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Commit | Line | Data |
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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 IP6 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 _IP6_TABLES_H | |
16 | #define _IP6_TABLES_H | |
17 | ||
18 | #ifdef __KERNEL__ | |
19 | #include <linux/if.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/in6.h> | |
22 | #include <linux/ipv6.h> | |
23 | #include <linux/skbuff.h> | |
24 | #endif | |
25 | #include <linux/compiler.h> | |
26 | #include <linux/netfilter_ipv6.h> | |
27 | ||
28 | #define IP6T_FUNCTION_MAXNAMELEN 30 | |
29 | #define IP6T_TABLE_MAXNAMELEN 32 | |
30 | ||
31 | /* Yes, Virginia, you have to zero the padding. */ | |
32 | struct ip6t_ip6 { | |
33 | /* Source and destination IP6 addr */ | |
34 | struct in6_addr src, dst; | |
35 | /* Mask for src and dest IP6 addr */ | |
36 | struct in6_addr smsk, dmsk; | |
37 | char iniface[IFNAMSIZ], outiface[IFNAMSIZ]; | |
38 | unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ]; | |
39 | ||
40 | /* ARGH, HopByHop uses 0, so can't do 0 = ANY, | |
41 | instead IP6T_F_NOPROTO must be set */ | |
42 | u_int16_t proto; | |
43 | /* TOS to match iff flags & IP6T_F_TOS */ | |
44 | u_int8_t tos; | |
45 | ||
46 | /* Flags word */ | |
47 | u_int8_t flags; | |
48 | /* Inverse flags */ | |
49 | u_int8_t invflags; | |
50 | }; | |
51 | ||
52 | /* FIXME: If alignment in kernel different from userspace? --RR */ | |
53 | struct ip6t_entry_match | |
54 | { | |
55 | union { | |
56 | struct { | |
57 | u_int16_t match_size; | |
58 | ||
59 | /* Used by userspace */ | |
60 | char name[IP6T_FUNCTION_MAXNAMELEN]; | |
61 | } user; | |
62 | struct { | |
63 | u_int16_t match_size; | |
64 | ||
65 | /* Used inside the kernel */ | |
66 | struct ip6t_match *match; | |
67 | } kernel; | |
68 | ||
69 | /* Total length */ | |
70 | u_int16_t match_size; | |
71 | } u; | |
72 | ||
73 | unsigned char data[0]; | |
74 | }; | |
75 | ||
76 | struct ip6t_entry_target | |
77 | { | |
78 | union { | |
79 | struct { | |
80 | u_int16_t target_size; | |
81 | ||
82 | /* Used by userspace */ | |
83 | char name[IP6T_FUNCTION_MAXNAMELEN]; | |
84 | } user; | |
85 | struct { | |
86 | u_int16_t target_size; | |
87 | ||
88 | /* Used inside the kernel */ | |
89 | struct ip6t_target *target; | |
90 | } kernel; | |
91 | ||
92 | /* Total length */ | |
93 | u_int16_t target_size; | |
94 | } u; | |
95 | ||
96 | unsigned char data[0]; | |
97 | }; | |
98 | ||
99 | struct ip6t_standard_target | |
100 | { | |
101 | struct ip6t_entry_target target; | |
102 | int verdict; | |
103 | }; | |
104 | ||
105 | struct ip6t_counters | |
106 | { | |
107 | u_int64_t pcnt, bcnt; /* Packet and byte counters */ | |
108 | }; | |
109 | ||
110 | /* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */ | |
111 | #define IP6T_F_PROTO 0x01 /* Set if rule cares about upper | |
112 | protocols */ | |
113 | #define IP6T_F_TOS 0x02 /* Match the TOS. */ | |
114 | #define IP6T_F_MASK 0x03 /* All possible flag bits mask. */ | |
115 | ||
116 | /* Values for "inv" field in struct ip6t_ip6. */ | |
