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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 <linux/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/sched/task.h>
 21 #include <linux/module.h>
 22 #include <linux/bitops.h>
 23 #include <linux/mount.h>
 24 #include <linux/nsproxy.h>
 25 #include <linux/uidgid.h>
 26 #include <net/net_namespace.h>
 27 #include <linux/seq_file.h>
 28 
 29 #include "internal.h"
 30 
 31 static inline struct net *PDE_NET(struct proc_dir_entry *pde)
 32 {
 33         return pde->parent->data;
 34 }
 35 
 36 static struct net *get_proc_net(const struct inode *inode)
 37 {
 38         return maybe_get_net(PDE_NET(PDE(inode)));
 39 }
 40 
 41 int seq_open_net(struct inode *ino, struct file *f,
 42                  const struct seq_operations *ops, int size)
 43 {
 44         struct net *net;
 45         struct seq_net_private *p;
 46 
 47         BUG_ON(size < sizeof(*p));
 48 
 49         net = get_proc_net(ino);
 50         if (net == NULL)
 51                 return -ENXIO;
 52 
 53         p = __seq_open_private(f, ops, size);
 54         if (p == NULL) {
 55                 put_net(net);
 56                 return -ENOMEM;
 57         }
 58 #ifdef CONFIG_NET_NS
 59         p->net = net;
 60 #endif
 61         return 0;
 62 }
 63 EXPORT_SYMBOL_GPL(seq_open_net);
 64 
 65 int single_open_net(struct inode *inode, struct file *file,
 66                 int (*show)(struct seq_file *, void *))
 67 {
 68         int err;
 69         struct net *net;
 70 
 71         err = -ENXIO;
 72         net = get_proc_net(inode);
 73         if (net == NULL)
 74                 goto err_net;
 75 
 76         err = single_open(file, show, net);
 77         if (err < 0)
 78                 goto err_open;
 79 
 80         return 0;
 81 
 82 err_open:
 83         put_net(net);
 84 err_net:
 85         return err;
 86 }
 87 EXPORT_SYMBOL_GPL(single_open_net);
 88 
 89 int seq_release_net(struct inode *ino, struct file *f)
 90 {
 91         struct seq_file *seq;
 92 
 93         seq = f->private_data;
 94 
 95         put_net(seq_file_net(seq));
 96         seq_release_private(ino, f);
 97         return 0;
 98 }
 99 EXPORT_SYMBOL_GPL(seq_release_net);
100 
101 int single_release_net(struct inode *ino, struct file *f)
102 {
103         struct seq_file *seq = f->private_data;
104         put_net(seq->private);
105         return single_release(ino, f);
106 }
107 EXPORT_SYMBOL_GPL(single_release_net);
108 
109 static struct net *get_proc_task_net(struct inode *dir)
110 {
111         struct task_struct *task;
112         struct nsproxy *ns;
113         struct net *net = NULL;
114 
115         rcu_read_lock();
116         task = pid_task(proc_pid(dir), PIDTYPE_PID);
117         if (task != NULL) {
118                 task_lock(task);
119                 ns = task->nsproxy;
120                 if (ns != NULL)
121                         net = get_net(ns->net_ns);
122                 task_unlock(task);
123         }
124         rcu_read_unlock();
125 
126         return net;
127 }
128 
129 static struct dentry *proc_tgid_net_lookup(struct inode *dir,
130                 struct dentry *dentry, unsigned int flags)
131 {
132         struct dentry *de;
133         struct net *net;
134 
135         de = ERR_PTR(-ENOENT);
136         net = get_proc_task_net(dir);
137         if (net != NULL) {
138                 de = proc_lookup_de(dir, dentry, net->proc_net);
139                 put_net(net);
140         }
141         return de;
142 }
143 
144 static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat,
145                                  u32 request_mask, unsigned int query_flags)
146 {
147         struct inode *inode = d_inode(path->dentry);
148         struct net *net;
149 
150         net = get_proc_task_net(inode);
151 
152         generic_fillattr(inode, stat);
153 
154         if (net != NULL) {
155                 stat->nlink = net->proc_net->nlink;
156                 put_net(net);
157         }
158 
159         return 0;
160 }
161 
162 const struct inode_operations proc_net_inode_operations = {
163         .lookup         = proc_tgid_net_lookup,
164         .getattr        = proc_tgid_net_getattr,
165 };
166 
167 static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
168 {
169         int ret;
170         struct net *net;
171 
172         ret = -EINVAL;
173         net = get_proc_task_net(file_inode(file));
174         if (net != NULL) {
175                 ret = proc_readdir_de(file, ctx, net->proc_net);
176                 put_net(net);
177         }
178         return ret;
179 }
180 
181 const struct file_operations proc_net_operations = {
182         .llseek         = generic_file_llseek,
183         .read           = generic_read_dir,
184         .iterate_shared = proc_tgid_net_readdir,
185 };
186 
187 static __net_init int proc_net_ns_init(struct net *net)
188 {
189         struct proc_dir_entry *netd, *net_statd;
190         kuid_t uid;
191         kgid_t gid;
192         int err;
193 
194         err = -ENOMEM;
195         netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL);
196         if (!netd)
197                 goto out;
198 
199         netd->subdir = RB_ROOT_CACHED;
200         netd->data = net;
201         netd->nlink = 2;
202         netd->namelen = 3;
203         netd->parent = &proc_root;
204         memcpy(netd->name, "net", 4);
205 
206         uid = make_kuid(net->user_ns, 0);
207         if (!uid_valid(uid))
208                 uid = netd->uid;
209 
210         gid = make_kgid(net->user_ns, 0);
211         if (!gid_valid(gid))
212                 gid = netd->gid;
213 
214         proc_set_user(netd, uid, gid);
215 
216         err = -EEXIST;
217         net_statd = proc_net_mkdir(net, "stat", netd);
218         if (!net_statd)
219                 goto free_net;
220 
221         net->proc_net = netd;
222         net->proc_net_stat = net_statd;
223         return 0;
224 
225 free_net:
226         kfree(netd);
227 out:
228         return err;
229 }
230 
231 static __net_exit void proc_net_ns_exit(struct net *net)
232 {
233         remove_proc_entry("stat", net->proc_net);
234         kfree(net->proc_net);
235 }
236 
237 static struct pernet_operations __net_initdata proc_net_ns_ops = {
238         .init = proc_net_ns_init,
239         .exit = proc_net_ns_exit,
240 };
241 
242 int __init proc_net_init(void)
243 {
244         proc_symlink("net", NULL, "self/net");
245 
246         return register_pernet_subsys(&proc_net_ns_ops);
247 }
248 

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