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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219/* SPDX-License-Identifier: GPL-2.0 */#ifndef __IPC_NAMESPACE_H__#define __IPC_NAMESPACE_H__
#include <linux/err.h>#include <linux/idr.h>#include <linux/rwsem.h>#include <linux/notifier.h>#include <linux/nsproxy.h>#include <linux/ns_common.h>#include <linux/refcount.h>#include <linux/rhashtable-types.h>#include <linux/sysctl.h>#include <linux/percpu_counter.h>
struct user_namespace;
struct ipc_ids { int in_use; unsigned short seq; struct rw_semaphore rwsem; struct idr ipcs_idr; int max_idx; int last_idx; /* For wrap around detection */#ifdef CONFIG_CHECKPOINT_RESTORE int next_id;#endif struct rhashtable key_ht;};
struct ipc_namespace { struct ipc_ids ids[3];
int sem_ctls[4]; int used_sems;
unsigned int msg_ctlmax; unsigned int msg_ctlmnb; unsigned int msg_ctlmni; struct percpu_counter percpu_msg_bytes; struct percpu_counter percpu_msg_hdrs;
size_t shm_ctlmax; size_t shm_ctlall; unsigned long shm_tot; int shm_ctlmni; /* * Defines whether IPC_RMID is forced for _all_ shm segments regardless * of shmctl() */ int shm_rmid_forced;
struct notifier_block ipcns_nb;
/* The kern_mount of the mqueuefs sb. We take a ref on it */ struct vfsmount *mq_mnt;
/* # queues in this ns, protected by mq_lock */ unsigned int mq_queues_count;
/* next fields are set through sysctl */ unsigned int mq_queues_max; /* initialized to DFLT_QUEUESMAX */ unsigned int mq_msg_max; /* initialized to DFLT_MSGMAX */ unsigned int mq_msgsize_max; /* initialized to DFLT_MSGSIZEMAX */ unsigned int mq_msg_default; unsigned int mq_msgsize_default;
struct ctl_table_set mq_set; struct ctl_table_header *mq_sysctls;
struct ctl_table_set ipc_set; struct ctl_table_header *ipc_sysctls;
/* user_ns which owns the ipc ns */ struct user_namespace *user_ns; struct ucounts *ucounts;
struct llist_node mnt_llist;
struct ns_common ns;} __randomize_layout;
extern struct ipc_namespace init_ipc_ns;extern spinlock_t mq_lock;
#ifdef CONFIG_SYSVIPCextern void shm_destroy_orphaned(struct ipc_namespace *ns);#else /* CONFIG_SYSVIPC */static inline void shm_destroy_orphaned(struct ipc_namespace *ns) {}#endif /* CONFIG_SYSVIPC */
#ifdef CONFIG_POSIX_MQUEUEextern int mq_init_ns(struct ipc_namespace *ns);/* * POSIX Message Queue default values: * * MIN_*: Lowest value an admin can set the maximum unprivileged limit to * DFLT_*MAX: Default values for the maximum unprivileged limits * DFLT_{MSG,MSGSIZE}: Default values used when the user doesn't supply * an attribute to the open call and the queue must be created * HARD_*: Highest value the maximums can be set to. These are enforced * on CAP_SYS_RESOURCE apps as well making them inviolate (so make them * suitably high) * * POSIX Requirements: * Per app minimum openable message queues - 8. This does not map well * to the fact that we limit the number of queues on a per namespace * basis instead of a per app basis. So, make the default high enough * that no given app should have a hard time opening 8 queues. * Minimum maximum for HARD_MSGMAX - 32767. I bumped this to 65536. * Minimum maximum for HARD_MSGSIZEMAX - POSIX is silent on this. However, * we have run into a situation where running applications in the wild * require this to be at least 5MB, and preferably 10MB, so I set the * value to 16MB in hopes that this user is the worst of the bunch and * the new maximum will handle anyone else. I may have to revisit this * in the future. */#define DFLT_QUEUESMAX 256#define MIN_MSGMAX 1#define DFLT_MSG 10U#define DFLT_MSGMAX 10#define HARD_MSGMAX 65536#define MIN_MSGSIZEMAX 128#define DFLT_MSGSIZE 8192U#define DFLT_MSGSIZEMAX 8192#define HARD_MSGSIZEMAX (16*1024*1024)#elsestatic inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }#endif
#if defined(CONFIG_IPC_NS)static inline struct ipc_namespace *to_ipc_ns(struct ns_common *ns){ return container_of(ns, struct ipc_namespace, ns);}
extern struct ipc_namespace *copy_ipcs(u64 flags, struct user_namespace *user_ns, struct ipc_namespace *ns);
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns){ if (ns) ns_ref_inc(ns); return ns;}
static inline struct ipc_namespace *get_ipc_ns_not_zero(struct ipc_namespace *ns){ if (ns) { if (ns_ref_get(ns)) return ns; }
return NULL;}
extern void put_ipc_ns(struct ipc_namespace *ns);#elsestatic inline struct ipc_namespace *copy_ipcs(u64 flags, struct user_namespace *user_ns, struct ipc_namespace *ns){ if (flags & CLONE_NEWIPC) return ERR_PTR(-EINVAL);
return ns;}
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns){ return ns;}
static inline struct ipc_namespace *get_ipc_ns_not_zero(struct ipc_namespace *ns){ return ns;}
static inline void put_ipc_ns(struct ipc_namespace *ns){}#endif
#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
void retire_mq_sysctls(struct ipc_namespace *ns);bool setup_mq_sysctls(struct ipc_namespace *ns);
#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
static inline void retire_mq_sysctls(struct ipc_namespace *ns){}
static inline bool setup_mq_sysctls(struct ipc_namespace *ns){ return true;}
#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
#ifdef CONFIG_SYSVIPC_SYSCTL
bool setup_ipc_sysctls(struct ipc_namespace *ns);void retire_ipc_sysctls(struct ipc_namespace *ns);
#else /* CONFIG_SYSVIPC_SYSCTL */
static inline void retire_ipc_sysctls(struct ipc_namespace *ns){}
static inline bool setup_ipc_sysctls(struct ipc_namespace *ns){ return true;}
#endif /* CONFIG_SYSVIPC_SYSCTL */#endif