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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_NF_TABLES_H
3 #define _NET_NF_TABLES_H
4
5 #include <asm/unaligned.h>
6 #include <linux/list.h>
7 #include <linux/netfilter.h>
8 #include <linux/netfilter/nfnetlink.h>
9 #include <linux/netfilter/x_tables.h>
10 #include <linux/netfilter/nf_tables.h>
11 #include <linux/u64_stats_sync.h>
12 #include <linux/rhashtable.h>
13 #include <net/netfilter/nf_flow_table.h>
14 #include <net/netlink.h>
15 #include <net/flow_offload.h>
16 #include <net/netns/generic.h>
17
18 #define NFT_MAX_HOOKS (NF_INET_INGRESS + 1)
19
20 struct module;
21
22 #define NFT_JUMP_STACK_SIZE 16
23
24 struct nft_pktinfo {
25 struct sk_buff *skb;
26 bool tprot_set;
27 u8 tprot;
28 /* for x_tables compatibility */
29 struct xt_action_param xt;
30 };
31
32 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
33 {
34 return pkt->xt.state->net;
35 }
36
37 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
38 {
39 return pkt->xt.state->hook;
40 }
41
42 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
43 {
44 return pkt->xt.state->pf;
45 }
46
47 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
48 {
49 return pkt->xt.state->in;
50 }
51
52 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
53 {
54 return pkt->xt.state->out;
55 }
56
57 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
58 struct sk_buff *skb,
59 const struct nf_hook_state *state)
60 {
61 pkt->skb = skb;
62 pkt->xt.state = state;
63 }
64
65 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt,
66 struct sk_buff *skb)
67 {
68 pkt->tprot_set = false;
69 pkt->tprot = 0;
70 pkt->xt.thoff = 0;
71 pkt->xt.fragoff = 0;
72 }
73
74 /**
75 * struct nft_verdict - nf_tables verdict
76 *
77 * @code: nf_tables/netfilter verdict code
78 * @chain: destination chain for NFT_JUMP/NFT_GOTO
79 */
80 struct nft_verdict {
81 u32 code;
82 struct nft_chain *chain;
83 };
84
85 struct nft_data {
86 union {
87 u32 data[4];
88 struct nft_verdict verdict;
89 };
90 } __attribute__((aligned(__alignof__(u64))));
91
92 /**
93 * struct nft_regs - nf_tables register set
94 *
95 * @data: data registers
96 * @verdict: verdict register
97 *
98 * The first four data registers alias to the verdict register.
99 */
100 struct nft_regs {
101 union {
102 u32 data[20];
103 struct nft_verdict verdict;
104 };
105 };
106
107 /* Store/load an u8, u16 or u64 integer to/from the u32 data register.
108 *
109 * Note, when using concatenations, register allocation happens at 32-bit
110 * level. So for store instruction, pad the rest part with zero to avoid
111 * garbage values.
112 */
113
114 static inline void nft_reg_store8(u32 *dreg, u8 val)
115 {
116 *dreg = 0;
117 *(u8 *)dreg = val;
118 }
119
120 static inline u8 nft_reg_load8(const u32 *sreg)
121 {
122 return *(u8 *)sreg;
123 }
124
125 static inline void nft_reg_store16(u32 *dreg, u16 val)
126 {
127 *dreg = 0;
128 *(u16 *)dreg = val;
129 }
130
131 static inline u16 nft_reg_load16(const u32 *sreg)
132 {
133 return *(u16 *)sreg;
134 }
135
136 static inline void nft_reg_store64(u32 *dreg, u64 val)
137 {
138 put_unaligned(val, (u64 *)dreg);
139 }
140
141 static inline u64 nft_reg_load64(const u32 *sreg)
142 {
143 return get_unaligned((u64 *)sreg);
144 }
145
146 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
147 unsigned int len)
148 {
149 if (len % NFT_REG32_SIZE)
150 dst[len / NFT_REG32_SIZE] = 0;
151 memcpy(dst, src, len);
152 }
153
154 /**
155 * struct nft_ctx - nf_tables rule/set context
156 *
157 * @net: net namespace
158 * @table: the table the chain is contained in
159 * @chain: the chain the rule is contained in
160 * @nla: netlink attributes
161 * @portid: netlink portID of the original message
162 * @seq: netlink sequence number
163 * @family: protocol family
164 * @level: depth of the chains
165 * @report: notify via unicast netlink message
166 */
167 struct nft_ctx {
168 struct net *net;
169 struct nft_table *table;
170 struct nft_chain *chain;
171 const struct nlattr * const *nla;
172 u32 portid;
173 u32 seq;
174 u16 flags;
175 u8 family;
176 u8 level;
177 bool report;
178 };
179
180 struct nft_data_desc {
181 enum nft_data_types type;
182 unsigned int len;
183 };
184
185 int nft_data_init(const struct nft_ctx *ctx,
186 struct nft_data *data, unsigned int size,
187 struct nft_data_desc *desc, const struct nlattr *nla);
188 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
189 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
190 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
191 enum nft_data_types type, unsigned int len);
192
193 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
194 {
195 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
196 }
197
198 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
199 {
200 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
201 }
202
203 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
204 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
205
206 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len);
207 int nft_parse_register_store(const struct nft_ctx *ctx,
208 const struct nlattr *attr, u8 *dreg,
209 const struct nft_data *data,
210 enum nft_data_types type, unsigned int len);
211
212 /**
213 * struct nft_userdata - user defined data associated with an object
214 *
215 * @len: length of the data
216 * @data: content
217 *
218 * The presence of user data is indicated in an object specific fashion,
219 * so a length of zero can't occur and the value "len" indicates data
220 * of length len + 1.
