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 const struct nft_set_ext * (*lookup)(const struct net *net,
463 const struct nft_set *set,
464 const u32 *key);
465 const struct nft_set_ext * (*update)(struct nft_set *set,
466 const u32 *key,
467 struct nft_elem_priv *
468 (*new)(struct nft_set *,
469 const struct nft_expr *,
470 struct nft_regs *),
471 const struct nft_expr *expr,
472 struct nft_regs *regs);
473 bool (*delete)(const struct nft_set *set,
474 const u32 *key);
475
476 int (*insert)(const struct net *net,
477 const struct nft_set *set,
478 const struct nft_set_elem *elem,
479 struct nft_elem_priv **priv);
480 void (*activate)(const struct net *net,
481 const struct nft_set *set,
482 struct nft_elem_priv *elem_priv);
483 struct nft_elem_priv * (*deactivate)(const struct net *net,
484 const struct nft_set *set,
485 const struct nft_set_elem *elem);
486 void (*flush)(const struct net *net,
487 const struct nft_set *set,
488 struct nft_elem_priv *priv);
489 void (*remove)(const struct net *net,
490 const struct nft_set *set,
491 struct nft_elem_priv *elem_priv);
492 void (*walk)(const struct nft_ctx *ctx,
493 struct nft_set *set,
494 struct nft_set_iter *iter);
495 struct nft_elem_priv * (*get)(const struct net *net,
496 const struct nft_set *set,
497 const struct nft_set_elem *elem,
498 unsigned int flags);
499 u32 (*ksize)(u32 size);
500 u32 (*usize)(u32 size);
501 u32 (*adjust_maxsize)(const struct nft_set *set);
502 void (*commit)(struct nft_set *set);
503 void (*abort)(const struct nft_set *set);
504 u64 (*privsize)(const struct nlattr * const nla[],
505 const struct nft_set_desc *desc);
506 bool (*estimate)(const struct nft_set_desc *desc,
507 u32 features,
508 struct nft_set_estimate *est);
509 int (*init)(const struct nft_set *set,
510 const struct nft_set_desc *desc,
511 const struct nlattr * const nla[]);
512 void (*destroy)(const struct nft_ctx *ctx,
513 const struct nft_set *set);
514 void (*gc_init)(const struct nft_set *set);
515
516 unsigned int elemsize;
517 };
518
519 /**
520 * struct nft_set_type - nf_tables set type
521 *
522 * @ops: set ops for this type
523 * @features: features supported by the implementation
524 */
525 struct nft_set_type {
526 const struct nft_set_ops ops;
527 u32 features;
528 };
529 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
530
531 struct nft_set_elem_expr {
532 u8 size;
533 unsigned char data[]
534 __attribute__((aligned(__alignof__(struct nft_expr))));
535 };
536
537 #define nft_setelem_expr_at(__elem_expr, __offset) \
538 ((struct nft_expr *)&__elem_expr->data[__offset])
539
540 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
541 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
542 __size < (__elem_expr)->size; \
543 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
544
545 #define NFT_SET_EXPR_MAX 2
546
547 /**
548 * struct nft_set - nf_tables set instance
549 *
550 * @list: table set list node
551 * @bindings: list of set bindings
552 * @refs: internal refcounting for async set destruction
553 * @table: table this set belongs to
554 * @net: netnamespace this set belongs to
555 * @name: name of the set
556 * @handle: unique handle of the set
557 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
558 * @dtype: data type (verdict or numeric type defined by userspace)
559 * @objtype: object type (see NFT_OBJECT_* definitions)
560 * @size: maximum set size
561 * @field_len: length of each field in concatenation, bytes
562 * @field_count: number of concatenated fields in element
563 * @use: number of rules references to this set
564 * @nelems: number of elements
565 * @ndeact: number of deactivated elements queued for removal
566 * @timeout: default timeout value in jiffies
567 * @gc_int: garbage collection interval in msecs
568 * @policy: set parameterization (see enum nft_set_policies)
569 * @udlen: user data length
570 * @udata: user data
571 * @pending_update: list of pending update set element
572 * @ops: set ops
573 * @flags: set flags
574 * @dead: set will be freed, never cleared
575 * @genmask: generation mask
576 * @klen: key length
577 * @dlen: data length
578 * @num_exprs: numbers of exprs
579 * @exprs: stateful expression
580 * @catchall_list: list of catch-all set element
581 * @data: private set data
582 */
583 struct nft_set {
584 struct list_head list;
585 struct list_head bindings;
586 refcount_t refs;
587 struct nft_table *table;
588 possible_net_t net;
589 char *name;
590 u64 handle;
591 u32 ktype;
592 u32 dtype;
593 u32 objtype;
594 u32 size;
595 u8 field_len[NFT_REG32_COUNT];
596 u8 field_count;
597 u32 use;
598 atomic_t nelems;
599 u32 ndeact;
600 u64 timeout;
601 u32 gc_int;
602 u16 policy;
603 u16 udlen;
604 unsigned char *udata;
605 struct list_head pending_update;
606 /* runtime data below here */
607 const struct nft_set_ops *ops ____cacheline_aligned;
608 u16 flags:13,
609 dead:1,
610 genmask:2;
611 u8 klen;
612 u8 dlen;
613 u8 num_exprs;
614 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
615 struct list_head catchall_list;
616 unsigned char data[]
617 __attribute__((aligned(__alignof__(u64))));
618 };
619
nft_set_is_anonymous(const struct nft_set * set)620 static inline bool nft_set_is_anonymous(const struct nft_set *set)
621 {
622 return set->flags & NFT_SET_ANONYMOUS;
623 }
624
nft_set_priv(const struct nft_set * set)625 static inline void *nft_set_priv(const struct nft_set *set)
626 {
627 return (void *)set->data;
628 }
629
nft_set_datatype(const struct nft_set * set)630 static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
631 {
632 return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
633 }
634
nft_set_gc_is_pending(const struct nft_set * s)635 static inline bool nft_set_gc_is_pending(const struct nft_set *s)
636 {
637 return refcount_read(&s->refs) != 1;
638 }
639
nft_set_container_of(const void * priv)640 static inline struct nft_set *nft_set_container_of(const void *priv)
641 {
642 return (void *)priv - offsetof(struct nft_set, data);
643 }
644
645 struct nft_set *nft_set_lookup_global(const struct net *net,
646 const struct nft_table *table,
647 const struct nlattr *nla_set_name,
648 const struct nlattr *nla_set_id,
649 u8 genmask);
650
651 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
652 const struct nft_set *set);
653
nft_set_gc_interval(const struct nft_set * set)654 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
655 {
656 u32 gc_int = READ_ONCE(set->gc_int);
657
658 return gc_int ? msecs_to_jiffies(gc_int) : HZ;
659 }
660
661 /**
662 * struct nft_set_binding - nf_tables set binding
663 *
664 * @list: set bindings list node
665 * @chain: chain containing the rule bound to the set
666 * @flags: set action flags
667 *
668 * A set binding contains all information necessary for validation
669 * of new elements added to a bound set.
670 */
671 struct nft_set_binding {
672 struct list_head list;
673 const struct nft_chain *chain;
674 u32 flags;
675 };
676
677 enum nft_trans_phase;
678 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
679 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
680 struct nft_set_binding *binding,
681 enum nft_trans_phase phase);
682 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
683 struct nft_set_binding *binding);
684 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
685
686 /**
687 * enum nft_set_extensions - set extension type IDs
688 *
689 * @NFT_SET_EXT_KEY: element key
690 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
691 * @NFT_SET_EXT_DATA: mapping data
692 * @NFT_SET_EXT_FLAGS: element flags
693 * @NFT_SET_EXT_TIMEOUT: element timeout
694 * @NFT_SET_EXT_USERDATA: user data associated with the element
695 * @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
696 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
697 * @NFT_SET_EXT_NUM: number of extension types
698 */
699 enum nft_set_extensions {
700 NFT_SET_EXT_KEY,
701 NFT_SET_EXT_KEY_END,
702 NFT_SET_EXT_DATA,
703 NFT_SET_EXT_FLAGS,
704 NFT_SET_EXT_TIMEOUT,
705 NFT_SET_EXT_USERDATA,
706 NFT_SET_EXT_EXPRESSIONS,
707 NFT_SET_EXT_OBJREF,
708 NFT_SET_EXT_NUM
709 };
710
711 /**
712 * struct nft_set_ext_type - set extension type
713 *
714 * @len: fixed part length of the extension
715 * @align: alignment requirements of the extension
716 */
717 struct nft_set_ext_type {
718 u8 len;
719 u8 align;
720 };
721
722 extern const struct nft_set_ext_type nft_set_ext_types[];
723
724 /**
725 * struct nft_set_ext_tmpl - set extension template
726 *
727 * @len: length of extension area
728 * @offset: offsets of individual extension types
729 * @ext_len: length of the expected extension(used to sanity check)
730 */
731 struct nft_set_ext_tmpl {
732 u16 len;
733 u8 offset[NFT_SET_EXT_NUM];
734 u8 ext_len[NFT_SET_EXT_NUM];
735 };
736
737 /**
738 * struct nft_set_ext - set extensions
739 *
740 * @genmask: generation mask, but also flags (see NFT_SET_ELEM_DEAD_BIT)
741 * @offset: offsets of individual extension types
742 * @data: beginning of extension data
743 *
744 * This structure must be aligned to word size, otherwise atomic bitops
745 * on genmask field can cause alignment failure on some archs.
746 */
747 struct nft_set_ext {
748 u8 genmask;
749 u8 offset[NFT_SET_EXT_NUM];
750 char data[];
751 } __aligned(BITS_PER_LONG / 8);
752
nft_set_ext_prepare(struct nft_set_ext_tmpl * tmpl)753 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
754 {
755 memset(tmpl, 0, sizeof(*tmpl));
756 tmpl->len = sizeof(struct nft_set_ext);
757 }
758
nft_set_ext_add_length(struct nft_set_ext_tmpl * tmpl,u8 id,unsigned int len)759 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
760 unsigned int len)
761 {
762 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
763 if (tmpl->len > U8_MAX)
764 return -EINVAL;
765
766 tmpl->offset[id] = tmpl->len;
767 tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
768 tmpl->len += tmpl->ext_len[id];
769
770 return 0;
771 }
772
nft_set_ext_add(struct nft_set_ext_tmpl * tmpl,u8 id)773 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
774 {
775 return nft_set_ext_add_length(tmpl, id, 0);
776 }
777
nft_set_ext_init(struct nft_set_ext * ext,const struct nft_set_ext_tmpl * tmpl)778 static inline void nft_set_ext_init(struct nft_set_ext *ext,
779 const struct nft_set_ext_tmpl *tmpl)
780 {
781 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
782 }
783
__nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)784 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
785 {
786 return !!ext->offset[id];
787 }
788
nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)789 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
790 {
791 return ext && __nft_set_ext_exists(ext, id);
792 }
793
nft_set_ext(const struct nft_set_ext * ext,u8 id)794 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
795 {
796 return (void *)ext + ext->offset[id];
797 }
798
nft_set_ext_key(const struct nft_set_ext * ext)799 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
800 {
801 return nft_set_ext(ext, NFT_SET_EXT_KEY);
802 }
803
nft_set_ext_key_end(const struct nft_set_ext * ext)804 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
805 {
806 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
807 }
808
nft_set_ext_data(const struct nft_set_ext * ext)809 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
810 {
811 return nft_set_ext(ext, NFT_SET_EXT_DATA);
812 }
813
nft_set_ext_flags(const struct nft_set_ext * ext)814 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
815 {
816 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
817 }
818
819 struct nft_timeout {
820 u64 timeout;
821 u64 expiration;
822 };
823
nft_set_ext_timeout(const struct nft_set_ext * ext)824 static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
825 {
826 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
827 }
828
nft_set_ext_userdata(const struct nft_set_ext * ext)829 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
830 {
831 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
832 }
833
nft_set_ext_expr(const struct nft_set_ext * ext)834 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
835 {
836 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
837 }
838
__nft_set_elem_expired(const struct nft_set_ext * ext,u64 tstamp)839 static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
840 u64 tstamp)
841 {
842 if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
843 READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
844 return false;
845
846 return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
847 }
848
nft_set_elem_expired(const struct nft_set_ext * ext)849 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
850 {
851 return __nft_set_elem_expired(ext, get_jiffies_64());
852 }
853
nft_set_elem_ext(const struct nft_set * set,const struct nft_elem_priv * elem_priv)854 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
855 const struct nft_elem_priv *elem_priv)
856 {
857 return (void *)elem_priv + set->ops->elemsize;
858 }
859
nft_set_ext_obj(const struct nft_set_ext * ext)860 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
861 {
862 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
863 }
864
865 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
866 const struct nft_set *set,
867 const struct nlattr *attr);
868
869 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
870 const struct nft_set_ext_tmpl *tmpl,
871 const u32 *key, const u32 *key_end,
