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11#ifndef __AA_MATCH_H
12#define __AA_MATCH_H
13
14#include <linux/kref.h>
15
16#define DFA_NOMATCH 0
17#define DFA_START 1
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38#define YYTH_MAGIC 0x1B5E783D
39#define YYTH_FLAG_DIFF_ENCODE 1
40#define YYTH_FLAG_OOB_TRANS 2
41#define YYTH_FLAGS (YYTH_FLAG_DIFF_ENCODE | YYTH_FLAG_OOB_TRANS)
42
43#define MAX_OOB_SUPPORTED 1
44
45struct table_set_header {
46 u32 th_magic;
47 u32 th_hsize;
48 u32 th_ssize;
49 u16 th_flags;
50 char th_version[];
51};
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56
57#define YYTD_ID_ACCEPT 0
58#define YYTD_ID_BASE 1
59#define YYTD_ID_CHK 2
60#define YYTD_ID_DEF 3
61#define YYTD_ID_EC 4
62#define YYTD_ID_META 5
63#define YYTD_ID_ACCEPT2 6
64#define YYTD_ID_NXT 7
65#define YYTD_ID_TSIZE 8
66#define YYTD_ID_MAX 8
67
68#define YYTD_DATA8 1
69#define YYTD_DATA16 2
70#define YYTD_DATA32 4
71#define YYTD_DATA64 8
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75
76#define ACCEPT1_FLAGS(X) ((X) & 0x3f)
77#define ACCEPT2_FLAGS(X) ACCEPT1_FLAGS((X) >> YYTD_ID_ACCEPT2)
78#define TO_ACCEPT1_FLAG(X) ACCEPT1_FLAGS(X)
79#define TO_ACCEPT2_FLAG(X) (ACCEPT1_FLAGS(X) << YYTD_ID_ACCEPT2)
80#define DFA_FLAG_VERIFY_STATES 0x1000
81
82struct table_header {
83 u16 td_id;
84 u16 td_flags;
85 u32 td_hilen;
86 u32 td_lolen;
87 char td_data[];
88};
89
90#define DEFAULT_TABLE(DFA) ((u16 *)((DFA)->tables[YYTD_ID_DEF]->td_data))
91#define BASE_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_BASE]->td_data))
92#define NEXT_TABLE(DFA) ((u16 *)((DFA)->tables[YYTD_ID_NXT]->td_data))
93#define CHECK_TABLE(DFA) ((u16 *)((DFA)->tables[YYTD_ID_CHK]->td_data))
94#define EQUIV_TABLE(DFA) ((u8 *)((DFA)->tables[YYTD_ID_EC]->td_data))
95#define ACCEPT_TABLE(DFA) ((u32 *)((DFA)->tables[YYTD_ID_ACCEPT]->td_data))
96#define ACCEPT_TABLE2(DFA) ((u32 *)((DFA)->tables[YYTD_ID_ACCEPT2]->td_data))
97
98struct aa_dfa {
99 struct kref count;
100 u16 flags;
101 u32 max_oob;
102 struct table_header *tables[YYTD_ID_TSIZE];
103};
104
105extern struct aa_dfa *nulldfa;
106extern struct aa_dfa *stacksplitdfa;
107
108#define byte_to_byte(X) (X)
109
110#define UNPACK_ARRAY(TABLE, BLOB, LEN, TTYPE, BTYPE, NTOHX) \
111 do { \
112 typeof(LEN) __i; \
113 TTYPE *__t = (TTYPE *) TABLE; \
114 BTYPE *__b = (BTYPE *) BLOB; \
115 for (__i = 0; __i < LEN; __i++) { \
116 __t[__i] = NTOHX(__b[__i]); \
117 } \
118 } while (0)
119
120static inline size_t table_size(size_t len, size_t el_size)
121{
122 return ALIGN(sizeof(struct table_header) + len * el_size, 8);
123}
124
125int aa_setup_dfa_engine(void);
126void aa_teardown_dfa_engine(void);
127
128struct aa_dfa *aa_dfa_unpack(void *blob, size_t size, int flags);
129unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start,
130 const char *str, int len);
131unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start,
132 const char *str);
133unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state,
134 const char c);
135unsigned int aa_dfa_outofband_transition(struct aa_dfa *dfa,
136 unsigned int state);
137unsigned int aa_dfa_match_until(struct aa_dfa *dfa, unsigned int start,
138 const char *str, const char **retpos);
139unsigned int aa_dfa_matchn_until(struct aa_dfa *dfa, unsigned int start,
140 const char *str, int n, const char **retpos);
141
142void aa_dfa_free_kref(struct kref *kref);
143
144#define WB_HISTORY_SIZE 24
145struct match_workbuf {
146 unsigned int count;
147 unsigned int pos;
148 unsigned int len;
149 unsigned int size;
150 unsigned int history[WB_HISTORY_SIZE];
151};
152#define DEFINE_MATCH_WB(N) \
153struct match_workbuf N = { \
154 .count = 0, \
155 .pos = 0, \
156 .len = 0, \
157}
158
159unsigned int aa_dfa_leftmatch(struct aa_dfa *dfa, unsigned int start,
160 const char *str, unsigned int *count);
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169static inline struct aa_dfa *aa_get_dfa(struct aa_dfa *dfa)
170{
171 if (dfa)
172 kref_get(&(dfa->count));
173
174 return dfa;
175}
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183static inline void aa_put_dfa(struct aa_dfa *dfa)
184{
185 if (dfa)
186 kref_put(&dfa->count, aa_dfa_free_kref);
187}
188
189#define MATCH_FLAG_DIFF_ENCODE 0x80000000
190#define MARK_DIFF_ENCODE 0x40000000
191#define MATCH_FLAG_OOB_TRANSITION 0x20000000
192#define MATCH_FLAGS_MASK 0xff000000
193#define MATCH_FLAGS_VALID (MATCH_FLAG_DIFF_ENCODE | MATCH_FLAG_OOB_TRANSITION)
194#define MATCH_FLAGS_INVALID (MATCH_FLAGS_MASK & ~MATCH_FLAGS_VALID)
195
196#endif
197