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
;
25 /* for x_tables compatibility */
26 struct xt_action_param xt
;
29 static inline void nft_set_pktinfo(struct nft_pktinfo
*pkt
,
31 const struct nf_hook_state
*state
)
34 pkt
->net
= pkt
->xt
.net
= state
->net
;
35 pkt
->in
= pkt
->xt
.in
= state
->in
;
36 pkt
->out
= pkt
->xt
.out
= state
->out
;
37 pkt
->hook
= pkt
->xt
.hooknum
= state
->hook
;
38 pkt
->pf
= pkt
->xt
.family
= state
->pf
;
42 * struct nft_verdict - nf_tables verdict
44 * @code: nf_tables/netfilter verdict code
45 * @chain: destination chain for NFT_JUMP/NFT_GOTO
49 struct nft_chain
*chain
;
55 struct nft_verdict verdict
;
57 } __attribute__((aligned(__alignof__(u64
))));
60 * struct nft_regs - nf_tables register set
62 * @data: data registers
63 * @verdict: verdict register
65 * The first four data registers alias to the verdict register.
70 struct nft_verdict verdict
;
74 static inline void nft_data_copy(u32
*dst
, const struct nft_data
*src
,
77 memcpy(dst
, src
, len
);
80 static inline void nft_data_debug(const struct nft_data
*data
)
82 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
83 data
->data
[0], data
->data
[1],
84 data
->data
[2], data
->data
[3]);
88 * struct nft_ctx - nf_tables rule/set context
91 * @afi: address family info
92 * @table: the table the chain is contained in
93 * @chain: the chain the rule is contained in
94 * @nla: netlink attributes
95 * @portid: netlink portID of the original message
96 * @seq: netlink sequence number
97 * @report: notify via unicast netlink message
101 struct nft_af_info
*afi
;
102 struct nft_table
*table
;
103 struct nft_chain
*chain
;
104 const struct nlattr
* const *nla
;
110 struct nft_data_desc
{
111 enum nft_data_types type
;
115 int nft_data_init(const struct nft_ctx
*ctx
,
116 struct nft_data
*data
, unsigned int size
,
117 struct nft_data_desc
*desc
, const struct nlattr
*nla
);
118 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
);
119 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
120 enum nft_data_types type
, unsigned int len
);
122 static inline enum nft_data_types
nft_dreg_to_type(enum nft_registers reg
)
124 return reg
== NFT_REG_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
;
127 static inline enum nft_registers
nft_type_to_reg(enum nft_data_types type
)
129 return type
== NFT_DATA_VERDICT
? NFT_REG_VERDICT
: NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
;
132 unsigned int nft_parse_register(const struct nlattr
*attr
);
133 int nft_dump_register(struct sk_buff
*skb
, unsigned int attr
, unsigned int reg
);
135 int nft_validate_register_load(enum nft_registers reg
, unsigned int len
);
136 int nft_validate_register_store(const struct nft_ctx
*ctx
,
137 enum nft_registers reg
,
138 const struct nft_data
*data
,
139 enum nft_data_types type
, unsigned int len
);
142 * struct nft_userdata - user defined data associated with an object
144 * @len: length of the data
147 * The presence of user data is indicated in an object specific fashion,
148 * so a length of zero can't occur and the value "len" indicates data
151 struct nft_userdata
{
153 unsigned char data
[0];
157 * struct nft_set_elem - generic representation of set elements
160 * @priv: element private data and extensions
162 struct nft_set_elem
{
164 u32 buf
[NFT_DATA_VALUE_MAXLEN
/ sizeof(u32
)];
171 struct nft_set_iter
{
175 int (*fn
)(const struct nft_ctx
*ctx
,
176 const struct nft_set
*set
,
177 const struct nft_set_iter
*iter
,
178 const struct nft_set_elem
*elem
);
182 * struct nft_set_desc - description of set elements
186 * @size: number of set elements
188 struct nft_set_desc
{
195 * enum nft_set_class - performance class
197 * @NFT_LOOKUP_O_1: constant, O(1)
198 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
199 * @NFT_LOOKUP_O_N: linear, O(N)
203 NFT_SET_CLASS_O_LOG_N
,