872 const u32 *data,
873 u64 timeout, u64 expiration, gfp_t gfp);
874 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
875 struct nft_expr *expr_array[]);
876 void nft_set_elem_destroy(const struct nft_set *set,
877 const struct nft_elem_priv *elem_priv,
878 bool destroy_expr);
879 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
880 const struct nft_set *set,
881 const struct nft_elem_priv *elem_priv);
882
883 struct nft_expr_ops;
884 /**
885 * struct nft_expr_type - nf_tables expression type
886 *
887 * @select_ops: function to select nft_expr_ops
888 * @release_ops: release nft_expr_ops
889 * @ops: default ops, used when no select_ops functions is present
890 * @inner_ops: inner ops, used for inner packet operation
891 * @list: used internally
892 * @name: Identifier
893 * @owner: module reference
894 * @policy: netlink attribute policy
895 * @maxattr: highest netlink attribute number
896 * @family: address family for AF-specific types
897 * @flags: expression type flags
898 */
899 struct nft_expr_type {
900 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
901 const struct nlattr * const tb[]);
902 void (*release_ops)(const struct nft_expr_ops *ops);
903 const struct nft_expr_ops *ops;
904 const struct nft_expr_ops *inner_ops;
905 struct list_head list;
906 const char *name;
907 struct module *owner;
908 const struct nla_policy *policy;
909 unsigned int maxattr;
910 u8 family;
911 u8 flags;
912 };
913
914 #define NFT_EXPR_STATEFUL 0x1
915 #define NFT_EXPR_GC 0x2
916
917 enum nft_trans_phase {
918 NFT_TRANS_PREPARE,
919 NFT_TRANS_PREPARE_ERROR,
920 NFT_TRANS_ABORT,
921 NFT_TRANS_COMMIT,
922 NFT_TRANS_RELEASE
923 };
924
925 struct nft_flow_rule;
926 struct nft_offload_ctx;
927
928 /**
929 * struct nft_expr_ops - nf_tables expression operations
930 *
931 * @eval: Expression evaluation function
932 * @clone: Expression clone function
933 * @size: full expression size, including private data size
934 * @init: initialization function
935 * @activate: activate expression in the next generation
936 * @deactivate: deactivate expression in next generation
937 * @destroy: destruction function, called after synchronize_rcu
938 * @destroy_clone: destruction clone function
939 * @dump: function to dump parameters
940 * @validate: validate expression, called during loop detection
941 * @reduce: reduce expression
942 * @gc: garbage collection expression
943 * @offload: hardware offload expression
944 * @offload_action: function to report true/false to allocate one slot or not in the flow
945 * offload array
946 * @offload_stats: function to synchronize hardware stats via updating the counter expression
947 * @type: expression type
948 * @data: extra data to attach to this expression operation
949 */
950 struct nft_expr_ops {
951 void (*eval)(const struct nft_expr *expr,
952 struct nft_regs *regs,
953 const struct nft_pktinfo *pkt);
954 int (*clone)(struct nft_expr *dst,
955 const struct nft_expr *src, gfp_t gfp);
956 unsigned int size;
957
958 int (*init)(const struct nft_ctx *ctx,
959 const struct nft_expr *expr,
960 const struct nlattr * const tb[]);
961 void (*activate)(const struct nft_ctx *ctx,
962 const struct nft_expr *expr);
963 void (*deactivate)(const struct nft_ctx *ctx,
964 const struct nft_expr *expr,
965 enum nft_trans_phase phase);
966 void (*destroy)(const struct nft_ctx *ctx,
967 const struct nft_expr *expr);
968 void (*destroy_clone)(const struct nft_ctx *ctx,
969 const struct nft_expr *expr);
970 int (*dump)(struct sk_buff *skb,
971 const struct nft_expr *expr,
972 bool reset);
973 int (*validate)(const struct nft_ctx *ctx,
974 const struct nft_expr *expr);
975 bool (*reduce)(struct nft_regs_track *track,
976 const struct nft_expr *expr);
977 bool (*gc)(struct net *net,
978 const struct nft_expr *expr);
979 int (*offload)(struct nft_offload_ctx *ctx,
980 struct nft_flow_rule *flow,
981 const struct nft_expr *expr);
982 bool (*offload_action)(const struct nft_expr *expr);
983 void (*offload_stats)(struct nft_expr *expr,
984 const struct flow_stats *stats);
985 const struct nft_expr_type *type;
986 void *data;
987 };
988
989 /**
990 * struct nft_rule - nf_tables rule
991 *
992 * @list: used internally
993 * @handle: rule handle
994 * @genmask: generation mask
995 * @dlen: length of expression data
996 * @udata: user data is appended to the rule
997 * @data: expression data
998 */
999 struct nft_rule {
1000 struct list_head list;
1001 u64 handle:42,
1002 genmask:2,
1003 dlen:12,
1004 udata:1;
1005 unsigned char data[]
1006 __attribute__((aligned(__alignof__(struct nft_expr))));
1007 };
1008
nft_expr_first(const struct nft_rule * rule)1009 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
1010 {
1011 return (struct nft_expr *)&rule->data[0];
1012 }
1013
nft_expr_next(const struct nft_expr * expr)1014 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
1015 {
1016 return ((void *)expr) + expr->ops->size;
1017 }
1018
nft_expr_last(const struct nft_rule * rule)1019 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
1020 {
1021 return (struct nft_expr *)&rule->data[rule->dlen];
1022 }
1023
nft_expr_more(const struct nft_rule * rule,const struct nft_expr * expr)1024 static inline bool nft_expr_more(const struct nft_rule *rule,
1025 const struct nft_expr *expr)
1026 {
1027 return expr != nft_expr_last(rule) && expr->ops;
1028 }
1029
nft_userdata(const struct nft_rule * rule)1030 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
1031 {
1032 return (void *)&rule->data[rule->dlen];
1033 }
1034
1035 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
1036 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
1037 enum nft_trans_phase phase);
1038 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
1039
nft_set_elem_update_expr(const struct nft_set_ext * ext,struct nft_regs * regs,const struct nft_pktinfo * pkt)1040 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
1041 struct nft_regs *regs,
1042 const struct nft_pktinfo *pkt)
1043 {
1044 struct nft_set_elem_expr *elem_expr;
1045 struct nft_expr *expr;
1046 u32 size;
1047
1048 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
1049 elem_expr = nft_set_ext_expr(ext);
1050 nft_setelem_expr_foreach(expr, elem_expr, size) {
1051 expr->ops->eval(expr, regs, pkt);
1052 if (regs->verdict.code == NFT_BREAK)
1053 return;
1054 }
1055 }
1056 }
1057
1058 /*
1059 * The last pointer isn't really necessary, but the compiler isn't able to
1060 * determine that the result of nft_expr_last() is always the same since it
1061 * can't assume that the dlen value wasn't changed within calls in the loop.
1062 */
1063 #define nft_rule_for_each_expr(expr, last, rule) \
1064 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
1065 (expr) != (last); \
1066 (expr) = nft_expr_next(expr))
1067
1068 #define NFT_CHAIN_POLICY_UNSET U8_MAX
1069
1070 struct nft_rule_dp {
1071 u64 is_last:1,
1072 dlen:12,
1073 handle:42; /* for tracing */
1074 unsigned char data[]
1075 __attribute__((aligned(__alignof__(struct nft_expr))));
1076 };
1077
1078 struct nft_rule_dp_last {
1079 struct nft_rule_dp end; /* end of nft_rule_blob marker */
1080 struct rcu_head h; /* call_rcu head */
1081 struct nft_rule_blob *blob; /* ptr to free via call_rcu */
1082 const struct nft_chain *chain; /* for nftables tracing */
1083 };
1084
nft_rule_next(const struct nft_rule_dp * rule)1085 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
1086 {
1087 return (void *)rule + sizeof(*rule) + rule->dlen;
1088 }
1089
1090 struct nft_rule_blob {
1091 unsigned long size;
1092 unsigned char data[]
1093 __attribute__((aligned(__alignof__(struct nft_rule_dp))));
1094 };
1095
1096 /**
1097 * struct nft_chain - nf_tables chain
1098 *
1099 * @blob_gen_0: rule blob pointer to the current generation
1100 * @blob_gen_1: rule blob pointer to the future generation
1101 * @rules: list of rules in the chain
1102 * @list: used internally
1103 * @rhlhead: used internally
1104 * @table: table that this chain belongs to
1105 * @handle: chain handle
1106 * @use: number of jump references to this chain
1107 * @flags: bitmask of enum NFTA_CHAIN_FLAGS
1108 * @bound: bind or not
1109 * @genmask: generation mask
1110 * @name: name of the chain
1111 * @udlen: user data length
1112 * @udata: user data in the chain
1113 * @blob_next: rule blob pointer to the next in the chain
1114 */
1115 struct nft_chain {
1116 struct nft_rule_blob __rcu *blob_gen_0;
1117 struct nft_rule_blob __rcu *blob_gen_1;
1118 struct list_head rules;
1119 struct list_head list;
1120 struct rhlist_head rhlhead;
1121 struct nft_table *table;
1122 u64 handle;
1123 u32 use;
1124 u8 flags:5,
1125 bound:1,
1126 genmask:2;
1127 char *name;
1128 u16 udlen;
1129 u8 *udata;
1130
1131 /* Only used during control plane commit phase: */
1132 struct nft_rule_blob *blob_next;
1133 };
1134
1135 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain);
1136 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
1137 const struct nft_set_iter *iter,
1138 struct nft_elem_priv *elem_priv);
1139 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
1140 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1141 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1142
1143 enum nft_chain_types {
1144 NFT_CHAIN_T_DEFAULT = 0,
1145 NFT_CHAIN_T_ROUTE,
1146 NFT_CHAIN_T_NAT,
1147 NFT_CHAIN_T_MAX
1148 };
1149
1150 /**
1151 * struct nft_chain_type - nf_tables chain type info
1152 *
1153 * @name: name of the type
1154 * @type: numeric identifier
1155 * @family: address family
1156 * @owner: module owner
1157 * @hook_mask: mask of valid hooks
1158 * @hooks: array of hook functions
1159 * @ops_register: base chain register function
1160 * @ops_unregister: base chain unregister function
1161 */
1162 struct nft_chain_type {
1163 const char *name;
1164 enum nft_chain_types type;
1165 int family;
1166 struct module *owner;
1167 unsigned int hook_mask;
1168 nf_hookfn *hooks[NFT_MAX_HOOKS];
1169 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1170 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1171 };
1172
1173 int nft_chain_validate_dependency(const struct nft_chain *chain,
1174 enum nft_chain_types type);
1175 int nft_chain_validate_hooks(const struct nft_chain *chain,
1176 unsigned int hook_flags);
1177
nft_chain_binding(const struct nft_chain * chain)1178 static inline bool nft_chain_binding(const struct nft_chain *chain)
1179 {
1180 return chain->flags & NFT_CHAIN_BINDING;
1181 }
1182
nft_chain_is_bound(struct nft_chain * chain)1183 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1184 {
1185 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1186 }
1187
1188 int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
1189 void nft_chain_del(struct nft_chain *chain);
1190 void nf_tables_chain_destroy(struct nft_chain *chain);
1191
1192 struct nft_stats {
1193 u64 bytes;
1194 u64 pkts;
1195 struct u64_stats_sync syncp;
1196 };
1197
1198 struct nft_hook {
1199 struct list_head list;
1200 struct nf_hook_ops ops;
1201 struct rcu_head rcu;
1202 };
1203
1204 /**
1205 * struct nft_base_chain - nf_tables base chain
1206 *
1207 * @ops: netfilter hook ops
1208 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1209 * @type: chain type
1210 * @policy: default policy
1211 * @flags: indicate the base chain disabled or not
1212 * @stats: per-cpu chain stats
1213 * @chain: the chain
1214 * @flow_block: flow block (for hardware offload)
1215 */
1216 struct nft_base_chain {
1217 struct nf_hook_ops ops;
1218 struct list_head hook_list;
1219 const struct nft_chain_type *type;
1220 u8 policy;
1221 u8 flags;
1222 struct nft_stats __percpu *stats;
1223 struct nft_chain chain;
1224 struct flow_block flow_block;
1225 };
1226
nft_base_chain(const struct nft_chain * chain)1227 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1228 {
1229 return container_of(chain, struct nft_base_chain, chain);
1230 }
1231
nft_is_base_chain(const struct nft_chain * chain)1232 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1233 {
1234 return chain->flags & NFT_CHAIN_BASE;
1235 }
1236
1237 int __nft_release_basechain(struct nft_ctx *ctx);
1238
1239 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1240
nft_use_inc(u32 * use)1241 static inline bool nft_use_inc(u32 *use)
1242 {
1243 if (*use == UINT_MAX)
1244 return false;
1245
1246 (*use)++;
1247
1248 return true;
1249 }
1250
nft_use_dec(u32 * use)1251 static inline void nft_use_dec(u32 *use)
1252 {
1253 WARN_ON_ONCE((*use)-- == 0);
1254 }
1255
1256 /* For error and abort path: restore use counter to previous state. */
nft_use_inc_restore(u32 * use)1257 static inline void nft_use_inc_restore(u32 *use)
1258 {
1259 WARN_ON_ONCE(!nft_use_inc(use));
1260 }
1261
1262 #define nft_use_dec_restore nft_use_dec
1263
1264 /**
1265 * struct nft_table - nf_tables table
1266 *
1267 * @list: used internally
1268 * @chains_ht: chains in the table
