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
19 /* for x_tables compatibility */
20 struct xt_action_param xt
;
23 static inline struct net
*nft_net(const struct nft_pktinfo
*pkt
)
25 return pkt
->xt
.state
->net
;
28 static inline unsigned int nft_hook(const struct nft_pktinfo
*pkt
)
30 return pkt
->xt
.state
->hook
;
33 static inline u8
nft_pf(const struct nft_pktinfo
*pkt
)
35 return pkt
->xt
.state
->pf
;
38 static inline const struct net_device
*nft_in(const struct nft_pktinfo
*pkt
)
40 return pkt
->xt
.state
->in
;
43 static inline const struct net_device
*nft_out(const struct nft_pktinfo
*pkt
)
45 return pkt
->xt
.state
->out
;
48 static inline void nft_set_pktinfo(struct nft_pktinfo
*pkt
,
50 const struct nf_hook_state
*state
)
53 pkt
->xt
.state
= state
;
56 static inline void nft_set_pktinfo_proto_unspec(struct nft_pktinfo
*pkt
,
59 pkt
->tprot_set
= false;
65 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo
*pkt
,
67 const struct nf_hook_state
*state
)
69 nft_set_pktinfo(pkt
, skb
, state
);
70 nft_set_pktinfo_proto_unspec(pkt
, skb
);
74 * struct nft_verdict - nf_tables verdict
76 * @code: nf_tables/netfilter verdict code
77 * @chain: destination chain for NFT_JUMP/NFT_GOTO
81 struct nft_chain
*chain
;
87 struct nft_verdict verdict
;
89 } __attribute__((aligned(__alignof__(u64
))));
92 * struct nft_regs - nf_tables register set
94 * @data: data registers
95 * @verdict: verdict register
97 * The first four data registers alias to the verdict register.
102 struct nft_verdict verdict
;
106 static inline void nft_data_copy(u32
*dst
, const struct nft_data
*src
,
109 memcpy(dst
, src
, len
);
112 static inline void nft_data_debug(const struct nft_data
*data
)
114 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
115 data
->data
[0], data
->data
[1],
116 data
->data
[2], data
->data
[3]);
120 * struct nft_ctx - nf_tables rule/set context
122 * @net: net namespace
123 * @afi: address family info
124 * @table: the table the chain is contained in
125 * @chain: the chain the rule is contained in
126 * @nla: netlink attributes
127 * @portid: netlink portID of the original message
128 * @seq: netlink sequence number
129 * @report: notify via unicast netlink message
133 struct nft_af_info
*afi
;
134 struct nft_table
*table
;
135 struct nft_chain
*chain
;
136 const struct nlattr
* const *nla
;
142 struct nft_data_desc
{
143 enum nft_data_types type
;
147 int nft_data_init(const struct nft_ctx
*ctx
,
148 struct nft_data
*data
, unsigned int size
,
149 struct nft_data_desc
*desc
, const struct nlattr
*nla
);
150 void nft_data_uninit(const struct nft_data
*data
, enum nft_data_types type
);
151 int nft_data_dump(struct sk_buff
*skb
, int attr
, const struct nft_data
*data
,
152 enum nft_data_types type
, unsigned int len
);
154 static inline enum nft_data_types
nft_dreg_to_type(enum nft_registers reg
)
156 return reg
== NFT_REG_VERDICT
? NFT_DATA_VERDICT
: NFT_DATA_VALUE
;
159 static inline enum nft_registers
nft_type_to_reg(enum nft_data_types type
)
161 return type
== NFT_DATA_VERDICT
? NFT_REG_VERDICT
: NFT_REG_1
* NFT_REG_SIZE
/ NFT_REG32_SIZE
;
164 int nft_parse_u32_check(const struct nlattr
*attr
, int max
, u32
*dest
);
165 unsigned int nft_parse_register(const struct nlattr
*attr
);
166 int nft_dump_register(struct sk_buff
*skb
, unsigned int attr
, unsigned int reg
);
168 int nft_validate_register_load(enum nft_registers reg
, unsigned int len
);
169 int nft_validate_register_store(const struct nft_ctx
*ctx
,
170 enum nft_registers reg
,
171 const struct nft_data
*data
,
172 enum nft_data_types type
, unsigned int len
);
175 * struct nft_userdata - user defined data associated with an object
177 * @len: length of the data
180 * The presence of user data is indicated in an object specific fashion,
181 * so a length of zero can't occur and the value "len" indicates data
184 struct nft_userdata
{
186 unsigned char data
[0];
190 * struct nft_set_elem - generic representation of set elements
193 * @priv: element private data and extensions
195 struct nft_set_elem
{
197 u32 buf
[NFT_DATA_VALUE_MAXLEN
/ sizeof(u32
)];
204 struct nft_set_iter
{
210 int (*fn
)(const struct nft_ctx
*ctx
,
212 const struct nft_set_iter
*iter
,
213 struct nft_set_elem
*elem
);
217 * struct nft_set_desc - description of set elements
221 * @size: number of set elements
223 struct nft_set_desc
{
230 * enum nft_set_class - performance class
232 * @NFT_LOOKUP_O_1: constant, O(1)
