2 * 25-Jul-1998 Major changes to allow for ip chain table
4 * 3-Jan-2000 Named tables to allow packet selection for different uses.
8 * Format of an IP firewall descriptor
10 * src, dst, src_mask, dst_mask are always stored in network byte order.
11 * flags are stored in host byte order (of course).
12 * Port numbers are stored in HOST byte order.
20 #include <linux/types.h>
23 #include <linux/skbuff.h>
25 #include <linux/compiler.h>
26 #include <linux/netfilter_ipv4.h>
28 #include <linux/netfilter/x_tables.h>
30 #define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
31 #define IPT_TABLE_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
32 #define ipt_match xt_match
33 #define ipt_target xt_target
34 #define ipt_table xt_table
35 #define ipt_get_revision xt_get_revision
37 /* Yes, Virginia, you have to zero the padding. */
39 /* Source and destination IP addr */
40 struct in_addr src
, dst
;
41 /* Mask for src and dest IP addr */
42 struct in_addr smsk
, dmsk
;
43 char iniface
[IFNAMSIZ
], outiface
[IFNAMSIZ
];
44 unsigned char iniface_mask
[IFNAMSIZ
], outiface_mask
[IFNAMSIZ
];
46 /* Protocol, 0 = ANY */
55 #define ipt_entry_match xt_entry_match
56 #define ipt_entry_target xt_entry_target
57 #define ipt_standard_target xt_standard_target
59 #define ipt_counters xt_counters
61 /* Values for "flag" field in struct ipt_ip (general ip structure). */
62 #define IPT_F_FRAG 0x01 /* Set if rule is a fragment rule */
63 #define IPT_F_GOTO 0x02 /* Set if jump is a goto */
64 #define IPT_F_MASK 0x03 /* All possible flag bits mask. */
66 /* Values for "inv" field in struct ipt_ip. */
67 #define IPT_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */
68 #define IPT_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */
69 #define IPT_INV_TOS 0x04 /* Invert the sense of TOS. */
70 #define IPT_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */
71 #define IPT_INV_DSTIP 0x10 /* Invert the sense of DST OP. */
72 #define IPT_INV_FRAG 0x20 /* Invert the sense of FRAG. */
73 #define IPT_INV_PROTO XT_INV_PROTO
74 #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */
76 /* This structure defines each of the firewall rules. Consists of 3
77 parts which are 1) general IP header stuff 2) match specific
78 stuff 3) the target to perform if the rule matches */
83 /* Mark with fields that we care about. */
86 /* Size of ipt_entry + matches */
87 u_int16_t target_offset
;
88 /* Size of ipt_entry + matches + target */
89 u_int16_t next_offset
;
92 unsigned int comefrom
;
94 /* Packet and byte counters. */
95 struct xt_counters counters
;
97 /* The matches (if any), then the target. */
98 unsigned char elems
[0];
102 * New IP firewall options for [gs]etsockopt at the RAW IP level.
103 * Unlike BSD Linux inherits IP options so you don't have to use a raw
104 * socket for this. Instead we check rights in the calls. */
105 #define IPT_BASE_CTL XT_BASE_CTL
107 #define IPT_SO_SET_REPLACE XT_SO_SET_REPLACE
108 #define IPT_SO_SET_ADD_COUNTERS XT_SO_SET_ADD_COUNTERS
109 #define IPT_SO_SET_MAX XT_SO_SET_MAX
111 #define IPT_SO_GET_INFO XT_SO_GET_INFO
112 #define IPT_SO_GET_ENTRIES XT_SO_GET_ENTRIES
113 #define IPT_SO_GET_REVISION_MATCH XT_SO_GET_REVISION_MATCH
114 #define IPT_SO_GET_REVISION_TARGET XT_SO_GET_REVISION_TARGET
115 #define IPT_SO_GET_MAX XT_SO_GET_REVISION_TARGET
117 #define IPT_CONTINUE XT_CONTINUE
118 #define IPT_RETURN XT_RETURN
120 #include <linux/netfilter/xt_tcpudp.h>
121 #define ipt_udp xt_udp
122 #define ipt_tcp xt_tcp
124 #define IPT_TCP_INV_SRCPT XT_TCP_INV_SRCPT
125 #define IPT_TCP_INV_DSTPT XT_TCP_INV_DSTPT
126 #define IPT_TCP_INV_FLAGS XT_TCP_INV_FLAGS
127 #define IPT_TCP_INV_OPTION XT_TCP_INV_OPTION
128 #define IPT_TCP_INV_MASK XT_TCP_INV_MASK
130 #define IPT_UDP_INV_SRCPT XT_UDP_INV_SRCPT
131 #define IPT_UDP_INV_DSTPT XT_UDP_INV_DSTPT
132 #define IPT_UDP_INV_MASK XT_UDP_INV_MASK
134 /* ICMP matching stuff */
137 u_int8_t type
; /* type to match */
138 u_int8_t code
[2]; /* range of code */
139 u_int8_t invflags
; /* Inverse flags */
142 /* Values for "inv" field for struct ipt_icmp. */
143 #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */
145 /* The argument to IPT_SO_GET_INFO */
148 /* Which table: caller fills this in. */
