/* * sysctl.c: General linux system control interface * * Begun 24 March 1995, Stephen Tweedie * Added /proc support, Dec 1995 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas. * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver. * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver. * Dynamic registration fixes, Stephen Tweedie. * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn. * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris * Horn. * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer. * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer. * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill * Wendling. * The list_for_each() macro wasn't appropriate for the sysctl loop. * Removed it and replaced it with older style, 03/23/00, Bill Wendling */ #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ROOT_NFS #include #endif #if defined(CONFIG_SYSCTL) /* External variables not in a header file. */ extern int panic_timeout; extern int C_A_D; extern int bdf_prm[], bdflush_min[], bdflush_max[]; extern int sysctl_overcommit_memory; extern int max_threads; extern atomic_t nr_queued_signals; extern int max_queued_signals; extern int sysrq_enabled; extern int core_uses_pid; extern int cad_pid; /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */ static int maxolduid = 65535; static int minolduid; #ifdef CONFIG_KMOD extern char modprobe_path[]; #endif #ifdef CONFIG_HOTPLUG extern char hotplug_path[]; #endif #ifdef CONFIG_CHR_DEV_SG extern int sg_big_buff; #endif #ifdef CONFIG_SYSVIPC extern size_t shm_ctlmax; extern size_t shm_ctlall; extern int shm_ctlmni; extern int msg_ctlmax; extern int msg_ctlmnb; extern int msg_ctlmni; extern int sem_ctls[]; #endif #ifdef __sparc__ extern char reboot_command []; extern int stop_a_enabled; #endif #ifdef CONFIG_ARCH_S390 #ifdef CONFIG_MATHEMU extern int sysctl_ieee_emulation_warnings; #endif extern int sysctl_userprocess_debug; #endif #ifdef CONFIG_PPC32 extern unsigned long zero_paged_on, powersave_nap; int proc_dol2crvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp); #endif #ifdef CONFIG_BSD_PROCESS_ACCT extern int acct_parm[]; #endif extern int pgt_cache_water[]; static int parse_table(int *, int, void *, size_t *, void *, size_t, ctl_table *, void **); static int proc_doutsstring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp); static ctl_table root_table[]; static struct ctl_table_header root_table_header = { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) }; static ctl_table kern_table[]; static ctl_table vm_table[]; #ifdef CONFIG_NET extern ctl_table net_table[]; #endif static ctl_table proc_table[]; static ctl_table fs_table[]; static ctl_table debug_table[]; static ctl_table dev_table[]; extern ctl_table random_table[]; /* /proc declarations: */ #ifdef CONFIG_PROC_FS static ssize_t proc_readsys(struct file *, char *, size_t, loff_t *); static ssize_t proc_writesys(struct file *, const char *, size_t, loff_t *); static int proc_sys_permission(struct inode *, int); struct file_operations proc_sys_file_operations = { read: proc_readsys, write: proc_writesys, }; static struct inode_operations proc_sys_inode_operations = { permission: proc_sys_permission, }; extern struct proc_dir_entry *proc_sys_root; static void register_proc_table(ctl_table *, struct proc_dir_entry *); static void unregister_proc_table(ctl_table *, struct proc_dir_entry *); #endif /* The default sysctl tables: */ static ctl_table root_table[] = { {CTL_KERN, "kernel", NULL, 0, 0555, kern_table}, {CTL_VM, "vm", NULL, 0, 0555, vm_table}, #ifdef CONFIG_NET {CTL_NET, "net", NULL, 0, 0555, net_table}, #endif {CTL_PROC, "proc", NULL, 0, 0555, proc_table}, {CTL_FS, "fs", NULL, 0, 0555, fs_table}, {CTL_DEBUG, "debug", NULL, 0, 0555, debug_table}, {CTL_DEV, "dev", NULL, 0, 0555, dev_table}, {0} }; static ctl_table