233 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
234 * @NFT_LOOKUP_O_N: linear, O(N)
238 NFT_SET_CLASS_O_LOG_N
,
243 * struct nft_set_estimate - estimation of memory and performance
246 * @size: required memory
247 * @lookup: lookup performance class
248 * @space: memory class
250 struct nft_set_estimate
{
252 enum nft_set_class lookup
;
253 enum nft_set_class space
;
260 * struct nft_set_ops - nf_tables set operations
262 * @lookup: look up an element within the set
263 * @insert: insert new element into set
264 * @activate: activate new element in the next generation
265 * @deactivate: lookup for element and deactivate it in the next generation
266 * @flush: deactivate element in the next generation
267 * @remove: remove element from set
268 * @walk: iterate over all set elemeennts
269 * @privsize: function to return size of set private data
270 * @init: initialize private data of new set instance
271 * @destroy: destroy private data of set instance
272 * @list: nf_tables_set_ops list node
273 * @owner: module reference
274 * @elemsize: element private size
275 * @features: features supported by the implementation
278 bool (*lookup
)(const struct net
*net
,
279 const struct nft_set
*set
,
281 const struct nft_set_ext
**ext
);
282 bool (*update
)(struct nft_set
*set
,
284 void *(*new)(struct nft_set
*,
285 const struct nft_expr
*,
287 const struct nft_expr
*expr
,
288 struct nft_regs
*regs
,
289 const struct nft_set_ext
**ext
);
291 int (*insert
)(const struct net
*net
,
292 const struct nft_set
*set
,
293 const struct nft_set_elem
*elem
,
294 struct nft_set_ext
**ext
);
295 void (*activate
)(const struct net
*net
,
296 const struct nft_set
*set
,
297 const struct nft_set_elem
*elem
);
298 void * (*deactivate
)(const struct net
*net
,
299 const struct nft_set
*set
,
300 const struct nft_set_elem
*elem
);
301 bool (*flush
)(const struct net
*net
,
302 const struct nft_set
*set
,
304 void (*remove
)(const struct net
*net
,
305 const struct nft_set
*set
,
306 const struct nft_set_elem
*elem
);
307 void (*walk
)(const struct nft_ctx
*ctx
,
309 struct nft_set_iter
*iter
);
311 unsigned int (*privsize
)(const struct nlattr
* const nla
[]);
312 bool (*estimate
)(const struct nft_set_desc
*desc
,
314 struct nft_set_estimate
*est
);
315 int (*init
)(const struct nft_set
*set
,
316 const struct nft_set_desc
*desc
,
317 const struct nlattr
* const nla
[]);
318 void (*destroy
)(const struct nft_set
*set
);
320 struct list_head list
;
321 struct module
*owner
;
322 unsigned int elemsize
;
326 int nft_register_set(struct nft_set_ops
*ops
);
327 void nft_unregister_set(struct nft_set_ops
*ops
);
330 * struct nft_set - nf_tables set instance
332 * @list: table set list node
333 * @bindings: list of set bindings
334 * @name: name of the set
335 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
336 * @dtype: data type (verdict or numeric type defined by userspace)
337 * @objtype: object type (see NFT_OBJECT_* definitions)
338 * @size: maximum set size
339 * @nelems: number of elements
340 * @ndeact: number of deactivated elements queued for removal
341 * @timeout: default timeout value in jiffies
342 * @gc_int: garbage collection interval in msecs
343 * @policy: set parameterization (see enum nft_set_policies)
344 * @udlen: user data length
348 * @genmask: generation mask
351 * @data: private set data
354 struct list_head list
;
355 struct list_head bindings
;
356 char name
[NFT_SET_MAXNAMELEN
];
367 unsigned char *udata
;
368 /* runtime data below here */
369 const struct nft_set_ops
*ops ____cacheline_aligned
;
375 __attribute__((aligned(__alignof__(u64
))));
378 static inline void *nft_set_priv(const struct nft_set
*set
)
380 return (void *)set
->data
;
383 static inline struct nft_set
*nft_set_container_of(const void *priv
)
385 return (void *)priv
- offsetof(struct nft_set
, data
);
388 struct nft_set
*nft_set_lookup(const struct net
*net
,
389 const struct nft_table
*table
,
390 const struct nlattr
*nla_set_name
,
391 const struct nlattr
*nla_set_id
,
394 static inline unsigned long nft_set_gc_interval(const struct nft_set
*set
)
396 return set
->gc_int
? msecs_to_jiffies(set
->gc_int
) : HZ
;
400 * struct nft_set_binding - nf_tables set binding
402 * @list: set bindings list node
403 * @chain: chain containing the rule bound to the set
404 * @flags: set action flags
406 * A set binding contains all information necessary for validation
407 * of new elements added to a bound set.
