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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor policy loading interface function definitions.
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
9 */
10
11#ifndef __POLICY_INTERFACE_H
12#define __POLICY_INTERFACE_H
13
14#include <linux/list.h>
15#include <linux/kref.h>
16#include <linux/dcache.h>
17#include <linux/workqueue.h>
18
19struct aa_load_ent {
20 struct list_head list;
21 struct aa_profile *new;
22 struct aa_profile *old;
23 struct aa_profile *rename;
24 const char *ns_name;
25};
26
27void aa_load_ent_free(struct aa_load_ent *ent);
28struct aa_load_ent *aa_load_ent_alloc(void);
29
30#define PACKED_FLAG_HAT 1
31
32#define PACKED_MODE_ENFORCE 0
33#define PACKED_MODE_COMPLAIN 1
34#define PACKED_MODE_KILL 2
35#define PACKED_MODE_UNCONFINED 3
36
37struct aa_ns;
38
39enum {
40 AAFS_LOADDATA_ABI = 0,
41 AAFS_LOADDATA_REVISION,
42 AAFS_LOADDATA_HASH,
43 AAFS_LOADDATA_DATA,
44 AAFS_LOADDATA_COMPRESSED_SIZE,
45 AAFS_LOADDATA_DIR, /* must be last actual entry */
46 AAFS_LOADDATA_NDENTS /* count of entries */
47};
48
49/*
50 * struct aa_loaddata - buffer of policy raw_data set
51 *
52 * there is no loaddata ref for being on ns list, nor a ref from
53 * d_inode(@dentry) when grab a ref from these, @ns->lock must be held
54 * && __aa_get_loaddata() needs to be used, and the return value
55 * checked, if NULL the loaddata is already being reaped and should be
56 * considered dead.
57 */
58struct aa_loaddata {
59 struct kref count;
60 struct list_head list;
61 struct work_struct work;
62 struct dentry *dents[AAFS_LOADDATA_NDENTS];
63 struct aa_ns *ns;
64 char *name;
65 size_t size; /* the original size of the payload */
66 size_t compressed_size; /* the compressed size of the payload */
67 long revision; /* the ns policy revision this caused */
68 int abi;
69 unsigned char *hash;
70
71 /* Pointer to payload. If @compressed_size > 0, then this is the
72 * compressed version of the payload, else it is the uncompressed
73 * version (with the size indicated by @size).
74 */
75 char *data;
76};
77
78int aa_unpack(struct aa_loaddata *udata, struct list_head *lh, const char **ns);
79
80/**
81 * __aa_get_loaddata - get a reference count to uncounted data reference
82 * @data: reference to get a count on
83 *
84 * Returns: pointer to reference OR NULL if race is lost and reference is
85 * being repeated.
86 * Requires: @data->ns->lock held, and the return code MUST be checked
87 *
88 * Use only from inode->i_private and @data->list found references
89 */
90static inline struct aa_loaddata *
91__aa_get_loaddata(struct aa_loaddata *data)
92{
93 if (data && kref_get_unless_zero(&(data->count)))
94 return data;
95
96 return NULL;
97}
98
99/**
100 * aa_get_loaddata - get a reference count from a counted data reference
101 * @data: reference to get a count on
102 *
103 * Returns: point to reference
104 * Requires: @data to have a valid reference count on it. It is a bug
105 * if the race to reap can be encountered when it is used.
106 */
107static inline struct aa_loaddata *
108aa_get_loaddata(struct aa_loaddata *data)
109{
110 struct aa_loaddata *tmp = __aa_get_loaddata(data);
111
112 AA_BUG(data && !tmp);
113
114 return tmp;
115}
116
117void __aa_loaddata_update(struct aa_loaddata *data, long revision);
118bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r);
119void aa_loaddata_kref(struct kref *kref);
120struct aa_loaddata *aa_loaddata_alloc(size_t size);
121static inline void aa_put_loaddata(struct aa_loaddata *data)
122{
123 if (data)
124 kref_put(&data->count, aa_loaddata_kref);
125}
126
127#endif /* __POLICY_INTERFACE_H */