1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _NET_NF_TABLES_H 3#define _NET_NF_TABLES_H 4 5#include <asm/unaligned.h> 6#include <linux/list.h> 7#include <linux/netfilter.h> 8#include <linux/netfilter/nfnetlink.h> 9#include <linux/netfilter/x_tables.h> 10#include <linux/netfilter/nf_tables.h> 11#include <linux/u64_stats_sync.h> 12#include <linux/rhashtable.h> 13#include <net/netfilter/nf_flow_table.h> 14#include <net/netlink.h> 15#include <net/flow_offload.h> 16#include <net/netns/generic.h> 17 18#define NFT_MAX_HOOKS (NF_INET_INGRESS + 1) 19 20struct module; 21 22#define NFT_JUMP_STACK_SIZE 16 23 24enum { 25 NFT_PKTINFO_L4PROTO = (1 << 0), 26 NFT_PKTINFO_INNER = (1 << 1), 27 NFT_PKTINFO_INNER_FULL = (1 << 2), 28}; 29 30struct nft_pktinfo { 31 struct sk_buff *skb; 32 const struct nf_hook_state *state; 33 u8 flags; 34 u8 tprot; 35 u16 fragoff; 36 u16 thoff; 37 u16 inneroff; 38}; 39 40static inline struct sock *nft_sk(const struct nft_pktinfo *pkt) 41{ 42 return pkt->state->sk; 43} 44 45static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt) 46{ 47 return pkt->thoff; 48} 49 50static inline struct net *nft_net(const struct nft_pktinfo *pkt) 51{ 52 return pkt->state->net; 53} 54 55static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) 56{ 57 return pkt->state->hook; 58} 59 60static inline u8 nft_pf(const struct nft_pktinfo *pkt) 61{ 62 return pkt->state->pf; 63} 64 65static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) 66{ 67 return pkt->state->in; 68} 69 70static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) 71{ 72 return pkt->state->out; 73} 74 75static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, 76 struct sk_buff *skb, 77 const struct nf_hook_state *state) 78{ 79 pkt->skb = skb; 80 pkt->state = state; 81} 82 83static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt) 84{ 85 pkt->flags = 0; 86 pkt->tprot = 0; 87 pkt->thoff = 0; 88 pkt->fragoff = 0; 89} 90 91/** 92 * struct nft_verdict - nf_tables verdict 93 * 94 * @code: nf_tables/netfilter verdict code 95 * @chain: destination chain for NFT_JUMP/NFT_GOTO 96 */ 97struct nft_verdict { 98 u32 code; 99 struct nft_chain *chain; 100}; 101 102struct nft_data { 103 union { 104 u32 data[4]; 105 struct nft_verdict verdict; 106 }; 107} __attribute__((aligned(__alignof__(u64)))); 108 109#define NFT_REG32_NUM 20 110 111/** 112 * struct nft_regs - nf_tables register set 113 * 114 * @data: data registers 115 * @verdict: verdict register 116 * 117 * The first four data registers alias to the verdict register. 118 */ 119struct nft_regs { 120 union { 121 u32 data[NFT_REG32_NUM]; 122 struct nft_verdict verdict; 123 }; 124}; 125 126struct nft_regs_track { 127 struct { 128 const struct nft_expr *selector; 129 const struct nft_expr *bitwise; 130 u8 num_reg; 131 } regs[NFT_REG32_NUM]; 132 133 const struct nft_expr *cur; 134 const struct nft_expr *last; 135}; 136 137/* Store/load an u8, u16 or u64 integer to/from the u32 data register. 138 * 139 * Note, when using concatenations, register allocation happens at 32-bit 140 * level. So for store instruction, pad the rest part with zero to avoid 141 * garbage values. 142 */ 143 144static inline void nft_reg_store8(u32 *dreg, u8 val) 145{ 146 *dreg = 0; 147 *(u8 *)dreg = val; 148} 149 150static inline u8 nft_reg_load8(const u32 *sreg) 151{ 152 return *(u8 *)sreg; 153} 154 155static inline void nft_reg_store16(u32 *dreg, u16 val) 156{ 157 *dreg = 0; 158 *(u16 *)dreg = val; 159} 160 161static inline void nft_reg_store_be16(u32 *dreg, __be16 val) 162{ 163 nft_reg_store16(dreg, (__force __u16)val); 164} 165 166static inline u16 nft_reg_load16(const u32 *sreg) 167{ 168 return *(u16 *)sreg; 169} 170 171static inline __be16 nft_reg_load_be16(const u32 *sreg) 172{ 173 return (__force __be16)nft_reg_load16(sreg); 174} 175 176static inline __be32 nft_reg_load_be32(const u32 *sreg) 177{ 178 return *(__force __be32 *)sreg; 179} 180 181static inline void nft_reg_store64(u64 *dreg, u64 val) 182{ 183 put_unaligned(val, dreg); 184} 185 186static inline u64 nft_reg_load64(const u32 *sreg) 187{ 188 return get_unaligned((u64 *)sreg); 189} 190 191static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 192 unsigned int len) 193{ 194 if (len % NFT_REG32_SIZE) 195 dst[len / NFT_REG32_SIZE] = 0; 196 memcpy(dst, src, len); 197} 198 199/** 200 * struct nft_ctx - nf_tables rule/set context 201 * 202 * @net: net namespace 203 * @table: the table the chain is contained in 204 * @chain: the chain the rule is contained in 205 * @nla: netlink attributes 206 * @portid: netlink portID of the original message 207 * @seq: netlink sequence number 208 * @flags: modifiers to new request 209 * @family: protocol family 210 * @level: depth of the chains 211 * @report: notify via unicast netlink message 212 */ 213struct nft_ctx { 214 struct net *net; 215 struct nft_table *table; 216 struct nft_chain *chain; 217 const struct nlattr * const *nla; 218 u32 portid; 219 u32 seq; 220 u16 flags; 221 u8 family; 222 u8 level; 223 bool report; 224}; 225 226enum nft_data_desc_flags { 227 NFT_DATA_DESC_SETELEM = (1 << 0), 228}; 229 230struct nft_data_desc { 231 enum nft_data_types type; 232 unsigned int size; 233 unsigned int len; 234 unsigned int flags; 235}; 236 237int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, 238 struct nft_data_desc *desc, const struct nlattr *nla); 239void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 240void nft_data_release(const struct nft_data *data, enum nft_data_types type); 241int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 242 enum nft_data_types type, unsigned int len); 243 244static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 245{ 246 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 247} 248 249static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 250{ 251 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 252} 253 254int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 255int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 256 257int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len); 258int nft_parse_register_store(const struct nft_ctx *ctx, 259 const struct nlattr *attr, u8 *dreg, 260 const struct nft_data *data, 261 enum nft_data_types type, unsigned int len); 262 263/** 264 * struct nft_userdata - user defined data associated with an object 265 * 266 * @len: length of the data 267 * @data: content 268 * 269 * The presence of user data is indicated in an object specific fashion, 270 * so a length of zero can't occur and the value "len" indicates data 271 * of length len + 1. 