221 */
222 struct nft_userdata {
223 u8 len;
224 unsigned char data[];
225 };
226
227 /**
228 * struct nft_set_elem - generic representation of set elements
229 *
230 * @key: element key
231 * @key_end: closing element key
232 * @priv: element private data and extensions
233 */
234 struct nft_set_elem {
235 union {
236 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
237 struct nft_data val;
238 } key;
239 union {
240 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
241 struct nft_data val;
242 } key_end;
243 union {
244 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
245 struct nft_data val;
246 } data;
247 void *priv;
248 };
249
250 struct nft_set;
251 struct nft_set_iter {
252 u8 genmask;
253 unsigned int count;
254 unsigned int skip;
255 int err;
256 int (*fn)(const struct nft_ctx *ctx,
257 struct nft_set *set,
258 const struct nft_set_iter *iter,
259 struct nft_set_elem *elem);
260 };
261
262 /**
263 * struct nft_set_desc - description of set elements
264 *
265 * @klen: key length
266 * @dlen: data length
267 * @size: number of set elements
268 * @field_len: length of each field in concatenation, bytes
269 * @field_count: number of concatenated fields in element
270 * @expr: set must support for expressions
271 */
272 struct nft_set_desc {
273 unsigned int klen;
274 unsigned int dlen;
275 unsigned int size;
276 u8 field_len[NFT_REG32_COUNT];
277 u8 field_count;
278 bool expr;
279 };
280
281 /**
282 * enum nft_set_class - performance class
283 *
284 * @NFT_LOOKUP_O_1: constant, O(1)
285 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
286 * @NFT_LOOKUP_O_N: linear, O(N)
287 */
288 enum nft_set_class {
289 NFT_SET_CLASS_O_1,
290 NFT_SET_CLASS_O_LOG_N,
291 NFT_SET_CLASS_O_N,
292 };
293
294 /**
295 * struct nft_set_estimate - estimation of memory and performance
296 * characteristics
297 *
298 * @size: required memory
299 * @lookup: lookup performance class
300 * @space: memory class
301 */
302 struct nft_set_estimate {
303 u64 size;
304 enum nft_set_class lookup;
305 enum nft_set_class space;
306 };
307
308 #define NFT_EXPR_MAXATTR 16
309 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
310 ALIGN(size, __alignof__(struct nft_expr)))
311
312 /**
313 * struct nft_expr - nf_tables expression
314 *
315 * @ops: expression ops
316 * @data: expression private data
317 */
318 struct nft_expr {
319 const struct nft_expr_ops *ops;
320 unsigned char data[]
321 __attribute__((aligned(__alignof__(u64))));
322 };
323
324 static inline void *nft_expr_priv(const struct nft_expr *expr)
325 {
326 return (void *)expr->data;
327 }
328
329 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src);
330 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
331 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
332 const struct nft_expr *expr);
333
334 struct nft_set_ext;
335
336 /**
337 * struct nft_set_ops - nf_tables set operations
338 *
339 * @lookup: look up an element within the set
340 * @update: update an element if exists, add it if doesn't exist
341 * @delete: delete an element
342 * @insert: insert new element into set
343 * @activate: activate new element in the next generation
344 * @deactivate: lookup for element and deactivate it in the next generation
345 * @flush: deactivate element in the next generation
346 * @remove: remove element from set
347 * @walk: iterate over all set elements
348 * @get: get set elements
349 * @privsize: function to return size of set private data
350 * @init: initialize private data of new set instance
351 * @destroy: destroy private data of set instance
352 * @elemsize: element private size
353 *
354 * Operations lookup, update and delete have simpler interfaces, are faster
355 * and currently only used in the packet path. All the rest are slower,
356 * control plane functions.
357 */
358 struct nft_set_ops {
359 bool (*lookup)(const struct net *net,
360 const struct nft_set *set,
361 const u32 *key,
362 const struct nft_set_ext **ext);
363 bool (*update)(struct nft_set *set,
364 const u32 *key,
365 void *(*new)(struct nft_set *,
366 const struct nft_expr *,
367 struct nft_regs *),
368 const struct nft_expr *expr,
369 struct nft_regs *regs,
370 const struct nft_set_ext **ext);
371 bool (*delete)(const struct nft_set *set,
372 const u32 *key);
373
374 int (*insert)(const struct net *net,
375 const struct nft_set *set,
376 const struct nft_set_elem *elem,
377 struct nft_set_ext **ext);
378 void (*activate)(const struct net *net,
379 const struct nft_set *set,
380 const struct nft_set_elem *elem);
381 void * (*deactivate)(const struct net *net,
382 const struct nft_set *set,
383 const struct nft_set_elem *elem);
384 bool (*flush)(const struct net *net,
385 const struct nft_set *set,
386 void *priv);
387 void (*remove)(const struct net *net,
388 const struct nft_set *set,
389 const struct nft_set_elem *elem);
390 void (*walk)(const struct nft_ctx *ctx,
391 struct nft_set *set,
392 struct nft_set_iter *iter);
393 void * (*get)(const struct net *net,
394 const struct nft_set *set,
395 const struct nft_set_elem *elem,
396 unsigned int flags);
397
398 u64 (*privsize)(const struct nlattr * const nla[],
399 const struct nft_set_desc *desc);
400 bool (*estimate)(const struct nft_set_desc *desc,
401 u32 features,
402 struct nft_set_estimate *est);
403 int (*init)(const struct nft_set *set,
404 const struct nft_set_desc *desc,
405 const struct nlattr * const nla[]);
406 void (*destroy)(const struct nft_set *set);
407 void (*gc_init)(const struct nft_set *set);
408
409 unsigned int elemsize;
410 };
411
412 /**
413 * struct nft_set_type - nf_tables set type
414 *
415 * @ops: set ops for this type
416 * @features: features supported by the implementation
417 */
418 struct nft_set_type {
419 const struct nft_set_ops ops;
420 u32 features;
421 };
422 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
423
424 struct nft_set_elem_expr {
