Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * 25-Jul-1998 Major changes to allow for ip chain table | |
3 | * | |
4 | * 3-Jan-2000 Named tables to allow packet selection for different uses. | |
5 | */ | |
6 | ||
7 | /* | |
8 | * Format of an IP firewall descriptor | |
9 | * | |
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. | |
13 | */ | |
14 | ||
15 | #ifndef _IPTABLES_H | |
16 | #define _IPTABLES_H | |
17 | ||
18 | #ifdef __KERNEL__ | |
19 | #include <linux/if.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/ip.h> | |
23 | #include <linux/skbuff.h> | |
24 | #endif | |
25 | #include <linux/compiler.h> | |
26 | #include <linux/netfilter_ipv4.h> | |
27 | ||
2e4e6a17 HW |
28 | #include <linux/netfilter/x_tables.h> |
29 | ||
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 | |
1da177e4 LT |
36 | |
37 | /* Yes, Virginia, you have to zero the padding. */ | |
38 | struct ipt_ip { | |
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]; | |
45 | ||
46 | /* Protocol, 0 = ANY */ | |
47 | u_int16_t proto; | |
48 | ||
49 | /* Flags word */ | |
50 | u_int8_t flags; | |
51 | /* Inverse flags */ | |
52 | u_int8_t invflags; | |
53 | }; | |
54 | ||
1e30a014 DM |
55 | #define ipt_entry_match xt_entry_match |
56 | #define ipt_entry_target xt_entry_target | |
57 | #define ipt_standard_target xt_standard_target | |
1da177e4 | 58 | |
2e4e6a17 | 59 | #define ipt_counters xt_counters |
1da177e4 LT |
60 | |
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 */ | |
05465343 PM |
63 | #define IPT_F_GOTO 0x02 /* Set if jump is a goto */ |
64 | #define IPT_F_MASK 0x03 /* All possible flag bits mask. */ | |
1da177e4 LT |
65 | |
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. */ | |
2e4e6a17 | 73 | #define IPT_INV_PROTO XT_INV_PROTO |
1da177e4 LT |
74 | #define IPT_INV_MASK 0x7F /* All possible flag bits mask. */ |
75 | ||
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 */ | |
79 | struct ipt_entry | |
80 | { | |
81 | struct ipt_ip ip; | |
82 | ||
83 | /* Mark with fields that we care about. */ | |
84 | unsigned int nfcache; | |
85 | ||
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; | |
90 | ||
91 | /* Back pointer */ | |
92 | unsigned int comefrom; | |
93 | ||
94 | /* Packet and byte counters. */ | |
2e4e6a17 | 95 | struct xt_counters counters; |
1da177e4 LT |
96 | |
97 | /* The matches (if any), then the target. */ | |
98 | unsigned char elems[0]; | |
99 | }; | |
100 | ||
101 | /* | |
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. */ | |
2e4e6a17 | 105 | #define IPT_BASE_CTL XT_BASE_CTL |
1da177e4 | 106 | |
2e4e6a17 HW |
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 | |
1da177e4 | 110 | |
2e4e6a17 HW |
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 | |
1da177e4 | 116 | |
2e4e6a17 HW |
117 | #define IPT_CONTINUE XT_CONTINUE |
118 | #define IPT_RETURN XT_RETURN | |
1da177e4 | 119 | |
2e4e6a17 HW |
120 | #include <linux/netfilter/xt_tcpudp.h> |
121 | #define ipt_udp xt_udp | |
122 | #define ipt_tcp xt_tcp | |
1da177e4 | 123 | |
2e4e6a17 HW |
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 | |
1da177e4 | 129 | |
2e4e6a17 HW |
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 | |
1da177e4 LT |
133 | |
134 | /* ICMP matching stuff */ | |
135 | struct ipt_icmp | |
136 | { | |
137 | u_int8_t type; /* type to match */ | |
138 | u_int8_t code[2]; /* range of code */ | |
139 | u_int8_t invflags; /* Inverse flags */ | |
140 | }; | |
141 | ||
142 | /* Values for "inv" field for struct ipt_icmp. */ | |
143 | #define IPT_ICMP_INV 0x01 /* Invert the sense of type/code test */ | |
144 | ||
145 | /* The argument to IPT_SO_GET_INFO */ | |
146 | struct ipt_getinfo | |
147 | { | |
148 | /* Which table: caller fills this in. */ | |
149 | char name[IPT_TABLE_MAXNAMELEN]; | |
150 | ||
151 | /* Kernel fills these in. */ | |
152 | /* Which hook entry points are valid: bitmask */ | |
153 | unsigned int valid_hooks; | |
154 | ||
155 | /* Hook entry points: one per netfilter hook. */ | |
156 | unsigned int hook_entry[NF_IP_NUMHOOKS]; | |
157 | ||
158 | /* Underflow points. */ | |
159 | unsigned int underflow[NF_IP_NUMHOOKS]; | |
160 | ||
161 | /* Number of entries */ | |
162 | unsigned int num_entries; | |
163 | ||
164 | /* Size of entries. */ | |
165 | unsigned int size; | |
166 | }; | |
167 | ||
168 | /* The argument to IPT_SO_SET_REPLACE. */ | |
169 | struct ipt_replace | |
170 | { | |
171 | /* Which table. */ | |
172 | char name[IPT_TABLE_MAXNAMELEN]; | |
173 | ||
174 | /* Which hook entry points are valid: bitmask. You can't | |
175 | change this. */ | |
