op-state-get.c

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/*
 * Linux WiMAX
 * Implement and export a method for getting a WiMAX device current state
 *
 * Copyright (C) 2009 Paulius Zaleckas <[email protected]>
 *
 * Based on previous WiMAX core work by:
 *  Copyright (C) 2008 Intel Corporation <[email protected]>
 *  Inaky Perez-Gonzalez <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <net/wimax.h>
#include <net/genetlink.h>
#include <linux/wimax.h>
#include <linux/security.h>
#include "wimax-internal.h"

#define D_SUBMODULE op_state_get
#include "debug-levels.h"


static const struct nla_policy wimax_gnl_state_get_policy[WIMAX_GNL_ATTR_MAX + 1] = {
    [WIMAX_GNL_STGET_IFIDX] = {
        .type = NLA_U32,
    },
};


/*
 * Exporting to user space over generic netlink
 *
 * Parse the state get command from user space, return a combination
 * value that describe the current state.
 *
 * No attributes.
 */
static
int wimax_gnl_doit_state_get(struct sk_buff *skb, struct genl_info *info)
{
    int result, ifindex;
    struct wimax_dev *wimax_dev;

    d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
    result = -ENODEV;
    if (info->attrs[WIMAX_GNL_STGET_IFIDX] == NULL) {
        printk(KERN_ERR "WIMAX_GNL_OP_STATE_GET: can't find IFIDX "
            "attribute\n");
        goto error_no_wimax_dev;
    }
    ifindex = nla_get_u32(info->attrs[WIMAX_GNL_STGET_IFIDX]);
    wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
    if (wimax_dev == NULL)
        goto error_no_wimax_dev;
    /* Execute the operation and send the result back to user space */
    result = wimax_state_get(wimax_dev);
    dev_put(wimax_dev->net_dev);
error_no_wimax_dev:
    d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
    return result;
}


struct genl_ops wimax_gnl_state_get = {
    .cmd = WIMAX_GNL_OP_STATE_GET,
    .flags = GENL_ADMIN_PERM,
    .policy = wimax_gnl_state_get_policy,
    .doit = wimax_gnl_doit_state_get,
    .dumpit = NULL,
};