1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_NF_TABLES_H
3 #define _NET_NF_TABLES_H
4
5 #include <linux/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 enum {
25 NFT_PKTINFO_L4PROTO = (1 << 0),
26 NFT_PKTINFO_INNER = (1 << 1),
27 NFT_PKTINFO_INNER_FULL = (1 << 2),
28 };
29
30 struct nft_pktinfo {
31 struct sk_buff *skb;
32 const struct nf_hook_state *state;
33 u8 flags;
34 u8 tprot;
35 u16 fragoff;
36 u16 thoff;
37 u16 inneroff;
38 };
39
nft_sk(const struct nft_pktinfo * pkt)40 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
41 {
42 return pkt->state->sk;
43 }
44
nft_thoff(const struct nft_pktinfo * pkt)45 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
46 {
47 return pkt->thoff;
48 }
49
nft_net(const struct nft_pktinfo * pkt)50 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
51 {
52 return pkt->state->net;
53 }
54
nft_hook(const struct nft_pktinfo * pkt)55 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
56 {
57 return pkt->state->hook;
58 }
59
nft_pf(const struct nft_pktinfo * pkt)60 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
61 {
62 return pkt->state->pf;
63 }
64
nft_in(const struct nft_pktinfo * pkt)65 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
66 {
67 return pkt->state->in;
68 }
69
nft_out(const struct nft_pktinfo * pkt)70 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
71 {
72 return pkt->state->out;
73 }
74
nft_set_pktinfo(struct nft_pktinfo * pkt,struct sk_buff * skb,const struct nf_hook_state * state)75 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
76 struct sk_buff *skb,
77 const struct nf_hook_state *state)
78 {
79 pkt->skb = skb;
80 pkt->state = state;
81 }
82
nft_set_pktinfo_unspec(struct nft_pktinfo * pkt)83 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt)
84 {
85 pkt->flags = 0;
86 pkt->tprot = 0;
87 pkt->thoff = 0;
88 pkt->fragoff = 0;
89 }
90
91 /**
92 * struct nft_verdict - nf_tables verdict
93 *
94 * @code: nf_tables/netfilter verdict code
95 * @chain: destination chain for NFT_JUMP/NFT_GOTO
96 */
97 struct nft_verdict {
98 u32 code;
99 struct nft_chain *chain;
100 };
101
102 struct nft_data {
103 union {
104 u32 data[4];
105 struct nft_verdict verdict;
106 };
107 } __attribute__((aligned(__alignof__(u64))));
108
109 #define NFT_REG32_NUM 20
110
111 /**
112 * struct nft_regs - nf_tables register set
113 *
114 * @data: data registers
115 * @verdict: verdict register
116 *
117 * The first four data registers alias to the verdict register.
118 */
119 struct nft_regs {
120 union {
121 u32 data[NFT_REG32_NUM];
122 struct nft_verdict verdict;
123 };
124 };
125
126 struct nft_regs_track {
127 struct {
128 const struct nft_expr *selector;
129 const struct nft_expr *bitwise;
130 u8 num_reg;
131 } regs[NFT_REG32_NUM];
132
133 const struct nft_expr *cur;
134 const struct nft_expr *last;
135 };
136
137 /* Store/load an u8, u16 or u64 integer to/from the u32 data register.
138 *
139 * Note, when using concatenations, register allocation happens at 32-bit
140 * level. So for store instruction, pad the rest part with zero to avoid
141 * garbage values.
142 */
143
nft_reg_store8(u32 * dreg,u8 val)144 static inline void nft_reg_store8(u32 *dreg, u8 val)
145 {
146 *dreg = 0;
147 *(u8 *)dreg = val;
148 }
149
nft_reg_load8(const u32 * sreg)150 static inline u8 nft_reg_load8(const u32 *sreg)
151 {
152 return *(u8 *)sreg;
153 }
154
nft_reg_store16(u32 * dreg,u16 val)155 static inline void nft_reg_store16(u32 *dreg, u16 val)
156 {
157 *dreg = 0;
158 *(u16 *)dreg = val;
159 }
160
nft_reg_store_be16(u32 * dreg,__be16 val)161 static inline void nft_reg_store_be16(u32 *dreg, __be16 val)
162 {
163 nft_reg_store16(dreg, (__force __u16)val);
164 }
165
nft_reg_load16(const u32 * sreg)166 static inline u16 nft_reg_load16(const u32 *sreg)
167 {
168 return *(u16 *)sreg;
169 }
170
nft_reg_load_be16(const u32 * sreg)171 static inline __be16 nft_reg_load_be16(const u32 *sreg)
172 {
173 return (__force __be16)nft_reg_load16(sreg);
174 }
175
nft_reg_load_be32(const u32 * sreg)176 static inline __be32 nft_reg_load_be32(const u32 *sreg)
177 {
178 return *(__force __be32 *)sreg;
179 }
180
nft_reg_store64(u64 * dreg,u64 val)181 static inline void nft_reg_store64(u64 *dreg, u64 val)
182 {
183 put_unaligned(val, dreg);
184 }
185
nft_reg_load64(const u32 * sreg)186 static inline u64 nft_reg_load64(const u32 *sreg)
187 {
188 return get_unaligned((u64 *)sreg);
189 }
190
nft_data_copy(u32 * dst,const struct nft_data * src,unsigned int len)191 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
192 unsigned int len)
193 {
194 if (len % NFT_REG32_SIZE)
195 dst[len / NFT_REG32_SIZE] = 0;
196 memcpy(dst, src, len);
197 }
198
199 /**
200 * struct nft_ctx - nf_tables rule/set context
201 *
202 * @net: net namespace
203 * @table: the table the chain is contained in
204 * @chain: the chain the rule is contained in
205 * @nla: netlink attributes
206 * @portid: netlink portID of the original message
207 * @seq: netlink sequence number
208 * @flags: modifiers to new request
209 * @family: protocol family
210 * @level: depth of the chains
211 * @report: notify via unicast netlink message
212 * @reg_inited: bitmap of initialised registers
213 */
214 struct nft_ctx {
215 struct net *net;
216 struct nft_table *table;
217 struct nft_chain *chain;
218 const struct nlattr * const *nla;
219 u32 portid;
220 u32 seq;
221 u16 flags;
222 u8 family;
223 u8 level;
224 bool report;
225 DECLARE_BITMAP(reg_inited, NFT_REG32_NUM);
226 };
227
228 enum nft_data_desc_flags {
229 NFT_DATA_DESC_SETELEM = (1 << 0),
230 };
231
232 struct nft_data_desc {
233 enum nft_data_types type;
234 unsigned int size;
235 unsigned int len;
236 unsigned int flags;
237 };
238
239 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
240 struct nft_data_desc *desc, const struct nlattr *nla);
241 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
242 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
243 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
244 enum nft_data_types type, unsigned int len);
245
nft_dreg_to_type(enum nft_registers reg)246 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
247 {
248 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
249 }
250
nft_type_to_reg(enum nft_data_types type)251 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
252 {
253 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
254 }
255
256 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
257 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
258
259 int nft_parse_register_load(const struct nft_ctx *ctx,
260 const struct nlattr *attr, u8 *sreg, u32 len);
261 int nft_parse_register_store(const struct nft_ctx *ctx,
262 const struct nlattr *attr, u8 *dreg,
263 const struct nft_data *data,
264 enum nft_data_types type, unsigned int len);
265
266 /**
267 * struct nft_userdata - user defined data associated with an object
268 *
269 * @len: length of the data
270 * @data: content
271 *
272 * The presence of user data is indicated in an object specific fashion,
273 * so a length of zero can't occur and the value "len" indicates data
274 * of length len + 1.
