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 | ||
c3506372 | 41 | static int seq_open_net(struct inode *inode, struct file *file) |
e372c414 | 42 | { |
c3506372 | 43 | unsigned int state_size = PDE(inode)->state_size; |
e372c414 | 44 | struct seq_net_private *p; |
c3506372 | 45 | struct net *net; |
e372c414 | 46 | |
c3506372 | 47 | WARN_ON_ONCE(state_size < sizeof(*p)); |
e372c414 | 48 | |
c3506372 CH |
49 | net = get_proc_net(inode); |
50 | if (!net) | |
e372c414 DL |
51 | return -ENXIO; |
52 | ||
c3506372 CH |
53 | p = __seq_open_private(file, PDE(inode)->seq_ops, state_size); |
54 | if (!p) { | |
e372c414 DL |
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 | } | |
c3506372 CH |
63 | |
64 | static int seq_release_net(struct inode *ino, struct file *f) | |
65 | { | |
66 | struct seq_file *seq = f->private_data; | |
67 | ||
68 | put_net(seq_file_net(seq)); | |
69 | seq_release_private(ino, f); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static const struct file_operations proc_net_seq_fops = { | |
74 | .open = seq_open_net, | |
75 | .read = seq_read, | |
76 | .llseek = seq_lseek, | |
77 | .release = seq_release_net, | |
78 | }; | |
79 | ||
80 | struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode, | |
81 | struct proc_dir_entry *parent, const struct seq_operations *ops, | |
82 | unsigned int state_size, void *data) | |
83 | { | |
84 | struct proc_dir_entry *p; | |
85 | ||
86 | p = proc_create_reg(name, mode, &parent, data); | |
87 | if (!p) | |
88 | return NULL; | |
89 | p->proc_fops = &proc_net_seq_fops; | |
90 | p->seq_ops = ops; | |
91 | p->state_size = state_size; | |
92 | return proc_register(parent, p); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(proc_create_net_data); | |
e372c414 | 95 | |
3617d949 | 96 | static int single_open_net(struct inode *inode, struct file *file) |
de05c557 | 97 | { |
3617d949 | 98 | struct proc_dir_entry *de = PDE(inode); |
de05c557 | 99 | struct net *net; |
3617d949 | 100 | int err; |
de05c557 | 101 | |
de05c557 | 102 | net = get_proc_net(inode); |
3617d949 CH |
103 | if (!net) |
104 | return -ENXIO; | |
de05c557 | 105 | |
3617d949 CH |
106 | err = single_open(file, de->single_show, net); |
107 | if (err) | |
108 | put_net(net); | |
de05c557 PE |
109 | return err; |
110 | } | |
de05c557 | 111 | |
3617d949 | 112 | static int single_release_net(struct inode *ino, struct file *f) |
b6fcbdb4 PE |
113 | { |
114 | struct seq_file *seq = f->private_data; | |
115 | put_net(seq->private); | |
116 | return single_release(ino, f); | |
117 | } | |
3617d949 CH |
118 | |
119 | static const struct file_operations proc_net_single_fops = { | |
120 | .open = single_open_net, | |
121 | .read = seq_read, | |
122 | .llseek = seq_lseek, | |
123 | .release = single_release_net, | |
124 | }; | |
125 | ||
126 | struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode, | |
127 | struct proc_dir_entry *parent, | |
128 | int (*show)(struct seq_file *, void *), void *data) | |
129 | { | |
130 | struct proc_dir_entry *p; | |
131 | ||
132 | p = proc_create_reg(name, mode, &parent, data); | |
133 | if (!p) | |
134 | return NULL; | |
135 | p->proc_fops = &proc_net_single_fops; | |
136 | p->single_show = show; | |
137 | return proc_register(parent, p); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(proc_create_net_single); | |
b6fcbdb4 | 140 | |
e9720acd PE |
141 | static struct net *get_proc_task_net(struct inode *dir) |
142 | { | |
143 | struct task_struct *task; | |
144 | struct nsproxy *ns; | |
145 | struct net *net = NULL; | |
146 | ||
147 | rcu_read_lock(); | |
148 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
149 | if (task != NULL) { | |
728dba3a EB |
150 | task_lock(task); |
151 | ns = task->nsproxy; | |
e9720acd PE |
152 | if (ns != NULL) |
153 | net = get_net(ns->net_ns); | |
728dba3a | 154 | task_unlock(task); |
e9720acd PE |
155 | } |
156 | rcu_read_unlock(); | |
157 | ||
