Commit | Line | Data |
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3c12afe7 DM |
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 | ||
7c0f6ba6 | 11 | #include <linux/uaccess.h> |
3c12afe7 DM |
12 | |
13 | #include <linux/errno.h> | |
14 | #include <linux/time.h> | |
15 | #include <linux/proc_fs.h> | |
16 | #include <linux/stat.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
3c12afe7 DM |
18 | #include <linux/init.h> |
19 | #include <linux/sched.h> | |
f719ff9b | 20 | #include <linux/sched/task.h> |
3c12afe7 DM |
21 | #include <linux/module.h> |
22 | #include <linux/bitops.h> | |
3c12afe7 DM |
23 | #include <linux/mount.h> |
24 | #include <linux/nsproxy.h> | |
c110486f | 25 | #include <linux/uidgid.h> |
3c12afe7 | 26 | #include <net/net_namespace.h> |
e372c414 | 27 | #include <linux/seq_file.h> |
3c12afe7 DM |
28 | |
29 | #include "internal.h" | |
30 | ||
4abfd029 DH |
31 | static inline struct net *PDE_NET(struct proc_dir_entry *pde) |
32 | { | |
33 | return pde->parent->data; | |
34 | } | |
3c12afe7 | 35 | |
8086cd45 AB |
36 | static struct net *get_proc_net(const struct inode *inode) |
37 | { | |
38 | return maybe_get_net(PDE_NET(PDE(inode))); | |
39 | } | |
40 | ||
e372c414 DL |
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 | } | |
1218854a | 58 | #ifdef CONFIG_NET_NS |
e372c414 | 59 | p->net = net; |
1218854a | 60 | #endif |
e372c414 DL |
61 | return 0; |
62 | } | |
63 | EXPORT_SYMBOL_GPL(seq_open_net); | |
64 | ||
de05c557 PE |
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 | ||
e372c414 DL |
89 | int seq_release_net(struct inode *ino, struct file *f) |
90 | { | |
91 | struct seq_file *seq; | |
e372c414 DL |
92 | |
93 | seq = f->private_data; | |
e372c414 | 94 | |
1218854a | 95 | put_net(seq_file_net(seq)); |
e372c414 DL |
96 | seq_release_private(ino, f); |
97 | return 0; | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(seq_release_net); | |
100 | ||
b6fcbdb4 PE |
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 | ||
e9720acd PE |
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) { | |
728dba3a EB |
118 | task_lock(task); |
119 | ns = task->nsproxy; | |
e9720acd PE |
120 | if (ns != NULL) |
121 | net = get_net(ns->net_ns); | |
728dba3a | 122 | task_unlock(task); |
e9720acd PE |
123 | } |
124 | rcu_read_unlock(); | |
125 | ||
126 | return net; | |
127 | } | |
128 | ||
129 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
00cd8dd3 | 130 | struct dentry *dentry, unsigned int flags) |
e9720acd PE |
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(net->proc_net, dir, dentry); | |
139 | put_net(net); | |
140 | } | |
141 | return de; | |
142 | } | |
143 | ||
a528d35e DH |
144 | static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat, |
145 | u32 request_mask, unsigned int query_flags) | |
e9720acd | 146 | { |
a528d35e | 147 | struct inode *inode = d_inode(path->dentry); |
e9720acd PE |
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 | ||
f0c3b509 | 167 | static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx) |
e9720acd PE |
168 | { |
169 | int ret; | |
170 | struct net *net; | |
171 | ||
172 | ret = -EINVAL; | |
f0c3b509 | 173 | net = get_proc_task_net(file_inode(file)); |
e9720acd | 174 | if (net != NULL) { |
f0c3b509 | 175 | ret = proc_readdir_de(net->proc_net, file, ctx); |
e9720acd PE |
176 | put_net(net); |
177 | } | |
178 | return ret; | |
179 | } | |
180 | ||
181 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 182 | .llseek = generic_file_llseek, |
e9720acd | 183 | .read = generic_read_dir, |
f50752ea | 184 | .iterate_shared = proc_tgid_net_readdir, |
e9720acd PE |
185 | }; |
186 | ||
4665079c | 187 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 188 | { |
e9720acd | 189 | struct proc_dir_entry *netd, *net_statd; |
c110486f DT |
190 | kuid_t uid; |
191 | kgid_t gid; | |
3c12afe7 DM |
192 | int err; |
193 | ||
194 | err = -ENOMEM; | |
09570f91 | 195 | netd = kzalloc(sizeof(*netd) + 4, GFP_KERNEL); |
e9720acd | 196 | if (!netd) |
3c12afe7 DM |
197 | goto out; |
198 | ||
710585d4 | 199 | netd->subdir = RB_ROOT; |
e9720acd PE |
200 | netd->data = net; |
201 | netd->nlink = 2; | |
e9720acd PE |
202 | netd->namelen = 3; |
203 | netd->parent = &proc_root; | |
09570f91 | 204 | memcpy(netd->name, "net", 4); |
3c12afe7 | 205 | |
c110486f DT |
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 | ||
3c12afe7 | 216 | err = -EEXIST; |
e5d69b9f | 217 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
218 | if (!net_statd) |
219 | goto free_net; | |
220 | ||
3c12afe7 DM |
221 | net->proc_net = netd; |
222 | net->proc_net_stat = net_statd; | |
e9720acd | 223 | return 0; |
3c12afe7 | 224 | |
e9720acd PE |
225 | free_net: |
226 | kfree(netd); | |
3c12afe7 DM |
227 | out: |
228 | return err; | |
3c12afe7 DM |
229 | } |
230 | ||
4665079c | 231 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
232 | { |
233 | remove_proc_entry("stat", net->proc_net); | |
e9720acd | 234 | kfree(net->proc_net); |
3c12afe7 DM |
235 | } |
236 | ||
022cbae6 | 237 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
238 | .init = proc_net_ns_init, |
239 | .exit = proc_net_ns_exit, | |
240 | }; | |
241 | ||
4665079c | 242 | int __init proc_net_init(void) |
3c12afe7 | 243 | { |
155134fe | 244 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
245 | |
246 | return register_pernet_subsys(&proc_net_ns_ops); | |
247 | } |