275 */
276 struct nft_userdata {
277 u8 len;
278 unsigned char data[];
279 };
280
281 /* placeholder structure for opaque set element backend representation. */
282 struct nft_elem_priv { };
283
284 /**
285 * struct nft_set_elem - generic representation of set elements
286 *
287 * @key: element key
288 * @key_end: closing element key
289 * @data: element data
290 * @priv: element private data and extensions
291 */
292 struct nft_set_elem {
293 union {
294 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
295 struct nft_data val;
296 } key;
297 union {
298 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
299 struct nft_data val;
300 } key_end;
301 union {
302 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
303 struct nft_data val;
304 } data;
305 struct nft_elem_priv *priv;
306 };
307
nft_elem_priv_cast(const struct nft_elem_priv * priv)308 static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
309 {
310 return (void *)priv;
311 }
312
313
314 /**
315 * enum nft_iter_type - nftables set iterator type
316 *
317 * @NFT_ITER_UNSPEC: unspecified, to catch errors
318 * @NFT_ITER_READ: read-only iteration over set elements
319 * @NFT_ITER_UPDATE: iteration under mutex to update set element state
320 */
321 enum nft_iter_type {
322 NFT_ITER_UNSPEC,
323 NFT_ITER_READ,
324 NFT_ITER_UPDATE,
325 };
326
327 struct nft_set;
328 struct nft_set_iter {
329 u8 genmask;
330 enum nft_iter_type type:8;
331 unsigned int count;
332 unsigned int skip;
333 int err;
334 int (*fn)(const struct nft_ctx *ctx,
335 struct nft_set *set,
336 const struct nft_set_iter *iter,
337 struct nft_elem_priv *elem_priv);
338 };
339
340 /**
341 * struct nft_set_desc - description of set elements
342 *
343 * @ktype: key type
344 * @klen: key length
345 * @dtype: data type
346 * @dlen: data length
347 * @objtype: object type
348 * @size: number of set elements
349 * @policy: set policy
350 * @gc_int: garbage collector interval
351 * @timeout: element timeout
352 * @field_len: length of each field in concatenation, bytes
353 * @field_count: number of concatenated fields in element
354 * @expr: set must support for expressions
355 */
356 struct nft_set_desc {
357 u32 ktype;
358 unsigned int klen;
359 u32 dtype;
360 unsigned int dlen;
361 u32 objtype;
362 unsigned int size;
363 u32 policy;
364 u32 gc_int;
365 u64 timeout;
366 u8 field_len[NFT_REG32_COUNT];
367 u8 field_count;
368 bool expr;
369 };
370
371 /**
372 * enum nft_set_class - performance class
373 *
374 * @NFT_SET_CLASS_O_1: constant, O(1)
375 * @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N)
376 * @NFT_SET_CLASS_O_N: linear, O(N)
377 */
378 enum nft_set_class {
379 NFT_SET_CLASS_O_1,
380 NFT_SET_CLASS_O_LOG_N,
381 NFT_SET_CLASS_O_N,
382 };
383
384 /**
385 * struct nft_set_estimate - estimation of memory and performance
386 * characteristics
387 *
388 * @size: required memory
389 * @lookup: lookup performance class
390 * @space: memory class
391 */
392 struct nft_set_estimate {
393 u64 size;
394 enum nft_set_class lookup;
395 enum nft_set_class space;
396 };
397
398 #define NFT_EXPR_MAXATTR 16
399 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
400 ALIGN(size, __alignof__(struct nft_expr)))
401
402 /**
403 * struct nft_expr - nf_tables expression
404 *
405 * @ops: expression ops
406 * @data: expression private data
407 */
408 struct nft_expr {
409 const struct nft_expr_ops *ops;
410 unsigned char data[]
411 __attribute__((aligned(__alignof__(u64))));
412 };
413
nft_expr_priv(const struct nft_expr * expr)414 static inline void *nft_expr_priv(const struct nft_expr *expr)
415 {
416 return (void *)expr->data;
417 }
418
419 struct nft_expr_info;
420
421 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
422 struct nft_expr_info *info);
423 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
424 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
425 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
426 const struct nft_expr *expr, bool reset);
427 bool nft_expr_reduce_bitwise(struct nft_regs_track *track,
428 const struct nft_expr *expr);
429
430 struct nft_set_ext;
431
432 /**
433 * struct nft_set_ops - nf_tables set operations
434 *
435 * @lookup: look up an element within the set
436 * @update: update an element if exists, add it if doesn't exist
437 * @delete: delete an element
438 * @insert: insert new element into set
439 * @activate: activate new element in the next generation
440 * @deactivate: lookup for element and deactivate it in the next generation
441 * @flush: deactivate element in the next generation
442 * @remove: remove element from set
443 * @walk: iterate over all set elements
444 * @get: get set elements
445 * @ksize: kernel set size
446 * @usize: userspace set size
447 * @adjust_maxsize: delta to adjust maximum set size
448 * @commit: commit set elements
449 * @abort: abort set elements
450 * @privsize: function to return size of set private data
451 * @estimate: estimate the required memory size and the lookup complexity class
452 * @init: initialize private data of new set instance
453 * @destroy: destroy private data of set instance
454 * @gc_init: initialize garbage collection
455 * @elemsize: element private size
456 *
457 * Operations lookup, update and delete have simpler interfaces, are faster
458 * and currently only used in the packet path. All the rest are slower,
459 * control plane functions.
460 */
461 struct nft_set_ops {
462 bool (*lookup)(const struct net *net,
463 const struct nft_set *set,
464 const u32 *key,
465 const struct nft_set_ext **ext);
466 bool (*update)(struct nft_set *set,
467 const u32 *key,
468 struct nft_elem_priv *
469 (*new)(struct nft_set *,
470 const struct nft_expr *,
471 struct nft_regs *),
472 const struct nft_expr *expr,
473 struct nft_regs *regs,
474 const struct nft_set_ext **ext);
475 bool (*delete)(const struct nft_set *set,
476 const u32 *key);
477
478 int (*insert)(const struct net *net,
479 const struct nft_set *set,
480 const struct nft_set_elem *elem,
481 struct nft_elem_priv **priv);
482 void (*activate)(const struct net *net,
483 const struct nft_set *set,
484 struct nft_elem_priv *elem_priv);
485 struct nft_elem_priv * (*deactivate)(const struct net *net,
486 const struct nft_set *set,
487 const struct nft_set_elem *elem);
488 void (*flush)(const struct net *net,
489 const struct nft_set *set,
490 struct nft_elem_priv *priv);
491 void (*remove)(const struct net *net,
492 const struct nft_set *set,
493 struct nft_elem_priv *elem_priv);
494 void (*walk)(const struct nft_ctx *ctx,
495 struct nft_set *set,
496 struct nft_set_iter *iter);
497 struct nft_elem_priv * (*get)(const struct net *net,
498 const struct nft_set *set,
499 const struct nft_set_elem *elem,
500 unsigned int flags);
501 u32 (*ksize)(u32 size);
502 u32 (*usize)(u32 size);
503 u32 (*adjust_maxsize)(const struct nft_set *set);
504 void (*commit)(struct nft_set *set);
505 void (*abort)(const struct nft_set *set);
506 u64 (*privsize)(const struct nlattr * const nla[],
507 const struct nft_set_desc *desc);
508 bool (*estimate)(const struct nft_set_desc *desc,
509 u32 features,
510 struct nft_set_estimate *est);
511 int (*init)(const struct nft_set *set,
512 const struct nft_set_desc *desc,
513 const struct nlattr * const nla[]);
