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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 | |
19 | struct user_namespace; |
20 | |
21 | struct ipc_ids { |
22 | int in_use; |
23 | unsigned short seq; |
24 | unsigned short seq_max; |
25 | struct rw_semaphore rw_mutex; |
26 | struct idr ipcs_idr; |
27 | int next_id; |
28 | }; |
29 | |
30 | struct ipc_namespace { |
31 | atomic_t count; |
32 | struct ipc_ids ids[3]; |
33 | |
34 | int sem_ctls[4]; |
35 | int used_sems; |
36 | |
37 | int msg_ctlmax; |
38 | int msg_ctlmnb; |
39 | int msg_ctlmni; |
40 | atomic_t msg_bytes; |
41 | atomic_t msg_hdrs; |
42 | int auto_msgmni; |
43 | |
44 | size_t shm_ctlmax; |
45 | size_t shm_ctlall; |
46 | unsigned long shm_tot; |
47 | int shm_ctlmni; |
48 | /* |
49 | * Defines whether IPC_RMID is forced for _all_ shm segments regardless |
50 | * of shmctl() |
51 | */ |
52 | int shm_rmid_forced; |
53 | |
54 | struct notifier_block ipcns_nb; |
55 | |
56 | /* The kern_mount of the mqueuefs sb. We take a ref on it */ |
57 | struct vfsmount *mq_mnt; |
58 | |
59 | /* # queues in this ns, protected by mq_lock */ |
60 | unsigned int mq_queues_count; |
61 | |
62 | /* next fields are set through sysctl */ |
63 | unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ |
64 | unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ |
65 | unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ |
66 | unsigned int mq_msg_default; |
67 | unsigned int mq_msgsize_default; |
68 | |
69 | /* user_ns which owns the ipc ns */ |
70 | struct user_namespace *user_ns; |
71 | |
72 | unsigned int proc_inum; |
73 | }; |
74 | |
75 | extern struct ipc_namespace init_ipc_ns; |
76 | extern atomic_t nr_ipc_ns; |
77 | |
78 | extern spinlock_t mq_lock; |
79 | |
80 | #ifdef CONFIG_SYSVIPC |
81 | extern int register_ipcns_notifier(struct ipc_namespace *); |
82 | extern int cond_register_ipcns_notifier(struct ipc_namespace *); |
83 | extern void unregister_ipcns_notifier(struct ipc_namespace *); |
84 | extern int ipcns_notify(unsigned long); |
85 | extern void shm_destroy_orphaned(struct ipc_namespace *ns); |
86 | #else /* CONFIG_SYSVIPC */ |
87 | static inline int register_ipcns_notifier(struct ipc_namespace *ns) |
88 | { return 0; } |
89 | static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) |
90 | { return 0; } |
91 | static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } |
92 | static inline int ipcns_notify(unsigned long l) { return 0; } |
93 | static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} |
94 | #endif /* CONFIG_SYSVIPC */ |
95 | |
96 | #ifdef CONFIG_POSIX_MQUEUE |
97 | extern int mq_init_ns(struct ipc_namespace *ns); |
98 | /* |
99 | * POSIX Message Queue default values: |
100 | * |
101 | * MIN_*: Lowest value an admin can set the maximum unprivileged limit to |
102 | * DFLT_*MAX: Default values for the maximum unprivileged limits |
103 | * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply |
104 | * an attribute to the open call and the queue must be created |
105 | * HARD_*: Highest value the maximums can be set to. These are enforced |
106 | * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them |
107 | * suitably high) |
108 | * |
109 | * POSIX Requirements: |
110 | * Per app minimum openable message queues - 8. This does not map well |
111 | * to the fact that we limit the number of queues on a per namespace |
112 | * basis instead of a per app basis. So, make the default high enough |
113 | * that no given app should have a hard time opening 8 queues. |
114 | * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. |
115 | * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, |
116 | * we have run into a situation where running applications in the wild |
117 | * require this to be at least 5MB, and preferably 10MB, so I set the |
118 | * value to 16MB in hopes that this user is the worst of the bunch and |
119 | * the new maximum will handle anyone else. I may have to revisit this |
120 | * in the future. |
121 | */ |
122 | #define MIN_QUEUESMAX 1 |
123 | #define DFLT_QUEUESMAX 256 |
124 | #define HARD_QUEUESMAX 1024 |
125 | #define MIN_MSGMAX 1 |
126 | #define DFLT_MSG 10U |
127 | #define DFLT_MSGMAX 10 |
128 | #define HARD_MSGMAX 65536 |
129 | #define MIN_MSGSIZEMAX 128 |
130 | #define DFLT_MSGSIZE 8192U |
131 | #define DFLT_MSGSIZEMAX 8192 |
132 | #define HARD_MSGSIZEMAX (16*1024*1024) |
133 | #else |
134 | static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } |
135 | #endif |
136 | |
137 | #if defined(CONFIG_IPC_NS) |
138 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
139 | struct user_namespace *user_ns, struct ipc_namespace *ns); |
140 | |
141 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
142 | { |
143 | if (ns) |
144 | atomic_inc(&ns->count); |
145 | return ns; |
146 | } |
147 | |
148 | extern void put_ipc_ns(struct ipc_namespace *ns); |
149 | #else |
150 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, |
151 | struct user_namespace *user_ns, struct ipc_namespace *ns) |
152 | { |
153 | if (flags & CLONE_NEWIPC) |
154 | return ERR_PTR(-EINVAL); |
155 | |
156 | return ns; |
157 | } |
158 | |
159 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
160 | { |
161 | return ns; |
162 | } |
163 | |
164 | static inline void put_ipc_ns(struct ipc_namespace *ns) |
165 | { |
166 | } |
167 | #endif |
168 | |
169 | #ifdef CONFIG_POSIX_MQUEUE_SYSCTL |
170 | |
171 | struct ctl_table_header; |
172 | extern struct ctl_table_header *mq_register_sysctl_table(void); |
173 | |
174 | #else /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
175 | |
176 | static inline struct ctl_table_header *mq_register_sysctl_table(void) |
177 | { |
178 | return NULL; |
179 | } |
180 | |
181 | #endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ |
182 | #endif |
183 |
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