425 u8 size;
426 unsigned char data[]
427 __attribute__((aligned(__alignof__(struct nft_expr))));
428 };
429
430 #define nft_setelem_expr_at(__elem_expr, __offset) \
431 ((struct nft_expr *)&__elem_expr->data[__offset])
432
433 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
434 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
435 __size < (__elem_expr)->size; \
436 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
437
438 #define NFT_SET_EXPR_MAX 2
439
440 /**
441 * struct nft_set - nf_tables set instance
442 *
443 * @list: table set list node
444 * @bindings: list of set bindings
445 * @table: table this set belongs to
446 * @net: netnamespace this set belongs to
447 * @name: name of the set
448 * @handle: unique handle of the set
449 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
450 * @dtype: data type (verdict or numeric type defined by userspace)
451 * @objtype: object type (see NFT_OBJECT_* definitions)
452 * @size: maximum set size
453 * @field_len: length of each field in concatenation, bytes
454 * @field_count: number of concatenated fields in element
455 * @use: number of rules references to this set
456 * @nelems: number of elements
457 * @ndeact: number of deactivated elements queued for removal
458 * @timeout: default timeout value in jiffies
459 * @gc_int: garbage collection interval in msecs
460 * @policy: set parameterization (see enum nft_set_policies)
461 * @udlen: user data length
462 * @udata: user data
463 * @expr: stateful expression
464 * @ops: set ops
465 * @flags: set flags
466 * @genmask: generation mask
467 * @klen: key length
468 * @dlen: data length
469 * @data: private set data
470 */
471 struct nft_set {
472 struct list_head list;
473 struct list_head bindings;
474 struct nft_table *table;
475 possible_net_t net;
476 char *name;
477 u64 handle;
478 u32 ktype;
479 u32 dtype;
480 u32 objtype;
481 u32 size;
482 u8 field_len[NFT_REG32_COUNT];
483 u8 field_count;
484 u32 use;
485 atomic_t nelems;
486 u32 ndeact;
487 u64 timeout;
488 u32 gc_int;
489 u16 policy;
490 u16 udlen;
491 unsigned char *udata;
492 /* runtime data below here */
493 const struct nft_set_ops *ops ____cacheline_aligned;
494 u16 flags:14,
495 genmask:2;
496 u8 klen;
497 u8 dlen;
498 u8 num_exprs;
499 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
500 unsigned char data[]
501 __attribute__((aligned(__alignof__(u64))));
502 };
503
504 static inline bool nft_set_is_anonymous(const struct nft_set *set)
505 {
506 return set->flags & NFT_SET_ANONYMOUS;
507 }
508
509 static inline void *nft_set_priv(const struct nft_set *set)
510 {
511 return (void *)set->data;
512 }
513
514 static inline struct nft_set *nft_set_container_of(const void *priv)
515 {
516 return (void *)priv - offsetof(struct nft_set, data);
517 }
518
519 struct nft_set *nft_set_lookup_global(const struct net *net,
520 const struct nft_table *table,
521 const struct nlattr *nla_set_name,
522 const struct nlattr *nla_set_id,
523 u8 genmask);
524
525 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
526 {
527 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
528 }
529
530 /**
531 * struct nft_set_binding - nf_tables set binding
532 *
533 * @list: set bindings list node
534 * @chain: chain containing the rule bound to the set
535 * @flags: set action flags
536 *
537 * A set binding contains all information necessary for validation
538 * of new elements added to a bound set.
539 */
540 struct nft_set_binding {
541 struct list_head list;
542 const struct nft_chain *chain;
543 u32 flags;
544 };
545
546 enum nft_trans_phase;
547 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
548 struct nft_set_binding *binding,
549 enum nft_trans_phase phase);
550 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
551 struct nft_set_binding *binding);
552 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
553
554 /**
555 * enum nft_set_extensions - set extension type IDs
556 *
557 * @NFT_SET_EXT_KEY: element key
558 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
559 * @NFT_SET_EXT_DATA: mapping data
560 * @NFT_SET_EXT_FLAGS: element flags
561 * @NFT_SET_EXT_TIMEOUT: element timeout
562 * @NFT_SET_EXT_EXPIRATION: element expiration time
563 * @NFT_SET_EXT_USERDATA: user data associated with the element
564 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element
565 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
566 * @NFT_SET_EXT_NUM: number of extension types
567 */
568 enum nft_set_extensions {
569 NFT_SET_EXT_KEY,
570 NFT_SET_EXT_KEY_END,
571 NFT_SET_EXT_DATA,
572 NFT_SET_EXT_FLAGS,
573 NFT_SET_EXT_TIMEOUT,
574 NFT_SET_EXT_EXPIRATION,
575 NFT_SET_EXT_USERDATA,
576 NFT_SET_EXT_EXPRESSIONS,
577 NFT_SET_EXT_OBJREF,
578 NFT_SET_EXT_NUM
579 };
580
581 /**
582 * struct nft_set_ext_type - set extension type
583 *
584 * @len: fixed part length of the extension
585 * @align: alignment requirements of the extension
586 */
587 struct nft_set_ext_type {
588 u8 len;
589 u8 align;
590 };
591
592 extern const struct nft_set_ext_type nft_set_ext_types[];
593
594 /**
595 * struct nft_set_ext_tmpl - set extension template
596 *
597 * @len: length of extension area
598 * @offset: offsets of individual extension types
599 */
600 struct nft_set_ext_tmpl {
601 u16 len;
602 u8 offset[NFT_SET_EXT_NUM];
603 };
604
605 /**
606 * struct nft_set_ext - set extensions
607 *
608 * @genmask: generation mask
609 * @offset: offsets of individual extension types
610 * @data: beginning of extension data
611 */
612 struct nft_set_ext {
613 u8 genmask;
614 u8 offset[NFT_SET_EXT_NUM];
615 char data[];
616 };
617
618 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
619 {
620 memset(tmpl, 0, sizeof(*tmpl));
621 tmpl->len = sizeof(struct nft_set_ext);
622 }
623
624 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
625 unsigned int len)
626 {
627 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
