXTREMELY* chatty ... Windows constantly polls for
* rx/tx statistics and link status, in addition to KEEPALIVE traffic
* and normal HC level polling to see if there's any IN traffic.
*/
/* For USB: responses may take up to 10 seconds */
switch (MsgType) {
case RNDIS_MSG_INIT:
pr_debug("%s: RNDIS_MSG_INIT\n",
__func__);
params->state = RNDIS_INITIALIZED;
return rndis_init_response(params, (rndis_init_msg_type *)buf);
case RNDIS_MSG_HALT:
pr_debug("%s: RNDIS_MSG_HALT\n",
__func__);
params->state = RNDIS_UNINITIALIZED;
if (params->dev) {
netif_carrier_off(params->dev);
netif_stop_queue(params->dev);
}
return 0;
case RNDIS_MSG_QUERY:
return rndis_query_response(params,
(rndis_query_msg_type *)buf);
case RNDIS_MSG_SET:
return rndis_set_response(params, (rndis_set_msg_type *)buf);
case RNDIS_MSG_RESET:
pr_debug("%s: RNDIS_MSG_RESET\n",
__func__);
return rndis_reset_response(params,
(rndis_reset_msg_type *)buf);
case RNDIS_MSG_KEEPALIVE:
/* For USB: host does this every 5 seconds */
if (rndis_debug > 1)
pr_debug("%s: RNDIS_MSG_KEEPALIVE\n",
__func__);
return rndis_keepalive_response(params,
(rndis_keepalive_msg_type *)
buf);
default:
/* At least Windows XP emits some undefined RNDIS messages.
* In one case those messages seemed to relate to the host
* suspending itself.
*/
pr_warn("%s: unknown RNDIS message 0x%08X len %d\n",
__func__, MsgType, MsgLength);
/* Garbled message can be huge, so limit what we display */
if (MsgLength > 16)
MsgLength = 16;
print_hex_dump_bytes(__func__, DUMP_PREFIX_OFFSET,
buf, MsgLength);
break;
}
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(rndis_msg_parser);
static inline int rndis_get_nr(void)
{
return ida_simple_get(&rndis_ida, 0, 1000, GFP_KERNEL);
}
static inline void rndis_put_nr(int nr)
{
ida_simple_remove(&rndis_ida, nr);
}
struct rndis_params *rndis_register(void (*resp_avail)(void *v), void *v)
{
struct rndis_params *params;
int i;
if (!resp_avail)
return ERR_PTR(-EINVAL);
i = rndis_get_nr();
if (i < 0) {
pr_debug("failed\n");
return ERR_PTR(-ENODEV);
}
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params) {
rndis_put_nr(i);
return ERR_PTR(-ENOMEM);
}
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
{
struct proc_dir_entry *proc_entry;
char name[20];
sprintf(name, NAME_TEMPLATE, i);
proc_entry = proc_create_data(name, 0660, NULL,
&rndis_proc_ops, params);
if (!proc_entry) {
kfree(params);
rndis_put_nr(i);
return ERR_PTR(-EIO);
}
}
#endif
params->confignr = i;
params->used = 1;
params->state = RNDIS_UNINITIALIZED;
params->media_state = RNDIS_MEDIA_STATE_DISCONNECTED;
params->resp_avail = resp_avail;
params->v = v;
INIT_LIST_HEAD(&params->resp_queue);
spin_lock_init(&params->resp_lock);
pr_debug("%s: configNr = %d\n", __func__, i);
return params;
}
EXPORT_SYMBOL_GPL(rndis_register);
void rndis_deregister(struct rndis_params *params)
{
int i;
pr_debug("%s:\n", __func__);
if (!params)
return;
i = params->confignr;
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
{
char name[20];
sprintf(name, NAME_TEMPLATE, i);
remove_proc_entry(name, NULL);
}
#endif
kfree(params);
rndis_put_nr(i);
}
EXPORT_SYMBOL_GPL(rndis_deregister);
int rndis_set_param_dev(struct rndis_params *params, struct net_device *dev,
u16 *cdc_filter)
{
pr_debug("%s:\n", __func__);
if (!dev)
return -EINVAL;
if (!params)
return -1;
params->dev = dev;
params->filter = cdc_filter;
return 0;
}
EXPORT_SYMBOL_GPL(rndis_set_param_dev);
int rndis_set_param_vendor(struct rndis_params *params, u32 vendorID,
const char *vendorDescr)
{
pr_debug("%s:\n", __func__);
if (!vendorDescr) return -1;
if (!params)
return -1;
params->vendorID = vendorID;
params->vendorDescr = vendorDescr;
return 0;
}
EXPORT_SYMBOL_GPL(rndis_set_param_vendor);
int rndis_set_param_medium(struct rndis_params *params, u32 medium, u32 speed)
{
pr_debug("%s: %u %u\n", __func__, medium, speed);
if (!params)
return -1;
params->medium = medium;
params->speed = speed;