409 struct nft_set_binding
{
410 struct list_head list
;
411 const struct nft_chain
*chain
;
415 int nf_tables_bind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
416 struct nft_set_binding
*binding
);
417 void nf_tables_unbind_set(const struct nft_ctx
*ctx
, struct nft_set
*set
,
418 struct nft_set_binding
*binding
);
421 * enum nft_set_extensions - set extension type IDs
423 * @NFT_SET_EXT_KEY: element key
424 * @NFT_SET_EXT_DATA: mapping data
425 * @NFT_SET_EXT_FLAGS: element flags
426 * @NFT_SET_EXT_TIMEOUT: element timeout
427 * @NFT_SET_EXT_EXPIRATION: element expiration time
428 * @NFT_SET_EXT_USERDATA: user data associated with the element
429 * @NFT_SET_EXT_EXPR: expression assiociated with the element
430 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
431 * @NFT_SET_EXT_NUM: number of extension types
433 enum nft_set_extensions
{
438 NFT_SET_EXT_EXPIRATION
,
439 NFT_SET_EXT_USERDATA
,
446 * struct nft_set_ext_type - set extension type
448 * @len: fixed part length of the extension
449 * @align: alignment requirements of the extension
451 struct nft_set_ext_type
{
456 extern const struct nft_set_ext_type nft_set_ext_types
[];
459 * struct nft_set_ext_tmpl - set extension template
461 * @len: length of extension area
462 * @offset: offsets of individual extension types
464 struct nft_set_ext_tmpl
{
466 u8 offset
[NFT_SET_EXT_NUM
];
470 * struct nft_set_ext - set extensions
472 * @genmask: generation mask
473 * @offset: offsets of individual extension types
474 * @data: beginning of extension data
478 u8 offset
[NFT_SET_EXT_NUM
];
482 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl
*tmpl
)
484 memset(tmpl
, 0, sizeof(*tmpl
));
485 tmpl
->len
= sizeof(struct nft_set_ext
);
488 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl
*tmpl
, u8 id
,
491 tmpl
->len
= ALIGN(tmpl
->len
, nft_set_ext_types
[id
].align
);
492 BUG_ON(tmpl
->len
> U8_MAX
);
493 tmpl
->offset
[id
] = tmpl
->len
;
494 tmpl
->len
+= nft_set_ext_types
[id
].len
+ len
;
497 static inline void nft_set_ext_add(struct nft_set_ext_tmpl
*tmpl
, u8 id
)
499 nft_set_ext_add_length(tmpl
, id
, 0);
502 static inline void nft_set_ext_init(struct nft_set_ext
*ext
,
503 const struct nft_set_ext_tmpl
*tmpl
)
505 memcpy(ext
->offset
, tmpl
->offset
, sizeof(ext
->offset
));
508 static inline bool __nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
510 return !!ext
->offset
[id
];
513 static inline bool nft_set_ext_exists(const struct nft_set_ext
*ext
, u8 id
)
515 return ext
&& __nft_set_ext_exists(ext
, id
);
518 static inline void *nft_set_ext(const struct nft_set_ext
*ext
, u8 id
)
520 return (void *)ext
+ ext
->offset
[id
];
523 static inline struct nft_data
*nft_set_ext_key(const struct nft_set_ext
*ext
)
525 return nft_set_ext(ext
, NFT_SET_EXT_KEY
);
528 static inline struct nft_data
*nft_set_ext_data(const struct nft_set_ext
*ext
)
530 return nft_set_ext(ext
, NFT_SET_EXT_DATA
);
533 static inline u8
*nft_set_ext_flags(const struct nft_set_ext
*ext
)
535 return nft_set_ext(ext
, NFT_SET_EXT_FLAGS
);
538 static inline u64
*nft_set_ext_timeout(const struct nft_set_ext