514 void (*destroy)(const struct nft_ctx *ctx,
515 const struct nft_set *set);
516 void (*gc_init)(const struct nft_set *set);
517
518 unsigned int elemsize;
519 };
520
521 /**
522 * struct nft_set_type - nf_tables set type
523 *
524 * @ops: set ops for this type
525 * @features: features supported by the implementation
526 */
527 struct nft_set_type {
528 const struct nft_set_ops ops;
529 u32 features;
530 };
531 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
532
533 struct nft_set_elem_expr {
534 u8 size;
535 unsigned char data[]
536 __attribute__((aligned(__alignof__(struct nft_expr))));
537 };
538
539 #define nft_setelem_expr_at(__elem_expr, __offset) \
540 ((struct nft_expr *)&__elem_expr->data[__offset])
541
542 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
543 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
544 __size < (__elem_expr)->size; \
545 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
546
547 #define NFT_SET_EXPR_MAX 2
548
549 /**
550 * struct nft_set - nf_tables set instance
551 *
552 * @list: table set list node
553 * @bindings: list of set bindings
554 * @refs: internal refcounting for async set destruction
555 * @table: table this set belongs to
556 * @net: netnamespace this set belongs to
557 * @name: name of the set
558 * @handle: unique handle of the set
559 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
560 * @dtype: data type (verdict or numeric type defined by userspace)
561 * @objtype: object type (see NFT_OBJECT_* definitions)
562 * @size: maximum set size
563 * @field_len: length of each field in concatenation, bytes
564 * @field_count: number of concatenated fields in element
565 * @use: number of rules references to this set
566 * @nelems: number of elements
567 * @ndeact: number of deactivated elements queued for removal
568 * @timeout: default timeout value in jiffies
569 * @gc_int: garbage collection interval in msecs
570 * @policy: set parameterization (see enum nft_set_policies)
571 * @udlen: user data length
572 * @udata: user data
573 * @pending_update: list of pending update set element
574 * @ops: set ops
575 * @flags: set flags
576 * @dead: set will be freed, never cleared
577 * @genmask: generation mask
578 * @klen: key length
579 * @dlen: data length
580 * @num_exprs: numbers of exprs
581 * @exprs: stateful expression
582 * @catchall_list: list of catch-all set element
583 * @data: private set data
584 */
585 struct nft_set {
586 struct list_head list;
587 struct list_head bindings;
588 refcount_t refs;
589 struct nft_table *table;
590 possible_net_t net;
591 char *name;
592 u64 handle;
593 u32 ktype;
594 u32 dtype;
595 u32 objtype;
596 u32 size;
597 u8 field_len[NFT_REG32_COUNT];
598 u8 field_count;
599 u32 use;
600 atomic_t nelems;
601 u32 ndeact;
602 u64 timeout;
603 u32 gc_int;
604 u16 policy;
605 u16 udlen;
606 unsigned char *udata;
607 struct list_head pending_update;
608 /* runtime data below here */
609 const struct nft_set_ops *ops ____cacheline_aligned;
610 u16 flags:13,
611 dead:1,
612 genmask:2;
613 u8 klen;
614 u8 dlen;
615 u8 num_exprs;
616 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
617 struct list_head catchall_list;
618 unsigned char data[]
619 __attribute__((aligned(__alignof__(u64))));
620 };
621
nft_set_is_anonymous(const struct nft_set * set)622 static inline bool nft_set_is_anonymous(const struct nft_set *set)
623 {
624 return set->flags & NFT_SET_ANONYMOUS;
625 }
626
nft_set_priv(const struct nft_set * set)627 static inline void *nft_set_priv(const struct nft_set *set)
628 {
629 return (void *)set->data;
630 }
631
nft_set_datatype(const struct nft_set * set)632 static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
633 {
634 return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
635 }
636
nft_set_gc_is_pending(const struct nft_set * s)637 static inline bool nft_set_gc_is_pending(const struct nft_set *s)
638 {
639 return refcount_read(&s->refs) != 1;
640 }
641
nft_set_container_of(const void * priv)642 static inline struct nft_set *nft_set_container_of(const void *priv)
643 {
644 return (void *)priv - offsetof(struct nft_set, data);
645 }
646
647 struct nft_set *nft_set_lookup_global(const struct net *net,
648 const struct nft_table *table,
649 const struct nlattr *nla_set_name,
650 const struct nlattr *nla_set_id,
651 u8 genmask);
652
653 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
654 const struct nft_set *set);
655
nft_set_gc_interval(const struct nft_set * set)656 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
657 {
658 u32 gc_int = READ_ONCE(set->gc_int);
659
660 return gc_int ? msecs_to_jiffies(gc_int) : HZ;
661 }
662
663 /**
664 * struct nft_set_binding - nf_tables set binding
665 *
666 * @list: set bindings list node
667 * @chain: chain containing the rule bound to the set
668 * @flags: set action flags
669 *
670 * A set binding contains all information necessary for validation
671 * of new elements added to a bound set.
672 */
673 struct nft_set_binding {
674 struct list_head list;
675 const struct nft_chain *chain;
676 u32 flags;
677 };
678
679 enum nft_trans_phase;
680 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
681 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
682 struct nft_set_binding *binding,
683 enum nft_trans_phase phase);
684 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
685 struct nft_set_binding *binding);
686 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
687
688 /**
689 * enum nft_set_extensions - set extension type IDs
690 *
691 * @NFT_SET_EXT_KEY: element key
692 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
693 * @NFT_SET_EXT_DATA: mapping data
694 * @NFT_SET_EXT_FLAGS: element flags
695 * @NFT_SET_EXT_TIMEOUT: element timeout
696 * @NFT_SET_EXT_USERDATA: user data associated with the element
697 * @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
698 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
699 * @NFT_SET_EXT_NUM: number of extension types
700 */
701 enum nft_set_extensions {
702 NFT_SET_EXT_KEY,
703 NFT_SET_EXT_KEY_END,
704 NFT_SET_EXT_DATA,
705 NFT_SET_EXT_FLAGS,
706 NFT_SET_EXT_TIMEOUT,
707 NFT_SET_EXT_USERDATA,
708 NFT_SET_EXT_EXPRESSIONS,
709 NFT_SET_EXT_OBJREF,
710 NFT_SET_EXT_NUM
711 };
712
713 /**
714 * struct nft_set_ext_type - set extension type
715 *
716 * @len: fixed part length of the extension
717 * @align: alignment requirements of the extension
718 */
719 struct nft_set_ext_type {
720 u8 len;
721 u8 align;
722 };
723
724 extern const struct nft_set_ext_type nft_set_ext_types[];
725
726 /**
727 * struct nft_set_ext_tmpl - set extension template
728 *
729 * @len: length of extension area
730 * @offset: offsets of individual extension types
731 * @ext_len: length of the expected extension(used to sanity check)
732 */
733 struct nft_set_ext_tmpl {
734 u16 len;
735 u8 offset[NFT_SET_EXT_NUM];
736 u8 ext_len[NFT_SET_EXT_NUM];
737 };
738
739 /**
740 * struct nft_set_ext - set extensions
741 *
742 * @genmask: generation mask, but also flags (see NFT_SET_ELEM_DEAD_BIT)
743 * @offset: offsets of individual extension types
744 * @data: beginning of extension data
745 *
746 * This structure must be aligned to word size, otherwise atomic bitops
747 * on genmask field can cause alignment failure on some archs.
