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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> | |
dcebd315 | 6 | #include <linux/static_key.h> |
94d0ec58 | 7 | #include <uapi/linux/netfilter/x_tables.h> |
2e4e6a17 | 8 | |
f7108a20 | 9 | /** |
de74c169 | 10 | * struct xt_action_param - parameters for matches/targets |
f7108a20 | 11 | * |
de74c169 JE |
12 | * @match: the match extension |
13 | * @target: the target extension | |
14 | * @matchinfo: per-match data | |
15 | * @targetinfo: per-target data | |
156c196f | 16 | * @net network namespace through which the action was invoked |
f7108a20 JE |
17 | * @in: input netdevice |
18 | * @out: output netdevice | |
f7108a20 JE |
19 | * @fragoff: packet is a fragment, this is the data offset |
20 | * @thoff: position of transport header relative to skb->data | |
a5e78820 | 21 | * @hook: hook number given packet came from |
916a917d JE |
22 | * @family: Actual NFPROTO_* through which the function is invoked |
23 | * (helpful when match->family == NFPROTO_UNSPEC) | |
b4ba2611 JE |
24 | * |
25 | * Fields written to by extensions: | |
26 | * | |
a5e78820 | 27 | * @hotdrop: drop packet if we had inspection problems |
f7108a20 | 28 | */ |
de74c169 JE |
29 | struct xt_action_param { |
30 | union { | |
31 | const struct xt_match *match; | |
32 | const struct xt_target *target; | |
33 | }; | |
34 | union { | |
35 | const void *matchinfo, *targinfo; | |
36 | }; | |
156c196f | 37 | struct net *net; |
f7108a20 | 38 | const struct net_device *in, *out; |
f7108a20 JE |
39 | int fragoff; |
40 | unsigned int thoff; | |
a5e78820 | 41 | unsigned int hooknum; |
916a917d | 42 | u_int8_t family; |
b4ba2611 | 43 | bool hotdrop; |
f7108a20 JE |
44 | }; |
45 | ||
9b4fce7a JE |
46 | /** |
47 | * struct xt_mtchk_param - parameters for match extensions' | |
48 | * checkentry functions | |
49 | * | |
16599786 | 50 | * @net: network namespace through which the check was invoked |
9b4fce7a JE |
51 | * @table: table the rule is tried to be inserted into |
52 | * @entryinfo: the family-specific rule data | |
16599786 | 53 | * (struct ipt_ip, ip6t_ip, arpt_arp or (note) ebt_entry) |
9b4fce7a JE |
54 | * @match: struct xt_match through which this function was invoked |
55 | * @matchinfo: per-match data | |
56 | * @hook_mask: via which hooks the new rule is reachable | |
16599786 | 57 | * Other fields as above. |
9b4fce7a JE |
58 | */ |
59 | struct xt_mtchk_param { | |
a83d8e8d | 60 | struct net *net; |
9b4fce7a JE |
61 | const char *table; |
62 | const void *entryinfo; | |
63 | const struct xt_match *match; | |
64 | void *matchinfo; | |
65 | unsigned int hook_mask; | |
916a917d | 66 | u_int8_t family; |
55917a21 | 67 | bool nft_compat; |
9b4fce7a JE |
68 | }; |
69 | ||
16599786 JE |
70 | /** |
71 | * struct xt_mdtor_param - match destructor parameters | |
72 | * Fields as above. | |
73 | */ | |
6be3d859 | 74 | struct xt_mtdtor_param { |
f54e9367 | 75 | struct net *net; |
6be3d859 JE |
76 | const struct xt_match *match; |
77 | void *matchinfo; | |
916a917d | 78 | u_int8_t family; |
6be3d859 JE |
79 | }; |
80 | ||
af5d6dc2 JE |
81 | /** |
82 | * struct xt_tgchk_param - parameters for target extensions' | |
83 | * checkentry functions | |
84 | * | |
85 | * @entryinfo: the family-specific rule data | |