272 */ 273struct nft_userdata { 274 u8 len; 275 unsigned char data[]; 276}; 277 278/* placeholder structure for opaque set element backend representation. */ 279struct nft_elem_priv { }; 280 281/** 282 * struct nft_set_elem - generic representation of set elements 283 * 284 * @key: element key 285 * @key_end: closing element key 286 * @data: element data 287 * @priv: element private data and extensions 288 */ 289struct nft_set_elem { 290 union { 291 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 292 struct nft_data val; 293 } key; 294 union { 295 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 296 struct nft_data val; 297 } key_end; 298 union { 299 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 300 struct nft_data val; 301 } data; 302 struct nft_elem_priv *priv; 303}; 304 305static inline void *nft_elem_priv_cast(const struct nft_elem_priv *priv) 306{ 307 return (void *)priv; 308} 309 310 311/** 312 * enum nft_iter_type - nftables set iterator type 313 * 314 * @NFT_ITER_READ: read-only iteration over set elements 315 * @NFT_ITER_UPDATE: iteration under mutex to update set element state 316 */ 317enum nft_iter_type { 318 NFT_ITER_UNSPEC, 319 NFT_ITER_READ, 320 NFT_ITER_UPDATE, 321}; 322 323struct nft_set; 324struct nft_set_iter { 325 u8 genmask; 326 enum nft_iter_type type:8; 327 unsigned int count; 328 unsigned int skip; 329 int err; 330 int (*fn)(const struct nft_ctx *ctx, 331 struct nft_set *set, 332 const struct nft_set_iter *iter, 333 struct nft_elem_priv *elem_priv); 334}; 335 336/** 337 * struct nft_set_desc - description of set elements 338 * 339 * @ktype: key type 340 * @klen: key length 341 * @dtype: data type 342 * @dlen: data length 343 * @objtype: object type 344 * @size: number of set elements 345 * @policy: set policy 346 * @gc_int: garbage collector interval 347 * @timeout: element timeout 348 * @field_len: length of each field in concatenation, bytes 349 * @field_count: number of concatenated fields in element 350 * @expr: set must support for expressions 351 */ 352struct nft_set_desc { 353 u32 ktype; 354 unsigned int klen; 355 u32 dtype; 356 unsigned int dlen; 357 u32 objtype; 358 unsigned int size; 359 u32 policy; 360 u32 gc_int; 361 u64 timeout; 362 u8 field_len[NFT_REG32_COUNT]; 363 u8 field_count; 364 bool expr; 365}; 366 367/** 368 * enum nft_set_class - performance class 369 * 370 * @NFT_SET_CLASS_O_1: constant, O(1) 371 * @NFT_SET_CLASS_O_LOG_N: logarithmic, O(log N) 372 * @NFT_SET_CLASS_O_N: linear, O(N) 373 */ 374enum nft_set_class { 375 NFT_SET_CLASS_O_1, 376 NFT_SET_CLASS_O_LOG_N, 377 NFT_SET_CLASS_O_N, 378}; 379 380/** 381 * struct nft_set_estimate - estimation of memory and performance 382 * characteristics 383 * 384 * @size: required memory 385 * @lookup: lookup performance class 386 * @space: memory class 387 */ 388struct nft_set_estimate { 389 u64 size; 390 enum nft_set_class lookup; 391 enum nft_set_class space; 392}; 393 394#define NFT_EXPR_MAXATTR 16 395#define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 396 ALIGN(size, __alignof__(struct nft_expr))) 397 398/** 399 * struct nft_expr - nf_tables expression 400 * 401 * @ops: expression ops 402 * @data: expression private data 403 */ 404struct nft_expr { 405 const struct nft_expr_ops *ops; 406 unsigned char data[] 407 __attribute__((aligned(__alignof__(u64)))); 408}; 409 410static inline void *nft_expr_priv(const struct nft_expr *expr) 411{ 412 return (void *)expr->data; 413} 414 415struct nft_expr_info; 416 417int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla, 418 struct nft_expr_info *info); 419int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); 420void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 421int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 422 const struct nft_expr *expr, bool reset); 423bool nft_expr_reduce_bitwise(struct nft_regs_track *track, 424 const struct nft_expr *expr); 425 426struct nft_set_ext; 427 428/** 429 * struct nft_set_ops - nf_tables set operations 430 * 431 * @lookup: look up an element within the set 432 * @update: update an element if exists, add it if doesn't exist 433 * @delete: delete an element 434 * @insert: insert new element into set 435 * @activate: activate new element in the next generation 436 * @deactivate: lookup for element and deactivate it in the next generation 437 * @flush: deactivate element in the next generation 438 * @remove: remove element from set 439 * @walk: iterate over all set elements 440 * @get: get set elements 441 * @commit: commit set elements 442 * @abort: abort set elements 443 * @privsize: function to return size of set private data 444 * @estimate: estimate the required memory size and the lookup complexity class 445 * @init: initialize private data of new set instance 446 * @destroy: destroy private data of set instance 447 * @gc_init: initialize garbage collection 448 * @elemsize: element private size 449 * 450 * Operations lookup, update and delete have simpler interfaces, are faster 451 * and currently only used in the packet path. All the rest are slower, 452 * control plane functions. 