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/nf_tables.h>
10 #include <linux/u64_stats_sync.h>
11 #include <linux/rhashtable.h>
12 #include <net/netfilter/nf_flow_table.h>
13 #include <net/netlink.h>
14 #include <net/flow_offload.h>
15 #include <net/netns/generic.h>
16
17 #define NFT_MAX_HOOKS (NF_INET_INGRESS + 1)
18
19 struct module;
20
21 #define NFT_JUMP_STACK_SIZE 16
22
23 enum {
24 NFT_PKTINFO_L4PROTO = (1 << 0),
25 NFT_PKTINFO_INNER = (1 << 1),
26 NFT_PKTINFO_INNER_FULL = (1 << 2),
27 };
28
29 struct nft_pktinfo {
30 struct sk_buff *skb;
31 const struct nf_hook_state *state;
32 u8 flags;
33 u8 tprot;
34 u16 fragoff;
35 u16 thoff;
36 u16 inneroff;
37 };
38
nft_sk(const struct nft_pktinfo * pkt)39 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
40 {
41 return pkt->state->sk;
42 }
43
nft_thoff(const struct nft_pktinfo * pkt)44 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
45 {
46 return pkt->thoff;
47 }
48
nft_net(const struct nft_pktinfo * pkt)49 static inline struct net *nft_net(const struct nft_pktinfo *pkt)
50 {
51 return pkt->state->net;
52 }
53
nft_hook(const struct nft_pktinfo * pkt)54 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt)
55 {
56 return pkt->state->hook;
57 }
58
nft_pf(const struct nft_pktinfo * pkt)59 static inline u8 nft_pf(const struct nft_pktinfo *pkt)
60 {
61 return pkt->state->pf;
62 }
63
nft_in(const struct nft_pktinfo * pkt)64 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt)
65 {
66 return pkt->state->in;
67 }
68
nft_out(const struct nft_pktinfo * pkt)69 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt)
70 {
71 return pkt->state->out;
72 }
73
nft_set_pktinfo(struct nft_pktinfo * pkt,struct sk_buff * skb,const struct nf_hook_state * state)74 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
75 struct sk_buff *skb,
76 const struct nf_hook_state *state)
77 {
78 pkt->skb = skb;
79 pkt->state = state;
80 }
81
nft_set_pktinfo_unspec(struct nft_pktinfo * pkt)82 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt)
83 {
84 pkt->flags = 0;
85 pkt->tprot = 0;
86 pkt->thoff = 0;
87 pkt->fragoff = 0;
88 }
89
90 /**
91 * struct nft_verdict - nf_tables verdict
92 *
93 * @code: nf_tables/netfilter verdict code
94 * @chain: destination chain for NFT_JUMP/NFT_GOTO
95 */
96 struct nft_verdict {
97 u32 code;
98 struct nft_chain *chain;
99 };
100
101 struct nft_data {
102 union {
103 u32 data[4];
104 struct nft_verdict verdict;
105 };
106 } __attribute__((aligned(__alignof__(u64))));
107
108 #define NFT_REG32_NUM 20
109
110 /**
111 * struct nft_regs - nf_tables register set
112 *
113 * @data: data registers
114 * @verdict: verdict register
115 *
116 * The first four data registers alias to the verdict register.
117 */
118 struct nft_regs {
119 union {
120 u32 data[NFT_REG32_NUM];
121 struct nft_verdict verdict;
122 };
123 };
124
125 struct nft_regs_track {
126 struct {
127 const struct nft_expr *selector;
128 const struct nft_expr *bitwise;
129 u8 num_reg;
130 } regs[NFT_REG32_NUM];
131
132 const struct nft_expr *cur;
133 const struct nft_expr *last;
134 };
135
136 /* Store/load an u8, u16 or u64 integer to/from the u32 data register.
137 *
138 * Note, when using concatenations, register allocation happens at 32-bit
139 * level. So for store instruction, pad the rest part with zero to avoid
140 * garbage values.
141 */
142
nft_reg_store8(u32 * dreg,u8 val)143 static inline void nft_reg_store8(u32 *dreg, u8 val)
144 {
145 *dreg = 0;
146 *(u8 *)dreg = val;
147 }
148
nft_reg_load8(const u32 * sreg)149 static inline u8 nft_reg_load8(const u32 *sreg)
150 {
151 return *(u8 *)sreg;
152 }
153
nft_reg_store16(u32 * dreg,u16 val)154 static inline void nft_reg_store16(u32 *dreg, u16 val)
155 {
156 *dreg = 0;
157 *(u16 *)dreg = val;
158 }
159
nft_reg_store_be16(u32 * dreg,__be16 val)160 static inline void nft_reg_store_be16(u32 *dreg, __be16 val)
161 {
162 nft_reg_store16(dreg, (__force __u16)val);
163 }
164
nft_reg_load16(const u32 * sreg)165 static inline u16 nft_reg_load16(const u32 *sreg)
166 {
167 return *(u16 *)sreg;
168 }
169
nft_reg_load_be16(const u32 * sreg)170 static inline __be16 nft_reg_load_be16(const u32 *sreg)
171 {
172 return (__force __be16)nft_reg_load16(sreg);
173 }
174
nft_reg_load_be32(const u32 * sreg)175 static inline __be32 nft_reg_load_be32(const u32 *sreg)
176 {
177 return *(__force __be32 *)sreg;
178 }
179
nft_reg_store64(u64 * dreg,u64 val)180 static inline void nft_reg_store64(u64 *dreg, u64 val)
181 {
182 put_unaligned(val, dreg);
183 }
184
nft_reg_load64(const u32 * sreg)185 static inline u64 nft_reg_load64(const u32 *sreg)
186 {
187 return get_unaligned((u64 *)sreg);
188 }
189
nft_data_copy(u32 * dst,const struct nft_data * src,unsigned int len)190 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
191 unsigned int len)
192 {
193 if (len % NFT_REG32_SIZE)
194 dst[len / NFT_REG32_SIZE] = 0;
195 memcpy(dst, src, len);
196 }
197
198 /**
199 * struct nft_ctx - nf_tables rule/set context
200 *
201 * @net: net namespace
202 * @table: the table the chain is contained in
203 * @chain: the chain the rule is contained in
204 * @nla: netlink attributes
205 * @portid: netlink portID of the original message
206 * @seq: netlink sequence number
207 * @flags: modifiers to new request
208 * @family: protocol family
209 * @level: depth of the chains
210 * @report: notify via unicast netlink message
211 * @reg_inited: bitmap of initialised registers
212 */
213 struct nft_ctx {
214 struct net *net;
215 struct nft_table *table;
216 struct nft_chain *chain;
217 const struct nlattr * const *nla;
218 u32 portid;
219 u32 seq;
220 u16 flags;
221 u8 family;
222 u8 level;
223 bool report;
224 DECLARE_BITMAP(reg_inited, NFT_REG32_NUM);
225 };
226
227 enum nft_data_desc_flags {
228 NFT_DATA_DESC_SETELEM = (1 << 0),
229 };
230
231 struct nft_data_desc {
232 enum nft_data_types type;
233 unsigned int size;
234 unsigned int len;
235 unsigned int flags;
236 };
237
238 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
239 struct nft_data_desc *desc, const struct nlattr *nla);
240 void nft_data_hold(const struct nft_data *data, enum nft_data_types type);
241 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
242 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
243 enum nft_data_types type, unsigned int len);
244
nft_dreg_to_type(enum nft_registers reg)245 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
246 {
247 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
248 }
249
nft_type_to_reg(enum nft_data_types type)250 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
251 {
252 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
253 }
254
255 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
256 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
257
258 int nft_parse_register_load(const struct nft_ctx *ctx,
259 const struct nlattr *attr, u8 *sreg, u32 len);
260 int nft_parse_register_store(const struct nft_ctx *ctx,
261 const struct nlattr *attr, u8 *dreg,
262 const struct nft_data *data,
263 enum nft_data_types type, unsigned int len);
264
265 /**
266 * struct nft_userdata - user defined data associated with an object
267 *
268 * @len: length of the data
269 * @data: content
270 *
271 * The presence of user data is indicated in an object specific fashion,
272 * so a length of zero can't occur and the value "len" indicates data
273 * of length len + 1.
