1 #ifndef _NET_NF_TABLES_H
2 #define _NET_NF_TABLES_H
4 #include <linux/module.h>
5 #include <linux/list.h>
6 #include <linux/netfilter.h>
7 #include <linux/netfilter/nfnetlink.h>
8 #include <linux/netfilter/x_tables.h>
9 #include <linux/netfilter/nf_tables.h>
10 #include <linux/u64_stats_sync.h>
11 #include <net/netlink.h>
13 #define NFT_JUMP_STACK_SIZE 16
18 const struct net_device
*in
;
19 const struct net_device
*out
;
23 /* for x_tables compatibility */
24 struct xt_action_param xt
;
27 static inline void nft_set_pktinfo(struct nft_pktinfo
*pkt
,
29 const struct nf_hook_state
*state
)
32 pkt
->net
= pkt
->xt
.net
= state
->net
;
33 pkt
->in
= pkt
->xt
.in
= state
->in
;
34 pkt
->out
= pkt
->xt
.out
= state
->out
;
35 pkt
->hook
= pkt
->xt
.hooknum
= state
->hook
;
36 pkt
->pf
= pkt
->xt
.family
= state
->pf
;
40 * struct nft_verdict - nf_tables verdict
42 * @code: nf_tables/netfilter verdict code
43 * @chain: destination chain for NFT_JUMP/NFT_GOTO
47 struct nft_chain
*chain
;
53 struct nft_verdict verdict
;
55 } __attribute__((aligned(__alignof__(u64
))));
58 * struct nft_regs - nf_tables register set
60 * @data: data registers
61 * @verdict: verdict register
63 * The first four data registers alias to the verdict register.
68 struct nft_verdict verdict
;
72 static inline void nft_data_copy(u32
*dst
, const struct nft_data
*src
,
75 memcpy(dst
, src
, len
);
78 static inline void nft_data_debug(const struct nft_data
*data
)
80 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
81 data
->data
[0], data
->data
[1],
82 data
->data
[2], data
->data
[3]);
86 * struct nft_ctx - nf_tables rule/set context
89 * @afi: address family info
90 * @table: the table the chain is contained in
91 * @chain: the chain the rule is contained in
92 * @nla: netlink attributes
93 * @portid: netlink portID of the original message
94 * @seq: netlink sequence number
95 * @report: notify via unicast netlink message
99 struct nft_af_info
*afi
;
100 struct nft_table
*table
;
101 struct nft_chain
*chain
;
102 const struct nlattr
* const *nla
;
108 struct nft_data_desc
{
109 enum nft_data_types type
;
113 int nft_data_init(const struct nft_ctx
*ctx
,
114 struct nft_data
*data
, unsigned int size
,
115 struct nft_data_desc
*desc
, const struct nlattr
*nla
);
116 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
);
117 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
118 enum nft_data_types type
, unsigned int len
);
120 static inline enum nft_data_types
nft_dreg_to_type(enum nft_registers reg
)
122 return reg
== NFT_REG_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
;
125 static inline enum nft_registers
nft_type_to_reg(enum nft_data_types type
)
127 return type
== NFT_DATA_VERDICT
? NFT_REG_VERDICT
: NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
;
130 unsigned int nft_parse_register(const struct nlattr
*attr
);
131 int nft_dump_register(struct sk_buff
*skb
, unsigned int attr
, unsigned int reg
);
133 int nft_validate_register_load(enum nft_registers reg
, unsigned int len
);
134 int nft_validate_register_store(const struct nft_ctx
*ctx
,
135 enum nft_registers reg
,
136 const struct nft_data
*data
,
137 enum nft_data_types type
, unsigned int len
);
140 * struct nft_userdata - user defined data associated with an object
142 * @len: length of the data
145 * The presence of user data is indicated in an object specific fashion,
146 * so a length of zero can't occur and the value "len" indicates data
149 struct nft_userdata
{
151 unsigned char data
[0];
155 * struct nft_set_elem - generic representation of set elements
158 * @priv: element private data and extensions
160 struct nft_set_elem
{
162 u32 buf
[NFT_DATA_VALUE_MAXLEN
/ sizeof(u32
)];
169 struct nft_set_iter
{
173 int (*fn
)(const struct nft_ctx
*ctx
,
174 const struct nft_set
*set
,
175 const struct nft_set_iter
*iter
,
176 const struct nft_set_elem
*elem
);
180 * struct nft_set_desc - description of set elements
184 * @size: number of set elements
186 struct nft_set_desc
{
193 * enum nft_set_class - performance class
195 * @NFT_LOOKUP_O_1: constant, O(1)