158 | return net; | |
159 | } | |
160 | ||
161 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
00cd8dd3 | 162 | struct dentry *dentry, unsigned int flags) |
e9720acd PE |
163 | { |
164 | struct dentry *de; | |
165 | struct net *net; | |
166 | ||
167 | de = ERR_PTR(-ENOENT); | |
168 | net = get_proc_task_net(dir); | |
169 | if (net != NULL) { | |
93ad5bc6 | 170 | de = proc_lookup_de(dir, dentry, net->proc_net); |
e9720acd PE |
171 | put_net(net); |
172 | } | |
173 | return de; | |
174 | } | |
175 | ||
a528d35e DH |
176 | static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat, |
177 | u32 request_mask, unsigned int query_flags) | |
e9720acd | 178 | { |
a528d35e | 179 | struct inode *inode = d_inode(path->dentry); |
e9720acd PE |
180 | struct net *net; |
181 | ||
182 | net = get_proc_task_net(inode); | |
183 | ||
184 | generic_fillattr(inode, stat); | |
185 | ||
186 | if (net != NULL) { | |
187 | stat->nlink = net->proc_net->nlink; | |
188 | put_net(net); | |
189 | } | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | const struct inode_operations proc_net_inode_operations = { | |
195 | .lookup = proc_tgid_net_lookup, | |
196 | .getattr = proc_tgid_net_getattr, | |
197 | }; | |
198 | ||
f0c3b509 | 199 | static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx) |
e9720acd PE |
200 | { |
201 | int ret; | |
202 | struct net *net; | |
203 | ||
204 | ret = -EINVAL; | |
f0c3b509 | 205 | net = get_proc_task_net(file_inode(file)); |
e9720acd | 206 | if (net != NULL) { |
93ad5bc6 | 207 | ret = proc_readdir_de(file, ctx, net->proc_net); |
e9720acd PE |
208 | put_net(net); |
209 | } | |
210 | return ret; | |
211 | } | |
212 | ||
213 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 214 | .llseek = generic_file_llseek, |
e9720acd | 215 | .read = generic_read_dir, |
f50752ea | 216 | .iterate_shared = proc_tgid_net_readdir, |
e9720acd PE |
217 | }; |
218 | ||
4665079c | 219 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 220 | { |
e9720acd | 221 | struct proc_dir_entry *netd, *net_statd; |
c110486f DT |
222 | kuid_t uid; |
223 | kgid_t gid; | |
3c12afe7 DM |
224 | int err; |
225 | ||
226 | err = -ENOMEM; | |
b4884f23 | 227 | netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL); |
e9720acd | 228 | if (!netd) |
3c12afe7 DM |
229 | goto out; |
230 | ||
4f113437 | 231 | netd->subdir = RB_ROOT; |
e9720acd PE |
232 | netd->data = net; |
233 | netd->nlink = 2; | |
e9720acd PE |
234 | netd->namelen = 3; |
235 | netd->parent = &proc_root; | |
b4884f23 | 236 | netd->name = netd->inline_name; |
09570f91 | 237 | memcpy(netd->name, "net", 4); |
3c12afe7 | 238 | |
c110486f DT |
239 | uid = make_kuid(net->user_ns, 0); |
240 | if (!uid_valid(uid)) | |
241 | uid = netd->uid; | |
242 | ||
243 | gid = make_kgid(net->user_ns, 0); | |
244 | if (!gid_valid(gid)) | |
245 | gid = netd->gid; | |
246 | ||
247 | proc_set_user(netd, uid, gid); | |
248 | ||
3c12afe7 | 249 | err = -EEXIST; |
e5d69b9f | 250 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
251 | if (!net_statd) |
252 | goto free_net; | |
253 | ||
3c12afe7 DM |
254 | net->proc_net = netd; |
255 | net->proc_net_stat = net_statd; | |
e9720acd | 256 | return 0; |
3c12afe7 | 257 | |
e9720acd | 258 | free_net: |
b4884f23 | 259 | pde_free(netd); |
3c12afe7 DM |
260 | out: |
261 | return err; | |
3c12afe7 DM |
262 | } |
263 | ||
4665079c | 264 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
265 | { |
266 | remove_proc_entry("stat", net->proc_net); | |
b4884f23 | 267 | pde_free(net->proc_net); |
3c12afe7 DM |
268 | } |
269 | ||
022cbae6 | 270 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
271 | .init = proc_net_ns_init, |
272 | .exit = proc_net_ns_exit, | |
273 | }; | |
274 | ||
4665079c | 275 | int __init proc_net_init(void) |
3c12afe7 | 276 | { |
155134fe | 277 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
278 | |
279 | return register_pernet_subsys(&proc_net_ns_ops); | |
280 | } |