/*
   * security/tomoyo/util.c
   *
   * Utility functions for TOMOYO.
   *
   * Copyright (C) 2005-2010  NTT DATA CORPORATION
   */
  
  #include <linux/slab.h>
  #include "common.h"
  
  /* Lock for protecting policy. */
  DEFINE_MUTEX(tomoyo_policy_lock);
  
  /* Has /sbin/init started? */
  bool tomoyo_policy_loaded;
  
  /**
   * tomoyo_parse_ulong - Parse an "unsigned long" value.
   *
   * @result: Pointer to "unsigned long".
   * @str:    Pointer to string to parse.
   *
   * Returns value type on success, 0 otherwise.
   *
   * The @src is updated to point the first character after the value
   * on success.
   */

  static u8 tomoyo_parse_ulong(unsigned long *result, char **str)

  {
  	const char *cp = *str;
  	char *ep;
  	int base = 10;
  	if (*cp == '0') {
  		char c = *(cp + 1);
  		if (c == 'x' || c == 'X') {
  			base = 16;
  			cp += 2;
  		} else if (c >= '0' && c <= '7') {
  			base = 8;
  			cp++;
  		}
  	}
  	*result = simple_strtoul(cp, &ep, base);
  	if (cp == ep)
  		return 0;
  	*str = ep;
  	switch (base) {
  	case 16:
  		return TOMOYO_VALUE_TYPE_HEXADECIMAL;
  	case 8:
  		return TOMOYO_VALUE_TYPE_OCTAL;
  	default:
  		return TOMOYO_VALUE_TYPE_DECIMAL;
  	}
  }
  
  /**
   * tomoyo_print_ulong - Print an "unsigned long" value.
   *
   * @buffer:     Pointer to buffer.
   * @buffer_len: Size of @buffer.
   * @value:      An "unsigned long" value.
   * @type:       Type of @value.
   *
   * Returns nothing.
   */
  void tomoyo_print_ulong(char *buffer, const int buffer_len,
  			const unsigned long value, const u8 type)
  {
  	if (type == TOMOYO_VALUE_TYPE_DECIMAL)
  		snprintf(buffer, buffer_len, "%lu", value);
  	else if (type == TOMOYO_VALUE_TYPE_OCTAL)
  		snprintf(buffer, buffer_len, "0%lo", value);
  	else if (type == TOMOYO_VALUE_TYPE_HEXADECIMAL)
  		snprintf(buffer, buffer_len, "0x%lX", value);
  	else
  		snprintf(buffer, buffer_len, "type(%u)", type);
  }
  
  /**
   * tomoyo_parse_name_union - Parse a tomoyo_name_union.
   *
   * @filename: Name or name group.
   * @ptr:      Pointer to "struct tomoyo_name_union".
   *
   * Returns true on success, false otherwise.
   */
  bool tomoyo_parse_name_union(const char *filename,
  			     struct tomoyo_name_union *ptr)
  {

  	if (!tomoyo_correct_word(filename))

  		return false;
  	if (filename[0] == '@') {

  		ptr->group = tomoyo_get_group(filename + 1, TOMOYO_PATH_GROUP);

  		ptr->is_group = true;
  		return ptr->group != NULL;
  	}
  	ptr->filename = tomoyo_get_name(filename);
  	ptr->is_group = false;
  	return ptr->filename != NULL;
  }
  
  /**
   * tomoyo_parse_number_union - Parse a tomoyo_number_union.
   *
   * @data: Number or number range or number group.
   * @ptr:  Pointer to "struct tomoyo_number_union".
   *
   * Returns true on success, false otherwise.
   */
  bool tomoyo_parse_number_union(char *data, struct tomoyo_number_union *num)
  {
  	u8 type;
  	unsigned long v;
  	memset(num, 0, sizeof(*num));
  	if (data[0] == '@') {

  		if (!tomoyo_correct_word(data))

  			return false;

  		num->group = tomoyo_get_group(data + 1, TOMOYO_NUMBER_GROUP);

  		num->is_group = true;
  		return num->group != NULL;
  	}
  	type = tomoyo_parse_ulong(&v, &data);
  	if (!type)
  		return false;
  	num->values[0] = v;
  	num->min_type = type;
  	if (!*data) {
  		num->values[1] = v;
  		num->max_type = type;
  		return true;
  	}
  	if (*data++ != '-')
  		return false;
  	type = tomoyo_parse_ulong(&v, &data);
  	if (!type || *data)
  		return false;
  	num->values[1] = v;
  	num->max_type = type;
  	return true;
  }
  
  /**

   * tomoyo_byte_range - Check whether the string is a \ooo style octal value.

