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 /* Store/load an u16 or u8 integer to/from the u32 data register.
108 * Note, when using concatenations, register allocation happens at 32-bit
109 * level. So for store instruction, pad the rest part with zero to avoid
113 static inline void nft_reg_store16(u32 *dreg, u16 val)
119 static inline void nft_reg_store8(u32 *dreg, u8 val)
125 static inline u16 nft_reg_load16(u32 *sreg)
130 static inline u8 nft_reg_load8(u32 *sreg)
135 static inline void nft_data_copy(u32 *dst, const struct nft_data *src,
138 memcpy(dst, src, len);
141 static inline void nft_data_debug(const struct nft_data *data)
143 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
144 data->data[0], data->data[1],
145 data->data[2], data->data[3]);
149 * struct nft_ctx - nf_tables rule/set context
151 * @net: net namespace
152 * @afi: address family info
153 * @table: the table the chain is contained in
154 * @chain: the chain the rule is contained in
155 * @nla: netlink attributes
156 * @portid: netlink portID of the original message
157 * @seq: netlink sequence number
158 * @report: notify via unicast netlink message
162 struct nft_af_info *afi;
163 struct nft_table *table;
164 struct nft_chain *chain;
165 const struct nlattr * const *nla;
171 struct nft_data_desc {
172 enum nft_data_types type;
176 int nft_data_init(const struct nft_ctx *ctx,
177 struct nft_data *data, unsigned int size,
178 struct nft_data_desc *desc, const struct nlattr *nla);
179 void nft_data_release(const struct nft_data *data, enum nft_data_types type);
180 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
181 enum nft_data_types type, unsigned int len);
183 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
185 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
188 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
190 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE;
193 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest);
194 unsigned int nft_parse_register(const struct nlattr *attr);
195 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg);
197 int nft_validate_register_load(enum nft_registers reg, unsigned int len);
198 int nft_validate_register_store(const struct nft_ctx *ctx,
199 enum nft_registers reg,
200 const struct nft_data *data,
201 enum nft_data_types type, unsigned int len);
204 * struct nft_userdata - user defined data associated with an object
206 * @len: length of the data
209 * The presence of user data is indicated in an object specific fashion,
210 * so a length of zero can't occur and the value "len" indicates data
213 struct nft_userdata {
215 unsigned char data[0];
219 * struct nft_set_elem - generic representation of set elements
222 * @priv: element private data and extensions
224 struct nft_set_elem {
226 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)];
233 struct nft_set_iter {
238 int (*fn)(const struct nft_ctx *ctx,
240 const struct nft_set_iter *iter,
241 struct nft_set_elem *elem);
245 * struct nft_set_desc - description of set elements
249 * @size: number of set elements
251 struct nft_set_desc {
258 * enum nft_set_class - performance class
260 * @NFT_LOOKUP_O_1: constant, O(1)
261 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
262 * @NFT_LOOKUP_O_N: linear, O(N)
266 NFT_SET_CLASS_O_LOG_N,
271 * struct nft_set_estimate - estimation of memory and performance
274 * @size: required memory
275 * @lookup: lookup performance class
276 * @space: memory class
278 struct nft_set_estimate {
280 enum nft_set_class lookup;
281 enum nft_set_class space;
285 * struct nft_set_type - nf_tables set type
287 * @select_ops: function to select nft_set_ops
288 * @ops: default ops, used when no select_ops functions is present
289 * @list: used internally
290 * @owner: module reference
292 struct nft_set_type {
293 const struct nft_set_ops *(*select_ops)(const struct nft_ctx *,
294 const struct nft_set_desc *desc,
296 const struct nft_set_ops *ops;
297 struct list_head list;