196 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
197 * @NFT_LOOKUP_O_N: linear, O(N)
201 NFT_SET_CLASS_O_LOG_N
,
206 * struct nft_set_estimate - estimation of memory and performance
209 * @size: required memory
210 * @class: lookup performance class
212 struct nft_set_estimate
{
214 enum nft_set_class
class;
221 * struct nft_set_ops - nf_tables set operations
223 * @lookup: look up an element within the set
224 * @insert: insert new element into set
225 * @activate: activate new element in the next generation
226 * @deactivate: deactivate element in the next generation
227 * @remove: remove element from set
228 * @walk: iterate over all set elemeennts
229 * @privsize: function to return size of set private data
230 * @init: initialize private data of new set instance
231 * @destroy: destroy private data of set instance
232 * @list: nf_tables_set_ops list node
233 * @owner: module reference
234 * @elemsize: element private size
235 * @features: features supported by the implementation
238 bool (*lookup
)(const struct nft_set
*set
,
240 const struct nft_set_ext
**ext
);
241 bool (*update
)(struct nft_set
*set
,
243 void *(*new)(struct nft_set
*,
244 const struct nft_expr
*,
246 const struct nft_expr
*expr
,
247 struct nft_regs
*regs
,
248 const struct nft_set_ext
**ext
);
250 int (*insert
)(const struct nft_set
*set
,
251 const struct nft_set_elem
*elem
);
252 void (*activate
)(const struct nft_set
*set
,
253 const struct nft_set_elem
*elem
);
254 void * (*deactivate
)(const struct nft_set
*set
,
255 const struct nft_set_elem
*elem
);
256 void (*remove
)(const struct nft_set
*set
,
257 const struct nft_set_elem
*elem
);
258 void (*walk
)(const struct nft_ctx
*ctx
,
259 const struct nft_set
*set
,
260 struct nft_set_iter
*iter
);
262 unsigned int (*privsize
)(const struct nlattr
* const nla
[]);
263 bool (*estimate
)(const struct nft_set_desc
*desc
,
265 struct nft_set_estimate
*est
);
266 int (*init
)(const struct nft_set
*set
,
267 const struct nft_set_desc
*desc
,
268 const struct nlattr
* const nla
[]);
269 void (*destroy
)(const struct nft_set
*set
);
271 struct list_head list
;
272 struct module
*owner
;
273 unsigned int elemsize
;
277 int nft_register_set(struct nft_set_ops
*ops
);
278 void nft_unregister_set(struct nft_set_ops
*ops
);
281 * struct nft_set - nf_tables set instance
283 * @list: table set list node
284 * @bindings: list of set bindings
285 * @name: name of the set
286 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
287 * @dtype: data type (verdict or numeric type defined by userspace)
288 * @size: maximum set size
289 * @nelems: number of elements
290 * @ndeact: number of deactivated elements queued for removal
291 * @timeout: default timeout value in msecs
292 * @gc_int: garbage collection interval in msecs
293 * @policy: set parameterization (see enum nft_set_policies)
294 * @udlen: user data length
297 * @pnet: network namespace
301 * @data: private set data
304 struct list_head list
;
305 struct list_head bindings
;
306 char name
[NFT_SET_MAXNAMELEN
];
316 unsigned char *udata
;
317 /* runtime data below here */
318 const struct nft_set_ops
*ops ____cacheline_aligned
;
324 __attribute__((aligned(__alignof__(u64
))));
327 static inline void *nft_set_priv(const struct nft_set
*set
)
329 return (void *)set
->data
;
332 static inline struct nft_set
*nft_set_container_of(const void *priv
)
334 return (void *)priv
- offsetof(struct nft_set
, data
);
337 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
338 const struct nlattr
*nla
);
339 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
340 const struct nlattr
*nla
);
342 static inline unsigned long nft_set_gc_interval(const struct nft_set
*set
)
344 return set
->gc_int
? msecs_to_jiffies(set
->gc_int
) : HZ
;
348 * struct nft_set_binding - nf_tables set binding
350 * @list: set bindings list node
351 * @chain: chain containing the rule bound to the set
352 * @flags: set action flags
354 * A set binding contains all information necessary for validation
355 * of new elements added to a bound set.
357 struct nft_set_binding
{
358 struct list_head list
;
359 const struct nft_chain
*chain
;
363 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
364 struct nft_set_binding
*binding
);
365 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
366 struct nft_set_binding
*binding
);
369 * enum nft_set_extensions - set extension type IDs
371 * @NFT_SET_EXT_KEY: element key
372 * @NFT_SET_EXT_DATA: mapping data
373 * @NFT_SET_EXT_FLAGS: element flags
374 * @NFT_SET_EXT_TIMEOUT: element timeout
375 * @NFT_SET_EXT_EXPIRATION: element expiration time
376 * @NFT_SET_EXT_USERDATA: user data associated with the element
377 * @NFT_SET_EXT_EXPR: expression assiociated with the element
378 * @NFT_SET_EXT_NUM: number of extension types
380 enum nft_set_extensions
{
385 NFT_SET_EXT_EXPIRATION
,
386 NFT_SET_EXT_USERDATA
,
392 * struct nft_set_ext_type - set extension type
394 * @len: fixed part length of the extension
395 * @align: alignment requirements of the extension
397 struct nft_set_ext_type
{
402 extern const struct nft_set_ext_type nft_set_ext_types
[];
405 * struct nft_set_ext_tmpl - set extension template
407 * @len: length of extension area
408 * @offset: offsets of individual extension types
410 struct nft_set_ext_tmpl
{
412 u8 offset
[NFT_SET_EXT_NUM
];
416 * struct nft_set_ext - set extensions
418 * @genmask: generation mask
419 * @offset: offsets of individual extension types
420 * @data: beginning of extension data
424 u8 offset
[NFT_SET_EXT_NUM
];
428 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl
*tmpl
)
430 memset(tmpl
, 0, sizeof(*tmpl
));
431 tmpl
->len
= sizeof(struct nft_set_ext
);
434 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl
*tmpl
, u8 id
,
437 tmpl
->len
= ALIGN(tmpl
->len
, nft_set_ext_types
[id
].align
);
438 BUG_ON(tmpl
->len
> U8_MAX
);
439 tmpl
->offset
[id
] = tmpl
->len
;
440 tmpl
->len
+= nft_set_ext_types
[id
].len
+ len
;
443 static inline void nft_set_ext_add(struct nft_set_ext_tmpl
*tmpl
, u8 id
)
445 nft_set_ext_add_length(tmpl
, id
, 0);
448 static inline void nft_set_ext_init(struct nft_set_ext
*ext
,
449 const struct nft_set_ext_tmpl
*tmpl
)
451 memcpy(ext
->offset
, tmpl
->offset
, sizeof(ext
->offset
));
454 static inline bool __nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
456 return !!ext
->offset
[id
];
459 static inline bool nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
461 return ext
&& __nft_set_ext_exists(ext
, id
);
464 static inline void *nft_set_ext(const struct nft_set_ext
*ext
, u8 id
)
466 return (void *)ext
+ ext
->offset
[id
];
469 static inline struct nft_data
*nft_set_ext_key(const struct nft_set_ext
*ext
)
471 return nft_set_ext(ext
, NFT_SET_EXT_KEY
);
474 static inline struct nft_data
*nft_set_ext_data(const struct nft_set_ext
*ext
)
476 return nft_set_ext(ext
, NFT_SET_EXT_DATA
);
479 static inline u8
*nft_set_ext_flags(const struct nft_set_ext
*ext
)
481 return nft_set_ext(ext
, NFT_SET_EXT_FLAGS
);
484 static inline u64
*nft_set_ext_timeout(const struct nft_set_ext
*ext
)
486 return nft_set_ext(ext
, NFT_SET_EXT_TIMEOUT
);
489 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext
*ext
)
491 return nft_set_ext(ext
, NFT_SET_EXT_EXPIRATION
);
494 static inline struct nft_userdata
*nft_set_ext_userdata(const struct nft_set_ext
*ext
)
496 return nft_set_ext(ext
, NFT_SET_EXT_USERDATA
);
499 static inline struct nft_expr
*nft_set_ext_expr(const struct nft_set_ext
*ext
)
501 return nft_set_ext(ext
, NFT_SET_EXT_EXPR
);
504 static inline bool nft_set_elem_expired(const struct nft_set_ext
*ext
)
506 return nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
) &&
507 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext
));
510 static inline struct nft_set_ext
*nft_set_elem_ext(const struct nft_set
*set
,
513 return elem
+ set
->ops
->elemsize
;
516 void *nft_set_elem_init(const struct nft_set
*set
,
517 const struct nft_set_ext_tmpl
*tmpl
,
518 const u32
*key
, const u32
*data
,
519 u64 timeout
, gfp_t gfp
);
520 void nft_set_elem_destroy(const struct nft_set
*set
, void *elem
);
523 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
526 * @set: set the elements belong to
527 * @cnt: count of elements
529 struct nft_set_gc_batch_head
{
531 const struct nft_set
*set
;
535 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
536 sizeof(struct nft_set_gc_batch_head)) / \
540 * struct nft_set_gc_batch - nf_tables set garbage collection batch
542 * @head: GC batch head
543 * @elems: garbage collection elements
545 struct nft_set_gc_batch
{
546 struct nft_set_gc_batch_head head
;
547 void *elems
[NFT_SET_GC_BATCH_SIZE
];
550 struct nft_set_gc_batch
*nft_set_gc_batch_alloc(const struct nft_set
*set
,
552 void nft_set_gc_batch_release(struct rcu_head
*rcu
);
554 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch
*gcb
)
557 call_rcu(&gcb
->head
.rcu
, nft_set_gc_batch_release
);
560 static inline struct nft_set_gc_batch
*
561 nft_set_gc_batch_check(const struct nft_set
*set
, struct nft_set_gc_batch
*gcb
,
565 if (gcb
->head
.cnt
+ 1 < ARRAY_SIZE(gcb
->elems
))
567 nft_set_gc_batch_complete(gcb
);
569 return nft_set_gc_batch_alloc(set
, gfp
);
572 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch
*gcb
,
575 gcb
->elems
[gcb
->head
.cnt
++] = elem
;
579 * struct nft_expr_type - nf_tables expression type
581 * @select_ops: function to select nft_expr_ops
582 * @ops: default ops, used when no select_ops functions is present
583 * @list: used internally
585 * @owner: module reference
586 * @policy: netlink attribute policy
587 * @maxattr: highest netlink attribute number
588 * @family: address family for AF-specific types
589 * @flags: expression type flags
591 struct nft_expr_type
{
592 const struct nft_expr_ops
*(*select_ops
)(const struct nft_ctx
*,
593 const struct nlattr
* const tb
[]);
594 const struct nft_expr_ops
*ops
;
595 struct list_head list
;
597 struct module
*owner
;
598 const struct nla_policy
*policy
;
599 unsigned int maxattr
;
604 #define NFT_EXPR_STATEFUL 0x1
607 * struct nft_expr_ops - nf_tables expression operations
609 * @eval: Expression evaluation function
610 * @size: full expression size, including private data size
611 * @init: initialization function
612 * @destroy: destruction function
613 * @dump: function to dump parameters
614 * @type: expression type
615 * @validate: validate expression, called during loop detection
616 * @data: extra data to attach to this expression operation
619 struct nft_expr_ops
{
620 void (*eval
)(const struct nft_expr
*expr
,
621 struct nft_regs
*regs
,
622 const struct nft_pktinfo
*pkt
);
623 int (*clone
)(struct nft_expr
*dst
,
624 const struct nft_expr
*src
);
627 int (*init
)(const struct nft_ctx
*ctx
,
628 const struct nft_expr
*expr
,
629 const struct nlattr
* const tb
[]);
630 void (*destroy
)(const struct nft_ctx
*ctx
,
631 const struct nft_expr
*expr
);
632 int (*dump
)(struct sk_buff
*skb
,
633 const struct nft_expr
*expr
);
634 int (*validate
)(const struct nft_ctx
*ctx
,
635 const struct nft_expr
*expr
,
636 const struct nft_data
**data
);
637 const struct nft_expr_type
*type
;
641 #define NFT_EXPR_MAXATTR 16
642 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
643 ALIGN(size, __alignof__(struct nft_expr)))
646 * struct nft_expr - nf_tables expression
648 * @ops: expression ops
649 * @data: expression private data
652 const struct nft_expr_ops
*ops
;
653 unsigned char data
[];
656 static inline void *nft_expr_priv(const struct nft_expr
*expr
)
658 return (void *)expr
->data
;
661 struct nft_expr
*nft_expr_init(const struct nft_ctx
*ctx
,
662 const struct nlattr
*nla
);
663 void nft_expr_destroy(const struct nft_ctx
*ctx
, struct nft_expr
*expr
);
664 int nft_expr_dump(struct sk_buff
*skb
, unsigned int attr
,
665 const struct nft_expr
*expr
);
667 static inline int nft_expr_clone(struct nft_expr
*dst
, struct nft_expr
*src
)
671 __module_get(src
->ops
->type
->owner
);
672 if (src
->ops
->clone
) {
674 err
= src
->ops
->clone(dst
, src
);
678 memcpy(dst
, src
, src
->ops
->size
);
684 * struct nft_rule - nf_tables rule
686 * @list: used internally
687 * @handle: rule handle
688 * @genmask: generation mask
689 * @dlen: length of expression data
690 * @udata: user data is appended to the rule
691 * @data: expression data
694 struct list_head list
;
700 __attribute__((aligned(__alignof__(struct nft_expr
))));
703 static inline struct nft_expr
*nft_expr_first(const struct nft_rule
*rule
)
705 return (struct nft_expr
*)&rule
->data
[0];
708 static inline struct nft_expr
*nft_expr_next(const struct nft_expr
*expr
)
710 return ((void *)expr
) + expr
->ops
->size
;
713 static inline struct nft_expr
*nft_expr_last(const struct nft_rule
*rule
)
715 return (struct nft_expr
*)&rule
->data
[rule
->dlen
];
718 static inline struct nft_userdata
*nft_userdata(const struct nft_rule
*rule
)
720 return (void *)&rule
->data
[rule
->dlen
];
724 * The last pointer isn't really necessary, but the compiler isn't able to
725 * determine that the result of nft_expr_last() is always the same since it
726 * can't assume that the dlen value wasn't changed within calls in the loop.
728 #define nft_rule_for_each_expr(expr, last, rule) \
729 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
731 (expr) = nft_expr_next(expr))
733 enum nft_chain_flags
{
734 NFT_BASE_CHAIN
= 0x1,
735 NFT_CHAIN_INACTIVE
= 0x2,
739 * struct nft_chain - nf_tables chain
741 * @rules: list of rules in the chain
742 * @list: used internally
743 * @table: table that this chain belongs to
744 * @handle: chain handle
745 * @use: number of jump references to this chain
746 * @level: length of longest path to this chain
747 * @flags: bitmask of enum nft_chain_flags
748 * @name: name of the chain
751 struct list_head rules
;
752 struct list_head list
;
753 struct nft_table
*table
;
758 char name
[NFT_CHAIN_MAXNAMELEN
];
761 enum nft_chain_type
{
762 NFT_CHAIN_T_DEFAULT
= 0,
769 * struct nf_chain_type - nf_tables chain type info
771 * @name: name of the type
772 * @type: numeric identifier
773 * @family: address family
774 * @owner: module owner
775 * @hook_mask: mask of valid hooks
776 * @hooks: hookfn overrides
778 struct nf_chain_type
{
780 enum nft_chain_type type
;
782 struct module
*owner
;
783 unsigned int hook_mask
;
784 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
787 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
788 enum nft_chain_type type
);
789 int nft_chain_validate_hooks(const struct nft_chain
*chain
,
790 unsigned int hook_flags
);
795 struct u64_stats_sync syncp
;
798 #define NFT_HOOK_OPS_MAX 2
799 #define NFT_BASECHAIN_DISABLED (1 << 0)
802 * struct nft_base_chain - nf_tables base chain
804 * @ops: netfilter hook ops
805 * @pnet: net namespace that this chain belongs to
807 * @policy: default policy
808 * @stats: per-cpu chain stats
810 * @dev_name: device name that this base chain is attached to (if any)
812 struct nft_base_chain
{
813 struct nf_hook_ops ops
[NFT_HOOK_OPS_MAX
];
815 const struct nf_chain_type
*type