1269 * @chains: same, for stable walks
1270 * @sets: sets in the table
1271 * @objects: stateful objects in the table
1272 * @flowtables: flow tables in the table
1273 * @hgenerator: handle generator state
1274 * @handle: table handle
1275 * @use: number of chain references to this table
1276 * @family:address family
1277 * @flags: table flag (see enum nft_table_flags)
1278 * @genmask: generation mask
1279 * @nlpid: netlink port ID
1280 * @name: name of the table
1281 * @udlen: length of the user data
1282 * @udata: user data
1283 * @validate_state: internal, set when transaction adds jumps
1284 */
1285 struct nft_table {
1286 struct list_head list;
1287 struct rhltable chains_ht;
1288 struct list_head chains;
1289 struct list_head sets;
1290 struct list_head objects;
1291 struct list_head flowtables;
1292 u64 hgenerator;
1293 u64 handle;
1294 u32 use;
1295 u16 family:6,
1296 flags:8,
1297 genmask:2;
1298 u32 nlpid;
1299 char *name;
1300 u16 udlen;
1301 u8 *udata;
1302 u8 validate_state;
1303 };
1304
nft_table_has_owner(const struct nft_table * table)1305 static inline bool nft_table_has_owner(const struct nft_table *table)
1306 {
1307 return table->flags & NFT_TABLE_F_OWNER;
1308 }
1309
nft_table_is_orphan(const struct nft_table * table)1310 static inline bool nft_table_is_orphan(const struct nft_table *table)
1311 {
1312 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
1313 NFT_TABLE_F_PERSIST;
1314 }
1315
nft_base_chain_netdev(int family,u32 hooknum)1316 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1317 {
1318 return family == NFPROTO_NETDEV ||
1319 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1320 }
1321
1322 void nft_register_chain_type(const struct nft_chain_type *);
1323 void nft_unregister_chain_type(const struct nft_chain_type *);
1324
1325 int nft_register_expr(struct nft_expr_type *);
1326 void nft_unregister_expr(struct nft_expr_type *);
1327
1328 int nft_verdict_dump(struct sk_buff *skb, int type,
1329 const struct nft_verdict *v);
1330
1331 /**
1332 * struct nft_object_hash_key - key to lookup nft_object
1333 *
1334 * @name: name of the stateful object to look up
1335 * @table: table the object belongs to
1336 */
1337 struct nft_object_hash_key {
1338 const char *name;
1339 const struct nft_table *table;
1340 };
1341
1342 /**
1343 * struct nft_object - nf_tables stateful object
1344 *
1345 * @list: table stateful object list node
1346 * @rhlhead: nft_objname_ht node
1347 * @key: keys that identify this object
1348 * @genmask: generation mask
1349 * @use: number of references to this stateful object
1350 * @handle: unique object handle
1351 * @udlen: length of user data
1352 * @udata: user data
1353 * @ops: object operations
1354 * @data: object data, layout depends on type
1355 */
1356 struct nft_object {
1357 struct list_head list;
1358 struct rhlist_head rhlhead;
1359 struct nft_object_hash_key key;
1360 u32 genmask:2;
1361 u32 use;
1362 u64 handle;
1363 u16 udlen;
1364 u8 *udata;
1365 /* runtime data below here */
1366 const struct nft_object_ops *ops ____cacheline_aligned;
1367 unsigned char data[]
1368 __attribute__((aligned(__alignof__(u64))));
1369 };
1370
nft_obj_data(const struct nft_object * obj)1371 static inline void *nft_obj_data(const struct nft_object *obj)
1372 {
1373 return (void *)obj->data;
1374 }
1375
1376 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1377
1378 struct nft_object *nft_obj_lookup(const struct net *net,
1379 const struct nft_table *table,
1380 const struct nlattr *nla, u32 objtype,
1381 u8 genmask);
1382
1383 void nft_obj_notify(struct net *net, const struct nft_table *table,
1384 struct nft_object *obj, u32 portid, u32 seq,
1385 int event, u16 flags, int family, int report, gfp_t gfp);
1386
1387 /**
1388 * struct nft_object_type - stateful object type
1389 *
1390 * @select_ops: function to select nft_object_ops
1391 * @ops: default ops, used when no select_ops functions is present
1392 * @list: list node in list of object types
1393 * @type: stateful object numeric type
1394 * @owner: module owner
1395 * @maxattr: maximum netlink attribute
1396 * @family: address family for AF-specific object types
1397 * @policy: netlink attribute policy
1398 */
1399 struct nft_object_type {
1400 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1401 const struct nlattr * const tb[]);
1402 const struct nft_object_ops *ops;
1403 struct list_head list;
1404 u32 type;
1405 unsigned int maxattr;
1406 u8 family;
1407 struct module *owner;
1408 const struct nla_policy *policy;
1409 };
1410
1411 /**
1412 * struct nft_object_ops - stateful object operations
1413 *
1414 * @eval: stateful object evaluation function
1415 * @size: stateful object size
1416 * @init: initialize object from netlink attributes
1417 * @destroy: release existing stateful object
1418 * @dump: netlink dump stateful object
1419 * @update: update stateful object
1420 * @type: pointer to object type
1421 */
1422 struct nft_object_ops {
1423 void (*eval)(struct nft_object *obj,
1424 struct nft_regs *regs,
1425 const struct nft_pktinfo *pkt);
1426 unsigned int size;
1427 int (*init)(const struct nft_ctx *ctx,
1428 const struct nlattr *const tb[],
1429 struct nft_object *obj);
1430 void (*destroy)(const struct nft_ctx *ctx,
1431 struct nft_object *obj);
1432 int (*dump)(struct sk_buff *skb,
1433 struct nft_object *obj,
1434 bool reset);
1435 void (*update)(struct nft_object *obj,
1436 struct nft_object *newobj);
1437 const struct nft_object_type *type;
1438 };
1439
1440 int nft_register_obj(struct nft_object_type *obj_type);
1441 void nft_unregister_obj(struct nft_object_type *obj_type);
1442
1443 #define NFT_NETDEVICE_MAX 256
1444
1445 /**
1446 * struct nft_flowtable - nf_tables flow table
1447 *
1448 * @list: flow table list node in table list
1449 * @table: the table the flow table is contained in
1450 * @name: name of this flow table
1451 * @hooknum: hook number
1452 * @ops_len: number of hooks in array
1453 * @genmask: generation mask
1454 * @use: number of references to this flow table
1455 * @handle: unique object handle
1456 * @hook_list: hook list for hooks per net_device in flowtables
1457 * @data: rhashtable and garbage collector
1458 */
1459 struct nft_flowtable {
1460 struct list_head list;