208 * struct nft_set_estimate - estimation of memory and performance
211 * @size: required memory
212 * @class: lookup performance class
214 struct nft_set_estimate
{
216 enum nft_set_class
class;
223 * struct nft_set_ops - nf_tables set operations
225 * @lookup: look up an element within the set
226 * @insert: insert new element into set
227 * @activate: activate new element in the next generation
228 * @deactivate: deactivate element in the next generation
229 * @remove: remove element from set
230 * @walk: iterate over all set elemeennts
231 * @privsize: function to return size of set private data
232 * @init: initialize private data of new set instance
233 * @destroy: destroy private data of set instance
234 * @list: nf_tables_set_ops list node
235 * @owner: module reference
236 * @elemsize: element private size
237 * @features: features supported by the implementation
240 bool (*lookup
)(const struct nft_set
*set
,
242 const struct nft_set_ext
**ext
);
243 bool (*update
)(struct nft_set
*set
,
245 void *(*new)(struct nft_set
*,
246 const struct nft_expr
*,
248 const struct nft_expr
*expr
,
249 struct nft_regs
*regs
,
250 const struct nft_set_ext
**ext
);
252 int (*insert
)(const struct nft_set
*set
,
253 const struct nft_set_elem
*elem
);
254 void (*activate
)(const struct nft_set
*set
,
255 const struct nft_set_elem
*elem
);
256 void * (*deactivate
)(const struct nft_set
*set
,
257 const struct nft_set_elem
*elem
);
258 void (*remove
)(const struct nft_set
*set
,
259 const struct nft_set_elem
*elem
);
260 void (*walk
)(const struct nft_ctx
*ctx
,
261 const struct nft_set
*set
,
262 struct nft_set_iter
*iter
);
264 unsigned int (*privsize
)(const struct nlattr
* const nla
[]);
265 bool (*estimate
)(const struct nft_set_desc
*desc
,
267 struct nft_set_estimate
*est
);
268 int (*init
)(const struct nft_set
*set
,
269 const struct nft_set_desc
*desc
,
270 const struct nlattr
* const nla
[]);
271 void (*destroy
)(const struct nft_set
*set
);
273 struct list_head list
;
274 struct module
*owner
;
275 unsigned int elemsize
;
279 int nft_register_set(struct nft_set_ops
*ops
);
280 void nft_unregister_set(struct nft_set_ops
*ops
);
283 * struct nft_set - nf_tables set instance
285 * @list: table set list node
286 * @bindings: list of set bindings
287 * @name: name of the set
288 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
289 * @dtype: data type (verdict or numeric type defined by userspace)
290 * @size: maximum set size
291 * @nelems: number of elements
292 * @ndeact: number of deactivated elements queued for removal
293 * @timeout: default timeout value in msecs
294 * @gc_int: garbage collection interval in msecs
295 * @policy: set parameterization (see enum nft_set_policies)
297 * @pnet: network namespace
301 * @data: private set data
304 struct list_head list
;
305 struct list_head bindings
;
315 /* runtime data below here */
316 const struct nft_set_ops
*ops ____cacheline_aligned
;
322 __attribute__((aligned(__alignof__(u64
))));
325 static inline void *nft_set_priv(const struct nft_set
*set
)
327 return (void *)set
->data
;
330 static inline struct nft_set
*nft_set_container_of(const void *priv
)
332 return (void *)priv
- offsetof(struct nft_set
, data
);
335 struct nft_set
*nf_tables_set_lookup(const struct nft_table
*table
,
336 const struct nlattr
*nla
);
337 struct nft_set
*nf_tables_set_lookup_byid(const struct net
*net
,
338 const struct nlattr
*nla
);
340 static inline unsigned long nft_set_gc_interval(const struct nft_set
*set
)
342 return set
->gc_int
? msecs_to_jiffies(set
->gc_int
) : HZ
;
346 * struct nft_set_binding - nf_tables set binding
348 * @list: set bindings list node
349 * @chain: chain containing the rule bound to the set
350 * @flags: set action flags
352 * A set binding contains all information necessary for validation
353 * of new elements added to a bound set.