274 */
275 struct nft_userdata {
276 u8 len;
277 unsigned char data[];
278 };
279
280 /* placeholder structure for opaque set element backend representation. */
281 struct nft_elem_priv { };
282
283 /**
284 * struct nft_set_elem - generic representation of set elements
285 *
286 * @key: element key
287 * @key_end: closing element key
288 * @data: element data
289 * @priv: element private data and extensions
290 */
291 struct nft_set_elem {
292 union {
293 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
294 struct nft_data val;
295 } key;
296 union {
297 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
298 struct nft_data val;
299 } key_end;
300 union {
301 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
302 struct nft_data val;
303 } data;
304 struct nft_elem_priv *priv;
305 };
306
nft_elem_priv_cast(const struct nft_elem_priv * priv)307 static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv)
308 {
309 return (void *)priv;
310 }
311
312
313 /**
314 * enum nft_iter_type - nftables set iterator type
315 *
316 * @NFT_ITER_UNSPEC: unspecified, to catch errors
317 * @NFT_ITER_READ: read-only iteration over set elements
318 * @NFT_ITER_UPDATE: iteration under mutex to update set element state
319 * @NFT_ITER_UPDATE_CLONE: clone set before iteration under mutex to update element
320 */
321 enum nft_iter_type {
322 NFT_ITER_UNSPEC,
323 NFT_ITER_READ,
324 NFT_ITER_UPDATE,
325 NFT_ITER_UPDATE_CLONE,
326 };
327
328 struct nft_set;
329 struct nft_set_iter {
330 u8 genmask;
331 enum nft_iter_type type:8;
332 unsigned int count;
333 unsigned int skip;
334 int err;
335 int (*fn)(const struct nft_ctx *ctx,
336 struct nft_set *set,
337 const struct nft_set_iter *iter,
338 struct nft_elem_priv *elem_priv);
339 };
340
341 /**
342 * struct nft_set_desc - description of set elements
343 *
344 * @ktype: key type
345 * @klen: key length
346 * @dtype: data type
347 * @dlen: data length
348 * @objtype: object type
349 * @size: number of set elements
350 * @policy: set policy
351 * @gc_int: garbage collector interval
352 * @timeout: element timeout
353 * @field_len: length of each field in concatenation, bytes
354 * @field_count: number of concatenated fields in element
355 * @expr: set must support for expressions
356 */
357 struct nft_set_desc {
358 u32 ktype;
359 unsigned int klen;
360 u32 dtype;
361 unsigned int dlen;
362 u32 objtype;
363 unsigned int size;
364 u32 policy;
365 u32 gc_int;
366 u64 timeout;
367 u8 field_len[NFT_REG32_COUNT];
368 u8 field_count;
369 bool expr;
370 };
371
372 /**
373 * enum nft_set_class - performance class
374 *
375 * @NFT_SET_CLASS_O_1: constant, O(1)
376 * @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N)
377 * @NFT_SET_CLASS_O_N: linear, O(N)
378 */
379 enum nft_set_class {
380 NFT_SET_CLASS_O_1,
381 NFT_SET_CLASS_O_LOG_N,
382 NFT_SET_CLASS_O_N,
383 };
384
385 /**
386 * struct nft_set_estimate - estimation of memory and performance
387 * characteristics
388 *
389 * @size: required memory
390 * @lookup: lookup performance class
391 * @space: memory class
392 */
393 struct nft_set_estimate {
394 u64 size;
395 enum nft_set_class lookup;
396 enum nft_set_class space;
397 };
398
399 #define NFT_EXPR_MAXATTR 16
400 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
401 ALIGN(size, __alignof__(struct nft_expr)))
402
403 /**
404 * struct nft_expr - nf_tables expression
405 *
406 * @ops: expression ops
407 * @data: expression private data
408 */
409 struct nft_expr {
410 const struct nft_expr_ops *ops;
411 unsigned char data[]
412 __attribute__((aligned(__alignof__(u64))));
413 };
414
nft_expr_priv(const struct nft_expr * expr)415 static inline void *nft_expr_priv(const struct nft_expr *expr)
416 {
417 return (void *)expr->data;
418 }
419
420 struct nft_expr_info;
421
422 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla,
423 struct nft_expr_info *info);
424 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src, gfp_t gfp);
425 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
426 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
427 const struct nft_expr *expr, bool reset);
428 bool nft_expr_reduce_bitwise(struct nft_regs_track *track,
429 const struct nft_expr *expr);
430
431 struct nft_set_ext;
432
433 /**
434 * struct nft_set_ops - nf_tables set operations
435 *
436 * @lookup: look up an element within the set
437 * @update: update an element if exists, add it if doesn't exist
438 * @delete: delete an element
439 * @insert: insert new element into set
440 * @activate: activate new element in the next generation
441 * @deactivate: lookup for element and deactivate it in the next generation
442 * @flush: deactivate element in the next generation
443 * @remove: remove element from set
444 * @walk: iterate over all set elements
445 * @get: get set elements
446 * @ksize: kernel set size
447 * @usize: userspace set size
448 * @adjust_maxsize: delta to adjust maximum set size
449 * @commit: commit set elements
450 * @abort: abort set elements
451 * @privsize: function to return size of set private data
452 * @estimate: estimate the required memory size and the lookup complexity class
453 * @init: initialize private data of new set instance
454 * @destroy: destroy private data of set instance
455 * @gc_init: initialize garbage collection
456 * @abort_skip_removal: skip removal of elements from abort path
457 * @elemsize: element private size
458 *
459 * Operations lookup, update and delete have simpler interfaces, are faster
460 * and currently only used in the packet path. All the rest are slower,
461 * control plane functions.
462 */
463 struct nft_set_ops {
464 const struct nft_set_ext * (*lookup)(const struct net *net,
465 const struct nft_set *set,
466 const u32 *key);
467 const struct nft_set_ext * (*update)(struct nft_set *set,
468 const u32 *key,
469 const struct nft_expr *expr,
470 struct nft_regs *regs);
471 bool (*delete)(const struct nft_set *set,
472 const u32 *key);
473
474 int (*insert)(const struct net *net,
475 const struct nft_set *set,
476 const struct nft_set_elem *elem,
477 struct nft_elem_priv **priv);
478 void (*activate)(const struct net *net,
479 const struct nft_set *set,
480 struct nft_elem_priv *elem_priv);
481 struct nft_elem_priv * (*deactivate)(const struct net *net,
482 const struct nft_set *set,
483 const struct nft_set_elem *elem);
484 void (*flush)(const struct net *net,
485 const struct nft_set *set,
486 struct nft_elem_priv *priv);
487 void (*remove)(const struct net *net,
488 const struct nft_set *set,
489 struct nft_elem_priv *elem_priv);
490 void (*walk)(const struct nft_ctx *ctx,
491 struct nft_set *set,
492 struct nft_set_iter *iter);
493 struct nft_elem_priv * (*get)(const struct net *net,
494 const struct nft_set *set,
495 const struct nft_set_elem *elem,
496 unsigned int flags);
497 u32 (*ksize)(u32 size);
498 u32 (*usize)(u32 size);
499 u32 (*adjust_maxsize)(const struct nft_set *set);