86 | * (struct ipt_entry, ip6t_entry, arpt_entry, ebt_entry) | |
87 | * | |
88 | * Other fields see above. | |
89 | */ | |
90 | struct xt_tgchk_param { | |
add67461 | 91 | struct net *net; |
af5d6dc2 | 92 | const char *table; |
f79fca55 | 93 | const void *entryinfo; |
af5d6dc2 JE |
94 | const struct xt_target *target; |
95 | void *targinfo; | |
96 | unsigned int hook_mask; | |
916a917d | 97 | u_int8_t family; |
55917a21 | 98 | bool nft_compat; |
af5d6dc2 JE |
99 | }; |
100 | ||
a2df1648 JE |
101 | /* Target destructor parameters */ |
102 | struct xt_tgdtor_param { | |
add67461 | 103 | struct net *net; |
a2df1648 JE |
104 | const struct xt_target *target; |
105 | void *targinfo; | |
916a917d | 106 | u_int8_t family; |
a2df1648 JE |
107 | }; |
108 | ||
d94d9fee | 109 | struct xt_match { |
2e4e6a17 HW |
110 | struct list_head list; |
111 | ||
4b2cbd42 | 112 | const char name[XT_EXTENSION_MAXNAMELEN]; |
daaf83d2 | 113 | u_int8_t revision; |
2e4e6a17 | 114 | |
2e4e6a17 HW |
115 | /* Return true or false: return FALSE and set *hotdrop = 1 to |
116 | force immediate packet drop. */ | |
117 | /* Arguments changed since 2.6.9, as this must now handle | |
118 | non-linear skb, using skb_header_pointer and | |
119 | skb_ip_make_writable. */ | |
1d93a9cb | 120 | bool (*match)(const struct sk_buff *skb, |
62fc8051 | 121 | struct xt_action_param *); |
2e4e6a17 HW |
122 | |
123 | /* Called when user tries to insert an entry of this type. */ | |
b0f38452 | 124 | int (*checkentry)(const struct xt_mtchk_param *); |
2e4e6a17 HW |
125 | |
126 | /* Called when entry of this type deleted. */ | |
6be3d859 | 127 | void (*destroy)(const struct xt_mtdtor_param *); |
c30f540b | 128 | #ifdef CONFIG_COMPAT |
2722971c | 129 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
130 | void (*compat_from_user)(void *dst, const void *src); |
131 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 132 | #endif |
2e4e6a17 HW |
133 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
134 | struct module *me; | |
37f9f733 | 135 | |
ecb6f85e | 136 | const char *table; |
37f9f733 | 137 | unsigned int matchsize; |
c30f540b | 138 | #ifdef CONFIG_COMPAT |
9fa492cd | 139 | unsigned int compatsize; |
c30f540b | 140 | #endif |
37f9f733 PM |
141 | unsigned int hooks; |
142 | unsigned short proto; | |
c4b88513 PM |
143 | |
144 | unsigned short family; | |
2e4e6a17 HW |
145 | }; |
146 | ||
147 | /* Registration hooks for targets. */ | |
d94d9fee | 148 | struct xt_target { |
2e4e6a17 HW |
149 | struct list_head list; |
150 | ||
4b2cbd42 | 151 | const char name[XT_EXTENSION_MAXNAMELEN]; |
f5c511c6 | 152 | u_int8_t revision; |
2e4e6a17 | 153 | |
2e4e6a17 HW |
154 | /* Returns verdict. Argument order changed since 2.6.9, as this |
155 | must now handle non-linear skbs, using skb_copy_bits and | |
156 | skb_ip_make_writable. */ | |
3db05fea | 157 | unsigned int (*target)(struct sk_buff *skb, |
de74c169 | 158 | const struct xt_action_param *); |
2e4e6a17 HW |
159 | |
160 | /* Called when user tries to insert an entry of this type: | |
161 | hook_mask is a bitmask of hooks from which it can be | |
162 | called. */ | |
7ea7b858 | 163 | /* Should return 0 on success or an error code otherwise (-Exxxx). */ |
135367b8 | 164 | int (*checkentry)(const struct xt_tgchk_param *); |
2e4e6a17 HW |
165 | |
166 | /* Called when entry of this type deleted. */ | |
