LXR linux/fs/proc/proc

   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
  29struct 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}
  39EXPORT_SYMBOL_GPL(proc_net_fops_create);
  40
  41void proc_net_remove(struct net *net, const char *name)
  42{
  43        remove_proc_entry(name, net->proc_net);
  44}
  45EXPORT_SYMBOL_GPL(proc_net_remove);
  46
  47struct net *get_proc_net(const struct inode *inode)
  48{
  49        return maybe_get_net(PDE_NET(PDE(inode)));
  50}
  51EXPORT_SYMBOL_GPL(get_proc_net);
  52
  53static struct proc_dir_entry *shadow_pde;
  54
  55static 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
  61static __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
  90out:
  91        return err;
  92free_net:
  93        remove_proc_entry("net", root);
  94free_root:
  95        kfree(root);
  96        goto out;
  97}
  98
  99static __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
 106static struct pernet_operations __net_initdata proc_net_ns_ops = {
 107        .init = proc_net_ns_init,
 108        .exit = proc_net_ns_exit,
 109};
 110
 111int __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