   *
   * @str: Pointer to the string.
   *
   * Returns true if @str is a \ooo style octal value, false otherwise.
   *
   * TOMOYO uses \ooo style representation for 0x01 - 0x20 and 0x7F - 0xFF.
   * This function verifies that \ooo is in valid range.
   */

  static inline bool tomoyo_byte_range(const char *str)

  {
  	return *str >= '0' && *str++ <= '3' &&
  		*str >= '0' && *str++ <= '7' &&
  		*str >= '0' && *str <= '7';
  }
  
  /**

   * tomoyo_alphabet_char - Check whether the character is an alphabet.

   *
   * @c: The character to check.
   *
   * Returns true if @c is an alphabet character, false otherwise.
   */

  static inline bool tomoyo_alphabet_char(const char c)

  {
  	return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
  }
  
  /**
   * tomoyo_make_byte - Make byte value from three octal characters.
   *
   * @c1: The first character.
   * @c2: The second character.
   * @c3: The third character.
   *
   * Returns byte value.
   */
  static inline u8 tomoyo_make_byte(const u8 c1, const u8 c2, const u8 c3)
  {
  	return ((c1 - '0') << 6) + ((c2 - '0') << 3) + (c3 - '0');
  }
  
  /**
   * tomoyo_str_starts - Check whether the given string starts with the given keyword.
   *
   * @src:  Pointer to pointer to the string.
   * @find: Pointer to the keyword.
   *
   * Returns true if @src starts with @find, false otherwise.
   *
   * The @src is updated to point the first character after the @find
   * if @src starts with @find.
   */
  bool tomoyo_str_starts(char **src, const char *find)
  {
  	const int len = strlen(find);
  	char *tmp = *src;
  
  	if (strncmp(tmp, find, len))
  		return false;
  	tmp += len;
  	*src = tmp;
  	return true;
  }
  
  /**
   * tomoyo_normalize_line - Format string.
   *
   * @buffer: The line to normalize.
   *
   * Leading and trailing whitespaces are removed.
   * Multiple whitespaces are packed into single space.
   *
   * Returns nothing.
   */
  void tomoyo_normalize_line(unsigned char *buffer)
  {
  	unsigned char *sp = buffer;
  	unsigned char *dp = buffer;
  	bool first = true;

  	while (tomoyo_invalid(*sp))

  		sp++;
  	while (*sp) {
  		if (!first)
  			*dp++ = ' ';
  		first = false;

  		while (tomoyo_valid(*sp))

  			*dp++ = *sp++;

  		while (tomoyo_invalid(*sp))

  			sp++;
  	}
  	*dp = '\0';
  }
  
  /**
   * tomoyo_tokenize - Tokenize string.
   *
   * @buffer: The line to tokenize.
   * @w:      Pointer to "char *".
   * @size:   Sizeof @w .
   *
   * Returns true on success, false otherwise.
   */
  bool tomoyo_tokenize(char *buffer, char *w[], size_t size)
  {
  	int count = size / sizeof(char *);
  	int i;
  	for (i = 0; i < count; i++)
  		w[i] = "";
  	for (i = 0; i < count; i++) {
  		char *cp = strchr(buffer, ' ');
  		if (cp)
  			*cp = '\0';
  		w[i] = buffer;
  		if (!cp)
  			break;
  		buffer = cp + 1;
  	}
  	return i < count || !*buffer;
  }
  
  /**

   * tomoyo_correct_word2 - Validate a string.

   *

   * @string: The string to check. May be non-'\0'-terminated.
   * @len:    Length of @string.

   *

   * Check whether the given string follows the naming rules.
   * Returns true if @string follows the naming rules, false otherwise.