*ext
)
540 return nft_set_ext(ext
, NFT_SET_EXT_TIMEOUT
);
543 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext
*ext
)
545 return nft_set_ext(ext
, NFT_SET_EXT_EXPIRATION
);
548 static inline struct nft_userdata
*nft_set_ext_userdata(const struct nft_set_ext
*ext
)
550 return nft_set_ext(ext
, NFT_SET_EXT_USERDATA
);
553 static inline struct nft_expr
*nft_set_ext_expr(const struct nft_set_ext
*ext
)
555 return nft_set_ext(ext
, NFT_SET_EXT_EXPR
);
558 static inline bool nft_set_elem_expired(const struct nft_set_ext
*ext
)
560 return nft_set_ext_exists(ext
, NFT_SET_EXT_EXPIRATION
) &&
561 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext
));
564 static inline struct nft_set_ext
*nft_set_elem_ext(const struct nft_set
*set
,
567 return elem
+ set
->ops
->elemsize
;
570 static inline struct nft_object
**nft_set_ext_obj(const struct nft_set_ext
*ext
)
572 return nft_set_ext(ext
, NFT_SET_EXT_OBJREF
);
575 void *nft_set_elem_init(const struct nft_set
*set
,
576 const struct nft_set_ext_tmpl
*tmpl
,
577 const u32
*key
, const u32
*data
,
578 u64 timeout
, gfp_t gfp
);
579 void nft_set_elem_destroy(const struct nft_set
*set
, void *elem
,
583 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
586 * @set: set the elements belong to
587 * @cnt: count of elements
589 struct nft_set_gc_batch_head
{
591 const struct nft_set
*set
;
595 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
596 sizeof(struct nft_set_gc_batch_head)) / \
600 * struct nft_set_gc_batch - nf_tables set garbage collection batch
602 * @head: GC batch head
603 * @elems: garbage collection elements
605 struct nft_set_gc_batch
{
606 struct nft_set_gc_batch_head head
;
607 void *elems
[NFT_SET_GC_BATCH_SIZE
];
610 struct nft_set_gc_batch
*nft_set_gc_batch_alloc(const struct nft_set
*set
,
612 void nft_set_gc_batch_release(struct rcu_head
*rcu
);
614 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch
*gcb
)
617 call_rcu(&gcb
->head
.rcu
, nft_set_gc_batch_release
);
620 static inline struct nft_set_gc_batch
*
621 nft_set_gc_batch_check(const struct nft_set
*set
, struct nft_set_gc_batch
*gcb
,
625 if (gcb
->head
.cnt
+ 1 < ARRAY_SIZE(gcb
->elems
))
627 nft_set_gc_batch_complete(gcb
);
629 return nft_set_gc_batch_alloc(set
, gfp
);
632 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch
*gcb
,
635 gcb
->elems
[gcb
->head
.cnt
++] = elem
;
639 * struct nft_expr_type - nf_tables expression type
641 * @select_ops: function to select nft_expr_ops
642 * @ops: default ops, used when no select_ops functions is present
643 * @list: used internally
645 * @owner: module reference
646 * @policy: netlink attribute policy
647 * @maxattr: highest netlink attribute number
648 * @family: address family for AF-specific types
649 * @flags: expression type flags
651 struct nft_expr_type
{
652 const struct nft_expr_ops
*(*select_ops
)(const struct nft_ctx
*,
653 const struct nlattr
* const tb
[]);
654 const struct nft_expr_ops
*ops
;
655 struct list_head list
;
657 struct module
*owner
;
658 const struct nla_policy
*policy
;
659 unsigned int maxattr
;
664 #define NFT_EXPR_STATEFUL 0x1
