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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/ipc_namespace.h
Initial import
Diffstat (limited to 'include/linux/ipc_namespace.h')
-rw-r--r--include/linux/ipc_namespace.h160
1 files changed, 160 insertions, 0 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
new file mode 100644
index 000000000..1eee6bcfc
--- /dev/null
+++ b/include/linux/ipc_namespace.h
@@ -0,0 +1,160 @@
+#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>
+
+struct user_namespace;
+
+struct ipc_ids {
+ int in_use;
+ unsigned short seq;
+ struct rw_semaphore rwsem;
+ struct idr ipcs_idr;
+ int next_id;
+};
+
+struct ipc_namespace {
+ atomic_t count;
+ struct ipc_ids ids[3];
+
+ int sem_ctls[4];
+ int used_sems;
+
+ unsigned int msg_ctlmax;
+ unsigned int msg_ctlmnb;
+ unsigned int msg_ctlmni;
+ atomic_t msg_bytes;
+ atomic_t 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;
+
+ /* user_ns which owns the ipc ns */
+ struct user_namespace *user_ns;
+
+ struct ns_common ns;
+};
+
+extern struct ipc_namespace init_ipc_ns;
+extern atomic_t nr_ipc_ns;
+
+extern spinlock_t mq_lock;
+
+#ifdef CONFIG_SYSVIPC
+extern 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_MQUEUE
+extern 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)
+#else
+static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
+#endif
+
+#if defined(CONFIG_IPC_NS)
+extern struct ipc_namespace *copy_ipcs(unsigned long flags,
+ struct user_namespace *user_ns, struct ipc_namespace *ns);
+
+static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
+{
+ if (ns)
+ atomic_inc(&ns->count);
+ return ns;
+}
+
+extern void put_ipc_ns(struct ipc_namespace *ns);
+#else
+static inline struct ipc_namespace *copy_ipcs(unsigned long 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 void put_ipc_ns(struct ipc_namespace *ns)
+{
+}
+#endif
+
+#ifdef CONFIG_POSIX_MQUEUE_SYSCTL
+
+struct ctl_table_header;
+extern struct ctl_table_header *mq_register_sysctl_table(void);
+
+#else /* CONFIG_POSIX_MQUEUE_SYSCTL */
+
+static inline struct ctl_table_header *mq_register_sysctl_table(void)
+{
+ return NULL;
+}
+
+#endif /* CONFIG_POSIX_MQUEUE_SYSCTL */
+#endif