Commit | Line | Data |
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2e4e6a17 HW |
1 | #ifndef _X_TABLES_H |
2 | #define _X_TABLES_H | |
60c195c7 | 3 | |
2e4e6a17 HW |
4 | |
5 | #include <linux/netdevice.h> | |
94d0ec58 | 6 | #include <uapi/linux/netfilter/x_tables.h> |
2e4e6a17 | 7 | |
f7108a20 | 8 | /** |
de74c169 | 9 | * struct xt_action_param - parameters for matches/targets |
f7108a20 | 10 | * |
de74c169 JE |
11 | * @match: the match extension |
12 | * @target: the target extension | |
13 | * @matchinfo: per-match data | |
14 | * @targetinfo: per-target data | |
f7108a20 JE |
15 | * @in: input netdevice |
16 | * @out: output netdevice | |
f7108a20 JE |
17 | * @fragoff: packet is a fragment, this is the data offset |
18 | * @thoff: position of transport header relative to skb->data | |
a5e78820 | 19 | * @hook: hook number given packet came from |
916a917d JE |
20 | * @family: Actual NFPROTO_* through which the function is invoked |
21 | * (helpful when match->family == NFPROTO_UNSPEC) | |
b4ba2611 JE |
22 | * |
23 | * Fields written to by extensions: | |
24 | * | |
a5e78820 | 25 | * @hotdrop: drop packet if we had inspection problems |
16599786 | 26 | * Network namespace obtainable using dev_net(in/out) |
f7108a20 | 27 | */ |
de74c169 JE |
28 | struct xt_action_param { |
29 | union { | |
30 | const struct xt_match *match; | |
31 | const struct xt_target *target; | |
32 | }; | |
33 | union { | |
34 | const void *matchinfo, *targinfo; | |
35 | }; | |
f7108a20 | 36 | const struct net_device *in, *out; |
f7108a20 JE |
37 | int fragoff; |
38 | unsigned int thoff; | |
a5e78820 | 39 | unsigned int hooknum; |
916a917d | 40 | u_int8_t family; |
b4ba2611 | 41 | bool hotdrop; |
f7108a20 JE |
42 | }; |
43 | ||
9b4fce7a JE |
44 | /** |
45 | * struct xt_mtchk_param - parameters for match extensions' | |
46 | * checkentry functions | |
47 | * | |
16599786 | 48 | * @net: network namespace through which the check was invoked |
9b4fce7a JE |
49 | * @table: table the rule is tried to be inserted into |
50 | * @entryinfo: the family-specific rule data | |
16599786 | 51 | * (struct ipt_ip, ip6t_ip, arpt_arp or (note) ebt_entry) |
9b4fce7a JE |
52 | * @match: struct xt_match through which this function was invoked |
53 | * @matchinfo: per-match data | |
54 | * @hook_mask: via which hooks the new rule is reachable | |
16599786 | 55 | * Other fields as above. |
9b4fce7a JE |
56 | */ |
57 | struct xt_mtchk_param { | |
a83d8e8d | 58 | struct net *net; |
9b4fce7a JE |
59 | const char *table; |
60 | const void *entryinfo; | |
61 | const struct xt_match *match; | |
62 | void *matchinfo; | |
63 | unsigned int hook_mask; | |
916a917d | 64 | u_int8_t family; |
9b4fce7a JE |
65 | }; |
66 | ||
16599786 JE |
67 | /** |
68 | * struct xt_mdtor_param - match destructor parameters | |
69 | * Fields as above. | |
70 | */ | |
6be3d859 | 71 | struct xt_mtdtor_param { |
f54e9367 | 72 | struct net *net; |
6be3d859 JE |
73 | const struct xt_match *match; |
74 | void *matchinfo; | |
916a917d | 75 | u_int8_t family; |
6be3d859 JE |
76 | }; |
77 | ||
af5d6dc2 JE |
78 | /** |
79 | * struct xt_tgchk_param - parameters for target extensions' | |
80 | * checkentry functions | |
81 | * | |
82 | * @entryinfo: the family-specific rule data | |
83 | * (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry) | |
84 | * | |
85 | * Other fields see above. | |
86 | */ | |
87 | struct xt_tgchk_param { | |
add67461 | 88 | struct net *net; |
af5d6dc2 | 89 | const char *table; |
f79fca55 | 90 | const void *entryinfo; |
af5d6dc2 JE |
91 | const struct xt_target *target; |
92 | void *targinfo; | |
93 | unsigned int hook_mask; | |
916a917d | 94 | u_int8_t family; |
af5d6dc2 JE |
95 | }; |
96 | ||
a2df1648 JE |
97 | /* Target destructor parameters */ |
98 | struct xt_tgdtor_param { | |
add67461 | 99 | struct net *net; |
