path: root/drivers/net/hyperv/rndis_filter.c

/*
 * Copyright (c) 2009, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *   Haiyang Zhang <haiyangz@microsoft.com>
 *   Hank Janssen  <hjanssen@microsoft.com>
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/nls.h>

#include "hyperv_net.h"


#define RNDIS_EXT_LEN PAGE_SIZE
struct rndis_request {
	struct list_head list_ent;
	struct completion  wait_event;

	struct rndis_message response_msg;
	/*
	 * The buffer for extended info after the RNDIS response message. It's
	 * referenced based on the data offset in the RNDIS message. Its size
	 * is enough for current needs, and should be sufficient for the near
	 * future.
	 */
	u8 response_ext[RNDIS_EXT_LEN];

	/* Simplify allocation by having a netvsc packet inline */
	struct hv_netvsc_packet	pkt;
	/* Set 2 pages for rndis requests crossing page boundary */
	struct hv_page_buffer buf[2];

	struct rndis_message request_msg;
	/*
	 * The buffer for the extended info after the RNDIS request message.
	 * It is referenced and sized in a similar way as response_ext.
	 */
	u8 request_ext[RNDIS_EXT_LEN];
};

static struct rndis_device *get_rndis_device(void)
{
	struct rndis_device *device;

	device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
	if (!device)
		return NULL;

	spin_lock_init(&device->request_lock);

	INIT_LIST_HEAD(&device->req_list);

	device->state = RNDIS_DEV_UNINITIALIZED;

	return device;
}

static struct rndis_request *get_rndis_request(struct rndis_device *dev,
					     u32 msg_type,
					     u32 msg_len)
{
	struct rndis_request *request;
	struct rndis_message *rndis_msg;
	struct rndis_set_request *set;
	unsigned long flags;

	request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
	if (!request)
		return NULL;

	init_completion(&request->wait_event);

	rndis_msg = &request->request_msg;
	rndis_msg->ndis_msg_type = msg_type;
	rndis_msg->msg_len = msg_len;

	request->pkt.q_idx = 0;

	/*
	 * Set the request id. This field is always after the rndis header for
	 * request/response packet types so we just used the SetRequest as a
	 * template
	 */
	set = &rndis_msg->msg.set_req;
	set->req_id = atomic_inc_return(&dev->new_req_id);

	/* Add to the request list */
	spin_lock_irqsave(&dev->request_lock, flags);
	list_add_tail(&request->list_ent, &dev->req_list);
	spin_unlock_irqrestore(&dev->request_lock, flags);

	return request;
}

static void put_rndis_request(struct rndis_device *dev,
			    struct rndis_request *req)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->request_lock, flags);
	list_del(&req->list_ent);
	spin_unlock_irqrestore(&dev->request_lock, flags);

	kfree(req);
}

static void dump_rndis_message(struct hv_device *hv_dev,
			struct rndis_message *rndis_msg)
{
	struct net_device *netdev;
	struct netvsc_device *net_device;

	net_device = hv_get_drvdata(hv_dev);
	netdev = net_device->ndev;

	switch (rndis_msg->ndis_msg_type) {
	case RNDIS_MSG_PACKET:
		netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "