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