rndis.c

omap3 linux 2.6 用nocc去除了冗余代码

			 __FUNCTION__, OID, buf_len);
	}

	return retval;
}

/*
 * Response Functions
 */

static int rndis_init_response (int configNr, rndis_init_msg_type *buf)
{
	rndis_init_cmplt_type	*resp;
	rndis_resp_t            *r;

	if (!rndis_per_dev_params [configNr].dev) return -ENOTSUPP;

	r = rndis_add_response (configNr, sizeof (rndis_init_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_init_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32 (
			REMOTE_NDIS_INITIALIZE_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32 (52);
	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
	resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_SUCCESS);
	resp->MajorVersion = __constant_cpu_to_le32 (RNDIS_MAJOR_VERSION);
	resp->MinorVersion = __constant_cpu_to_le32 (RNDIS_MINOR_VERSION);
	resp->DeviceFlags = __constant_cpu_to_le32 (RNDIS_DF_CONNECTIONLESS);
	resp->Medium = __constant_cpu_to_le32 (RNDIS_MEDIUM_802_3);
	resp->MaxPacketsPerTransfer = __constant_cpu_to_le32 (1);
	resp->MaxTransferSize = cpu_to_le32 (
		  rndis_per_dev_params [configNr].dev->mtu
		+ sizeof (struct ethhdr)
		+ sizeof (struct rndis_packet_msg_type)
		+ 22);
	resp->PacketAlignmentFactor = __constant_cpu_to_le32 (0);
	resp->AFListOffset = __constant_cpu_to_le32 (0);
	resp->AFListSize = __constant_cpu_to_le32 (0);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);

	return 0;
}

static int rndis_query_response (int configNr, rndis_query_msg_type *buf)
{
	rndis_query_cmplt_type *resp;
	rndis_resp_t            *r;

	// DEBUG("%s: OID = %08X\n", __FUNCTION__, cpu_to_le32(buf->OID));
	if (!rndis_per_dev_params [configNr].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 (configNr,
		sizeof (oid_supported_list) + sizeof(rndis_query_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_query_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32 (REMOTE_NDIS_QUERY_CMPLT);
	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */

	if (gen_ndis_query_resp (configNr, le32_to_cpu (buf->OID),
			le32_to_cpu(buf->InformationBufferOffset)
					+ 8 + (u8 *) buf,
			le32_to_cpu(buf->InformationBufferLength),
			r)) {
		/* OID not supported */
		resp->Status = __constant_cpu_to_le32 (
				RNDIS_STATUS_NOT_SUPPORTED);
		resp->MessageLength = __constant_cpu_to_le32 (sizeof *resp);
		resp->InformationBufferLength = __constant_cpu_to_le32 (0);
		resp->InformationBufferOffset = __constant_cpu_to_le32 (0);
	} else
		resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);
	return 0;
}

static int rndis_set_response (int configNr, rndis_set_msg_type *buf)
{
	u32			BufLength, BufOffset;
	rndis_set_cmplt_type	*resp;
	rndis_resp_t		*r;

	r = rndis_add_response (configNr, sizeof (rndis_set_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_set_cmplt_type *) r->buf;

	BufLength = le32_to_cpu (buf->InformationBufferLength);
	BufOffset = le32_to_cpu (buf->InformationBufferOffset);


	resp->MessageType = __constant_cpu_to_le32 (REMOTE_NDIS_SET_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32 (16);
	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
	if (gen_ndis_set_resp (configNr, le32_to_cpu (buf->OID),
			((u8 *) buf) + 8 + BufOffset, BufLength, r))
		resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_NOT_SUPPORTED);
	else
		resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);

	return 0;
}

static int rndis_reset_response (int configNr, rndis_reset_msg_type *buf)
{
	rndis_reset_cmplt_type	*resp;
	rndis_resp_t		*r;

	r = rndis_add_response (configNr, sizeof (rndis_reset_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_reset_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32 (REMOTE_NDIS_RESET_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32 (16);
	resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_SUCCESS);
	/* resent information */
	resp->AddressingReset = __constant_cpu_to_le32 (1);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);

	return 0;
}

static int rndis_keepalive_response (int configNr,
				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 (configNr, sizeof (rndis_keepalive_cmplt_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_keepalive_cmplt_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32 (
			REMOTE_NDIS_KEEPALIVE_CMPLT);
	resp->MessageLength = __constant_cpu_to_le32 (16);
	resp->RequestID = buf->RequestID; /* Still LE in msg buffer */
	resp->Status = __constant_cpu_to_le32 (RNDIS_STATUS_SUCCESS);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);

	return 0;
}


/*
 * Device to Host Comunication
 */
static int rndis_indicate_status_msg (int configNr, u32 status)
{
	rndis_indicate_status_msg_type	*resp;
	rndis_resp_t			*r;

	if (rndis_per_dev_params [configNr].state == RNDIS_UNINITIALIZED)
		return -ENOTSUPP;