   */

  static bool tomoyo_correct_word2(const char *string, size_t len)

  {

  	const char *const start = string;

  	bool in_repetition = false;

  	unsigned char c;
  	unsigned char d;
  	unsigned char e;

  	if (!len)

  		goto out;

  	while (len--) {
  		c = *string++;

  		if (c == '\\') {

  			if (!len--)
  				goto out;
  			c = *string++;

  			switch (c) {
  			case '\\':  /* "\\" */
  				continue;
  			case '$':   /* "\$" */
  			case '+':   /* "\+" */
  			case '?':   /* "\?" */
  			case '*':   /* "\*" */
  			case '@':   /* "\@" */
  			case 'x':   /* "\x" */
  			case 'X':   /* "\X" */
  			case 'a':   /* "\a" */
  			case 'A':   /* "\A" */
  			case '-':   /* "\-" */

  				continue;
  			case '{':   /* "/\{" */

  				if (string - 3 < start || *(string - 3) != '/')

  					break;

  				in_repetition = true;
  				continue;
  			case '}':   /* "\}/" */

  				if (*string != '/')

  					break;
  				if (!in_repetition)
  					break;
  				in_repetition = false;
  				continue;
  			case '0':   /* "\ooo" */
  			case '1':
  			case '2':
  			case '3':

  				if (!len-- || !len--)

  					break;

  				d = *string++;
  				e = *string++;
  				if (d < '0' || d > '7' || e < '0' || e > '7')

  					break;
  				c = tomoyo_make_byte(c, d, e);

  				if (tomoyo_invalid(c))

  					continue; /* pattern is not \000 */
  			}
  			goto out;
  		} else if (in_repetition && c == '/') {
  			goto out;

  		} else if (tomoyo_invalid(c)) {

  			goto out;
  		}
  	}

  	if (in_repetition)
  		goto out;
  	return true;
   out:
  	return false;
  }
  
  /**

   * tomoyo_correct_word - Validate a string.

   *
   * @string: The string to check.
   *
   * Check whether the given string follows the naming rules.
   * Returns true if @string follows the naming rules, false otherwise.
   */

  bool tomoyo_correct_word(const char *string)

  {

  	return tomoyo_correct_word2(string, strlen(string));

  }
  
  /**

   * tomoyo_correct_path - Validate a pathname.

   *
   * @filename: The pathname to check.
   *
   * Check whether the given pathname follows the naming rules.
   * Returns true if @filename follows the naming rules, false otherwise.
   */

  bool tomoyo_correct_path(const char *filename)

  {

  	return *filename == '/' && tomoyo_correct_word(filename);

  }
  
  /**

   * tomoyo_correct_domain - Check whether the given domainname follows the naming rules.

   *

   * @domainname: The domainname to check.

   *
   * Returns true if @domainname follows the naming rules, false otherwise.
   */

  bool tomoyo_correct_domain(const unsigned char *domainname)

  {

  	if (!domainname || strncmp(domainname, TOMOYO_ROOT_NAME,
  				   TOMOYO_ROOT_NAME_LEN))
  		goto out;
  	domainname += TOMOYO_ROOT_NAME_LEN;
  	if (!*domainname)
  		return true;

  	if (*domainname++ != ' ')
  		goto out;
  	while (1) {
  		const unsigned char *cp = strchr(domainname, ' ');
  		if (!cp)
  			break;
  		if (*domainname != '/' ||

  		    !tomoyo_correct_word2(domainname, cp - domainname - 1))

  			goto out;

  		domainname = cp + 1;
  	}

  	return tomoyo_correct_path(domainname);

   out:
  	return false;
  }
  
  /**

   * tomoyo_domain_def - Check whether the given token can be a domainname.

   *
   * @buffer: The token to check.
   *
   * Returns true if @buffer possibly be a domainname, false otherwise.
   */

  bool tomoyo_domain_def(const unsigned char *buffer)

  {
  	return !strncmp(buffer, TOMOYO_ROOT_NAME, TOMOYO_ROOT_NAME_LEN);
  }
  
  /**
   * tomoyo_find_domain - Find a domain by the given name.
   *
   * @domainname: The domainname to find.
   *
   * Returns pointer to "struct tomoyo_domain_info" if found, NULL otherwise.
   *
   * Caller holds tomoyo_read_lock().
   */
  struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname)
  {
  	struct tomoyo_domain_info *domain;
  	struct tomoyo_path_info name;
  
  	name.name = domainname;
  	tomoyo_fill_path_info(&name);
  	list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
  		if (!domain->is_deleted &&
  		    !tomoyo_pathcmp(&name, domain->domainname))
  			return domain;
  	}
  	return NULL;
  }
  