628 BUG_ON(tmpl->len > U8_MAX);
629 tmpl->offset[id] = tmpl->len;
630 tmpl->len += nft_set_ext_types[id].len + len;
631 }
632
633 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
634 {
635 nft_set_ext_add_length(tmpl, id, 0);
636 }
637
638 static inline void nft_set_ext_init(struct nft_set_ext *ext,
639 const struct nft_set_ext_tmpl *tmpl)
640 {
641 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
642 }
643
644 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
645 {
646 return !!ext->offset[id];
647 }
648
649 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
650 {
651 return ext && __nft_set_ext_exists(ext, id);
652 }
653
654 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
655 {
656 return (void *)ext + ext->offset[id];
657 }
658
659 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
660 {
661 return nft_set_ext(ext, NFT_SET_EXT_KEY);
662 }
663
664 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
665 {
666 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
667 }
668
669 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
670 {
671 return nft_set_ext(ext, NFT_SET_EXT_DATA);
672 }
673
674 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
675 {
676 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
677 }
678
679 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
680 {
681 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
682 }
683
684 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext)
685 {
686 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
687 }
688
689 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
690 {
691 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
692 }
693
694 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
695 {
696 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
697 }
698
699 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
700 {
701 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
702 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext));
703 }
704
705 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
706 void *elem)
707 {
708 return elem + set->ops->elemsize;
709 }
710
711 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
712 {
713 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
714 }
715
716 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
717 const struct nft_set *set,
718 const struct nlattr *attr);
719
720 void *nft_set_elem_init(const struct nft_set *set,
721 const struct nft_set_ext_tmpl *tmpl,
722 const u32 *key, const u32 *key_end, const u32 *data,
723 u64 timeout, u64 expiration, gfp_t gfp);
724 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
725 struct nft_expr *expr_array[]);
726 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
727 bool destroy_expr);
728
729 /**
730 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
731 *
732 * @rcu: rcu head
733 * @set: set the elements belong to
734 * @cnt: count of elements
735 */
736 struct nft_set_gc_batch_head {
737 struct rcu_head rcu;
738 const struct nft_set *set;
739 unsigned int cnt;
740 };
741
742 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
743 sizeof(struct nft_set_gc_batch_head)) / \
744 sizeof(void *))
745
746 /**
747 * struct nft_set_gc_batch - nf_tables set garbage collection batch
748 *
749 * @head: GC batch head
750 * @elems: garbage collection elements
751 */
752 struct nft_set_gc_batch {
753 struct nft_set_gc_batch_head head;
754 void *elems[NFT_SET_GC_BATCH_SIZE];
755 };
756
757 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
758 gfp_t gfp);
759 void nft_set_gc_batch_release(struct rcu_head *rcu);
760
761 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
762 {
763 if (gcb != NULL)
764 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
765 }
766
767 static inline struct nft_set_gc_batch *
768 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
769 gfp_t gfp)
770 {
771 if (gcb != NULL) {
772 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
773 return gcb;
774 nft_set_gc_batch_complete(gcb);
775 }
776 return nft_set_gc_batch_alloc(set, gfp);
777 }
778
779 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
780 void *elem)
781 {
782 gcb->elems[gcb->head.cnt++] = elem;
783 }
784
785 struct nft_expr_ops;
786 /**
787 * struct nft_expr_type - nf_tables expression type
788 *
789 * @select_ops: function to select nft_expr_ops
790 * @release_ops: release nft_expr_ops
791 * @ops: default ops, used when no select_ops functions is present
792 * @list: used internally
793 * @name: Identifier
794 * @owner: module reference
795 * @policy: netlink attribute policy
796 * @maxattr: highest netlink attribute number
797 * @family: address family for AF-specific types
798 * @flags: expression type flags
799 */
800 struct nft_expr_type {
801 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
802 const struct nlattr * const tb[]);
803 void (*release_ops)(const struct nft_expr_ops *ops);
804 const struct nft_expr_ops *ops;
805 struct list_head list;
806 const char *name;
807 struct module *owner;
808 const struct nla_policy *policy;
809 unsigned int maxattr;
810 u8 family;
811 u8 flags;
812 };
813
814 #define NFT_EXPR_STATEFUL 0x1
815 #define NFT_EXPR_GC 0x2
816
817 enum nft_trans_phase {
818 NFT_TRANS_PREPARE,
819 NFT_TRANS_ABORT,
820 NFT_TRANS_COMMIT,
821 NFT_TRANS_RELEASE
822 };
823
824 struct nft_flow_rule;
825 struct nft_offload_ctx;
826
827 /**
828 * struct nft_expr_ops - nf_tables expression operations
829 *
830 * @eval: Expression evaluation function
831 * @size: full expression size, including private data size
832 * @init: initialization function
833 * @activate: activate expression in the next generation
834 * @deactivate: deactivate expression in next generation
835 * @destroy: destruction function, called after synchronize_rcu
836 * @dump: function to dump parameters
837 * @type: expression type