453 */ 454struct nft_set_ops { 455 bool (*lookup)(const struct net *net, 456 const struct nft_set *set, 457 const u32 *key, 458 const struct nft_set_ext **ext); 459 bool (*update)(struct nft_set *set, 460 const u32 *key, 461 struct nft_elem_priv * 462 (*new)(struct nft_set *, 463 const struct nft_expr *, 464 struct nft_regs *), 465 const struct nft_expr *expr, 466 struct nft_regs *regs, 467 const struct nft_set_ext **ext); 468 bool (*delete)(const struct nft_set *set, 469 const u32 *key); 470 471 int (*insert)(const struct net *net, 472 const struct nft_set *set, 473 const struct nft_set_elem *elem, 474 struct nft_elem_priv **priv); 475 void (*activate)(const struct net *net, 476 const struct nft_set *set, 477 struct nft_elem_priv *elem_priv); 478 struct nft_elem_priv * (*deactivate)(const struct net *net, 479 const struct nft_set *set, 480 const struct nft_set_elem *elem); 481 void (*flush)(const struct net *net, 482 const struct nft_set *set, 483 struct nft_elem_priv *priv); 484 void (*remove)(const struct net *net, 485 const struct nft_set *set, 486 struct nft_elem_priv *elem_priv); 487 void (*walk)(const struct nft_ctx *ctx, 488 struct nft_set *set, 489 struct nft_set_iter *iter); 490 struct nft_elem_priv * (*get)(const struct net *net, 491 const struct nft_set *set, 492 const struct nft_set_elem *elem, 493 unsigned int flags); 494 void (*commit)(struct nft_set *set); 495 void (*abort)(const struct nft_set *set); 496 u64 (*privsize)(const struct nlattr * const nla[], 497 const struct nft_set_desc *desc); 498 bool (*estimate)(const struct nft_set_desc *desc, 499 u32 features, 500 struct nft_set_estimate *est); 501 int (*init)(const struct nft_set *set, 502 const struct nft_set_desc *desc, 503 const struct nlattr * const nla[]); 504 void (*destroy)(const struct nft_ctx *ctx, 505 const struct nft_set *set); 506 void (*gc_init)(const struct nft_set *set); 507 508 unsigned int elemsize; 509}; 510 511/** 512 * struct nft_set_type - nf_tables set type 513 * 514 * @ops: set ops for this type 515 * @features: features supported by the implementation 516 */ 517struct nft_set_type { 518 const struct nft_set_ops ops; 519 u32 features; 520}; 521#define to_set_type(o) container_of(o, struct nft_set_type, ops) 522 523struct nft_set_elem_expr { 524 u8 size; 525 unsigned char data[] 526 __attribute__((aligned(__alignof__(struct nft_expr)))); 527}; 528 529#define nft_setelem_expr_at(__elem_expr, __offset) \ 530 ((struct nft_expr *)&__elem_expr->data[__offset]) 531 532#define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 533 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 534 __size < (__elem_expr)->size; \ 535 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 536 537#define NFT_SET_EXPR_MAX 2 538 539/** 540 * struct nft_set - nf_tables set instance 541 * 542 * @list: table set list node 543 * @bindings: list of set bindings 544 * @refs: internal refcounting for async set destruction 545 * @table: table this set belongs to 546 * @net: netnamespace this set belongs to 547 * @name: name of the set 548 * @handle: unique handle of the set 549 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 550 * @dtype: data type (verdict or numeric type defined by userspace) 551 * @objtype: object type (see NFT_OBJECT_* definitions) 552 * @size: maximum set size 553 * @field_len: length of each field in concatenation, bytes 554 * @field_count: number of concatenated fields in element 555 * @use: number of rules references to this set 556 * @nelems: number of elements 557 * @ndeact: number of deactivated elements queued for removal 558 * @timeout: default timeout value in jiffies 559 * @gc_int: garbage collection interval in msecs 560 * @policy: set parameterization (see enum nft_set_policies) 561 * @udlen: user data length 562 * @udata: user data 563 * @pending_update: list of pending update set element 564 * @ops: set ops 565 * @flags: set flags 566 * @dead: set will be freed, never cleared 567 * @genmask: generation mask 568 * @klen: key length 569 * @dlen: data length 570 * @num_exprs: numbers of exprs 571 * @exprs: stateful expression 572 * @catchall_list: list of catch-all set element 573 * @data: private set data 574 */ 575struct nft_set { 576 struct list_head list; 577 struct list_head bindings; 578 refcount_t refs; 579 struct nft_table *table; 580 possible_net_t net; 581 char *name; 582 u64 handle; 583 u32 ktype; 584 u32 dtype; 585 u32 objtype; 586 u32 size; 587 u8 field_len[NFT_REG32_COUNT]; 588 u8 field_count; 589 u32 use; 590 atomic_t nelems; 591 u32 ndeact; 592 u64 timeout; 593 u32 gc_int; 594 u16 policy; 595 u16 udlen; 596 unsigned char *udata; 597 struct list_head pending_update; 598 /* runtime data below here */ 599 const struct nft_set_ops *ops ____cacheline_aligned; 600 u16 flags:13, 601 dead:1, 602 genmask:2; 603 u8 klen; 604 u8 dlen; 605 u8 num_exprs; 606 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 607 struct list_head catchall_list; 608 unsigned char data[] 609 __attribute__((aligned(__alignof__(u64)))); 610}; 611 612static inline bool nft_set_is_anonymous(const struct nft_set *set) 613{ 614 return set->flags & NFT_SET_ANONYMOUS; 615} 616 617static inline void *nft_set_priv(const struct nft_set *set) 618{ 619 return (void *)set->data; 620} 621 622static inline bool nft_set_gc_is_pending(const struct nft_set *s) 623{ 624 return refcount_read(&s->refs) != 1; 625} 626 627static inline struct nft_set *nft_set_container_of(const void *priv) 628{ 629 return (void *)priv - offsetof(struct nft_set, data); 630} 631 632struct nft_set *nft_set_lookup_global(const struct net *net, 633 const struct nft_table *table, 634 const struct nlattr *nla_set_name, 635 const struct nlattr *nla_set_id, 636 u8 genmask); 637 638struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 639 const struct nft_set *set); 640 641static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 642{ 643 u32 gc_int = READ_ONCE(set->gc_int); 644 645 return gc_int ? msecs_to_jiffies(gc_int) : HZ; 646} 647 648/** 649 * struct nft_set_binding - nf_tables set binding 650 * 651 * @list: set bindings list node 652 * @chain: chain containing the rule bound to the set 653 * @flags: set action flags 654 * 655 * A set binding contains all information necessary for validation 656 * of new elements added to a bound set. 657 */ 658struct nft_set_binding { 659 struct list_head list; 660 const struct nft_chain *chain; 661 u32 flags; 662}; 663 664enum nft_trans_phase; 665void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set); 666void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 