a2df1648 | 167 | void (*destroy)(const struct xt_tgdtor_param *); |
c30f540b | 168 | #ifdef CONFIG_COMPAT |
2722971c | 169 | /* Called when userspace align differs from kernel space one */ |
739674fb JE |
170 | void (*compat_from_user)(void *dst, const void *src); |
171 | int (*compat_to_user)(void __user *dst, const void *src); | |
c30f540b | 172 | #endif |
2e4e6a17 HW |
173 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ |
174 | struct module *me; | |
37f9f733 | 175 | |
ecb6f85e | 176 | const char *table; |
37f9f733 | 177 | unsigned int targetsize; |
c30f540b | 178 | #ifdef CONFIG_COMPAT |
9fa492cd | 179 | unsigned int compatsize; |
c30f540b | 180 | #endif |
37f9f733 PM |
181 | unsigned int hooks; |
182 | unsigned short proto; | |
c4b88513 PM |
183 | |
184 | unsigned short family; | |
2e4e6a17 HW |
185 | }; |
186 | ||
187 | /* Furniture shopping... */ | |
d94d9fee | 188 | struct xt_table { |
2e4e6a17 HW |
189 | struct list_head list; |
190 | ||
2e4e6a17 HW |
191 | /* What hooks you will enter on */ |
192 | unsigned int valid_hooks; | |
193 | ||
2e4e6a17 | 194 | /* Man behind the curtain... */ |
4a2f965c | 195 | struct xt_table_info *private; |
2e4e6a17 HW |
196 | |
197 | /* Set this to THIS_MODULE if you are a module, otherwise NULL */ | |
198 | struct module *me; | |
199 | ||
76108cea | 200 | u_int8_t af; /* address/protocol family */ |
2b95efe7 | 201 | int priority; /* hook order */ |
4a2f965c SH |
202 | |
203 | /* A unique name... */ | |
204 | const char name[XT_TABLE_MAXNAMELEN]; | |
2e4e6a17 HW |
205 | }; |
206 | ||
207 | #include <linux/netfilter_ipv4.h> | |
208 | ||
209 | /* The table itself */ | |
d94d9fee | 210 | struct xt_table_info { |
2e4e6a17 HW |
211 | /* Size per table */ |
212 | unsigned int size; | |
213 | /* Number of entries: FIXME. --RR */ | |
214 | unsigned int number; | |
215 | /* Initial number of entries. Needed for module usage count */ | |
216 | unsigned int initial_entries; | |
217 | ||
218 | /* Entry points and underflows */ | |
6e23ae2a PM |
219 | unsigned int hook_entry[NF_INET_NUMHOOKS]; |
220 | unsigned int underflow[NF_INET_NUMHOOKS]; | |
2e4e6a17 | 221 | |
f3c5c1bf JE |
222 | /* |
223 | * Number of user chains. Since tables cannot have loops, at most | |
224 | * @stacksize jumps (number of user chains) can possibly be made. | |
225 | */ | |
226 | unsigned int stacksize; | |
f3c5c1bf | 227 | void ***jumpstack; |
482cfc31 | 228 | |
711bdde6 | 229 | unsigned char entries[0] __aligned(8); |
2e4e6a17 HW |
230 | }; |
231 | ||
a0f4ecf3 JP |
232 | int xt_register_target(struct xt_target *target); |
233 | void xt_unregister_target(struct xt_target *target); | |
234 | int xt_register_targets(struct xt_target *target, unsigned int n); | |
235 | void xt_unregister_targets(struct xt_target *target, unsigned int n); | |
236 | ||
237 | int xt_register_match(struct xt_match *target); | |
238 | void xt_unregister_match(struct xt_match *target); | |
239 | int xt_register_matches(struct xt_match *match, unsigned int n); | |
240 | void xt_unregister_matches(struct xt_match *match, unsigned int n); | |
241 | ||
242 | int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto, | |
243 | bool inv_proto); | |
244 | int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto, | |
245 | bool inv_proto); | |
246 | ||