667 * struct nft_expr_ops - nf_tables expression operations
669 * @eval: Expression evaluation function
670 * @size: full expression size, including private data size
671 * @init: initialization function
672 * @destroy: destruction function
673 * @dump: function to dump parameters
674 * @type: expression type
675 * @validate: validate expression, called during loop detection
676 * @data: extra data to attach to this expression operation
679 struct nft_expr_ops
{
680 void (*eval
)(const struct nft_expr
*expr
,
681 struct nft_regs
*regs
,
682 const struct nft_pktinfo
*pkt
);
683 int (*clone
)(struct nft_expr
*dst
,
684 const struct nft_expr
*src
);
687 int (*init
)(const struct nft_ctx
*ctx
,
688 const struct nft_expr
*expr
,
689 const struct nlattr
* const tb
[]);
690 void (*destroy
)(const struct nft_ctx
*ctx
,
691 const struct nft_expr
*expr
);
692 int (*dump
)(struct sk_buff
*skb
,
693 const struct nft_expr
*expr
);
694 int (*validate
)(const struct nft_ctx
*ctx
,
695 const struct nft_expr
*expr
,
696 const struct nft_data
**data
);
697 const struct nft_expr_type
*type
;
701 #define NFT_EXPR_MAXATTR 16
702 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
703 ALIGN(size, __alignof__(struct nft_expr)))
706 * struct nft_expr - nf_tables expression
708 * @ops: expression ops
709 * @data: expression private data
712 const struct nft_expr_ops
*ops
;
713 unsigned char data
[];
716 static inline void *nft_expr_priv(const struct nft_expr
*expr
)
718 return (void *)expr
->data
;
721 struct nft_expr
*nft_expr_init(const struct nft_ctx
*ctx
,
722 const struct nlattr
*nla
);
723 void nft_expr_destroy(const struct nft_ctx
*ctx
, struct nft_expr
*expr
);
724 int nft_expr_dump(struct sk_buff
*skb
, unsigned int attr
,
725 const struct nft_expr
*expr
);
727 static inline int nft_expr_clone(struct nft_expr
*dst
, struct nft_expr
*src
)
731 if (src
->ops
->clone
) {
733 err
= src
->ops
->clone(dst
, src
);
737 memcpy(dst
, src
, src
->ops
->size
);
740 __module_get(src
->ops
->type
->owner
);
745 * struct nft_rule - nf_tables rule
747 * @list: used internally
748 * @handle: rule handle
749 * @genmask: generation mask
750 * @dlen: length of expression data
751 * @udata: user data is appended to the rule
752 * @data: expression data
755 struct list_head list
;
761 __attribute__((aligned(__alignof__(struct nft_expr
))));
764 static inline struct nft_expr
*nft_expr_first(const struct nft_rule
*rule
)
766 return (struct nft_expr
*)&rule
->data
[0];
769 static inline struct nft_expr
*nft_expr_next(const struct nft_expr
*expr
)
771 return ((void *)expr
) + expr
->ops
->size
;
774 static inline struct nft_expr
*nft_expr_last(const struct nft_rule
*rule
)
776 return (struct nft_expr
*)&rule
->data
[rule
->dlen
];
779 static inline struct nft_userdata
*nft_userdata(const struct nft_rule
*rule
)
781 return (void *)&rule
->data
[rule
->dlen
];
785 * The last pointer isn't really necessary, but the compiler isn't able to
786 * determine that the result of nft_expr_last() is always the same since it
787 * can't assume that the dlen value wasn't changed within calls in the loop.
