1 #ifndef _NET_NF_TABLES_H
2 #define _NET_NF_TABLES_H
4 #include <linux/list.h>
5 #include <linux/netfilter.h>
6 #include <linux/netfilter/nfnetlink.h>
7 #include <linux/netfilter/x_tables.h>
8 #include <linux/netfilter/nf_tables.h>
9 #include <net/netlink.h>
11 #define NFT_JUMP_STACK_SIZE 16
15 const struct net_device *in;
16 const struct net_device *out;
17 const struct nf_hook_ops *ops;
21 /* for x_tables compatibility */
22 struct xt_action_param xt;
25 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
26 const struct nf_hook_ops *ops,
28 const struct net_device *in,
29 const struct net_device *out)
32 pkt->in = pkt->xt.in = in;
33 pkt->out = pkt->xt.out = out;
35 pkt->xt.hooknum = ops->hooknum;
36 pkt->xt.family = ops->pf;
44 struct nft_chain *chain;
47 } __attribute__((aligned(__alignof__(u64))));
49 static inline int nft_data_cmp(const struct nft_data *d1,
50 const struct nft_data *d2,
53 return memcmp(d1->data, d2->data, len);
56 static inline void nft_data_copy(struct nft_data *dst,
57 const struct nft_data *src)
59 BUILD_BUG_ON(__alignof__(*dst) != __alignof__(u64));
60 *(u64 *)&dst->data[0] = *(u64 *)&src->data[0];
61 *(u64 *)&dst->data[2] = *(u64 *)&src->data[2];
64 static inline void nft_data_debug(const struct nft_data *data)
66 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n",
67 data->data[0], data->data[1],
68 data->data[2], data->data[3]);
72 * struct nft_ctx - nf_tables rule/set context
76 * @nlh: netlink message header
77 * @afi: address family info
78 * @table: the table the chain is contained in
79 * @chain: the chain the rule is contained in
80 * @nla: netlink attributes
84 const struct sk_buff *skb;
85 const struct nlmsghdr *nlh;
86 const struct nft_af_info *afi;
87 const struct nft_table *table;
88 const struct nft_chain *chain;
89 const struct nlattr * const *nla;
92 struct nft_data_desc {
93 enum nft_data_types type;
97 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,
98 struct nft_data_desc *desc, const struct nlattr *nla);
99 void nft_data_uninit(const struct nft_data *data, enum nft_data_types type);
100 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data,
101 enum nft_data_types type, unsigned int len);
103 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg)
105 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE;
108 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
110 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1;
113 int nft_validate_input_register(enum nft_registers reg);
114 int nft_validate_output_register(enum nft_registers reg);
115 int nft_validate_data_load(const struct nft_ctx *ctx, enum nft_registers reg,
116 const struct nft_data *data,
117 enum nft_data_types type);
120 * struct nft_set_elem - generic representation of set elements
122 * @cookie: implementation specific element cookie
124 * @data: element data (maps only)
125 * @flags: element flags (end of interval)
127 * The cookie can be used to store a handle to the element for subsequent
130 struct nft_set_elem {
133 struct nft_data data;
138 struct nft_set_iter {
142 int (*fn)(const struct nft_ctx *ctx,
143 const struct nft_set *set,
144 const struct nft_set_iter *iter,
145 const struct nft_set_elem *elem);
149 * struct nft_set_desc - description of set elements
153 * @size: number of set elements
155 struct nft_set_desc {
162 * enum nft_set_class - performance class
164 * @NFT_LOOKUP_O_1: constant, O(1)
165 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N)
166 * @NFT_LOOKUP_O_N: linear, O(N)
170 NFT_SET_CLASS_O_LOG_N,
175 * struct nft_set_estimate - estimation of memory and performance
178 * @size: required memory
179 * @class: lookup performance class
181 struct nft_set_estimate {
183 enum nft_set_class class;
187 * struct nft_set_ops - nf_tables set operations
189 * @lookup: look up an element within the set
190 * @insert: insert new element into set
191 * @remove: remove element from set
192 * @walk: iterate over all set elemeennts
193 * @privsize: function to return size of set private data
194 * @init: initialize private data of new set instance
195 * @destroy: destroy private data of set instance
196 * @list: nf_tables_set_ops list node
197 * @owner: module reference
198 * @features: features supported by the implementation
201 bool (*lookup)(const struct nft_set *set,
202 const struct nft_data *key,
203 struct nft_data *data);
204 int (*get)(const struct nft_set *set,
205 struct nft_set_elem *elem);
206 int (*insert)(const struct nft_set *set,
207 const struct nft_set_elem *elem);
208 void (*remove)(const struct nft_set *set,
209 const struct nft_set_elem *elem);
210 void (*walk)(const struct nft_ctx *ctx,
211 const struct nft_set *set,
212 struct nft_set_iter *iter);
214 unsigned int (*privsize)(const struct nlattr * const nla[]);
215 bool (*estimate)(const struct nft_set_desc *desc,
217 struct nft_set_estimate *est);
218 int (*init)(const struct nft_set *set,