298 struct module *owner;
305 * struct nft_set_ops - nf_tables set operations
307 * @lookup: look up an element within the set
308 * @insert: insert new element into set
309 * @activate: activate new element in the next generation
310 * @deactivate: lookup for element and deactivate it in the next generation
311 * @flush: deactivate element in the next generation
312 * @remove: remove element from set
313 * @walk: iterate over all set elemeennts
314 * @privsize: function to return size of set private data
315 * @init: initialize private data of new set instance
316 * @destroy: destroy private data of set instance
317 * @elemsize: element private size
318 * @features: features supported by the implementation
321 bool (*lookup)(const struct net *net,
322 const struct nft_set *set,
324 const struct nft_set_ext **ext);
325 bool (*update)(struct nft_set *set,
327 void *(*new)(struct nft_set *,
328 const struct nft_expr *,
330 const struct nft_expr *expr,
331 struct nft_regs *regs,
332 const struct nft_set_ext **ext);
334 int (*insert)(const struct net *net,
335 const struct nft_set *set,
336 const struct nft_set_elem *elem,
337 struct nft_set_ext **ext);
338 void (*activate)(const struct net *net,
339 const struct nft_set *set,
340 const struct nft_set_elem *elem);
341 void * (*deactivate)(const struct net *net,
342 const struct nft_set *set,
343 const struct nft_set_elem *elem);
344 bool (*flush)(const struct net *net,
345 const struct nft_set *set,
347 void (*remove)(const struct net *net,
348 const struct nft_set *set,
349 const struct nft_set_elem *elem);
350 void (*walk)(const struct nft_ctx *ctx,
352 struct nft_set_iter *iter);
354 unsigned int (*privsize)(const struct nlattr * const nla[],
355 const struct nft_set_desc *desc);
356 bool (*estimate)(const struct nft_set_desc *desc,
358 struct nft_set_estimate *est);
359 int (*init)(const struct nft_set *set,
360 const struct nft_set_desc *desc,
361 const struct nlattr * const nla[]);
362 void (*destroy)(const struct nft_set *set);
364 unsigned int elemsize;
366 const struct nft_set_type *type;
369 int nft_register_set(struct nft_set_type *type);
370 void nft_unregister_set(struct nft_set_type *type);
373 * struct nft_set - nf_tables set instance
375 * @list: table set list node
376 * @bindings: list of set bindings
377 * @name: name of the set
378 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
379 * @dtype: data type (verdict or numeric type defined by userspace)
380 * @objtype: object type (see NFT_OBJECT_* definitions)
381 * @size: maximum set size
382 * @nelems: number of elements
383 * @ndeact: number of deactivated elements queued for removal
384 * @timeout: default timeout value in jiffies
385 * @gc_int: garbage collection interval in msecs
386 * @policy: set parameterization (see enum nft_set_policies)
387 * @udlen: user data length
391 * @genmask: generation mask
394 * @data: private set data
397 struct list_head list;
398 struct list_head bindings;
399 char name[NFT_SET_MAXNAMELEN];
410 unsigned char *udata;
411 /* runtime data below here */
412 const struct nft_set_ops *ops ____cacheline_aligned;
418 __attribute__((aligned(__alignof__(u64))));
421 static inline void *nft_set_priv(const struct nft_set *set)
423 return (void *)set->data;
426 static inline struct nft_set *nft_set_container_of(const void *priv)
428 return (void *)priv - offsetof(struct nft_set, data);
431 struct nft_set *nft_set_lookup(const struct net *net,
432 const struct nft_table *table,
433 const struct nlattr *nla_set_name,
434 const struct nlattr *nla_set_id,
437 static inline unsigned long nft_set_gc_interval(const struct nft_set *set)
439 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ;
443 * struct nft_set_binding - nf_tables set binding
445 * @list: set bindings list node
446 * @chain: chain containing the rule bound to the set
447 * @flags: set action flags
449 * A set binding contains all information necessary for validation
450 * of new elements added to a bound set.