748 */
749 struct nft_set_ext {
750 u8 genmask;
751 u8 offset[NFT_SET_EXT_NUM];
752 char data[];
753 } __aligned(BITS_PER_LONG / 8);
754
nft_set_ext_prepare(struct nft_set_ext_tmpl * tmpl)755 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
756 {
757 memset(tmpl, 0, sizeof(*tmpl));
758 tmpl->len = sizeof(struct nft_set_ext);
759 }
760
nft_set_ext_add_length(struct nft_set_ext_tmpl * tmpl,u8 id,unsigned int len)761 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
762 unsigned int len)
763 {
764 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
765 if (tmpl->len > U8_MAX)
766 return -EINVAL;
767
768 tmpl->offset[id] = tmpl->len;
769 tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
770 tmpl->len += tmpl->ext_len[id];
771
772 return 0;
773 }
774
nft_set_ext_add(struct nft_set_ext_tmpl * tmpl,u8 id)775 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
776 {
777 return nft_set_ext_add_length(tmpl, id, 0);
778 }
779
nft_set_ext_init(struct nft_set_ext * ext,const struct nft_set_ext_tmpl * tmpl)780 static inline void nft_set_ext_init(struct nft_set_ext *ext,
781 const struct nft_set_ext_tmpl *tmpl)
782 {
783 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
784 }
785
__nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)786 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
787 {
788 return !!ext->offset[id];
789 }
790
nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)791 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
792 {
793 return ext && __nft_set_ext_exists(ext, id);
794 }
795
nft_set_ext(const struct nft_set_ext * ext,u8 id)796 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
797 {
798 return (void *)ext + ext->offset[id];
799 }
800
nft_set_ext_key(const struct nft_set_ext * ext)801 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
802 {
803 return nft_set_ext(ext, NFT_SET_EXT_KEY);
804 }
805
nft_set_ext_key_end(const struct nft_set_ext * ext)806 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
807 {
808 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
809 }
810
nft_set_ext_data(const struct nft_set_ext * ext)811 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
812 {
813 return nft_set_ext(ext, NFT_SET_EXT_DATA);
814 }
815
nft_set_ext_flags(const struct nft_set_ext * ext)816 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
817 {
818 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
819 }
820
821 struct nft_timeout {
822 u64 timeout;
823 u64 expiration;
824 };
825
nft_set_ext_timeout(const struct nft_set_ext * ext)826 static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
827 {
828 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
829 }
830
nft_set_ext_userdata(const struct nft_set_ext * ext)831 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
832 {
833 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
834 }
835
nft_set_ext_expr(const struct nft_set_ext * ext)836 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
837 {
838 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
839 }
840
__nft_set_elem_expired(const struct nft_set_ext * ext,u64 tstamp)841 static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
842 u64 tstamp)
843 {
844 if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
845 READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
846 return false;
847
848 return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
849 }
850
nft_set_elem_expired(const struct nft_set_ext * ext)851 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
852 {
853 return __nft_set_elem_expired(ext, get_jiffies_64());
854 }
855
nft_set_elem_ext(const struct nft_set * set,const struct nft_elem_priv * elem_priv)856 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
857 const struct nft_elem_priv *elem_priv)
858 {
859 return (void *)elem_priv + set->ops->elemsize;
860 }
861
nft_set_ext_obj(const struct nft_set_ext * ext)862 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
863 {
864 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
865 }
866
867 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
868 const struct nft_set *set,
869 const struct nlattr *attr);
870
871 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
872 const struct nft_set_ext_tmpl *tmpl,
873 const u32 *key, const u32 *key_end,
874 const u32 *data,
875 u64 timeout, u64 expiration, gfp_t gfp);
876 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
877 struct nft_expr *expr_array[]);
878 void nft_set_elem_destroy(const struct nft_set *set,
879 const struct nft_elem_priv *elem_priv,
880 bool destroy_expr);
881 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
882 const struct nft_set *set,
883 const struct nft_elem_priv *elem_priv);
884
885 struct nft_expr_ops;
886 /**
887 * struct nft_expr_type - nf_tables expression type
888 *
889 * @select_ops: function to select nft_expr_ops
890 * @release_ops: release nft_expr_ops
891 * @ops: default ops, used when no select_ops functions is present
892 * @inner_ops: inner ops, used for inner packet operation
893 * @list: used internally
894 * @name: Identifier
895 * @owner: module reference
896 * @policy: netlink attribute policy
897 * @maxattr: highest netlink attribute number
898 * @family: address family for AF-specific types
899 * @flags: expression type flags
900 */
901 struct nft_expr_type {
902 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
903 const struct nlattr * const tb[]);
904 void (*release_ops)(const struct nft_expr_ops *ops);
905 const struct nft_expr_ops *ops;
906 const struct nft_expr_ops *inner_ops;
907 struct list_head list;
908 const char *name;
909 struct module *owner;
910 const struct nla_policy *policy;
911 unsigned int maxattr;
912 u8 family;
913 u8 flags;
914 };
915
916 #define NFT_EXPR_STATEFUL 0x1
917 #define NFT_EXPR_GC 0x2
918
919 enum nft_trans_phase {
920 NFT_TRANS_PREPARE,
921 NFT_TRANS_PREPARE_ERROR,
922 NFT_TRANS_ABORT,
923 NFT_TRANS_COMMIT,
924 NFT_TRANS_RELEASE
925 };
926
927 struct nft_flow_rule;
928 struct nft_offload_ctx;
929
930 /**
931 * struct nft_expr_ops - nf_tables expression operations
932 *
933 * @eval: Expression evaluation function
934 * @clone: Expression clone function
935 * @size: full expression size, including private data size
936 * @init: initialization function
937 * @activate: activate expression in the next generation
938 * @deactivate: deactivate expression in next generation
939 * @destroy: destruction function, called after synchronize_rcu
940 * @destroy_clone: destruction clone function
941 * @dump: function to dump parameters
942 * @validate: validate expression, called during loop detection
943 * @reduce: reduce expression
944 * @gc: garbage collection expression
945 * @offload: hardware offload expression
946 * @offload_action: function to report true/false to allocate one slot or not in the flow
947 * offload array
948 * @offload_stats: function to synchronize hardware stats via updating the counter expression
949 * @type: expression type
950 * @data: extra data to attach to this expression operation
951 */
952 struct nft_expr_ops {
953 void (*eval)(const struct nft_expr *expr,
954 struct nft_regs *regs,
955 const struct nft_pktinfo *pkt);
956 int (*clone)(struct nft_expr *dst,
957 const struct nft_expr *src, gfp_t gfp);
958 unsigned int size;
959
960 int (*init)(const struct nft_ctx *ctx,
961 const struct nft_expr *expr,
962 const struct nlattr * const tb[]);
963 void (*activate)(const struct nft_ctx *ctx,
964 const struct nft_expr *expr);
965 void (*deactivate)(const struct nft_ctx *ctx,
966 const struct nft_expr *expr,
967 enum nft_trans_phase phase);
968 void (*destroy)(const struct nft_ctx *ctx,
969 const struct nft_expr *expr);
970 void (*destroy_clone)(const struct nft_ctx *ctx,
971 const struct nft_expr *expr);
972 int (*dump)(struct sk_buff *skb,
973 const struct nft_expr *expr,
974 bool reset);
975 int (*validate)(const struct nft_ctx *ctx,
976 const struct nft_expr *expr);
977 bool (*reduce)(struct nft_regs_track *track,
978 const struct nft_expr *expr);
979 bool (*gc)(struct net *net,
980 const struct nft_expr *expr);
981 int (*offload)(struct nft_offload_ctx *ctx,
982 struct nft_flow_rule *flow,
983 const struct nft_expr *expr);
984 bool (*offload_action)(const struct nft_expr *expr);
985 void (*offload_stats)(struct nft_expr *expr,
986 const struct flow_stats *stats);
987 const struct nft_expr_type *type;
988 void *data;
989 };
990
991 /**
992 * struct nft_rule - nf_tables rule
993 *
994 * @list: used internally
995 * @handle: rule handle
996 * @genmask: generation mask
997 * @dlen: length of expression data
998 * @udata: user data is appended to the rule
999 * @data: expression data
1000 */
1001 struct nft_rule {
1002 struct list_head list;
1003 u64 handle:42,
1004 genmask:2,
1005 dlen:12,
1006 udata:1;
1007 unsigned char data[]
1008 __attribute__((aligned(__alignof__(struct nft_expr))));
1009 };
1010
nft_expr_first(const struct nft_rule * rule)1011 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
1012 {
1013 return (struct nft_expr *)&rule->data[0];
1014 }
1015
nft_expr_next(const struct nft_expr * expr)1016 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
1017 {
1018 return ((void *)expr) + expr->ops->size;
1019 }
1020
nft_expr_last(const struct nft_rule * rule)1021 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
1022 {
1023 return (struct nft_expr *)&rule->data[rule->dlen];
1024 }
1025
nft_expr_more(const struct nft_rule * rule,const struct nft_expr * expr)1026 static inline bool nft_expr_more(const struct nft_rule *rule,
1027 const struct nft_expr *expr)
1028 {
1029 return expr != nft_expr_last(rule) && expr->ops;
1030 }
1031
nft_userdata(const struct nft_rule * rule)1032 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
1033 {
1034 return (void *)&rule->data[rule->dlen];
1035 }
1036
1037 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
1038 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
1039 enum nft_trans_phase phase);
1040 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
1041
nft_set_elem_update_expr(const struct nft_set_ext * ext,struct nft_regs * regs,const struct nft_pktinfo * pkt)1042 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
1043 struct nft_regs *regs,
1044 const struct nft_pktinfo *pkt)
1045 {
1046 struct nft_set_elem_expr *elem_expr;
1047 struct nft_expr *expr;
1048 u32 size;
1049
1050 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
1051 elem_expr = nft_set_ext_expr(ext);
1052 nft_setelem_expr_foreach(expr, elem_expr, size) {
1053 expr->ops->eval(expr, regs, pkt);
1054 if (regs->verdict.code == NFT_BREAK)
1055 return;
1056 }
1057 }
1058 }
1059
1060 /*
1061 * The last pointer isn't really necessary, but the compiler isn't able to
1062 * determine that the result of nft_expr_last() is always the same since it
1063 * can't assume that the dlen value wasn't changed within calls in the loop.
1064 */
1065 #define nft_rule_for_each_expr(expr, last, rule) \
1066 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
1067 (expr) != (last); \
1068 (expr) = nft_expr_next(expr))
1069
1070 #define NFT_CHAIN_POLICY_UNSET U8_MAX
1071
1072 struct nft_rule_dp {
1073 u64 is_last:1,
1074 dlen:12,
1075 handle:42; /* for tracing */
1076 unsigned char data[]
1077 __attribute__((aligned(__alignof__(struct nft_expr))));
1078 };
1079
1080 struct nft_rule_dp_last {
1081 struct nft_rule_dp end; /* end of nft_rule_blob marker */
1082 struct rcu_head h; /* call_rcu head */
1083 struct nft_rule_blob *blob; /* ptr to free via call_rcu */
1084 const struct nft_chain *chain; /* for nftables tracing */
1085 };
1086
nft_rule_next(const struct nft_rule_dp * rule)1087 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
1088 {
1089 return (void *)rule + sizeof(*rule) + rule->dlen;
1090 }
1091
1092 struct nft_rule_blob {
1093 unsigned long size;
1094 unsigned char data[]
1095 __attribute__((aligned(__alignof__(struct nft_rule_dp))));
1096 };
1097
1098 /**
1099 * struct nft_chain - nf_tables chain
1100 *
1101 * @blob_gen_0: rule blob pointer to the current generation
1102 * @blob_gen_1: rule blob pointer to the future generation
1103 * @rules: list of rules in the chain
1104 * @list: used internally
1105 * @rhlhead: used internally
1106 * @table: table that this chain belongs to
1107 * @handle: chain handle
1108 * @use: number of jump references to this chain
1109 * @flags: bitmask of enum NFTA_CHAIN_FLAGS
1110 * @bound: bind or not
1111 * @genmask: generation mask
1112 * @name: name of the chain
1113 * @udlen: user data length
1114 * @udata: user data in the chain
1115 * @blob_next: rule blob pointer to the next in the chain
1116 */
1117 struct nft_chain {
1118 struct nft_rule_blob __rcu *blob_gen_0;
1119 struct nft_rule_blob __rcu *blob_gen_1;
1120 struct list_head rules;
1121 struct list_head list;
1122 struct rhlist_head rhlhead;
1123 struct nft_table *table;
1124 u64 handle;
1125 u32 use;
1126 u8 flags:5,
1127 bound:1,
1128 genmask:2;
1129 char *name;
1130 u16 udlen;
1131 u8 *udata;
1132
1133 /* Only used during control plane commit phase: */
1134 struct nft_rule_blob *blob_next;
1135 };
1136
1137 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
1138 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
1139 const struct nft_set_iter *iter,
1140 struct nft_elem_priv *elem_priv);
1141 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
1142 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1143 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1144
1145 enum nft_chain_types {
1146 NFT_CHAIN_T_DEFAULT = 0,
1147 NFT_CHAIN_T_ROUTE,
1148 NFT_CHAIN_T_NAT,
1149 NFT_CHAIN_T_MAX
1150 };
1151
1152 /**
1153 * struct nft_chain_type - nf_tables chain type info
1154 *
1155 * @name: name of the type
1156 * @type: numeric identifier
1157 * @family: address family
1158 * @owner: module owner
1159 * @hook_mask: mask of valid hooks
1160 * @hooks: array of hook functions
1161 * @ops_register: base chain register function
1162 * @ops_unregister: base chain unregister function
1163 */
1164 struct nft_chain_type {
1165 const char *name;
1166 enum nft_chain_types type;
1167 int family;
1168 struct module *owner;
1169 unsigned int hook_mask;
1170 nf_hookfn *hooks[NFT_MAX_HOOKS];
1171 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1172 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1173 };
1174
1175 int nft_chain_validate_dependency(const struct nft_chain *chain,
1176 enum nft_chain_types type);
1177 int nft_chain_validate_hooks(const struct nft_chain *chain,
1178 unsigned int hook_flags);
1179
nft_chain_binding(const struct nft_chain * chain)1180 static inline bool nft_chain_binding(const struct nft_chain *chain)
1181 {
1182 return chain->flags & NFT_CHAIN_BINDING;
1183 }
1184
nft_chain_is_bound(struct nft_chain * chain)1185 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1186 {
1187 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1188 }
1189
1190 int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
1191 void nft_chain_del(struct nft_chain *chain);
1192 void nf_tables_chain_destroy(struct nft_chain *chain);
1193
1194 struct nft_stats {
1195 u64 bytes;
1196 u64 pkts;
1197 struct u64_stats_sync syncp;
1198 };
1199
1200 struct nft_hook {
1201 struct list_head list;
1202 struct nf_hook_ops ops;
1203 struct rcu_head rcu;
1204 char ifname[IFNAMSIZ];
1205 u8 ifnamelen;
1206 };
1207
1208 /**
1209 * struct nft_base_chain - nf_tables base chain
1210 *
1211 * @ops: netfilter hook ops
1212 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1213 * @type: chain type
1214 * @policy: default policy
1215 * @flags: indicate the base chain disabled or not
1216 * @stats: per-cpu chain stats
1217 * @chain: the chain
1218 * @flow_block: flow block (for hardware offload)
1219 */
1220 struct nft_base_chain {
1221 struct nf_hook_ops ops;
1222 struct list_head hook_list;
1223 const struct nft_chain_type *type;
1224 u8 policy;
1225 u8 flags;
1226 struct nft_stats __percpu *stats;
1227 struct nft_chain chain;
1228 struct flow_block flow_block;
1229 };
1230
nft_base_chain(const struct nft_chain * chain)1231 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1232 {
1233 return container_of(chain, struct nft_base_chain, chain);
1234 }
1235
nft_is_base_chain(const struct nft_chain * chain)1236 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1237 {
1238 return chain->flags & NFT_CHAIN_BASE;
1239 }
1240
1241 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1242
nft_use_inc(u32 * use)1243 static inline bool nft_use_inc(u32 *use)
1244 {
1245 if (*use == UINT_MAX)
1246 return false;
1247
1248 (*use)++;
1249
1250 return true;
1251 }
1252
nft_use_dec(u32 * use)1253 static inline void nft_use_dec(u32 *use)
1254 {
1255 WARN_ON_ONCE((*use)-- == 0);
1256 }
1257
1258 /* For error and abort path: restore use counter to previous state. */
nft_use_inc_restore(u32 * use)1259 static inline void nft_use_inc_restore(u32 *use)
1260 {
1261 WARN_ON_ONCE(!nft_use_inc(use));
1262 }
1263
1264 #define nft_use_dec_restore nft_use_dec
1265
1266 /**
1267 * struct nft_table - nf_tables table
1268 *
1269 * @list: used internally
1270 * @chains_ht: chains in the table
1271 * @chains: same, for stable walks
1272 * @sets: sets in the table
1273 * @objects: stateful objects in the table
1274 * @flowtables: flow tables in the table
1275 * @hgenerator: handle generator state
1276 * @handle: table handle
1277 * @use: number of chain references to this table
1278 * @family:address family
1279 * @flags: table flag (see enum nft_table_flags)
1280 * @genmask: generation mask
1281 * @nlpid: netlink port ID
1282 * @name: name of the table
1283 * @udlen: length of the user data
1284 * @udata: user data
1285 * @validate_state: internal, set when transaction adds jumps
1286 */
1287 struct nft_table {
1288 struct list_head list;
1289 struct rhltable chains_ht;
1290 struct list_head chains;
1291 struct list_head sets;
1292 struct list_head objects;
1293 struct list_head flowtables;
1294 u64 hgenerator;
1295 u64 handle;
1296 u32 use;
1297 u16 family:6,
1298 flags:8,
1299 genmask:2;
1300 u32 nlpid;
1301 char *name;
1302 u16 udlen;
1303 u8 *udata;
1304 u8 validate_state;
1305 };
1306
nft_table_has_owner(const struct nft_table * table)1307 static inline bool nft_table_has_owner(const struct nft_table *table)
1308 {