kern_table[] = { {KERN_OSTYPE, "ostype", system_utsname.sysname, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_OSRELEASE, "osrelease", system_utsname.release, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_VERSION, "version", system_utsname.version, 64, 0444, NULL, &proc_doutsstring, &sysctl_string}, {KERN_NODENAME, "hostname", system_utsname.nodename, 64, 0644, NULL, &proc_doutsstring, &sysctl_string}, {KERN_DOMAINNAME, "domainname", system_utsname.domainname, 64, 0644, NULL, &proc_doutsstring, &sysctl_string}, {KERN_PANIC, "panic", &panic_timeout, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_CORE_USES_PID, "core_uses_pid", &core_uses_pid, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_TAINTED, "tainted", &tainted, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_CAP_BSET, "cap-bound", &cap_bset, sizeof(kernel_cap_t), 0600, NULL, &proc_dointvec_bset}, #ifdef CONFIG_BLK_DEV_INITRD {KERN_REALROOTDEV, "real-root-dev", &real_root_dev, sizeof(int), 0644, NULL, &proc_dointvec}, #endif #ifdef __sparc__ {KERN_SPARC_REBOOT, "reboot-cmd", reboot_command, 256, 0644, NULL, &proc_dostring, &sysctl_string }, {KERN_SPARC_STOP_A, "stop-a", &stop_a_enabled, sizeof (int), 0644, NULL, &proc_dointvec}, #endif #ifdef CONFIG_PPC32 {KERN_PPC_ZEROPAGED, "zero-paged", &zero_paged_on, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PPC_POWERSAVE_NAP, "powersave-nap", &powersave_nap, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PPC_L2CR, "l2cr", NULL, 0, 0644, NULL, &proc_dol2crvec}, #endif {KERN_CTLALTDEL, "ctrl-alt-del", &C_A_D, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_PRINTK, "printk", &console_loglevel, 4*sizeof(int), 0644, NULL, &proc_dointvec}, #ifdef CONFIG_KMOD {KERN_MODPROBE, "modprobe", &modprobe_path, 256, 0644, NULL, &proc_dostring, &sysctl_string }, #endif #ifdef CONFIG_HOTPLUG {KERN_HOTPLUG, "hotplug", &hotplug_path, 256, 0644, NULL, &proc_dostring, &sysctl_string }, #endif #ifdef CONFIG_CHR_DEV_SG {KERN_SG_BIG_BUFF, "sg-big-buff", &sg_big_buff, sizeof (int), 0444, NULL, &proc_dointvec}, #endif #ifdef CONFIG_BSD_PROCESS_ACCT {KERN_ACCT, "acct", &acct_parm, 3*sizeof(int), 0644, NULL, &proc_dointvec}, #endif {KERN_RTSIGNR, "rtsig-nr", &nr_queued_signals, sizeof(int), 0444, NULL, &proc_dointvec}, {KERN_RTSIGMAX, "rtsig-max", &max_queued_signals, sizeof(int), 0644, NULL, &proc_dointvec}, #ifdef CONFIG_SYSVIPC {KERN_SHMMAX, "shmmax", &shm_ctlmax, sizeof (size_t), 0644, NULL, &proc_doulongvec_minmax}, {KERN_SHMALL, "shmall", &shm_ctlall, sizeof (size_t), 0644, NULL, &proc_doulongvec_minmax}, {KERN_SHMMNI, "shmmni", &shm_ctlmni, sizeof (int), 0644, NULL, &proc_dointvec}, {KERN_MSGMAX, "msgmax", &msg_ctlmax, sizeof (int), 0644, NULL, &proc_dointvec}, {KERN_MSGMNI, "msgmni", &msg_ctlmni, sizeof (int), 0644, NULL, &proc_dointvec}, {KERN_MSGMNB, "msgmnb", &msg_ctlmnb, sizeof (int), 0644, NULL, &proc_dointvec}, {KERN_SEM, "sem", &sem_ctls, 4*sizeof (int), 0644, NULL, &proc_dointvec}, #endif #ifdef CONFIG_MAGIC_SYSRQ {KERN_SYSRQ, "sysrq", &sysrq_enabled, sizeof (int), 0644, NULL, &proc_dointvec}, #endif {KERN_CADPID, "cad_pid", &cad_pid, sizeof (int), 0600, NULL, &proc_dointvec}, {KERN_MAX_THREADS, "threads-max", &max_threads, sizeof(int), 0644, NULL, &proc_dointvec}, {KERN_RANDOM, "random", NULL, 0, 0555, random_table}, {KERN_OVERFLOWUID, "overflowuid", &overflowuid, sizeof(int), 0644, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &minolduid, &maxolduid}, {KERN_OVERFLOWGID, "overflowgid", &overflowgid, sizeof(int), 0644, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &minolduid, &maxolduid}, #ifdef CONFIG_ARCH_S390 #ifdef CONFIG_MATHEMU {KERN_IEEE_EMULATION_WARNINGS,"ieee_emulation_warnings", &sysctl_ieee_emulation_warnings,sizeof(int),0644,NULL,&proc_dointvec}, #endif {KERN_S390_USER_DEBUG_LOGGING,"userprocess_debug", &sysctl_userprocess_debug,sizeof(int),0644,NULL,&proc_dointvec}, #endif {0} }; static ctl_table vm_table[] = { {VM_BDFLUSH, "bdflush", &bdf_prm, 9*sizeof(int), 