117 | #define IP6T_INV_VIA_IN 0x01 /* Invert the sense of IN IFACE. */ | |
118 | #define IP6T_INV_VIA_OUT 0x02 /* Invert the sense of OUT IFACE */ | |
119 | #define IP6T_INV_TOS 0x04 /* Invert the sense of TOS. */ | |
120 | #define IP6T_INV_SRCIP 0x08 /* Invert the sense of SRC IP. */ | |
121 | #define IP6T_INV_DSTIP 0x10 /* Invert the sense of DST OP. */ | |
122 | #define IP6T_INV_FRAG 0x20 /* Invert the sense of FRAG. */ | |
123 | #define IP6T_INV_PROTO 0x40 /* Invert the sense of PROTO. */ | |
124 | #define IP6T_INV_MASK 0x7F /* All possible flag bits mask. */ | |
125 | ||
126 | /* This structure defines each of the firewall rules. Consists of 3 | |
127 | parts which are 1) general IP header stuff 2) match specific | |
128 | stuff 3) the target to perform if the rule matches */ | |
129 | struct ip6t_entry | |
130 | { | |
131 | struct ip6t_ip6 ipv6; | |
132 | ||
133 | /* Mark with fields that we care about. */ | |
134 | unsigned int nfcache; | |
135 | ||
136 | /* Size of ipt_entry + matches */ | |
137 | u_int16_t target_offset; | |
138 | /* Size of ipt_entry + matches + target */ | |
139 | u_int16_t next_offset; | |
140 | ||
141 | /* Back pointer */ | |
142 | unsigned int comefrom; | |
143 | ||
144 | /* Packet and byte counters. */ | |
145 | struct ip6t_counters counters; | |
146 | ||
147 | /* The matches (if any), then the target. */ | |
148 | unsigned char elems[0]; | |
149 | }; | |
150 | ||
151 | /* | |
152 | * New IP firewall options for [gs]etsockopt at the RAW IP level. | |
153 | * Unlike BSD Linux inherits IP options so you don't have to use | |
154 | * a raw socket for this. Instead we check rights in the calls. */ | |
155 | #define IP6T_BASE_CTL 64 /* base for firewall socket options */ | |
156 | ||
157 | #define IP6T_SO_SET_REPLACE (IP6T_BASE_CTL) | |
158 | #define IP6T_SO_SET_ADD_COUNTERS (IP6T_BASE_CTL + 1) | |
159 | #define IP6T_SO_SET_MAX IP6T_SO_SET_ADD_COUNTERS | |
160 | ||
161 | #define IP6T_SO_GET_INFO (IP6T_BASE_CTL) | |
162 | #define IP6T_SO_GET_ENTRIES (IP6T_BASE_CTL + 1) | |
163 | #define IP6T_SO_GET_MAX IP6T_SO_GET_ENTRIES | |
164 | ||
165 | /* CONTINUE verdict for targets */ | |
166 | #define IP6T_CONTINUE 0xFFFFFFFF | |
167 | ||
168 | /* For standard target */ | |
169 | #define IP6T_RETURN (-NF_REPEAT - 1) | |
170 | ||
171 | /* TCP matching stuff */ | |
172 | struct ip6t_tcp | |
173 | { | |
174 | u_int16_t spts[2]; /* Source port range. */ | |
175 | u_int16_t dpts[2]; /* Destination port range. */ | |
176 | u_int8_t option; /* TCP Option iff non-zero*/ | |
177 | u_int8_t flg_mask; /* TCP flags mask byte */ | |
178 | u_int8_t flg_cmp; /* TCP flags compare byte */ | |
179 | u_int8_t invflags; /* Inverse flags */ | |
180 | }; | |
181 | ||
182 | /* Values for "inv" field in struct ipt_tcp. */ | |
183 | #define IP6T_TCP_INV_SRCPT 0x01 /* Invert the sense of source ports. */ | |
184 | #define IP6T_TCP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */ | |
185 | #define IP6T_TCP_INV_FLAGS 0x04 /* Invert the sense of TCP flags. */ | |
186 | #define IP6T_TCP_INV_OPTION 0x08 /* Invert the sense of option test. */ | |