  /**
   * tomoyo_const_part_length - Evaluate the initial length without a pattern in a token.
   *
   * @filename: The string to evaluate.
   *
   * Returns the initial length without a pattern in @filename.
   */
  static int tomoyo_const_part_length(const char *filename)
  {
  	char c;
  	int len = 0;
  
  	if (!filename)
  		return 0;
  	while ((c = *filename++) != '\0') {
  		if (c != '\\') {
  			len++;
  			continue;
  		}
  		c = *filename++;
  		switch (c) {
  		case '\\':  /* "\\" */
  			len += 2;
  			continue;
  		case '0':   /* "\ooo" */
  		case '1':
  		case '2':
  		case '3':
  			c = *filename++;
  			if (c < '0' || c > '7')
  				break;
  			c = *filename++;
  			if (c < '0' || c > '7')
  				break;
  			len += 4;
  			continue;
  		}
  		break;
  	}
  	return len;
  }
  
  /**
   * tomoyo_fill_path_info - Fill in "struct tomoyo_path_info" members.
   *
   * @ptr: Pointer to "struct tomoyo_path_info" to fill in.
   *
   * The caller sets "struct tomoyo_path_info"->name.
   */
  void tomoyo_fill_path_info(struct tomoyo_path_info *ptr)
  {
  	const char *name = ptr->name;
  	const int len = strlen(name);
  
  	ptr->const_len = tomoyo_const_part_length(name);
  	ptr->is_dir = len && (name[len - 1] == '/');
  	ptr->is_patterned = (ptr->const_len < len);
  	ptr->hash = full_name_hash(name, len);
  }
  
  /**
   * tomoyo_file_matches_pattern2 - Pattern matching without '/' character and "\-" pattern.
   *
   * @filename:     The start of string to check.
   * @filename_end: The end of string to check.
   * @pattern:      The start of pattern to compare.
   * @pattern_end:  The end of pattern to compare.
   *
   * Returns true if @filename matches @pattern, false otherwise.
   */
  static bool tomoyo_file_matches_pattern2(const char *filename,
  					 const char *filename_end,
  					 const char *pattern,
  					 const char *pattern_end)
  {
  	while (filename < filename_end && pattern < pattern_end) {
  		char c;
  		if (*pattern != '\\') {
  			if (*filename++ != *pattern++)
  				return false;
  			continue;
  		}
  		c = *filename;
  		pattern++;
  		switch (*pattern) {
  			int i;
  			int j;
  		case '?':
  			if (c == '/') {
  				return false;
  			} else if (c == '\\') {
  				if (filename[1] == '\\')
  					filename++;

  				else if (tomoyo_byte_range(filename + 1))

  					filename += 3;
  				else
  					return false;
  			}
  			break;
  		case '\\':
  			if (c != '\\')
  				return false;
  			if (*++filename != '\\')
  				return false;
  			break;
  		case '+':
  			if (!isdigit(c))
  				return false;
  			break;
  		case 'x':
  			if (!isxdigit(c))
  				return false;
  			break;
  		case 'a':

  			if (!tomoyo_alphabet_char(c))

  				return false;
  			break;
  		case '0':
  		case '1':
  		case '2':
  		case '3':

  			if (c == '\\' && tomoyo_byte_range(filename + 1)

  			    && strncmp(filename + 1, pattern, 3) == 0) {
  				filename += 3;
  				pattern += 2;
  				break;
  			}
  			return false; /* Not matched. */
  		case '*':
  		case '@':
  			for (i = 0; i <= filename_end - filename; i++) {
  				if (tomoyo_file_matches_pattern2(
  						    filename + i, filename_end,
  						    pattern + 1, pattern_end))
  					return true;
  				c = filename[i];
  				if (c == '.' && *pattern == '@')
  					break;
  				if (c != '\\')
  					continue;
  				if (filename[i + 1] == '\\')
  					i++;

  				else if (tomoyo_byte_range(filename + i + 1))

  					i += 3;
  				else
  					break; /* Bad pattern. */
  			}
  			return false; /* Not matched. */
  		default:
  			j = 0;
  			c = *pattern;
  			if (c == '$') {
  				while (isdigit(filename[j]))
  					j++;
  			} else if (c == 'X') {
  				while (isxdigit(filename[j]))
  					j++;
  			} else if (c == 'A') {