247 | struct xt_table *xt_register_table(struct net *net, | |
248 | const struct xt_table *table, | |
249 | struct xt_table_info *bootstrap, | |
250 | struct xt_table_info *newinfo); | |
251 | void *xt_unregister_table(struct xt_table *table); | |
252 | ||
253 | struct xt_table_info *xt_replace_table(struct xt_table *table, | |
254 | unsigned int num_counters, | |
255 | struct xt_table_info *newinfo, | |
256 | int *error); | |
257 | ||
258 | struct xt_match *xt_find_match(u8 af, const char *name, u8 revision); | |
259 | struct xt_target *xt_find_target(u8 af, const char *name, u8 revision); | |
260 | struct xt_match *xt_request_find_match(u8 af, const char *name, u8 revision); | |
261 | struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision); | |
262 | int xt_find_revision(u8 af, const char *name, u8 revision, int target, | |
263 | int *err); | |
264 | ||
265 | struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af, | |
266 | const char *name); | |
267 | void xt_table_unlock(struct xt_table *t); | |
268 | ||
269 | int xt_proto_init(struct net *net, u_int8_t af); | |
270 | void xt_proto_fini(struct net *net, u_int8_t af); | |
271 | ||
272 | struct xt_table_info *xt_alloc_table_info(unsigned int size); | |
273 | void xt_free_table_info(struct xt_table_info *info); | |
942e4a2b | 274 | |
7f5c6d4f ED |
275 | /** |
276 | * xt_recseq - recursive seqcount for netfilter use | |
277 | * | |
278 | * Packet processing changes the seqcount only if no recursion happened | |
279 | * get_counters() can use read_seqcount_begin()/read_seqcount_retry(), | |
280 | * because we use the normal seqcount convention : | |
281 | * Low order bit set to 1 if a writer is active. | |
942e4a2b | 282 | */ |
7f5c6d4f | 283 | DECLARE_PER_CPU(seqcount_t, xt_recseq); |
942e4a2b | 284 | |
dcebd315 FW |
285 | /* xt_tee_enabled - true if x_tables needs to handle reentrancy |
286 | * | |
287 | * Enabled if current ip(6)tables ruleset has at least one -j TEE rule. | |
288 | */ | |
289 | extern struct static_key xt_tee_enabled; | |
290 | ||
7f5c6d4f ED |
291 | /** |
292 | * xt_write_recseq_begin - start of a write section | |
942e4a2b | 293 | * |
7f5c6d4f ED |
294 | * Begin packet processing : all readers must wait the end |
295 | * 1) Must be called with preemption disabled | |
933393f5 | 296 | * 2) softirqs must be disabled too (or we should use this_cpu_add()) |
7f5c6d4f ED |
297 | * Returns : |
298 | * 1 if no recursion on this cpu | |
299 | * 0 if recursion detected | |
942e4a2b | 300 | */ |
7f5c6d4f | 301 | static inline unsigned int xt_write_recseq_begin(void) |
942e4a2b | 302 | { |
7f5c6d4f | 303 | unsigned int addend; |
942e4a2b | 304 | |
7f5c6d4f ED |
305 | /* |
306 | * Low order bit of sequence is set if we already | |
307 | * called xt_write_recseq_begin(). | |
308 | */ | |
309 | addend = (__this_cpu_read(xt_recseq.sequence) + 1) & 1; | |
942e4a2b | 310 | |
7f5c6d4f ED |
311 | /* |
312 | * This is kind of a write_seqcount_begin(), but addend is 0 or 1 | |
313 | * We dont check addend value to avoid a test and conditional jump, | |
314 | * since addend is most likely 1 | |
315 | */ | |
316 | __this_cpu_add(xt_recseq.sequence, addend); | |
317 | smp_wmb(); | |
942e4a2b | 318 | |
7f5c6d4f | 319 | return addend; |
942e4a2b SH |
320 | } |
321 | ||
7f5c6d4f ED |
322 | /** |