0644, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &bdflush_min, &bdflush_max}, {VM_OVERCOMMIT_MEMORY, "overcommit_memory", &sysctl_overcommit_memory, sizeof(sysctl_overcommit_memory), 0644, NULL, &proc_dointvec}, {VM_PAGERDAEMON, "kswapd", &pager_daemon, sizeof(pager_daemon_t), 0644, NULL, &proc_dointvec}, {VM_PGT_CACHE, "pagetable_cache", &pgt_cache_water, 2*sizeof(int), 0644, NULL, &proc_dointvec}, {VM_PAGE_CLUSTER, "page-cluster", &page_cluster, sizeof(int), 0644, NULL, &proc_dointvec}, {VM_MIN_READAHEAD, "min-readahead", &vm_min_readahead,sizeof(int), 0644, NULL, &proc_dointvec}, {VM_MAX_READAHEAD, "max-readahead", &vm_max_readahead,sizeof(int), 0644, NULL, &proc_dointvec}, {VM_MAX_MAP_COUNT, "max_map_count", &max_map_count, sizeof(int), 0644, NULL, &proc_dointvec}, {0} }; static ctl_table proc_table[] = { {0} }; static ctl_table fs_table[] = { {FS_NRINODE, "inode-nr", &inodes_stat, 2*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_STATINODE, "inode-state", &inodes_stat, 7*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_NRFILE, "file-nr", &files_stat, 3*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_MAXFILE, "file-max", &files_stat.max_files, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_NRDQUOT, "dquot-nr", &nr_dquots, 2*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_DENTRY, "dentry-state", &dentry_stat, 6*sizeof(int), 0444, NULL, &proc_dointvec}, {FS_OVERFLOWUID, "overflowuid", &fs_overflowuid, sizeof(int), 0644, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &minolduid, &maxolduid}, {FS_OVERFLOWGID, "overflowgid", &fs_overflowgid, sizeof(int), 0644, NULL, &proc_dointvec_minmax, &sysctl_intvec, NULL, &minolduid, &maxolduid}, {FS_LEASES, "leases-enable", &leases_enable, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_DIR_NOTIFY, "dir-notify-enable", &dir_notify_enable, sizeof(int), 0644, NULL, &proc_dointvec}, {FS_LEASE_TIME, "lease-break-time", &lease_break_time, sizeof(int), 0644, NULL, &proc_dointvec}, {0} }; static ctl_table debug_table[] = { {0} }; static ctl_table dev_table[] = { {0} }; extern void init_irq_proc (void); void __init sysctl_init(void) { #ifdef CONFIG_PROC_FS register_proc_table(root_table, proc_sys_root); init_irq_proc(); #endif } int do_sysctl(int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen) { struct list_head *tmp; if (nlen <= 0 || nlen >= CTL_MAXNAME) return -ENOTDIR; if (oldval) { int old_len; if (!oldlenp || get_user(old_len, oldlenp)) return -EFAULT; } tmp = &root_table_header.ctl_entry; do { struct ctl_table_header *head = list_entry(tmp, struct ctl_table_header, ctl_entry); void *context = NULL; int error = parse_table(name, nlen, oldval, oldlenp, newval, newlen, head->ctl_table, &context); if (context) kfree(context); if (error != -ENOTDIR) return error; tmp = tmp->next; } while (tmp != &root_table_header.ctl_entry); return -ENOTDIR; } extern asmlinkage long sys_sysctl(struct __sysctl_args *args) { struct __sysctl_args tmp; int error; if (copy_from_user(&tmp, args, sizeof(tmp))) return -EFAULT; lock_kernel(); error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp, tmp.newval, tmp.newlen); unlock_kernel(); return error; } /* * ctl_perm does NOT grant the superuser all rights automatically, because * some sysctl variables are readonly even to root. */ static int test_perm(int mode, int op) { if (!current->euid) mode >>= 6; else if (in_egroup_p(0)) mode >>= 3; if ((mode & op & 0007) == op) return 0; return -EACCES; } static inline int ctl_perm(ctl_table *table, int op) { return test_perm(table->mode, op); } static int parse_table(int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, ctl_table *table, void **context) { int n; repeat: if (!nlen) return -ENOTDIR; if (get_user(n, name)) return -EFAULT; for ( ; table->ctl_name; table++) { if (n == table->ctl_name || table->ctl_name == CTL_ANY) { int error; if (table->child) { if (ctl_perm(table, 001)) return -EPERM; if (table->strategy) { error = table->strategy( table, name, nlen, oldval, oldlenp, newval, newlen, context); if (error) return error; } name++; nlen--; table = table->child; goto repeat; } error = do_sysctl_strategy(table, name, nlen, oldval, oldlenp, newval, newlen, context); return error; } } return -ENOTDIR; } /* Perform the actual read/write of a sysctl table entry. */ int do_sysctl_strategy (ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { int op = 0, rc; size_t len; if (oldval) op |= 004; if (newval) op |= 002; if (ctl_perm(table, op)) return -EPERM; if (table->strategy) { rc = table->strategy(table, name, nlen, oldval, oldlenp, newval, newlen, context); if (rc < 0) return rc; if (rc > 0) return 0; } /* If there is no strategy routine, or if the strategy returns * zero, proceed with automatic r/w */ if (table->data && table->maxlen) { if (oldval && oldlenp) { get_user(len, oldlenp); if (len) { if (len > table->maxlen) len = table->maxlen; if(copy_to_user(oldval, table->data, len)) return -EFAULT; if(put_user(len, oldlenp)) return -EFAULT; } } if (newval && newlen) { len = newlen; if (len > table->maxlen) len = table->maxlen; if(copy_from_user(table->data, newval, len)) return -EFAULT; } } return 0; } /** * register_sysctl_table - register a sysctl hierarchy * @table: the top-level table structure * @insert_at_head: whether the entry should be inserted in front or at the end * * Register a sysctl table hierarchy. @table should be a filled in ctl_table * array. An entry with a ctl_name of 0 terminates the table. * * The members of the &ctl_table structure are used as follows: * * ctl_name - This is the numeric sysctl value used by sysctl(2). The number * must be unique within that level of sysctl * * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not * enter a sysctl file * * data - a pointer to data for use by proc_handler * * maxlen - the maximum size in bytes of the data * * mode - the file permissions for the /proc/sys file, and for sysctl(2) * * child - a pointer to the child sysctl table if this entry is a directory, or * %NULL. * * proc_handler - the text handler routine (described below) * * strategy - the strategy routine (described below) * * de - for internal use by the sysctl routines * * extra1, extra2 - extra pointers usable by the proc handler routines * * Leaf nodes in the sysctl tree will be represented by a single file * under /proc; non-leaf nodes will be represented by directories. * * sysctl(2) can automatically manage read and write requests through * the sysctl table. The data and maxlen fields of the ctl_table * struct enable minimal validation of the values being written to be * performed, and the mode field allows minimal authentication. * * More sophisticated management can be enabled by the provision of a * strategy routine with the table entry. This will be called before * any automatic read or write of the data is performed. * * The strategy routine may return * * < 0 - Error occurred (error is passed to user process) * * 0 - OK - proceed with automatic read or write. * * > 0 - OK - read or write has been done by the strategy routine, so * return immediately. * * There must be a proc_handler routine for any terminal nodes * mirrored under /proc/sys (non-terminals are handled by a built-in * directory handler). Several default handlers are available to * cover common cases - * * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(), * proc_dointvec_minmax(), proc_doulongvec_ms_jiffies_minmax(), * proc_doulongvec_minmax() * * It is the handler's job to read the input buffer from user memory * and process it. The handler should return 0 on success. * * This routine returns %NULL on a failure to register, and a pointer * to the table header on success. */ struct ctl_table_header *register_sysctl_table(ctl_table * table, int insert_at_head) { struct ctl_table_header *tmp; tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL); if (!tmp) return NULL; tmp->ctl_table = table; INIT_LIST_HEAD(&tmp->ctl_entry); if (insert_at_head) list_add(&tmp->ctl_entry, &root_table_header.ctl_entry); else list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry); #ifdef CONFIG_PROC_FS register_proc_table(table, proc_sys_root); #endif return tmp; } /** * unregister_sysctl_table - unregister a sysctl table hierarchy * @header: the header returned from register_sysctl_table * * Unregisters the sysctl table and all children. proc entries may not * actually be removed until they are no longer used by anyone. */ void unregister_sysctl_table(struct ctl_table_header * header) { list_del(&header->ctl_entry); #ifdef CONFIG_PROC_FS unregister_proc_table(header->ctl_table, proc_sys_root); #endif kfree(header); } /* * /proc/sys support */ #ifdef CONFIG_PROC_FS /* Scan the sysctl entries in table and add them all into /proc */ static void register_proc_table(ctl_table * table, struct proc_dir_entry *root) { struct proc_dir_entry *de; int len; mode_t mode; for (; table->ctl_name; table++) { /* Can't do anything without a proc name. */ if (!table->procname) continue; /* Maybe we can't do anything with it... */ if (!table->proc_handler && !table->child) { printk(KERN_WARNING "SYSCTL: Can't register %s\n", table->procname); continue; } len = strlen(table->procname); mode = table->mode; de = NULL; if (table->proc_handler) mode |= S_IFREG; else { mode |= S_IFDIR; for (de = root->subdir; de; de = de->next) { if (proc_match(len, table->procname, de)) break; } /* If the subdir exists already, de is non-NULL */ } if (!de) { de = create_proc_entry(table->procname, mode, root); if (!de) continue; de->data = (void *) table; if (table->proc_handler) { de->proc_fops = &proc_sys_file_operations; de->proc_iops = &proc_sys_inode_operations; } } table->de = de; if (de->mode & S_IFDIR) register_proc_table(table->child, de); } } /* * Unregister a /proc sysctl table and any subdirectories. */ static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root) { struct proc_dir_entry *de; for (; table->ctl_name; table++) { if (!(de = table->de)) continue; if (de->mode & S_IFDIR) { if (!table->child) { printk (KERN_ALERT "Help - malformed sysctl tree on free\n"); continue; } unregister_proc_table(table->child, de); /* Don't unregister directories which still have entries.. */ if (de->subdir) continue; } /* Don't unregister proc entries that are still being used.. */ if (atomic_read(&de->count)) continue; table->de = NULL; remove_proc_entry(table->procname, root); } } static ssize_t do_rw_proc(int write, struct file * file, char * buf, size_t count, loff_t *ppos) { int op; struct proc_dir_entry *de; struct ctl_table *table; size_t res; ssize_t error; de = (struct proc_dir_entry*) file->f_dentry->d_inode->u.generic_ip; if (!de || !de->data) return -ENOTDIR; table = (struct ctl_table *) de->data; if (!table || !table->proc_handler) return -ENOTDIR; op = (write ? 002 : 004); if (ctl_perm(table, op)) return -EPERM; res = count; /* * FIXME: we need to pass on ppos to the handler. */ error = (*table->proc_handler) (table, write, file, buf, &res); if (error) return error; return res; } static ssize_t proc_readsys(struct file * file, char * buf, size_t count, loff_t *ppos) { return do_rw_proc(0, file, buf, count, ppos); } static ssize_t proc_writesys(struct file * file, const char * buf, size_t count, loff_t *ppos) { return do_rw_proc(1, file, (char *) buf, count, ppos); } static int proc_sys_permission(struct inode *inode, int op) { return test_perm(inode->i_mode, op); } /** * proc_dostring - read a string sysctl * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes a string from/to the user buffer. If the kernel * buffer provided is not large enough to hold the string, the * string is truncated. The copied string is %NULL-terminated. * If the string is being read by the user process, it is copied * and a newline '\n' is added. It is truncated if the buffer is * not large enough. * * Returns 0 on success. */ int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { size_t len; char *p, c; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } if (write) { len = 0; p = buffer; while (len < *lenp) { if(get_user(c, p++)) return -EFAULT; if (c == 0 || c == '\n') break; len++; } if (len >= table->maxlen) len = table->maxlen-1; if(copy_from_user(table->data, buffer, len)) return -EFAULT; ((char *) table->data)[len] = 0; filp->f_pos += *lenp; } else { len = strlen(table->data); if (len > table->maxlen) len = table->maxlen; if (len > *lenp) len = *lenp; if (len) if(copy_to_user(buffer, table->data, len)) return -EFAULT; if (len < *lenp) { if(put_user('\n', ((char *) buffer) + len)) return -EFAULT; len++; } *lenp = len; filp->f_pos += len; } return 0; } /* * Special case of dostring for the UTS structure. This has locks * to observe. Should this be in kernel/sys.c ???? */ static int proc_doutsstring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { int r; if (!write) { down_read(&uts_sem); r=proc_dostring(table,0,filp,buffer,lenp); up_read(&uts_sem); } else { down_write(&uts_sem); r=proc_dostring(table,1,filp,buffer,lenp); up_write(&uts_sem); } return r; } #define OP_SET 0 #define OP_AND 1 #define OP_OR 2 #define OP_MAX 3 #define OP_MIN 4 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp, int conv, int op) { int *i, vleft, first=1, neg, val; size_t left, len; #define TMPBUFLEN 20 char buf[TMPBUFLEN], *p; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } i = (int *) table->data; vleft = table->maxlen / sizeof(int); left = *lenp; for (; left && vleft--; i++, first=0) { if (write) { while (left) { char c; if(get_user(c,(char *) buffer)) return -EFAULT; if (!isspace(c)) break; left--; ((char *) buffer)++; } if (!left) break; neg = 0; len = left; if (len > TMPBUFLEN-1) len = TMPBUFLEN-1; if(copy_from_user(buf, buffer, len)) return -EFAULT; buf[len] = 0; p = buf; if (*p == '-' && left > 1) { neg = 1; left--, p++; } if (*p < '0' || *p > '9') break; val = simple_strtoul(p, &p, 0) * conv; len = p-buf; if ((len < left) && *p && !isspace(*p)) break; if (neg) val = -val; buffer += len; left -= len; switch(op) { case OP_SET: *i = val; break; case OP_AND: *i &= val; break; case OP_OR: *i |= val; break; case OP_MAX: if(*i < val) *i = val; break; case OP_MIN: if(*i > val) *i = val; break; } } else { p = buf; if (!first) *p++ = '\t'; sprintf(p, "%d", (*i) / conv); len = strlen(buf); if (len > left) len = left; if(copy_to_user(buffer, buf, len)) return -EFAULT; left -= len; buffer += len; } } if (!write && !first && left) { if(put_user('\n', (char *) buffer)) return -EFAULT; left--, buffer++; } if (write) { p = (char *) buffer; while (left) { char c; if(get_user(c, p++)) return -EFAULT; if (!isspace(c)) break; left--; } } if (write && first) return -EINVAL; *lenp -= left; filp->f_pos += *lenp; return 0; } /** * proc_dointvec - read a vector of integers * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes up to table->maxlen/sizeof(unsigned int) integer * values from/to the user buffer, treated as an ASCII string. * * Returns 0 on success. */ int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_dointvec(table,write,filp,buffer,lenp,1,OP_SET); } /* * init may raise the set. */ int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { if (!capable(CAP_SYS_MODULE)) { return -EPERM; } return do_proc_dointvec(table,write,filp,buffer,lenp,1, (current->pid == 1) ? OP_SET : OP_AND); } /** * proc_dointvec_minmax - read a vector of integers with min/max values * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes up to table->maxlen/sizeof(unsigned int) integer * values from/to the user buffer, treated as an ASCII string. * * This routine will ensure the values are within the range specified by * table->extra1 (min) and table->extra2 (max). * * Returns 0 on success. */ int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { int *i, *min, *max, vleft, first=1, neg, val; size_t len, left; #define TMPBUFLEN 20 char buf[TMPBUFLEN], *p; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } i = (int *) table->data; min = (int *) table->extra1; max = (int *) table->extra2; vleft = table->maxlen / sizeof(int); left = *lenp; for (; left && vleft--; i++, first=0) { if (write) { while (left) { char c; if(get_user(c, (char *) buffer)) return -EFAULT; if (!isspace(c)) break; left--; ((char *) buffer)++; } if (!left) break; neg = 0; len = left; if (len > TMPBUFLEN-1) len = TMPBUFLEN-1; if(copy_from_user(buf, buffer, len)) return -EFAULT; buf[len] = 0; p = buf; if (*p == '-' && left > 1) { neg = 1; left--, p++; } if (*p < '0' || *p > '9') break; val = simple_strtoul(p, &p, 0); len = p-buf; if ((len < left) && *p && !isspace(*p)) break; if (neg) val = -val; buffer += len; left -= len; if (min && val < *min++) continue; if (max && val > *max++) continue; *i = val; } else { p = buf; if (!first) *p++ = '\t'; sprintf(p, "%d", *i); len = strlen(buf); if (len > left) len = left; if(copy_to_user(buffer, buf, len)) return -EFAULT; left -= len; buffer += len; } } if (!write && !first && left) { if(put_user('\n', (char *) buffer)) return -EFAULT; left--, buffer++; } if (write) { p = (char *) buffer; while (left) { char c; if(get_user(c, p++)) return -EFAULT; if (!isspace(c)) break; left--; } } if (write && first) return -EINVAL; *lenp -= left; filp->f_pos += *lenp; return 0; } static int do_proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp, unsigned long convmul, unsigned long convdiv) { #define TMPBUFLEN 20 unsigned long *i, *min, *max, val; int vleft, first=1, neg; size_t len, left; char buf[TMPBUFLEN], *p; if (!table->data || !table->maxlen || !*lenp || (filp->f_pos && !write)) { *lenp = 0; return 0; } i = (unsigned long *) table->data; min = (unsigned long *) table->extra1; max = (unsigned long *) table->extra2; vleft = table->maxlen / sizeof(unsigned long); left = *lenp; for (; left && vleft--; i++, first=0) { if (write) { while (left) { char c; if(get_user(c, (char *) buffer)) return -EFAULT; if (!isspace(c)) break; left--; ((char *) buffer)++; } if (!left) break; neg = 0; len = left; if (len > TMPBUFLEN-1) len = TMPBUFLEN-1; if(copy_from_user(buf, buffer, len)) return -EFAULT; buf[len] = 0; p = buf; if (*p == '-' && left > 1) { neg = 1; left--, p++; } if (*p < '0' || *p > '9') break; val = simple_strtoul(p, &p, 0) * convmul / convdiv ; len = p-buf; if ((len < left) && *p && !isspace(*p)) break; if (neg) val = -val; buffer += len; left -= len; if(neg) continue; if (min && val < *min++) continue; if (max && val > *max++) continue; *i = val; } else { p = buf; if (!first) *p++ = '\t'; sprintf(p, "%lu", convdiv * (*i) / convmul); len = strlen(buf); if (len > left) len = left; if(copy_to_user(buffer, buf, len)) return -EFAULT; left -= len; buffer += len; } } if (!write && !first && left) { if(put_user('\n', (char *) buffer)) return -EFAULT; left--, buffer++; } if (write) { p = (char *) buffer; while (left) { char c; if(get_user(c, p++)) return -EFAULT; if (!isspace(c)) break; left--; } } if (write && first) return -EINVAL; *lenp -= left; filp->f_pos += *lenp; return 0; #undef TMPBUFLEN } /** * proc_doulongvec_minmax - read a vector of long integers with min/max values * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long * values from/to the user buffer, treated as an ASCII string. * * This routine will ensure the values are within the range specified by * table->extra1 (min) and table->extra2 (max). * * Returns 0 on success. */ int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, 1l, 1l); } /** * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long * values from/to the user buffer, treated as an ASCII string. The values * are treated as milliseconds, and converted to jiffies when they are stored. * * This routine will