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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->data = net; | |
196 | netd->nlink = 2; | |
197 | netd->namelen = 3; | |
198 | netd->parent = &proc_root; | |
199 | memcpy(netd->name, "net", 4); | |
200 | ||
201 | err = -EEXIST; | |
202 | net_statd = proc_net_mkdir(net, "stat", netd); | |
203 | if (!net_statd) | |
204 | goto free_net; | |
205 | ||
206 | net->proc_net = netd; | |
207 | net->proc_net_stat = net_statd; | |
208 | return 0; | |
209 | ||
210 | free_net: | |
211 | kfree(netd); | |
212 | out: | |
213 | return err; | |
214 | } | |
215 | ||
216 | static __net_exit void proc_net_ns_exit(struct net *net) | |
217 | { | |
218 | remove_proc_entry("stat", net->proc_net); | |
219 | kfree(net->proc_net); | |
220 | } | |
221 | ||
222 | static struct pernet_operations __net_initdata proc_net_ns_ops = { | |
223 | .init = proc_net_ns_init, | |
224 | .exit = proc_net_ns_exit, | |
225 | }; | |
226 | ||
227 | int __init proc_net_init(void) | |
228 | { | |
229 | proc_symlink("net", NULL, "self/net"); | |
230 | ||
231 | return register_pernet_subsys(&proc_net_ns_ops); | |
232 | } |