838 * @validate: validate expression, called during loop detection
839 * @data: extra data to attach to this expression operation
840 */
841 struct nft_expr_ops {
842 void (*eval)(const struct nft_expr *expr,
843 struct nft_regs *regs,
844 const struct nft_pktinfo *pkt);
845 int (*clone)(struct nft_expr *dst,
846 const struct nft_expr *src);
847 unsigned int size;
848
849 int (*init)(const struct nft_ctx *ctx,
850 const struct nft_expr *expr,
851 const struct nlattr * const tb[]);
852 void (*activate)(const struct nft_ctx *ctx,
853 const struct nft_expr *expr);
854 void (*deactivate)(const struct nft_ctx *ctx,
855 const struct nft_expr *expr,
856 enum nft_trans_phase phase);
857 void (*destroy)(const struct nft_ctx *ctx,
858 const struct nft_expr *expr);
859 void (*destroy_clone)(const struct nft_ctx *ctx,
860 const struct nft_expr *expr);
861 int (*dump)(struct sk_buff *skb,
862 const struct nft_expr *expr);
863 int (*validate)(const struct nft_ctx *ctx,
864 const struct nft_expr *expr,
865 const struct nft_data **data);
866 bool (*gc)(struct net *net,
867 const struct nft_expr *expr);
868 int (*offload)(struct nft_offload_ctx *ctx,
869 struct nft_flow_rule *flow,
870 const struct nft_expr *expr);
871 void (*offload_stats)(struct nft_expr *expr,
872 const struct flow_stats *stats);
873 u32 offload_flags;
874 const struct nft_expr_type *type;
875 void *data;
876 };
877
878 /**
879 * struct nft_rule - nf_tables rule
880 *
881 * @list: used internally
882 * @handle: rule handle
883 * @genmask: generation mask
884 * @dlen: length of expression data
885 * @udata: user data is appended to the rule
886 * @data: expression data
887 */
888 struct nft_rule {
889 struct list_head list;
890 u64 handle:42,
891 genmask:2,
892 dlen:12,
893 udata:1;
894 unsigned char data[]
895 __attribute__((aligned(__alignof__(struct nft_expr))));
896 };
897
898 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
899 {
900 return (struct nft_expr *)&rule->data[0];
901 }
902
903 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
904 {
905 return ((void *)expr) + expr->ops->size;
906 }
907
908 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
909 {
910 return (struct nft_expr *)&rule->data[rule->dlen];
911 }
912
913 static inline bool nft_expr_more(const struct nft_rule *rule,
914 const struct nft_expr *expr)
915 {
916 return expr != nft_expr_last(rule) && expr->ops;
917 }
918
919 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
920 {
921 return (void *)&rule->data[rule->dlen];
922 }
923
924 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule);
925
926 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
927 struct nft_regs *regs,
928 const struct nft_pktinfo *pkt)
929 {
930 struct nft_set_elem_expr *elem_expr;
931 struct nft_expr *expr;
932 u32 size;
933
934 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
935 elem_expr = nft_set_ext_expr(ext);
936 nft_setelem_expr_foreach(expr, elem_expr, size) {
937 expr->ops->eval(expr, regs, pkt);
938 if (regs->verdict.code == NFT_BREAK)
939 return;
940 }
941 }
942 }
943
944 /*
945 * The last pointer isn't really necessary, but the compiler isn't able to
946 * determine that the result of nft_expr_last() is always the same since it
947 * can't assume that the dlen value wasn't changed within calls in the loop.
948 */
949 #define nft_rule_for_each_expr(expr, last, rule) \
950 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
951 (expr) != (last); \
952 (expr) = nft_expr_next(expr))
953
954 #define NFT_CHAIN_POLICY_UNSET U8_MAX
955
956 /**
957 * struct nft_chain - nf_tables chain
958 *
959 * @rules: list of rules in the chain
960 * @list: used internally
961 * @rhlhead: used internally
962 * @table: table that this chain belongs to
963 * @handle: chain handle
964 * @use: number of jump references to this chain
965 * @flags: bitmask of enum nft_chain_flags
966 * @name: name of the chain
967 */
968 struct nft_chain {
969 struct nft_rule *__rcu *rules_gen_0;
970 struct nft_rule *__rcu *rules_gen_1;
971 struct list_head rules;
972 struct list_head list;
973 struct rhlist_head rhlhead;
974 struct nft_table *table;
975 u64 handle;
976 u32 use;
977 u8 flags:5,
978 bound:1,
979 genmask:2;
980 char *name;
981 u16 udlen;
982 u8 *udata;
983
984 /* Only used during control plane commit phase: */
985 struct nft_rule **rules_next;
986 };
987
988 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
989
990 enum nft_chain_types {
991 NFT_CHAIN_T_DEFAULT = 0,
992 NFT_CHAIN_T_ROUTE,
993 NFT_CHAIN_T_NAT,
994 NFT_CHAIN_T_MAX
995 };
996
997 /**
998 * struct nft_chain_type - nf_tables chain type info
999 *
1000 * @name: name of the type
1001 * @type: numeric identifier
1002 * @family: address family
1003 * @owner: module owner
1004 * @hook_mask: mask of valid hooks
1005 * @hooks: array of hook functions
1006 * @ops_register: base chain register function
1007 * @ops_unregister: base chain unregister function
1008 */
1009 struct nft_chain_type {
1010 const char *name;
1011 enum nft_chain_types type;
1012 int family;
1013 struct module *owner;
1014 unsigned int hook_mask;
1015 nf_hookfn *hooks[NFT_MAX_HOOKS];
1016 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1017 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1018 };
1019
1020 int nft_chain_validate_dependency(const struct nft_chain *chain,
1021 enum nft_chain_types type);
1022 int nft_chain_validate_hooks(const struct nft_chain *chain,
1023 unsigned int hook_flags);
1024
1025 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1026 {
1027 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1028 }
1029
1030 void nft_chain_del(struct nft_chain *chain);
1031 void nf_tables_chain_destroy(struct nft_ctx *ctx);
1032
1033 struct nft_stats {
1034 u64 bytes;
1035 u64 pkts;
1036 struct u64_stats_sync syncp;
1037 };
1038
1039 struct nft_hook {
1040 struct list_head list;
1041 bool inactive;
1042 struct nf_hook_ops ops;