a2df1648 JE |
100 | const struct xt_target *target; |
101 | void *targinfo; | |
916a917d | 102 | u_int8_t family; |
a2df1648 JE |
103 | }; |
104 | ||
d94d9fee | 105 | struct xt_match { |
2e4e6a17 HW |
106 | struct list_head list; |
107 | ||
4b2cbd42 | 108 | const char name[XT_EXTENSION_MAXNAMELEN]; |
daaf83d2 | 109 | u_int8_t revision; |
2e4e6a17 | 110 | |
2e4e6a17 HW |
111 | /* Return true or false: return FALSE and set *hotdrop = 1 to |
112 | force immediate packet drop. */ | |
113 | /* Arguments changed since 2.6.9, as this must now handle | |
114 | non-linear skb, using skb_header_pointer and | |
115 | skb_ip_make_writable. */ | |
1d93a9cb | 116 | bool (*match)(const struct sk_buff *skb, |
62fc8051 | 117 | struct xt_action_param *); |
2e4e6a17 HW |
118 | |
119 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 120 | int (*checkentry)(const struct xt_mtchk_param *); |
2e4e6a17 HW |
121 | |
122 | /* Called when entry of this type deleted. */ | |
6be3d859 | 123 | void (*destroy)(const struct xt_mtdtor_param *); |
c30f540b | 124 | #ifdef CONFIG_COMPAT |
2722971c | 125 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
126 | void (*compat_from_user)(void *dst, const void *src); |
127 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 128 | #endif |
2e4e6a17 HW |
129 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
130 | struct module *me; | |
37f9f733 | 131 | |
ecb6f85e | 132 | const char *table; |
37f9f733 | 133 | unsigned int matchsize; |
c30f540b | 134 | #ifdef CONFIG_COMPAT |
9fa492cd | 135 | unsigned int compatsize; |
c30f540b | 136 | #endif |
37f9f733 PM |
137 | unsigned int hooks; |
138 | unsigned short proto; | |
c4b88513 PM |
139 | |
140 | unsigned short family; | |
2e4e6a17 HW |
141 | }; |
142 | ||
143 | /* Registration hooks for targets. */ | |
d94d9fee | 144 | struct xt_target { |
2e4e6a17 HW |
145 | struct list_head list; |
146 | ||
4b2cbd42 | 147 | const char name[XT_EXTENSION_MAXNAMELEN]; |
f5c511c6 | 148 | u_int8_t revision; |
2e4e6a17 | 149 | |
2e4e6a17 HW |
150 | /* Returns verdict. Argument order changed since 2.6.9, as this |
151 | must now handle non-linear skbs, using skb_copy_bits and | |
152 | skb_ip_make_writable. */ | |
3db05fea | 153 | unsigned int (*target)(struct sk_buff *skb, |
de74c169 | 154 | const struct xt_action_param *); |
2e4e6a17 HW |
155 | |
156 | /* Called when user tries to insert an entry of this type: | |
157 | hook_mask is a bitmask of hooks from which it can be | |
158 | called. */ | |
7ea7b858 | 159 | /* Should return 0 on success or an error code otherwise (-Exxxx). */ |
135367b8 | 160 | int (*checkentry)(const struct xt_tgchk_param *); |
2e4e6a17 HW |
161 | |
162 | /* Called when entry of this type deleted. */ | |
a2df1648 | 163 | void (*destroy)(const struct xt_tgdtor_param *); |
c30f540b | 164 | #ifdef CONFIG_COMPAT |
2722971c | 165 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
166 | void (*compat_from_user)(void *dst, const void *src); |
167 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 168 | #endif |
2e4e6a17 HW |
169 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
170 | struct module *me; | |
37f9f733 | 171 | |
ecb6f85e | 172 | const char *table; |
37f9f733 | 173 | unsigned int targetsize; |
c30f540b | 174 | #ifdef CONFIG_COMPAT |
9fa492cd | 175 | unsigned int compatsize; |
c30f540b | 176 | #endif |
37f9f733 PM |
177 | unsigned int hooks; |
178 | unsigned short proto; | |
c4b88513 PM |
179 | |
180 | unsigned short family; | |
2e4e6a17 HW |
181 | }; |
182 | ||
183 | /* Furniture shopping... */ | |
d94d9fee | 184 | struct xt_table { |
2e4e6a17 HW |
185 | struct list_head list; |
186 | ||
2e4e6a17 HW |
187 | /* What hooks you will enter on */ |
188 | unsigned int valid_hooks; | |
189 | ||
2e4e6a17 | 190 | /* Man behind the curtain... */ |