500 void (*commit)(struct nft_set *set);
501 void (*abort)(const struct nft_set *set);
502 u64 (*privsize)(const struct nlattr * const nla[],
503 const struct nft_set_desc *desc);
504 bool (*estimate)(const struct nft_set_desc *desc,
505 u32 features,
506 struct nft_set_estimate *est);
507 int (*init)(const struct nft_set *set,
508 const struct nft_set_desc *desc,
509 const struct nlattr * const nla[]);
510 void (*destroy)(const struct nft_ctx *ctx,
511 const struct nft_set *set);
512 void (*gc_init)(const struct nft_set *set);
513
514 bool abort_skip_removal;
515 unsigned int elemsize;
516 };
517
518 /**
519 * struct nft_set_type - nf_tables set type
520 *
521 * @ops: set ops for this type
522 * @features: features supported by the implementation
523 */
524 struct nft_set_type {
525 const struct nft_set_ops ops;
526 u32 features;
527 };
528 #define to_set_type(o) container_of(o, struct nft_set_type, ops)
529
530 struct nft_set_elem_expr {
531 u8 size;
532 unsigned char data[]
533 __attribute__((aligned(__alignof__(struct nft_expr))));
534 };
535
536 #define nft_setelem_expr_at(__elem_expr, __offset) \
537 ((struct nft_expr *)&__elem_expr->data[__offset])
538
539 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \
540 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \
541 __size < (__elem_expr)->size; \
542 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size)
543
544 #define NFT_SET_EXPR_MAX 2
545
546 /**
547 * struct nft_set - nf_tables set instance
548 *
549 * @list: table set list node
550 * @bindings: list of set bindings
551 * @refs: internal refcounting for async set destruction
552 * @table: table this set belongs to
553 * @net: netnamespace this set belongs to
554 * @name: name of the set
555 * @handle: unique handle of the set
556 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
557 * @dtype: data type (verdict or numeric type defined by userspace)
558 * @objtype: object type (see NFT_OBJECT_* definitions)
559 * @size: maximum set size
560 * @field_len: length of each field in concatenation, bytes
561 * @field_count: number of concatenated fields in element
562 * @in_update_walk: true during ->walk() in transaction phase
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 bool in_update_walk;
598 u32 use;
599 atomic_t nelems;
600 u32 ndeact;
601 u64 timeout;
602 u32 gc_int;
603 u16 policy;
604 u16 udlen;
605 unsigned char *udata;
606 struct list_head pending_update;
607 /* runtime data below here */
608 const struct nft_set_ops *ops ____cacheline_aligned;
609 u16 flags:13,
610 dead:1,
611 genmask:2;
612 u8 klen;
613 u8 dlen;
614 u8 num_exprs;
615 struct nft_expr *exprs[NFT_SET_EXPR_MAX];
616 struct list_head catchall_list;
617 unsigned char data[]
618 __attribute__((aligned(__alignof__(u64))));
619 };
620
nft_set_is_anonymous(const struct nft_set * set)621 static inline bool nft_set_is_anonymous(const struct nft_set *set)
622 {
623 return set->flags & NFT_SET_ANONYMOUS;
624 }
625
nft_set_priv(const struct nft_set * set)626 static inline void *nft_set_priv(const struct nft_set *set)
627 {
628 return (void *)set->data;
629 }
630
nft_set_datatype(const struct nft_set * set)631 static inline enum nft_data_types nft_set_datatype(const struct nft_set *set)
632 {
633 return set->dtype == NFT_DATA_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
634 }
635
nft_set_gc_is_pending(const struct nft_set * s)636 static inline bool nft_set_gc_is_pending(const struct nft_set *s)
637 {
638 return refcount_read(&s->refs) != 1;
639 }
640
nft_set_container_of(const void * priv)641 static inline struct nft_set *nft_set_container_of(const void *priv)
642 {
643 return (void *)priv - offsetof(struct nft_set, data);
644 }
645
646 struct nft_set *nft_set_lookup_global(const struct net *net,
647 const struct nft_table *table,
648 const struct nlattr *nla_set_name,
649 const struct nlattr *nla_set_id,
650 u8 genmask);
651
652 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net,
653 const struct nft_set *set);
654
nft_set_gc_interval(const struct nft_set * set)655 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
656 {
657 u32 gc_int = READ_ONCE(set->gc_int);
658
659 return gc_int ? msecs_to_jiffies(gc_int) : HZ;
660 }
661
662 /**
663 * struct nft_set_binding - nf_tables set binding
664 *
665 * @list: set bindings list node
666 * @chain: chain containing the rule bound to the set
667 * @flags: set action flags
668 *
669 * A set binding contains all information necessary for validation
670 * of new elements added to a bound set.
671 */
672 struct nft_set_binding {
673 struct list_head list;
674 const struct nft_chain *chain;
675 u32 flags;
676 };
677
678 enum nft_trans_phase;
679 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
680 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
681 struct nft_set_binding *binding,
682 enum nft_trans_phase phase);
683 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
684 struct nft_set_binding *binding);
685 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set);
686
687 /**
688 * enum nft_set_extensions - set extension type IDs
689 *
690 * @NFT_SET_EXT_KEY: element key
691 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges
692 * @NFT_SET_EXT_DATA: mapping data
693 * @NFT_SET_EXT_FLAGS: element flags
694 * @NFT_SET_EXT_TIMEOUT: element timeout
695 * @NFT_SET_EXT_USERDATA: user data associated with the element
696 * @NFT_SET_EXT_EXPRESSIONS: expressions associated with the element
697 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
698 * @NFT_SET_EXT_NUM: number of extension types
699 */
700 enum nft_set_extensions {
701 NFT_SET_EXT_KEY,
702 NFT_SET_EXT_KEY_END,
703 NFT_SET_EXT_DATA,
704 NFT_SET_EXT_FLAGS,
705 NFT_SET_EXT_TIMEOUT,
706 NFT_SET_EXT_USERDATA,
707 NFT_SET_EXT_EXPRESSIONS,
708 NFT_SET_EXT_OBJREF,
709 NFT_SET_EXT_NUM
710 };
711
712 /**
713 * struct nft_set_ext_type - set extension type
714 *
715 * @len: fixed part length of the extension
716 * @align: alignment requirements of the extension
717 */
718 struct nft_set_ext_type {
719 u8 len;
720 u8 align;
721 };
722
723 extern const struct nft_set_ext_type nft_set_ext_types[];
724
725 /**
726 * struct nft_set_ext_tmpl - set extension template
727 *
728 * @len: length of extension area
729 * @offset: offsets of individual extension types
730 * @ext_len: length of the expected extension(used to sanity check)
731 */
732 struct nft_set_ext_tmpl {
733 u16 len;
734 u8 offset[NFT_SET_EXT_NUM];
735 u8 ext_len[NFT_SET_EXT_NUM];
736 };
737
738 /**
739 * struct nft_set_ext - set extensions
740 *
741 * @genmask: generation mask, but also flags (see NFT_SET_ELEM_DEAD_BIT)
742 * @offset: offsets of individual extension types
743 * @data: beginning of extension data
744 *
745 * This structure must be aligned to word size, otherwise atomic bitops
746 * on genmask field can cause alignment failure on some archs.