667 struct nft_set_binding *binding, 668 enum nft_trans_phase phase); 669int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 670 struct nft_set_binding *binding); 671void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 672 673/** 674 * enum nft_set_extensions - set extension type IDs 675 * 676 * @NFT_SET_EXT_KEY: element key 677 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 678 * @NFT_SET_EXT_DATA: mapping data 679 * @NFT_SET_EXT_FLAGS: element flags 680 * @NFT_SET_EXT_TIMEOUT: element timeout 681 * @NFT_SET_EXT_EXPIRATION: element expiration time 682 * @NFT_SET_EXT_USERDATA: user data associated with the element 683 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 684 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 685 * @NFT_SET_EXT_NUM: number of extension types 686 */ 687enum nft_set_extensions { 688 NFT_SET_EXT_KEY, 689 NFT_SET_EXT_KEY_END, 690 NFT_SET_EXT_DATA, 691 NFT_SET_EXT_FLAGS, 692 NFT_SET_EXT_TIMEOUT, 693 NFT_SET_EXT_EXPIRATION, 694 NFT_SET_EXT_USERDATA, 695 NFT_SET_EXT_EXPRESSIONS, 696 NFT_SET_EXT_OBJREF, 697 NFT_SET_EXT_NUM 698}; 699 700/** 701 * struct nft_set_ext_type - set extension type 702 * 703 * @len: fixed part length of the extension 704 * @align: alignment requirements of the extension 705 */ 706struct nft_set_ext_type { 707 u8 len; 708 u8 align; 709}; 710 711extern const struct nft_set_ext_type nft_set_ext_types[]; 712 713/** 714 * struct nft_set_ext_tmpl - set extension template 715 * 716 * @len: length of extension area 717 * @offset: offsets of individual extension types 718 * @ext_len: length of the expected extension(used to sanity check) 719 */ 720struct nft_set_ext_tmpl { 721 u16 len; 722 u8 offset[NFT_SET_EXT_NUM]; 723 u8 ext_len[NFT_SET_EXT_NUM]; 724}; 725 726/** 727 * struct nft_set_ext - set extensions 728 * 729 * @genmask: generation mask 730 * @offset: offsets of individual extension types 731 * @data: beginning of extension data 732 */ 733struct nft_set_ext { 734 u8 genmask; 735 u8 offset[NFT_SET_EXT_NUM]; 736 char data[]; 737}; 738 739static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 740{ 741 memset(tmpl, 0, sizeof(*tmpl)); 742 tmpl->len = sizeof(struct nft_set_ext); 743} 744 745static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 746 unsigned int len) 747{ 748 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 749 if (tmpl->len > U8_MAX) 750 return -EINVAL; 751 752 tmpl->offset[id] = tmpl->len; 753 tmpl->ext_len[id] = nft_set_ext_types[id].len + len; 754 tmpl->len += tmpl->ext_len[id]; 755 756 return 0; 757} 758 759static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 760{ 761 return nft_set_ext_add_length(tmpl, id, 0); 762} 763 764static inline void nft_set_ext_init(struct nft_set_ext *ext, 765 const struct nft_set_ext_tmpl *tmpl) 766{ 767 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 768} 769 770static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 771{ 772 return !!ext->offset[id]; 773} 774 775static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 776{ 777 return ext && __nft_set_ext_exists(ext, id); 778} 779 780static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 781{ 782 return (void *)ext + ext->offset[id]; 783} 784 785static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 786{ 787 return nft_set_ext(ext, NFT_SET_EXT_KEY); 788} 789 790static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 791{ 792 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 793} 794 795static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 796{ 797 return nft_set_ext(ext, NFT_SET_EXT_DATA); 798} 799 800static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 801{ 802 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 803} 804 805static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 806{ 807 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 808} 809 810static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 811{ 812 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 813} 814 815static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 816{ 817 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 818} 819 820static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 821{ 822 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 823} 824 825static inline bool __nft_set_elem_expired(const struct nft_set_ext *ext, 826 u64 tstamp) 827{ 828 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 829 time_after_eq64(tstamp, *nft_set_ext_expiration(ext)); 830} 831 832static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 833{ 834 return __nft_set_elem_expired(ext, get_jiffies_64()); 835} 836 837static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 838 const struct nft_elem_priv *elem_priv) 839{ 840 return (void *)elem_priv + set->ops->elemsize; 841} 842 843static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 844{ 845 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 846} 847 848struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 849 const struct nft_set *set, 850 const struct nlattr *attr); 851 852struct nft_elem_priv *nft_set_elem_init(const struct nft_set *set, 853 const struct nft_set_ext_tmpl *tmpl, 854 const u32 *key, const u32 *key_end, 855 const u32 *data, 856 u64 timeout, u64 expiration, gfp_t gfp); 857int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 858 struct nft_expr *expr_array[]); 859void nft_set_elem_destroy(const struct nft_set *set, 860 const struct nft_elem_priv *elem_priv, 861 bool destroy_expr); 862void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 863 const struct nft_set *set, 864 const struct nft_elem_priv *elem_priv); 865 866struct nft_expr_ops; 867/** 868 * struct nft_expr_type - nf_tables expression type 869 * 870 * @select_ops: function to select nft_expr_ops 871 * @release_ops: release nft_expr_ops 872 * @ops: default ops, used when no select_ops functions is present 873 * @inner_ops: inner ops, used for inner packet operation 874 * @list: used internally 875 * @name: Identifier 876 * @owner: module reference 877 * @policy: netlink attribute policy 878 * @maxattr: highest netlink attribute number 879 * @family: address family for AF-specific types 880 * @flags: expression type flags 881 */ 882struct nft_expr_type { 883 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 884 const struct nlattr * const tb[]); 885 void (*release_ops)(const struct nft_expr_ops *ops); 886 const struct nft_expr_ops *ops; 887 const struct nft_expr_ops *inner_ops; 888 struct list_head list; 889 const char *name; 890 struct module *owner; 891 const struct nla_policy *policy; 892 unsigned int maxattr; 893 u8 family; 894 u8 flags; 895}; 896 897#define NFT_EXPR_STATEFUL 0x1 898#define NFT_EXPR_GC 0x2 899 900enum nft_trans_phase { 901 NFT_TRANS_PREPARE, 902 NFT_TRANS_PREPARE_ERROR, 903 NFT_TRANS_ABORT, 904 NFT_TRANS_COMMIT, 905 NFT_TRANS_RELEASE 906}; 907 908struct nft_flow_rule; 909struct nft_offload_ctx; 910 911/** 912 * struct nft_expr_ops - nf_tables expression operations 913 * 914 * @eval: Expression evaluation function 915 * @clone: Expression clone function 916 * @size: full expression size, including private data size 917 * @init: initialization function 918 * @activate: activate expression in the next generation 919 * @deactivate: deactivate expression in next generation 920 * @destroy: destruction function, called after synchronize_rcu 921 * @destroy_clone: destruction clone function 922 * @dump: function to dump parameters 923 * @validate: validate expression, called during loop detection 924 * @reduce: reduce expression 925 * @gc: garbage collection expression 926 * @offload: hardware offload expression 927 * @offload_action: function to report true/false to allocate one slot or not in the flow 928 * offload array 929 * @offload_stats: function to synchronize hardware stats via updating the counter expression 930 * @type: expression type 931 * @data: extra data to attach to this expression operation 932 */ 933struct nft_expr_ops { 934 void (*eval)(const struct nft_expr *expr, 935 struct nft_regs *regs, 936 const struct nft_pktinfo *pkt); 937 int (*clone)(struct nft_expr *dst, 938 const struct nft_expr *src); 939 unsigned int size; 940 941 int (*init)(const struct nft_ctx *ctx, 942 const struct nft_expr *expr, 943 const struct nlattr * const tb[]); 944 void (*activate)(const struct nft_ctx *ctx, 945 const struct nft_expr *expr); 946 void (*deactivate)(const struct nft_ctx *ctx, 947 const struct nft_expr *expr, 948 enum nft_trans_phase phase); 949 void (*destroy)(const struct nft_ctx *ctx, 950 const struct nft_expr *expr); 951 void (*destroy_clone)(const struct nft_ctx *ctx, 952 const struct nft_expr *expr); 953 int (*dump)(struct sk_buff *skb, 954 const struct nft_expr *expr, 955 bool reset); 956 int (*validate)(const struct nft_ctx *ctx, 957 const struct nft_expr *expr, 958 const struct nft_data **data); 959 bool (*reduce)(struct nft_regs_track *track, 960 const struct nft_expr *expr); 961 bool (*gc)(struct net *net, 962 const struct nft_expr *expr); 963 int (*offload)(struct nft_offload_ctx *ctx, 964 struct nft_flow_rule *flow, 965 const struct nft_expr *expr); 966 bool (*offload_action)(const struct nft_expr *expr); 967 void (*offload_stats)(struct nft_expr *expr, 968 const struct flow_stats *stats); 969 const struct nft_expr_type *type; 970 void *data; 971}; 972 973/** 974 * struct nft_rule - nf_tables rule 975 * 976 * @list: used internally 977 * @handle: rule handle 978 * @genmask: generation mask 979 * @dlen: length of expression data 980 * @udata: user data is appended to the rule 981 * @data: expression data 982 */ 983struct nft_rule { 984 struct list_head list; 985 u64 handle:42, 986 genmask:2, 987 dlen:12, 988 udata:1; 989 unsigned char data[] 990 __attribute__((aligned(__alignof__(struct nft_expr)))); 991}; 992 993static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 994{ 995 return (struct nft_expr *)&rule->data[0]; 996} 997 998static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 999{ 1000 return ((void *)expr) + expr->ops->size; 1001} 1002 1003static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 1004{ 1005 return (struct nft_expr *)&rule->data[rule->dlen]; 1006} 1007 1008static inline bool nft_expr_more(const struct nft_rule *rule, 1009 const struct nft_expr *expr) 1010{ 1011 return expr != nft_expr_last(rule) && expr->ops; 1012} 1013 1014static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 1015{ 1016 return (void *)&rule->data[rule->dlen]; 1017} 1018 1019void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule); 1020void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule, 1021 enum nft_trans_phase phase); 1022void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule); 1023 1024static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 1025 struct nft_regs *regs, 1026 const struct nft_pktinfo *pkt) 1027{ 1028 struct nft_set_elem_expr *elem_expr; 1029 struct nft_expr *expr; 1030 u32 size; 1031 1032 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 1033 elem_expr = nft_set_ext_expr(ext); 1034 nft_setelem_expr_foreach(expr, elem_expr, size) { 1035 expr->ops->eval(expr, regs, pkt); 1036 if (regs->verdict.code == NFT_BREAK) 1037 return; 1038 } 1039 } 1040} 1041 1042/* 1043 * The last pointer isn't really necessary, but the compiler isn't able to 1044 * determine that the result of nft_expr_last() is always the same since it 1045 * can't assume that the dlen value wasn't changed within calls in the loop. 1046 */ 1047#define nft_rule_for_each_expr(expr, last, rule) \ 1048 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 1049 (expr) != (last); \ 1050 (expr) = nft_expr_next(expr)) 1051 1052#define NFT_CHAIN_POLICY_UNSET U8_MAX 1053 1054struct nft_rule_dp { 1055 u64 is_last:1, 1056 dlen:12, 1057 handle:42; /* for tracing */ 1058 unsigned char data[] 1059 __attribute__((aligned(__alignof__(struct nft_expr)))); 1060}; 1061 1062struct nft_rule_dp_last { 1063 struct nft_rule_dp end; /* end of nft_rule_blob marker */ 1064 struct rcu_head h; /* call_rcu head */ 1065 struct nft_rule_blob *blob; /* ptr to free via call_rcu */ 1066 const struct nft_chain *chain; /* for nftables tracing */ 1067}; 1068 1069static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule) 1070{ 1071 return (void *)rule + sizeof(*rule) + rule->dlen; 1072} 1073 1074struct nft_rule_blob { 1075 unsigned long size; 1076 unsigned char data[] 1077 __attribute__((aligned(__alignof__(struct nft_rule_dp)))); 1078}; 1079 1080/** 1081 * struct nft_chain - nf_tables chain 1082 * 1083 * @blob_gen_0: rule blob pointer to the current generation 1084 * @blob_gen_1: rule blob pointer to the future generation 1085 * @rules: list of rules in the chain 1086 * @list: used internally 1087 * @rhlhead: used internally 1088 * @table: table that this chain belongs to 1089 * @handle: chain handle 1090 * @use: number of jump references to this chain 1091 * @flags: bitmask of enum NFTA_CHAIN_FLAGS 1092 * @bound: bind or not 1093 * @genmask: generation mask 1094 * @name: name of the chain 1095 * @udlen: user data length 1096 * @udata: user data in the chain 1097 * @blob_next: rule blob pointer to the next in the chain 1098 */ 1099struct nft_chain { 1100 struct nft_rule_blob __rcu *blob_gen_0; 1101 struct nft_rule_blob __rcu *blob_gen_1; 1102 struct list_head rules; 1103 struct list_head list; 1104 struct rhlist_head rhlhead; 1105 struct nft_table *table; 1106 u64 handle; 1107 u32 use; 1108 u8 flags:5, 1109 bound:1, 1110 genmask:2; 1111 char *name; 1112 u16 udlen; 1113 u8 *udata; 1114 1115 /* Only used during control plane commit phase: */ 1116 struct nft_rule_blob *blob_next; 1117}; 1118 1119int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 1120int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set, 1121 const struct nft_set_iter *iter, 1122 struct nft_elem_priv *elem_priv); 1123int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set); 1124int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1125void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1126 1127enum nft_chain_types { 1128 NFT_CHAIN_T_DEFAULT = 0, 1129 NFT_CHAIN_T_ROUTE, 1130 NFT_CHAIN_T_NAT, 1131 NFT_CHAIN_T_MAX 1132}; 1133 1134/** 1135 * struct nft_chain_type - nf_tables chain type info 1136 * 1137 * @name: name of the type 1138 * @type: numeric identifier 1139 * @family: address family 1140 * @owner: module owner 1141 * @hook_mask: mask of valid hooks 1142 * @hooks: array of hook functions 1143 * @ops_register: base chain register function 1144 * @ops_unregister: base chain unregister function 1145 */ 1146struct nft_chain_type { 1147 const char *name; 1148 enum nft_chain_types type; 1149 int family; 1150 struct module *owner; 1151 unsigned int hook_mask; 1152 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1153 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1154 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1155}; 1156 1157int nft_chain_validate_dependency(const struct nft_chain *chain, 1158 enum nft_chain_types type); 1159int nft_chain_validate_hooks(const struct nft_chain *chain, 1160 unsigned int hook_flags); 1161 1162static inline bool nft_chain_binding(const struct nft_chain *chain) 1163{ 1164 return chain->flags & NFT_CHAIN_BINDING; 1165} 1166 1167static inline bool nft_chain_is_bound(struct nft_chain *chain) 1168{ 1169 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1170} 1171 1172int nft_chain_add(struct nft_table *table, struct nft_chain *chain); 1173void nft_chain_del(struct nft_chain *chain); 1174void nf_tables_chain_destroy(struct nft_ctx *ctx); 1175 1176struct nft_stats { 1177 u64 bytes; 1178 u64 pkts; 1179 struct u64_stats_sync syncp; 1180}; 1181 1182struct nft_hook { 1183 struct list_head list; 1184 struct nf_hook_ops ops; 1185 struct rcu_head rcu; 1186}; 1187 1188/** 1189 * struct nft_base_chain - nf_tables base chain 1190 * 1191 * @ops: netfilter hook ops 1192 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1193 * @type: chain type 1194 * @policy: default policy 1195 * @flags: indicate the base chain disabled or not 1196 * @stats: per-cpu chain stats 1197 * @chain: the chain 1198 * @flow_block: flow block (for hardware offload) 1199 */ 1200struct nft_base_chain { 1201 struct nf_hook_ops ops; 1202 struct list_head hook_list; 1203 const struct nft_chain_type *type; 1204 u8 policy; 1205 u8 flags; 1206 struct nft_stats __percpu *stats; 1207 struct nft_chain chain; 1208 struct flow_block flow_block; 1209}; 1210 1211static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1212{ 1213 return container_of(chain, struct nft_base_chain, chain); 1214} 1215 1216static inline bool nft_is_base_chain(const struct nft_chain *chain) 1217{ 1218 return chain->flags & NFT_CHAIN_BASE; 1219} 1220 1221int __nft_release_basechain(struct nft_ctx *ctx); 1222 1223unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1224 1225static inline bool nft_use_inc(u32 *use) 1226{ 1227 if (*use == UINT_MAX) 1228 return false; 1229 1230 (*use)++; 1231 1232 return true; 1233} 1234 1235static inline void nft_use_dec(u32 *use) 1236{ 1237 WARN_ON_ONCE((*use)-- == 0); 1238} 1239 1240/* For error and abort path: restore use counter to previous state. */ 1241static inline void nft_use_inc_restore(u32 *use) 1242{ 1243 WARN_ON_ONCE(!nft_use_inc(use)); 1244} 1245 1246#define nft_use_dec_restore nft_use_dec 1247 1248/** 1249 * struct nft_table - nf_tables table 1250 * 1251 * @list: used internally 1252 * @chains_ht: chains in the table 1253 * @chains: same, for stable walks 1254 * @sets: sets in the table 1255 * @objects: stateful objects in the table 1256 * @flowtables: flow tables in the table 1257 * @hgenerator: handle generator state 1258 * @handle: table handle 1259 * @use: number of chain references to this table 1260 * @family:address family 1261 * @flags: table flag (see enum nft_table_flags) 1262 * @genmask: generation mask 1263 * @nlpid: netlink port ID 1264 * @name: name of the table 1265 * @udlen: length of the user data 1266 * @udata: user data 1267 * @validate_state: internal, set when transaction adds jumps 1268 */ 1269struct nft_table { 1270 struct list_head list; 1271 struct rhltable chains_ht; 1272 struct list_head chains; 1273 struct list_head sets; 