355 struct nft_set_binding
{
356 struct list_head list
;
357 const struct nft_chain
*chain
;
361 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
362 struct nft_set_binding
*binding
);
363 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
364 struct nft_set_binding
*binding
);
367 * enum nft_set_extensions - set extension type IDs
369 * @NFT_SET_EXT_KEY: element key
370 * @NFT_SET_EXT_DATA: mapping data
371 * @NFT_SET_EXT_FLAGS: element flags
372 * @NFT_SET_EXT_TIMEOUT: element timeout
373 * @NFT_SET_EXT_EXPIRATION: element expiration time
374 * @NFT_SET_EXT_USERDATA: user data associated with the element
375 * @NFT_SET_EXT_EXPR: expression assiociated with the element
376 * @NFT_SET_EXT_NUM: number of extension types
378 enum nft_set_extensions
{
383 NFT_SET_EXT_EXPIRATION
,
384 NFT_SET_EXT_USERDATA
,
390 * struct nft_set_ext_type - set extension type
392 * @len: fixed part length of the extension
393 * @align: alignment requirements of the extension
395 struct nft_set_ext_type
{
400 extern const struct nft_set_ext_type nft_set_ext_types
[];
403 * struct nft_set_ext_tmpl - set extension template
405 * @len: length of extension area
406 * @offset: offsets of individual extension types
408 struct nft_set_ext_tmpl
{
410 u8 offset
[NFT_SET_EXT_NUM
];
414 * struct nft_set_ext - set extensions
416 * @genmask: generation mask
417 * @offset: offsets of individual extension types
418 * @data: beginning of extension data
422 u8 offset
[NFT_SET_EXT_NUM
];
426 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl
*tmpl
)
428 memset(tmpl
, 0, sizeof(*tmpl
));
429 tmpl
->len
= sizeof(struct nft_set_ext
);
432 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl
*tmpl
, u8 id
,
435 tmpl
->len
= ALIGN(tmpl
->len
, nft_set_ext_types
[id
].align
);
436 BUG_ON(tmpl
->len
> U8_MAX
);
437 tmpl
->offset
[id
] = tmpl
->len
;
438 tmpl
->len
+= nft_set_ext_types
[id
].len
+ len
;
441 static inline void nft_set_ext_add(struct nft_set_ext_tmpl
*tmpl
, u8 id
)
443 nft_set_ext_add_length(tmpl
, id
, 0);
446 static inline void nft_set_ext_init(struct nft_set_ext
*ext
,
447 const struct nft_set_ext_tmpl
*tmpl
)
449 memcpy(ext
->offset
, tmpl
->offset
, sizeof(ext
->offset
));
452 static inline bool __nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
454 return !!ext
->offset
[id
];
457 static inline bool nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
459 return ext
&& __nft_set_ext_exists(ext
, id
);
462 static inline void *nft_set_ext(const struct nft_set_ext
*ext
, u8 id
)
464 return (void *)ext
+ ext
->offset
[id
];
467 static inline struct nft_data
*nft_set_ext_key(const struct nft_set_ext
*ext
)
469 return nft_set_ext(ext
, NFT_SET_EXT_KEY
);
472 static inline struct nft_data
*nft_set_ext_data(const struct nft_set_ext
*ext
)
474 return nft_set_ext(ext
, NFT_SET_EXT_DATA
);
477 static inline u8
*nft_set_ext_flags(const struct nft_set_ext
*ext
)
479 return nft_set_ext(ext
, NFT_SET_EXT_FLAGS
);
482 static inline u64
*nft_set_ext_timeout(const struct nft_set_ext
*ext
)