747 */
748 struct nft_set_ext {
749 u8 genmask;
750 u8 offset[NFT_SET_EXT_NUM];
751 char data[];
752 } __aligned(BITS_PER_LONG / 8);
753
nft_set_ext_prepare(struct nft_set_ext_tmpl * tmpl)754 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
755 {
756 memset(tmpl, 0, sizeof(*tmpl));
757 tmpl->len = sizeof(struct nft_set_ext);
758 }
759
nft_set_ext_add_length(struct nft_set_ext_tmpl * tmpl,u8 id,unsigned int len)760 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
761 unsigned int len)
762 {
763 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
764 if (tmpl->len > U8_MAX)
765 return -EINVAL;
766
767 tmpl->offset[id] = tmpl->len;
768 tmpl->ext_len[id] = nft_set_ext_types[id].len + len;
769 tmpl->len += tmpl->ext_len[id];
770
771 return 0;
772 }
773
nft_set_ext_add(struct nft_set_ext_tmpl * tmpl,u8 id)774 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
775 {
776 return nft_set_ext_add_length(tmpl, id, 0);
777 }
778
nft_set_ext_init(struct nft_set_ext * ext,const struct nft_set_ext_tmpl * tmpl)779 static inline void nft_set_ext_init(struct nft_set_ext *ext,
780 const struct nft_set_ext_tmpl *tmpl)
781 {
782 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
783 }
784
__nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)785 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
786 {
787 return !!ext->offset[id];
788 }
789
nft_set_ext_exists(const struct nft_set_ext * ext,u8 id)790 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
791 {
792 return ext && __nft_set_ext_exists(ext, id);
793 }
794
nft_set_ext(const struct nft_set_ext * ext,u8 id)795 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
796 {
797 return (void *)ext + ext->offset[id];
798 }
799
nft_set_ext_key(const struct nft_set_ext * ext)800 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
801 {
802 return nft_set_ext(ext, NFT_SET_EXT_KEY);
803 }
804
nft_set_ext_key_end(const struct nft_set_ext * ext)805 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext)
806 {
807 return nft_set_ext(ext, NFT_SET_EXT_KEY_END);
808 }
809
nft_set_ext_data(const struct nft_set_ext * ext)810 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
811 {
812 return nft_set_ext(ext, NFT_SET_EXT_DATA);
813 }
814
nft_set_ext_flags(const struct nft_set_ext * ext)815 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
816 {
817 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
818 }
819
820 struct nft_timeout {
821 u64 timeout;
822 u64 expiration;
823 };
824
nft_set_ext_timeout(const struct nft_set_ext * ext)825 static inline struct nft_timeout *nft_set_ext_timeout(const struct nft_set_ext *ext)
826 {
827 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
828 }
829
nft_set_ext_userdata(const struct nft_set_ext * ext)830 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
831 {
832 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
833 }
834
nft_set_ext_expr(const struct nft_set_ext * ext)835 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
836 {
837 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS);
838 }
839
__nft_set_elem_expired(const struct nft_set_ext * ext,u64 tstamp)840 static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext,
841 u64 tstamp)
842 {
843 if (!nft_set_ext_exists(ext, NFT_SET_EXT_TIMEOUT) ||
844 READ_ONCE(nft_set_ext_timeout(ext)->timeout) == 0)
845 return false;
846
847 return time_after_eq64(tstamp, READ_ONCE(nft_set_ext_timeout(ext)->expiration));
848 }
849
nft_set_elem_expired(const struct nft_set_ext * ext)850 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
851 {
852 return __nft_set_elem_expired(ext, get_jiffies_64());
853 }
854
nft_set_elem_ext(const struct nft_set * set,const struct nft_elem_priv * elem_priv)855 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
856 const struct nft_elem_priv *elem_priv)
857 {
858 return (void *)elem_priv + set->ops->elemsize;
859 }
860
nft_set_ext_obj(const struct nft_set_ext * ext)861 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
862 {
863 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
864 }
865
866 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx,
867 const struct nft_set *set,
868 const struct nlattr *attr);
869
870 struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set,
871 const struct nft_set_ext_tmpl *tmpl,
872 const u32 *key, const u32 *key_end,
873 const u32 *data,
874 u64 timeout, u64 expiration, gfp_t gfp);
875 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set,
876 struct nft_expr *expr_array[]);
877 void nft_set_elem_expr_destroy(const struct nft_ctx *ctx,
878 struct nft_set_elem_expr *elem_expr);
879 void nft_set_elem_destroy(const struct nft_set *set,
880 const struct nft_elem_priv *elem_priv,
881 bool destroy_expr);
882 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx,
883 const struct nft_set *set,
884 const struct nft_elem_priv *elem_priv);
885
886 struct nft_expr_ops;
887 /**
888 * struct nft_expr_type - nf_tables expression type
889 *
890 * @select_ops: function to select nft_expr_ops
891 * @release_ops: release nft_expr_ops
892 * @ops: default ops, used when no select_ops functions is present
893 * @inner_ops: inner ops, used for inner packet operation
894 * @list: used internally
895 * @name: Identifier
896 * @owner: module reference
897 * @policy: netlink attribute policy
898 * @maxattr: highest netlink attribute number
899 * @family: address family for AF-specific types
900 * @flags: expression type flags
901 */
902 struct nft_expr_type {
903 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
904 const struct nlattr * const tb[]);
905 void (*release_ops)(const struct nft_expr_ops *ops);
906 const struct nft_expr_ops *ops;
907 const struct nft_expr_ops *inner_ops;
908 struct list_head list;
909 const char *name;
910 struct module *owner;
911 const struct nla_policy *policy;
912 unsigned int maxattr;
913 u8 family;
914 u8 flags;
915 };
916
917 #define NFT_EXPR_STATEFUL 0x1
918 #define NFT_EXPR_GC 0x2
919
920 enum nft_trans_phase {
921 NFT_TRANS_PREPARE,
922 NFT_TRANS_PREPARE_ERROR,
923 NFT_TRANS_ABORT,
924 NFT_TRANS_COMMIT,
925 NFT_TRANS_RELEASE
926 };
927
928 struct nft_flow_rule;
929 struct nft_offload_ctx;
930
931 /**
932 * struct nft_expr_ops - nf_tables expression operations
933 *
934 * @eval: Expression evaluation function
935 * @clone: Expression clone function
936 * @size: full expression size, including private data size
937 * @init: initialization function
938 * @activate: activate expression in the next generation
939 * @deactivate: deactivate expression in next generation
940 * @destroy: destruction function, called after synchronize_rcu
941 * @destroy_clone: destruction clone function
942 * @dump: function to dump parameters
943 * @validate: validate expression, called during loop detection
944 * @reduce: reduce expression
945 * @gc: garbage collection expression
946 * @offload: hardware offload expression
947 * @offload_action: function to report true/false to allocate one slot or not in the flow
948 * offload array
949 * @offload_stats: function to synchronize hardware stats via updating the counter expression
950 * @type: expression type
951 * @data: extra data to attach to this expression operation
952 */
953 struct nft_expr_ops {
954 void (*eval)(const struct nft_expr *expr,
955 struct nft_regs *regs,
956 const struct nft_pktinfo *pkt);
957 int (*clone)(struct nft_expr *dst,
958 const struct nft_expr *src, gfp_t gfp);
959 unsigned int size;
960
961 int (*init)(const struct nft_ctx *ctx,
962 const struct nft_expr *expr,
963 const struct nlattr * const tb[]);
964 void (*activate)(const struct nft_ctx *ctx,
965 const struct nft_expr *expr);
966 void (*deactivate)(const struct nft_ctx *ctx,
967 const struct nft_expr *expr,
968 enum nft_trans_phase phase);
969 void (*destroy)(const struct nft_ctx *ctx,
970 const struct nft_expr *expr);
971 void (*destroy_clone)(const struct nft_ctx *ctx,
972 const struct nft_expr *expr);
973 int (*dump)(struct sk_buff *skb,
974 const struct nft_expr *expr,
975 bool reset);
976 int (*validate)(const struct nft_ctx *ctx,
977 const struct nft_expr *expr);
978 bool (*reduce)(struct nft_regs_track *track,
979 const struct nft_expr *expr);
980 bool (*gc)(struct net *net,
981 const struct nft_expr *expr);
982 int (*offload)(struct nft_offload_ctx *ctx,
983 struct nft_flow_rule *flow,
984 const struct nft_expr *expr);
985 bool (*offload_action)(const struct nft_expr *expr);
986 void (*offload_stats)(struct nft_expr *expr,
987 const struct flow_stats *stats);
988 const struct nft_expr_type *type;
989 void *data;
990 };
991
992 /**
993 * struct nft_rule - nf_tables rule
994 *
995 * @list: used internally
996 * @handle: rule handle
997 * @genmask: generation mask
998 * @dlen: length of expression data
999 * @udata: user data is appended to the rule
1000 * @data: expression data
1001 */
1002 struct nft_rule {
1003 struct list_head list;
1004 u64 handle:42,
1005 genmask:2,
1006 dlen:12,
1007 udata:1;
1008 unsigned char data[]
1009 __attribute__((aligned(__alignof__(struct nft_expr))));
1010 };
1011
nft_expr_first(const struct nft_rule * rule)1012 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
1013 {
1014 return (struct nft_expr *)&rule->data[0];
1015 }
1016
nft_expr_next(const struct nft_expr * expr)1017 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
1018 {
1019 return ((void *)expr) + expr->ops->size;
1020 }
1021
nft_expr_last(const struct nft_rule * rule)1022 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
1023 {
1024 return (struct nft_expr *)&rule->data[rule->dlen];
1025 }
1026
nft_expr_more(const struct nft_rule * rule,const struct nft_expr * expr)1027 static inline bool nft_expr_more(const struct nft_rule *rule,
1028 const struct nft_expr *expr)
1029 {
1030 return expr != nft_expr_last(rule) && expr->ops;
1031 }
1032
nft_userdata(const struct nft_rule * rule)1033 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
1034 {
1035 return (void *)&rule->data[rule->dlen];
1036 }
1037
1038 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule);
1039 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule,
1040 enum nft_trans_phase phase);
1041 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule);
1042
nft_set_elem_update_expr(const struct nft_set_ext * ext,struct nft_regs * regs,const struct nft_pktinfo * pkt)1043 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext,
1044 struct nft_regs *regs,
1045 const struct nft_pktinfo *pkt)
1046 {
1047 struct nft_set_elem_expr *elem_expr;
1048 struct nft_expr *expr;
1049 u32 size;
1050
1051 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) {
1052 elem_expr = nft_set_ext_expr(ext);
1053 nft_setelem_expr_foreach(expr, elem_expr, size) {
1054 expr->ops->eval(expr, regs, pkt);
1055 if (regs->verdict.code == NFT_BREAK)
1056 return;
1057 }
1058 }
1059 }
1060
1061 /*
1062 * The last pointer isn't really necessary, but the compiler isn't able to
1063 * determine that the result of nft_expr_last() is always the same since it
1064 * can't assume that the dlen value wasn't changed within calls in the loop.
