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