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Subject[patch 15/38] CKRM e18: Rule Based Classification Engine, stub rcfs support
Part 1 of 5 patches to support Rule Based Classification Engine for CKRM.
This patch provides the the basic rcfs interface for rbce. It just provides
the interface with stub functions.

Signed-Off-By: Hubertus Franke <frankeh@us.ibm.com>
Signed-Off-By: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-Off-By: Shailabh Nagar <nagar@us.ibm.com>
Signed-Off-By: Vivek Kashyap <vivk@us.ibm.com>
Signed-Off-By: Gerrit Huizenga <gh@us.ibm.com>

include/linux/rbce.h | 28 ++
init/Kconfig | 12 +
kernel/ckrm/Makefile | 1
kernel/ckrm/rbce/Makefile | 6
kernel/ckrm/rbce/rbce_fs.c | 365 +++++++++++++++++++++++++++++++++++++++
kernel/ckrm/rbce/rbce_internal.h | 59 ++++++
kernel/ckrm/rbce/rbce_main.c | 97 ++++++++++
7 files changed, 568 insertions(+)

Index: linux-2.6.12-ckrm1/include/linux/rbce.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/include/linux/rbce.h 2005-06-20 13:08:42.000000000 -0700
@@ -0,0 +1,28 @@
+/* Rule-based Classification Engine (RBCE) module
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ *
+ * Module for loading of classification policies and providing
+ * a user API for Class-based Kernel Resource Management (CKRM)
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ *
+ */
+
+#ifndef _LINUX_RBCE_H
+#define _LINUX_RBCE_H
+
+#define RBCE_MOD_DESCR "Rule Based Classification Engine Module for CKRM"
+#define RBCE_MOD_NAME "rbce"
+
+#endif /* _LINUX_RBCE_H */
Index: linux-2.6.12-ckrm1/init/Kconfig
===================================================================
--- linux-2.6.12-ckrm1.orig/init/Kconfig 2005-06-20 13:08:34.000000000 -0700
+++ linux-2.6.12-ckrm1/init/Kconfig 2005-06-20 13:08:42.000000000 -0700
@@ -203,6 +203,18 @@ config CKRM_RES_NUMTASKS

Say N if unsure, Y to use the feature.

+
+config CKRM_RBCE
+ tristate "Vanilla Rule-based Classification Engine (RBCE)"
+ depends on CKRM && RCFS_FS
+ default m
+ help
+ Provides an optional module to support creation of rules for automatic
+ classification of kernel objects. Rules are created/deleted/modified
+ through an rcfs interface. RBCE is not required for CKRM.
+
+ If unsure, say N.
+
endmenu

config SYSCTL
Index: linux-2.6.12-ckrm1/kernel/ckrm/Makefile
===================================================================
--- linux-2.6.12-ckrm1.orig/kernel/ckrm/Makefile 2005-06-20 13:08:34.000000000 -0700
+++ linux-2.6.12-ckrm1/kernel/ckrm/Makefile 2005-06-20 13:08:42.000000000 -0700
@@ -6,3 +6,4 @@ obj-y += ckrm_events.o ckrm.o ckrmutils.
obj-$(CONFIG_CKRM_TYPE_TASKCLASS) += ckrm_tc.o ckrm_numtasks_stub.o
obj-$(CONFIG_CKRM_TYPE_SOCKETCLASS) += ckrm_sockc.o
obj-$(CONFIG_CKRM_RES_NUMTASKS) += ckrm_numtasks.o
+obj-$(CONFIG_CKRM_RBCE) += rbce/
Index: linux-2.6.12-ckrm1/kernel/ckrm/rbce/Makefile
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/rbce/Makefile 2005-06-20 13:08:42.000000000 -0700
@@ -0,0 +1,6 @@
+#
+# Makefile for RBCE
+#
+
+obj-$(CONFIG_CKRM_RBCE) += rbce.o
+rbce-objs := rbce_fs.o rbce_main.o
Index: linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_fs.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_fs.c 2005-06-20 13:08:42.000000000 -0700
@@ -0,0 +1,365 @@
+/*
+ * RCFS API for Rule-based Classification Engine (RBCE)
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Vivek Kashyap, IBM Corp. 2004
+ *
+ * Module for loading of classification policies and providing
+ * a user API for Class-based Kernel Resource Management (CKRM)
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <linux/pagemap.h>