1309 return table->flags & NFT_TABLE_F_OWNER;
1310 }
1311
nft_table_is_orphan(const struct nft_table * table)1312 static inline bool nft_table_is_orphan(const struct nft_table *table)
1313 {
1314 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
1315 NFT_TABLE_F_PERSIST;
1316 }
1317
nft_base_chain_netdev(int family,u32 hooknum)1318 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1319 {
1320 return family == NFPROTO_NETDEV ||
1321 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1322 }
1323
1324 void nft_register_chain_type(const struct nft_chain_type *);
1325 void nft_unregister_chain_type(const struct nft_chain_type *);
1326
1327 int nft_register_expr(struct nft_expr_type *);
1328 void nft_unregister_expr(struct nft_expr_type *);
1329
1330 int nft_verdict_dump(struct sk_buff *skb, int type,
1331 const struct nft_verdict *v);
1332
1333 /**
1334 * struct nft_object_hash_key - key to lookup nft_object
1335 *
1336 * @name: name of the stateful object to look up
1337 * @table: table the object belongs to
1338 */
1339 struct nft_object_hash_key {
1340 const char *name;
1341 const struct nft_table *table;
1342 };
1343
1344 /**
1345 * struct nft_object - nf_tables stateful object
1346 *
1347 * @list: table stateful object list node
1348 * @rhlhead: nft_objname_ht node
1349 * @key: keys that identify this object
1350 * @genmask: generation mask
1351 * @use: number of references to this stateful object
1352 * @handle: unique object handle
1353 * @udlen: length of user data
1354 * @udata: user data
1355 * @ops: object operations
1356 * @data: object data, layout depends on type
1357 */
1358 struct nft_object {
1359 struct list_head list;
1360 struct rhlist_head rhlhead;
1361 struct nft_object_hash_key key;
1362 u32 genmask:2;
1363 u32 use;
1364 u64 handle;
1365 u16 udlen;
1366 u8 *udata;
1367 /* runtime data below here */
1368 const struct nft_object_ops *ops ____cacheline_aligned;
1369 unsigned char data[]
1370 __attribute__((aligned(__alignof__(u64))));
1371 };
1372
nft_obj_data(const struct nft_object * obj)1373 static inline void *nft_obj_data(const struct nft_object *obj)
1374 {
1375 return (void *)obj->data;
1376 }
1377
1378 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1379
1380 struct nft_object *nft_obj_lookup(const struct net *net,
1381 const struct nft_table *table,
1382 const struct nlattr *nla, u32 objtype,
1383 u8 genmask);
1384
1385 void nft_obj_notify(struct net *net, const struct nft_table *table,
1386 struct nft_object *obj, u32 portid, u32 seq,
1387 int event, u16 flags, int family, int report, gfp_t gfp);
1388
1389 /**
1390 * struct nft_object_type - stateful object type
1391 *
1392 * @select_ops: function to select nft_object_ops
1393 * @ops: default ops, used when no select_ops functions is present
1394 * @list: list node in list of object types
1395 * @type: stateful object numeric type
1396 * @owner: module owner
1397 * @maxattr: maximum netlink attribute
1398 * @family: address family for AF-specific object types
1399 * @policy: netlink attribute policy
1400 */
1401 struct nft_object_type {
1402 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1403 const struct nlattr * const tb[]);
1404 const struct nft_object_ops *ops;
1405 struct list_head list;
1406 u32 type;
1407 unsigned int maxattr;
1408 u8 family;
1409 struct module *owner;
1410 const struct nla_policy *policy;
1411 };
1412
1413 /**
1414 * struct nft_object_ops - stateful object operations
1415 *
1416 * @eval: stateful object evaluation function
1417 * @size: stateful object size
1418 * @init: initialize object from netlink attributes
1419 * @destroy: release existing stateful object
1420 * @dump: netlink dump stateful object
1421 * @update: update stateful object
1422 * @type: pointer to object type
1423 */
1424 struct nft_object_ops {
1425 void (*eval)(struct nft_object *obj,
1426 struct nft_regs *regs,
1427 const struct nft_pktinfo *pkt);
1428 unsigned int size;
1429 int (*init)(const struct nft_ctx *ctx,
1430 const struct nlattr *const tb[],
1431 struct nft_object *obj);
1432 void (*destroy)(const struct nft_ctx *ctx,
1433 struct nft_object *obj);
1434 int (*dump)(struct sk_buff *skb,
1435 struct nft_object *obj,
1436 bool reset);
1437 void (*update)(struct nft_object *obj,
1438 struct nft_object *newobj);
1439 const struct nft_object_type *type;
1440 };
1441
1442 int nft_register_obj(struct nft_object_type *obj_type);
1443 void nft_unregister_obj(struct nft_object_type *obj_type);
1444
1445 #define NFT_NETDEVICE_MAX 256
1446
1447 /**
1448 * struct nft_flowtable - nf_tables flow table
1449 *
1450 * @list: flow table list node in table list
1451 * @table: the table the flow table is contained in
1452 * @name: name of this flow table
1453 * @hooknum: hook number
1454 * @ops_len: number of hooks in array
1455 * @genmask: generation mask
1456 * @use: number of references to this flow table
1457 * @handle: unique object handle
1458 * @hook_list: hook list for hooks per net_device in flowtables
1459 * @data: rhashtable and garbage collector
1460 */
1461 struct nft_flowtable {
1462 struct list_head list;
1463 struct nft_table *table;
1464 char *name;
1465 int hooknum;
1466 int ops_len;
1467 u32 genmask:2;
1468 u32 use;
1469 u64 handle;
1470 /* runtime data below here */
1471 struct list_head hook_list ____cacheline_aligned;
1472 struct nf_flowtable data;
1473 };
1474
1475 struct nft_flowtable *nft_flowtable_lookup(const struct net *net,
1476 const struct nft_table *table,
1477 const struct nlattr *nla,
1478 u8 genmask);
1479
1480 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1481 struct nft_flowtable *flowtable,
1482 enum nft_trans_phase phase);
1483
1484 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1485 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1486
1487 /**
1488 * struct nft_traceinfo - nft tracing information and state
1489 *
1490 * @trace: other struct members are initialised
1491 * @nf_trace: copy of skb->nf_trace before rule evaluation
1492 * @type: event type (enum nft_trace_types)
1493 * @skbid: hash of skb to be used as trace id
1494 * @packet_dumped: packet headers sent in a previous traceinfo message
1495 * @basechain: base chain currently processed
1496 */
1497 struct nft_traceinfo {
1498 bool trace;
1499 bool nf_trace;
1500 bool packet_dumped;
1501 enum nft_trace_types type:8;
1502 u32 skbid;
1503 const struct nft_base_chain *basechain;
1504 };
1505
1506 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1507 const struct nft_chain *basechain);
1508
1509 void nft_trace_notify(const struct nft_pktinfo *pkt,
1510 const struct nft_verdict *verdict,
1511 const struct nft_rule_dp *rule,
1512 struct nft_traceinfo *info);
1513
1514 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1515 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1516
1517 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1518 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1519
1520 #define MODULE_ALIAS_NFT_EXPR(name) \
1521 MODULE_ALIAS("nft-expr-" name)
1522
1523 #define MODULE_ALIAS_NFT_OBJ(type) \
1524 MODULE_ALIAS("nft-obj-" __stringify(type))
1525
1526 #if IS_ENABLED(CONFIG_NF_TABLES)
1527
1528 /*
1529 * The gencursor defines two generations, the currently active and the
1530 * next one. Objects contain a bitmask of 2 bits specifying the generations
1531 * they're active in. A set bit means they're inactive in the generation
1532 * represented by that bit.