1043 struct rcu_head rcu;
1044 };
1045
1046 /**
1047 * struct nft_base_chain - nf_tables base chain
1048 *
1049 * @ops: netfilter hook ops
1050 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1051 * @type: chain type
1052 * @policy: default policy
1053 * @stats: per-cpu chain stats
1054 * @chain: the chain
1055 * @flow_block: flow block (for hardware offload)
1056 */
1057 struct nft_base_chain {
1058 struct nf_hook_ops ops;
1059 struct list_head hook_list;
1060 const struct nft_chain_type *type;
1061 u8 policy;
1062 u8 flags;
1063 struct nft_stats __percpu *stats;
1064 struct nft_chain chain;
1065 struct flow_block flow_block;
1066 };
1067
1068 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1069 {
1070 return container_of(chain, struct nft_base_chain, chain);
1071 }
1072
1073 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1074 {
1075 return chain->flags & NFT_CHAIN_BASE;
1076 }
1077
1078 int __nft_release_basechain(struct nft_ctx *ctx);
1079
1080 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1081
1082 /**
1083 * struct nft_table - nf_tables table
1084 *
1085 * @list: used internally
1086 * @chains_ht: chains in the table
1087 * @chains: same, for stable walks
1088 * @sets: sets in the table
1089 * @objects: stateful objects in the table
1090 * @flowtables: flow tables in the table
1091 * @hgenerator: handle generator state
1092 * @handle: table handle
1093 * @use: number of chain references to this table
1094 * @flags: table flag (see enum nft_table_flags)
1095 * @genmask: generation mask
1096 * @afinfo: address family info
1097 * @name: name of the table
1098 */
1099 struct nft_table {
1100 struct list_head list;
1101 struct rhltable chains_ht;
1102 struct list_head chains;
1103 struct list_head sets;
1104 struct list_head objects;
1105 struct list_head flowtables;
1106 u64 hgenerator;
1107 u64 handle;
1108 u32 use;
1109 u16 family:6,
1110 flags:8,
1111 genmask:2;
1112 u32 nlpid;
1113 char *name;
1114 u16 udlen;
1115 u8 *udata;
1116 };
1117
1118 static inline bool nft_table_has_owner(const struct nft_table *table)
1119 {
1120 return table->flags & NFT_TABLE_F_OWNER;
1121 }
1122
1123 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1124 {
1125 return family == NFPROTO_NETDEV ||
1126 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1127 }
1128
1129 void nft_register_chain_type(const struct nft_chain_type *);
1130 void nft_unregister_chain_type(const struct nft_chain_type *);
1131
1132 int nft_register_expr(struct nft_expr_type *);
1133 void nft_unregister_expr(struct nft_expr_type *);
1134
1135 int nft_verdict_dump(struct sk_buff *skb, int type,
1136 const struct nft_verdict *v);
1137
1138 /**
1139 * struct nft_object_hash_key - key to lookup nft_object
1140 *
1141 * @name: name of the stateful object to look up
1142 * @table: table the object belongs to
1143 */
1144 struct nft_object_hash_key {
1145 const char *name;
1146 const struct nft_table *table;
1147 };
1148
1149 /**
1150 * struct nft_object - nf_tables stateful object
1151 *
1152 * @list: table stateful object list node
1153 * @key: keys that identify this object
1154 * @rhlhead: nft_objname_ht node
1155 * @genmask: generation mask
1156 * @use: number of references to this stateful object
1157 * @handle: unique object handle
1158 * @ops: object operations
1159 * @data: object data, layout depends on type
1160 */
1161 struct nft_object {
1162 struct list_head list;
1163 struct rhlist_head rhlhead;
1164 struct nft_object_hash_key key;
1165 u32 genmask:2,
1166 use:30;
1167 u64 handle;
1168 u16 udlen;
1169 u8 *udata;
1170 /* runtime data below here */
1171 const struct nft_object_ops *ops ____cacheline_aligned;
1172 unsigned char data[]
1173 __attribute__((aligned(__alignof__(u64))));
1174 };
1175
1176 static inline void *nft_obj_data(const struct nft_object *obj)
1177 {
1178 return (void *)obj->data;
1179 }
1180
1181 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1182
1183 struct nft_object *nft_obj_lookup(const struct net *net,
1184 const struct nft_table *table,
1185 const struct nlattr *nla, u32 objtype,
1186 u8 genmask);
1187
1188 void nft_obj_notify(struct net *net, const struct nft_table *table,
1189 struct nft_object *obj, u32 portid, u32 seq,
1190 int event, int family, int report, gfp_t gfp);
1191
1192 /**
1193 * struct nft_object_type - stateful object type
1194 *
1195 * @select_ops: function to select nft_object_ops
1196 * @ops: default ops, used when no select_ops functions is present
1197 * @list: list node in list of object types
1198 * @type: stateful object numeric type
1199 * @owner: module owner
1200 * @maxattr: maximum netlink attribute
1201 * @policy: netlink attribute policy
1202 */
1203 struct nft_object_type {
1204 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1205 const struct nlattr * const tb[]);
1206 const struct nft_object_ops *ops;
1207 struct list_head list;
1208 u32 type;
1209 unsigned int maxattr;
1210 struct module *owner;
1211 const struct nla_policy *policy;
1212 };
1213
1214 /**
1215 * struct nft_object_ops - stateful object operations
1216 *
1217 * @eval: stateful object evaluation function
1218 * @size: stateful object size
1219 * @init: initialize object from netlink attributes
1220 * @destroy: release existing stateful object
1221 * @dump: netlink dump stateful object
1222 * @update: update stateful object
1223 */
1224 struct nft_object_ops {
1225 void (*eval)(struct nft_object *obj,
1226 struct nft_regs *regs,
1227 const struct nft_pktinfo *pkt);
1228 unsigned int size;
1229 int (*init)(const struct nft_ctx *ctx,
1230 const struct nlattr *const tb[],
1231 struct nft_object *obj);
1232 void (*destroy)(const struct nft_ctx *ctx,
1233 struct nft_object *obj);
1234 int (*dump)(struct sk_buff *skb,
1235 struct nft_object *obj,
1236 bool reset);
1237 void (*update)(struct nft_object *obj,
1238 struct nft_object *newobj);
