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 | |
de05c557 PE |
96 | int single_open_net(struct inode *inode, struct file *file, |
97 | int (*show)(struct seq_file *, void *)) | |
98 | { | |
99 | int err; | |
100 | struct net *net; | |
101 | ||
102 | err = -ENXIO; | |
103 | net = get_proc_net(inode); | |
104 | if (net == NULL) | |
105 | goto err_net; | |
106 | ||
107 | err = single_open(file, show, net); | |
108 | if (err < 0) | |
109 | goto err_open; | |
110 | ||
111 | return 0; | |
112 | ||
113 | err_open: | |
114 | put_net(net); | |
115 | err_net: | |
116 | return err; | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(single_open_net); | |
119 | ||
b6fcbdb4 PE |
120 | int single_release_net(struct inode *ino, struct file *f) |
121 | { | |
122 | struct seq_file *seq = f->private_data; | |
123 | put_net(seq->private); | |
124 | return single_release(ino, f); | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(single_release_net); | |
127 | ||
e9720acd PE |
128 | static struct net *get_proc_task_net(struct inode *dir) |
129 | { | |
130 | struct task_struct *task; | |
131 | struct nsproxy *ns; | |
132 | struct net *net = NULL; | |
133 | ||
134 | rcu_read_lock(); | |
135 | task = pid_task(proc_pid(dir), PIDTYPE_PID); | |
136 | if (task != NULL) { | |
728dba3a EB |
137 | task_lock(task); |
138 | ns = task->nsproxy; | |
e9720acd PE |
139 | if (ns != NULL) |
140 | net = get_net(ns->net_ns); | |
728dba3a | 141 | task_unlock(task); |
e9720acd PE |
142 | } |
143 | rcu_read_unlock(); | |
144 | ||
145 | return net; | |
146 | } | |
147 | ||
148 | static struct dentry *proc_tgid_net_lookup(struct inode *dir, | |
00cd8dd3 | 149 | struct dentry *dentry, unsigned int flags) |
e9720acd PE |
150 | { |
151 | struct dentry *de; | |
152 | struct net *net; | |
153 | ||
154 | de = ERR_PTR(-ENOENT); | |
155 | net = get_proc_task_net(dir); | |
156 | if (net != NULL) { | |
93ad5bc6 | 157 | de = proc_lookup_de(dir, dentry, net->proc_net); |
e9720acd PE |
158 | put_net(net); |
159 | } | |
160 | return de; | |
161 | } | |
162 | ||
a528d35e DH |
163 | static int proc_tgid_net_getattr(const struct path *path, struct kstat *stat, |
164 | u32 request_mask, unsigned int query_flags) | |
e9720acd | 165 | { |
a528d35e | 166 | struct inode *inode = d_inode(path->dentry); |
e9720acd PE |
167 | struct net *net; |
168 | ||
169 | net = get_proc_task_net(inode); | |
170 | ||
171 | generic_fillattr(inode, stat); | |
172 | ||
173 | if (net != NULL) { | |
174 | stat->nlink = net->proc_net->nlink; | |
175 | put_net(net); | |
176 | } | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | const struct inode_operations proc_net_inode_operations = { | |
182 | .lookup = proc_tgid_net_lookup, | |
183 | .getattr = proc_tgid_net_getattr, | |
184 | }; | |
185 | ||
f0c3b509 | 186 | static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx) |
e9720acd PE |
187 | { |
188 | int ret; | |
189 | struct net *net; | |
190 | ||
191 | ret = -EINVAL; | |
f0c3b509 | 192 | net = get_proc_task_net(file_inode(file)); |
e9720acd | 193 | if (net != NULL) { |
93ad5bc6 | 194 | ret = proc_readdir_de(file, ctx, net->proc_net); |
e9720acd PE |
195 | put_net(net); |
196 | } | |
197 | return ret; | |
198 | } | |
199 | ||
200 | const struct file_operations proc_net_operations = { | |
b4df2b92 | 201 | .llseek = generic_file_llseek, |
e9720acd | 202 | .read = generic_read_dir, |
f50752ea | 203 | .iterate_shared = proc_tgid_net_readdir, |
e9720acd PE |
204 | }; |
205 | ||
4665079c | 206 | static __net_init int proc_net_ns_init(struct net *net) |
3c12afe7 | 207 | { |
e9720acd | 208 | struct proc_dir_entry *netd, *net_statd; |
c110486f DT |
209 | kuid_t uid; |
210 | kgid_t gid; | |
3c12afe7 DM |
211 | int err; |
212 | ||
213 | err = -ENOMEM; | |
b4884f23 | 214 | netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL); |
e9720acd | 215 | if (!netd) |
3c12afe7 DM |
216 | goto out; |
217 | ||
4f113437 | 218 | netd->subdir = RB_ROOT; |
e9720acd PE |
219 | netd->data = net; |
220 | netd->nlink = 2; | |
e9720acd PE |
221 | netd->namelen = 3; |
222 | netd->parent = &proc_root; | |
b4884f23 | 223 | netd->name = netd->inline_name; |
09570f91 | 224 | memcpy(netd->name, "net", 4); |
3c12afe7 | 225 | |
c110486f DT |
226 | uid = make_kuid(net->user_ns, 0); |
227 | if (!uid_valid(uid)) | |
228 | uid = netd->uid; | |
229 | ||
230 | gid = make_kgid(net->user_ns, 0); | |
231 | if (!gid_valid(gid)) | |
232 | gid = netd->gid; | |
233 | ||
234 | proc_set_user(netd, uid, gid); | |
235 | ||
3c12afe7 | 236 | err = -EEXIST; |
e5d69b9f | 237 | net_statd = proc_net_mkdir(net, "stat", netd); |
3c12afe7 DM |
238 | if (!net_statd) |
239 | goto free_net; | |
240 | ||
3c12afe7 DM |
241 | net->proc_net = netd; |
242 | net->proc_net_stat = net_statd; | |
e9720acd | 243 | return 0; |
3c12afe7 | 244 | |
e9720acd | 245 | free_net: |
b4884f23 | 246 | pde_free(netd); |
3c12afe7 DM |
247 | out: |
248 | return err; | |
3c12afe7 DM |
249 | } |
250 | ||
4665079c | 251 | static __net_exit void proc_net_ns_exit(struct net *net) |
3c12afe7 DM |
252 | { |
253 | remove_proc_entry("stat", net->proc_net); | |
b4884f23 | 254 | pde_free(net->proc_net); |
3c12afe7 DM |
255 | } |
256 | ||
022cbae6 | 257 | static struct pernet_operations __net_initdata proc_net_ns_ops = { |
3c12afe7 DM |
258 | .init = proc_net_ns_init, |
259 | .exit = proc_net_ns_exit, | |
260 | }; | |
261 | ||
4665079c | 262 | int __init proc_net_init(void) |
3c12afe7 | 263 | { |
155134fe | 264 | proc_symlink("net", NULL, "self/net"); |
3c12afe7 DM |
265 | |
266 | return register_pernet_subsys(&proc_net_ns_ops); | |
267 | } |