x_tables.h revision dcfb7a77f8709125e97c313cb8ab6ec4d87468f4 
1#ifndef _X_TABLES_H
2#define _X_TABLES_H
3
4#include <linux/types.h>
5
6#define XT_FUNCTION_MAXNAMELEN 30
7#define XT_TABLE_MAXNAMELEN 32
8
9struct xt_entry_match
10{
11	union {
12		struct {
13			__u16 match_size;
14
15			/* Used by userspace */
16			char name[XT_FUNCTION_MAXNAMELEN-1];
17
18			__u8 revision;
19		} user;
20		struct {
21			__u16 match_size;
22
23			/* Used inside the kernel */
24			struct xt_match *match;
25		} kernel;
26
27		/* Total length */
28		__u16 match_size;
29	} u;
30
31	unsigned char data[0];
32};
33
34struct xt_entry_target
35{
36	union {
37		struct {
38			__u16 target_size;
39
40			/* Used by userspace */
41			char name[XT_FUNCTION_MAXNAMELEN-1];
42
43			__u8 revision;
44		} user;
45		struct {
46			__u16 target_size;
47
48			/* Used inside the kernel */
49			struct xt_target *target;
50		} kernel;
51
52		/* Total length */
53		__u16 target_size;
54	} u;
55
56	unsigned char data[0];
57};
58
59#define XT_TARGET_INIT(__name, __size)					       \
60{									       \
61	.target.u.user = {						       \
62		.target_size	= XT_ALIGN(__size),			       \
63		.name		= __name,				       \
64	},								       \
65}
66
67struct xt_standard_target
68{
69	struct xt_entry_target target;
70	int verdict;
71};
72
73/* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
74 * kernel supports, if >= revision. */
75struct xt_get_revision
76{
77	char name[XT_FUNCTION_MAXNAMELEN-1];
78
79	__u8 revision;
80};
81
82/* CONTINUE verdict for targets */
83#define XT_CONTINUE 0xFFFFFFFF
84
85/* For standard target */
86#define XT_RETURN (-NF_REPEAT - 1)
87
88/* this is a dummy structure to find out the alignment requirement for a struct
89 * containing all the fundamental data types that are used in ipt_entry,
90 * ip6t_entry and arpt_entry.  This sucks, and it is a hack.  It will be my
91 * personal pleasure to remove it -HW
92 */
93struct _xt_align
94{
95	__u8 u8;
96	__u16 u16;
97	__u32 u32;
98	__u64 u64;
99};
100
101#define XT_ALIGN(s) (((s) + (__alignof__(struct _xt_align)-1)) 	\
102			& ~(__alignof__(struct _xt_align)-1))
103
104/* Standard return verdict, or do jump. */
105#define XT_STANDARD_TARGET ""
106/* Error verdict. */
107#define XT_ERROR_TARGET "ERROR"
108
109#define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
110#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
111
112struct xt_counters
113{
114	__u64 pcnt, bcnt;			/* Packet and byte counters */
115};
116
117/* The argument to IPT_SO_ADD_COUNTERS. */
118struct xt_counters_info
119{
120	/* Which table. */
121	char name[XT_TABLE_MAXNAMELEN];
122
123	unsigned int num_counters;
124
125	/* The counters (actually `number' of these). */
126	struct xt_counters counters[0];
127};
128
129#define XT_INV_PROTO		0x40	/* Invert the sense of PROTO. */
130
131/* fn returns 0 to continue iteration */
132#define XT_MATCH_ITERATE(type, e, fn, args...)			\
133({								\
134	unsigned int __i;					\
135	int __ret = 0;						\
136	struct xt_entry_match *__m;				\
137								\
138	for (__i = sizeof(type);				\
139	     __i < (e)->target_offset;				\
140	     __i += __m->u.match_size) {			\
141		__m = (void *)e + __i;				\
142								\
143		__ret = fn(__m , ## args);			\
144		if (__ret != 0)					\
145			break;					\
146	}							\
147	__ret;							\
148})
149
150/* fn returns 0 to continue iteration */
151#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
152({								\
153	unsigned int __i, __n;					\
154	int __ret = 0;						\
155	type *__entry;						\
156								\
157	for (__i = 0, __n = 0; __i < (size);			\
158	     __i += __entry->next_offset, __n++) { 		\
159		__entry = (void *)(entries) + __i;		\
160		if (__n < n)					\
161			continue;				\
162								\
163		__ret = fn(__entry , ## args);			\
164		if (__ret != 0)					\
165			break;					\
166	}							\
167	__ret;							\
168})
169
170/* fn returns 0 to continue iteration */
171#define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
172	XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
173
174
175#endif /* _X_TABLES_H */
176