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/slab.h>
18 #include <linux/init.h>
19 #include <linux/sched.h>
20 #include <linux/module.h>
21 #include <linux/bitops.h>
22 #include <linux/mount.h>
23 #include <linux/nsproxy.h>
24 #include <linux/uidgid.h>
25 #include <net/net_namespace.h>
26 #include <linux/seq_file.h>
30 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
32 return pde->parent->data;
35 static struct net *get_proc_net(const struct inode *inode)
37 return maybe_get_net(PDE_NET(PDE(inode)));
40 int seq_open_net(struct inode *ino, struct file *f,
41 const struct seq_operations *ops, int size)
44 struct seq_net_private *p;
46 BUG_ON(size < sizeof(*p));
48 net = get_proc_net(ino);
52 p = __seq_open_private(f, ops, size);
62 EXPORT_SYMBOL_GPL(seq_open_net);
64 int single_open_net(struct inode *inode, struct file *file,
65 int (*show)(struct seq_file *, void *))
71 net = get_proc_net(inode);
75 err = single_open(file, show, net);
86 EXPORT_SYMBOL_GPL(single_open_net);
88 int seq_release_net(struct inode *ino, struct file *f)
92 seq = f->private_data;
94 put_net(seq_file_net(seq));
95 seq_release_private(ino, f);
98 EXPORT_SYMBOL_GPL(seq_release_net);
100 int single_release_net(struct inode *ino, struct file *f)
102 struct seq_file *seq = f->private_data;
103 put_net(seq->private);
104 return single_release(ino, f);
106 EXPORT_SYMBOL_GPL(single_release_net);
108 static struct net *get_proc_task_net(struct inode *dir)
110 struct task_struct *task;
112 struct net *net = NULL;
115 task = pid_task(proc_pid(dir), PIDTYPE_PID);
120 net = get_net(ns->net_ns);
128 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
129 struct dentry *dentry, unsigned int flags)
134 de = ERR_PTR(-ENOENT);
135 net = get_proc_task_net(dir);
137 de = proc_lookup_de(net->proc_net, dir, dentry);
143 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
146 struct inode *inode = d_inode(dentry);
149 net = get_proc_task_net(inode);
151 generic_fillattr(inode, stat);
154 stat->nlink = net->proc_net->nlink;
161 const struct inode_operations proc_net_inode_operations = {
162 .lookup = proc_tgid_net_lookup,
163 .getattr = proc_tgid_net_getattr,
166 static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
172 net = get_proc_task_net(file_inode(file));
174 ret = proc_readdir_de(net->proc_net, file, ctx);
180 const struct file_operations proc_net_operations = {
181 .llseek = generic_file_llseek,
182 .read = generic_read_dir,
183 .iterate_shared = proc_tgid_net_readdir,
186 static __net_init int proc_net_ns_init(struct net *net)
188 struct proc_dir_entry *netd, *net_statd;
194 netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL);
198 netd->subdir = RB_ROOT;
202 netd->parent = &proc_root;
203 memcpy(netd->name, "net", 4);
205 uid = make_kuid(net->user_ns, 0);
209 gid = make_kgid(net->user_ns, 0);
213 proc_set_user(netd, uid, gid);
216 net_statd = proc_net_mkdir(net, "stat", netd);
220 net->proc_net = netd;
221 net->proc_net_stat = net_statd;
230 static __net_exit void proc_net_ns_exit(struct net *net)
232 remove_proc_entry("stat", net->proc_net);
233 kfree(net->proc_net);
236 static struct pernet_operations __net_initdata proc_net_ns_ops = {
237 .init = proc_net_ns_init,
238 .exit = proc_net_ns_exit,
241 int __init proc_net_init(void)
243 proc_symlink("net", NULL, "self/net");
245 return register_pernet_subsys(&proc_net_ns_ops);