1 /* 2 * linux/fs/proc/net.c 3 * 4 * Copyright (C) 2007 5 * 6 * Author: Eric Biederman <ebiederm@xmission.com> 7 * 8 * proc net directory handling functions 9 */ 10 11 #include <asm/uaccess.h> 12 13 #include <linux/errno.h> 14 #include <linux/time.h> 15 #include <linux/proc_fs.h> 16 #include <linux/stat.h> 17 #include <linux/init.h> 18 #include <linux/sched.h> 19 #include <linux/module.h> 20 #include <linux/bitops.h> 21 #include <linux/smp_lock.h> 22 #include <linux/mount.h> 23 #include <linux/nsproxy.h> 24 #include <net/net_namespace.h> 25 26 #include "internal.h" 27 28 29 struct proc_dir_entry *proc_net_fops_create(struct net *net, 30 const char *name, mode_t mode, const struct file_operations *fops) 31 { 32 struct proc_dir_entry *res; 33 34 res = create_proc_entry(name, mode, net->proc_net); 35 if (res) 36 res->proc_fops = fops; 37 return res; 38 } 39 EXPORT_SYMBOL_GPL(proc_net_fops_create); 40 41 void proc_net_remove(struct net *net, const char *name) 42 { 43 remove_proc_entry(name, net->proc_net); 44 } 45 EXPORT_SYMBOL_GPL(proc_net_remove); 46 47 struct net *get_proc_net(const struct inode *inode) 48 { 49 return maybe_get_net(PDE_NET(PDE(inode))); 50 } 51 EXPORT_SYMBOL_GPL(get_proc_net); 52 53 static struct proc_dir_entry *shadow_pde; 54 55 static struct proc_dir_entry *proc_net_shadow(struct task_struct *task, 56 struct proc_dir_entry *de) 57 { 58 return task->nsproxy->net_ns->proc_net; 59 } 60 61 static __net_init int proc_net_ns_init(struct net *net) 62 { 63 struct proc_dir_entry *root, *netd, *net_statd; 64 int err; 65 66 err = -ENOMEM; 67 root = kzalloc(sizeof(*root), GFP_KERNEL); 68 if (!root) 69 goto out; 70 71 err = -EEXIST; 72 netd = proc_mkdir("net", root); 73 if (!netd) 74 goto free_root; 75 76 err = -EEXIST; 77 net_statd = proc_mkdir("stat", netd); 78 if (!net_statd) 79 goto free_net; 80 81 root->data = net; 82 netd->data = net; 83 net_statd->data = net; 84 85 net->proc_net_root = root; 86 net->proc_net = netd; 87 net->proc_net_stat = net_statd; 88 err = 0; 89 90 out: 91 return err; 92 free_net: 93 remove_proc_entry("net", root); 94 free_root: 95 kfree(root); 96 goto out; 97 } 98 99 static __net_exit void proc_net_ns_exit(struct net *net) 100 { 101 remove_proc_entry("stat", net->proc_net); 102 remove_proc_entry("net", net->proc_net_root); 103 kfree(net->proc_net_root); 104 } 105 106 static struct pernet_operations __net_initdata proc_net_ns_ops = { 107 .init = proc_net_ns_init, 108 .exit = proc_net_ns_exit, 109 }; 110 111 int __init proc_net_init(void) 112 { 113 shadow_pde = proc_mkdir("net", NULL); 114 shadow_pde->shadow_proc = proc_net_shadow; 115 116 return register_pernet_subsys(&proc_net_ns_ops); 117 } 118