path: root/drivers/net/bonding/bond_sysfs.c

/*
 * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/sysfs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <linux/rtnetlink.h>

/* #define BONDING_DEBUG 1 */
#include "bonding.h"
#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
#define to_net_dev(class) container_of(class, struct net_device, class_dev)
#define to_bond(cd)	((struct bonding *)(to_net_dev(cd)->priv))

/*---------------------------- Declarations -------------------------------*/


extern struct list_head bond_dev_list;
extern struct bond_params bonding_defaults;
extern struct bond_parm_tbl bond_mode_tbl[];
extern struct bond_parm_tbl bond_lacp_tbl[];
extern struct bond_parm_tbl xmit_hashtype_tbl[];

static int expected_refcount = -1;
static struct class *netdev_class;
/*--------------------------- Data Structures -----------------------------*/

/* Bonding sysfs lock.  Why can't we just use the subsytem lock?
 * Because kobject_register tries to acquire the subsystem lock.  If
 * we already hold the lock (which we would if the user was creating
 * a new bond through the sysfs interface), we deadlock.
 * This lock is only needed when deleting a bond - we need to make sure
 * that we don't collide with an ongoing ioctl.
 */

struct rw_semaphore bonding_rwsem;




/*------------------------------ Functions --------------------------------*/

/*
 * "show" function for the bond_masters attribute.
 * The class parameter is ignored.
 */
static ssize_t bonding_show_bonds(struct class *cls, char *buffer)
{
	int res = 0;
	struct bonding *bond;

	down_read(&(bonding_rwsem));

	list_for_each_entry(bond, &bond_dev_list, bond_list) {
		if (res > (PAGE_SIZE - IFNAMSIZ)) {
			/* not enough space for another interface name */
			if ((PAGE_SIZE - res) > 10)
				res = PAGE_SIZE - 10;
			res += sprintf(buffer + res, "++more++");
			break;
		}
		res += sprintf(buffer + res, "%s ",
			       bond->dev->name);
	}
	res += sprintf(buffer + res, "\n");
	res++;
	up_read(&(bonding_rwsem));
	return res;
}

/*
 * "store" function for the bond_masters attribute.  This is what
 * creates and deletes entire bonds.
 *
 * The class parameter is ignored.
 *
 */

static ssize_t bonding_store_bonds(struct class *cls, const char *buffer, size_t count)
{
	char command[IFNAMSIZ + 1] = {0, };
	char *ifname;
	int res = count;
	struct bonding *bond;
	struct bonding *nxt;

	down_write(&(bonding_rwsem));
	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
	ifname = command + 1;
	if ((strlen(command) <= 1) ||
	    !dev_valid_name(ifname))
		goto err_no_cmd;

	if (command[0] == '+') {

		/* Check to see if the bond already exists. */
		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
				printk(KERN_ERR DRV_NAME
					": cannot add bond %s; it already exists\n",
					ifname);
				res = -EPERM;
				goto out;
			}

		printk(KERN_INFO DRV_NAME
			": %s is being created...\n", ifname);
		if (bond_create(ifname, &bonding_defaults, &bond)) {
			printk(KERN_INFO DRV_NAME
			": %s interface already exists. Bond creation failed.\n",
			ifname);
			res = -EPERM;
		}
		goto out;
	}

	if (command[0] == '-') {
		list_for_each_entry_safe(bond, nxt, &bond_dev_list, bond_list)
			if (strnicmp(bond->dev->name, ifname, IFNAMSIZ) == 0) {
				rtnl_lock();
				/* check the ref count on the bond's kobject