1533 *
1534 * New objects start out as inactive in the current and active in the
1535 * next generation. When committing the ruleset the bitmask is cleared,
1536 * meaning they're active in all generations. When removing an object,
1537 * it is set inactive in the next generation. After committing the ruleset,
1538 * the objects are removed.
1539 */
nft_gencursor_next(const struct net * net)1540 static inline unsigned int nft_gencursor_next(const struct net *net)
1541 {
1542 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1543 }
1544
nft_genmask_next(const struct net * net)1545 static inline u8 nft_genmask_next(const struct net *net)
1546 {
1547 return 1 << nft_gencursor_next(net);
1548 }
1549
nft_genmask_cur(const struct net * net)1550 static inline u8 nft_genmask_cur(const struct net *net)
1551 {
1552 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1553 return 1 << READ_ONCE(net->nft.gencursor);
1554 }
1555
1556 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1557
1558 /*
1559 * Generic transaction helpers
1560 */
1561
1562 /* Check if this object is currently active. */
1563 #define nft_is_active(__net, __obj) \
1564 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1565
1566 /* Check if this object is active in the next generation. */
1567 #define nft_is_active_next(__net, __obj) \
1568 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1569
1570 /* This object becomes active in the next generation. */
1571 #define nft_activate_next(__net, __obj) \
1572 (__obj)->genmask = nft_genmask_cur(__net)
1573
1574 /* This object becomes inactive in the next generation. */
1575 #define nft_deactivate_next(__net, __obj) \
1576 (__obj)->genmask = nft_genmask_next(__net)
1577
1578 /* After committing the ruleset, clear the stale generation bit. */
1579 #define nft_clear(__net, __obj) \
1580 (__obj)->genmask &= ~nft_genmask_next(__net)
1581 #define nft_active_genmask(__obj, __genmask) \
1582 !((__obj)->genmask & __genmask)
1583
1584 /*
1585 * Set element transaction helpers
1586 */
1587
nft_set_elem_active(const struct nft_set_ext * ext,u8 genmask)1588 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1589 u8 genmask)
1590 {
1591 return !(ext->genmask & genmask);
1592 }
1593
nft_set_elem_change_active(const struct net * net,const struct nft_set * set,struct nft_set_ext * ext)1594 static inline void nft_set_elem_change_active(const struct net *net,
1595 const struct nft_set *set,
1596 struct nft_set_ext *ext)
1597 {
1598 ext->genmask ^= nft_genmask_next(net);
1599 }
1600
1601 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1602
1603 #define NFT_SET_ELEM_DEAD_MASK (1 << 2)
1604
1605 #if defined(__LITTLE_ENDIAN_BITFIELD)
1606 #define NFT_SET_ELEM_DEAD_BIT 2
1607 #elif defined(__BIG_ENDIAN_BITFIELD)
1608 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1609 #else
1610 #error
1611 #endif
1612
nft_set_elem_dead(struct nft_set_ext * ext)1613 static inline void nft_set_elem_dead(struct nft_set_ext *ext)
1614 {
1615 unsigned long *word = (unsigned long *)ext;
1616
1617 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1618 set_bit(NFT_SET_ELEM_DEAD_BIT, word);
1619 }
1620
nft_set_elem_is_dead(const struct nft_set_ext * ext)1621 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
1622 {
1623 unsigned long *word = (unsigned long *)ext;
1624
1625 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1626 return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
1627 }
1628
1629 /**
1630 * struct nft_trans - nf_tables object update in transaction
1631 *
1632 * @list: used internally
1633 * @net: struct net
1634 * @table: struct nft_table the object resides in
1635 * @msg_type: message type
1636 * @seq: netlink sequence number
1637 * @flags: modifiers to new request
1638 * @report: notify via unicast netlink message
1639 * @put_net: net needs to be put
1640 *
1641 * This is the information common to all objects in the transaction,
1642 * this must always be the first member of derived sub-types.
1643 */
1644 struct nft_trans {
1645 struct list_head list;
1646 struct net *net;
1647 struct nft_table *table;
1648 int msg_type;
1649 u32 seq;
1650 u16 flags;
1651 u8 report:1;
1652 u8 put_net:1;
1653 };
1654
1655 /**
1656 * struct nft_trans_binding - nf_tables object with binding support in transaction
1657 * @nft_trans: base structure, MUST be first member
1658 * @binding_list: list of objects with possible bindings
1659 *
1660 * This is the base type used by objects that can be bound to a chain.
1661 */
1662 struct nft_trans_binding {
1663 struct nft_trans nft_trans;
1664 struct list_head binding_list;
1665 };
1666
1667 struct nft_trans_rule {
1668 struct nft_trans nft_trans;
1669 struct nft_rule *rule;
1670 struct nft_chain *chain;
1671 struct nft_flow_rule *flow;
1672 u32 rule_id;
1673 bool bound;
1674 };
1675
1676 #define nft_trans_container_rule(trans) \
1677 container_of(trans, struct nft_trans_rule, nft_trans)
1678 #define nft_trans_rule(trans) \
1679 nft_trans_container_rule(trans)->rule
1680 #define nft_trans_flow_rule(trans) \
1681 nft_trans_container_rule(trans)->flow
1682 #define nft_trans_rule_id(trans) \
1683 nft_trans_container_rule(trans)->rule_id
1684 #define nft_trans_rule_bound(trans) \
1685 nft_trans_container_rule(trans)->bound
1686 #define nft_trans_rule_chain(trans) \
1687 nft_trans_container_rule(trans)->chain
1688
1689 struct nft_trans_set {
1690 struct nft_trans_binding nft_trans_binding;
1691 struct list_head list_trans_newset;
1692 struct nft_set *set;
1693 u32 set_id;
1694 u32 gc_int;
1695 u64 timeout;
1696 bool update;
1697 bool bound;
1698 u32 size;
1699 };
1700
1701 #define nft_trans_container_set(t) \
1702 container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
1703 #define nft_trans_set(trans) \
1704 nft_trans_container_set(trans)->set
1705 #define nft_trans_set_id(trans) \
1706 nft_trans_container_set(trans)->set_id
1707 #define nft_trans_set_bound(trans) \
1708 nft_trans_container_set(trans)->bound
1709 #define nft_trans_set_update(trans) \
1710 nft_trans_container_set(trans)->update
1711 #define nft_trans_set_timeout(trans) \
1712 nft_trans_container_set(trans)->timeout
1713 #define nft_trans_set_gc_int(trans) \
1714 nft_trans_container_set(trans)->gc_int
1715 #define nft_trans_set_size(trans) \
1716 nft_trans_container_set(trans)->size
1717
1718 struct nft_trans_chain {
1719 struct nft_trans_binding nft_trans_binding;
1720 struct nft_chain *chain;
1721 char *name;
1722 struct nft_stats __percpu *stats;
1723 u8 policy;
1724 bool update;
1725 bool bound;
1726 u32 chain_id;
1727 struct nft_base_chain *basechain;
1728 struct list_head hook_list;
1729 };
1730
1731 #define nft_trans_container_chain(t) \
1732 container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
1733 #define nft_trans_chain(trans) \
1734 nft_trans_container_chain(trans)->chain
1735 #define nft_trans_chain_update(trans) \
1736 nft_trans_container_chain(trans)->update
1737 #define nft_trans_chain_name(trans) \
1738 nft_trans_container_chain(trans)->name
