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net/ipv4/sysfs_net_ipv4.c
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/*
* net/ipv4/sysfs_net_ipv4.c
*
* sysfs-based networking knobs (so we can, unlike with sysctl, control perms)
*
* Copyright (C) 2008 Google, Inc.
*
* Robert Love <rlove@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/init.h>
#include <net/tcp.h>
#define CREATE_IPV4_FILE(_name, _var) \
static ssize_t _name##_show(struct kobject *kobj, \
struct kobj_attribute *attr, char *buf) \
{ \
return sprintf(buf, "%d
", _var); \
} \
static ssize_t _name##_store(struct kobject *kobj, \
struct kobj_attribute *attr, \
const char *buf, size_t count) \
{ \
int val, ret; \
ret = sscanf(buf, "%d", &val); \
if (ret != 1) \
return -EINVAL; \
if (val < 0) \
return -EINVAL; \
_var = val; \
return count; \
} \
static struct kobj_attribute _name##_attr = \
__ATTR(_name, 0644, _name##_show, _name##_store)
CREATE_IPV4_FILE(tcp_wmem_min, sysctl_tcp_wmem[0]);
CREATE_IPV4_FILE(tcp_wmem_def, sysctl_tcp_wmem[1]);
CREATE_IPV4_FILE(tcp_wmem_max, sysctl_tcp_wmem[2]);
CREATE_IPV4_FILE(tcp_rmem_min, sysctl_tcp_rmem[0]);
CREATE_IPV4_FILE(tcp_rmem_def, sysctl_tcp_rmem[1]);
CREATE_IPV4_FILE(tcp_rmem_max, sysctl_tcp_rmem[2]);
static struct attribute *ipv4_attrs[] = {
&tcp_wmem_min_attr.attr,
&tcp_wmem_def_attr.attr,
&tcp_wmem_max_attr.attr,
&tcp_rmem_min_attr.attr,
&tcp_rmem_def_attr.attr,
&tcp_rmem_max_attr.attr,
NULL
};
static struct attribute_group ipv4_attr_group = {
.attrs = ipv4_attrs,
};
static __init int sysfs_ipv4_init(void)
{
struct kobject *ipv4_kobject;
int ret;
ipv4_kobject = kobject_create_and_add("ipv4", kernel_kobj);
if (!ipv4_kobject)
return -ENOMEM;
ret = sysfs_create_group(ipv4_kobject, &ipv4_attr_group);
if (ret) {
kobject_put(ipv4_kobject);
return ret;
}
return 0;
}
subsys_initcall(sysfs_ipv4_init);
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