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001: #ifndef _X_TABLES_H
002: #define _X_TABLES_H
003: #include <linux/kernel.h>
004: #include <linux/types.h>
005: 
006: #define XT_FUNCTION_MAXNAMELEN 30
007: #define XT_EXTENSION_MAXNAMELEN 29
008: #define XT_TABLE_MAXNAMELEN 32
009: 
010: struct xt_entry_match {
011:         union {
012:                 struct {
013:                         __u16 match_size;
014: 
015:                         /* Used by userspace */
016:                         char name[XT_EXTENSION_MAXNAMELEN];
017:                         __u8 revision;
018:                 } user;
019:                 struct {
020:                         __u16 match_size;
021: 
022:                         /* Used inside the kernel */
023:                         struct xt_match *match;
024:                 } kernel;
025: 
026:                 /* Total length */
027:                 __u16 match_size;
028:         } u;
029: 
030:         unsigned char data[0];
031: };
032: 
033: struct xt_entry_target {
034:         union {
035:                 struct {
036:                         __u16 target_size;
037: 
038:                         /* Used by userspace */
039:                         char name[XT_EXTENSION_MAXNAMELEN];
040:                         __u8 revision;
041:                 } user;
042:                 struct {
043:                         __u16 target_size;
044: 
045:                         /* Used inside the kernel */
046:                         struct xt_target *target;
047:                 } kernel;
048: 
049:                 /* Total length */
050:                 __u16 target_size;
051:         } u;
052: 
053:         unsigned char data[0];
054: };
055: 
056: #define XT_TARGET_INIT(__name, __size)                                         \
057: {                                                                              \
058:         .target.u.user = {                                                     \
059:                 .target_size    = XT_ALIGN(__size),                            \
060:                 .name           = __name,                                      \
061:         },                                                                     \
062: }
063: 
064: struct xt_standard_target {
065:         struct xt_entry_target target;
066:         int verdict;
067: };
068: 
069: struct xt_error_target {
070:         struct xt_entry_target target;
071:         char errorname[XT_FUNCTION_MAXNAMELEN];
072: };
073: 
074: /* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
075:  * kernel supports, if >= revision. */
076: struct xt_get_revision {
077:         char name[XT_EXTENSION_MAXNAMELEN];
078:         __u8 revision;
079: };
080: 
081: /* CONTINUE verdict for targets */
082: #define XT_CONTINUE 0xFFFFFFFF
083: 
084: /* For standard target */
085: #define XT_RETURN (-NF_REPEAT - 1)
086: 
087: /* this is a dummy structure to find out the alignment requirement for a struct
088:  * containing all the fundamental data types that are used in ipt_entry,
089:  * ip6t_entry and arpt_entry.  This sucks, and it is a hack.  It will be my
090:  * personal pleasure to remove it -HW
091:  */
092: struct _xt_align {
093:         __u8 u8;
094:         __u16 u16;
095:         __u32 u32;
096:         __u64 u64;
097: };
098: 
099: #define XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _xt_align))
100: 
101: /* Standard return verdict, or do jump. */
102: #define XT_STANDARD_TARGET ""
103: /* Error verdict. */
104: #define XT_ERROR_TARGET "ERROR"
105: 
106: #define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
107: #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
108: 
109: struct xt_counters {
110:         __u64 pcnt, bcnt;                       /* Packet and byte counters */
111: };
112: 
113: /* The argument to IPT_SO_ADD_COUNTERS. */
114: struct xt_counters_info {
115:         /* Which table. */
116:         char name[XT_TABLE_MAXNAMELEN];
117: 
118:         unsigned int num_counters;
119: 
120:         /* The counters (actually `number' of these). */
121:         struct xt_counters counters[0];
122: };
123: 
124: #define XT_INV_PROTO            0x40    /* Invert the sense of PROTO. */
125: 
126: /* fn returns 0 to continue iteration */
127: #define XT_MATCH_ITERATE(type, e, fn, args...)                  \
128: ({                                                              \
129:         unsigned int __i;                                       \
130:         int __ret = 0;                                          \
131:         struct xt_entry_match *__m;                             \
132:                                                                 \
133:         for (__i = sizeof(type);                                \
134:              __i < (e)->target_offset;                          \
135:              __i += __m->u.match_size) {                        \
136:                 __m = (void *)e + __i;                          \
137:                                                                 \
138:                 __ret = fn(__m , ## args);                      \
139:                 if (__ret != 0)                                 \
140:                         break;                                  \
141:         }                                                       \
142:         __ret;                                                  \
143: })
144: 
145: /* fn returns 0 to continue iteration */
146: #define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
147: ({                                                              \
148:         unsigned int __i, __n;                                  \
149:         int __ret = 0;                                          \
150:         type *__entry;                                          \
151:                                                                 \
152:         for (__i = 0, __n = 0; __i < (size);                    \
153:              __i += __entry->next_offset, __n++) {              \
154:                 __entry = (void *)(entries) + __i;              \
155:                 if (__n < n)                                    \
156:                         continue;                               \
157:                                                                 \
158:                 __ret = fn(__entry , ## args);                  \
159:                 if (__ret != 0)                                 \
160:                         break;                                  \
161:         }                                                       \
162:         __ret;                                                  \
163: })
164: 
165: /* fn returns 0 to continue iteration */
166: #define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
167:         XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
168: 
169: 
170: /* pos is normally a struct ipt_entry/ip6t_entry/etc. */
171: #define xt_entry_foreach(pos, ehead, esize) \
172:         for ((pos) = (typeof(pos))(ehead); \
173:              (pos) < (typeof(pos))((char *)(ehead) + (esize)); \
174:              (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))
175: 
176: /* can only be xt_entry_match, so no use of typeof here */
177: #define xt_ematch_foreach(pos, entry) \
178:         for ((pos) = (struct xt_entry_match *)entry->elems; \
179:              (pos) < (struct xt_entry_match *)((char *)(entry) + \
180:                      (entry)->target_offset); \
181:              (pos) = (struct xt_entry_match *)((char *)(pos) + \
182:                      (pos)->u.match_size))
183: 
184: 
185: #endif /* _X_TABLES_H */
186: 

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