  				while (tomoyo_alphabet_char(filename[j]))

  					j++;
  			}
  			for (i = 1; i <= j; i++) {
  				if (tomoyo_file_matches_pattern2(
  						    filename + i, filename_end,
  						    pattern + 1, pattern_end))
  					return true;
  			}
  			return false; /* Not matched or bad pattern. */
  		}
  		filename++;
  		pattern++;
  	}
  	while (*pattern == '\\' &&
  	       (*(pattern + 1) == '*' || *(pattern + 1) == '@'))
  		pattern += 2;
  	return filename == filename_end && pattern == pattern_end;
  }
  
  /**
   * tomoyo_file_matches_pattern - Pattern matching without '/' character.
   *
   * @filename:     The start of string to check.
   * @filename_end: The end of string to check.
   * @pattern:      The start of pattern to compare.
   * @pattern_end:  The end of pattern to compare.
   *
   * Returns true if @filename matches @pattern, false otherwise.
   */
  static bool tomoyo_file_matches_pattern(const char *filename,
  					const char *filename_end,
  					const char *pattern,
  					const char *pattern_end)
  {
  	const char *pattern_start = pattern;
  	bool first = true;
  	bool result;
  
  	while (pattern < pattern_end - 1) {
  		/* Split at "\-" pattern. */
  		if (*pattern++ != '\\' || *pattern++ != '-')
  			continue;
  		result = tomoyo_file_matches_pattern2(filename,
  						      filename_end,
  						      pattern_start,
  						      pattern - 2);
  		if (first)
  			result = !result;
  		if (result)
  			return false;
  		first = false;
  		pattern_start = pattern;
  	}
  	result = tomoyo_file_matches_pattern2(filename, filename_end,
  					      pattern_start, pattern_end);
  	return first ? result : !result;
  }
  
  /**
   * tomoyo_path_matches_pattern2 - Do pathname pattern matching.
   *
   * @f: The start of string to check.
   * @p: The start of pattern to compare.
   *
   * Returns true if @f matches @p, false otherwise.
   */
  static bool tomoyo_path_matches_pattern2(const char *f, const char *p)
  {
  	const char *f_delimiter;
  	const char *p_delimiter;
  
  	while (*f && *p) {
  		f_delimiter = strchr(f, '/');
  		if (!f_delimiter)
  			f_delimiter = f + strlen(f);
  		p_delimiter = strchr(p, '/');
  		if (!p_delimiter)
  			p_delimiter = p + strlen(p);
  		if (*p == '\\' && *(p + 1) == '{')
  			goto recursive;
  		if (!tomoyo_file_matches_pattern(f, f_delimiter, p,
  						 p_delimiter))
  			return false;
  		f = f_delimiter;
  		if (*f)
  			f++;
  		p = p_delimiter;
  		if (*p)
  			p++;
  	}
  	/* Ignore trailing "\*" and "\@" in @pattern. */
  	while (*p == '\\' &&
  	       (*(p + 1) == '*' || *(p + 1) == '@'))
  		p += 2;
  	return !*f && !*p;
   recursive:
  	/*
  	 * The "\{" pattern is permitted only after '/' character.
  	 * This guarantees that below "*(p - 1)" is safe.
  	 * Also, the "\}" pattern is permitted only before '/' character
  	 * so that "\{" + "\}" pair will not break the "\-" operator.
  	 */
  	if (*(p - 1) != '/' || p_delimiter <= p + 3 || *p_delimiter != '/' ||
  	    *(p_delimiter - 1) != '}' || *(p_delimiter - 2) != '\\')
  		return false; /* Bad pattern. */
  	do {
  		/* Compare current component with pattern. */
  		if (!tomoyo_file_matches_pattern(f, f_delimiter, p + 2,
  						 p_delimiter - 2))
  			break;
  		/* Proceed to next component. */
  		f = f_delimiter;
  		if (!*f)
  			break;
  		f++;
  		/* Continue comparison. */
  		if (tomoyo_path_matches_pattern2(f, p_delimiter + 1))
  			return true;
  		f_delimiter = strchr(f, '/');
  	} while (f_delimiter);
  	return false; /* Not matched. */
  }
  