484 return nft_set_ext(ext
, NFT_SET_EXT_TIMEOUT
);
487 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext
*ext
)
489 return nft_set_ext(ext
, NFT_SET_EXT_EXPIRATION
);
492 static inline struct nft_userdata
*nft_set_ext_userdata(const struct nft_set_ext
*ext
)
494 return nft_set_ext(ext
, NFT_SET_EXT_USERDATA
);
497 static inline struct nft_expr
*nft_set_ext_expr(const struct nft_set_ext
*ext
)
499 return nft_set_ext(ext
, NFT_SET_EXT_EXPR
);
502 static inline bool nft_set_elem_expired(const struct nft_set_ext
*ext
)
504 return nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
) &&
505 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext
));
508 static inline struct nft_set_ext
*nft_set_elem_ext(const struct nft_set
*set
,
511 return elem
+ set
->ops
->elemsize
;
514 void *nft_set_elem_init(const struct nft_set
*set
,
515 const struct nft_set_ext_tmpl
*tmpl
,
516 const u32
*key
, const u32
*data
,
517 u64 timeout
, gfp_t gfp
);
518 void nft_set_elem_destroy(const struct nft_set
*set
, void *elem
);
521 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
524 * @set: set the elements belong to
525 * @cnt: count of elements
527 struct nft_set_gc_batch_head
{
529 const struct nft_set
*set
;
533 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
534 sizeof(struct nft_set_gc_batch_head)) / \
538 * struct nft_set_gc_batch - nf_tables set garbage collection batch
540 * @head: GC batch head
541 * @elems: garbage collection elements
543 struct nft_set_gc_batch
{
544 struct nft_set_gc_batch_head head
;
545 void *elems
[NFT_SET_GC_BATCH_SIZE
];
548 struct nft_set_gc_batch
*nft_set_gc_batch_alloc(const struct nft_set
*set
,
550 void nft_set_gc_batch_release(struct rcu_head
*rcu
);
552 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch
*gcb
)
555 call_rcu(&gcb
->head
.rcu
, nft_set_gc_batch_release
);
558 static inline struct nft_set_gc_batch
*
559 nft_set_gc_batch_check(const struct nft_set
*set
, struct nft_set_gc_batch
*gcb
,
563 if (gcb
->head
.cnt
+ 1 < ARRAY_SIZE(gcb
->elems
))
565 nft_set_gc_batch_complete(gcb
);
567 return nft_set_gc_batch_alloc(set
, gfp
);
570 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch
*gcb
,
573 gcb
->elems
[gcb
->head
.cnt
++] = elem
;
577 * struct nft_expr_type - nf_tables expression type
579 * @select_ops: function to select nft_expr_ops
580 * @ops: default ops, used when no select_ops functions is present
581 * @list: used internally
583 * @owner: module reference
584 * @policy: netlink attribute policy
585 * @maxattr: highest netlink attribute number
586 * @family: address family for AF-specific types
587 * @flags: expression type flags
589 struct nft_expr_type
{
590 const struct nft_expr_ops
*(*select_ops
)(const struct nft_ctx
*,
591 const struct nlattr
* const tb
[]);
592 const struct nft_expr_ops
*ops
;
593 struct list_head list
;
595 struct module
*owner
;
596 const struct nla_policy
*policy
;
597 unsigned int maxattr
;
602 #define NFT_EXPR_STATEFUL 0x1
605 * struct nft_expr_ops - nf_tables expression operations
