| Robert Love | 41b377f | 2008-07-31 11:12:44 -0400 | [diff] [blame] | 1 | /* |
| 2 | * net/ipv4/sysfs_net_ipv4.c |
| 3 | * |
| 4 | * sysfs-based networking knobs (so we can, unlike with sysctl, control perms) |
| 5 | * |
| 6 | * Copyright (C) 2008 Google, Inc. |
| 7 | * |
| 8 | * Robert Love <rlove@google.com> |
| 9 | * |
| 10 | * This software is licensed under the terms of the GNU General Public |
| 11 | * License version 2, as published by the Free Software Foundation, and |
| 12 | * may be copied, distributed, and modified under those terms. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kobject.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/sysfs.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <net/tcp.h> |
| 25 | |
| 26 | #define CREATE_IPV4_FILE(_name, _var) \ |
| 27 | static ssize_t _name##_show(struct kobject *kobj, \ |
| 28 | struct kobj_attribute *attr, char *buf) \ |
| 29 | { \ |
| 30 | return sprintf(buf, "%d\n", _var); \ |
| 31 | } \ |
| 32 | static ssize_t _name##_store(struct kobject *kobj, \ |
| 33 | struct kobj_attribute *attr, \ |
| 34 | const char *buf, size_t count) \ |
| 35 | { \ |
| 36 | int val, ret; \ |
| 37 | ret = sscanf(buf, "%d", &val); \ |
| 38 | if (ret != 1) \ |
| 39 | return -EINVAL; \ |
| 40 | if (val < 0) \ |
| 41 | return -EINVAL; \ |
| 42 | _var = val; \ |
| 43 | return count; \ |
| 44 | } \ |
| 45 | static struct kobj_attribute _name##_attr = \ |
| 46 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 47 | |
| 48 | CREATE_IPV4_FILE(tcp_wmem_min, sysctl_tcp_wmem[0]); |
| 49 | CREATE_IPV4_FILE(tcp_wmem_def, sysctl_tcp_wmem[1]); |
| 50 | CREATE_IPV4_FILE(tcp_wmem_max, sysctl_tcp_wmem[2]); |
| 51 | |
| 52 | CREATE_IPV4_FILE(tcp_rmem_min, sysctl_tcp_rmem[0]); |
| 53 | CREATE_IPV4_FILE(tcp_rmem_def, sysctl_tcp_rmem[1]); |
| 54 | CREATE_IPV4_FILE(tcp_rmem_max, sysctl_tcp_rmem[2]); |
| 55 | |
| 56 | static struct attribute *ipv4_attrs[] = { |
| 57 | &tcp_wmem_min_attr.attr, |
| 58 | &tcp_wmem_def_attr.attr, |
| 59 | &tcp_wmem_max_attr.attr, |
| 60 | &tcp_rmem_min_attr.attr, |
| 61 | &tcp_rmem_def_attr.attr, |
| 62 | &tcp_rmem_max_attr.attr, |
| 63 | NULL |
| 64 | }; |
| 65 | |
| 66 | static struct attribute_group ipv4_attr_group = { |
| 67 | .attrs = ipv4_attrs, |
| 68 | }; |
| 69 | |
| 70 | static __init int sysfs_ipv4_init(void) |
| 71 | { |
| 72 | struct kobject *ipv4_kobject; |
| 73 | int ret; |
| 74 | |
| 75 | ipv4_kobject = kobject_create_and_add("ipv4", kernel_kobj); |
| 76 | if (!ipv4_kobject) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | ret = sysfs_create_group(ipv4_kobject, &ipv4_attr_group); |
| 80 | if (ret) { |
| 81 | kobject_put(ipv4_kobject); |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | subsys_initcall(sysfs_ipv4_init); |