fs/proc/proc_net.c

   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 #include <linux/seq_file.h>
  26
  27 #include "internal.h"
  28
  29
  30 int seq_open_net(struct inode *ino, struct file *f,
  31                  const struct seq_operations *ops, int size)
  32 {
  33         struct net *net;
  34         struct seq_net_private *p;
  35
  36         BUG_ON(size < sizeof(*p));
  37
  38         net = get_proc_net(ino);
  39         if (net == NULL)
  40                 return -ENXIO;
  41
  42         p = __seq_open_private(f, ops, size);
  43         if (p == NULL) {
  44                 put_net(net);
  45                 return -ENOMEM;
  46         }
  47         p->net = net;
  48         return 0;
  49 }
  50 EXPORT_SYMBOL_GPL(seq_open_net);
  51
  52 int seq_release_net(struct inode *ino, struct file *f)
  53 {
  54         struct seq_file *seq;
  55         struct seq_net_private *p;
  56
  57         seq = f->private_data;
  58         p = seq->private;
  59
  60         put_net(p->net);
  61         seq_release_private(ino, f);
  62         return 0;
  63 }
  64 EXPORT_SYMBOL_GPL(seq_release_net);
  65
  66 <<<<<<< HEAD:fs/proc/proc_net.c
  67 =======
  68 static struct net *get_proc_task_net(struct inode *dir)
  69 {
  70         struct task_struct *task;
  71         struct nsproxy *ns;
  72         struct net *net = NULL;
  73
  74         rcu_read_lock();
  75         task = pid_task(proc_pid(dir), PIDTYPE_PID);
  76         if (task != NULL) {
  77                 ns = task_nsproxy(task);
  78                 if (ns != NULL)
  79                         net = get_net(ns->net_ns);
  80         }
  81         rcu_read_unlock();
  82
  83         return net;
  84 }
  85
  86 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
  87                 struct dentry *dentry, struct nameidata *nd)
  88 {
  89         struct dentry *de;
  90         struct net *net;
  91
  92         de = ERR_PTR(-ENOENT);
  93         net = get_proc_task_net(dir);
  94         if (net != NULL) {
  95                 de = proc_lookup_de(net->proc_net, dir, dentry);
  96                 put_net(net);
  97         }
  98         return de;
  99 }
 100
 101 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
 102                 struct kstat *stat)
 103 {
 104         struct inode *inode = dentry->d_inode;
 105         struct net *net;
 106
 107         net = get_proc_task_net(inode);
 108
 109         generic_fillattr(inode, stat);
 110
 111         if (net != NULL) {
 112                 stat->nlink = net->proc_net->nlink;
 113                 put_net(net);
 114         }
 115
 116         return 0;
 117 }
 118
 119 const struct inode_operations proc_net_inode_operations = {
 120         .lookup         = proc_tgid_net_lookup,
 121         .getattr        = proc_tgid_net_getattr,
 122 };
 123
 124 static int proc_tgid_net_readdir(struct file *filp, void *dirent,
 125                 filldir_t filldir)
 126 {
 127         int ret;
 128         struct net *net;
 129
 130         ret = -EINVAL;
 131         net = get_proc_task_net(filp->f_path.dentry->d_inode);
 132         if (net != NULL) {
 133                 ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
 134                 put_net(net);
 135         }
 136         return ret;
 137 }
 138
 139 const struct file_operations proc_net_operations = {
 140         .read           = generic_read_dir,
 141         .readdir        = proc_tgid_net_readdir,
 142 };
 143
 144 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 145
 146 struct proc_dir_entry *proc_net_fops_create(struct net *net,
 147         const char *name, mode_t mode, const struct file_operations *fops)
 148 {
 149         return proc_create(name, mode, net->proc_net, fops);
 150 }
 151 EXPORT_SYMBOL_GPL(proc_net_fops_create);
 152
 153 void proc_net_remove(struct net *net, const char *name)
 154 {
 155         remove_proc_entry(name, net->proc_net);
 156 }
 157 EXPORT_SYMBOL_GPL(proc_net_remove);