	r = rndis_add_response (configNr,
				sizeof (rndis_indicate_status_msg_type));
	if (!r)
		return -ENOMEM;
	resp = (rndis_indicate_status_msg_type *) r->buf;

	resp->MessageType = __constant_cpu_to_le32 (
			REMOTE_NDIS_INDICATE_STATUS_MSG);
	resp->MessageLength = __constant_cpu_to_le32 (20);
	resp->Status = cpu_to_le32 (status);
	resp->StatusBufferLength = __constant_cpu_to_le32 (0);
	resp->StatusBufferOffset = __constant_cpu_to_le32 (0);

	if (rndis_per_dev_params [configNr].ack)
		rndis_per_dev_params [configNr].ack (
			rndis_per_dev_params [configNr].dev);
	return 0;
}

int rndis_signal_connect (int configNr)
{
	rndis_per_dev_params [configNr].media_state
			= NDIS_MEDIA_STATE_CONNECTED;
	return rndis_indicate_status_msg (configNr,
					  RNDIS_STATUS_MEDIA_CONNECT);
}

int rndis_signal_disconnect (int configNr)
{
	rndis_per_dev_params [configNr].media_state
			= NDIS_MEDIA_STATE_DISCONNECTED;
	return rndis_indicate_status_msg (configNr,
					  RNDIS_STATUS_MEDIA_DISCONNECT);
}

void rndis_uninit (int configNr)
{
	u8 *buf;
	u32 length;

	if (configNr >= RNDIS_MAX_CONFIGS)
		return;
	rndis_per_dev_params [configNr].used = 0;
	rndis_per_dev_params [configNr].state = RNDIS_UNINITIALIZED;

	/* drain the response queue */
	while ((buf = rndis_get_next_response(configNr, &length)))
		rndis_free_response(configNr, buf);
}

void rndis_set_host_mac (int configNr, const u8 *addr)
{
	rndis_per_dev_params [configNr].host_mac = addr;
}

/*
 * Message Parser
 */
int rndis_msg_parser (u8 configNr, u8 *buf)
{
	u32 MsgType, MsgLength;
	__le32 *tmp;
	struct rndis_params		*params;

	if (!buf)
		return -ENOMEM;

	tmp = (__le32 *) buf;
	MsgType   = le32_to_cpu(get_unaligned(tmp++));
	MsgLength = le32_to_cpu(get_unaligned(tmp++));

	if (configNr >= RNDIS_MAX_CONFIGS)
		return -ENOTSUPP;
	params = &rndis_per_dev_params [configNr];

	/* 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 REMOTE_NDIS_INITIALIZE_MSG:
		DEBUG("%s: REMOTE_NDIS_INITIALIZE_MSG\n",
			__FUNCTION__ );
		params->state = RNDIS_INITIALIZED;
		return  rndis_init_response (configNr,
					(rndis_init_msg_type *) buf);

	case REMOTE_NDIS_HALT_MSG:
		DEBUG("%s: REMOTE_NDIS_HALT_MSG\n",
			__FUNCTION__ );
		params->state = RNDIS_UNINITIALIZED;
		if (params->dev) {
			netif_carrier_off (params->dev);
			netif_stop_queue (params->dev);
		}
		return 0;

	case REMOTE_NDIS_QUERY_MSG:
		return rndis_query_response (configNr,
					(rndis_query_msg_type *) buf);

	case REMOTE_NDIS_SET_MSG:
		return rndis_set_response (configNr,
					(rndis_set_msg_type *) buf);

	case REMOTE_NDIS_RESET_MSG:
		DEBUG("%s: REMOTE_NDIS_RESET_MSG\n",
			__FUNCTION__ );
		return rndis_reset_response (configNr,
					(rndis_reset_msg_type *) buf);

	case REMOTE_NDIS_KEEPALIVE_MSG:
		/* For USB: host does this every 5 seconds */
		if (rndis_debug > 1)
			DEBUG("%s: REMOTE_NDIS_KEEPALIVE_MSG\n",
				__FUNCTION__ );
		return rndis_keepalive_response (configNr,
						 (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.
		 */
		printk (KERN_WARNING
			"%s: unknown RNDIS message 0x%08X len %d\n",
			__FUNCTION__ , MsgType, MsgLength);
		{
			unsigned i;
			for (i = 0; i < MsgLength; i += 16) {
				DEBUG ("%03d: "
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					" %02x %02x %02x %02x"
					"\n",
					i,
					buf[i], buf [i+1],
						buf[i+2], buf[i+3],
					buf[i+4], buf [i+5],
						buf[i+6], buf[i+7],
					buf[i+8], buf [i+9],
						buf[i+10], buf[i+11],
					buf[i+12], buf [i+13],
						buf[i+14], buf[i+15]);
			}
		}
		break;
	}

	return -ENOTSUPP;
}

int rndis_register (int (* rndis_control_ack) (struct net_device *))
{
	u8 i;