1274 struct list_head objects; 1275 struct list_head flowtables; 1276 u64 hgenerator; 1277 u64 handle; 1278 u32 use; 1279 u16 family:6, 1280 flags:8, 1281 genmask:2; 1282 u32 nlpid; 1283 char *name; 1284 u16 udlen; 1285 u8 *udata; 1286 u8 validate_state; 1287}; 1288 1289static inline bool nft_table_has_owner(const struct nft_table *table) 1290{ 1291 return table->flags & NFT_TABLE_F_OWNER; 1292} 1293 1294static inline bool nft_table_is_orphan(const struct nft_table *table) 1295{ 1296 return (table->flags & (NFT_TABLE_F_OWNER | NFT_TABLE_F_PERSIST)) == 1297 NFT_TABLE_F_PERSIST; 1298} 1299 1300static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1301{ 1302 return family == NFPROTO_NETDEV || 1303 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1304} 1305 1306void nft_register_chain_type(const struct nft_chain_type *); 1307void nft_unregister_chain_type(const struct nft_chain_type *); 1308 1309int nft_register_expr(struct nft_expr_type *); 1310void nft_unregister_expr(struct nft_expr_type *); 1311 1312int nft_verdict_dump(struct sk_buff *skb, int type, 1313 const struct nft_verdict *v); 1314 1315/** 1316 * struct nft_object_hash_key - key to lookup nft_object 1317 * 1318 * @name: name of the stateful object to look up 1319 * @table: table the object belongs to 1320 */ 1321struct nft_object_hash_key { 1322 const char *name; 1323 const struct nft_table *table; 1324}; 1325 1326/** 1327 * struct nft_object - nf_tables stateful object 1328 * 1329 * @list: table stateful object list node 1330 * @rhlhead: nft_objname_ht node 1331 * @key: keys that identify this object 1332 * @genmask: generation mask 1333 * @use: number of references to this stateful object 1334 * @handle: unique object handle 1335 * @udlen: length of user data 1336 * @udata: user data 1337 * @ops: object operations 1338 * @data: object data, layout depends on type 1339 */ 1340struct nft_object { 1341 struct list_head list; 1342 struct rhlist_head rhlhead; 1343 struct nft_object_hash_key key; 1344 u32 genmask:2; 1345 u32 use; 1346 u64 handle; 1347 u16 udlen; 1348 u8 *udata; 1349 /* runtime data below here */ 1350 const struct nft_object_ops *ops ____cacheline_aligned; 1351 unsigned char data[] 1352 __attribute__((aligned(__alignof__(u64)))); 1353}; 1354 1355static inline void *nft_obj_data(const struct nft_object *obj) 1356{ 1357 return (void *)obj->data; 1358} 1359 1360#define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1361 1362struct nft_object *nft_obj_lookup(const struct net *net, 1363 const struct nft_table *table, 1364 const struct nlattr *nla, u32 objtype, 1365 u8 genmask); 1366 1367void nft_obj_notify(struct net *net, const struct nft_table *table, 1368 struct nft_object *obj, u32 portid, u32 seq, 1369 int event, u16 flags, int family, int report, gfp_t gfp); 1370 1371/** 1372 * struct nft_object_type - stateful object type 1373 * 1374 * @select_ops: function to select nft_object_ops 1375 * @ops: default ops, used when no select_ops functions is present 1376 * @list: list node in list of object types 1377 * @type: stateful object numeric type 1378 * @owner: module owner 1379 * @maxattr: maximum netlink attribute 1380 * @family: address family for AF-specific object types 1381 * @policy: netlink attribute policy 1382 */ 1383struct nft_object_type { 1384 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1385 const struct nlattr * const tb[]); 1386 const struct nft_object_ops *ops; 1387 struct list_head list; 1388 u32 type; 1389 unsigned int maxattr; 1390 u8 family; 1391 struct module *owner; 1392 const struct nla_policy *policy; 1393}; 1394 1395/** 1396 * struct nft_object_ops - stateful object operations 1397 * 1398 * @eval: stateful object evaluation function 1399 * @size: stateful object size 1400 * @init: initialize object from netlink attributes 1401 * @destroy: release existing stateful object 1402 * @dump: netlink dump stateful object 1403 * @update: update stateful object 1404 * @type: pointer to object type 1405 */ 1406struct nft_object_ops { 1407 void (*eval)(struct nft_object *obj, 1408 struct nft_regs *regs, 1409 const struct nft_pktinfo *pkt); 1410 unsigned int size; 1411 int (*init)(const struct nft_ctx *ctx, 1412 const struct nlattr *const tb[], 1413 struct nft_object *obj); 1414 void (*destroy)(const struct nft_ctx *ctx, 1415 struct nft_object *obj); 1416 int (*dump)(struct sk_buff *skb, 1417 struct nft_object *obj, 1418 bool reset); 1419 void (*update)(struct nft_object *obj, 1420 struct nft_object *newobj); 1421 const struct nft_object_type *type; 1422}; 1423 1424int nft_register_obj(struct nft_object_type *obj_type); 1425void nft_unregister_obj(struct nft_object_type *obj_type); 1426 1427#define NFT_NETDEVICE_MAX 256 1428 1429/** 1430 * struct nft_flowtable - nf_tables flow table 1431 * 1432 * @list: flow table list node in table list 1433 * @table: the table the flow table is contained in 1434 * @name: name of this flow table 1435 * @hooknum: hook number 1436 * @ops_len: number of hooks in array 1437 * @genmask: generation mask 1438 * @use: number of references to this flow table 1439 * @handle: unique object handle 1440 * @hook_list: hook list for hooks per net_device in flowtables 1441 * @data: rhashtable and garbage collector 1442 */ 1443struct nft_flowtable { 1444 struct list_head list; 1445 struct nft_table *table; 1446 char *name; 1447 int hooknum; 1448 int ops_len; 1449 u32 genmask:2; 1450 u32 use; 1451 u64 handle; 1452 /* runtime data below here */ 1453 struct list_head hook_list ____cacheline_aligned; 1454 struct nf_flowtable data; 1455}; 1456 1457struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1458 const struct nlattr *nla, 1459 u8 genmask); 1460 1461void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1462 struct nft_flowtable *flowtable, 1463 enum nft_trans_phase phase); 1464 1465void nft_register_flowtable_type(struct nf_flowtable_type *type); 1466void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1467 1468/** 1469 * struct nft_traceinfo - nft tracing information and state 1470 * 1471 * @trace: other struct members are