1239 const struct nft_object_type *type;
1240 };
1241
1242 int nft_register_obj(struct nft_object_type *obj_type);
1243 void nft_unregister_obj(struct nft_object_type *obj_type);
1244
1245 #define NFT_NETDEVICE_MAX 256
1246
1247 /**
1248 * struct nft_flowtable - nf_tables flow table
1249 *
1250 * @list: flow table list node in table list
1251 * @table: the table the flow table is contained in
1252 * @name: name of this flow table
1253 * @hooknum: hook number
1254 * @ops_len: number of hooks in array
1255 * @genmask: generation mask
1256 * @use: number of references to this flow table
1257 * @handle: unique object handle
1258 * @dev_name: array of device names
1259 * @data: rhashtable and garbage collector
1260 * @ops: array of hooks
1261 */
1262 struct nft_flowtable {
1263 struct list_head list;
1264 struct nft_table *table;
1265 char *name;
1266 int hooknum;
1267 int ops_len;
1268 u32 genmask:2,
1269 use:30;
1270 u64 handle;
1271 /* runtime data below here */
1272 struct list_head hook_list ____cacheline_aligned;
1273 struct nf_flowtable data;
1274 };
1275
1276 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
1277 const struct nlattr *nla,
1278 u8 genmask);
1279
1280 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1281 struct nft_flowtable *flowtable,
1282 enum nft_trans_phase phase);
1283
1284 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1285 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1286
1287 /**
1288 * struct nft_traceinfo - nft tracing information and state
1289 *
1290 * @pkt: pktinfo currently processed
1291 * @basechain: base chain currently processed
1292 * @chain: chain currently processed
1293 * @rule: rule that was evaluated
1294 * @verdict: verdict given by rule
1295 * @type: event type (enum nft_trace_types)
1296 * @packet_dumped: packet headers sent in a previous traceinfo message
1297 * @trace: other struct members are initialised
1298 */
1299 struct nft_traceinfo {
1300 const struct nft_pktinfo *pkt;
1301 const struct nft_base_chain *basechain;
1302 const struct nft_chain *chain;
1303 const struct nft_rule *rule;
1304 const struct nft_verdict *verdict;
1305 enum nft_trace_types type;
1306 bool packet_dumped;
1307 bool trace;
1308 };
1309
1310 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1311 const struct nft_verdict *verdict,
1312 const struct nft_chain *basechain);
1313
1314 void nft_trace_notify(struct nft_traceinfo *info);
1315
1316 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1317 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1318
1319 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1320 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1321
1322 #define MODULE_ALIAS_NFT_EXPR(name) \
1323 MODULE_ALIAS("nft-expr-" name)
1324
1325 #define MODULE_ALIAS_NFT_OBJ(type) \
1326 MODULE_ALIAS("nft-obj-" __stringify(type))
1327
1328 #if IS_ENABLED(CONFIG_NF_TABLES)
1329
1330 /*
1331 * The gencursor defines two generations, the currently active and the
1332 * next one. Objects contain a bitmask of 2 bits specifying the generations
1333 * they're active in. A set bit means they're inactive in the generation
1334 * represented by that bit.
1335 *
1336 * New objects start out as inactive in the current and active in the
1337 * next generation. When committing the ruleset the bitmask is cleared,
1338 * meaning they're active in all generations. When removing an object,
1339 * it is set inactive in the next generation. After committing the ruleset,
1340 * the objects are removed.
1341 */
1342 static inline unsigned int nft_gencursor_next(const struct net *net)
1343 {
1344 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1345 }
1346
1347 static inline u8 nft_genmask_next(const struct net *net)
1348 {
1349 return 1 << nft_gencursor_next(net);
1350 }
1351
1352 static inline u8 nft_genmask_cur(const struct net *net)
1353 {
1354 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1355 return 1 << READ_ONCE(net->nft.gencursor);
1356 }
1357
1358 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1359
1360 /*
1361 * Generic transaction helpers
1362 */
1363
1364 /* Check if this object is currently active. */
1365 #define nft_is_active(__net, __obj) \
1366 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1367
1368 /* Check if this object is active in the next generation. */
1369 #define nft_is_active_next(__net, __obj) \
1370 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1371
1372 /* This object becomes active in the next generation. */
1373 #define nft_activate_next(__net, __obj) \
1374 (__obj)->genmask = nft_genmask_cur(__net)
1375
1376 /* This object becomes inactive in the next generation. */
1377 #define nft_deactivate_next(__net, __obj) \
1378 (__obj)->genmask = nft_genmask_next(__net)
1379
1380 /* After committing the ruleset, clear the stale generation bit. */
1381 #define nft_clear(__net, __obj) \
1382 (__obj)->genmask &= ~nft_genmask_next(__net)
1383 #define nft_active_genmask(__obj, __genmask) \
1384 !((__obj)->genmask & __genmask)
1385
1386 /*
1387 * Set element transaction helpers
1388 */
1389
1390 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1391 u8 genmask)
1392 {
1393 return !(ext->genmask & genmask);
1394 }
1395
1396 static inline void nft_set_elem_change_active(const struct net *net,
1397 const struct nft_set *set,
1398 struct nft_set_ext *ext)
1399 {
1400 ext->genmask ^= nft_genmask_next(net);
1401 }
1402
1403 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1404
1405 /*
1406 * We use a free bit in the genmask field to indicate the element
1407 * is busy, meaning it is currently being processed either by
1408 * the netlink API or GC.
1409 *
1410 * Even though the genmask is only a single byte wide, this works
1411 * because the extension structure if fully constant once initialized,
1412 * so there are no non-atomic write accesses unless it is already
1413 * marked busy.