187 | #define IP6T_TCP_INV_MASK 0x0F /* All possible flags. */ | |
188 | ||
189 | /* UDP matching stuff */ | |
190 | struct ip6t_udp | |
191 | { | |
192 | u_int16_t spts[2]; /* Source port range. */ | |
193 | u_int16_t dpts[2]; /* Destination port range. */ | |
194 | u_int8_t invflags; /* Inverse flags */ | |
195 | }; | |
196 | ||
197 | /* Values for "invflags" field in struct ipt_udp. */ | |
198 | #define IP6T_UDP_INV_SRCPT 0x01 /* Invert the sense of source ports. */ | |
199 | #define IP6T_UDP_INV_DSTPT 0x02 /* Invert the sense of dest ports. */ | |
200 | #define IP6T_UDP_INV_MASK 0x03 /* All possible flags. */ | |
201 | ||
202 | /* ICMP matching stuff */ | |
203 | struct ip6t_icmp | |
204 | { | |
205 | u_int8_t type; /* type to match */ | |
206 | u_int8_t code[2]; /* range of code */ | |
207 | u_int8_t invflags; /* Inverse flags */ | |
208 | }; | |
209 | ||
210 | /* Values for "inv" field for struct ipt_icmp. */ | |
211 | #define IP6T_ICMP_INV 0x01 /* Invert the sense of type/code test */ | |
212 | ||
213 | /* The argument to IP6T_SO_GET_INFO */ | |
214 | struct ip6t_getinfo | |
215 | { | |
216 | /* Which table: caller fills this in. */ | |
217 | char name[IP6T_TABLE_MAXNAMELEN]; | |
218 | ||
219 | /* Kernel fills these in. */ | |
220 | /* Which hook entry points are valid: bitmask */ | |
221 | unsigned int valid_hooks; | |
222 | ||
223 | /* Hook entry points: one per netfilter hook. */ | |
224 | unsigned int hook_entry[NF_IP6_NUMHOOKS]; | |
225 | ||
226 | /* Underflow points. */ | |
227 | unsigned int underflow[NF_IP6_NUMHOOKS]; | |
228 | ||
229 | /* Number of entries */ | |
230 | unsigned int num_entries; | |
231 | ||
232 | /* Size of entries. */ | |
233 | unsigned int size; | |
234 | }; | |
235 | ||
236 | /* The argument to IP6T_SO_SET_REPLACE. */ | |
237 | struct ip6t_replace | |
238 | { | |
239 | /* Which table. */ | |
240 | char name[IP6T_TABLE_MAXNAMELEN]; | |
241 | ||
242 | /* Which hook entry points are valid: bitmask. You can't | |
243 | change this. */ | |
244 | unsigned int valid_hooks; | |
245 | ||
246 | /* Number of entries */ | |
247 | unsigned int num_entries; | |
248 | ||
249 | /* Total size of new entries */ | |
250 | unsigned int size; | |
251 | ||
252 | /* Hook entry points. */ | |
253 | unsigned int hook_entry[NF_IP6_NUMHOOKS]; | |
254 | ||
255 | /* Underflow points. */ | |
256 | unsigned int underflow[NF_IP6_NUMHOOKS]; | |
257 | ||
258 | /* Information about old entries: */ | |
259 | /* Number of counters (must be equal to current number of entries). */ | |
260 | unsigned int num_counters; | |
261 | /* The old entries' counters. */ | |
262 | struct ip6t_counters __user *counters; | |
263 | ||
264 | /* The entries (hang off end: not really an array). */ | |
265 | struct ip6t_entry entries[0]; | |
266 | }; | |
267 | ||
268 | /* The argument to IP6T_SO_ADD_COUNTERS. */ | |
269 | struct ip6t_counters_info | |
270 | { | |
271 | /* Which table. */ | |
272 | char name[IP6T_TABLE_MAXNAMELEN]; | |
273 | ||
274 | unsigned int num_counters; | |
275 | ||
276 | /* The counters (actually `number' of these). */ | |