+#include <linux/rcfs.h>
+#include "rbce_internal.h"
+
+#define CONFIG_CE_DIR "ce"
+#define CONFIG_RULES_DIR "rules"
+#define CONFIG_RBCE_STATE "rbce_state"
+#define CONFIG_RBCE_TAG "rbce_tag"
+
+static int rbce_unlink(struct inode *, struct dentry *);
+
+static ssize_t
+rbce_write(struct file *file, const char __user * buf,
+ size_t len, loff_t * ppos)
+{
+ char *line, *ptr;
+ int rc = 0, pid;
+
+ line = kmalloc(len + 1, GFP_KERNEL);
+ if (!line) {
+ return -ENOMEM;
+ }
+ if (copy_from_user(line, buf, len)) {
+ kfree(line);
+ return -EFAULT;
+ }
+ line[len] = '\0';
+ ptr = line;
+ while (*ptr) {
+ if (*ptr == '\n') {
+ *ptr = '\0';
+ break;
+ }
+ ptr++;
+ }
+ if (!strcmp(file->f_dentry->d_name.name, CONFIG_RBCE_TAG)) {
+ pid = simple_strtol(line, &ptr, 0);
+ rc = rbce_set_tasktag(pid, ptr + 1); /* syntax "pid tag" */
+ } else if (!strcmp(file->f_dentry->d_name.name, CONFIG_RBCE_STATE))
+ rbce_enabled = line[0] - '0';
+ else
+ rc = rbce_change_rule(file->f_dentry->d_name.name, line);
+ if (rc)
+ len = rc;
+ kfree(line);
+ return len;
+}
+
+static int rbce_show(struct seq_file *seq, void *offset)
+{
+ struct file *file = (struct file *)seq->private;
+ char result[256];
+
+ memset(result, 0, 256);
+ if (!strcmp(file->f_dentry->d_name.name, CONFIG_RBCE_TAG))
+ return -EPERM;
+ if (!strcmp(file->f_dentry->d_name.name, CONFIG_RBCE_STATE))
+ seq_printf(seq, "%d\n", rbce_enabled);
+ else {
+ rbce_get_rule(file->f_dentry->d_name.name, result);
+ seq_printf(seq, "%s\n", result);
+ }
+ return 0;
+}
+
+static int rbce_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rbce_show, file);
+}
+
+static int rbce_close(struct inode *ino, struct file *file)
+{
+ const char *name = file->f_dentry->d_name.name;
+
+ if (strcmp(name, CONFIG_RBCE_STATE) &&
+ strcmp(name, CONFIG_RBCE_TAG) &&
+ !rbce_rule_exists(name))
+ rbce_unlink(file->f_dentry->d_parent->d_inode, file->f_dentry);
+ return single_release(ino, file);
+}
+
+static struct file_operations rbce_file_operations;
+static struct inode_operations rbce_file_inode_operations;
+static struct inode_operations rbce_dir_inode_operations;
+
+static struct inode *rbce_get_inode(struct inode *dir, int mode, dev_t dev)
+{
+ struct inode *inode = new_inode(dir->i_sb);
+
+ if (inode) {
+ inode->i_mode = mode;
+ inode->i_uid = current->fsuid;
+ inode->i_gid = current->fsgid;
+ inode->i_blksize = PAGE_CACHE_SIZE;
+ inode->i_blocks = 0;
+ inode->i_mapping->a_ops = dir->i_mapping->a_ops;
+ inode->i_mapping->backing_dev_info =
+ dir->i_mapping->backing_dev_info;
+ inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+ switch (mode & S_IFMT) {
+ default:
+ init_special_inode(inode, mode, dev);
+ break;
+ case S_IFREG:
+ /* Treat as default assignment */
+ inode->i_op = &rbce_file_inode_operations;
+ inode->i_fop = &rbce_file_operations;
+ break;
+ case S_IFDIR:
+ inode->i_op = &rbce_dir_inode_operations;
+ inode->i_fop = &simple_dir_operations;
+
+ /* directory inodes start off with i_nlink == 2
+ (for "." entry) */
+ inode->i_nlink++;
+ break;
+ }
+ }
+ return inode;
+}
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+static int
+rbce_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+ struct inode *inode = rbce_get_inode(dir, mode, dev);
+ int error = -ENOSPC;
+
+ if (inode) {
+ if (dir->i_mode & S_ISGID) {
+ inode->i_gid = dir->i_gid;
+ if (S_ISDIR(mode))
+ inode->i_mode |= S_ISGID;
+ }
+ d_instantiate(dentry, inode);
+ dget(dentry); /* Extra count - pin the dentry in core */
+ error = 0;
+
+ }
+ return error;
+}
+
+static int rbce_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ int rc;
