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