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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                 ns = task_nsproxy(task);
117                 if (ns != NULL)
118                         net = get_net(ns->net_ns);
119         }
120         rcu_read_unlock();
121 
122         return net;
123 }
124 
125 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
126                 struct dentry *dentry, unsigned int flags)
127 {
128         struct dentry *de;
129         struct net *net;
130 
131         de = ERR_PTR(-ENOENT);
132         net = get_proc_task_net(dir);
133         if (net != NULL) {
134                 de = proc_lookup_de(net->proc_net, dir, dentry);
135                 put_net(net);
136         }
137         return de;
138 }
139 
140 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
141                 struct kstat *stat)
142 {
143         struct inode *inode = dentry->d_inode;
144         struct net *net;
145 
146         net = get_proc_task_net(inode);
147 
148         generic_fillattr(inode, stat);
149 
150         if (net != NULL) {
151                 stat->nlink = net->proc_net->nlink;
152                 put_net(net);
153         }
154 
155         return 0;
156 }
157 
158 const struct inode_operations proc_net_inode_operations = {
159         .lookup         = proc_tgid_net_lookup,
160         .getattr        = proc_tgid_net_getattr,
161 };
162 
163 static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
164 {
165         int ret;
166         struct net *net;
167 
168         ret = -EINVAL;
169         net = get_proc_task_net(file_inode(file));
170         if (net != NULL) {
171                 ret = proc_readdir_de(net->proc_net, file, ctx);
172                 put_net(net);
173         }
174         return ret;
175 }
176 
177 const struct file_operations proc_net_operations = {
178         .llseek         = generic_file_llseek,
179         .read           = generic_read_dir,
180         .iterate        = proc_tgid_net_readdir,
181 };
182 
183 static __net_init int proc_net_ns_init(struct net *net)
184 {
185         struct proc_dir_entry *netd, *net_statd;
186         int err;
187 
188         err = -ENOMEM;
189         netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL);
190         if (!netd)
191                 goto out;
192 
193         netd->data = net;
194         netd->nlink = 2;
195         netd->namelen = 3;
196         netd->parent = &proc_root;
197         memcpy(netd->name, "net", 4);
198 
199         err = -EEXIST;
200         net_statd = proc_net_mkdir(net, "stat", netd);
201         if (!net_statd)
202                 goto free_net;
203 
204         net->proc_net = netd;
205         net->proc_net_stat = net_statd;
206         return 0;
207 
208 free_net:
209         kfree(netd);
210 out:
211         return err;
212 }
213 
214 static __net_exit void proc_net_ns_exit(struct net *net)
215 {
216         remove_proc_entry("stat", net->proc_net);
217         kfree(net->proc_net);
218 }
219 
220 static struct pernet_operations __net_initdata proc_net_ns_ops = {
221         .init = proc_net_ns_init,
222         .exit = proc_net_ns_exit,
223 };
224 
225 int __init proc_net_init(void)
226 {
227         proc_symlink("net", NULL, "self/net");
228 
229         return register_pernet_subsys(&proc_net_ns_ops);
230 }
231 

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