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1 | /* |
2 | * linux/ipc/util.h |
3 | * Copyright (C) 1999 Christoph Rohland |
4 | * |
5 | * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
6 | * namespaces support. 2006 OpenVZ, SWsoft Inc. |
7 | * Pavel Emelianov <xemul@openvz.org> |
8 | */ |
9 | |
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 | |
18 | void sem_init (void); |
19 | void msg_init (void); |
20 | void shm_init (void); |
21 | |
22 | struct ipc_namespace; |
23 | |
24 | #ifdef CONFIG_POSIX_MQUEUE |
25 | extern void mq_clear_sbinfo(struct ipc_namespace *ns); |
26 | extern void mq_put_mnt(struct ipc_namespace *ns); |
27 | #else |
28 | static inline void mq_clear_sbinfo(struct ipc_namespace *ns) { } |
29 | static inline void mq_put_mnt(struct ipc_namespace *ns) { } |
30 | #endif |
31 | |
32 | #ifdef CONFIG_SYSVIPC |
33 | void sem_init_ns(struct ipc_namespace *ns); |
34 | void msg_init_ns(struct ipc_namespace *ns); |
35 | void shm_init_ns(struct ipc_namespace *ns); |
36 | |
37 | void sem_exit_ns(struct ipc_namespace *ns); |
38 | void msg_exit_ns(struct ipc_namespace *ns); |
39 | void shm_exit_ns(struct ipc_namespace *ns); |
40 | #else |
41 | static inline void sem_init_ns(struct ipc_namespace *ns) { } |
42 | static inline void msg_init_ns(struct ipc_namespace *ns) { } |
43 | static inline void shm_init_ns(struct ipc_namespace *ns) { } |
44 | |
45 | static inline void sem_exit_ns(struct ipc_namespace *ns) { } |
46 | static inline void msg_exit_ns(struct ipc_namespace *ns) { } |
47 | static inline void shm_exit_ns(struct ipc_namespace *ns) { } |
48 | #endif |
49 | |
50 | /* |
51 | * Structure that holds the parameters needed by the ipc operations |
52 | * (see after) |
53 | */ |
54 | struct ipc_params { |
55 | key_t key; |
56 | int flg; |
57 | union { |
58 | size_t size; /* for shared memories */ |
59 | int nsems; /* for semaphores */ |
60 | } u; /* holds the getnew() specific param */ |
61 | }; |
62 | |
63 | /* |
64 | * Structure that holds some ipc operations. This structure is used to unify |
65 | * the calls to sys_msgget(), sys_semget(), sys_shmget() |
66 | * . routine to call to create a new ipc object. Can be one of newque, |
67 | * newary, newseg |
68 | * . routine to call to check permissions for a new ipc object. |
69 | * Can be one of security_msg_associate, security_sem_associate, |
70 | * security_shm_associate |
71 | * . routine to call for an extra check if needed |
72 | */ |
73 | struct ipc_ops { |
74 | int (*getnew) (struct ipc_namespace *, struct ipc_params *); |
75 | int (*associate) (struct kern_ipc_perm *, int); |
76 | int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *); |
77 | }; |
78 | |
79 | struct seq_file; |
80 | struct ipc_ids; |
81 | |
82 | void ipc_init_ids(struct ipc_ids *); |
83 | #ifdef CONFIG_PROC_FS |
84 | void __init ipc_init_proc_interface(const char *path, const char *header, |
85 | int ids, int (*show)(struct seq_file *, void *)); |
86 | #else |
87 | #define ipc_init_proc_interface(path, header, ids, show) do {} while (0) |
88 | #endif |
89 | |
90 | #define IPC_SEM_IDS 0 |
91 | #define IPC_MSG_IDS 1 |
92 | #define IPC_SHM_IDS 2 |
93 | |
94 | #define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER) |
95 | #define ipcid_to_seqx(id) ((id) / SEQ_MULTIPLIER) |
96 | |
97 | /* must be called with ids->rw_mutex acquired for writing */ |
98 | int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int); |
99 | |
100 | /* must be called with ids->rw_mutex acquired for reading */ |
101 | int ipc_get_maxid(struct ipc_ids *); |
102 | |
103 | /* must be called with both locks acquired. */ |
104 | void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *); |
105 | |
106 | /* must be called with ipcp locked */ |
107 | int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg); |
108 | |
109 | /* for rare, potentially huge allocations. |
110 | * both function can sleep |
111 | */ |
112 | void* ipc_alloc(int size); |
113 | void ipc_free(void* ptr, int size); |
114 | |
115 | /* |
116 | * For allocation that need to be freed by RCU. |
117 | * Objects are reference counted, they start with reference count 1. |
118 | * getref increases the refcount, the putref call that reduces the recount |
119 | * to 0 schedules the rcu destruction. Caller must guarantee locking. |
120 | */ |
121 | void* ipc_rcu_alloc(int size); |
122 | void ipc_rcu_getref(void *ptr); |
123 | void ipc_rcu_putref(void *ptr); |
124 | |
125 | struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int); |
126 | |
127 | void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); |
128 | void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); |
129 | int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out); |
130 | struct kern_ipc_perm *ipcctl_pre_down(struct ipc_namespace *ns, |
131 | struct ipc_ids *ids, int id, int cmd, |
132 | struct ipc64_perm *perm, int extra_perm); |
133 | |
134 | #ifndef CONFIG_ARCH_WANT_IPC_PARSE_VERSION |
135 | /* On IA-64, we always use the "64-bit version" of the IPC structures. */ |
136 | # define ipc_parse_version(cmd) IPC_64 |
137 | #else |
138 | int ipc_parse_version (int *cmd); |
139 | #endif |
140 | |
141 | extern void free_msg(struct msg_msg *msg); |
142 | extern struct msg_msg *load_msg(const void __user *src, int len); |
143 | extern struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst); |
144 | extern int store_msg(void __user *dest, struct msg_msg *msg, int len); |
145 | |
146 | extern void recompute_msgmni(struct ipc_namespace *); |
147 | |
148 | static inline int ipc_buildid(int id, int seq) |
149 | { |
150 | return SEQ_MULTIPLIER * seq + id; |
151 | } |
152 | |
153 | /* |
154 | * Must be called with ipcp locked |
155 | */ |
156 | static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) |
157 | { |
158 | if (uid / SEQ_MULTIPLIER != ipcp->seq) |
159 | return 1; |
160 | return 0; |
161 | } |
162 | |
163 | static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) |
164 | { |
165 | rcu_read_lock(); |
166 | spin_lock(&perm->lock); |
167 | } |
168 | |
169 | static inline void ipc_unlock(struct kern_ipc_perm *perm) |
170 | { |
171 | spin_unlock(&perm->lock); |
172 | rcu_read_unlock(); |
173 | } |
174 | |
175 | struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id); |
176 | int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, |
177 | struct ipc_ops *ops, struct ipc_params *params); |
178 | void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids, |
179 | void (*free)(struct ipc_namespace *, struct kern_ipc_perm *)); |
180 | #endif |
181 |
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