149 char name
[IPT_TABLE_MAXNAMELEN
];
151 /* Kernel fills these in. */
152 /* Which hook entry points are valid: bitmask */
153 unsigned int valid_hooks
;
155 /* Hook entry points: one per netfilter hook. */
156 unsigned int hook_entry
[NF_IP_NUMHOOKS
];
158 /* Underflow points. */
159 unsigned int underflow
[NF_IP_NUMHOOKS
];
161 /* Number of entries */
162 unsigned int num_entries
;
164 /* Size of entries. */
168 /* The argument to IPT_SO_SET_REPLACE. */
172 char name
[IPT_TABLE_MAXNAMELEN
];
174 /* Which hook entry points are valid: bitmask. You can't
176 unsigned int valid_hooks
;
178 /* Number of entries */
179 unsigned int num_entries
;
181 /* Total size of new entries */
184 /* Hook entry points. */
185 unsigned int hook_entry
[NF_IP_NUMHOOKS
];
187 /* Underflow points. */
188 unsigned int underflow
[NF_IP_NUMHOOKS
];
190 /* Information about old entries: */
191 /* Number of counters (must be equal to current number of entries). */
192 unsigned int num_counters
;
193 /* The old entries' counters. */
194 struct xt_counters __user
*counters
;
196 /* The entries (hang off end: not really an array). */
197 struct ipt_entry entries
[0];
200 /* The argument to IPT_SO_ADD_COUNTERS. */
201 #define ipt_counters_info xt_counters_info
203 /* The argument to IPT_SO_GET_ENTRIES. */
204 struct ipt_get_entries
206 /* Which table: user fills this in. */
207 char name
[IPT_TABLE_MAXNAMELEN
];
209 /* User fills this in: total entry size. */
213 struct ipt_entry entrytable
[0];
216 /* Standard return verdict, or do jump. */
217 #define IPT_STANDARD_TARGET XT_STANDARD_TARGET
219 #define IPT_ERROR_TARGET XT_ERROR_TARGET
221 /* Helper functions */
222 static __inline__
struct ipt_entry_target
*
223 ipt_get_target(struct ipt_entry
*e
)
225 return (void *)e
+ e
->target_offset
;
228 /* fn returns 0 to continue iteration */
229 #define IPT_MATCH_ITERATE(e, fn, args...) \
233 struct ipt_entry_match *__match; \
235 for (__i = sizeof(struct ipt_entry); \
236 __i < (e)->target_offset; \
237 __i += __match->u.match_size) { \
238 __match = (void *)(e) + __i; \
240 __ret = fn(__match , ## args); \
247 /* fn returns 0 to continue iteration */
248 #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
252 struct ipt_entry *__entry; \
254 for (__i = 0; __i < (size); __i += __entry->next_offset) { \
255 __entry = (void *)(entries) + __i; \
257 __ret = fn(__entry , ## args); \
265 * Main firewall chains definitions and global var's definitions.
269 #include <linux/init.h>
270 extern void ipt_init(void) __init
;
272 #define ipt_register_target(tgt) \
273 ({ (tgt)->family = AF_INET; \
274 xt_register_target(tgt); })
275 #define ipt_unregister_target(tgt) xt_unregister_target(tgt)
277 #define ipt_register_match(mtch) \
278 ({ (mtch)->family = AF_INET; \
279 xt_register_match(mtch); })
280 #define ipt_unregister_match(mtch) xt_unregister_match(mtch)
282 //#define ipt_register_table(tbl, repl) xt_register_table(AF_INET, tbl, repl)
283 //#define ipt_unregister_table(tbl) xt_unregister_table(AF_INET, tbl)
285 extern int ipt_register_table(struct ipt_table
*table
,
286 const struct ipt_replace
*repl
);
287 extern void ipt_unregister_table(struct ipt_table
*table
);
289 /* net/sched/ipt.c: Gimme access to your targets! Gets target->me. */
290 extern struct ipt_target
*ipt_find_target(const char *name
, u8 revision
);
292 /* Standard entry. */
295 struct ipt_entry entry
;
296 struct ipt_standard_target target
;
299 struct ipt_error_target
301 struct ipt_entry_target target
;
302 char errorname
[IPT_FUNCTION_MAXNAMELEN
];
307 struct ipt_entry entry
;
308 struct ipt_error_target target
;
311 extern unsigned int ipt_do_table(struct sk_buff
**pskb
,
313 const struct net_device
*in
,
314 const struct net_device
*out
,
315 struct ipt_table
*table
);
317 #define IPT_ALIGN(s) XT_ALIGN(s)
320 #include <net/compat.h>
322 struct compat_ipt_entry
325 compat_uint_t nfcache
;
326 u_int16_t target_offset
;
327 u_int16_t next_offset
;
328 compat_uint_t comefrom
;
329 struct compat_xt_counters counters
;
330 unsigned char elems
[0];
333 #define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s)
335 #endif /* CONFIG_COMPAT */
336 #endif /*__KERNEL__*/
337 #endif /* _IPTABLES_H */