2 * Copyright (C) 2006 IBM Corporation
4 * Author: Serge Hallyn <serue@us.ibm.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
11 * Jun 2006 - namespaces support
13 * Pavel Emelianov <xemul@openvz.org>
16 #include <linux/module.h>
17 #include <linux/version.h>
18 #include <linux/nsproxy.h>
19 #include <linux/init_task.h>
20 #include <linux/mnt_namespace.h>
21 #include <linux/utsname.h>
22 #include <linux/pid_namespace.h>
23 #include <net/net_namespace.h>
24 #include <linux/ipc_namespace.h>
26 static struct kmem_cache
*nsproxy_cachep
;
28 struct nsproxy init_nsproxy
= INIT_NSPROXY(init_nsproxy
);
31 * creates a copy of "orig" with refcount 1.
33 static inline struct nsproxy
*clone_nsproxy(struct nsproxy
*orig
)
37 ns
= kmem_cache_alloc(nsproxy_cachep
, GFP_KERNEL
);
39 memcpy(ns
, orig
, sizeof(struct nsproxy
));
40 atomic_set(&ns
->count
, 1);
46 * Create new nsproxy and all of its the associated namespaces.
47 * Return the newly created nsproxy. Do not attach this to the task,
48 * leave it to the caller to do proper locking and attach it to task.
50 static struct nsproxy
*create_new_namespaces(unsigned long flags
,
51 struct task_struct
*tsk
, struct fs_struct
*new_fs
)
53 struct nsproxy
*new_nsp
;
56 new_nsp
= clone_nsproxy(tsk
->nsproxy
);
58 return ERR_PTR(-ENOMEM
);
60 new_nsp
->mnt_ns
= copy_mnt_ns(flags
, tsk
->nsproxy
->mnt_ns
, new_fs
);
61 if (IS_ERR(new_nsp
->mnt_ns
)) {
62 err
= PTR_ERR(new_nsp
->mnt_ns
);
66 new_nsp
->uts_ns
= copy_utsname(flags
, tsk
->nsproxy
->uts_ns
);
67 if (IS_ERR(new_nsp
->uts_ns
)) {
68 err
= PTR_ERR(new_nsp
->uts_ns
);
72 new_nsp
->ipc_ns
= copy_ipcs(flags
, tsk
->nsproxy
->ipc_ns
);
73 if (IS_ERR(new_nsp
->ipc_ns
)) {
74 err
= PTR_ERR(new_nsp
->ipc_ns
);
78 new_nsp
->pid_ns
= copy_pid_ns(flags
, task_active_pid_ns(tsk
));
79 if (IS_ERR(new_nsp
->pid_ns
)) {
80 err
= PTR_ERR(new_nsp
->pid_ns
);
84 new_nsp
->user_ns
= copy_user_ns(flags
, tsk
->nsproxy
->user_ns
);
85 if (IS_ERR(new_nsp
->user_ns
)) {
86 err
= PTR_ERR(new_nsp
->user_ns
);
90 new_nsp
->net_ns
= copy_net_ns(flags
, tsk
->nsproxy
->net_ns
);
91 if (IS_ERR(new_nsp
->net_ns
)) {
92 err
= PTR_ERR(new_nsp
->net_ns
);
100 put_user_ns(new_nsp
->user_ns
);
103 put_pid_ns(new_nsp
->pid_ns
);
106 put_ipc_ns(new_nsp
->ipc_ns
);
109 put_uts_ns(new_nsp
->uts_ns
);
112 put_mnt_ns(new_nsp
->mnt_ns
);
114 kmem_cache_free(nsproxy_cachep
, new_nsp
);
119 * called from clone. This now handles copy for nsproxy and all
120 * namespaces therein.
122 int copy_namespaces(unsigned long flags
, struct task_struct
*tsk
)
124 struct nsproxy
*old_ns
= tsk
->nsproxy
;
125 struct nsproxy
*new_ns
;
133 if (!(flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
|
134 CLONE_NEWUSER
| CLONE_NEWPID
| CLONE_NEWNET
)))
137 if (!capable(CAP_SYS_ADMIN
)) {
142 new_ns
= create_new_namespaces(flags
, tsk
, tsk
->fs
);
143 if (IS_ERR(new_ns
)) {
144 err
= PTR_ERR(new_ns
);
148 err
= ns_cgroup_clone(tsk
);
154 tsk
->nsproxy
= new_ns
;
161 void free_nsproxy(struct nsproxy
*ns
)
164 put_mnt_ns(ns
->mnt_ns
);
166 put_uts_ns(ns
->uts_ns
);
168 put_ipc_ns(ns
->ipc_ns
);
170 put_pid_ns(ns
->pid_ns
);
172 put_user_ns(ns
->user_ns
);
174 kmem_cache_free(nsproxy_cachep
, ns
);
178 * Called from unshare. Unshare all the namespaces part of nsproxy.
179 * On success, returns the new nsproxy.
181 int unshare_nsproxy_namespaces(unsigned long unshare_flags
,
182 struct nsproxy
**new_nsp
, struct fs_struct
*new_fs
)
186 if (!(unshare_flags
& (CLONE_NEWNS
| CLONE_NEWUTS
| CLONE_NEWIPC
|
187 CLONE_NEWUSER
| CLONE_NEWNET
)))
190 if (!capable(CAP_SYS_ADMIN
))
193 *new_nsp
= create_new_namespaces(unshare_flags
, current
,
194 new_fs
? new_fs
: current
->fs
);
195 if (IS_ERR(*new_nsp
)) {
196 err
= PTR_ERR(*new_nsp
);
200 err
= ns_cgroup_clone(current
);
202 put_nsproxy(*new_nsp
);
208 void switch_task_namespaces(struct task_struct
*p
, struct nsproxy
*new)
216 rcu_assign_pointer(p
->nsproxy
, new);
218 if (ns
&& atomic_dec_and_test(&ns
->count
)) {
220 * wait for others to get what they want from this nsproxy.
222 * cannot release this nsproxy via the call_rcu() since
223 * put_mnt_ns() will want to sleep
230 void exit_task_namespaces(struct task_struct
*p
)
232 switch_task_namespaces(p
, NULL
);
235 static int __init
nsproxy_cache_init(void)
237 nsproxy_cachep
= KMEM_CACHE(nsproxy
, SLAB_PANIC
);
241 module_init(nsproxy_cache_init
);
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