1065 */
1066 #define nft_rule_for_each_expr(expr, last, rule) \
1067 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
1068 (expr) != (last); \
1069 (expr) = nft_expr_next(expr))
1070
1071 #define NFT_CHAIN_POLICY_UNSET U8_MAX
1072
1073 struct nft_rule_dp {
1074 u64 is_last:1,
1075 dlen:12,
1076 handle:42; /* for tracing */
1077 unsigned char data[]
1078 __attribute__((aligned(__alignof__(struct nft_expr))));
1079 };
1080
1081 struct nft_rule_dp_last {
1082 struct nft_rule_dp end; /* end of nft_rule_blob marker */
1083 struct rcu_head h; /* call_rcu head */
1084 struct nft_rule_blob *blob; /* ptr to free via call_rcu */
1085 const struct nft_chain *chain; /* for nftables tracing */
1086 };
1087
nft_rule_next(const struct nft_rule_dp * rule)1088 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule)
1089 {
1090 return (void *)rule + sizeof(*rule) + rule->dlen;
1091 }
1092
1093 struct nft_rule_blob {
1094 unsigned long size;
1095 unsigned char data[]
1096 __attribute__((aligned(__alignof__(struct nft_rule_dp))));
1097 };
1098
1099 enum nft_chain_types {
1100 NFT_CHAIN_T_DEFAULT = 0,
1101 NFT_CHAIN_T_ROUTE,
1102 NFT_CHAIN_T_NAT,
1103 NFT_CHAIN_T_MAX
1104 };
1105
1106 /**
1107 * struct nft_chain_validate_state - validation state
1108 *
1109 * If a chain is encountered again during table validation it is
1110 * possible to avoid revalidation provided the calling context is
1111 * compatible. This structure stores relevant calling context of
1112 * previous validations.
1113 *
1114 * @hook_mask: the hook numbers and locations the chain is linked to
1115 * @depth: the deepest call chain level the chain is linked to
1116 */
1117 struct nft_chain_validate_state {
1118 u8 hook_mask[NFT_CHAIN_T_MAX];
1119 u8 depth;
1120 };
1121
1122 /**
1123 * struct nft_chain - nf_tables chain
1124 *
1125 * @blob_gen_0: rule blob pointer to the current generation
1126 * @blob_gen_1: rule blob pointer to the future generation
1127 * @rules: list of rules in the chain
1128 * @list: used internally
1129 * @rhlhead: used internally
1130 * @table: table that this chain belongs to
1131 * @handle: chain handle
1132 * @use: number of jump references to this chain
1133 * @flags: bitmask of enum NFTA_CHAIN_FLAGS
1134 * @bound: bind or not
1135 * @genmask: generation mask
1136 * @name: name of the chain
1137 * @udlen: user data length
1138 * @udata: user data in the chain
1139 * @blob_next: rule blob pointer to the next in the chain
1140 * @vstate: validation state
1141 */
1142 struct nft_chain {
1143 struct nft_rule_blob __rcu *blob_gen_0;
1144 struct nft_rule_blob __rcu *blob_gen_1;
1145 struct list_head rules;
1146 struct list_head list;
1147 struct rhlist_head rhlhead;
1148 struct nft_table *table;
1149 u64 handle;
1150 u32 use;
1151 u8 flags:5,
1152 bound:1,
1153 genmask:2;
1154 char *name;
1155 u16 udlen;
1156 u8 *udata;
1157
1158 /* Only used during control plane commit phase: */
1159 struct nft_rule_blob *blob_next;
1160 struct nft_chain_validate_state vstate;
1161 };
1162
1163 int nft_chain_validate(const struct nft_ctx *ctx, struct nft_chain *chain);
1164 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set,
1165 const struct nft_set_iter *iter,
1166 struct nft_elem_priv *elem_priv);
1167 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set);
1168 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1169 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain);
1170
1171 /**
1172 * struct nft_chain_type - nf_tables chain type info
1173 *
1174 * @name: name of the type
1175 * @type: numeric identifier
1176 * @family: address family
1177 * @owner: module owner
1178 * @hook_mask: mask of valid hooks
1179 * @hooks: array of hook functions
1180 * @ops_register: base chain register function
1181 * @ops_unregister: base chain unregister function
1182 */
1183 struct nft_chain_type {
1184 const char *name;
1185 enum nft_chain_types type;
1186 int family;
1187 struct module *owner;
1188 unsigned int hook_mask;
1189 nf_hookfn *hooks[NFT_MAX_HOOKS];
1190 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops);
1191 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops);
1192 };
1193
1194 int nft_chain_validate_dependency(const struct nft_chain *chain,
1195 enum nft_chain_types type);
1196 int nft_chain_validate_hooks(const struct nft_chain *chain,
1197 unsigned int hook_flags);
1198
nft_chain_binding(const struct nft_chain * chain)1199 static inline bool nft_chain_binding(const struct nft_chain *chain)
1200 {
1201 return chain->flags & NFT_CHAIN_BINDING;
1202 }
1203
nft_chain_is_bound(struct nft_chain * chain)1204 static inline bool nft_chain_is_bound(struct nft_chain *chain)
1205 {
1206 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound;
1207 }
1208
1209 int nft_chain_add(struct nft_table *table, struct nft_chain *chain);
1210 void nft_chain_del(struct nft_chain *chain);
1211 void nf_tables_chain_destroy(struct nft_chain *chain);
1212
1213 struct nft_stats {
1214 u64 bytes;
1215 u64 pkts;
1216 struct u64_stats_sync syncp;
1217 };
1218
1219 struct nft_hook {
1220 struct list_head list;
1221 struct list_head ops_list;
1222 struct rcu_head rcu;
1223 char ifname[IFNAMSIZ];
1224 u8 ifnamelen;
1225 };
1226
1227 struct nf_hook_ops *nft_hook_find_ops(const struct nft_hook *hook,
1228 const struct net_device *dev);
1229 struct nf_hook_ops *nft_hook_find_ops_rcu(const struct nft_hook *hook,
1230 const struct net_device *dev);
1231
1232 /**
1233 * struct nft_base_chain - nf_tables base chain
1234 *
1235 * @ops: netfilter hook ops
1236 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family)
1237 * @type: chain type
1238 * @policy: default policy
1239 * @flags: indicate the base chain disabled or not
1240 * @stats: per-cpu chain stats
1241 * @chain: the chain
1242 * @flow_block: flow block (for hardware offload)
1243 */
1244 struct nft_base_chain {
1245 struct nf_hook_ops ops;
1246 struct list_head hook_list;
1247 const struct nft_chain_type *type;
1248 u8 policy;
1249 u8 flags;
1250 struct nft_stats __percpu *stats;
1251 struct nft_chain chain;
1252 struct flow_block flow_block;
1253 };
1254
nft_base_chain(const struct nft_chain * chain)1255 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
1256 {
1257 return container_of(chain, struct nft_base_chain, chain);
1258 }
1259
nft_is_base_chain(const struct nft_chain * chain)1260 static inline bool nft_is_base_chain(const struct nft_chain *chain)
1261 {
1262 return chain->flags & NFT_CHAIN_BASE;
1263 }
1264
1265 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
1266
nft_use_inc(u32 * use)1267 static inline bool nft_use_inc(u32 *use)
1268 {
1269 if (*use == UINT_MAX)
1270 return false;
1271
1272 (*use)++;
1273
1274 return true;
1275 }
1276
nft_use_dec(u32 * use)1277 static inline void nft_use_dec(u32 *use)
1278 {
1279 WARN_ON_ONCE((*use)-- == 0);
1280 }
1281
1282 /* For error and abort path: restore use counter to previous state. */
nft_use_inc_restore(u32 * use)1283 static inline void nft_use_inc_restore(u32 *use)
1284 {
1285 WARN_ON_ONCE(!nft_use_inc(use));
1286 }
1287
1288 #define nft_use_dec_restore nft_use_dec
1289
1290 /**
1291 * struct nft_table - nf_tables table
1292 *
1293 * @list: used internally
1294 * @chains_ht: chains in the table
1295 * @chains: same, for stable walks
1296 * @sets: sets in the table
1297 * @objects: stateful objects in the table
1298 * @flowtables: flow tables in the table
1299 * @hgenerator: handle generator state
1300 * @handle: table handle
1301 * @use: number of chain references to this table
1302 * @family:address family
1303 * @flags: table flag (see enum nft_table_flags)
1304 * @genmask: generation mask
1305 * @nlpid: netlink port ID
1306 * @name: name of the table
1307 * @udlen: length of the user data
1308 * @udata: user data
1309 * @validate_state: internal, set when transaction adds jumps
1310 */
1311 struct nft_table {
1312 struct list_head list;
1313 struct rhltable chains_ht;