+
+ rc = rbce_delete_rule(dentry->d_name.name);
+ if (rc == 0) {
+ if (dir)
+ dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+ inode->i_ctime = CURRENT_TIME;
+ inode->i_nlink--;
+ dput(dentry);
+ }
+ return rc;
+}
+
+static int
+rbce_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ int rc;
+ struct inode *inode = old_dentry->d_inode;
+ struct dentry *old_d = list_entry(old_dir->i_dentry.next,
+ struct dentry, d_alias);
+ struct dentry *new_d = list_entry(new_dir->i_dentry.next,
+ struct dentry, d_alias);
+
+ /* Do not allow renaming any directory */
+ if (S_ISDIR(old_dentry->d_inode->i_mode))
+ return -EINVAL;
+
+ /* Do not allow renaming files just under under /ce */
+ if (!strcmp(old_d->d_name.name, CONFIG_CE_DIR))
+ return -EINVAL;
+
+ /* cannot move anything to /ce */
+ if (!strcmp(new_d->d_name.name, CONFIG_CE_DIR))
+ return -EINVAL;
+
+ rc = rbce_rename_rule(old_dentry->d_name.name, new_dentry->d_name.name);
+
+ if (!rc)
+ old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime =
+ new_dir->i_mtime = inode->i_ctime = CURRENT_TIME;
+ return rc;
+}
+
+/* CE allows only the rules directory to be created */
+int rbce_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ int retval = -EINVAL;
+
+ struct dentry *pd =
+ list_entry(dir->i_dentry.next, struct dentry, d_alias);
+
+ /* Allow only /rcfs/ce and ce/rules */
+ if ((!strcmp(pd->d_name.name, CONFIG_CE_DIR) &&
+ !strcmp(dentry->d_name.name, CONFIG_RULES_DIR)) ||
+ (!strcmp(pd->d_name.name, "/") &&
+ !strcmp(dentry->d_name.name, CONFIG_CE_DIR))) {
+ if (!strcmp(dentry->d_name.name, CONFIG_CE_DIR))
+ try_module_get(THIS_MODULE);
+ retval = rbce_mknod(dir, dentry, mode | S_IFDIR, 0);
+ if (!retval)
+ dir->i_nlink++;
+ }
+
+ return retval;
+}
+
+/* CE doesn't allow deletion of directory */
+int rbce_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int rc;
+ rc = simple_rmdir(dir, dentry);
+
+ if (!rc && !strcmp(dentry->d_name.name, CONFIG_CE_DIR))
+ module_put(THIS_MODULE);
+ return rc;
+}
+
+static int
+rbce_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
+{
+ struct dentry *pd =
+ list_entry(dir->i_dentry.next, struct dentry, d_alias);
+
+ /* No creation allowed under ce */
+ if (!strcmp(pd->d_name.name, CONFIG_CE_DIR))
+ return -EINVAL;
+
+ return rbce_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int rbce_link(struct dentry *old_d, struct inode *dir, struct dentry *d)
+{
+ return -EINVAL;
+}
+
+static int
+rbce_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
+{
+ return -EINVAL;
+}
+
+/******************************* Config files ********************/
+
+#define RBCE_NR_CONFIG 5
+struct rcfs_magf rbce_config_files[RBCE_NR_CONFIG] = {
+ {
+ .name = CONFIG_CE_DIR,
+ .mode = RCFS_DEFAULT_DIR_MODE,
+ .i_op = &rbce_dir_inode_operations,
+ },
+ {
+ .name = CONFIG_RBCE_TAG,
+ .mode = RCFS_DEFAULT_FILE_MODE,
+ .i_fop = &rbce_file_operations,
+ },
+ {
+ .name = CONFIG_RBCE_STATE,
+ .mode = RCFS_DEFAULT_FILE_MODE,
+ .i_fop = &rbce_file_operations,
+ },
+ {
+ .name = CONFIG_RULES_DIR,
+ .mode = (RCFS_DEFAULT_DIR_MODE | S_IWUSR),
+ .i_fop = &simple_dir_operations,
+ .i_op = &rbce_dir_inode_operations,
+ }
+};
+
+static struct dentry *ce_root_dentry;
+
+int rbce_create_config(void)
+{
+ int rc;
+
+ /* Make root dentry */
+ rc = rcfs_mkroot(rbce_config_files, RBCE_NR_CONFIG, &ce_root_dentry);
+ if ((!ce_root_dentry) || rc)
+ return rc;
+
+ /* Create config files */
+ if ((rc = rcfs_create_magic(ce_root_dentry, &rbce_config_files[1],
+ RBCE_NR_CONFIG - 1))) {
+ printk(KERN_ERR "Failed to create c/rbce config files."