1461 struct nft_table *table;
1462 char *name;
1463 int hooknum;
1464 int ops_len;
1465 u32 genmask:2;
1466 u32 use;
1467 u64 handle;
1468 /* runtime data below here */
1469 struct list_head hook_list ____cacheline_aligned;
1470 struct nf_flowtable data;
1471 };
1472
1473 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table,
1474 const struct nlattr *nla,
1475 u8 genmask);
1476
1477 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1478 struct nft_flowtable *flowtable,
1479 enum nft_trans_phase phase);
1480
1481 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1482 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1483
1484 /**
1485 * struct nft_traceinfo - nft tracing information and state
1486 *
1487 * @trace: other struct members are initialised
1488 * @nf_trace: copy of skb->nf_trace before rule evaluation
1489 * @type: event type (enum nft_trace_types)
1490 * @skbid: hash of skb to be used as trace id
1491 * @packet_dumped: packet headers sent in a previous traceinfo message
1492 * @basechain: base chain currently processed
1493 */
1494 struct nft_traceinfo {
1495 bool trace;
1496 bool nf_trace;
1497 bool packet_dumped;
1498 enum nft_trace_types type:8;
1499 u32 skbid;
1500 const struct nft_base_chain *basechain;
1501 };
1502
1503 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1504 const struct nft_chain *basechain);
1505
1506 void nft_trace_notify(const struct nft_pktinfo *pkt,
1507 const struct nft_verdict *verdict,
1508 const struct nft_rule_dp *rule,
1509 struct nft_traceinfo *info);
1510
1511 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1512 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1513
1514 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1515 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1516
1517 #define MODULE_ALIAS_NFT_EXPR(name) \
1518 MODULE_ALIAS("nft-expr-" name)
1519
1520 #define MODULE_ALIAS_NFT_OBJ(type) \
1521 MODULE_ALIAS("nft-obj-" __stringify(type))
1522
1523 #if IS_ENABLED(CONFIG_NF_TABLES)
1524
1525 /*
1526 * The gencursor defines two generations, the currently active and the
1527 * next one. Objects contain a bitmask of 2 bits specifying the generations
1528 * they're active in. A set bit means they're inactive in the generation
1529 * represented by that bit.
1530 *
1531 * New objects start out as inactive in the current and active in the
1532 * next generation. When committing the ruleset the bitmask is cleared,
1533 * meaning they're active in all generations. When removing an object,
1534 * it is set inactive in the next generation. After committing the ruleset,
1535 * the objects are removed.
1536 */
nft_gencursor_next(const struct net * net)1537 static inline unsigned int nft_gencursor_next(const struct net *net)
1538 {
1539 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1540 }
1541
nft_genmask_next(const struct net * net)1542 static inline u8 nft_genmask_next(const struct net *net)
1543 {
1544 return 1 << nft_gencursor_next(net);
1545 }
1546
nft_genmask_cur(const struct net * net)1547 static inline u8 nft_genmask_cur(const struct net *net)
1548 {
1549 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1550 return 1 << READ_ONCE(net->nft.gencursor);
1551 }
1552
1553 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1554
1555 /*
1556 * Generic transaction helpers
1557 */
1558
1559 /* Check if this object is currently active. */
1560 #define nft_is_active(__net, __obj) \
1561 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1562
1563 /* Check if this object is active in the next generation. */
1564 #define nft_is_active_next(__net, __obj) \
1565 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1566
1567 /* This object becomes active in the next generation. */
1568 #define nft_activate_next(__net, __obj) \
1569 (__obj)->genmask = nft_genmask_cur(__net)
1570
1571 /* This object becomes inactive in the next generation. */
1572 #define nft_deactivate_next(__net, __obj) \
1573 (__obj)->genmask = nft_genmask_next(__net)
1574
1575 /* After committing the ruleset, clear the stale generation bit. */
1576 #define nft_clear(__net, __obj) \
1577 (__obj)->genmask &= ~nft_genmask_next(__net)
1578 #define nft_active_genmask(__obj, __genmask) \
1579 !((__obj)->genmask & __genmask)
1580
1581 /*
1582 * Set element transaction helpers
1583 */
1584
nft_set_elem_active(const struct nft_set_ext * ext,u8 genmask)1585 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1586 u8 genmask)
1587 {
1588 return !(ext->genmask & genmask);
1589 }
1590
nft_set_elem_change_active(const struct net * net,const struct nft_set * set,struct nft_set_ext * ext)1591 static inline void nft_set_elem_change_active(const struct net *net,
1592 const struct nft_set *set,
1593 struct nft_set_ext *ext)
1594 {
1595 ext->genmask ^= nft_genmask_next(net);
1596 }
1597
1598 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1599
1600 #define NFT_SET_ELEM_DEAD_MASK (1 << 2)
1601
1602 #if defined(__LITTLE_ENDIAN_BITFIELD)
1603 #define NFT_SET_ELEM_DEAD_BIT 2
1604 #elif defined(__BIG_ENDIAN_BITFIELD)
1605 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1606 #else
1607 #error
1608 #endif
1609
nft_set_elem_dead(struct nft_set_ext * ext)1610 static inline void nft_set_elem_dead(struct nft_set_ext *ext)
1611 {
1612 unsigned long *word = (unsigned long *)ext;
1613
1614 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1615 set_bit(NFT_SET_ELEM_DEAD_BIT, word);
1616 }
1617
nft_set_elem_is_dead(const struct nft_set_ext * ext)1618 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
1619 {
1620 unsigned long *word = (unsigned long *)ext;
1621
1622 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1623 return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
1624 }
1625
1626 /**
1627 * struct nft_trans - nf_tables object update in transaction
1628 *
1629 * @list: used internally
1630 * @net: struct net
1631 * @table: struct nft_table the object resides in
1632 * @msg_type: message type
1633 * @seq: netlink sequence number
1634 * @flags: modifiers to new request
1635 * @report: notify via unicast netlink message
1636 * @put_net: net needs to be put
1637 *
1638 * This is the information common to all objects in the transaction,
1639 * this must always be the first member of derived sub-types.