1314 struct list_head chains;
1315 struct list_head sets;
1316 struct list_head objects;
1317 struct list_head flowtables;
1318 u64 hgenerator;
1319 u64 handle;
1320 u32 use;
1321 u16 family:6,
1322 flags:8,
1323 genmask:2;
1324 u32 nlpid;
1325 char *name;
1326 u16 udlen;
1327 u8 *udata;
1328 u8 validate_state;
1329 };
1330
nft_table_has_owner(const struct nft_table * table)1331 static inline bool nft_table_has_owner(const struct nft_table *table)
1332 {
1333 return table->flags & NFT_TABLE_F_OWNER;
1334 }
1335
nft_table_is_orphan(const struct nft_table * table)1336 static inline bool nft_table_is_orphan(const struct nft_table *table)
1337 {
1338 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) ==
1339 NFT_TABLE_F_PERSIST;
1340 }
1341
nft_base_chain_netdev(int family,u32 hooknum)1342 static inline bool nft_base_chain_netdev(int family, u32 hooknum)
1343 {
1344 return family == NFPROTO_NETDEV ||
1345 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS);
1346 }
1347
1348 void nft_register_chain_type(const struct nft_chain_type *);
1349 void nft_unregister_chain_type(const struct nft_chain_type *);
1350
1351 int nft_register_expr(struct nft_expr_type *);
1352 void nft_unregister_expr(struct nft_expr_type *);
1353
1354 int nft_verdict_dump(struct sk_buff *skb, int type,
1355 const struct nft_verdict *v);
1356
1357 /**
1358 * struct nft_object_hash_key - key to lookup nft_object
1359 *
1360 * @name: name of the stateful object to look up
1361 * @table: table the object belongs to
1362 */
1363 struct nft_object_hash_key {
1364 const char *name;
1365 const struct nft_table *table;
1366 };
1367
1368 /**
1369 * struct nft_object - nf_tables stateful object
1370 *
1371 * @list: table stateful object list node
1372 * @rhlhead: nft_objname_ht node
1373 * @key: keys that identify this object
1374 * @genmask: generation mask
1375 * @use: number of references to this stateful object
1376 * @handle: unique object handle
1377 * @udlen: length of user data
1378 * @udata: user data
1379 * @ops: object operations
1380 * @data: object data, layout depends on type
1381 */
1382 struct nft_object {
1383 struct list_head list;
1384 struct rhlist_head rhlhead;
1385 struct nft_object_hash_key key;
1386 u32 genmask:2;
1387 u32 use;
1388 u64 handle;
1389 u16 udlen;
1390 u8 *udata;
1391 /* runtime data below here */
1392 const struct nft_object_ops *ops ____cacheline_aligned;
1393 unsigned char data[]
1394 __attribute__((aligned(__alignof__(u64))));
1395 };
1396
nft_obj_data(const struct nft_object * obj)1397 static inline void *nft_obj_data(const struct nft_object *obj)
1398 {
1399 return (void *)obj->data;
1400 }
1401
1402 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1403
1404 struct nft_object *nft_obj_lookup(const struct net *net,
1405 const struct nft_table *table,
1406 const struct nlattr *nla, u32 objtype,
1407 u8 genmask);
1408
1409 void nft_obj_notify(struct net *net, const struct nft_table *table,
1410 struct nft_object *obj, u32 portid, u32 seq,
1411 int event, u16 flags, int family, int report, gfp_t gfp);
1412
1413 /**
1414 * struct nft_object_type - stateful object type
1415 *
1416 * @select_ops: function to select nft_object_ops
1417 * @ops: default ops, used when no select_ops functions is present
1418 * @list: list node in list of object types
1419 * @type: stateful object numeric type
1420 * @owner: module owner
1421 * @maxattr: maximum netlink attribute
1422 * @family: address family for AF-specific object types
1423 * @policy: netlink attribute policy
1424 */
1425 struct nft_object_type {
1426 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *,
1427 const struct nlattr * const tb[]);
1428 const struct nft_object_ops *ops;
1429 struct list_head list;
1430 u32 type;
1431 unsigned int maxattr;
1432 u8 family;
1433 struct module *owner;
1434 const struct nla_policy *policy;
1435 };
1436
1437 /**
1438 * struct nft_object_ops - stateful object operations
1439 *
1440 * @eval: stateful object evaluation function
1441 * @size: stateful object size
1442 * @init: initialize object from netlink attributes
1443 * @destroy: release existing stateful object
1444 * @dump: netlink dump stateful object
1445 * @update: update stateful object
1446 * @type: pointer to object type
1447 */
1448 struct nft_object_ops {
1449 void (*eval)(struct nft_object *obj,
1450 struct nft_regs *regs,
1451 const struct nft_pktinfo *pkt);
1452 unsigned int size;
1453 int (*init)(const struct nft_ctx *ctx,
1454 const struct nlattr *const tb[],
1455 struct nft_object *obj);
1456 void (*destroy)(const struct nft_ctx *ctx,
1457 struct nft_object *obj);
1458 int (*dump)(struct sk_buff *skb,
1459 struct nft_object *obj,
1460 bool reset);
1461 void (*update)(struct nft_object *obj,
1462 struct nft_object *newobj);
1463 const struct nft_object_type *type;
1464 };
1465
1466 int nft_register_obj(struct nft_object_type *obj_type);
1467 void nft_unregister_obj(struct nft_object_type *obj_type);
1468
1469 #define NFT_NETDEVICE_MAX 256
1470
1471 /**
1472 * struct nft_flowtable - nf_tables flow table
1473 *
1474 * @list: flow table list node in table list
1475 * @table: the table the flow table is contained in
1476 * @name: name of this flow table
1477 * @hooknum: hook number
1478 * @ops_len: number of hooks in array
1479 * @genmask: generation mask
1480 * @use: number of references to this flow table
1481 * @handle: unique object handle
1482 * @hook_list: hook list for hooks per net_device in flowtables
1483 * @data: rhashtable and garbage collector
1484 */
1485 struct nft_flowtable {
1486 struct list_head list;
1487 struct nft_table *table;
1488 char *name;
1489 int hooknum;
1490 int ops_len;
1491 u32 genmask:2;
1492 u32 use;
1493 u64 handle;
1494 /* runtime data below here */
1495 struct list_head hook_list ____cacheline_aligned;
1496 struct nf_flowtable data;
1497 };
1498
1499 struct nft_flowtable *nft_flowtable_lookup(const struct net *net,
1500 const struct nft_table *table,
1501 const struct nlattr *nla,
1502 u8 genmask);
1503
1504 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx,
1505 struct nft_flowtable *flowtable,
1506 enum nft_trans_phase phase);
1507
1508 void nft_register_flowtable_type(struct nf_flowtable_type *type);
1509 void nft_unregister_flowtable_type(struct nf_flowtable_type *type);
1510
1511 /**
1512 * struct nft_traceinfo - nft tracing information and state
1513 *
1514 * @trace: other struct members are initialised
1515 * @nf_trace: copy of skb->nf_trace before rule evaluation
1516 * @type: event type (enum nft_trace_types)
1517 * @skbid: hash of skb to be used as trace id
1518 * @packet_dumped: packet headers sent in a previous traceinfo message
1519 * @basechain: base chain currently processed
1520 */
1521 struct nft_traceinfo {
1522 bool trace;
1523 bool nf_trace;
1524 bool packet_dumped;
1525 enum nft_trace_types type:8;
1526 u32 skbid;
1527 const struct nft_base_chain *basechain;
1528 };
1529
1530 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1531 const struct nft_chain *basechain);
1532
1533 void nft_trace_notify(const struct nft_pktinfo *pkt,
1534 const struct nft_verdict *verdict,
1535 const struct nft_rule_dp *rule,
1536 struct nft_traceinfo *info);
1537
1538 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1539 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1540
1541 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1542 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1543
1544 #define MODULE_ALIAS_NFT_EXPR(name) \
1545 MODULE_ALIAS("nft-expr-" name)
1546
1547 #define MODULE_ALIAS_NFT_OBJ(type) \
1548 MODULE_ALIAS("nft-obj-" __stringify(type))
1549
1550 #if IS_ENABLED(CONFIG_NF_TABLES)
1551
1552 /*
1553 * The gencursor defines two generations, the currently active and the
1554 * next one. Objects contain a bitmask of 2 bits specifying the generations
1555 * they're active in. A set bit means they're inactive in the generation
1556 * represented by that bit.