+ " Deleting c/rbce root\n");
+ rcfs_rmroot(ce_root_dentry);
+ return rc;
+ }
+
+ return rc;
+}
+
+int rbce_clear_config(void)
+{
+ int rc = 0;
+ if (ce_root_dentry)
+ rc = rcfs_rmroot(ce_root_dentry);
+ return rc;
+}
+
+/******************************* File ops ********************/
+
+static struct file_operations rbce_file_operations = {
+ .owner = THIS_MODULE,
+ .open = rbce_open,
+ .llseek = seq_lseek,
+ .read = seq_read,
+ .write = rbce_write,
+ .release = rbce_close,
+};
+
+static struct inode_operations rbce_file_inode_operations = {
+ .getattr = simple_getattr,
+};
+
+static struct inode_operations rbce_dir_inode_operations = {
+ .create = rbce_create,
+ .lookup = simple_lookup,
+ .link = rbce_link,
+ .unlink = rbce_unlink,
+ .symlink = rbce_symlink,
+ .mkdir = rbce_mkdir,
+ .rmdir = rbce_rmdir,
+ .mknod = rbce_mknod,
+ .rename = rbce_rename,
+ .getattr = simple_getattr,
+};
+
+struct rbce_eng_callback rbce_rcfs_ecbs = {
+ rbce_mkdir,
+ rbce_rmdir,
+ rbce_create_config,
+ rbce_clear_config
+};
Index: linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_internal.h
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_internal.h 2005-06-20 13:08:42.000000000 -0700
@@ -0,0 +1,59 @@
+/*
+ * rbce internal header file.
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Vivek Kashyap, IBM Corp. 2004
+ *
+ * Module for loading of classification policies and providing
+ * a user API for Class-based Kernel Resource Management (CKRM)
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#ifndef _RBCE_INTERNAL_H
+#define _RBCE_INTERNAL_H
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/mount.h>
+#include <linux/proc_fs.h>
+#include <linux/limits.h>
+#include <linux/pid.h>
+#include <linux/sysctl.h>
+
+#include <linux/ckrm_rc.h>
+#include <linux/ckrm_ce.h>
+#include <linux/ckrm_net.h>
+#include <linux/rbce.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+extern int rbce_enabled;
+extern struct rbce_eng_callback rbce_rcfs_ecbs;
+
+extern int rbce_mkdir(struct inode *, struct dentry *, int);
+extern int rbce_rmdir(struct inode *, struct dentry *);
+extern int rbce_create_config(void);
+extern int rbce_clear_config(void);
+
+extern void rbce_get_rule(const char *, char *);
+extern int rbce_rule_exists(const char *);
+extern int rbce_change_rule(const char *, char *);
+extern int rbce_delete_rule(const char *);
+extern int rbce_set_tasktag(int, char *);
+extern int rbce_rename_rule(const char *, const char *);
+
+#endif /* _RBCE_INTERNAL_H */
Index: linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_main.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-ckrm1/kernel/ckrm/rbce/rbce_main.c 2005-06-20 13:08:42.000000000 -0700
@@ -0,0 +1,97 @@
+/*
+ * Rule Functionality and module initialization and destrution
+ * for Rule-based Classification Engine (RBCE)
+ *
+ * Copyright (C) Hubertus Franke, IBM Corp. 2003
+ * (C) Chandra Seetharaman, IBM Corp. 2003
+ * (C) Vivek Kashyap, IBM Corp. 2004
+ *
+ * Module for loading of classification policies and providing
+ * a user API for Class-based Kernel Resource Management (CKRM)
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include "rbce_internal.h"
+
+MODULE_DESCRIPTION(RBCE_MOD_DESCR);
+MODULE_AUTHOR("Hubertus Franke, Chandra Seetharaman (IBM)");
+MODULE_LICENSE("GPL");
+
+static char modname[] = RBCE_MOD_NAME;
+
+/* Stub routines for now */
+void rbce_get_rule(const char *a, char *b)
+{
+}
+int rbce_rule_exists(const char *a)
+{
+ return 0;
+}
+int rbce_change_rule(const char *a, char *b)
+{
+ return 1;
+}
+int rbce_delete_rule(const char *a)
+{
+ return 1;
+}
+int rbce_set_tasktag(int i, char *a)
+{
+ return 1;
+}
+int rbce_rename_rule(const char *a, const char *b)
+{
+ return 1;
+}
+
+int rbce_enabled = 1;
+/* ======================= Module definition Functions ====================== */
+
+int init_rbce(void)
+{
+ int rc, line;
+
+ printk(KERN_INFO "Installing \'%s\' module\n", modname);
+
+ rc = rcfs_register_engine(&rbce_rcfs_ecbs);
+ line = __LINE__;
+ if (rc)
+ goto out;
+
+ if (rcfs_mounted) {
+ rc = rbce_create_config();
+ line = __LINE__;
+ if (!rc)
+ goto out;
+ }
+
+ rcfs_unregister_engine(&rbce_rcfs_ecbs);
+out:
+ printk(KERN_ERR "%s: error installing rc=%d line=%d\n",
+ __FUNCTION__, rc, line);
+ return rc;
+}
+
+void exit_rbce(void)
+{
+ printk(KERN_INFO "Removing \'%s\' module\n", modname);
+
+ if (rcfs_mounted)
+ rbce_clear_config();
+
+ rcfs_unregister_engine(&rbce_rcfs_ecbs);
+}
+
+module_init(init_rbce);
+module_exit(exit_rbce);
--
-
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