452 struct nft_set_binding {
453 struct list_head list;
454 const struct nft_chain *chain;
458 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
459 struct nft_set_binding *binding);
460 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
461 struct nft_set_binding *binding);
464 * enum nft_set_extensions - set extension type IDs
466 * @NFT_SET_EXT_KEY: element key
467 * @NFT_SET_EXT_DATA: mapping data
468 * @NFT_SET_EXT_FLAGS: element flags
469 * @NFT_SET_EXT_TIMEOUT: element timeout
470 * @NFT_SET_EXT_EXPIRATION: element expiration time
471 * @NFT_SET_EXT_USERDATA: user data associated with the element
472 * @NFT_SET_EXT_EXPR: expression assiociated with the element
473 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element
474 * @NFT_SET_EXT_NUM: number of extension types
476 enum nft_set_extensions {
481 NFT_SET_EXT_EXPIRATION,
482 NFT_SET_EXT_USERDATA,
489 * struct nft_set_ext_type - set extension type
491 * @len: fixed part length of the extension
492 * @align: alignment requirements of the extension
494 struct nft_set_ext_type {
499 extern const struct nft_set_ext_type nft_set_ext_types[];
502 * struct nft_set_ext_tmpl - set extension template
504 * @len: length of extension area
505 * @offset: offsets of individual extension types
507 struct nft_set_ext_tmpl {
509 u8 offset[NFT_SET_EXT_NUM];
513 * struct nft_set_ext - set extensions
515 * @genmask: generation mask
516 * @offset: offsets of individual extension types
517 * @data: beginning of extension data
521 u8 offset[NFT_SET_EXT_NUM];
525 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl)
527 memset(tmpl, 0, sizeof(*tmpl));
528 tmpl->len = sizeof(struct nft_set_ext);
531 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id,
534 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align);
535 BUG_ON(tmpl->len > U8_MAX);
536 tmpl->offset[id] = tmpl->len;
537 tmpl->len += nft_set_ext_types[id].len + len;
540 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id)
542 nft_set_ext_add_length(tmpl, id, 0);
545 static inline void nft_set_ext_init(struct nft_set_ext *ext,
546 const struct nft_set_ext_tmpl *tmpl)
548 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset));
551 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
553 return !!ext->offset[id];
556 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id)
558 return ext && __nft_set_ext_exists(ext, id);
561 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id)
563 return (void *)ext + ext->offset[id];
566 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext)
568 return nft_set_ext(ext, NFT_SET_EXT_KEY);
571 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext)
573 return nft_set_ext(ext, NFT_SET_EXT_DATA);
576 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext)
578 return nft_set_ext(ext, NFT_SET_EXT_FLAGS);
581 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext)
583 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT);
586 static inline unsigned long *nft_set_ext_expiration(const struct nft_set_ext *ext)
588 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION);
591 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext)
593 return nft_set_ext(ext, NFT_SET_EXT_USERDATA);
596 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext)
598 return nft_set_ext(ext, NFT_SET_EXT_EXPR);
601 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext)
603 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) &&
604 time_is_before_eq_jiffies(*nft_set_ext_expiration(ext));
607 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set,
610 return elem + set->ops->elemsize;
613 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext)
615 return nft_set_ext(ext, NFT_SET_EXT_OBJREF);
618 void *nft_set_elem_init(const struct nft_set *set,
619 const struct nft_set_ext_tmpl *tmpl,
620 const u32 *key, const u32 *data,
621 u64 timeout, gfp_t gfp);
622 void nft_set_elem_destroy(const struct nft_set *set, void *elem,
626 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch
629 * @set: set the elements belong to
630 * @cnt: count of elements
632 struct nft_set_gc_batch_head {
634 const struct nft_set *set;
638 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \
639 sizeof(struct nft_set_gc_batch_head)) / \
643 * struct nft_set_gc_batch - nf_tables set garbage collection batch
645 * @head: GC batch head
646 * @elems: garbage collection elements