  /**
   * tomoyo_path_matches_pattern - Check whether the given filename matches the given pattern.
   *
   * @filename: The filename to check.
   * @pattern:  The pattern to compare.
   *
   * Returns true if matches, false otherwise.
   *
   * The following patterns are available.
   *   \\     \ itself.
   *   \ooo   Octal representation of a byte.
   *   \*     Zero or more repetitions of characters other than '/'.
   *   \@     Zero or more repetitions of characters other than '/' or '.'.
   *   \?     1 byte character other than '/'.
   *   \$     One or more repetitions of decimal digits.
   *   \+     1 decimal digit.
   *   \X     One or more repetitions of hexadecimal digits.
   *   \x     1 hexadecimal digit.
   *   \A     One or more repetitions of alphabet characters.
   *   \a     1 alphabet character.
   *
   *   \-     Subtraction operator.
   *
   *   /\{dir\}/   '/' + 'One or more repetitions of dir/' (e.g. /dir/ /dir/dir/
   *               /dir/dir/dir/ ).
   */
  bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
  				 const struct tomoyo_path_info *pattern)
  {
  	const char *f = filename->name;
  	const char *p = pattern->name;
  	const int len = pattern->const_len;
  
  	/* If @pattern doesn't contain pattern, I can use strcmp(). */
  	if (!pattern->is_patterned)
  		return !tomoyo_pathcmp(filename, pattern);
  	/* Don't compare directory and non-directory. */
  	if (filename->is_dir != pattern->is_dir)
  		return false;
  	/* Compare the initial length without patterns. */
  	if (strncmp(f, p, len))
  		return false;
  	f += len;
  	p += len;
  	return tomoyo_path_matches_pattern2(f, p);
  }
  
  /**
   * tomoyo_get_exe - Get tomoyo_realpath() of current process.
   *
   * Returns the tomoyo_realpath() of current process on success, NULL otherwise.
   *
   * This function uses kzalloc(), so the caller must call kfree()
   * if this function didn't return NULL.
   */
  const char *tomoyo_get_exe(void)
  {
  	struct mm_struct *mm = current->mm;
  	struct vm_area_struct *vma;
  	const char *cp = NULL;
  
  	if (!mm)
  		return NULL;
  	down_read(&mm->mmap_sem);
  	for (vma = mm->mmap; vma; vma = vma->vm_next) {
  		if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file) {
  			cp = tomoyo_realpath_from_path(&vma->vm_file->f_path);
  			break;
  		}
  	}
  	up_read(&mm->mmap_sem);
  	return cp;
  }
  
  /**

   * tomoyo_get_mode - Get MAC mode.
   *
   * @profile: Profile number.
   * @index:   Index number of functionality.
   *
   * Returns mode.
   */
  int tomoyo_get_mode(const u8 profile, const u8 index)
  {
  	u8 mode;
  	const u8 category = TOMOYO_MAC_CATEGORY_FILE;
  	if (!tomoyo_policy_loaded)
  		return TOMOYO_CONFIG_DISABLED;
  	mode = tomoyo_profile(profile)->config[index];
  	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
  		mode = tomoyo_profile(profile)->config[category];
  	if (mode == TOMOYO_CONFIG_USE_DEFAULT)
  		mode = tomoyo_profile(profile)->default_config;
  	return mode & 3;
  }
  
  /**

   * tomoyo_init_request_info - Initialize "struct tomoyo_request_info" members.
   *
   * @r:      Pointer to "struct tomoyo_request_info" to initialize.
   * @domain: Pointer to "struct tomoyo_domain_info". NULL for tomoyo_domain().

   * @index:  Index number of functionality.

   *
   * Returns mode.
   */
  int tomoyo_init_request_info(struct tomoyo_request_info *r,

  			     struct tomoyo_domain_info *domain, const u8 index)

  {

  	u8 profile;

  	memset(r, 0, sizeof(*r));
  	if (!domain)
  		domain = tomoyo_domain();
  	r->domain = domain;

  	profile = domain->profile;
  	r->profile = profile;
  	r->type = index;
  	r->mode = tomoyo_get_mode(profile, index);

  	return r->mode;
  }
  
  /**

   * tomoyo_last_word - Get last component of a line.
   *
   * @line: A line.
   *
   * Returns the last word of a line.
   */

  const char *tomoyo_last_word(const char *name)

  {
  	const char *cp = strrchr(name, ' ');
  	if (cp)
  		return cp + 1;
  	return name;
  }
  
  /**

   * tomoyo_warn_log - Print warning or error message on console.
   *
   * @r:   Pointer to "struct tomoyo_request_info".
   * @fmt: The printf()'s format string, followed by parameters.
   */
  void tomoyo_warn_log(struct tomoyo_request_info *r, const char *fmt, ...)
  {

  	va_list args;
  	char *buffer;

  	const struct tomoyo_domain_info * const domain = r->domain;
  	const struct tomoyo_profile *profile = tomoyo_profile(domain->profile);
  	switch (r->mode) {
  	case TOMOYO_CONFIG_ENFORCING:
  		if (!profile->enforcing->enforcing_verbose)

  			return;

  		break;
  	case TOMOYO_CONFIG_PERMISSIVE:
  		if (!profile->permissive->permissive_verbose)
  			return;
  		break;
  	case TOMOYO_CONFIG_LEARNING:
  		if (!profile->learning->learning_verbose)
  			return;
  		break;

  	}

  	buffer = kmalloc(4096, GFP_NOFS);
  	if (!buffer)
  		return;
  	va_start(args, fmt);
  	vsnprintf(buffer, 4095, fmt, args);
  	va_end(args);
  	buffer[4095] = '\0';
  	printk(KERN_WARNING "%s: Access %s denied for %s
  ",
  	       r->mode == TOMOYO_CONFIG_ENFORCING ? "ERROR" : "WARNING", buffer,
  	       tomoyo_last_word(domain->domainname->name));

  	kfree(buffer);
  }
  
  /**
   * tomoyo_domain_quota_is_ok - Check for domain's quota.
   *
   * @r: Pointer to "struct tomoyo_request_info".
   *
   * Returns true if the domain is not exceeded quota, false otherwise.
   *
   * Caller holds tomoyo_read_lock().
   */
  bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r)
  {
  	unsigned int count = 0;
  	struct tomoyo_domain_info *domain = r->domain;
  	struct tomoyo_acl_info *ptr;
  
  	if (r->mode != TOMOYO_CONFIG_LEARNING)
  		return false;
  	if (!domain)
  		return true;
  	list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) {

  		if (ptr->is_deleted)

  			continue;

  		switch (ptr->type) {
  			u16 perm;
  			u8 i;
  		case TOMOYO_TYPE_PATH_ACL:
  			perm = container_of(ptr, struct tomoyo_path_acl, head)
  				->perm;
  			for (i = 0; i < TOMOYO_MAX_PATH_OPERATION; i++)
  				if (perm & (1 << i))
  					count++;
  			if (perm & (1 << TOMOYO_TYPE_READ_WRITE))
  				count -= 2;
  			break;
  		case TOMOYO_TYPE_PATH2_ACL:
  			perm = container_of(ptr, struct tomoyo_path2_acl, head)
  				->perm;
  			for (i = 0; i < TOMOYO_MAX_PATH2_OPERATION; i++)
  				if (perm & (1 << i))
  					count++;
  			break;
  		case TOMOYO_TYPE_PATH_NUMBER_ACL:
  			perm = container_of(ptr, struct tomoyo_path_number_acl,
  					    head)->perm;
  			for (i = 0; i < TOMOYO_MAX_PATH_NUMBER_OPERATION; i++)
  				if (perm & (1 << i))
  					count++;
  			break;

  		case TOMOYO_TYPE_MKDEV_ACL:
  			perm = container_of(ptr, struct tomoyo_mkdev_acl,

  					    head)->perm;

  			for (i = 0; i < TOMOYO_MAX_MKDEV_OPERATION; i++)

  				if (perm & (1 << i))
  					count++;
  			break;

  		default:
  			count++;

  		}
  	}

  	if (count < tomoyo_profile(domain->profile)->learning->
  	    learning_max_entry)

  		return true;
  	if (!domain->quota_warned) {
  		domain->quota_warned = true;
  		printk(KERN_WARNING "TOMOYO-WARNING: "
  		       "Domain '%s' has so many ACLs to hold. "
  		       "Stopped learning mode.
  ", domain->domainname->name);
  	}
  	return false;
  }