607 * @eval: Expression evaluation function
608 * @size: full expression size, including private data size
609 * @init: initialization function
610 * @destroy: destruction function
611 * @dump: function to dump parameters
612 * @type: expression type
613 * @validate: validate expression, called during loop detection
614 * @data: extra data to attach to this expression operation
617 struct nft_expr_ops
{
618 void (*eval
)(const struct nft_expr
*expr
,
619 struct nft_regs
*regs
,
620 const struct nft_pktinfo
*pkt
);
621 int (*clone
)(struct nft_expr
*dst
,
622 const struct nft_expr
*src
);
625 int (*init
)(const struct nft_ctx
*ctx
,
626 const struct nft_expr
*expr
,
627 const struct nlattr
* const tb
[]);
628 void (*destroy
)(const struct nft_ctx
*ctx
,
629 const struct nft_expr
*expr
);
630 int (*dump
)(struct sk_buff
*skb
,
631 const struct nft_expr
*expr
);
632 int (*validate
)(const struct nft_ctx
*ctx
,
633 const struct nft_expr
*expr
,
634 const struct nft_data
**data
);
635 const struct nft_expr_type
*type
;
639 #define NFT_EXPR_MAXATTR 16
640 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
641 ALIGN(size, __alignof__(struct nft_expr)))
644 * struct nft_expr - nf_tables expression
646 * @ops: expression ops
647 * @data: expression private data
650 const struct nft_expr_ops
*ops
;
651 unsigned char data
[];
654 static inline void *nft_expr_priv(const struct nft_expr
*expr
)
656 return (void *)expr
->data
;
659 struct nft_expr
*nft_expr_init(const struct nft_ctx
*ctx
,
660 const struct nlattr
*nla
);
661 void nft_expr_destroy(const struct nft_ctx
*ctx
, struct nft_expr
*expr
);
662 int nft_expr_dump(struct sk_buff
*skb
, unsigned int attr
,
663 const struct nft_expr
*expr
);
665 static inline int nft_expr_clone(struct nft_expr
*dst
, struct nft_expr
*src
)
669 __module_get(src
->ops
->type
->owner
);
670 if (src
->ops
->clone
) {
672 err
= src
->ops
->clone(dst
, src
);
676 memcpy(dst
, src
, src
->ops
->size
);
682 * struct nft_rule - nf_tables rule
684 * @list: used internally
685 * @handle: rule handle
686 * @genmask: generation mask
687 * @dlen: length of expression data
688 * @udata: user data is appended to the rule
689 * @data: expression data
692 struct list_head list
;
698 __attribute__((aligned(__alignof__(struct nft_expr
))));
701 static inline struct nft_expr
*nft_expr_first(const struct nft_rule
*rule
)
703 return (struct nft_expr
*)&rule
->data
[0];
706 static inline struct nft_expr
*nft_expr_next(const struct nft_expr
*expr
)
708 return ((void *)expr
) + expr
->ops
->size
;
711 static inline struct nft_expr
*nft_expr_last(const struct nft_rule
*rule
)
713 return (struct nft_expr
*)&rule
->data
[rule
->dlen
];
716 static inline struct nft_userdata
*nft_userdata(const struct nft_rule
*rule
)
718 return (void *)&rule
->data
[rule
->dlen
];
722 * The last pointer isn't really necessary, but the compiler isn't able to
723 * determine that the result of nft_expr_last() is always the same since it
724 * can't assume that the dlen value wasn't changed within calls in the loop.