323 | * xt_write_recseq_end - end of a write section | |
324 | * @addend: return value from previous xt_write_recseq_begin() | |
325 | * | |
326 | * End packet processing : all readers can proceed | |
327 | * 1) Must be called with preemption disabled | |
933393f5 | 328 | * 2) softirqs must be disabled too (or we should use this_cpu_add()) |
942e4a2b | 329 | */ |
7f5c6d4f | 330 | static inline void xt_write_recseq_end(unsigned int addend) |
942e4a2b | 331 | { |
7f5c6d4f ED |
332 | /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */ |
333 | smp_wmb(); | |
334 | __this_cpu_add(xt_recseq.sequence, addend); | |
942e4a2b | 335 | } |
2e4e6a17 | 336 | |
b8dfe498 ED |
337 | /* |
338 | * This helper is performance critical and must be inlined | |
339 | */ | |
340 | static inline unsigned long ifname_compare_aligned(const char *_a, | |
341 | const char *_b, | |
342 | const char *_mask) | |
343 | { | |
344 | const unsigned long *a = (const unsigned long *)_a; | |
345 | const unsigned long *b = (const unsigned long *)_b; | |
346 | const unsigned long *mask = (const unsigned long *)_mask; | |
347 | unsigned long ret; | |
348 | ||
349 | ret = (a[0] ^ b[0]) & mask[0]; | |
350 | if (IFNAMSIZ > sizeof(unsigned long)) | |
351 | ret |= (a[1] ^ b[1]) & mask[1]; | |
352 | if (IFNAMSIZ > 2 * sizeof(unsigned long)) | |
353 | ret |= (a[2] ^ b[2]) & mask[2]; | |
354 | if (IFNAMSIZ > 3 * sizeof(unsigned long)) | |
355 | ret |= (a[3] ^ b[3]) & mask[3]; | |
356 | BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long)); | |
357 | return ret; | |
358 | } | |
359 | ||
71ae0dff FW |
360 | |
361 | /* On SMP, ip(6)t_entry->counters.pcnt holds address of the | |
362 | * real (percpu) counter. On !SMP, its just the packet count, | |
363 | * so nothing needs to be done there. | |
364 | * | |
365 | * xt_percpu_counter_alloc returns the address of the percpu | |
a1a56aaa ED |
366 | * counter, or 0 on !SMP. We force an alignment of 16 bytes |
367 | * so that bytes/packets share a common cache line. | |
71ae0dff FW |
368 | * |
369 | * Hence caller must use IS_ERR_VALUE to check for error, this | |
370 | * allows us to return 0 for single core systems without forcing | |
371 | * callers to deal with SMP vs. NONSMP issues. | |
372 | */ | |
373 | static inline u64 xt_percpu_counter_alloc(void) | |
374 | { | |
375 | if (nr_cpu_ids > 1) { | |
a1a56aaa ED |
376 | void __percpu *res = __alloc_percpu(sizeof(struct xt_counters), |
377 | sizeof(struct xt_counters)); | |
71ae0dff FW |
378 | |
379 | if (res == NULL) | |
380 | return (u64) -ENOMEM; | |
381 | ||
dcb8f5c8 | 382 | return (u64) (__force unsigned long) res; |
71ae0dff FW |
383 | } |
384 | ||
385 | return 0; | |
386 | } | |
387 | static inline void xt_percpu_counter_free(u64 pcnt) | |
388 | { | |
389 | if (nr_cpu_ids > 1) | |
dcb8f5c8 | 390 | free_percpu((void __percpu *) (unsigned long) pcnt); |
71ae0dff FW |
391 | } |
392 | ||
393 | static inline struct xt_counters * | |
394 | xt_get_this_cpu_counter(struct xt_counters *cnt) | |
395 | { | |
396 | if (nr_cpu_ids > 1) | |
dcb8f5c8 | 397 | return this_cpu_ptr((void __percpu *) (unsigned long) cnt->pcnt); |
71ae0dff FW |
398 | |
399 | return cnt; | |
400 | } | |
401 | ||
402 | static inline struct xt_counters * | |
403 | xt_get_per_cpu_counter(struct xt_counters *cnt, unsigned int cpu) | |