4a2f965c | 191 | struct xt_table_info *private; |
2e4e6a17 HW |
192 | |
193 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
194 | struct module *me; | |
195 | ||
76108cea | 196 | u_int8_t af; /* address/protocol family */ |
2b95efe7 | 197 | int priority; /* hook order */ |
4a2f965c SH |
198 | |
199 | /* A unique name... */ | |
200 | const char name[XT_TABLE_MAXNAMELEN]; | |
2e4e6a17 HW |
201 | }; |
202 | ||
203 | #include <linux/netfilter_ipv4.h> | |
204 | ||
205 | /* The table itself */ | |
d94d9fee | 206 | struct xt_table_info { |
2e4e6a17 HW |
207 | /* Size per table */ |
208 | unsigned int size; | |
209 | /* Number of entries: FIXME. --RR */ | |
210 | unsigned int number; | |
211 | /* Initial number of entries. Needed for module usage count */ | |
212 | unsigned int initial_entries; | |
213 | ||
214 | /* Entry points and underflows */ | |
6e23ae2a PM |
215 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
216 | unsigned int underflow[NF_INET_NUMHOOKS]; | |
2e4e6a17 | 217 | |
f3c5c1bf JE |
218 | /* |
219 | * Number of user chains. Since tables cannot have loops, at most | |
220 | * @stacksize jumps (number of user chains) can possibly be made. | |
221 | */ | |
222 | unsigned int stacksize; | |
7489aec8 | 223 | unsigned int __percpu *stackptr; |
f3c5c1bf | 224 | void ***jumpstack; |
2e4e6a17 | 225 | /* ipt_entry tables: one per CPU */ |
259d4e41 | 226 | /* Note : this field MUST be the last one, see XT_TABLE_INFO_SZ */ |
78454473 | 227 | void *entries[1]; |
2e4e6a17 HW |
228 | }; |
229 | ||
259d4e41 ED |
230 | #define XT_TABLE_INFO_SZ (offsetof(struct xt_table_info, entries) \ |
231 | + nr_cpu_ids * sizeof(char *)) | |
a45049c5 PNA |
232 | extern int xt_register_target(struct xt_target *target); |
233 | extern void xt_unregister_target(struct xt_target *target); | |
52d9c42e PM |
234 | extern int xt_register_targets(struct xt_target *target, unsigned int n); |
235 | extern void xt_unregister_targets(struct xt_target *target, unsigned int n); | |
236 | ||
a45049c5 PNA |
237 | extern int xt_register_match(struct xt_match *target); |
238 | extern void xt_unregister_match(struct xt_match *target); | |
52d9c42e PM |
239 | extern int xt_register_matches(struct xt_match *match, unsigned int n); |
240 | extern void xt_unregister_matches(struct xt_match *match, unsigned int n); | |
2e4e6a17 | 241 | |
71f72bbf | 242 | int xt_check_entry_offsets(const void *base, const char *elems, |
ff9be206 FW |
243 | unsigned int target_offset, |
244 | unsigned int next_offset); | |
245 | ||
916a917d | 246 | extern int xt_check_match(struct xt_mtchk_param *, |
9b4fce7a | 247 | unsigned int size, u_int8_t proto, bool inv_proto); |
916a917d | 248 | extern int xt_check_target(struct xt_tgchk_param *, |
af5d6dc2 | 249 | unsigned int size, u_int8_t proto, bool inv_proto); |
37f9f733 | 250 | |
0a052338 FW |
251 | void *xt_copy_counters_from_user(const void __user *user, unsigned int len, |
252 | struct xt_counters_info *info, bool compat); | |
253 | ||
8d870052 | 254 | extern struct xt_table *xt_register_table(struct net *net, |
35aad0ff | 255 | const struct xt_table *table, |
a98da11d AD |
256 | struct xt_table_info *bootstrap, |
257 | struct xt_table_info *newinfo); | |
2e4e6a17 HW |
258 | extern void *xt_unregister_table(struct xt_table *table); |
259 | ||
260 | extern struct xt_table_info *xt_replace_table(struct xt_table *table, | |
261 | unsigned int num_counters, | |
262 | struct xt_table_info *newinfo, | |
263 | int *error); | |
264 | ||
76108cea JE |
265 | extern struct xt_match *xt_find_match(u8 af, const char *name, u8 revision); |
266 | extern struct xt_target *xt_find_target(u8 af, const char *name, u8 revision); | |
fd0ec0e6 JE |
267 | extern struct xt_match *xt_request_find_match(u8 af, const char *name, |
268 | u8 revision); | |