726 #define nft_rule_for_each_expr(expr, last, rule) \
727 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
729 (expr) = nft_expr_next(expr))
731 enum nft_chain_flags
{
732 NFT_BASE_CHAIN
= 0x1,
733 NFT_CHAIN_INACTIVE
= 0x2,
737 * struct nft_chain - nf_tables chain
739 * @rules: list of rules in the chain
740 * @list: used internally
741 * @table: table that this chain belongs to
742 * @handle: chain handle
743 * @use: number of jump references to this chain
744 * @level: length of longest path to this chain
745 * @flags: bitmask of enum nft_chain_flags
746 * @name: name of the chain
749 struct list_head rules
;
750 struct list_head list
;
751 struct nft_table
*table
;
756 char name
[NFT_CHAIN_MAXNAMELEN
];
759 enum nft_chain_type
{
760 NFT_CHAIN_T_DEFAULT
= 0,
767 * struct nf_chain_type - nf_tables chain type info
769 * @name: name of the type
770 * @type: numeric identifier
771 * @family: address family
772 * @owner: module owner
773 * @hook_mask: mask of valid hooks
774 * @hooks: hookfn overrides
776 struct nf_chain_type
{
778 enum nft_chain_type type
;
780 struct module
*owner
;
781 unsigned int hook_mask
;
782 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
785 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
786 enum nft_chain_type type
);
787 int nft_chain_validate_hooks(const struct nft_chain
*chain
,
788 unsigned int hook_flags
);
793 struct u64_stats_sync syncp
;
796 #define NFT_HOOK_OPS_MAX 2
797 #define NFT_BASECHAIN_DISABLED (1 << 0)
800 * struct nft_base_chain - nf_tables base chain
802 * @ops: netfilter hook ops
803 * @pnet: net namespace that this chain belongs to
805 * @policy: default policy
806 * @stats: per-cpu chain stats
808 * @dev_name: device name that this base chain is attached to (if any)
810 struct nft_base_chain
{
811 struct nf_hook_ops ops
[NFT_HOOK_OPS_MAX
];
813 const struct nf_chain_type
*type
;
816 struct nft_stats __percpu
*stats
;
817 struct nft_chain chain
;
818 char dev_name
[IFNAMSIZ
];
821 static inline struct nft_base_chain
*nft_base_chain(const struct nft_chain
*chain
)
823 return container_of(chain
, struct nft_base_chain
, chain
);
826 int nft_register_basechain(struct nft_base_chain
*basechain
,
827 unsigned int hook_nops
);
828 void nft_unregister_basechain(struct nft_base_chain
*basechain
,
829 unsigned int hook_nops
);
831 unsigned int nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
);
834 * struct nft_table - nf_tables table
836 * @list: used internally
837 * @chains: chains in the table
838 * @sets: sets in the table
839 * @hgenerator: handle generator state
840 * @use: number of chain references to this table
841 * @flags: table flag (see enum nft_table_flags)
842 * @name: name of the table
845 struct list_head list
;
846 struct list_head chains
;
847 struct list_head sets
;
851 char name
[NFT_TABLE_MAXNAMELEN
];
855 NFT_AF_NEEDS_DEV
= (1 << 0),
859 * struct nft_af_info - nf_tables address family info
861 * @list: used internally
862 * @family: address family
863 * @nhooks: number of hooks in this family
864 * @owner: module owner
865 * @tables: used internally
866 * @flags: family flags
867 * @nops: number of hook ops in this family
868 * @hook_ops_init: initialization function for chain hook ops
869 * @hooks: hookfn overrides for packet validation
872 struct list_head list
;
875 struct module
*owner
;
876 struct list_head tables
;
879 void (*hook_ops_init
)(struct nf_hook_ops
*,
881 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
884 int nft_register_afinfo(struct net
*, struct nft_af_info
*);
885 void nft_unregister_afinfo(struct nft_af_info
*);
887 int nft_register_chain_type(const struct nf_chain_type
*);
888 void nft_unregister_chain_type(const struct nf_chain_type
*);
890 int nft_register_expr(struct nft_expr_type
*);
891 void nft_unregister_expr(struct nft_expr_type
*);
893 #define nft_dereference(p) \
894 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
896 #define MODULE_ALIAS_NFT_FAMILY(family) \
897 MODULE_ALIAS("nft-afinfo-" __stringify(family))
899 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
900 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
902 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
903 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
905 #define MODULE_ALIAS_NFT_EXPR(name) \
906 MODULE_ALIAS("nft-expr-" name)
908 #define MODULE_ALIAS_NFT_SET() \
909 MODULE_ALIAS("nft-set")
912 * The gencursor defines two generations, the currently active and the
913 * next one. Objects contain a bitmask of 2 bits specifying the generations
914 * they're active in. A set bit means they're inactive in the generation
915 * represented by that bit.
917 * New objects start out as inactive in the current and active in the
918 * next generation. When committing the ruleset the bitmask is cleared,
919 * meaning they're active in all generations. When removing an object,
920 * it is set inactive in the next generation. After committing the ruleset,
921 * the objects are removed.