1739 #define nft_trans_chain_stats(trans) \
1740 nft_trans_container_chain(trans)->stats
1741 #define nft_trans_chain_policy(trans) \
1742 nft_trans_container_chain(trans)->policy
1743 #define nft_trans_chain_bound(trans) \
1744 nft_trans_container_chain(trans)->bound
1745 #define nft_trans_chain_id(trans) \
1746 nft_trans_container_chain(trans)->chain_id
1747 #define nft_trans_basechain(trans) \
1748 nft_trans_container_chain(trans)->basechain
1749 #define nft_trans_chain_hooks(trans) \
1750 nft_trans_container_chain(trans)->hook_list
1751
1752 struct nft_trans_table {
1753 struct nft_trans nft_trans;
1754 bool update;
1755 };
1756
1757 #define nft_trans_container_table(trans) \
1758 container_of(trans, struct nft_trans_table, nft_trans)
1759 #define nft_trans_table_update(trans) \
1760 nft_trans_container_table(trans)->update
1761
1762 enum nft_trans_elem_flags {
1763 NFT_TRANS_UPD_TIMEOUT = (1 << 0),
1764 NFT_TRANS_UPD_EXPIRATION = (1 << 1),
1765 };
1766
1767 struct nft_elem_update {
1768 u64 timeout;
1769 u64 expiration;
1770 u8 flags;
1771 };
1772
1773 struct nft_trans_one_elem {
1774 struct nft_elem_priv *priv;
1775 struct nft_elem_update *update;
1776 };
1777
1778 struct nft_trans_elem {
1779 struct nft_trans nft_trans;
1780 struct nft_set *set;
1781 bool bound;
1782 unsigned int nelems;
1783 struct nft_trans_one_elem elems[] __counted_by(nelems);
1784 };
1785
1786 #define nft_trans_container_elem(t) \
1787 container_of(t, struct nft_trans_elem, nft_trans)
1788 #define nft_trans_elem_set(trans) \
1789 nft_trans_container_elem(trans)->set
1790 #define nft_trans_elem_set_bound(trans) \
1791 nft_trans_container_elem(trans)->bound
1792
1793 struct nft_trans_obj {
1794 struct nft_trans nft_trans;
1795 struct nft_object *obj;
1796 struct nft_object *newobj;
1797 bool update;
1798 };
1799
1800 #define nft_trans_container_obj(t) \
1801 container_of(t, struct nft_trans_obj, nft_trans)
1802 #define nft_trans_obj(trans) \
1803 nft_trans_container_obj(trans)->obj
1804 #define nft_trans_obj_newobj(trans) \
1805 nft_trans_container_obj(trans)->newobj
1806 #define nft_trans_obj_update(trans) \
1807 nft_trans_container_obj(trans)->update
1808
1809 struct nft_trans_flowtable {
1810 struct nft_trans nft_trans;
1811 struct nft_flowtable *flowtable;
1812 struct list_head hook_list;
1813 u32 flags;
1814 bool update;
1815 };
1816
1817 #define nft_trans_container_flowtable(t) \
1818 container_of(t, struct nft_trans_flowtable, nft_trans)
1819 #define nft_trans_flowtable(trans) \
1820 nft_trans_container_flowtable(trans)->flowtable
1821 #define nft_trans_flowtable_update(trans) \
1822 nft_trans_container_flowtable(trans)->update
1823 #define nft_trans_flowtable_hooks(trans) \
1824 nft_trans_container_flowtable(trans)->hook_list
1825 #define nft_trans_flowtable_flags(trans) \
1826 nft_trans_container_flowtable(trans)->flags
1827
1828 #define NFT_TRANS_GC_BATCHCOUNT 256
1829
1830 struct nft_trans_gc {
1831 struct list_head list;
1832 struct net *net;
1833 struct nft_set *set;
1834 u32 seq;
1835 u16 count;
1836 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
1837 struct rcu_head rcu;
1838 };
1839
nft_ctx_update(struct nft_ctx * ctx,const struct nft_trans * trans)1840 static inline void nft_ctx_update(struct nft_ctx *ctx,
1841 const struct nft_trans *trans)
1842 {
1843 switch (trans->msg_type) {
1844 case NFT_MSG_NEWRULE:
1845 case NFT_MSG_DELRULE:
1846 case NFT_MSG_DESTROYRULE:
1847 ctx->chain = nft_trans_rule_chain(trans);
1848 break;
1849 case NFT_MSG_NEWCHAIN:
1850 case NFT_MSG_DELCHAIN:
1851 case NFT_MSG_DESTROYCHAIN:
1852 ctx->chain = nft_trans_chain(trans);
1853 break;
1854 default:
1855 ctx->chain = NULL;
1856 break;
1857 }
1858
1859 ctx->net = trans->net;
1860 ctx->table = trans->table;
1861 ctx->family = trans->table->family;
1862 ctx->report = trans->report;
1863 ctx->flags = trans->flags;
1864 ctx->seq = trans->seq;
1865 }
1866
1867 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
1868 unsigned int gc_seq, gfp_t gfp);
1869 void nft_trans_gc_destroy(struct nft_trans_gc *trans);
1870
1871 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
1872 unsigned int gc_seq, gfp_t gfp);
1873 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
1874
1875 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
1876 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
1877
1878 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
1879
1880 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
1881 unsigned int gc_seq);
1882 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
1883
1884 void nft_setelem_data_deactivate(const struct net *net,
1885 const struct nft_set *set,
1886 struct nft_elem_priv *elem_priv);
1887
1888 int __init nft_chain_filter_init(void);
1889 void nft_chain_filter_fini(void);
1890
1891 void __init nft_chain_route_init(void);
1892 void nft_chain_route_fini(void);
1893
1894 void nf_tables_trans_destroy_flush_work(struct net *net);
1895
1896 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1897 __be64 nf_jiffies64_to_msecs(u64 input);
1898
1899 #ifdef CONFIG_MODULES
1900 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1901 #else
nft_request_module(struct net * net,const char * fmt,...)1902 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1903 #endif
1904
1905 struct nftables_pernet {
1906 struct list_head tables;
1907 struct list_head commit_list;
1908 struct list_head destroy_list;
1909 struct list_head commit_set_list;
1910 struct list_head binding_list;
1911 struct list_head module_list;
1912 struct list_head notify_list;
1913 struct mutex commit_mutex;
1914 u64 table_handle;
1915 u64 tstamp;
1916 unsigned int base_seq;
1917 unsigned int gc_seq;
1918 u8 validate_state;
1919 struct work_struct destroy_work;
1920 };
1921
1922 extern unsigned int nf_tables_net_id;
1923
nft_pernet(const struct net * net)1924 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1925 {
1926 return net_generic(net, nf_tables_net_id);
1927 }
1928
nft_net_tstamp(const struct net * net)1929 static inline u64 nft_net_tstamp(const struct net *net)
1930 {
1931 return nft_pernet(net)->tstamp;
1932 }
1933
1934 #define __NFT_REDUCE_READONLY 1UL
1935 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY
1936
nft_reduce_is_readonly(const struct nft_expr * expr)1937 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr)
1938 {
1939 return expr->ops->reduce == NFT_REDUCE_READONLY;
1940 }
1941
1942 void nft_reg_track_update(struct nft_regs_track *track,
1943 const struct nft_expr *expr, u8 dreg, u8 len);
1944 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len);
1945 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg);
1946
nft_reg_track_cmp(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg)1947 static inline bool nft_reg_track_cmp(struct nft_regs_track *track,
1948 const struct nft_expr *expr, u8 dreg)
1949 {
1950 return track->regs[dreg].selector &&
1951 track->regs[dreg].selector->ops == expr->ops &&
1952 track->regs[dreg].num_reg == 0;
1953 }
1954
1955 #endif /* _NET_NF_TABLES_H */
1956