1557 *
1558 * New objects start out as inactive in the current and active in the
1559 * next generation. When committing the ruleset the bitmask is cleared,
1560 * meaning they're active in all generations. When removing an object,
1561 * it is set inactive in the next generation. After committing the ruleset,
1562 * the objects are removed.
1563 */
nft_gencursor_next(const struct net * net)1564 static inline unsigned int nft_gencursor_next(const struct net *net)
1565 {
1566 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1567 }
1568
nft_genmask_next(const struct net * net)1569 static inline u8 nft_genmask_next(const struct net *net)
1570 {
1571 return 1 << nft_gencursor_next(net);
1572 }
1573
nft_genmask_cur(const struct net * net)1574 static inline u8 nft_genmask_cur(const struct net *net)
1575 {
1576 /* Use READ_ONCE() to prevent refetching the value for atomicity */
1577 return 1 << READ_ONCE(net->nft.gencursor);
1578 }
1579
1580 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1581
1582 /*
1583 * Generic transaction helpers
1584 */
1585
1586 /* Check if this object is currently active. */
1587 #define nft_is_active(__net, __obj) \
1588 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1589
1590 /* Check if this object is active in the next generation. */
1591 #define nft_is_active_next(__net, __obj) \
1592 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1593
1594 /* This object becomes active in the next generation. */
1595 #define nft_activate_next(__net, __obj) \
1596 (__obj)->genmask = nft_genmask_cur(__net)
1597
1598 /* This object becomes inactive in the next generation. */
1599 #define nft_deactivate_next(__net, __obj) \
1600 (__obj)->genmask = nft_genmask_next(__net)
1601
1602 /* After committing the ruleset, clear the stale generation bit. */
1603 #define nft_clear(__net, __obj) \
1604 (__obj)->genmask &= ~nft_genmask_next(__net)
1605 #define nft_active_genmask(__obj, __genmask) \
1606 !((__obj)->genmask & __genmask)
1607
1608 /*
1609 * Set element transaction helpers
1610 */
1611
nft_set_elem_active(const struct nft_set_ext * ext,u8 genmask)1612 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1613 u8 genmask)
1614 {
1615 return !(ext->genmask & genmask);
1616 }
1617
nft_set_elem_change_active(const struct net * net,const struct nft_set * set,struct nft_set_ext * ext)1618 static inline void nft_set_elem_change_active(const struct net *net,
1619 const struct nft_set *set,
1620 struct nft_set_ext *ext)
1621 {
1622 ext->genmask ^= nft_genmask_next(net);
1623 }
1624
1625 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */
1626
1627 #define NFT_SET_ELEM_DEAD_MASK (1 << 2)
1628
1629 #if defined(__LITTLE_ENDIAN_BITFIELD)
1630 #define NFT_SET_ELEM_DEAD_BIT 2
1631 #elif defined(__BIG_ENDIAN_BITFIELD)
1632 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1633 #else
1634 #error
1635 #endif
1636
nft_set_elem_dead(struct nft_set_ext * ext)1637 static inline void nft_set_elem_dead(struct nft_set_ext *ext)
1638 {
1639 unsigned long *word = (unsigned long *)ext;
1640
1641 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1642 set_bit(NFT_SET_ELEM_DEAD_BIT, word);
1643 }
1644
nft_set_elem_is_dead(const struct nft_set_ext * ext)1645 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext)
1646 {
1647 unsigned long *word = (unsigned long *)ext;
1648
1649 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1650 return test_bit(NFT_SET_ELEM_DEAD_BIT, word);
1651 }
1652
1653 /**
1654 * struct nft_trans - nf_tables object update in transaction
1655 *
1656 * @list: used internally
1657 * @net: struct net
1658 * @table: struct nft_table the object resides in
1659 * @msg_type: message type
1660 * @seq: netlink sequence number
1661 * @flags: modifiers to new request
1662 * @report: notify via unicast netlink message
1663 * @put_net: net needs to be put
1664 *
1665 * This is the information common to all objects in the transaction,
1666 * this must always be the first member of derived sub-types.
1667 */
1668 struct nft_trans {
1669 struct list_head list;
1670 struct net *net;
1671 struct nft_table *table;
1672 int msg_type;
1673 u32 seq;
1674 u16 flags;
1675 u8 report:1;
1676 u8 put_net:1;
1677 };
1678
1679 /**
1680 * struct nft_trans_binding - nf_tables object with binding support in transaction
1681 * @nft_trans: base structure, MUST be first member
1682 * @binding_list: list of objects with possible bindings
1683 *
1684 * This is the base type used by objects that can be bound to a chain.
1685 */
1686 struct nft_trans_binding {
1687 struct nft_trans nft_trans;
1688 struct list_head binding_list;
1689 };
1690
1691 struct nft_trans_rule {
1692 struct nft_trans nft_trans;
1693 struct nft_rule *rule;
1694 struct nft_chain *chain;
1695 struct nft_flow_rule *flow;
1696 u32 rule_id;
1697 bool bound;
1698 };
1699
1700 #define nft_trans_container_rule(trans) \
1701 container_of(trans, struct nft_trans_rule, nft_trans)
1702 #define nft_trans_rule(trans) \
1703 nft_trans_container_rule(trans)->rule
1704 #define nft_trans_flow_rule(trans) \
1705 nft_trans_container_rule(trans)->flow
1706 #define nft_trans_rule_id(trans) \
1707 nft_trans_container_rule(trans)->rule_id
1708 #define nft_trans_rule_bound(trans) \
1709 nft_trans_container_rule(trans)->bound
1710 #define nft_trans_rule_chain(trans) \
1711 nft_trans_container_rule(trans)->chain
1712
1713 struct nft_trans_set {
1714 struct nft_trans_binding nft_trans_binding;
1715 struct list_head list_trans_newset;
1716 struct nft_set *set;
1717 u32 set_id;
1718 u32 gc_int;
1719 u64 timeout;
1720 bool update;
1721 bool bound;
1722 u32 size;
1723 };
1724
1725 #define nft_trans_container_set(t) \
1726 container_of(t, struct nft_trans_set, nft_trans_binding.nft_trans)
1727 #define nft_trans_set(trans) \
1728 nft_trans_container_set(trans)->set
1729 #define nft_trans_set_id(trans) \
1730 nft_trans_container_set(trans)->set_id
1731 #define nft_trans_set_bound(trans) \
1732 nft_trans_container_set(trans)->bound
1733 #define nft_trans_set_update(trans) \
1734 nft_trans_container_set(trans)->update
1735 #define nft_trans_set_timeout(trans) \
1736 nft_trans_container_set(trans)->timeout
1737 #define nft_trans_set_gc_int(trans) \
1738 nft_trans_container_set(trans)->gc_int
1739 #define nft_trans_set_size(trans) \
1740 nft_trans_container_set(trans)->size
1741
1742 struct nft_trans_chain {
1743 struct nft_trans_binding nft_trans_binding;
1744 struct nft_chain *chain;
1745 char *name;
1746 struct nft_stats __percpu *stats;
1747 u8 policy;
1748 bool update;
1749 bool bound;
1750 u32 chain_id;
1751 struct nft_base_chain *basechain;
1752 struct list_head hook_list;
1753 };
1754
1755 #define nft_trans_container_chain(t) \
1756 container_of(t, struct nft_trans_chain, nft_trans_binding.nft_trans)
1757 #define nft_trans_chain(trans) \
1758 nft_trans_container_chain(trans)->chain
1759 #define nft_trans_chain_update(trans) \
1760 nft_trans_container_chain(trans)->update
1761 #define nft_trans_chain_name(trans) \
1762 nft_trans_container_chain(trans)->name
1763 #define nft_trans_chain_stats(trans) \
