~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/proc/proc_net.c

Version: ~ [ linux-5.6-rc7 ] ~ [ linux-5.5.11 ] ~ [ linux-5.4.27 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.112 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.174 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.217 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.217 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 30 static struct net *get_proc_net(const struct inode *inode)
 31 {
 32         return maybe_get_net(PDE_NET(PDE(inode)));
 33 }
 34 
 35 int seq_open_net(struct inode *ino, struct file *f,
 36                  const struct seq_operations *ops, int size)
 37 {
 38         struct net *net;
 39         struct seq_net_private *p;
 40 
 41         BUG_ON(size < sizeof(*p));
 42 
 43         net = get_proc_net(ino);
 44         if (net == NULL)
 45                 return -ENXIO;
 46 
 47         p = __seq_open_private(f, ops, size);
 48         if (p == NULL) {
 49                 put_net(net);
 50                 return -ENOMEM;
 51         }
 52 #ifdef CONFIG_NET_NS
 53         p->net = net;
 54 #endif
 55         return 0;
 56 }
 57 EXPORT_SYMBOL_GPL(seq_open_net);
 58 
 59 int single_open_net(struct inode *inode, struct file *file,
 60                 int (*show)(struct seq_file *, void *))
 61 {
 62         int err;
 63         struct net *net;
 64 
 65         err = -ENXIO;
 66         net = get_proc_net(inode);
 67         if (net == NULL)
 68                 goto err_net;
 69 
 70         err = single_open(file, show, net);
 71         if (err < 0)
 72                 goto err_open;
 73 
 74         return 0;
 75 
 76 err_open:
 77         put_net(net);
 78 err_net:
 79         return err;
 80 }
 81 EXPORT_SYMBOL_GPL(single_open_net);
 82 
 83 int seq_release_net(struct inode *ino, struct file *f)
 84 {
 85         struct seq_file *seq;
 86 
 87         seq = f->private_data;
 88 
 89         put_net(seq_file_net(seq));
 90         seq_release_private(ino, f);
 91         return 0;
 92 }
 93 EXPORT_SYMBOL_GPL(seq_release_net);
 94 
 95 int single_release_net(struct inode *ino, struct file *f)
 96 {
 97         struct seq_file *seq = f->private_data;
 98         put_net(seq->private);
 99         return single_release(ino, f);
100 }
101 EXPORT_SYMBOL_GPL(single_release_net);
102 
103 static struct net *get_proc_task_net(struct inode *dir)
104 {
105         struct task_struct *task;
106         struct nsproxy *ns;
107         struct net *net = NULL;
108 
109         rcu_read_lock();
110         task = pid_task(proc_pid(dir), PIDTYPE_PID);
111         if (task != NULL) {
112                 ns = task_nsproxy(task);
113                 if (ns != NULL)
114                         net = get_net(ns->net_ns);
115         }
116         rcu_read_unlock();
117 
118         return net;
119 }
120 
121 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
122                 struct dentry *dentry, struct nameidata *nd)
123 {
124         struct dentry *de;
125         struct net *net;
126 
127         de = ERR_PTR(-ENOENT);
128         net = get_proc_task_net(dir);
129         if (net != NULL) {
130                 de = proc_lookup_de(net->proc_net, dir, dentry);
131                 put_net(net);
132         }
133         return de;
134 }
135 
136 static int proc_tgid_net_getattr(struct vfsmount *mnt, struct dentry *dentry,
137                 struct kstat *stat)
138 {
139         struct inode *inode = dentry->d_inode;
140         struct net *net;
141 
142         net = get_proc_task_net(inode);
143 
144         generic_fillattr(inode, stat);
145 
146         if (net != NULL) {
147                 stat->nlink = net->proc_net->nlink;
148                 put_net(net);
149         }
150 
151         return 0;
152 }
153 
154 const struct inode_operations proc_net_inode_operations = {
155         .lookup         = proc_tgid_net_lookup,
156         .getattr        = proc_tgid_net_getattr,
157 };
158 
159 static int proc_tgid_net_readdir(struct file *filp, void *dirent,
160                 filldir_t filldir)
161 {
162         int ret;
163         struct net *net;
164 
165         ret = -EINVAL;
166         net = get_proc_task_net(filp->f_path.dentry->d_inode);
167         if (net != NULL) {
168                 ret = proc_readdir_de(net->proc_net, filp, dirent, filldir);
169                 put_net(net);
170         }
171         return ret;
172 }
173 
174 const struct file_operations proc_net_operations = {
175         .llseek         = generic_file_llseek,
176         .read           = generic_read_dir,
177         .readdir        = proc_tgid_net_readdir,
178 };
179 
180 
181 struct proc_dir_entry *proc_net_fops_create(struct net *net,
182         const char *name, umode_t mode, const struct file_operations *fops)
183 {
184         return proc_create(name, mode, net->proc_net, fops);
185 }
186 EXPORT_SYMBOL_GPL(proc_net_fops_create);
187 
188 void proc_net_remove(struct net *net, const char *name)
189 {
190         remove_proc_entry(name, net->proc_net);
191 }
192 EXPORT_SYMBOL_GPL(proc_net_remove);
193 
194 static __net_init int proc_net_ns_init(struct net *net)
195 {
196         struct proc_dir_entry *netd, *net_statd;
197         int err;
198 
199         err = -ENOMEM;
200         netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL);
201         if (!netd)
202                 goto out;
203 
204         netd->data = net;
205         netd->nlink = 2;
206         netd->namelen = 3;
207         netd->parent = &proc_root;
208         memcpy(netd->name, "net", 4);
209 
210         err = -EEXIST;
211         net_statd = proc_net_mkdir(net, "stat", netd);
212         if (!net_statd)
213                 goto free_net;
214 
215         net->proc_net = netd;
216         net->proc_net_stat = net_statd;
217         return 0;
218 
219 free_net:
220         kfree(netd);
221 out:
222         return err;
223 }
224 
225 static __net_exit void proc_net_ns_exit(struct net *net)
226 {
227         remove_proc_entry("stat", net->proc_net);
228         kfree(net->proc_net);
229 }
230 
231 static struct pernet_operations __net_initdata proc_net_ns_ops = {
232         .init = proc_net_ns_init,
233         .exit = proc_net_ns_exit,
234 };
235 
236 int __init proc_net_init(void)
237 {
238         proc_symlink("net", NULL, "self/net");
239 
240         return register_pernet_subsys(&proc_net_ns_ops);
241 }
242 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp