[PATCH] sysctl: move SYSV IPC sysctls to their own file

[cascardo/linux.git] / ipc / ipc_sysctl.c

diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
new file mode 100644 (file)
index 0000000..2c17d83
--- /dev/null
+++ b/ipc/ipc_sysctl.c
@@ -0,0 +1,183 @@
+/*
+ *  Copyright (C) 2007
+ *
+ *  Author: Eric Biederman <ebiederm@xmision.com>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation, version 2 of the
+ *  License.
+ */
+
+#include <linux/module.h>
+#include <linux/ipc.h>
+#include <linux/nsproxy.h>
+#include <linux/sysctl.h>
+#include <linux/uaccess.h>
+
+#ifdef CONFIG_IPC_NS
+static void *get_ipc(ctl_table *table)
+{
+       char *which = table->data;
+       struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
+       which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
+       return which;
+}
+#else
+#define get_ipc(T) ((T)->data)
+#endif
+
+#ifdef CONFIG_PROC_FS
+static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
+       void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct ctl_table ipc_table;
+       memcpy(&ipc_table, table, sizeof(ipc_table));
+       ipc_table.data = get_ipc(table);
+
+       return proc_dointvec(&ipc_table, write, filp, buffer, lenp, ppos);
+}
+
+static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
+       struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct ctl_table ipc_table;
+       memcpy(&ipc_table, table, sizeof(ipc_table));
+       ipc_table.data = get_ipc(table);
+
+       return proc_doulongvec_minmax(&ipc_table, write, filp, buffer,
+                                       lenp, ppos);
+}
+
+#else
+#define proc_ipc_doulongvec_minmax NULL
+#define proc_ipc_dointvec         NULL
+#endif
+
+#ifdef CONFIG_SYSCTL_SYSCALL
+/* The generic sysctl ipc data routine. */
+static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
+               void __user *oldval, size_t __user *oldlenp,
+               void __user *newval, size_t newlen)
+{
+       size_t len;
+       void *data;
+
+       /* Get out of I don't have a variable */
+       if (!table->data || !table->maxlen)
+               return -ENOTDIR;
+
+       data = get_ipc(table);
+       if (!data)
+               return -ENOTDIR;
+
+       if (oldval && oldlenp) {
+               if (get_user(len, oldlenp))
+                       return -EFAULT;
+               if (len) {
+                       if (len > table->maxlen)
+                               len = table->maxlen;
+                       if (copy_to_user(oldval, data, len))
+                               return -EFAULT;
+                       if (put_user(len, oldlenp))
+                               return -EFAULT;
+               }
+       }
+
+       if (newval && newlen) {
+               if (newlen > table->maxlen)
+                       newlen = table->maxlen;
+
+               if (copy_from_user(data, newval, newlen))
+                       return -EFAULT;
+       }
+       return 1;
+}
+#else
+#define sysctl_ipc_data NULL
+#endif
+
+static struct ctl_table ipc_kern_table[] = {
+       {
+               .ctl_name       = KERN_SHMMAX,
+               .procname       = "shmmax",
+               .data           = &init_ipc_ns.shm_ctlmax,
+               .maxlen         = sizeof (init_ipc_ns.shm_ctlmax),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_doulongvec_minmax,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_SHMALL,
+               .procname       = "shmall",
+               .data           = &init_ipc_ns.shm_ctlall,
+               .maxlen         = sizeof (init_ipc_ns.shm_ctlall),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_doulongvec_minmax,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_SHMMNI,
+               .procname       = "shmmni",
+               .data           = &init_ipc_ns.shm_ctlmni,
+               .maxlen         = sizeof (init_ipc_ns.shm_ctlmni),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_dointvec,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_MSGMAX,
+               .procname       = "msgmax",
+               .data           = &init_ipc_ns.msg_ctlmax,
+               .maxlen         = sizeof (init_ipc_ns.msg_ctlmax),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_dointvec,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_MSGMNI,
+               .procname       = "msgmni",
+               .data           = &init_ipc_ns.msg_ctlmni,
+               .maxlen         = sizeof (init_ipc_ns.msg_ctlmni),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_dointvec,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_MSGMNB,
+               .procname       =  "msgmnb",
+               .data           = &init_ipc_ns.msg_ctlmnb,
+               .maxlen         = sizeof (init_ipc_ns.msg_ctlmnb),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_dointvec,
+               .strategy       = sysctl_ipc_data,
+       },
+       {
+               .ctl_name       = KERN_SEM,
+               .procname       = "sem",
+               .data           = &init_ipc_ns.sem_ctls,
+               .maxlen         = 4*sizeof (int),
+               .mode           = 0644,
+               .proc_handler   = proc_ipc_dointvec,
+               .strategy       = sysctl_ipc_data,
+       },
+       {}
+};
+
+static struct ctl_table ipc_root_table[] = {
+       {
+               .ctl_name       = CTL_KERN,
+               .procname       = "kernel",
+               .mode           = 0555,
+               .child          = ipc_kern_table,
+       },
+       {}
+};
+
+static int __init ipc_sysctl_init(void)
+{
+       register_sysctl_table(ipc_root_table, 0);
+       return 0;
+}
+
+__initcall(ipc_sysctl_init);