789 #define nft_rule_for_each_expr(expr, last, rule) \
790 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
792 (expr) = nft_expr_next(expr))
794 enum nft_chain_flags
{
795 NFT_BASE_CHAIN
= 0x1,
799 * struct nft_chain - nf_tables chain
801 * @rules: list of rules in the chain
802 * @list: used internally
803 * @table: table that this chain belongs to
804 * @handle: chain handle
805 * @use: number of jump references to this chain
806 * @level: length of longest path to this chain
807 * @flags: bitmask of enum nft_chain_flags
808 * @name: name of the chain
811 struct list_head rules
;
812 struct list_head list
;
813 struct nft_table
*table
;
819 char name
[NFT_CHAIN_MAXNAMELEN
];
822 enum nft_chain_type
{
823 NFT_CHAIN_T_DEFAULT
= 0,
830 * struct nf_chain_type - nf_tables chain type info
832 * @name: name of the type
833 * @type: numeric identifier
834 * @family: address family
835 * @owner: module owner
836 * @hook_mask: mask of valid hooks
837 * @hooks: hookfn overrides
839 struct nf_chain_type
{
841 enum nft_chain_type type
;
843 struct module
*owner
;
844 unsigned int hook_mask
;
845 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
848 int nft_chain_validate_dependency(const struct nft_chain
*chain
,
849 enum nft_chain_type type
);
850 int nft_chain_validate_hooks(const struct nft_chain
*chain
,
851 unsigned int hook_flags
);
856 struct u64_stats_sync syncp
;
859 #define NFT_HOOK_OPS_MAX 2
862 * struct nft_base_chain - nf_tables base chain
864 * @ops: netfilter hook ops
866 * @policy: default policy
867 * @stats: per-cpu chain stats
869 * @dev_name: device name that this base chain is attached to (if any)
871 struct nft_base_chain
{
872 struct nf_hook_ops ops
[NFT_HOOK_OPS_MAX
];
873 const struct nf_chain_type
*type
;
876 struct nft_stats __percpu
*stats
;
877 struct nft_chain chain
;
878 char dev_name
[IFNAMSIZ
];
881 static inline struct nft_base_chain
*nft_base_chain(const struct nft_chain
*chain
)
883 return container_of(chain
, struct nft_base_chain
, chain
);
886 int __nft_release_basechain(struct nft_ctx
*ctx
);
888 unsigned int nft_do_chain(struct nft_pktinfo
*pkt
, void *priv
);
891 * struct nft_table - nf_tables table
893 * @list: used internally
894 * @chains: chains in the table
895 * @sets: sets in the table
896 * @objects: stateful objects in the table
897 * @hgenerator: handle generator state
898 * @use: number of chain references to this table
899 * @flags: table flag (see enum nft_table_flags)
900 * @genmask: generation mask
901 * @name: name of the table
904 struct list_head list
;
905 struct list_head chains
;
906 struct list_head sets
;
907 struct list_head objects
;
912 char name
[NFT_TABLE_MAXNAMELEN
];
916 NFT_AF_NEEDS_DEV
= (1 << 0),
920 * struct nft_af_info - nf_tables address family info
922 * @list: used internally
923 * @family: address family
924 * @nhooks: number of hooks in this family
925 * @owner: module owner
926 * @tables: used internally
927 * @flags: family flags
928 * @nops: number of hook ops in this family
929 * @hook_ops_init: initialization function for chain hook ops
930 * @hooks: hookfn overrides for packet validation
933 struct list_head list
;
936 struct module
*owner
;
937 struct list_head tables
;
940 void (*hook_ops_init
)(struct nf_hook_ops
*,
942 nf_hookfn
*hooks
[NF_MAX_HOOKS
];
945 int nft_register_afinfo(struct net
*, struct nft_af_info
*);
946 void nft_unregister_afinfo(struct net
*, struct nft_af_info
*);
948 int nft_register_chain_type(const struct nf_chain_type
*);
949 void nft_unregister_chain_type(const struct nf_chain_type
*);
951 int nft_register_expr(struct nft_expr_type
*);
952 void nft_unregister_expr(struct nft_expr_type
*);
954 int nft_verdict_dump(struct sk_buff
*skb
, int type
,
955 const struct nft_verdict
*v
);
958 * struct nft_object - nf_tables stateful object
960 * @list: table stateful object list node
961 * @table: table this object belongs to
962 * @type: pointer to object type
963 * @data: pointer to object data
964 * @name: name of this stateful object
965 * @genmask: generation mask
