LXR linux/security/apparmor/include/policy

   1/*
   2 * AppArmor security module
   3 *
   4 * This file contains AppArmor policy loading interface function definitions.
   5 *
   6 * Copyright (C) 1998-2008 Novell/SUSE
   7 * Copyright 2009-2010 Canonical Ltd.
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License as
  11 * published by the Free Software Foundation, version 2 of the
  12 * License.
  13 */
  14
  15#ifndef __POLICY_INTERFACE_H
  16#define __POLICY_INTERFACE_H
  17
  18#include <linux/list.h>
  19#include <linux/kref.h>
  20#include <linux/dcache.h>
  21#include <linux/workqueue.h>
  22
  23struct aa_load_ent {
  24        struct list_head list;
  25        struct aa_profile *new;
  26        struct aa_profile *old;
  27        struct aa_profile *rename;
  28        const char *ns_name;
  29};
  30
  31void aa_load_ent_free(struct aa_load_ent *ent);
  32struct aa_load_ent *aa_load_ent_alloc(void);
  33
  34#define PACKED_FLAG_HAT         1
  35
  36#define PACKED_MODE_ENFORCE     0
  37#define PACKED_MODE_COMPLAIN    1
  38#define PACKED_MODE_KILL        2
  39#define PACKED_MODE_UNCONFINED  3
  40
  41struct aa_ns;
  42
  43enum {
  44        AAFS_LOADDATA_ABI = 0,
  45        AAFS_LOADDATA_REVISION,
  46        AAFS_LOADDATA_HASH,
  47        AAFS_LOADDATA_DATA,
  48        AAFS_LOADDATA_DIR,              /* must be last actual entry */
  49        AAFS_LOADDATA_NDENTS            /* count of entries */
  50};
  51
  52/*
  53 * struct aa_loaddata - buffer of policy raw_data set
  54 *
  55 * there is no loaddata ref for being on ns list, nor a ref from
  56 * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
  57 * && __aa_get_loaddata() needs to be used, and the return value
  58 * checked, if NULL the loaddata is already being reaped and should be
  59 * considered dead.
  60 */
  61struct aa_loaddata {
  62        struct kref count;
  63        struct list_head list;
  64        struct work_struct work;
  65        struct dentry *dents[AAFS_LOADDATA_NDENTS];
  66        struct aa_ns *ns;
  67        char *name;
  68        size_t size;
  69        long revision;                  /* the ns policy revision this caused */
  70        int abi;
  71        unsigned char *hash;
  72
  73        char data[];
  74};
  75
  76int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
  77
  78/**
  79 * __aa_get_loaddata - get a reference count to uncounted data reference
  80 * @data: reference to get a count on
  81 *
  82 * Returns: pointer to reference OR NULL if race is lost and reference is
  83 *          being repeated.
  84 * Requires: @data->ns->lock held, and the return code MUST be checked
  85 *
  86 * Use only from inode->i_private and @data->list found references
  87 */
  88static inline struct aa_loaddata *
  89__aa_get_loaddata(struct aa_loaddata *data)
  90{
  91        if (data && kref_get_unless_zero(&(data->count)))
  92                return data;
  93
  94        return NULL;
  95}
  96
  97/**
  98 * aa_get_loaddata - get a reference count from a counted data reference
  99 * @data: reference to get a count on
 100 *
 101 * Returns: point to reference
 102 * Requires: @data to have a valid reference count on it. It is a bug
 103 *           if the race to reap can be encountered when it is used.
 104 */
 105static inline struct aa_loaddata *
 106aa_get_loaddata(struct aa_loaddata *data)
 107{
 108        struct aa_loaddata *tmp = __aa_get_loaddata(data);
 109
 110        AA_BUG(data && !tmp);
 111
 112        return tmp;
 113}
 114
 115void __aa_loaddata_update(struct aa_loaddata *data, long revision);
 116bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
 117void aa_loaddata_kref(struct kref *kref);
 118struct aa_loaddata *aa_loaddata_alloc(size_t size);
 119static inline void aa_put_loaddata(struct aa_loaddata *data)
 120{
 121        if (data)
 122                kref_put(&data->count, aa_loaddata_kref);
 123}
 124
 125#endif /* __POLICY_INTERFACE_H */
 126