Commit | Line | Data |
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ae5e1b22 PE |
1 | #ifndef __IPC_NAMESPACE_H__ |
2 | #define __IPC_NAMESPACE_H__ | |
3 | ||
4 | #include <linux/err.h> | |
ed2ddbf8 PP |
5 | #include <linux/idr.h> |
6 | #include <linux/rwsem.h> | |
b6b337ad | 7 | #include <linux/notifier.h> |
b0e77598 | 8 | #include <linux/nsproxy.h> |
435d5f4b | 9 | #include <linux/ns_common.h> |
b6b337ad | 10 | |
b515498f | 11 | struct user_namespace; |
ed2ddbf8 PP |
12 | |
13 | struct ipc_ids { | |
14 | int in_use; | |
15 | unsigned short seq; | |
d9a605e4 | 16 | struct rw_semaphore rwsem; |
ed2ddbf8 | 17 | struct idr ipcs_idr; |
03f59566 | 18 | int next_id; |
ed2ddbf8 | 19 | }; |
ae5e1b22 | 20 | |
ae5e1b22 | 21 | struct ipc_namespace { |
7eafd7c7 | 22 | atomic_t count; |
ed2ddbf8 | 23 | struct ipc_ids ids[3]; |
ae5e1b22 PE |
24 | |
25 | int sem_ctls[4]; | |
26 | int used_sems; | |
27 | ||
9bf76ca3 MK |
28 | unsigned int msg_ctlmax; |
29 | unsigned int msg_ctlmnb; | |
30 | unsigned int msg_ctlmni; | |
ae5e1b22 PE |
31 | atomic_t msg_bytes; |
32 | atomic_t msg_hdrs; | |
33 | ||
34 | size_t shm_ctlmax; | |
35 | size_t shm_ctlall; | |
d69f3bad | 36 | unsigned long shm_tot; |
ae5e1b22 | 37 | int shm_ctlmni; |
b34a6b1d VK |
38 | /* |
39 | * Defines whether IPC_RMID is forced for _all_ shm segments regardless | |
40 | * of shmctl() | |
41 | */ | |
42 | int shm_rmid_forced; | |
b6b337ad | 43 | |
b6b337ad | 44 | struct notifier_block ipcns_nb; |
614b84cf SH |
45 | |
46 | /* The kern_mount of the mqueuefs sb. We take a ref on it */ | |
47 | struct vfsmount *mq_mnt; | |
48 | ||
49 | /* # queues in this ns, protected by mq_lock */ | |
50 | unsigned int mq_queues_count; | |
51 | ||
52 | /* next fields are set through sysctl */ | |
53 | unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ | |
54 | unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ | |
55 | unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ | |
cef0184c KM |
56 | unsigned int mq_msg_default; |
57 | unsigned int mq_msgsize_default; | |
614b84cf | 58 | |
b515498f SH |
59 | /* user_ns which owns the ipc ns */ |
60 | struct user_namespace *user_ns; | |
98f842e6 | 61 | |
435d5f4b | 62 | struct ns_common ns; |
ae5e1b22 PE |
63 | }; |
64 | ||
65 | extern struct ipc_namespace init_ipc_ns; | |
4d89dc6a | 66 | extern atomic_t nr_ipc_ns; |
ae5e1b22 | 67 | |
7eafd7c7 | 68 | extern spinlock_t mq_lock; |
b6b337ad | 69 | |
614b84cf | 70 | #ifdef CONFIG_SYSVIPC |
b34a6b1d | 71 | extern void shm_destroy_orphaned(struct ipc_namespace *ns); |
b6b337ad | 72 | #else /* CONFIG_SYSVIPC */ |
b34a6b1d | 73 | static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} |
b6b337ad | 74 | #endif /* CONFIG_SYSVIPC */ |
ae5e1b22 | 75 | |
614b84cf | 76 | #ifdef CONFIG_POSIX_MQUEUE |
7eafd7c7 | 77 | extern int mq_init_ns(struct ipc_namespace *ns); |
5b5c4d1a DL |
78 | /* |
79 | * POSIX Message Queue default values: | |
80 | * | |
81 | * MIN_*: Lowest value an admin can set the maximum unprivileged limit to | |
82 | * DFLT_*MAX: Default values for the maximum unprivileged limits | |
83 | * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply | |
84 | * an attribute to the open call and the queue must be created | |
85 | * HARD_*: Highest value the maximums can be set to. These are enforced | |
86 | * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them | |
87 | * suitably high) | |
88 | * | |
89 | * POSIX Requirements: | |
90 | * Per app minimum openable message queues - 8. This does not map well | |
91 | * to the fact that we limit the number of queues on a per namespace | |
92 | * basis instead of a per app basis. So, make the default high enough | |
93 | * that no given app should have a hard time opening 8 queues. | |
94 | * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. | |
95 | * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, | |
96 | * we have run into a situation where running applications in the wild | |
97 | * require this to be at least 5MB, and preferably 10MB, so I set the | |
98 | * value to 16MB in hopes that this user is the worst of the bunch and | |
99 | * the new maximum will handle anyone else. I may have to revisit this | |
100 | * in the future. | |
101 | */ | |
5b5c4d1a | 102 | #define DFLT_QUEUESMAX 256 |
5b5c4d1a | 103 | #define MIN_MSGMAX 1 |
e6315bb1 KM |
104 | #define DFLT_MSG 10U |
105 | #define DFLT_MSGMAX 10 | |
5b5c4d1a DL |
106 | #define HARD_MSGMAX 65536 |
107 | #define MIN_MSGSIZEMAX 128 | |
108 | #define DFLT_MSGSIZE 8192U | |
e6315bb1 | 109 | #define DFLT_MSGSIZEMAX 8192 |
5b5c4d1a | 110 | #define HARD_MSGSIZEMAX (16*1024*1024) |
614b84cf | 111 | #else |
7eafd7c7 | 112 | static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } |
614b84cf SH |
113 | #endif |
114 | ||
115 | #if defined(CONFIG_IPC_NS) | |
ae5e1b22 | 116 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
bcf58e72 EB |
117 | struct user_namespace *user_ns, struct ipc_namespace *ns); |
118 | ||
ae5e1b22 PE |
119 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
120 | { | |
121 | if (ns) | |
7eafd7c7 | 122 | atomic_inc(&ns->count); |
ae5e1b22 PE |
123 | return ns; |
124 | } | |
125 | ||
7eafd7c7 | 126 | extern void put_ipc_ns(struct ipc_namespace *ns); |
ae5e1b22 PE |
127 | #else |
128 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, | |
bcf58e72 | 129 | struct user_namespace *user_ns, struct ipc_namespace *ns) |
ae5e1b22 PE |
130 | { |
131 | if (flags & CLONE_NEWIPC) | |
132 | return ERR_PTR(-EINVAL); | |
133 | ||
bcf58e72 | 134 | return ns; |
ae5e1b22 PE |
135 | } |
136 | ||
137 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) | |
138 | { | |
139 | return ns; | |
140 | } | |
141 | ||
142 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
143 | { | |
144 | } | |
145 | #endif | |
bdc8e5f8 SH |
146 | |
147 | #ifdef CONFIG_POSIX_MQUEUE_SYSCTL | |
148 | ||
149 | struct ctl_table_header; | |
150 | extern struct ctl_table_header *mq_register_sysctl_table(void); | |
151 | ||
152 | #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ | |
153 | ||
154 | static inline struct ctl_table_header *mq_register_sysctl_table(void) | |
155 | { | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ | |
ae5e1b22 | 160 | #endif |