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10#ifndef _IPC_UTIL_H
11#define _IPC_UTIL_H
12
13#include <linux/unistd.h>
14#include <linux/err.h>
15
16#define SEQ_MULTIPLIER (IPCMNI)
17
18void sem_init (void);
19void msg_init (void);
20void shm_init (void);
21
22struct ipc_namespace;
23
24#ifdef CONFIG_POSIX_MQUEUE
25extern void mq_clear_sbinfo(struct ipc_namespace *ns);
26extern void mq_put_mnt(struct ipc_namespace *ns);
27#else
28static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { }
29static inline void mq_put_mnt(struct ipc_namespace *ns) { }
30#endif
31
32#ifdef CONFIG_SYSVIPC
33void sem_init_ns(struct ipc_namespace *ns);
34void msg_init_ns(struct ipc_namespace *ns);
35void shm_init_ns(struct ipc_namespace *ns);
36
37void sem_exit_ns(struct ipc_namespace *ns);
38void msg_exit_ns(struct ipc_namespace *ns);
39void shm_exit_ns(struct ipc_namespace *ns);
40#else
41static inline void sem_init_ns(struct ipc_namespace *ns) { }
42static inline void msg_init_ns(struct ipc_namespace *ns) { }
43static inline void shm_init_ns(struct ipc_namespace *ns) { }
44
45static inline void sem_exit_ns(struct ipc_namespace *ns) { }
46static inline void msg_exit_ns(struct ipc_namespace *ns) { }
47static inline void shm_exit_ns(struct ipc_namespace *ns) { }
48#endif
49
50struct ipc_rcu {
51 struct rcu_head rcu;
52 atomic_t refcount;
53} ____cacheline_aligned_in_smp;
54
55#define ipc_rcu_to_struct(p) ((void *)(p+1))
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60
61struct ipc_params {
62 key_t key;
63 int flg;
64 union {
65 size_t size;
66 int nsems;
67 } u;
68};
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79
80struct ipc_ops {
81 int (*getnew) (struct ipc_namespace *, struct ipc_params *);
82 int (*associate) (struct kern_ipc_perm *, int);
83 int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *);
84};
85
86struct seq_file;
87struct ipc_ids;
88
89void ipc_init_ids(struct ipc_ids *);
90#ifdef CONFIG_PROC_FS
91void __init ipc_init_proc_interface(const char *path, const char *header,
92 int ids, int (*show)(struct seq_file *, void *));
93#else
94#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
95#endif
96
97#define IPC_SEM_IDS 0
98#define IPC_MSG_IDS 1
99#define IPC_SHM_IDS 2
100
101#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER)
102#define ipcid_to_seqx(id) ((id) / SEQ_MULTIPLIER)
103
104
105int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
106
107
108int ipc_get_maxid(struct ipc_ids *);
109
110
111void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
112
113
114int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg);
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118
119void* ipc_alloc(int size);
120void ipc_free(void* ptr, int size);
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127
128void* ipc_rcu_alloc(int size);
129int ipc_rcu_getref(void *ptr);
130void ipc_rcu_putref(void *ptr, void (*func)(struct rcu_head *head));
131void ipc_rcu_free(struct rcu_head *head);
132
133struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int);
134struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id);
135
136void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
137void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
138int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out);
139struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
140 struct ipc_ids *ids, int id, int cmd,
141 struct ipc64_perm *perm, int extra_perm);
142
143#ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION
144
145# define ipc_parse_version(cmd) IPC_64
146#else
147int ipc_parse_version (int *cmd);
148#endif
149
150extern void free_msg(struct msg_msg *msg);
151extern struct msg_msg *load_msg(const void __user *src, int len);
152extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst);
153extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
154
155extern void recompute_msgmni(struct ipc_namespace *);
156
157static inline int ipc_buildid(int id, int seq)
158{
159 return SEQ_MULTIPLIER * seq + id;
160}
161
162static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
163{
164 return uid / SEQ_MULTIPLIER != ipcp->seq;
165}
166
167static inline void ipc_lock_object(struct kern_ipc_perm *perm)
168{
169 spin_lock(&perm->lock);
170}
171
172static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
173{
174 spin_unlock(&perm->lock);
175}
176
177static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
178{
179 assert_spin_locked(&perm->lock);
180}
181
182static inline void ipc_unlock(struct kern_ipc_perm *perm)
183{
184 ipc_unlock_object(perm);
185 rcu_read_unlock();
186}
187
188struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
189int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
190 struct ipc_ops *ops, struct ipc_params *params);
191void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
192 void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
193#endif
194