1640 */
1641 struct nft_trans {
1642 struct list_head list;
1643 struct net *net;
1644 struct nft_table *table;
1645 int msg_type;
1646 u32 seq;
1647 u16 flags;
1648 u8 report:1;
1649 u8 put_net:1;
1650 };
1651
1652 /**
1653 * struct nft_trans_binding - nf_tables object with binding support in transaction
1654 * @nft_trans: base structure, MUST be first member
1655 * @binding_list: list of objects with possible bindings
1656 *
1657 * This is the base type used by objects that can be bound to a chain.
1658 */
1659 struct nft_trans_binding {
1660 struct nft_trans nft_trans;
1661 struct list_head binding_list;
1662 };
1663
1664 struct nft_trans_rule {
1665 struct nft_trans nft_trans;
1666 struct nft_rule *rule;
1667 struct nft_chain *chain;
1668 struct nft_flow_rule *flow;
1669 u32 rule_id;
1670 bool bound;
1671 };
1672
1673 #define nft_trans_container_rule(trans) \
1674 container_of(trans, struct nft_trans_rule, nft_trans)
1675 #define nft_trans_rule(trans) \
1676 nft_trans_container_rule(trans)->rule
1677 #define nft_trans_flow_rule(trans) \
1678 nft_trans_container_rule(trans)->flow
1679 #define nft_trans_rule_id(trans) \
1680 nft_trans_container_rule(trans)->rule_id
1681 #define nft_trans_rule_bound(trans) \
1682 nft_trans_container_rule(trans)->bound
1683 #define nft_trans_rule_chain(trans) \
1684 nft_trans_container_rule(trans)->chain
1685
1686 struct nft_trans_set {
1687 struct nft_trans_binding nft_trans_binding;
1688 struct list_head list_trans_newset;
1689 struct nft_set *set;
1690 u32 set_id;
1691 u32 gc_int;
1692 u64 timeout;
1693 bool update;
1694 bool bound;
1695 u32 size;
1696 };
1697
1698 #define nft_trans_container_set(t) \
1699 container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
1700 #define nft_trans_set(trans) \
1701 nft_trans_container_set(trans)->set
1702 #define nft_trans_set_id(trans) \
1703 nft_trans_container_set(trans)->set_id
1704 #define nft_trans_set_bound(trans) \
1705 nft_trans_container_set(trans)->bound
1706 #define nft_trans_set_update(trans) \
1707 nft_trans_container_set(trans)->update
1708 #define nft_trans_set_timeout(trans) \
1709 nft_trans_container_set(trans)->timeout
1710 #define nft_trans_set_gc_int(trans) \
1711 nft_trans_container_set(trans)->gc_int
1712 #define nft_trans_set_size(trans) \
1713 nft_trans_container_set(trans)->size
1714
1715 struct nft_trans_chain {
1716 struct nft_trans_binding nft_trans_binding;
1717 struct nft_chain *chain;
1718 char *name;
1719 struct nft_stats __percpu *stats;
1720 u8 policy;
1721 bool update;
1722 bool bound;
1723 u32 chain_id;
1724 struct nft_base_chain *basechain;
1725 struct list_head hook_list;
1726 };
1727
1728 #define nft_trans_container_chain(t) \
1729 container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
1730 #define nft_trans_chain(trans) \
1731 nft_trans_container_chain(trans)->chain
1732 #define nft_trans_chain_update(trans) \
1733 nft_trans_container_chain(trans)->update
1734 #define nft_trans_chain_name(trans) \
1735 nft_trans_container_chain(trans)->name
1736 #define nft_trans_chain_stats(trans) \
1737 nft_trans_container_chain(trans)->stats
1738 #define nft_trans_chain_policy(trans) \
1739 nft_trans_container_chain(trans)->policy
1740 #define nft_trans_chain_bound(trans) \
1741 nft_trans_container_chain(trans)->bound
1742 #define nft_trans_chain_id(trans) \
1743 nft_trans_container_chain(trans)->chain_id
1744 #define nft_trans_basechain(trans) \
1745 nft_trans_container_chain(trans)->basechain
1746 #define nft_trans_chain_hooks(trans) \
1747 nft_trans_container_chain(trans)->hook_list
1748
1749 struct nft_trans_table {
1750 struct nft_trans nft_trans;
1751 bool update;
1752 };
1753
1754 #define nft_trans_container_table(trans) \
1755 container_of(trans, struct nft_trans_table, nft_trans)
1756 #define nft_trans_table_update(trans) \
1757 nft_trans_container_table(trans)->update
1758
1759 enum nft_trans_elem_flags {
1760 NFT_TRANS_UPD_TIMEOUT = (1 << 0),
1761 NFT_TRANS_UPD_EXPIRATION = (1 << 1),
1762 };
1763
1764 struct nft_trans_elem {
1765 struct nft_trans nft_trans;
1766 struct nft_set *set;
1767 struct nft_elem_priv *elem_priv;
1768 u64 timeout;
1769 u64 expiration;
1770 u8 update_flags;
1771 bool bound;
1772 };
1773
1774 #define nft_trans_container_elem(t) \
1775 container_of(t, struct nft_trans_elem, nft_trans)
1776 #define nft_trans_elem_set(trans) \
1777 nft_trans_container_elem(trans)->set
1778 #define nft_trans_elem_priv(trans) \
1779 nft_trans_container_elem(trans)->elem_priv
1780 #define nft_trans_elem_update_flags(trans) \
1781 nft_trans_container_elem(trans)->update_flags
1782 #define nft_trans_elem_timeout(trans) \
1783 nft_trans_container_elem(trans)->timeout
1784 #define nft_trans_elem_expiration(trans) \
1785 nft_trans_container_elem(trans)->expiration
1786 #define nft_trans_elem_set_bound(trans) \
1787 nft_trans_container_elem(trans)->bound
1788
1789 struct nft_trans_obj {
1790 struct nft_trans nft_trans;
1791 struct nft_object *obj;
1792 struct nft_object *newobj;
1793 bool update;
1794 };
1795
1796 #define nft_trans_container_obj(t) \
1797 container_of(t, struct nft_trans_obj, nft_trans)
