Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef __IPC_NAMESPACE_H__
2#define __IPC_NAMESPACE_H__
3
4#include <linux/err.h>
5#include <linux/idr.h>
6#include <linux/rwsem.h>
7#include <linux/notifier.h>
8#include <linux/nsproxy.h>
9
10/*
11 * ipc namespace events
12 */
13#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
14#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
15#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
16
17#define IPCNS_CALLBACK_PRI 0
18
19struct user_namespace;
20
21struct ipc_ids {
22 int in_use;
23 unsigned short seq;
24 struct rw_semaphore rwsem;
25 struct idr ipcs_idr;
26 int next_id;
27};
28
29struct ipc_namespace {
30 atomic_t count;
31 struct ipc_ids ids[3];
32
33 int sem_ctls[4];
34 int used_sems;
35
36 unsigned int msg_ctlmax;
37 unsigned int msg_ctlmnb;
38 unsigned int msg_ctlmni;
39 atomic_t msg_bytes;
40 atomic_t msg_hdrs;
41 int auto_msgmni;
42
43 size_t shm_ctlmax;
44 size_t shm_ctlall;
45 unsigned long shm_tot;
46 int shm_ctlmni;
47 /*
48 * Defines whether IPC_RMID is forced for _all_ shm segments regardless
49 * of shmctl()
50 */
51 int shm_rmid_forced;
52
53 struct notifier_block ipcns_nb;
54
55 /* The kern_mount of the mqueuefs sb. We take a ref on it */
56 struct vfsmount *mq_mnt;
57
58 /* # queues in this ns, protected by mq_lock */
59 unsigned int mq_queues_count;
60
61 /* next fields are set through sysctl */
62 unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */
63 unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */
64 unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */
65 unsigned int mq_msg_default;
66 unsigned int mq_msgsize_default;
67
68 /* user_ns which owns the ipc ns */
69 struct user_namespace *user_ns;
70
71 unsigned int proc_inum;
72};
73
74extern struct ipc_namespace init_ipc_ns;
75extern atomic_t nr_ipc_ns;
76
77extern spinlock_t mq_lock;
78
79#ifdef CONFIG_SYSVIPC
80extern int register_ipcns_notifier(struct ipc_namespace *);
81extern int cond_register_ipcns_notifier(struct ipc_namespace *);
82extern void unregister_ipcns_notifier(struct ipc_namespace *);
83extern int ipcns_notify(unsigned long);
84extern void shm_destroy_orphaned(struct ipc_namespace *ns);
85#else /* CONFIG_SYSVIPC */
86static inline int register_ipcns_notifier(struct ipc_namespace *ns)
87{ return 0; }
88static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns)
89{ return 0; }
90static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { }
91static inline int ipcns_notify(unsigned long l) { return 0; }
92static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}
93#endif /* CONFIG_SYSVIPC */
94
95#ifdef CONFIG_POSIX_MQUEUE
96extern int mq_init_ns(struct ipc_namespace *ns);
97/*
98 * POSIX Message Queue default values:
99 *
100 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to
101 * DFLT_*MAX: Default values for the maximum unprivileged limits
102 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply
103 * an attribute to the open call and the queue must be created
104 * HARD_*: Highest value the maximums can be set to. These are enforced
105 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them
106 * suitably high)
107 *
108 * POSIX Requirements:
109 * Per app minimum openable message queues - 8. This does not map well
110 * to the fact that we limit the number of queues on a per namespace
111 * basis instead of a per app basis. So, make the default high enough
112 * that no given app should have a hard time opening 8 queues.
113 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536.
114 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However,
115 * we have run into a situation where running applications in the wild
116 * require this to be at least 5MB, and preferably 10MB, so I set the
117 * value to 16MB in hopes that this user is the worst of the bunch and
118 * the new maximum will handle anyone else. I may have to revisit this
119 * in the future.
120 */
121#define DFLT_QUEUESMAX 256
122#define MIN_MSGMAX 1
123#define DFLT_MSG 10U
124#define DFLT_MSGMAX 10
125#define HARD_MSGMAX 65536
126#define MIN_MSGSIZEMAX 128
127#define DFLT_MSGSIZE 8192U
128#define DFLT_MSGSIZEMAX 8192
129#define HARD_MSGSIZEMAX (16*1024*1024)
130#else
131static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
132#endif
133
134#if defined(CONFIG_IPC_NS)
135extern struct ipc_namespace *copy_ipcs(unsigned long flags,
136 struct user_namespace *user_ns, struct ipc_namespace *ns);
137
138static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
139{
140 if (ns)
141 atomic_inc(&ns->count);
142 return ns;
143}
144
145extern void put_ipc_ns(struct ipc_namespace *ns);
146#else
147static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
148 struct user_namespace *user_ns, struct ipc_namespace *ns)
149{
150 if (flags & CLONE_NEWIPC)
151 return ERR_PTR(-EINVAL);
152
153 return ns;
154}
155
156static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
157{
158 return ns;
159}
160
161static inline void put_ipc_ns(struct ipc_namespace *ns)
162{
163}
164#endif
165
166#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
167
168struct ctl_table_header;
169extern struct ctl_table_header *mq_register_sysctl_table(void);
170
171#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
172
173static inline struct ctl_table_header *mq_register_sysctl_table(void)
174{
175 return NULL;
176}
177
178#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
179#endif