;
818 struct nft_stats __percpu
*stats
;
819 struct nft_chain chain
;
820 char dev_name
[IFNAMSIZ
];
823 static inline struct nft_base_chain
*nft_base_chain(const struct nft_chain
*chain
)
825 return container_of(chain
, struct nft_base_chain
, chain
);
828 int __nft_release_basechain(struct nft_ctx
*ctx
);
830 unsigned int nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
);
833 * struct nft_table - nf_tables table
835 * @list: used internally
836 * @chains: chains in the table
837 * @sets: sets in the table
838 * @hgenerator: handle generator state
839 * @use: number of chain references to this table
840 * @flags: table flag (see enum nft_table_flags)
841 * @name: name of the table
844 struct list_head list
;
845 struct list_head chains
;
846 struct list_head sets
;
850 char name
[NFT_TABLE_MAXNAMELEN
];
854 NFT_AF_NEEDS_DEV
= (1 << 0),
858 * struct nft_af_info - nf_tables address family info
860 * @list: used internally
861 * @family: address family
862 * @nhooks: number of hooks in this family
863 * @owner: module owner
864 * @tables: used internally
865 * @flags: family flags
866 * @nops: number of hook ops in this family
867 * @hook_ops_init: initialization function for chain hook ops
868 * @hooks: hookfn overrides for packet validation
871 struct list_head list
;
874 struct module
*owner
;
875 struct list_head tables
;
878 void (*hook_ops_init
)(struct nf_hook_ops
*,
880 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
883 int nft_register_afinfo(struct net
*, struct nft_af_info
*);
884 void nft_unregister_afinfo(struct net
*, struct nft_af_info
*);
886 int nft_register_chain_type(const struct nf_chain_type
*);
887 void nft_unregister_chain_type(const struct nf_chain_type
*);
889 int nft_register_expr(struct nft_expr_type
*);
890 void nft_unregister_expr(struct nft_expr_type
*);
892 int nft_verdict_dump(struct sk_buff
*skb
, int type
,
893 const struct nft_verdict
*v
);
896 * struct nft_traceinfo - nft tracing information and state
898 * @pkt: pktinfo currently processed
899 * @basechain: base chain currently processed
900 * @chain: chain currently processed
901 * @rule: rule that was evaluated
902 * @verdict: verdict given by rule
903 * @type: event type (enum nft_trace_types)
904 * @packet_dumped: packet headers sent in a previous traceinfo message
905 * @trace: other struct members are initialised
907 struct nft_traceinfo
{
908 const struct nft_pktinfo
*pkt
;
909 const struct nft_base_chain
*basechain
;
910 const struct nft_chain
*chain
;
911 const struct nft_rule
*rule
;
912 const struct nft_verdict
*verdict
;
913 enum nft_trace_types type
;
918 void nft_trace_init(struct nft_traceinfo
*info
, const struct nft_pktinfo
*pkt
,
919 const struct nft_verdict
*verdict
,
920 const struct nft_chain
*basechain
);
922 void nft_trace_notify(struct nft_traceinfo
*info
);
924 #define nft_dereference(p) \
925 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
927 #define MODULE_ALIAS_NFT_FAMILY(family) \
928 MODULE_ALIAS("nft-afinfo-" __stringify(family))
930 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
931 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
933 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
934 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
936 #define MODULE_ALIAS_NFT_EXPR(name) \
937 MODULE_ALIAS("nft-expr-" name)
939 #define MODULE_ALIAS_NFT_SET() \
940 MODULE_ALIAS("nft-set")
943 * The gencursor defines two generations, the currently active and the
944 * next one. Objects contain a bitmask of 2 bits specifying the generations
945 * they're active in. A set bit means they're inactive in the generation
946 * represented by that bit.