76108cea | 269 | extern struct xt_target *xt_request_find_target(u8 af, const char *name, |
2e4e6a17 | 270 | u8 revision); |
76108cea JE |
271 | extern int xt_find_revision(u8 af, const char *name, u8 revision, |
272 | int target, int *err); | |
2e4e6a17 | 273 | |
76108cea | 274 | extern struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, |
8d870052 | 275 | const char *name); |
2e4e6a17 HW |
276 | extern void xt_table_unlock(struct xt_table *t); |
277 | ||
76108cea JE |
278 | extern int xt_proto_init(struct net *net, u_int8_t af); |
279 | extern void xt_proto_fini(struct net *net, u_int8_t af); | |
2e4e6a17 HW |
280 | |
281 | extern struct xt_table_info *xt_alloc_table_info(unsigned int size); | |
282 | extern void xt_free_table_info(struct xt_table_info *info); | |
942e4a2b | 283 | |
7f5c6d4f ED |
284 | /** |
285 | * xt_recseq - recursive seqcount for netfilter use | |
286 | * | |
287 | * Packet processing changes the seqcount only if no recursion happened | |
288 | * get_counters() can use read_seqcount_begin()/read_seqcount_retry(), | |
289 | * because we use the normal seqcount convention : | |
290 | * Low order bit set to 1 if a writer is active. | |
942e4a2b | 291 | */ |
7f5c6d4f | 292 | DECLARE_PER_CPU(seqcount_t, xt_recseq); |
942e4a2b | 293 | |
7f5c6d4f ED |
294 | /** |
295 | * xt_write_recseq_begin - start of a write section | |
942e4a2b | 296 | * |
7f5c6d4f ED |
297 | * Begin packet processing : all readers must wait the end |
298 | * 1) Must be called with preemption disabled | |
933393f5 | 299 | * 2) softirqs must be disabled too (or we should use this_cpu_add()) |
7f5c6d4f ED |
300 | * Returns : |
301 | * 1 if no recursion on this cpu | |
302 | * 0 if recursion detected | |
942e4a2b | 303 | */ |
7f5c6d4f | 304 | static inline unsigned int xt_write_recseq_begin(void) |
942e4a2b | 305 | { |
7f5c6d4f | 306 | unsigned int addend; |
942e4a2b | 307 | |
7f5c6d4f ED |
308 | /* |
309 | * Low order bit of sequence is set if we already | |
310 | * called xt_write_recseq_begin(). | |
311 | */ | |
312 | addend = (__this_cpu_read(xt_recseq.sequence) + 1) & 1; | |
942e4a2b | 313 | |
7f5c6d4f ED |
314 | /* |
315 | * This is kind of a write_seqcount_begin(), but addend is 0 or 1 | |
316 | * We dont check addend value to avoid a test and conditional jump, | |
317 | * since addend is most likely 1 | |
318 | */ | |
319 | __this_cpu_add(xt_recseq.sequence, addend); | |
320 | smp_wmb(); | |
942e4a2b | 321 | |
7f5c6d4f | 322 | return addend; |
942e4a2b SH |
323 | } |
324 | ||
7f5c6d4f ED |
325 | /** |
326 | * xt_write_recseq_end - end of a write section | |
327 | * @addend: return value from previous xt_write_recseq_begin() | |
328 | * | |
329 | * End packet processing : all readers can proceed | |
330 | * 1) Must be called with preemption disabled | |
933393f5 | 331 | * 2) softirqs must be disabled too (or we should use this_cpu_add()) |
942e4a2b | 332 | */ |
7f5c6d4f | 333 | static inline void xt_write_recseq_end(unsigned int addend) |
942e4a2b | 334 | { |
7f5c6d4f ED |
335 | /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */ |
336 | smp_wmb(); | |
337 | __this_cpu_add(xt_recseq.sequence, addend); | |
942e4a2b | 338 | } |
2e4e6a17 | 339 | |
b8dfe498 ED |
340 | /* |
341 | * This helper is performance critical and must be inlined | |
342 | */ | |
343 | static inline unsigned long ifname_compare_aligned(const char *_a, | |
344 | const char *_b, | |
345 | const char *_mask) | |
346 | { | |
347 | const unsigned long *a = (const unsigned long *)_a; | |
348 | const unsigned long *b = (const unsigned long *)_b; | |
349 | const unsigned long *mask = (const unsigned long *)_mask; | |
350 | unsigned long ret; | |
351 | ||
352 | ret = (a[0] ^ b[0]) & mask[0]; | |
353 | if (IFNAMSIZ > sizeof(unsigned long)) | |
354 | ret |= (a[1] ^ b[1]) & mask[1]; | |
355 | if (IFNAMSIZ > 2 * sizeof(unsigned long)) | |