404 | { | |
405 | if (nr_cpu_ids > 1) | |
dcb8f5c8 | 406 | return per_cpu_ptr((void __percpu *) (unsigned long) cnt->pcnt, cpu); |
71ae0dff FW |
407 | |
408 | return cnt; | |
409 | } | |
410 | ||
a0f4ecf3 JP |
411 | struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *); |
412 | void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *); | |
2b95efe7 | 413 | |
2722971c DM |
414 | #ifdef CONFIG_COMPAT |
415 | #include <net/compat.h> | |
416 | ||
d94d9fee | 417 | struct compat_xt_entry_match { |
2722971c DM |
418 | union { |
419 | struct { | |
420 | u_int16_t match_size; | |
421 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
422 | u_int8_t revision; | |
423 | } user; | |
46c5ea3c PM |
424 | struct { |
425 | u_int16_t match_size; | |
426 | compat_uptr_t match; | |
427 | } kernel; | |
2722971c DM |
428 | u_int16_t match_size; |
429 | } u; | |
430 | unsigned char data[0]; | |
431 | }; | |
432 | ||
d94d9fee | 433 | struct compat_xt_entry_target { |
2722971c DM |
434 | union { |
435 | struct { | |
436 | u_int16_t target_size; | |
437 | char name[XT_FUNCTION_MAXNAMELEN - 1]; | |
438 | u_int8_t revision; | |
439 | } user; | |
46c5ea3c PM |
440 | struct { |
441 | u_int16_t target_size; | |
442 | compat_uptr_t target; | |
443 | } kernel; | |
2722971c DM |
444 | u_int16_t target_size; |
445 | } u; | |
446 | unsigned char data[0]; | |
447 | }; | |
448 | ||
449 | /* FIXME: this works only on 32 bit tasks | |
450 | * need to change whole approach in order to calculate align as function of | |
451 | * current task alignment */ | |
452 | ||
d94d9fee | 453 | struct compat_xt_counters { |
0a026046 | 454 | compat_u64 pcnt, bcnt; /* Packet and byte counters */ |
2722971c DM |
455 | }; |
456 | ||
d94d9fee | 457 | struct compat_xt_counters_info { |
2722971c DM |
458 | char name[XT_TABLE_MAXNAMELEN]; |
459 | compat_uint_t num_counters; | |
460 | struct compat_xt_counters counters[0]; | |
461 | }; | |
462 | ||
42107f50 AD |
463 | struct _compat_xt_align { |
464 | __u8 u8; | |
465 | __u16 u16; | |
466 | __u32 u32; | |
467 | compat_u64 u64; | |
468 | }; | |
469 | ||
a79ff731 | 470 | #define COMPAT_XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _compat_xt_align)) |
2722971c | 471 | |
a0f4ecf3 JP |
472 | void xt_compat_lock(u_int8_t af); |
473 | void xt_compat_unlock(u_int8_t af); | |
474 | ||
475 | int xt_compat_add_offset(u_int8_t af, unsigned int offset, int delta); | |
476 | void xt_compat_flush_offsets(u_int8_t af); | |
477 | void xt_compat_init_offsets(u_int8_t af, unsigned int number); | |
478 | int xt_compat_calc_jump(u_int8_t af, unsigned int offset); | |
479 | ||
480 | int xt_compat_match_offset(const struct xt_match *match); | |
481 | int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr, | |
482 | unsigned int *size); | |
483 | int xt_compat_match_to_user(const struct xt_entry_match *m, | |
484 | void __user **dstptr, unsigned int *size); | |
485 | ||
486 | int xt_compat_target_offset(const struct xt_target *target); | |
487 | void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr, | |
488 | unsigned int *size); | |
489 | int xt_compat_target_to_user(const struct xt_entry_target *t, | |
490 | void __user **dstptr, unsigned int *size); | |
2722971c DM |
491 | |
492 | #endif /* CONFIG_COMPAT */ | |
2e4e6a17 | 493 | #endif /* _X_TABLES_H */ |