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88 lines
2.3 KiB
88 lines
2.3 KiB
/* |
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* net/ipv4/sysfs_net_ipv4.c |
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* |
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* sysfs-based networking knobs (so we can, unlike with sysctl, control perms) |
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* |
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* Copyright (C) 2008 Google, Inc. |
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* |
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* Robert Love <rlove@google.com> |
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* |
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* This software is licensed under the terms of the GNU General Public |
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* License version 2, as published by the Free Software Foundation, and |
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* may be copied, distributed, and modified under those terms. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <linux/kobject.h> |
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#include <linux/string.h> |
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#include <linux/sysfs.h> |
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#include <linux/init.h> |
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#include <net/tcp.h> |
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#define CREATE_IPV4_FILE(_name, _var) \ |
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static ssize_t _name##_show(struct kobject *kobj, \ |
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struct kobj_attribute *attr, char *buf) \ |
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{ \ |
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return sprintf(buf, "%d\n", _var); \ |
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} \ |
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static ssize_t _name##_store(struct kobject *kobj, \ |
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struct kobj_attribute *attr, \ |
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const char *buf, size_t count) \ |
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{ \ |
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int val, ret; \ |
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ret = sscanf(buf, "%d", &val); \ |
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if (ret != 1) \ |
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return -EINVAL; \ |
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if (val < 0) \ |
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return -EINVAL; \ |
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_var = val; \ |
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return count; \ |
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} \ |
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static struct kobj_attribute _name##_attr = \ |
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__ATTR(_name, 0644, _name##_show, _name##_store) |
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CREATE_IPV4_FILE(tcp_wmem_min, sysctl_tcp_wmem[0]); |
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CREATE_IPV4_FILE(tcp_wmem_def, sysctl_tcp_wmem[1]); |
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CREATE_IPV4_FILE(tcp_wmem_max, sysctl_tcp_wmem[2]); |
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CREATE_IPV4_FILE(tcp_rmem_min, sysctl_tcp_rmem[0]); |
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CREATE_IPV4_FILE(tcp_rmem_def, sysctl_tcp_rmem[1]); |
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CREATE_IPV4_FILE(tcp_rmem_max, sysctl_tcp_rmem[2]); |
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static struct attribute *ipv4_attrs[] = { |
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&tcp_wmem_min_attr.attr, |
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&tcp_wmem_def_attr.attr, |
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&tcp_wmem_max_attr.attr, |
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&tcp_rmem_min_attr.attr, |
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&tcp_rmem_def_attr.attr, |
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&tcp_rmem_max_attr.attr, |
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NULL |
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}; |
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static struct attribute_group ipv4_attr_group = { |
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.attrs = ipv4_attrs, |
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}; |
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static __init int sysfs_ipv4_init(void) |
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{ |
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struct kobject *ipv4_kobject; |
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int ret; |
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ipv4_kobject = kobject_create_and_add("ipv4", kernel_kobj); |
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if (!ipv4_kobject) |
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return -ENOMEM; |
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ret = sysfs_create_group(ipv4_kobject, &ipv4_attr_group); |
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if (ret) { |
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kobject_put(ipv4_kobject); |
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return ret; |
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} |
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return 0; |
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} |
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subsys_initcall(sysfs_ipv4_init);
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