356 | ret |= (a[2] ^ b[2]) & mask[2]; | |
357 | if (IFNAMSIZ > 3 * sizeof(unsigned long)) | |
358 | ret |= (a[3] ^ b[3]) & mask[3]; | |
359 | BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long)); | |
360 | return ret; | |
361 | } | |
362 | ||
2b95efe7 JE |
363 | extern struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *); |
364 | extern void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *); | |
365 | ||
2722971c DM |
366 | #ifdef CONFIG_COMPAT |
367 | #include <net/compat.h> | |
368 | ||
d94d9fee | 369 | struct compat_xt_entry_match { |
2722971c DM |
370 | union { |
371 | struct { | |
372 | u_int16_t match_size; | |
373 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
374 | u_int8_t revision; | |
375 | } user; | |
46c5ea3c PM |
376 | struct { |
377 | u_int16_t match_size; | |
378 | compat_uptr_t match; | |
379 | } kernel; | |
2722971c DM |
380 | u_int16_t match_size; |
381 | } u; | |
382 | unsigned char data[0]; | |
383 | }; | |
384 | ||
d94d9fee | 385 | struct compat_xt_entry_target { |
2722971c DM |
386 | union { |
387 | struct { | |
388 | u_int16_t target_size; | |
389 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
390 | u_int8_t revision; | |
391 | } user; | |
46c5ea3c PM |
392 | struct { |
393 | u_int16_t target_size; | |
394 | compat_uptr_t target; | |
395 | } kernel; | |
2722971c DM |
396 | u_int16_t target_size; |
397 | } u; | |
398 | unsigned char data[0]; | |
399 | }; | |
400 | ||
401 | /* FIXME: this works only on 32 bit tasks | |
402 | * need to change whole approach in order to calculate align as function of | |
403 | * current task alignment */ | |
404 | ||
d94d9fee | 405 | struct compat_xt_counters { |
0a026046 | 406 | compat_u64 pcnt, bcnt; /* Packet and byte counters */ |
2722971c DM |
407 | }; |
408 | ||
d94d9fee | 409 | struct compat_xt_counters_info { |
2722971c DM |
410 | char name[XT_TABLE_MAXNAMELEN]; |
411 | compat_uint_t num_counters; | |
412 | struct compat_xt_counters counters[0]; | |
413 | }; | |
414 | ||
42107f50 AD |
415 | struct _compat_xt_align { |
416 | __u8 u8; | |
417 | __u16 u16; | |
418 | __u32 u32; | |
419 | compat_u64 u64; | |
420 | }; | |
421 | ||
a79ff731 | 422 | #define COMPAT_XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _compat_xt_align)) |
2722971c | 423 | |
76108cea JE |
424 | extern void xt_compat_lock(u_int8_t af); |
425 | extern void xt_compat_unlock(u_int8_t af); | |
9fa492cd | 426 | |
255d0dc3 | 427 | extern int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta); |
76108cea | 428 | extern void xt_compat_flush_offsets(u_int8_t af); |
255d0dc3 | 429 | extern void xt_compat_init_offsets(u_int8_t af, unsigned int number); |
3e5e524f | 430 | extern int xt_compat_calc_jump(u_int8_t af, unsigned int offset); |
b386d9f5 | 431 | |
5452e425 | 432 | extern int xt_compat_match_offset(const struct xt_match *match); |
fbe426f8 | 433 | extern void xt_compat_match_from_user(struct xt_entry_match *m, |
b0a6363c | 434 | void **dstptr, unsigned int *size); |
739674fb | 435 | extern int xt_compat_match_to_user(const struct xt_entry_match *m, |
b0a6363c | 436 | void __user **dstptr, unsigned int *size); |
9fa492cd | 437 | |
5452e425 | 438 | extern int xt_compat_target_offset(const struct xt_target *target); |
9fa492cd | 439 | extern void xt_compat_target_from_user(struct xt_entry_target *t, |
b0a6363c | 440 | void **dstptr, unsigned int *size); |
739674fb | 441 | extern int xt_compat_target_to_user(const struct xt_entry_target *t, |
b0a6363c | 442 | void __user **dstptr, unsigned int *size); |
71f72bbf | 443 | int xt_compat_check_entry_offsets(const void *base, const char *elems, |
30532332 FW |
444 | unsigned int target_offset, |
445 | unsigned int next_offset); | |
2722971c DM |
446 | |
447 | #endif /* CONFIG_COMPAT */ | |
2e4e6a17 | 448 | #endif /* _X_TABLES_H */ |