ensure the values are within the range specified by * table->extra1 (min) and table->extra2 (max). * * Returns 0 on success. */ int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, HZ, 1000l); } /** * proc_dointvec_jiffies - read a vector of integers as seconds * @table: the sysctl table * @write: %TRUE if this is a write to the sysctl file * @filp: the file structure * @buffer: the user buffer * @lenp: the size of the user buffer * * Reads/writes up to table->maxlen/sizeof(unsigned int) integer * values from/to the user buffer, treated as an ASCII string. * The values read are assumed to be in seconds, and are converted into * jiffies. * * Returns 0 on success. */ int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return do_proc_dointvec(table,write,filp,buffer,lenp,HZ,OP_SET); } #else /* CONFIG_PROC_FS */ int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } static int proc_doutsstring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } #endif /* CONFIG_PROC_FS */ /* * General sysctl support routines */ /* The generic string strategy routine: */ int sysctl_string(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { size_t l, len; if (!table->data || !table->maxlen) return -ENOTDIR; if (oldval && oldlenp) { if(get_user(len, oldlenp)) return -EFAULT; if (len) { l = strlen(table->data); if (len > l) len = l; if (len >= table->maxlen) len = table->maxlen; if(copy_to_user(oldval, table->data, len)) return -EFAULT; if(put_user(0, ((char *) oldval) + len)) return -EFAULT; if(put_user(len, oldlenp)) return -EFAULT; } } if (newval && newlen) { len = newlen; if (len > table->maxlen) len = table->maxlen; if(copy_from_user(table->data, newval, len)) return -EFAULT; if (len == table->maxlen) len--; ((char *) table->data)[len] = 0; } return 0; } /* * This function makes sure that all of the integers in the vector * are between the minimum and maximum values given in the arrays * table->extra1 and table->extra2, respectively. */ int sysctl_intvec(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { int i, *vec, *min, *max; size_t length; if (newval && newlen) { if (newlen % sizeof(int) != 0) return -EINVAL; if (!table->extra1 && !table->extra2) return 0; if (newlen > table->maxlen) newlen = table->maxlen; length = newlen / sizeof(int); vec = (int *) newval; min = (int *) table->extra1; max = (int *) table->extra2; for (i = 0; i < length; i++) { int value; get_user(value, vec + i); if (min && value < min[i]) return -EINVAL; if (max && value > max[i]) return -EINVAL; } } return 0; } /* Strategy function to convert jiffies to seconds */ int sysctl_jiffies(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { if (oldval) { size_t olen; if (oldlenp) { if (get_user(olen, oldlenp)) return -EFAULT; if (olen!=sizeof(int)) return -EINVAL; } if (put_user(*(int *)(table->data) / HZ, (int *)oldval) || (oldlenp && put_user(sizeof(int),oldlenp))) return -EFAULT; } if (newval && newlen) { int new; if (newlen != sizeof(int)) return -EINVAL; if (get_user(new, (int *)newval)) return -EFAULT; *(int *)(table->data) = new*HZ; } return 1; } #else /* CONFIG_SYSCTL */ extern asmlinkage long sys_sysctl(struct __sysctl_args *args) { return -ENOSYS; } int sysctl_string(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { return -ENOSYS; } int sysctl_intvec(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { return -ENOSYS; } int sysctl_jiffies(ctl_table *table, int *name, int nlen, void *oldval, size_t *oldlenp, void *newval, size_t newlen, void **context) { return -ENOSYS; } int proc_dostring(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_bset(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write, struct file *filp, void *buffer, size_t *lenp) { return -ENOSYS; } struct ctl_table_header * register_sysctl_table(ctl_table * table, int insert_at_head) { return 0; } void unregister_sysctl_table(struct ctl_table_header * table) { } #endif /* CONFIG_SYSCTL */