923 static inline unsigned int nft_gencursor_next(const struct net
*net
)
925 return net
->nft
.gencursor
+ 1 == 1 ? 1 : 0;
928 static inline u8
nft_genmask_next(const struct net
*net
)
930 return 1 << nft_gencursor_next(net
);
933 static inline u8
nft_genmask_cur(const struct net
*net
)
935 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
936 return 1 << ACCESS_ONCE(net
->nft
.gencursor
);
939 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
942 * Set element transaction helpers
945 static inline bool nft_set_elem_active(const struct nft_set_ext
*ext
,
948 return !(ext
->genmask
& genmask
);
951 static inline void nft_set_elem_change_active(const struct nft_set
*set
,
952 struct nft_set_ext
*ext
)
954 ext
->genmask
^= nft_genmask_next(read_pnet(&set
->pnet
));
958 * We use a free bit in the genmask field to indicate the element
959 * is busy, meaning it is currently being processed either by
960 * the netlink API or GC.
962 * Even though the genmask is only a single byte wide, this works
963 * because the extension structure if fully constant once initialized,
964 * so there are no non-atomic write accesses unless it is already
967 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
969 #if defined(__LITTLE_ENDIAN_BITFIELD)
970 #define NFT_SET_ELEM_BUSY_BIT 2
971 #elif defined(__BIG_ENDIAN_BITFIELD)
972 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
977 static inline int nft_set_elem_mark_busy(struct nft_set_ext
*ext
)
979 unsigned long *word
= (unsigned long *)ext
;
981 BUILD_BUG_ON(offsetof(struct nft_set_ext
, genmask
) != 0);
982 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
985 static inline void nft_set_elem_clear_busy(struct nft_set_ext
*ext
)
987 unsigned long *word
= (unsigned long *)ext
;
989 clear_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
993 * struct nft_trans - nf_tables object update in transaction
995 * @list: used internally
996 * @msg_type: message type
997 * @ctx: transaction context
998 * @data: internal information related to the transaction
1001 struct list_head list
;
1007 struct nft_trans_rule
{
1008 struct nft_rule
*rule
;
1011 #define nft_trans_rule(trans) \
1012 (((struct nft_trans_rule *)trans->data)->rule)
1014 struct nft_trans_set
{
1015 struct nft_set
*set
;
1019 #define nft_trans_set(trans) \
1020 (((struct nft_trans_set *)trans->data)->set)
1021 #define nft_trans_set_id(trans) \
1022 (((struct nft_trans_set *)trans->data)->set_id)
1024 struct nft_trans_chain
{
1026 char name
[NFT_CHAIN_MAXNAMELEN
];
1027 struct nft_stats __percpu
*stats
;
1031 #define nft_trans_chain_update(trans) \
1032 (((struct nft_trans_chain *)trans->data)->update)
1033 #define nft_trans_chain_name(trans) \
1034 (((struct nft_trans_chain *)trans->data)->name)
1035 #define nft_trans_chain_stats(trans) \
1036 (((struct nft_trans_chain *)trans->data)->stats)
1037 #define nft_trans_chain_policy(trans) \
1038 (((struct nft_trans_chain *)trans->data)->policy)
1040 struct nft_trans_table
{
1045 #define nft_trans_table_update(trans) \
1046 (((struct nft_trans_table *)trans->data)->update)
1047 #define nft_trans_table_enable(trans) \
1048 (((struct nft_trans_table *)trans->data)->enable)
1050 struct nft_trans_elem
{
1051 struct nft_set
*set
;
1052 struct nft_set_elem elem
;
1055 #define nft_trans_elem_set(trans) \
1056 (((struct nft_trans_elem *)trans->data)->set)
1057 #define nft_trans_elem(trans) \
1058 (((struct nft_trans_elem *)trans->data)->elem)
1060 #endif /* _NET_NF_TABLES_H */