966 * @use: number of references to this stateful object
967 * @data: object data, layout depends on type
970 struct list_head list
;
971 char name
[NFT_OBJ_MAXNAMELEN
];
972 struct nft_table
*table
;
975 /* runtime data below here */
976 const struct nft_object_type
*type ____cacheline_aligned
;
978 __attribute__((aligned(__alignof__(u64
))));
981 static inline void *nft_obj_data(const struct nft_object
*obj
)
983 return (void *)obj
->data
;
986 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
988 struct nft_object
*nf_tables_obj_lookup(const struct nft_table
*table
,
989 const struct nlattr
*nla
, u32 objtype
,
992 void nft_obj_notify(struct net
*net
, struct nft_table
*table
,
993 struct nft_object
*obj
, u32 portid
, u32 seq
,
994 int event
, int family
, int report
, gfp_t gfp
);
997 * struct nft_object_type - stateful object type
999 * @eval: stateful object evaluation function
1000 * @list: list node in list of object types
1001 * @type: stateful object numeric type
1002 * @size: stateful object size
1003 * @owner: module owner
1004 * @maxattr: maximum netlink attribute
1005 * @policy: netlink attribute policy
1006 * @init: initialize object from netlink attributes
1007 * @destroy: release existing stateful object
1008 * @dump: netlink dump stateful object
1010 struct nft_object_type
{
1011 void (*eval
)(struct nft_object
*obj
,
1012 struct nft_regs
*regs
,
1013 const struct nft_pktinfo
*pkt
);
1014 struct list_head list
;
1017 unsigned int maxattr
;
1018 struct module
*owner
;
1019 const struct nla_policy
*policy
;
1020 int (*init
)(const struct nlattr
* const tb
[],
1021 struct nft_object
*obj
);
1022 void (*destroy
)(struct nft_object
*obj
);
1023 int (*dump
)(struct sk_buff
*skb
,
1024 struct nft_object
*obj
,
1028 int nft_register_obj(struct nft_object_type
*obj_type
);
1029 void nft_unregister_obj(struct nft_object_type
*obj_type
);
1032 * struct nft_traceinfo - nft tracing information and state
1034 * @pkt: pktinfo currently processed
1035 * @basechain: base chain currently processed
1036 * @chain: chain currently processed
1037 * @rule: rule that was evaluated
1038 * @verdict: verdict given by rule
1039 * @type: event type (enum nft_trace_types)
1040 * @packet_dumped: packet headers sent in a previous traceinfo message
1041 * @trace: other struct members are initialised
1043 struct nft_traceinfo
{
1044 const struct nft_pktinfo
*pkt
;
1045 const struct nft_base_chain
*basechain
;
1046 const struct nft_chain
*chain
;
1047 const struct nft_rule
*rule
;
1048 const struct nft_verdict
*verdict
;
1049 enum nft_trace_types type
;
1054 void nft_trace_init(struct nft_traceinfo
*info
, const struct nft_pktinfo
*pkt
,
1055 const struct nft_verdict
*verdict
,
1056 const struct nft_chain
*basechain
);
1058 void nft_trace_notify(struct nft_traceinfo
*info
);
1060 #define nft_dereference(p) \
1061 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
1063 #define MODULE_ALIAS_NFT_FAMILY(family) \
1064 MODULE_ALIAS("nft-afinfo-" __stringify(family))
1066 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1067 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1069 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1070 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1072 #define MODULE_ALIAS_NFT_EXPR(name) \
1073 MODULE_ALIAS("nft-expr-" name)
1075 #define MODULE_ALIAS_NFT_SET() \
1076 MODULE_ALIAS("nft-set")
1078 #define MODULE_ALIAS_NFT_OBJ(type) \
1079 MODULE_ALIAS("nft-obj-" __stringify(type))
1082 * The gencursor defines two generations, the currently active and the
1083 * next one. Objects contain a bitmask of 2 bits specifying the generations
1084 * they're active in. A set bit means they're inactive in the generation
1085 * represented by that bit.
1087 * New objects start out as inactive in the current and active in the
1088 * next generation. When committing the ruleset the bitmask is cleared,
1089 * meaning they're active in all generations. When removing an object,
1090 * it is set inactive in the next generation. After committing the ruleset,
1091 * the objects are removed.
