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 unsigned short seq_max; 25 struct rw_semaphore rw_mutex; 26 struct idr ipcs_idr; 27 int next_id; 28}; 29 30struct 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 75extern struct ipc_namespace init_ipc_ns; 76extern atomic_t nr_ipc_ns; 77 78extern spinlock_t mq_lock; 79 80#ifdef CONFIG_SYSVIPC 81extern int register_ipcns_notifier(struct ipc_namespace *); 82extern int cond_register_ipcns_notifier(struct ipc_namespace *); 83extern void unregister_ipcns_notifier(struct ipc_namespace *); 84extern int ipcns_notify(unsigned long); 85extern void shm_destroy_orphaned(struct ipc_namespace *ns); 86#else /* CONFIG_SYSVIPC */ 87static inline int register_ipcns_notifier(struct ipc_namespace *ns) 88{ return 0; } 89static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) 90{ return 0; } 91static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } 92static inline int ipcns_notify(unsigned long l) { return 0; } 93static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} 94#endif /* CONFIG_SYSVIPC */ 95 96#ifdef CONFIG_POSIX_MQUEUE 97extern 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 134static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 135#endif 136 137#if defined(CONFIG_IPC_NS) 138extern struct ipc_namespace *copy_ipcs(unsigned long flags, 139 struct user_namespace *user_ns, struct ipc_namespace *ns); 140 141static 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 148extern void put_ipc_ns(struct ipc_namespace *ns); 149#else 150static 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 159static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 160{ 161 return ns; 162} 163 164static inline void put_ipc_ns(struct ipc_namespace *ns) 165{ 166} 167#endif 168 169#ifdef CONFIG_POSIX_MQUEUE_SYSCTL 170 171struct ctl_table_header; 172extern struct ctl_table_header *mq_register_sysctl_table(void); 173 174#else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 175 176static 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