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 rwsem; 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 unsigned int msg_ctlmax; 38 unsigned int msg_ctlmnb; 39 unsigned 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 RH_KABI_EXTEND(struct ucounts *ucounts) 74}; 75 76extern struct ipc_namespace init_ipc_ns; 77extern atomic_t nr_ipc_ns; 78 79extern spinlock_t mq_lock; 80 81#ifdef CONFIG_SYSVIPC 82extern int register_ipcns_notifier(struct ipc_namespace *); 83extern int cond_register_ipcns_notifier(struct ipc_namespace *); 84extern void unregister_ipcns_notifier(struct ipc_namespace *); 85extern int ipcns_notify(unsigned long); 86extern void shm_destroy_orphaned(struct ipc_namespace *ns); 87#else /* CONFIG_SYSVIPC */ 88static inline int register_ipcns_notifier(struct ipc_namespace *ns) 89{ return 0; } 90static inline int cond_register_ipcns_notifier(struct ipc_namespace *ns) 91{ return 0; } 92static inline void unregister_ipcns_notifier(struct ipc_namespace *ns) { } 93static inline int ipcns_notify(unsigned long l) { return 0; } 94static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {} 95#endif /* CONFIG_SYSVIPC */ 96 97#ifdef CONFIG_POSIX_MQUEUE 98extern int mq_init_ns(struct ipc_namespace *ns); 99/* 100 * POSIX Message Queue default values: 101 * 102 * MIN_*: Lowest value an admin can set the maximum unprivileged limit to 103 * DFLT_*MAX: Default values for the maximum unprivileged limits 104 * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply 105 * an attribute to the open call and the queue must be created 106 * HARD_*: Highest value the maximums can be set to. These are enforced 107 * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them 108 * suitably high) 109 * 110 * POSIX Requirements: 111 * Per app minimum openable message queues - 8. This does not map well 112 * to the fact that we limit the number of queues on a per namespace 113 * basis instead of a per app basis. So, make the default high enough 114 * that no given app should have a hard time opening 8 queues. 115 * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. 116 * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, 117 * we have run into a situation where running applications in the wild 118 * require this to be at least 5MB, and preferably 10MB, so I set the 119 * value to 16MB in hopes that this user is the worst of the bunch and 120 * the new maximum will handle anyone else. I may have to revisit this 121 * in the future. 122 */ 123#define DFLT_QUEUESMAX 256 124#define MIN_MSGMAX 1 125#define DFLT_MSG 10U 126#define DFLT_MSGMAX 10 127#define HARD_MSGMAX 65536 128#define MIN_MSGSIZEMAX 128 129#define DFLT_MSGSIZE 8192U 130#define DFLT_MSGSIZEMAX 8192 131#define HARD_MSGSIZEMAX (16*1024*1024) 132#else 133static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; } 134#endif 135 136#if defined(CONFIG_IPC_NS) 137extern struct ipc_namespace *copy_ipcs(unsigned long flags, 138 struct user_namespace *user_ns, struct ipc_namespace *ns); 139 140static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 141{ 142 if (ns) 143 atomic_inc(&ns->count); 144 return ns; 145} 146 147extern void put_ipc_ns(struct ipc_namespace *ns); 148#else 149static inline struct ipc_namespace *copy_ipcs(unsigned long flags, 150 struct user_namespace *user_ns, struct ipc_namespace *ns) 151{ 152 if (flags & CLONE_NEWIPC) 153 return ERR_PTR(-EINVAL); 154 155 return ns; 156} 157 158static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) 159{ 160 return ns; 161} 162 163static inline void put_ipc_ns(struct ipc_namespace *ns) 164{ 165} 166#endif 167 168#ifdef CONFIG_POSIX_MQUEUE_SYSCTL 169 170struct ctl_table_header; 171extern struct ctl_table_header *mq_register_sysctl_table(void); 172 173#else /* CONFIG_POSIX_MQUEUE_SYSCTL */ 174 175static inline struct ctl_table_header *mq_register_sysctl_table(void) 176{ 177 return NULL; 178} 179 180#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */ 181#endif 182