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Linux/fs/proc/proc_net.c

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  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/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 <net/net_namespace.h>
 25 #include <linux/seq_file.h>
 26 
 27 #include "internal.h"
 28 
 29 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 30 {
 31         return pde->parent->data;
 32 }
 33 
 34 static struct net *get_proc_net(const struct inode *inode)
 35 {
 36         return maybe_get_net(PDE_NET(PDE(inode)));
 37 }
 38 
 39 int seq_open_net(struct inode *ino, struct file *f,
 40                  const struct seq_operations *ops, int size)
 41 {
 42         struct net *net;
 43         struct seq_net_private *p;
 44 
 45         BUG_ON(size < sizeof(*p));
 46 
 47         net = get_proc_net(ino);
 48         if (net == NULL)
 49                 return -ENXIO;
 50 
 51         p = __seq_open_private(f, ops, size);
 52         if (p == NULL) {
 53                 put_net(net);
 54                 return -ENOMEM;
 55         }
 56 #ifdef CONFIG_NET_NS
 57         p->net = net;
 58 #endif
 59         return 0;
 60 }
 61 EXPORT_SYMBOL_GPL(seq_open_net);
 62 
 63 int single_open_net(struct inode *inode, struct file *file,
 64                 int (*show)(struct seq_file *, void *))
 65 {
 66         int err;
 67         struct net *net;
 68 
 69         err = -ENXIO;
 70         net = get_proc_net(inode);
 71         if (net == NULL)
 72                 goto err_net;
 73 
 74         err = single_open(file, show, net);
 75         if (err < 0)
 76                 goto err_open;
 77 
 78         return 0;
 79 
 80 err_open:
 81         put_net(net);
 82 err_net:
 83         return err;
 84 }
 85 EXPORT_SYMBOL_GPL(single_open_net);
 86 
 87 int seq_release_net(struct inode *ino, struct file *f)
 88 {
 89         struct seq_file *seq;
 90 
 91         seq = f->private_data;
 92 
 93         put_net(seq_file_net(seq));
 94         seq_release_private(ino, f);
 95         return 0;
 96 }
 97 EXPORT_SYMBOL_GPL(seq_release_net);
 98 
 99 int single_release_net(struct inode *ino, struct file *f)
100 {
101         struct seq_file *seq = f->private_data;
102         put_net(seq->private);
103         return single_release(ino, f);
104 }
105 EXPORT_SYMBOL_GPL(single_release_net);
106 
107 static struct net *get_proc_task_net(struct inode *dir)
108 {
109         struct task_struct *task;
110         struct nsproxy *ns;
111         struct net *net = NULL;
112 
113         rcu_read_lock();
114         task = pid_task(proc_pid(dir), PIDTYPE_PID);
115         if (task != NULL) {
116                 task_lock(task);
117                 ns = task->nsproxy;
118                 if (ns != NULL)
119                         net = get_net(ns->net_ns);
120                 task_unlock(task);
121         }
122         rcu_read_unlock();
123 
124         return net;
125 }
126 
127 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
128                 struct dentry *dentry, unsigned int flags)
129 {
130         struct dentry *de;
131         struct net *net;
132 
133         de = ERR_PTR(-ENOENT);
134         net = get_proc_task_net(dir);
135         if (net != NULL) {
136                 de = proc_lookup_de(net->proc_net, dir, dentry);
137                 put_net(net);
138         }
139         return de;
140 }
141 
142 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
143                 struct kstat *stat)
144 {
145         struct inode *inode = dentry->d_inode;
146         struct net *net;
147 
148         net = get_proc_task_net(inode);
149 
150         generic_fillattr(inode, stat);
151 
152         if (net != NULL) {
153                 stat->nlink = net->proc_net->nlink;
154                 put_net(net);
155         }
156 
157         return 0;
158 }
159 
160 const struct inode_operations proc_net_inode_operations = {
161         .lookup         = proc_tgid_net_lookup,
162         .getattr        = proc_tgid_net_getattr,
163 };
164 
165 static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
166 {
167         int ret;
168         struct net *net;
169 
170         ret = -EINVAL;
171         net = get_proc_task_net(file_inode(file));
172         if (net != NULL) {
173                 ret = proc_readdir_de(net->proc_net, file, ctx);
174                 put_net(net);
175         }
176         return ret;
177 }
178 
179 const struct file_operations proc_net_operations = {
180         .llseek         = generic_file_llseek,
181         .read           = generic_read_dir,
182         .iterate        = proc_tgid_net_readdir,
183 };
184 
185 static __net_init int proc_net_ns_init(struct net *net)
186 {
187         struct proc_dir_entry *netd, *net_statd;
188         int err;
189 
190         err = -ENOMEM;
191         netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL);
192         if (!netd)
193                 goto out;
194 
195         netd->subdir = RB_ROOT;
196         netd->data = net;
197         netd->nlink = 2;
198         netd->namelen = 3;
199         netd->parent = &proc_root;
200         memcpy(netd->name, "net", 4);
201 
202         err = -EEXIST;
203         net_statd = proc_net_mkdir(net, "stat", netd);
204         if (!net_statd)
205                 goto free_net;
206 
207         net->proc_net = netd;
208         net->proc_net_stat = net_statd;
209         return 0;
210 
211 free_net:
212         kfree(netd);
213 out:
214         return err;
215 }
216 
217 static __net_exit void proc_net_ns_exit(struct net *net)
218 {
219         remove_proc_entry("stat", net->proc_net);
220         kfree(net->proc_net);
221 }
222 
223 static struct pernet_operations __net_initdata proc_net_ns_ops = {
224         .init = proc_net_ns_init,
225         .exit = proc_net_ns_exit,
226 };
227 
228 int __init proc_net_init(void)
229 {
230         proc_symlink("net", NULL, "self/net");
231 
232         return register_pernet_subsys(&proc_net_ns_ops);
233 }
234 

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