219 const struct nft_set_desc *desc,
220 const struct nlattr * const nla[]);
221 void (*destroy)(const struct nft_set *set);
223 struct list_head list;
224 struct module *owner;
228 int nft_register_set(struct nft_set_ops *ops);
229 void nft_unregister_set(struct nft_set_ops *ops);
232 * struct nft_set - nf_tables set instance
234 * @list: table set list node
235 * @bindings: list of set bindings
236 * @name: name of the set
237 * @ktype: key type (numeric type defined by userspace, not used in the kernel)
238 * @dtype: data type (verdict or numeric type defined by userspace)
239 * @size: maximum set size
240 * @nelems: number of elements
245 * @data: private set data
248 struct list_head list;
249 struct list_head bindings;
255 /* runtime data below here */
256 const struct nft_set_ops *ops ____cacheline_aligned;
261 __attribute__((aligned(__alignof__(u64))));
264 static inline void *nft_set_priv(const struct nft_set *set)
266 return (void *)set->data;
269 struct nft_set *nf_tables_set_lookup(const struct nft_table *table,
270 const struct nlattr *nla);
273 * struct nft_set_binding - nf_tables set binding
275 * @list: set bindings list node
276 * @chain: chain containing the rule bound to the set
278 * A set binding contains all information necessary for validation
279 * of new elements added to a bound set.
281 struct nft_set_binding {
282 struct list_head list;
283 const struct nft_chain *chain;
286 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set,
287 struct nft_set_binding *binding);
288 void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
289 struct nft_set_binding *binding);
293 * struct nft_expr_type - nf_tables expression type
295 * @select_ops: function to select nft_expr_ops
296 * @ops: default ops, used when no select_ops functions is present
297 * @list: used internally
299 * @owner: module reference
300 * @policy: netlink attribute policy
301 * @maxattr: highest netlink attribute number
302 * @family: address family for AF-specific types
304 struct nft_expr_type {
305 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
306 const struct nlattr * const tb[]);
307 const struct nft_expr_ops *ops;
308 struct list_head list;
310 struct module *owner;
311 const struct nla_policy *policy;
312 unsigned int maxattr;
317 * struct nft_expr_ops - nf_tables expression operations
319 * @eval: Expression evaluation function
320 * @size: full expression size, including private data size
321 * @init: initialization function
322 * @destroy: destruction function
323 * @dump: function to dump parameters
324 * @type: expression type
325 * @validate: validate expression, called during loop detection
326 * @data: extra data to attach to this expression operation
329 struct nft_expr_ops {
330 void (*eval)(const struct nft_expr *expr,
331 struct nft_data data[NFT_REG_MAX + 1],
332 const struct nft_pktinfo *pkt);
335 int (*init)(const struct nft_ctx *ctx,
336 const struct nft_expr *expr,
337 const struct nlattr * const tb[]);
338 void (*destroy)(const struct nft_ctx *ctx,
339 const struct nft_expr *expr);
340 int (*dump)(struct sk_buff *skb,
341 const struct nft_expr *expr);
342 int (*validate)(const struct nft_ctx *ctx,
343 const struct nft_expr *expr,
344 const struct nft_data **data);
345 const struct nft_expr_type *type;
349 #define NFT_EXPR_MAXATTR 16
350 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \
351 ALIGN(size, __alignof__(struct nft_expr)))
354 * struct nft_expr - nf_tables expression
356 * @ops: expression ops
357 * @data: expression private data
360 const struct nft_expr_ops *ops;
361 unsigned char data[];
364 static inline void *nft_expr_priv(const struct nft_expr *expr)
366 return (void *)expr->data;
370 * struct nft_rule - nf_tables rule
372 * @list: used internally
373 * @handle: rule handle
374 * @genmask: generation mask
375 * @dlen: length of expression data
376 * @ulen: length of user data (used for comments)
377 * @data: expression data
380 struct list_head list;
386 __attribute__((aligned(__alignof__(struct nft_expr))));
390 * struct nft_rule_trans - nf_tables rule update in transaction
392 * @list: used internally
394 * @rule: rule that needs to be updated
396 struct nft_rule_trans {
397 struct list_head list;
399 struct nft_rule *rule;
402 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule)
404 return (struct nft_expr *)&rule->data[0];
407 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr)
409 return ((void *)expr) + expr->ops->size;
412 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
414 return (struct nft_expr *)&rule->data[rule->dlen];
417 static inline void *nft_userdata(const struct nft_rule *rule)
419 return (void *)&rule->data[rule->dlen];
423 * The last pointer isn't really necessary, but the compiler isn't able to
424 * determine that the result of nft_expr_last() is always the same since it
425 * can't assume that the dlen value wasn't changed within calls in the loop.