1093 static inline unsigned int nft_gencursor_next(const struct net
*net
)
1095 return net
->nft
.gencursor
+ 1 == 1 ? 1 : 0;
1098 static inline u8
nft_genmask_next(const struct net
*net
)
1100 return 1 << nft_gencursor_next(net
);
1103 static inline u8
nft_genmask_cur(const struct net
*net
)
1105 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
1106 return 1 << ACCESS_ONCE(net
->nft
.gencursor
);
1109 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1112 * Generic transaction helpers
1115 /* Check if this object is currently active. */
1116 #define nft_is_active(__net, __obj) \
1117 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1119 /* Check if this object is active in the next generation. */
1120 #define nft_is_active_next(__net, __obj) \
1121 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1123 /* This object becomes active in the next generation. */
1124 #define nft_activate_next(__net, __obj) \
1125 (__obj)->genmask = nft_genmask_cur(__net)
1127 /* This object becomes inactive in the next generation. */
1128 #define nft_deactivate_next(__net, __obj) \
1129 (__obj)->genmask = nft_genmask_next(__net)
1131 /* After committing the ruleset, clear the stale generation bit. */
1132 #define nft_clear(__net, __obj) \
1133 (__obj)->genmask &= ~nft_genmask_next(__net)
1134 #define nft_active_genmask(__obj, __genmask) \
1135 !((__obj)->genmask & __genmask)
1138 * Set element transaction helpers
1141 static inline bool nft_set_elem_active(const struct nft_set_ext
*ext
,
1144 return !(ext
->genmask
& genmask
);
1147 static inline void nft_set_elem_change_active(const struct net
*net
,
1148 const struct nft_set
*set
,
1149 struct nft_set_ext
*ext
)
1151 ext
->genmask
^= nft_genmask_next(net
);
1155 * We use a free bit in the genmask field to indicate the element
1156 * is busy, meaning it is currently being processed either by
1157 * the netlink API or GC.
1159 * Even though the genmask is only a single byte wide, this works
1160 * because the extension structure if fully constant once initialized,
1161 * so there are no non-atomic write accesses unless it is already
1164 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1166 #if defined(__LITTLE_ENDIAN_BITFIELD)
1167 #define NFT_SET_ELEM_BUSY_BIT 2
1168 #elif defined(__BIG_ENDIAN_BITFIELD)
1169 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1174 static inline int nft_set_elem_mark_busy(struct nft_set_ext
*ext
)
1176 unsigned long *word
= (unsigned long *)ext
;
1178 BUILD_BUG_ON(offsetof(struct nft_set_ext
, genmask
) != 0);
1179 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
1182 static inline void nft_set_elem_clear_busy(struct nft_set_ext
*ext
)
1184 unsigned long *word
= (unsigned long *)ext
;
1186 clear_bit(NFT_SET_ELEM_BUSY_BIT
, word
);
1190 * struct nft_trans - nf_tables object update in transaction
1192 * @list: used internally
1193 * @msg_type: message type
1194 * @ctx: transaction context
1195 * @data: internal information related to the transaction
1198 struct list_head list
;
1204 struct nft_trans_rule
{
1205 struct nft_rule
*rule
;
1209 #define nft_trans_rule(trans) \
1210 (((struct nft_trans_rule *)trans->data)->rule)
1211 #define nft_trans_rule_id(trans) \
1212 (((struct nft_trans_rule *)trans->data)->rule_id)
1214 struct nft_trans_set
{
1215 struct nft_set
*set
;
1219 #define nft_trans_set(trans) \
1220 (((struct nft_trans_set *)trans->data)->set)
1221 #define nft_trans_set_id(trans) \
1222 (((struct nft_trans_set *)trans->data)->set_id)
1224 struct nft_trans_chain
{
1226 char name
[NFT_CHAIN_MAXNAMELEN
];
1227 struct nft_stats __percpu
*stats
;
1231 #define nft_trans_chain_update(trans) \
1232 (((struct nft_trans_chain *)trans->data)->update)
1233 #define nft_trans_chain_name(trans) \
1234 (((struct nft_trans_chain *)trans->data)->name)
1235 #define nft_trans_chain_stats(trans) \
1236 (((struct nft_trans_chain *)trans->data)->stats)
1237 #define nft_trans_chain_policy(trans) \
1238 (((struct nft_trans_chain *)trans->data)->policy)
1240 struct nft_trans_table
{
1245 #define nft_trans_table_update(trans) \
1246 (((struct nft_trans_table *)trans->data)->update)
1247 #define nft_trans_table_enable(trans) \
1248 (((struct nft_trans_table *)trans->data)->enable)
1250 struct nft_trans_elem
{
1251 struct nft_set
*set
;
1252 struct nft_set_elem elem
;
1255 #define nft_trans_elem_set(trans) \
1256 (((struct nft_trans_elem *)trans->data)->set)
1257 #define nft_trans_elem(trans) \
1258 (((struct nft_trans_elem *)trans->data)->elem)
1260 struct nft_trans_obj
{
1261 struct nft_object
*obj
;
1264 #define nft_trans_obj(trans) \
1265 (((struct nft_trans_obj *)trans->data)->obj)
1267 #endif /* _NET_NF_TABLES_H */