6 * Author: Eric Biederman <ebiederm@xmission.com>
8 * proc net directory handling functions
11 #include <asm/uaccess.h>
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>
30 int seq_open_net(struct inode *ino, struct file *f,
31 const struct seq_operations *ops, int size)
34 struct seq_net_private *p;
36 BUG_ON(size < sizeof(*p));
38 net = get_proc_net(ino);
42 p = __seq_open_private(f, ops, size);
52 EXPORT_SYMBOL_GPL(seq_open_net);
54 int single_open_net(struct inode *inode, struct file *file,
55 int (*show)(struct seq_file *, void *))
61 net = get_proc_net(inode);
65 err = single_open(file, show, net);
76 EXPORT_SYMBOL_GPL(single_open_net);
78 int seq_release_net(struct inode *ino, struct file *f)
82 seq = f->private_data;
84 put_net(seq_file_net(seq));
85 seq_release_private(ino, f);
88 EXPORT_SYMBOL_GPL(seq_release_net);
90 static struct net *get_proc_task_net(struct inode *dir)
92 struct task_struct *task;
94 struct net *net = NULL;
97 task = pid_task(proc_pid(dir), PIDTYPE_PID);
99 ns = task_nsproxy(task);
101 net = get_net(ns->net_ns);
108 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
109 struct dentry *dentry, struct nameidata *nd)
114 de = ERR_PTR(-ENOENT);
115 net = get_proc_task_net(dir);
117 de = proc_lookup_de(net->proc_net, dir, dentry);
123 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
126 struct inode *inode = dentry->d_inode;
129 net = get_proc_task_net(inode);
131 generic_fillattr(inode, stat);
134 stat->nlink = net->proc_net->nlink;
141 const struct inode_operations proc_net_inode_operations = {
142 .lookup = proc_tgid_net_lookup,
143 .getattr = proc_tgid_net_getattr,
146 static int proc_tgid_net_readdir(struct file *filp, void *dirent,
153 net = get_proc_task_net(filp->f_path.dentry->d_inode);
155 ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
161 const struct file_operations proc_net_operations = {
162 .read = generic_read_dir,
163 .readdir = proc_tgid_net_readdir,
167 struct proc_dir_entry *proc_net_fops_create(struct net *net,
168 const char *name, mode_t mode, const struct file_operations *fops)
170 return proc_create(name, mode, net->proc_net, fops);
172 EXPORT_SYMBOL_GPL(proc_net_fops_create);
174 void proc_net_remove(struct net *net, const char *name)
176 remove_proc_entry(name, net->proc_net);
178 EXPORT_SYMBOL_GPL(proc_net_remove);
180 struct net *get_proc_net(const struct inode *inode)
182 return maybe_get_net(PDE_NET(PDE(inode)));
184 EXPORT_SYMBOL_GPL(get_proc_net);
186 static __net_init int proc_net_ns_init(struct net *net)
188 struct proc_dir_entry *netd, *net_statd;
192 netd = kzalloc(sizeof(*netd), GFP_KERNEL);
200 netd->parent = &proc_root;
203 net_statd = proc_net_mkdir(net, "stat", netd);
207 net->proc_net = netd;
208 net->proc_net_stat = net_statd;
217 static __net_exit void proc_net_ns_exit(struct net *net)
219 remove_proc_entry("stat", net->proc_net);
220 kfree(net->proc_net);
223 static struct pernet_operations __net_initdata proc_net_ns_ops = {
224 .init = proc_net_ns_init,
225 .exit = proc_net_ns_exit,
228 int __init proc_net_init(void)
230 proc_symlink("net", NULL, "self/net");
232 return register_pernet_subsys(&proc_net_ns_ops);