427 #define nft_rule_for_each_expr(expr, last, rule) \
428 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \
430 (expr) = nft_expr_next(expr))
432 enum nft_chain_flags {
433 NFT_BASE_CHAIN = 0x1,
437 * struct nft_chain - nf_tables chain
439 * @rules: list of rules in the chain
440 * @list: used internally
441 * @net: net namespace that this chain belongs to
442 * @table: table that this chain belongs to
443 * @handle: chain handle
444 * @flags: bitmask of enum nft_chain_flags
445 * @use: number of jump references to this chain
446 * @level: length of longest path to this chain
447 * @name: name of the chain
450 struct list_head rules;
451 struct list_head list;
453 struct nft_table *table;
458 char name[NFT_CHAIN_MAXNAMELEN];
461 enum nft_chain_type {
462 NFT_CHAIN_T_DEFAULT = 0,
473 #define NFT_HOOK_OPS_MAX 2
476 * struct nft_base_chain - nf_tables base chain
478 * @ops: netfilter hook ops
480 * @policy: default policy
481 * @stats: per-cpu chain stats
484 struct nft_base_chain {
485 struct nf_hook_ops ops[NFT_HOOK_OPS_MAX];
486 const struct nf_chain_type *type;
488 struct nft_stats __percpu *stats;
489 struct nft_chain chain;
492 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
494 return container_of(chain, struct nft_base_chain, chain);
497 unsigned int nft_do_chain(struct nft_pktinfo *pkt,
498 const struct nf_hook_ops *ops);
501 * struct nft_table - nf_tables table
503 * @list: used internally
504 * @chains: chains in the table
505 * @sets: sets in the table
506 * @hgenerator: handle generator state
507 * @use: number of chain references to this table
508 * @flags: table flag (see enum nft_table_flags)
509 * @name: name of the table
512 struct list_head list;
513 struct list_head chains;
514 struct list_head sets;
522 * struct nft_af_info - nf_tables address family info
524 * @list: used internally
525 * @family: address family
526 * @nhooks: number of hooks in this family
527 * @owner: module owner
528 * @tables: used internally
529 * @nops: number of hook ops in this family
530 * @hook_ops_init: initialization function for chain hook ops
531 * @hooks: hookfn overrides for packet validation
534 struct list_head list;
537 struct module *owner;
538 struct list_head tables;
540 void (*hook_ops_init)(struct nf_hook_ops *,
542 nf_hookfn *hooks[NF_MAX_HOOKS];
545 int nft_register_afinfo(struct net *, struct nft_af_info *);
546 void nft_unregister_afinfo(struct nft_af_info *);
549 * struct nf_chain_type - nf_tables chain type info
551 * @name: name of the type
552 * @type: numeric identifier
553 * @family: address family
554 * @owner: module owner
555 * @hook_mask: mask of valid hooks
556 * @hooks: hookfn overrides
558 struct nf_chain_type {
560 enum nft_chain_type type;
562 struct module *owner;
563 unsigned int hook_mask;
564 nf_hookfn *hooks[NF_MAX_HOOKS];
567 int nft_register_chain_type(const struct nf_chain_type *);
568 void nft_unregister_chain_type(const struct nf_chain_type *);
570 int nft_register_expr(struct nft_expr_type *);
571 void nft_unregister_expr(struct nft_expr_type *);
573 #define nft_dereference(p) \
574 nfnl_dereference(p, NFNL_SUBSYS_NFTABLES)
576 #define MODULE_ALIAS_NFT_FAMILY(family) \
577 MODULE_ALIAS("nft-afinfo-" __stringify(family))
579 #define MODULE_ALIAS_NFT_CHAIN(family, name) \
580 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name)
582 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \
583 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name)
585 #define MODULE_ALIAS_NFT_EXPR(name) \
586 MODULE_ALIAS("nft-expr-" name)
588 #define MODULE_ALIAS_NFT_SET() \
589 MODULE_ALIAS("nft-set")
591 #endif /* _NET_NF_TABLES_H */