1414 */
1415 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1416
1417 #if defined(__LITTLE_ENDIAN_BITFIELD)
1418 #define NFT_SET_ELEM_BUSY_BIT 2
1419 #elif defined(__BIG_ENDIAN_BITFIELD)
1420 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1421 #else
1422 #error
1423 #endif
1424
1425 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
1426 {
1427 unsigned long *word = (unsigned long *)ext;
1428
1429 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1430 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
1431 }
1432
1433 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
1434 {
1435 unsigned long *word = (unsigned long *)ext;
1436
1437 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
1438 }
1439
1440 /**
1441 * struct nft_trans - nf_tables object update in transaction
1442 *
1443 * @list: used internally
1444 * @msg_type: message type
1445 * @put_net: ctx->net needs to be put
1446 * @ctx: transaction context
1447 * @data: internal information related to the transaction
1448 */
1449 struct nft_trans {
1450 struct list_head list;
1451 int msg_type;
1452 bool put_net;
1453 struct nft_ctx ctx;
1454 char data[];
1455 };
1456
1457 struct nft_trans_rule {
1458 struct nft_rule *rule;
1459 struct nft_flow_rule *flow;
1460 u32 rule_id;
1461 };
1462
1463 #define nft_trans_rule(trans) \
1464 (((struct nft_trans_rule *)trans->data)->rule)
1465 #define nft_trans_flow_rule(trans) \
1466 (((struct nft_trans_rule *)trans->data)->flow)
1467 #define nft_trans_rule_id(trans) \
1468 (((struct nft_trans_rule *)trans->data)->rule_id)
1469
1470 struct nft_trans_set {
1471 struct nft_set *set;
1472 u32 set_id;
1473 bool bound;
1474 };
1475
1476 #define nft_trans_set(trans) \
1477 (((struct nft_trans_set *)trans->data)->set)
1478 #define nft_trans_set_id(trans) \
1479 (((struct nft_trans_set *)trans->data)->set_id)
1480 #define nft_trans_set_bound(trans) \
1481 (((struct nft_trans_set *)trans->data)->bound)
1482
1483 struct nft_trans_chain {
1484 bool update;
1485 char *name;
1486 struct nft_stats __percpu *stats;
1487 u8 policy;
1488 u32 chain_id;
1489 };
1490
1491 #define nft_trans_chain_update(trans) \
1492 (((struct nft_trans_chain *)trans->data)->update)
1493 #define nft_trans_chain_name(trans) \
1494 (((struct nft_trans_chain *)trans->data)->name)
1495 #define nft_trans_chain_stats(trans) \
1496 (((struct nft_trans_chain *)trans->data)->stats)
1497 #define nft_trans_chain_policy(trans) \
1498 (((struct nft_trans_chain *)trans->data)->policy)
1499 #define nft_trans_chain_id(trans) \
1500 (((struct nft_trans_chain *)trans->data)->chain_id)
1501
1502 struct nft_trans_table {
1503 bool update;
1504 u8 state;
1505 u32 flags;
1506 };
1507
1508 #define nft_trans_table_update(trans) \
1509 (((struct nft_trans_table *)trans->data)->update)
1510 #define nft_trans_table_state(trans) \
1511 (((struct nft_trans_table *)trans->data)->state)
1512 #define nft_trans_table_flags(trans) \
1513 (((struct nft_trans_table *)trans->data)->flags)
1514
1515 struct nft_trans_elem {
1516 struct nft_set *set;
1517 struct nft_set_elem elem;
1518 bool bound;
1519 };
1520
1521 #define nft_trans_elem_set(trans) \
1522 (((struct nft_trans_elem *)trans->data)->set)
1523 #define nft_trans_elem(trans) \
1524 (((struct nft_trans_elem *)trans->data)->elem)
1525 #define nft_trans_elem_set_bound(trans) \
1526 (((struct nft_trans_elem *)trans->data)->bound)
1527
1528 struct nft_trans_obj {
1529 struct nft_object *obj;
1530 struct nft_object *newobj;
1531 bool update;
1532 };
1533
1534 #define nft_trans_obj(trans) \
1535 (((struct nft_trans_obj *)trans->data)->obj)
1536 #define nft_trans_obj_newobj(trans) \
1537 (((struct nft_trans_obj *)trans->data)->newobj)
1538 #define nft_trans_obj_update(trans) \
1539 (((struct nft_trans_obj *)trans->data)->update)
1540
1541 struct nft_trans_flowtable {
1542 struct nft_flowtable *flowtable;
1543 bool update;
1544 struct list_head hook_list;
1545 u32 flags;
1546 };
1547
1548 #define nft_trans_flowtable(trans) \
1549 (((struct nft_trans_flowtable *)trans->data)->flowtable)
1550 #define nft_trans_flowtable_update(trans) \
1551 (((struct nft_trans_flowtable *)trans->data)->update)
1552 #define nft_trans_flowtable_hooks(trans) \
1553 (((struct nft_trans_flowtable *)trans->data)->hook_list)
1554 #define nft_trans_flowtable_flags(trans) \
1555 (((struct nft_trans_flowtable *)trans->data)->flags)
1556
1557 int __init nft_chain_filter_init(void);
1558 void nft_chain_filter_fini(void);
1559
1560 void __init nft_chain_route_init(void);
1561 void nft_chain_route_fini(void);
1562
1563 void nf_tables_trans_destroy_flush_work(void);
1564
1565 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1566 __be64 nf_jiffies64_to_msecs(u64 input);
1567
1568 #ifdef CONFIG_MODULES
1569 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1570 #else
1571 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1572 #endif
1573
1574 struct nftables_pernet {
1575 struct list_head tables;
1576 struct list_head commit_list;
1577 struct list_head module_list;
1578 struct list_head notify_list;
1579 struct mutex commit_mutex;
1580 unsigned int base_seq;
1581 u8 validate_state;
1582 };
1583
1584 extern unsigned int nf_tables_net_id;
1585
1586 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1587 {
1588 return net_generic(net, nf_tables_net_id);
1589 }
1590
1591 #endif /* _NET_NF_TABLES_H */
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