return 0;
}
EXPORT_SYMBOL_GPL(rndis_set_param_medium);
void rndis_add_hdr(struct sk_buff *skb)
{
struct rndis_packet_msg_type *header;
if (!skb)
return;
header = skb_push(skb, sizeof(*header));
memset(header, 0, sizeof *header);
header->MessageType = cpu_to_le32(RNDIS_MSG_PACKET);
header->MessageLength = cpu_to_le32(skb->len);
header->DataOffset = cpu_to_le32(36);
header->DataLength = cpu_to_le32(skb->len - sizeof(*header));
}
EXPORT_SYMBOL_GPL(rndis_add_hdr);
void rndis_free_response(struct rndis_params *params, u8 *buf)
{
rndis_resp_t *r, *n;
spin_lock(&params->resp_lock);
list_for_each_entry_safe(r, n, &params->resp_queue, list) {
if (r->buf == buf) {
list_del(&r->list);
kfree(r);
}
}
spin_unlock(&params->resp_lock);
}
EXPORT_SYMBOL_GPL(rndis_free_response);
u8 *rndis_get_next_response(struct rndis_params *params, u32 *length)
{
rndis_resp_t *r, *n;
if (!length) return NULL;
spin_lock(&params->resp_lock);
list_for_each_entry_safe(r, n, &params->resp_queue, list) {
if (!r->send) {
r->send = 1;
*length = r->length;
spin_unlock(&params->resp_lock);
return r->buf;
}
}
spin_unlock(&params->resp_lock);
return NULL;
}
EXPORT_SYMBOL_GPL(rndis_get_next_response);
static rndis_resp_t *rndis_add_response(struct rndis_params *params, u32 length)
{
rndis_resp_t *r;
/* NOTE: this gets copied into ether.c USB_BUFSIZ bytes ... */
r = kmalloc(sizeof(rndis_resp_t) + length, GFP_ATOMIC);
if (!r) return NULL;
r->buf = (u8 *)(r + 1);
r->length = length;
r->send = 0;
spin_lock(&params->resp_lock);
list_add_tail(&r->list, &params->resp_queue);
spin_unlock(&params->resp_lock);
return r;
}
int rndis_rm_hdr(struct gether *port,
struct sk_buff *skb,
struct sk_buff_head *list)
{
/* tmp points to a struct rndis_packet_msg_type */
__le32 *tmp = (void *)skb->data;
/* MessageType, MessageLength */
if (cpu_to_le32(RNDIS_MSG_PACKET)
!= get_unaligned(tmp++)) {
dev_kfree_skb_any(skb);
return -EINVAL;
}
tmp++;
/* DataOffset, DataLength */
if (!skb_pull(skb, get_unaligned_le32(tmp++) + 8)) {
dev_kfree_skb_any(skb);
return -EOVERFLOW;
}
skb_trim(skb, get_unaligned_le32(tmp++));
skb_queue_tail(list, skb);
return 0;
}
EXPORT_SYMBOL_GPL(rndis_rm_hdr);
#ifdef CONFIG_USB_GADGET_DEBUG_FILES
static int rndis_proc_show(struct seq_file *m, void *v)
{
rndis_params *param = m->private;
seq_printf(m,
"Config Nr. %d\n"
"used : %s\n"
"state : %s\n"
"medium : 0x%08X\n"
"speed : %u\n"
"cable : %s\n"
"vendor ID : 0x%08X\n"
"vendor : %s\n",
param->confignr, (param->used) ? "y" : "n",
({ char *s = "?";
switch (param->state) {
case RNDIS_UNINITIALIZED:
s = "RNDIS_UNINITIALIZED"; break;
case RNDIS_INITIALIZED:
s = "RNDIS_INITIALIZED"; break;
case RNDIS_DATA_INITIALIZED:
s = "RNDIS_DATA_INITIALIZED"; break;
} s; }),
param->medium,
(param->media_state) ? 0 : param->speed*100,
(param->media_state) ? "disconnected" : "connected",
param->vendorID, param->vendorDescr);
return 0;
}
static ssize_t rndis_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
rndis_params *p = pde_data(file_inode(file));
u32 speed = 0;
int i, fl_speed = 0;
for (i = 0; i < count; i++) {
char c;
if (get_user(c, buffer))
return -EFAULT;
switch (c) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
fl_speed = 1;
speed = speed * 10 + c - '0';
break;
case 'C':
case 'c':
rndis_signal_connect(p);
break;
case 'D':
case 'd':
rndis_signal_disconnect(p);
break;
default:
if (fl_speed) p->speed = speed;
else pr_debug("%c is not valid\n", c);
break;
}
buffer++;
}
return count;
}
static int rndis_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, rndis_proc_show, pde_data(inode));
}
static const struct proc_ops rndis_proc_ops = {
.proc_open = rndis_proc_open,
.proc_read = seq_read,
.proc_lseek = seq_lseek,
.proc_release = single_release,
.proc_write = rndis_proc_write,
};
#define NAME_TEMPLATE "driver/rndis-%03d"
#endif /* CONFIG_USB_GADGET_DEBUG_FILES */
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