1764 nft_trans_container_chain(trans)->stats
1765 #define nft_trans_chain_policy(trans) \
1766 nft_trans_container_chain(trans)->policy
1767 #define nft_trans_chain_bound(trans) \
1768 nft_trans_container_chain(trans)->bound
1769 #define nft_trans_chain_id(trans) \
1770 nft_trans_container_chain(trans)->chain_id
1771 #define nft_trans_basechain(trans) \
1772 nft_trans_container_chain(trans)->basechain
1773 #define nft_trans_chain_hooks(trans) \
1774 nft_trans_container_chain(trans)->hook_list
1775
1776 struct nft_trans_table {
1777 struct nft_trans nft_trans;
1778 bool update;
1779 };
1780
1781 #define nft_trans_container_table(trans) \
1782 container_of(trans, struct nft_trans_table, nft_trans)
1783 #define nft_trans_table_update(trans) \
1784 nft_trans_container_table(trans)->update
1785
1786 enum nft_trans_elem_flags {
1787 NFT_TRANS_UPD_TIMEOUT = (1 << 0),
1788 NFT_TRANS_UPD_EXPIRATION = (1 << 1),
1789 };
1790
1791 struct nft_elem_update {
1792 u64 timeout;
1793 u64 expiration;
1794 u8 flags;
1795 };
1796
1797 struct nft_trans_one_elem {
1798 struct nft_elem_priv *priv;
1799 struct nft_elem_update *update;
1800 };
1801
1802 struct nft_trans_elem {
1803 struct nft_trans nft_trans;
1804 struct nft_set *set;
1805 bool bound;
1806 unsigned int nelems;
1807 struct nft_trans_one_elem elems[] __counted_by(nelems);
1808 };
1809
1810 #define nft_trans_container_elem(t) \
1811 container_of(t, struct nft_trans_elem, nft_trans)
1812 #define nft_trans_elem_set(trans) \
1813 nft_trans_container_elem(trans)->set
1814 #define nft_trans_elem_set_bound(trans) \
1815 nft_trans_container_elem(trans)->bound
1816
1817 struct nft_trans_obj {
1818 struct nft_trans nft_trans;
1819 struct nft_object *obj;
1820 struct nft_object *newobj;
1821 bool update;
1822 };
1823
1824 #define nft_trans_container_obj(t) \
1825 container_of(t, struct nft_trans_obj, nft_trans)
1826 #define nft_trans_obj(trans) \
1827 nft_trans_container_obj(trans)->obj
1828 #define nft_trans_obj_newobj(trans) \
1829 nft_trans_container_obj(trans)->newobj
1830 #define nft_trans_obj_update(trans) \
1831 nft_trans_container_obj(trans)->update
1832
1833 struct nft_trans_flowtable {
1834 struct nft_trans nft_trans;
1835 struct nft_flowtable *flowtable;
1836 struct list_head hook_list;
1837 u32 flags;
1838 bool update;
1839 };
1840
1841 #define nft_trans_container_flowtable(t) \
1842 container_of(t, struct nft_trans_flowtable, nft_trans)
1843 #define nft_trans_flowtable(trans) \
1844 nft_trans_container_flowtable(trans)->flowtable
1845 #define nft_trans_flowtable_update(trans) \
1846 nft_trans_container_flowtable(trans)->update
1847 #define nft_trans_flowtable_hooks(trans) \
1848 nft_trans_container_flowtable(trans)->hook_list
1849 #define nft_trans_flowtable_flags(trans) \
1850 nft_trans_container_flowtable(trans)->flags
1851
1852 #define NFT_TRANS_GC_BATCHCOUNT 256
1853
1854 struct nft_trans_gc {
1855 struct list_head list;
1856 struct net *net;
1857 struct nft_set *set;
1858 u32 seq;
1859 u16 count;
1860 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT];
1861 struct rcu_head rcu;
1862 };
1863
nft_trans_gc_space(const struct nft_trans_gc * trans)1864 static inline int nft_trans_gc_space(const struct nft_trans_gc *trans)
1865 {
1866 return NFT_TRANS_GC_BATCHCOUNT - trans->count;
1867 }
1868
nft_ctx_update(struct nft_ctx * ctx,const struct nft_trans * trans)1869 static inline void nft_ctx_update(struct nft_ctx *ctx,
1870 const struct nft_trans *trans)
1871 {
1872 switch (trans->msg_type) {
1873 case NFT_MSG_NEWRULE:
1874 case NFT_MSG_DELRULE:
1875 case NFT_MSG_DESTROYRULE:
1876 ctx->chain = nft_trans_rule_chain(trans);
1877 break;
1878 case NFT_MSG_NEWCHAIN:
1879 case NFT_MSG_DELCHAIN:
1880 case NFT_MSG_DESTROYCHAIN:
1881 ctx->chain = nft_trans_chain(trans);
1882 break;
1883 default:
1884 ctx->chain = NULL;
1885 break;
1886 }
1887
1888 ctx->net = trans->net;
1889 ctx->table = trans->table;
1890 ctx->family = trans->table->family;
1891 ctx->report = trans->report;
1892 ctx->flags = trans->flags;
1893 ctx->seq = trans->seq;
1894 }
1895
1896 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set,
1897 unsigned int gc_seq, gfp_t gfp);
1898 void nft_trans_gc_destroy(struct nft_trans_gc *trans);
1899
1900 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
1901 unsigned int gc_seq, gfp_t gfp);
1902 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc);
1903
1904 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp);
1905 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans);
1906
1907 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv);
1908
1909 struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc,
1910 unsigned int gc_seq);
1911 struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc);
1912
1913 void nft_setelem_data_deactivate(const struct net *net,
1914 const struct nft_set *set,
1915 struct nft_elem_priv *elem_priv);
1916
1917 int __init nft_chain_filter_init(void);
1918 void nft_chain_filter_fini(void);
1919
1920 void __init nft_chain_route_init(void);
1921 void nft_chain_route_fini(void);
1922
1923 void nf_tables_trans_destroy_flush_work(struct net *net);
1924
1925 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result);
1926 __be64 nf_jiffies64_to_msecs(u64 input);
1927
1928 #ifdef CONFIG_MODULES
1929 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...);
1930 #else
nft_request_module(struct net * net,const char * fmt,...)1931 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; }
1932 #endif
1933
1934 struct nftables_pernet {
1935 struct list_head tables;
1936 struct list_head commit_list;
1937 struct list_head destroy_list;
1938 struct list_head commit_set_list;
1939 struct list_head binding_list;
1940 struct list_head module_list;
1941 struct list_head notify_list;
1942 struct mutex commit_mutex;
1943 u64 table_handle;
1944 u64 tstamp;
1945 unsigned int gc_seq;
1946 u8 validate_state;
1947 struct work_struct destroy_work;
1948 };
1949
1950 extern unsigned int nf_tables_net_id;
1951
nft_pernet(const struct net * net)1952 static inline struct nftables_pernet *nft_pernet(const struct net *net)
1953 {
1954 return net_generic(net, nf_tables_net_id);
1955 }
1956
nft_net_tstamp(const struct net * net)1957 static inline u64 nft_net_tstamp(const struct net *net)
1958 {
1959 return nft_pernet(net)->tstamp;
1960 }
1961
1962 #define __NFT_REDUCE_READONLY 1UL
1963 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY
1964
1965 void nft_reg_track_update(struct nft_regs_track *track,
1966 const struct nft_expr *expr, u8 dreg, u8 len);
1967 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len);
1968 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg);
1969
nft_reg_track_cmp(struct nft_regs_track * track,const struct nft_expr * expr,u8 dreg)1970 static inline bool nft_reg_track_cmp(struct nft_regs_track *track,
1971 const struct nft_expr *expr, u8 dreg)
1972 {
1973 return track->regs[dreg].selector &&
1974 track->regs[dreg].selector->ops == expr->ops &&
1975 track->regs[dreg].num_reg == 0;
1976 }
1977
1978 #endif /* _NET_NF_TABLES_H */
1979