176 | unsigned int valid_hooks; | |
177 | ||
178 | /* Number of entries */ | |
179 | unsigned int num_entries; | |
180 | ||
181 | /* Total size of new entries */ | |
182 | unsigned int size; | |
183 | ||
184 | /* Hook entry points. */ | |
185 | unsigned int hook_entry[NF_IP_NUMHOOKS]; | |
186 | ||
187 | /* Underflow points. */ | |
188 | unsigned int underflow[NF_IP_NUMHOOKS]; | |
189 | ||
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. */ | |
2e4e6a17 | 194 | struct xt_counters __user *counters; |
1da177e4 LT |
195 | |
196 | /* The entries (hang off end: not really an array). */ | |
197 | struct ipt_entry entries[0]; | |
198 | }; | |
199 | ||
200 | /* The argument to IPT_SO_ADD_COUNTERS. */ | |
2e4e6a17 | 201 | #define ipt_counters_info xt_counters_info |
1da177e4 LT |
202 | |
203 | /* The argument to IPT_SO_GET_ENTRIES. */ | |
204 | struct ipt_get_entries | |
205 | { | |
206 | /* Which table: user fills this in. */ | |
207 | char name[IPT_TABLE_MAXNAMELEN]; | |
208 | ||
209 | /* User fills this in: total entry size. */ | |
210 | unsigned int size; | |
211 | ||
212 | /* The entries. */ | |
213 | struct ipt_entry entrytable[0]; | |
214 | }; | |
215 | ||
1da177e4 | 216 | /* Standard return verdict, or do jump. */ |
2e4e6a17 | 217 | #define IPT_STANDARD_TARGET XT_STANDARD_TARGET |
1da177e4 | 218 | /* Error verdict. */ |
2e4e6a17 | 219 | #define IPT_ERROR_TARGET XT_ERROR_TARGET |
1da177e4 LT |
220 | |
221 | /* Helper functions */ | |
222 | static __inline__ struct ipt_entry_target * | |
223 | ipt_get_target(struct ipt_entry *e) | |
224 | { | |
225 | return (void *)e + e->target_offset; | |
226 | } | |
227 | ||
228 | /* fn returns 0 to continue iteration */ | |
229 | #define IPT_MATCH_ITERATE(e, fn, args...) \ | |
230 | ({ \ | |
231 | unsigned int __i; \ | |
232 | int __ret = 0; \ | |
233 | struct ipt_entry_match *__match; \ | |
234 | \ | |
235 | for (__i = sizeof(struct ipt_entry); \ | |
236 | __i < (e)->target_offset; \ | |
237 | __i += __match->u.match_size) { \ | |
238 | __match = (void *)(e) + __i; \ | |
239 | \ | |
240 | __ret = fn(__match , ## args); \ | |
241 | if (__ret != 0) \ | |
242 | break; \ | |
243 | } \ | |
244 | __ret; \ | |
245 | }) | |
246 | ||
247 | /* fn returns 0 to continue iteration */ | |
248 | #define IPT_ENTRY_ITERATE(entries, size, fn, args...) \ | |
249 | ({ \ | |
250 | unsigned int __i; \ | |
251 | int __ret = 0; \ | |
252 | struct ipt_entry *__entry; \ | |
253 | \ | |
254 | for (__i = 0; __i < (size); __i += __entry->next_offset) { \ | |
255 | __entry = (void *)(entries) + __i; \ | |
256 | \ | |
257 | __ret = fn(__entry , ## args); \ | |
258 | if (__ret != 0) \ | |
259 | break; \ | |
260 | } \ | |
261 | __ret; \ | |
262 | }) | |
263 | ||
264 | /* | |
265 | * Main firewall chains definitions and global var's definitions. | |
266 | */ | |
267 | #ifdef __KERNEL__ | |
268 | ||
269 | #include <linux/init.h> | |
270 | extern void ipt_init(void) __init; | |
271 | ||
a45049c5 PNA |
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) | |
276 | ||
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) | |
1da177e4 | 281 | |
2e4e6a17 HW |
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) | |
1da177e4 | 284 | |
2e4e6a17 HW |
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); | |
1da177e4 LT |
288 | |
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); | |
291 | ||
292 | /* Standard entry. */ | |
293 | struct ipt_standard | |
294 | { | |
295 | struct ipt_entry entry; | |
296 | struct ipt_standard_target target; | |
297 | }; | |
298 | ||
299 | struct ipt_error_target | |
300 | { | |
301 | struct ipt_entry_target target; | |
302 | char errorname[IPT_FUNCTION_MAXNAMELEN]; | |
303 | }; | |
304 | ||
305 | struct ipt_error | |
306 | { | |
307 | struct ipt_entry entry; | |
308 | struct ipt_error_target target; | |
309 | }; | |
310 | ||
1da177e4 LT |
311 | extern unsigned int ipt_do_table(struct sk_buff **pskb, |
312 | unsigned int hook, | |
313 | const struct net_device *in, | |
314 | const struct net_device *out, | |
fe1cb108 | 315 | struct ipt_table *table); |
1da177e4 | 316 | |
2e4e6a17 | 317 | #define IPT_ALIGN(s) XT_ALIGN(s) |
2722971c DM |
318 | |
319 | #ifdef CONFIG_COMPAT | |
320 | #include <net/compat.h> | |
321 | ||
322 | struct compat_ipt_entry | |
323 | { | |
324 | struct ipt_ip ip; | |
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]; | |
331 | }; | |
332 | ||
333 | #define COMPAT_IPT_ALIGN(s) COMPAT_XT_ALIGN(s) | |
334 | ||
335 | #endif /* CONFIG_COMPAT */ | |
1da177e4 LT |
336 | #endif /*__KERNEL__*/ |
337 | #endif /* _IPTABLES_H */ |