	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
		if (!rndis_per_dev_params [i].used) {
			rndis_per_dev_params [i].used = 1;
			rndis_per_dev_params [i].ack = rndis_control_ack;
			DEBUG("%s: configNr = %d\n", __FUNCTION__, i);
			return i;
		}
	}
	DEBUG("failed\n");

	return -1;
}

void rndis_deregister (int configNr)
{
	DEBUG("%s: \n", __FUNCTION__ );

	if (configNr >= RNDIS_MAX_CONFIGS) return;
	rndis_per_dev_params [configNr].used = 0;

	return;
}

int rndis_set_param_dev (u8 configNr, struct net_device *dev,
			 struct net_device_stats *stats,
			 u16 *cdc_filter)
{
	DEBUG("%s:\n", __FUNCTION__ );
	if (!dev || !stats) return -1;
	if (configNr >= RNDIS_MAX_CONFIGS) return -1;

	rndis_per_dev_params [configNr].dev = dev;
	rndis_per_dev_params [configNr].stats = stats;
	rndis_per_dev_params [configNr].filter = cdc_filter;

	return 0;
}

int rndis_set_param_vendor (u8 configNr, u32 vendorID, const char *vendorDescr)
{
	DEBUG("%s:\n", __FUNCTION__ );
	if (!vendorDescr) return -1;
	if (configNr >= RNDIS_MAX_CONFIGS) return -1;

	rndis_per_dev_params [configNr].vendorID = vendorID;
	rndis_per_dev_params [configNr].vendorDescr = vendorDescr;

	return 0;
}

int rndis_set_param_medium (u8 configNr, u32 medium, u32 speed)
{
	DEBUG("%s: %u %u\n", __FUNCTION__, medium, speed);
	if (configNr >= RNDIS_MAX_CONFIGS) return -1;

	rndis_per_dev_params [configNr].medium = medium;
	rndis_per_dev_params [configNr].speed = speed;

	return 0;
}

void rndis_add_hdr (struct sk_buff *skb)
{
	struct rndis_packet_msg_type	*header;

	if (!skb)
		return;
	header = (void *) skb_push (skb, sizeof *header);
	memset (header, 0, sizeof *header);
	header->MessageType = __constant_cpu_to_le32(REMOTE_NDIS_PACKET_MSG);
	header->MessageLength = cpu_to_le32(skb->len);
	header->DataOffset = __constant_cpu_to_le32 (36);
	header->DataLength = cpu_to_le32(skb->len - sizeof *header);
}

void rndis_free_response (int configNr, u8 *buf)
{
	rndis_resp_t		*r;
	struct list_head	*act, *tmp;

	list_for_each_safe (act, tmp,
			&(rndis_per_dev_params [configNr].resp_queue))
	{
		r = list_entry (act, rndis_resp_t, list);
		if (r && r->buf == buf) {
			list_del (&r->list);
			kfree (r);
		}
	}
}

u8 *rndis_get_next_response (int configNr, u32 *length)
{
	rndis_resp_t		*r;
	struct list_head	*act, *tmp;

	if (!length) return NULL;

	list_for_each_safe (act, tmp,
			&(rndis_per_dev_params [configNr].resp_queue))
	{
		r = list_entry (act, rndis_resp_t, list);
		if (!r->send) {
			r->send = 1;
			*length = r->length;
			return r->buf;
		}
	}

	return NULL;
}

static rndis_resp_t *rndis_add_response (int configNr, 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;

	list_add_tail (&r->list,
		&(rndis_per_dev_params [configNr].resp_queue));
	return r;
}

int rndis_rm_hdr(struct sk_buff *skb)
{
	/* tmp points to a struct rndis_packet_msg_type */
	__le32		*tmp = (void *) skb->data;

	/* MessageType, MessageLength */
	if (__constant_cpu_to_le32(REMOTE_NDIS_PACKET_MSG)
			!= get_unaligned(tmp++))
		return -EINVAL;
	tmp++;

	/* DataOffset, DataLength */
	if (!skb_pull(skb, le32_to_cpu(get_unaligned(tmp++))
			+ 8 /* offset of DataOffset */))
		return -EOVERFLOW;
	skb_trim(skb, le32_to_cpu(get_unaligned(tmp++)));

	return 0;
}



int __devinit rndis_init (void)
{
	u8 i;

	for (i = 0; i < RNDIS_MAX_CONFIGS; i++) {
		rndis_per_dev_params [i].confignr = i;
		rndis_per_dev_params [i].used = 0;
		rndis_per_dev_params [i].state = RNDIS_UNINITIALIZED;
		rndis_per_dev_params [i].media_state
				= NDIS_MEDIA_STATE_DISCONNECTED;
		INIT_LIST_HEAD (&(rndis_per_dev_params [i].resp_queue));
	}

	return 0;
}

void rndis_exit (void)
{
}