948 * New objects start out as inactive in the current and active in the
949 * next generation. When committing the ruleset the bitmask is cleared,
950 * meaning they're active in all generations. When removing an object,
951 * it is set inactive in the next generation. After committing the ruleset,
952 * the objects are removed.
954 static inline unsigned int nft_gencursor_next(const struct net
*net
)
956 return net
->nft
.gencursor
+ 1 == 1 ? 1 : 0;
959 static inline u8
nft_genmask_next(const struct net
*net
)
961 return 1 << nft_gencursor_next(net
);
964 static inline u8
nft_genmask_cur(const struct net
*net
)
966 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
967 return 1 << ACCESS_ONCE(net
->nft
.gencursor
);
970 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
973 * Set element transaction helpers
976 static inline bool nft_set_elem_active(const struct nft_set_ext
*ext
,
979 return !(ext
->genmask
& genmask
);
982 static inline void nft_set_elem_change_active(const struct nft_set
*set
,
983 struct nft_set_ext
*ext
)
985 ext
->genmask
^= nft_genmask_next(read_pnet(&set
->pnet
));
989 * We use a free bit in the genmask field to indicate the element
990 * is busy, meaning it is currently being processed either by
991 * the netlink API or GC.
993 * Even though the genmask is only a single byte wide, this works
994 * because the extension structure if fully constant once initialized,
995 * so there are no non-atomic write accesses unless it is already
998 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1000 #if defined(__LITTLE_ENDIAN_BITFIELD)
1001 #define NFT_SET_ELEM_BUSY_BIT 2
1002 #elif defined(__BIG_ENDIAN_BITFIELD)
1003 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1008 static inline int nft_set_elem_mark_busy(struct nft_set_ext
*ext
)
1010 unsigned long *word
= (unsigned long *)ext
;
1012 BUILD_BUG_ON(offsetof(struct nft_set_ext
, genmask
) != 0);
1013 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
1016 static inline void nft_set_elem_clear_busy(struct nft_set_ext
*ext
)
1018 unsigned long *word
= (unsigned long *)ext
;
1020 clear_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
1024 * struct nft_trans - nf_tables object update in transaction
1026 * @list: used internally
1027 * @msg_type: message type
1028 * @ctx: transaction context
1029 * @data: internal information related to the transaction
1032 struct list_head list
;
1038 struct nft_trans_rule
{
1039 struct nft_rule
*rule
;
1042 #define nft_trans_rule(trans) \
1043 (((struct nft_trans_rule *)trans->data)->rule)
1045 struct nft_trans_set
{
1046 struct nft_set
*set
;
1050 #define nft_trans_set(trans) \
1051 (((struct nft_trans_set *)trans->data)->set)
1052 #define nft_trans_set_id(trans) \
1053 (((struct nft_trans_set *)trans->data)->set_id)
1055 struct nft_trans_chain
{
1057 char name
[NFT_CHAIN_MAXNAMELEN
];
1058 struct nft_stats __percpu
*stats
;
1062 #define nft_trans_chain_update(trans) \
1063 (((struct nft_trans_chain *)trans->data)->update)
1064 #define nft_trans_chain_name(trans) \
1065 (((struct nft_trans_chain *)trans->data)->name)
1066 #define nft_trans_chain_stats(trans) \
1067 (((struct nft_trans_chain *)trans->data)->stats)
1068 #define nft_trans_chain_policy(trans) \
1069 (((struct nft_trans_chain *)trans->data)->policy)
1071 struct nft_trans_table
{
1076 #define nft_trans_table_update(trans) \
1077 (((struct nft_trans_table *)trans->data)->update)
1078 #define nft_trans_table_enable(trans) \
1079 (((struct nft_trans_table *)trans->data)->enable)
1081 struct nft_trans_elem
{
1082 struct nft_set
*set
;
1083 struct nft_set_elem elem
;
1086 #define nft_trans_elem_set(trans) \
1087 (((struct nft_trans_elem *)trans->data)->set)
1088 #define nft_trans_elem(trans) \
1089 (((struct nft_trans_elem *)trans->data)->elem)
1091 #endif /* _NET_NF_TABLES_H */