648 struct nft_set_gc_batch {
649 struct nft_set_gc_batch_head head;
650 void *elems[NFT_SET_GC_BATCH_SIZE];
653 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set,
655 void nft_set_gc_batch_release(struct rcu_head *rcu);
657 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb)
660 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release);
663 static inline struct nft_set_gc_batch *
664 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb,
668 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems))
670 nft_set_gc_batch_complete(gcb);
672 return nft_set_gc_batch_alloc(set, gfp);
675 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
678 gcb->elems[gcb->head.cnt++] = elem;
682 * struct nft_expr_type - nf_tables expression type
684 * @select_ops: function to select nft_expr_ops
685 * @ops: default ops, used when no select_ops functions is present
686 * @list: used internally
688 * @owner: module reference
689 * @policy: netlink attribute policy
690 * @maxattr: highest netlink attribute number
691 * @family: address family for AF-specific types
692 * @flags: expression type flags
694 struct nft_expr_type {
695 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
696 const struct nlattr * const tb[]);
697 const struct nft_expr_ops *ops;
698 struct list_head list;
700 struct module *owner;
701 const struct nla_policy *policy;
702 unsigned int maxattr;
707 #define NFT_EXPR_STATEFUL 0x1
710 * struct nft_expr_ops - nf_tables expression operations
712 * @eval: Expression evaluation function
713 * @size: full expression size, including private data size
714 * @init: initialization function
715 * @destroy: destruction function
716 * @dump: function to dump parameters
717 * @type: expression type
718 * @validate: validate expression, called during loop detection
719 * @data: extra data to attach to this expression operation
722 struct nft_expr_ops {
723 void (*eval)(const struct nft_expr *expr,
724 struct nft_regs *regs,
725 const struct nft_pktinfo *pkt);
726 int (*clone)(struct nft_expr *dst,
727 const struct nft_expr *src);
730 int (*init)(const struct nft_ctx *ctx,
731 const struct nft_expr *expr,
732 const struct nlattr * const tb[]);
733 void (*destroy)(const struct nft_ctx *ctx,
734 const struct nft_expr *expr);
735 int (*dump)(struct sk_buff *skb,
736 const struct nft_expr *expr);
737 int (*validate)(const struct nft_ctx *ctx,
738 const struct nft_expr *expr,
739 const struct nft_data **data);
740 const struct nft_expr_type *type;
744 #define NFT_EXPR_MAXATTR 16
745 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
746 ALIGN(size, __alignof__(struct nft_expr)))
749 * struct nft_expr - nf_tables expression
751 * @ops: expression ops
752 * @data: expression private data
755 const struct nft_expr_ops *ops;
756 unsigned char data[];
759 static inline void *nft_expr_priv(const struct nft_expr *expr)
761 return (void *)expr->data;
764 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx,
765 const struct nlattr *nla);
766 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr);
767 int nft_expr_dump(struct sk_buff *skb, unsigned int attr,
768 const struct nft_expr *expr);
770 static inline int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src)
774 if (src->ops->clone) {
776 err = src->ops->clone(dst, src);
780 memcpy(dst, src, src->ops->size);
783 __module_get(src->ops->type->owner);
788 * struct nft_rule - nf_tables rule
790 * @list: used internally
791 * @handle: rule handle
792 * @genmask: generation mask
793 * @dlen: length of expression data
794 * @udata: user data is appended to the rule
795 * @data: expression data
798 struct list_head list;
804 __attribute__((aligned(__alignof__(struct nft_expr))));
807 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
809 return (struct nft_expr *)&rule->data[0];
812 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
814 return ((void *)expr) + expr->ops->size;
817 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
819 return (struct nft_expr *)&rule->data[rule->dlen];
822 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
824 return (void *)&rule->data[rule->dlen];
828 * The last pointer isn't really necessary, but the compiler isn't able to
829 * determine that the result of nft_expr_last() is always the same since it
830 * can't assume that the dlen value wasn't changed within calls in the loop.
832 #define nft_rule_for_each_expr(expr, last, rule) \
833 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
835 (expr) = nft_expr_next(expr))
837 enum nft_chain_flags {
838 NFT_BASE_CHAIN = 0x1,
842 * struct nft_chain - nf_tables chain
844 * @rules: list of rules in the chain
845 * @list: used internally
846 * @table: table that this chain belongs to
847 * @handle: chain handle
848 * @use: number of jump references to this chain
849 * @level: length of longest path to this chain
850 * @flags: bitmask of enum nft_chain_flags
851 * @name: name of the chain
854 struct list_head rules;
855 struct list_head list;
856 struct nft_table *table;
862 char name[NFT_CHAIN_MAXNAMELEN];
865 enum nft_chain_type {
866 NFT_CHAIN_T_DEFAULT = 0,
873 * struct nf_chain_type - nf_tables chain type info
875 * @name: name of the type
876 * @type: numeric identifier
877 * @family: address family
878 * @owner: module owner
879 * @hook_mask: mask of valid hooks
880 * @hooks: hookfn overrides
882 struct nf_chain_type {
884 enum nft_chain_type type;
886 struct module *owner;
887 unsigned int hook_mask;
888 nf_hookfn *hooks[NF_MAX_HOOKS];
891 int nft_chain_validate_dependency(const struct nft_chain *chain,
892 enum nft_chain_type type);
893 int nft_chain_validate_hooks(const struct nft_chain *chain,
894 unsigned int hook_flags);
899 struct u64_stats_sync syncp;
902 #define NFT_HOOK_OPS_MAX 2
905 * struct nft_base_chain - nf_tables base chain
907 * @ops: netfilter hook ops
909 * @policy: default policy
910 * @stats: per-cpu chain stats
912 * @dev_name: device name that this base chain is attached to (if any)
914 struct nft_base_chain {
915 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
916 const struct nf_chain_type *type;
919 struct nft_stats __percpu *stats;
920 struct nft_chain chain;
921 char dev_name[IFNAMSIZ];
924 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
926 return container_of(chain, struct nft_base_chain, chain);
929 static inline bool nft_is_base_chain(const struct nft_chain *chain)
931 return chain->flags & NFT_BASE_CHAIN;
934 int __nft_release_basechain(struct nft_ctx *ctx);
936 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv);
939 * struct nft_table - nf_tables table
941 * @list: used internally
942 * @chains: chains in the table
943 * @sets: sets in the table
944 * @objects: stateful objects in the table
945 * @hgenerator: handle generator state
946 * @use: number of chain references to this table
947 * @flags: table flag (see enum nft_table_flags)
948 * @genmask: generation mask
949 * @name: name of the table
952 struct list_head list;
953 struct list_head chains;
954 struct list_head sets;
955 struct list_head objects;
960 char name[NFT_TABLE_MAXNAMELEN];
964 NFT_AF_NEEDS_DEV = (1 << 0),
968 * struct nft_af_info - nf_tables address family info
970 * @list: used internally
971 * @family: address family
972 * @nhooks: number of hooks in this family
973 * @owner: module owner
974 * @tables: used internally
975 * @flags: family flags
976 * @nops: number of hook ops in this family
977 * @hook_ops_init: initialization function for chain hook ops
978 * @hooks: hookfn overrides for packet validation
981 struct list_head list;
984 struct module *owner;
985 struct list_head tables;
988 void (*hook_ops_init)(struct nf_hook_ops *,
990 nf_hookfn *hooks[NF_MAX_HOOKS];
993 int nft_register_afinfo(struct net *, struct nft_af_info *);
994 void nft_unregister_afinfo(struct net *, struct nft_af_info *);
996 int nft_register_chain_type(const struct nf_chain_type *);
997 void nft_unregister_chain_type(const struct nf_chain_type *);
999 int nft_register_expr(struct nft_expr_type *);
1000 void nft_unregister_expr(struct nft_expr_type *);
1002 int nft_verdict_dump(struct sk_buff *skb, int type,
1003 const struct nft_verdict *v);
1006 * struct nft_object - nf_tables stateful object
1008 * @list: table stateful object list node
1009 * @table: table this object belongs to
1010 * @type: pointer to object type
1011 * @data: pointer to object data
1012 * @name: name of this stateful object
1013 * @genmask: generation mask
1014 * @use: number of references to this stateful object
1015 * @data: object data, layout depends on type
1018 struct list_head list;
1019 char name[NFT_OBJ_MAXNAMELEN];
1020 struct nft_table *table;
1023 /* runtime data below here */
1024 const struct nft_object_type *type ____cacheline_aligned;
1025 unsigned char data[]
1026 __attribute__((aligned(__alignof__(u64))));
1029 static inline void *nft_obj_data(const struct nft_object *obj)
1031 return (void *)obj->data;
1034 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr))
1036 struct nft_object *nf_tables_obj_lookup(const struct nft_table *table,
1037 const struct nlattr *nla, u32 objtype,
1040 void nft_obj_notify(struct net *net, struct nft_table *table,
1041 struct nft_object *obj, u32 portid, u32 seq,
1042 int event, int family, int report, gfp_t gfp);
1045 * struct nft_object_type - stateful object type
1047 * @eval: stateful object evaluation function
1048 * @list: list node in list of object types
1049 * @type: stateful object numeric type
1050 * @size: stateful object size
1051 * @owner: module owner
1052 * @maxattr: maximum netlink attribute
1053 * @policy: netlink attribute policy
1054 * @init: initialize object from netlink attributes
1055 * @destroy: release existing stateful object
1056 * @dump: netlink dump stateful object
1058 struct nft_object_type {
1059 void (*eval)(struct nft_object *obj,
1060 struct nft_regs *regs,
1061 const struct nft_pktinfo *pkt);
1062 struct list_head list;
1065 unsigned int maxattr;
1066 struct module *owner;
1067 const struct nla_policy *policy;
1068 int (*init)(const struct nft_ctx *ctx,
1069 const struct nlattr *const tb[],
1070 struct nft_object *obj);
1071 void (*destroy)(struct nft_object *obj);
1072 int (*dump)(struct sk_buff *skb,
1073 struct nft_object *obj,
1077 int nft_register_obj(struct nft_object_type *obj_type);
1078 void nft_unregister_obj(struct nft_object_type *obj_type);
1081 * struct nft_traceinfo - nft tracing information and state
1083 * @pkt: pktinfo currently processed
1084 * @basechain: base chain currently processed
1085 * @chain: chain currently processed
1086 * @rule: rule that was evaluated
1087 * @verdict: verdict given by rule
1088 * @type: event type (enum nft_trace_types)
1089 * @packet_dumped: packet headers sent in a previous traceinfo message
1090 * @trace: other struct members are initialised
1092 struct nft_traceinfo {
1093 const struct nft_pktinfo *pkt;
1094 const struct nft_base_chain *basechain;
1095 const struct nft_chain *chain;
1096 const struct nft_rule *rule;
1097 const struct nft_verdict *verdict;
1098 enum nft_trace_types type;
1103 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt,
1104 const struct nft_verdict *verdict,
1105 const struct nft_chain *basechain);
1107 void nft_trace_notify(struct nft_traceinfo *info);
1109 #define nft_dereference(p) \
1110 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
1112 #define MODULE_ALIAS_NFT_FAMILY(family) \
1113 MODULE_ALIAS("nft-afinfo-" __stringify(family))
1115 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
1116 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
1118 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
1119 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
1121 #define MODULE_ALIAS_NFT_EXPR(name) \
1122 MODULE_ALIAS("nft-expr-" name)
1124 #define MODULE_ALIAS_NFT_SET() \
1125 MODULE_ALIAS("nft-set")
1127 #define MODULE_ALIAS_NFT_OBJ(type) \
1128 MODULE_ALIAS("nft-obj-" __stringify(type))
1131 * The gencursor defines two generations, the currently active and the
1132 * next one. Objects contain a bitmask of 2 bits specifying the generations
1133 * they're active in. A set bit means they're inactive in the generation
1134 * represented by that bit.
1136 * New objects start out as inactive in the current and active in the
1137 * next generation. When committing the ruleset the bitmask is cleared,
1138 * meaning they're active in all generations. When removing an object,
1139 * it is set inactive in the next generation. After committing the ruleset,
1140 * the objects are removed.