277 | struct ip6t_counters counters[0]; | |
278 | }; | |
279 | ||
280 | /* The argument to IP6T_SO_GET_ENTRIES. */ | |
281 | struct ip6t_get_entries | |
282 | { | |
283 | /* Which table: user fills this in. */ | |
284 | char name[IP6T_TABLE_MAXNAMELEN]; | |
285 | ||
286 | /* User fills this in: total entry size. */ | |
287 | unsigned int size; | |
288 | ||
289 | /* The entries. */ | |
290 | struct ip6t_entry entrytable[0]; | |
291 | }; | |
292 | ||
293 | /* Standard return verdict, or do jump. */ | |
294 | #define IP6T_STANDARD_TARGET "" | |
295 | /* Error verdict. */ | |
296 | #define IP6T_ERROR_TARGET "ERROR" | |
297 | ||
298 | /* Helper functions */ | |
299 | static __inline__ struct ip6t_entry_target * | |
300 | ip6t_get_target(struct ip6t_entry *e) | |
301 | { | |
302 | return (void *)e + e->target_offset; | |
303 | } | |
304 | ||
305 | /* fn returns 0 to continue iteration */ | |
306 | #define IP6T_MATCH_ITERATE(e, fn, args...) \ | |
307 | ({ \ | |
308 | unsigned int __i; \ | |
309 | int __ret = 0; \ | |
310 | struct ip6t_entry_match *__m; \ | |
311 | \ | |
312 | for (__i = sizeof(struct ip6t_entry); \ | |
313 | __i < (e)->target_offset; \ | |
314 | __i += __m->u.match_size) { \ | |
315 | __m = (void *)(e) + __i; \ | |
316 | \ | |
317 | __ret = fn(__m , ## args); \ | |
318 | if (__ret != 0) \ | |
319 | break; \ | |
320 | } \ | |
321 | __ret; \ | |
322 | }) | |
323 | ||
324 | /* fn returns 0 to continue iteration */ | |
325 | #define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \ | |
326 | ({ \ | |
327 | unsigned int __i; \ | |
328 | int __ret = 0; \ | |
329 | struct ip6t_entry *__e; \ | |
330 | \ | |
331 | for (__i = 0; __i < (size); __i += __e->next_offset) { \ | |
332 | __e = (void *)(entries) + __i; \ | |
333 | \ | |
334 | __ret = fn(__e , ## args); \ | |
335 | if (__ret != 0) \ | |
336 | break; \ | |
337 | } \ | |
338 | __ret; \ | |
339 | }) | |
340 | ||
341 | /* | |
342 | * Main firewall chains definitions and global var's definitions. | |
343 | */ | |
344 | ||
345 | #ifdef __KERNEL__ | |
346 | ||
347 | #include <linux/init.h> | |
348 | extern void ip6t_init(void) __init; | |
349 | ||
350 | struct ip6t_match | |
351 | { | |
352 | struct list_head list; | |
353 | ||
354 | const char name[IP6T_FUNCTION_MAXNAMELEN]; | |
355 | ||
356 | /* Return true or false: return FALSE and set *hotdrop = 1 to | |
357 | force immediate packet drop. */ | |
358 | /* Arguments changed since 2.6.9, as this must now handle | |
359 | non-linear skb, using skb_header_pointer and | |
360 | skb_ip_make_writable. */ | |
361 | int (*match)(const struct sk_buff *skb, | |
362 | const struct net_device *in, | |
363 | const struct net_device *out, | |
364 | const void *matchinfo, | |
365 | int offset, | |
366 | unsigned int protoff, | |
367 | int *hotdrop); | |
368 | ||
369 | /* Called when user tries to insert an entry of this type. */ | |
370 | /* Should return true or false. */ | |
371 | int (*checkentry)(const char *tablename, | |
372 | const struct ip6t_ip6 *ip, | |
373 | void *matchinfo, | |
374 | unsigned int matchinfosize, | |
375 | unsigned int hook_mask); | |
