~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/ipc_namespace.h

Version: ~ [ linux-5.2-rc4 ] ~ [ linux-5.1.9 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.50 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.125 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.181 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.181 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.68 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp