/* audit -- definition of audit_context structure and supporting types 
   *
   * Copyright 2003-2004 Red Hat, Inc.
   * Copyright 2005 Hewlett-Packard Development Company, L.P.
   * Copyright 2005 IBM Corporation
   *
   * 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 will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include <linux/fs.h>
  #include <linux/audit.h>

  #include <linux/skbuff.h>

  
  /* 0 = no checking
     1 = put_count checking
     2 = verbose put_count checking
  */
  #define AUDIT_DEBUG 0
  
  /* At task start time, the audit_state is set in the audit_context using
     a per-task filter.  At syscall entry, the audit_state is augmented by
     the syscall filter. */
  enum audit_state {
  	AUDIT_DISABLED,		/* Do not create per-task audit_context.
  				 * No syscall-specific audit records can
  				 * be generated. */
  	AUDIT_SETUP_CONTEXT,	/* Create the per-task audit_context,
  				 * but don't necessarily fill it in at
  				 * syscall entry time (i.e., filter
  				 * instead). */
  	AUDIT_BUILD_CONTEXT,	/* Create the per-task audit_context,
  				 * and always fill it in at syscall
  				 * entry time.  This makes a full
  				 * syscall record available if some
  				 * other part of the kernel decides it
  				 * should be recorded. */
  	AUDIT_RECORD_CONTEXT	/* Create the per-task audit_context,
  				 * always fill it in at syscall entry
  				 * time, and always write out the audit
  				 * record at syscall exit time.  */
  };
  
  /* Rule lists */

  struct audit_watch;

  struct audit_tree;
  struct audit_chunk;

  struct audit_entry {

  	struct list_head	list;
  	struct rcu_head		rcu;
  	struct audit_krule	rule;

  };

  #ifdef CONFIG_AUDIT
  extern int audit_enabled;
  extern int audit_ever_enabled;
  #endif

  extern int audit_pid;

  #define AUDIT_INODE_BUCKETS	32
  extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
  
  static inline int audit_hash_ino(u32 ino)
  {
  	return (ino & (AUDIT_INODE_BUCKETS-1));
  }

  extern int audit_match_class(int class, unsigned syscall);

  extern int audit_comparator(const u32 left, const u32 op, const u32 right);

  extern int audit_compare_dname_path(const char *dname, const char *path,
  				    int *dirlen);

  extern struct sk_buff *	    audit_make_reply(int pid, int seq, int type,
  					     int done, int multi,
  					     void *payload, int size);

  extern void		    audit_send_reply(int pid, int seq, int type,
  					     int done, int multi,
  					     void *payload, int size);

  extern void		    audit_panic(const char *message);

  struct audit_netlink_list {
  	int pid;
  	struct sk_buff_head q;
  };
  
  int audit_send_list(void *);

  extern int selinux_audit_rule_update(void);

  extern struct mutex audit_filter_mutex;
  extern void audit_free_rule_rcu(struct rcu_head *);

  extern struct list_head audit_filter_list[];

  /* audit watch functions */
  extern unsigned long audit_watch_inode(struct audit_watch *watch);
  extern dev_t audit_watch_dev(struct audit_watch *watch);
  extern void audit_put_watch(struct audit_watch *watch);
  extern void audit_get_watch(struct audit_watch *watch);
  extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);

  extern int audit_add_watch(struct audit_krule *krule);

  extern void audit_remove_watch(struct audit_watch *watch);
  extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
  extern void audit_inotify_unregister(struct list_head *in_list);
  extern char *audit_watch_path(struct audit_watch *watch);
  extern struct list_head *audit_watch_rules(struct audit_watch *watch);
  
  extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
  					   struct audit_watch *watch);

  #ifdef CONFIG_AUDIT_TREE
  extern struct audit_chunk *audit_tree_lookup(const struct inode *);
  extern void audit_put_chunk(struct audit_chunk *);
  extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
  extern int audit_make_tree(struct audit_krule *, char *, u32);
  extern int audit_add_tree_rule(struct audit_krule *);
  extern int audit_remove_tree_rule(struct audit_krule *);
  extern void audit_trim_trees(void);
  extern int audit_tag_tree(char *old, char *new);

  extern const char *audit_tree_path(struct audit_tree *);
  extern void audit_put_tree(struct audit_tree *);

  extern void audit_kill_trees(struct list_head *);

  #else
  #define audit_remove_tree_rule(rule) BUG()
  #define audit_add_tree_rule(rule) -EINVAL
  #define audit_make_tree(rule, str, op) -EINVAL
  #define audit_trim_trees() (void)0
  #define audit_put_tree(tree) (void)0
  #define audit_tag_tree(old, new) -EINVAL
  #define audit_tree_path(rule) ""	/* never called */

  #define audit_kill_trees(list) BUG()

  #endif
  
  extern char *audit_unpack_string(void **, size_t *, size_t);

  extern pid_t audit_sig_pid;
  extern uid_t audit_sig_uid;
  extern u32 audit_sig_sid;

  #ifdef CONFIG_AUDITSYSCALL

  extern int __audit_signal_info(int sig, struct task_struct *t);
  static inline int audit_signal_info(int sig, struct task_struct *t)

  {

  	if (unlikely((audit_pid && t->tgid == audit_pid) ||
  		     (audit_signals && !audit_dummy_context())))
  		return __audit_signal_info(sig, t);
  	return 0;

  }

  extern void audit_filter_inodes(struct task_struct *, struct audit_context *);

  extern struct list_head *audit_killed_trees(void);

  #else

  #define audit_signal_info(s,t) AUDIT_DISABLED

  #define audit_filter_inodes(t,c) AUDIT_DISABLED

  #endif

  
  extern struct mutex audit_cmd_mutex;