1798 #define nft_trans_obj(trans) \
1799 nft_trans_container_obj(trans)->obj
1800 #define nft_trans_obj_newobj(trans) \
1801 nft_trans_container_obj(trans)->newobj
1802 #define nft_trans_obj_update(trans) \
1803 nft_trans_container_obj(trans)->update
1804
1805 struct nft_trans_flowtable {
1806 struct nft_trans nft_trans;
1807 struct nft_flowtable *flowtable;
1808 struct list_head hook_list;
1809 u32 flags;
1810 bool update;
1811 };
1812
1813 #define nft_trans_container_flowtable(t) \
1814 container_of(t, struct nft_trans_flowtable, nft_trans)
1815 #define nft_trans_flowtable(trans) \
1816 nft_trans_container_flowtable(trans)->flowtable
1817 #define nft_trans_flowtable_update(trans) \
1818 nft_trans_container_flowtable(trans)->update
1819 #define nft_trans_flowtable_hooks(trans) \
1820 nft_trans_container_flowtable(trans)->hook_list
1821 #define nft_trans_flowtable_flags(trans) \
1822 nft_trans_container_flowtable(trans)->flags
1823
1824 #define NFT_TRANS_GC_BATCHCOUNT 256
1825
1826 struct nft_trans_gc {
1827 struct list_head list;
1828 struct net *net;
1829 struct nft_set *set;
1830 u32 seq;
1831 u16 count;
1832 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
1833 struct rcu_head rcu;
1834 };
1835
nft_ctx_update(struct nft_ctx * ctx,const struct nft_trans * trans)1836 static inline void nft_ctx_update(struct nft_ctx *ctx,
1837 const struct nft_trans *trans)
1838 {
1839 switch (trans->msg_type) {
1840 case NFT_MSG_NEWRULE:
1841 case NFT_MSG_DELRULE:
1842 case NFT_MSG_DESTROYRULE:
1843 ctx->chain = nft_trans_rule_chain(trans);
1844 break;
1845 case NFT_MSG_NEWCHAIN:
1846 case NFT_MSG_DELCHAIN:
1847 case NFT_MSG_DESTROYCHAIN:
1848 ctx->chain = nft_trans_chain(trans);
1849 break;
1850 default:
1851 ctx->chain = NULL;
1852 break;
1853 }
1854
1855 ctx->net = trans->net;
1856 ctx->table = trans->table;
1857 ctx->family = trans->table->family;
1858 ctx->report = trans->report;
1859 ctx->flags = trans->flags;
1860 ctx->seq = trans->seq;
1861 }
1862
1863 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
1864 unsigned int gc_seq, gfp_t gfp);
1865 void nft_trans_gc_destroy(struct nft_trans_gc *trans);
1866
1867 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
1868 unsigned int gc_seq, gfp_t gfp);
1869 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
1870
1871 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
1872 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
1873
1874 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
1875
1876 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
1877 unsigned int gc_seq);
1878 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
1879
1880 void nft_setelem_data_deactivate(const struct net *net,
1881 const struct nft_set *set,
1882 struct nft_elem_priv *elem_priv);
1883
1884 int __init nft_chain_filter_init(void);
1885 void nft_chain_filter_fini(void);
1886
1887 void __init nft_chain_route_init(void);
1888 void nft_chain_route_fini(void);
1889
1890 void nf_tables_trans_destroy_flush_work(struct net *net);
1891
1892 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1893 __be64 nf_jiffies64_to_msecs(u64 input);
1894
1895 #ifdef CONFIG_MODULES
1896 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1897 #else
nft_request_module(struct net * net,const char * fmt,...)1898 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1899 #endif
1900
1901 struct nftables_pernet {
1902 struct list_head tables;
1903 struct list_head commit_list;
1904 struct list_head destroy_list;
1905 struct list_head commit_set_list;
1906 struct list_head binding_list;
1907 struct list_head module_list;
1908 struct list_head notify_list;
1909 struct mutex commit_mutex;
1910 u64 table_handle;
1911 u64 tstamp;
1912 unsigned int gc_seq;
1913 u8 validate_state;
1914 struct work_struct destroy_work;
1915 };
1916
1917 extern unsigned int nf_tables_net_id;
1918
nft_pernet(const struct net * net)1919 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1920 {
1921 return net_generic(net, nf_tables_net_id);
1922 }
1923
nft_net_tstamp(const struct net * net)1924 static inline u64 nft_net_tstamp(const struct net *net)
1925 {
1926 return nft_pernet(net)->tstamp;
1927 }
1928
1929 #define __NFT_REDUCE_READONLY 1UL
1930 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY
1931
nft_reduce_is_readonly(const struct nft_expr * expr)1932 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr)
1933 {
1934 return expr->ops->reduce == NFT_REDUCE_READONLY;
1935 }
1936
1937 void nft_reg_track_update(struct nft_regs_track *track,
1938 const struct nft_expr *expr, u8 dreg, u8 len);
1939 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len);
1940 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg);
1941
nft_reg_track_cmp(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg)1942 static inline bool nft_reg_track_cmp(struct nft_regs_track *track,
1943 const struct nft_expr *expr, u8 dreg)
1944 {
1945 return track->regs[dreg].selector &&
1946 track->regs[dreg].selector->ops == expr->ops &&
1947 track->regs[dreg].num_reg == 0;
1948 }
1949
1950 #endif /* _NET_NF_TABLES_H */
1951