 158
 159 struct net *get_proc_net(const struct inode *inode)
 160 {
 161         return maybe_get_net(PDE_NET(PDE(inode)));
 162 }
 163 EXPORT_SYMBOL_GPL(get_proc_net);
 164
 165 <<<<<<< HEAD:fs/proc/proc_net.c
 166 static struct proc_dir_entry *shadow_pde;
 167
 168 static struct proc_dir_entry *proc_net_shadow(struct task_struct *task,
 169                                                 struct proc_dir_entry *de)
 170 {
 171         return task->nsproxy->net_ns->proc_net;
 172 }
 173
 174 =======
 175 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 176 struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name,
 177                 struct proc_dir_entry *parent)
 178 {
 179         struct proc_dir_entry *pde;
 180         pde = proc_mkdir_mode(name, S_IRUGO | S_IXUGO, parent);
 181         if (pde != NULL)
 182                 pde->data = net;
 183         return pde;
 184 }
 185 EXPORT_SYMBOL_GPL(proc_net_mkdir);
 186
 187 static __net_init int proc_net_ns_init(struct net *net)
 188 {
 189 <<<<<<< HEAD:fs/proc/proc_net.c
 190         struct proc_dir_entry *root, *netd, *net_statd;
 191 =======
 192         struct proc_dir_entry *netd, *net_statd;
 193 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 194         int err;
 195
 196         err = -ENOMEM;
 197 <<<<<<< HEAD:fs/proc/proc_net.c
 198         root = kzalloc(sizeof(*root), GFP_KERNEL);
 199         if (!root)
 200 =======
 201         netd = kzalloc(sizeof(*netd), GFP_KERNEL);
 202         if (!netd)
 203 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 204                 goto out;
 205
 206 <<<<<<< HEAD:fs/proc/proc_net.c
 207         err = -EEXIST;
 208         netd = proc_net_mkdir(net, "net", root);
 209         if (!netd)
 210                 goto free_root;
 211 =======
 212         netd->data = net;
 213         netd->nlink = 2;
 214         netd->name = "net";
 215         netd->namelen = 3;
 216         netd->parent = &proc_root;
 217 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 218
 219         err = -EEXIST;
 220         net_statd = proc_net_mkdir(net, "stat", netd);
 221         if (!net_statd)
 222                 goto free_net;
 223
 224 <<<<<<< HEAD:fs/proc/proc_net.c
 225         root->data = net;
 226
 227         net->proc_net_root = root;
 228 =======
 229 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 230         net->proc_net = netd;
 231         net->proc_net_stat = net_statd;
 232 <<<<<<< HEAD:fs/proc/proc_net.c
 233         err = 0;
 234 =======
 235         return 0;
 236 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 237
 238 <<<<<<< HEAD:fs/proc/proc_net.c
 239 =======
 240 free_net:
 241         kfree(netd);
 242 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 243 out:
 244         return err;
 245 <<<<<<< HEAD:fs/proc/proc_net.c
 246 free_net:
 247         remove_proc_entry("net", root);
 248 free_root:
 249         kfree(root);
 250         goto out;
 251 =======
 252 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 253 }
 254
 255 static __net_exit void proc_net_ns_exit(struct net *net)
 256 {
 257         remove_proc_entry("stat", net->proc_net);
 258 <<<<<<< HEAD:fs/proc/proc_net.c
 259         remove_proc_entry("net", net->proc_net_root);
 260         kfree(net->proc_net_root);
 261 =======
 262         kfree(net->proc_net);
 263 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 264 }
 265
 266 static struct pernet_operations __net_initdata proc_net_ns_ops = {
 267         .init = proc_net_ns_init,
 268         .exit = proc_net_ns_exit,
 269 };
 270
 271 int __init proc_net_init(void)
 272 {
 273 <<<<<<< HEAD:fs/proc/proc_net.c
 274         shadow_pde = proc_mkdir("net", NULL);
 275         shadow_pde->shadow_proc = proc_net_shadow;
 276 =======
 277         proc_symlink("net", NULL, "self/net");
 278 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:fs/proc/proc_net.c
 279
 280         return register_pernet_subsys(&proc_net_ns_ops);
 281 }