1142 static inline unsigned int nft_gencursor_next(const struct net *net)
1144 return net->nft.gencursor + 1 == 1 ? 1 : 0;
1147 static inline u8 nft_genmask_next(const struct net *net)
1149 return 1 << nft_gencursor_next(net);
1152 static inline u8 nft_genmask_cur(const struct net *net)
1154 /* Use ACCESS_ONCE() to prevent refetching the value for atomicity */
1155 return 1 << ACCESS_ONCE(net->nft.gencursor);
1158 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1))
1161 * Generic transaction helpers
1164 /* Check if this object is currently active. */
1165 #define nft_is_active(__net, __obj) \
1166 (((__obj)->genmask & nft_genmask_cur(__net)) == 0)
1168 /* Check if this object is active in the next generation. */
1169 #define nft_is_active_next(__net, __obj) \
1170 (((__obj)->genmask & nft_genmask_next(__net)) == 0)
1172 /* This object becomes active in the next generation. */
1173 #define nft_activate_next(__net, __obj) \
1174 (__obj)->genmask = nft_genmask_cur(__net)
1176 /* This object becomes inactive in the next generation. */
1177 #define nft_deactivate_next(__net, __obj) \
1178 (__obj)->genmask = nft_genmask_next(__net)
1180 /* After committing the ruleset, clear the stale generation bit. */
1181 #define nft_clear(__net, __obj) \
1182 (__obj)->genmask &= ~nft_genmask_next(__net)
1183 #define nft_active_genmask(__obj, __genmask) \
1184 !((__obj)->genmask & __genmask)
1187 * Set element transaction helpers
1190 static inline bool nft_set_elem_active(const struct nft_set_ext *ext,
1193 return !(ext->genmask & genmask);
1196 static inline void nft_set_elem_change_active(const struct net *net,
1197 const struct nft_set *set,
1198 struct nft_set_ext *ext)
1200 ext->genmask ^= nft_genmask_next(net);
1204 * We use a free bit in the genmask field to indicate the element
1205 * is busy, meaning it is currently being processed either by
1206 * the netlink API or GC.
1208 * Even though the genmask is only a single byte wide, this works
1209 * because the extension structure if fully constant once initialized,
1210 * so there are no non-atomic write accesses unless it is already
1213 #define NFT_SET_ELEM_BUSY_MASK (1 << 2)
1215 #if defined(__LITTLE_ENDIAN_BITFIELD)
1216 #define NFT_SET_ELEM_BUSY_BIT 2
1217 #elif defined(__BIG_ENDIAN_BITFIELD)
1218 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2)
1223 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext)
1225 unsigned long *word = (unsigned long *)ext;
1227 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0);
1228 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word);
1231 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext)
1233 unsigned long *word = (unsigned long *)ext;
1235 clear_bit(NFT_SET_ELEM_BUSY_BIT, word);
1239 * struct nft_trans - nf_tables object update in transaction
1241 * @list: used internally
1242 * @msg_type: message type
1243 * @ctx: transaction context
1244 * @data: internal information related to the transaction
1247 struct list_head list;
1253 struct nft_trans_rule {
1254 struct nft_rule *rule;
1258 #define nft_trans_rule(trans) \
1259 (((struct nft_trans_rule *)trans->data)->rule)
1260 #define nft_trans_rule_id(trans) \
1261 (((struct nft_trans_rule *)trans->data)->rule_id)
1263 struct nft_trans_set {
1264 struct nft_set *set;
1268 #define nft_trans_set(trans) \
1269 (((struct nft_trans_set *)trans->data)->set)
1270 #define nft_trans_set_id(trans) \
1271 (((struct nft_trans_set *)trans->data)->set_id)
1273 struct nft_trans_chain {
1275 char name[NFT_CHAIN_MAXNAMELEN];
1276 struct nft_stats __percpu *stats;
1280 #define nft_trans_chain_update(trans) \
1281 (((struct nft_trans_chain *)trans->data)->update)
1282 #define nft_trans_chain_name(trans) \
1283 (((struct nft_trans_chain *)trans->data)->name)
1284 #define nft_trans_chain_stats(trans) \
1285 (((struct nft_trans_chain *)trans->data)->stats)
1286 #define nft_trans_chain_policy(trans) \
1287 (((struct nft_trans_chain *)trans->data)->policy)
1289 struct nft_trans_table {
1294 #define nft_trans_table_update(trans) \
1295 (((struct nft_trans_table *)trans->data)->update)
1296 #define nft_trans_table_enable(trans) \
1297 (((struct nft_trans_table *)trans->data)->enable)
1299 struct nft_trans_elem {
1300 struct nft_set *set;
1301 struct nft_set_elem elem;
1304 #define nft_trans_elem_set(trans) \
1305 (((struct nft_trans_elem *)trans->data)->set)
1306 #define nft_trans_elem(trans) \
1307 (((struct nft_trans_elem *)trans->data)->elem)
1309 struct nft_trans_obj {
1310 struct nft_object *obj;
1313 #define nft_trans_obj(trans) \
1314 (((struct nft_trans_obj *)trans->data)->obj)
1316 #endif /* _NET_NF_TABLES_H */