376 | ||
377 | /* Called when entry of this type deleted. */ | |
378 | void (*destroy)(void *matchinfo, unsigned int matchinfosize); | |
379 | ||
380 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
381 | struct module *me; | |
382 | }; | |
383 | ||
384 | /* Registration hooks for targets. */ | |
385 | struct ip6t_target | |
386 | { | |
387 | struct list_head list; | |
388 | ||
389 | const char name[IP6T_FUNCTION_MAXNAMELEN]; | |
390 | ||
391 | /* Returns verdict. Argument order changed since 2.6.9, as this | |
392 | must now handle non-linear skbs, using skb_copy_bits and | |
393 | skb_ip_make_writable. */ | |
394 | unsigned int (*target)(struct sk_buff **pskb, | |
395 | const struct net_device *in, | |
396 | const struct net_device *out, | |
397 | unsigned int hooknum, | |
398 | const void *targinfo, | |
399 | void *userdata); | |
400 | ||
401 | /* Called when user tries to insert an entry of this type: | |
402 | hook_mask is a bitmask of hooks from which it can be | |
403 | called. */ | |
404 | /* Should return true or false. */ | |
405 | int (*checkentry)(const char *tablename, | |
406 | const struct ip6t_entry *e, | |
407 | void *targinfo, | |
408 | unsigned int targinfosize, | |
409 | unsigned int hook_mask); | |
410 | ||
411 | /* Called when entry of this type deleted. */ | |
412 | void (*destroy)(void *targinfo, unsigned int targinfosize); | |
413 | ||
414 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
415 | struct module *me; | |
416 | }; | |
417 | ||
418 | extern int ip6t_register_target(struct ip6t_target *target); | |
419 | extern void ip6t_unregister_target(struct ip6t_target *target); | |
420 | ||
421 | extern int ip6t_register_match(struct ip6t_match *match); | |
422 | extern void ip6t_unregister_match(struct ip6t_match *match); | |
423 | ||
424 | /* Furniture shopping... */ | |
425 | struct ip6t_table | |
426 | { | |
427 | struct list_head list; | |
428 | ||
429 | /* A unique name... */ | |
430 | char name[IP6T_TABLE_MAXNAMELEN]; | |
431 | ||
432 | /* What hooks you will enter on */ | |
433 | unsigned int valid_hooks; | |
434 | ||
435 | /* Lock for the curtain */ | |
436 | rwlock_t lock; | |
437 | ||
438 | /* Man behind the curtain... */ | |
439 | struct ip6t_table_info *private; | |
440 | ||
441 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
442 | struct module *me; | |
443 | }; | |
444 | ||
445 | extern int ip6t_register_table(struct ip6t_table *table, | |
446 | const struct ip6t_replace *repl); | |
447 | extern void ip6t_unregister_table(struct ip6t_table *table); | |
448 | extern unsigned int ip6t_do_table(struct sk_buff **pskb, | |
449 | unsigned int hook, | |
450 | const struct net_device *in, | |
451 | const struct net_device *out, | |
452 | struct ip6t_table *table, | |
453 | void *userdata); | |
454 | ||
455 | /* Check for an extension */ | |
456 | extern int ip6t_ext_hdr(u8 nexthdr); | |
457 | ||
458 | #define IP6T_ALIGN(s) (((s) + (__alignof__(struct ip6t_entry)-1)) & ~(__alignof__(struct ip6t_entry)-1)) | |
459 | ||
460 | #endif /*__KERNEL__*/ | |
461 | #endif /* _IP6_TABLES_H */ |