initialised 1472 * @nf_trace: copy of skb->nf_trace before rule evaluation 1473 * @type: event type (enum nft_trace_types) 1474 * @skbid: hash of skb to be used as trace id 1475 * @packet_dumped: packet headers sent in a previous traceinfo message 1476 * @basechain: base chain currently processed 1477 */ 1478struct nft_traceinfo { 1479 bool trace; 1480 bool nf_trace; 1481 bool packet_dumped; 1482 enum nft_trace_types type:8; 1483 u32 skbid; 1484 const struct nft_base_chain *basechain; 1485}; 1486 1487void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1488 const struct nft_chain *basechain); 1489 1490void nft_trace_notify(const struct nft_pktinfo *pkt, 1491 const struct nft_verdict *verdict, 1492 const struct nft_rule_dp *rule, 1493 struct nft_traceinfo *info); 1494 1495#define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1496 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1497 1498#define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1499 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1500 1501#define MODULE_ALIAS_NFT_EXPR(name) \ 1502 MODULE_ALIAS("nft-expr-" name) 1503 1504#define MODULE_ALIAS_NFT_OBJ(type) \ 1505 MODULE_ALIAS("nft-obj-" __stringify(type)) 1506 1507#if IS_ENABLED(CONFIG_NF_TABLES) 1508 1509/* 1510 * The gencursor defines two generations, the currently active and the 1511 * next one. Objects contain a bitmask of 2 bits specifying the generations 1512 * they're active in. A set bit means they're inactive in the generation 1513 * represented by that bit. 1514 * 1515 * New objects start out as inactive in the current and active in the 1516 * next generation. When committing the ruleset the bitmask is cleared, 1517 * meaning they're active in all generations. When removing an object, 1518 * it is set inactive in the next generation. After committing the ruleset, 1519 * the objects are removed. 1520 */ 1521static inline unsigned int nft_gencursor_next(const struct net *net) 1522{ 1523 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1524} 1525 1526static inline u8 nft_genmask_next(const struct net *net) 1527{ 1528 return 1 << nft_gencursor_next(net); 1529} 1530 1531static inline u8 nft_genmask_cur(const struct net *net) 1532{ 1533 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1534 return 1 << READ_ONCE(net->nft.gencursor); 1535} 1536 1537#define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1538 1539/* 1540 * Generic transaction helpers 1541 */ 1542 1543/* Check if this object is currently active. */ 1544#define nft_is_active(__net, __obj) \ 1545 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1546 1547/* Check if this object is active in the next generation. */ 1548#define nft_is_active_next(__net, __obj) \ 1549 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1550 1551/* This object becomes active in the next generation. */ 1552#define nft_activate_next(__net, __obj) \ 1553 (__obj)->genmask = nft_genmask_cur(__net) 1554 1555/* This object becomes inactive in the next generation. */ 1556#define nft_deactivate_next(__net, __obj) \ 1557 (__obj)->genmask = nft_genmask_next(__net) 1558 1559/* After committing the ruleset, clear the stale generation bit. */ 1560#define nft_clear(__net, __obj) \ 1561 (__obj)->genmask &= ~nft_genmask_next(__net) 1562#define nft_active_genmask(__obj, __genmask) \ 1563 !((__obj)->genmask & __genmask) 1564 1565/* 1566 * Set element transaction helpers 1567 */ 1568 1569static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1570 u8 genmask) 1571{ 1572 return !(ext->genmask & genmask); 1573} 1574 1575static inline void nft_set_elem_change_active(const struct net *net, 1576 const struct nft_set *set, 1577 struct nft_set_ext *ext) 1578{ 1579 ext->genmask ^= nft_genmask_next(net); 1580} 1581 1582#endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1583 1584#define NFT_SET_ELEM_DEAD_MASK (1 << 2) 1585 1586#if defined(__LITTLE_ENDIAN_BITFIELD) 1587#define NFT_SET_ELEM_DEAD_BIT 2 1588#elif defined(__BIG_ENDIAN_BITFIELD) 1589#define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1590#else 1591#error 1592#endif 1593 1594static inline void nft_set_elem_dead(struct nft_set_ext *ext) 1595{ 1596 unsigned long *word = (unsigned long *)ext; 1597 1598 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1599 set_bit(NFT_SET_ELEM_DEAD_BIT, word); 1600} 1601 1602static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext) 1603{ 1604 unsigned long *word = (unsigned long *)ext; 1605 1606 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1607 return test_bit(NFT_SET_ELEM_DEAD_BIT, word); 1608} 1609 1610/** 1611 * struct nft_trans - nf_tables object update in transaction 1612 * 1613 * @list: used internally 1614 * @binding_list: list of objects with possible bindings 1615 * @msg_type: message type 1616 * @put_net: ctx->net needs to be put 1617 * @ctx: transaction context 1618 * @data: internal information related to the transaction 1619 */ 1620struct nft_trans { 1621 struct list_head list; 1622 struct list_head binding_list; 1623 int msg_type; 1624 bool put_net; 1625 struct nft_ctx ctx; 1626 char data[]; 1627}; 1628 1629struct nft_trans_rule { 1630 struct nft_rule *rule; 1631 struct nft_flow_rule *flow; 1632 u32 rule_id; 1633 bool bound; 1634}; 1635 1636#define nft_trans_rule(trans) \ 1637 (((struct nft_trans_rule *)trans->data)->rule) 1638#define nft_trans_flow_rule(trans) \ 1639 (((struct nft_trans_rule *)trans->data)->flow) 1640#define nft_trans_rule_id(trans) \ 1641 (((struct nft_trans_rule *)trans->data)->rule_id) 1642#define nft_trans_rule_bound(trans) \ 1643 (((struct nft_trans_rule *)trans->data)->bound) 1644 1645struct nft_trans_set { 1646 struct nft_set *set; 1647 u32 set_id; 1648 u32 gc_int; 1649 u64 timeout; 1650 bool update; 1651 bool bound; 1652 u32 size; 1653}; 1654 1655#define nft_trans_set(trans) \ 1656 (((struct nft_trans_set *)trans->data)->set) 1657#define nft_trans_set_id(trans) \ 1658 (((struct nft_trans_set *)trans->data)->set_id) 1659#define nft_trans_set_bound(trans) \ 1660 (((struct nft_trans_set *)trans->data)->bound) 1661#define nft_trans_set_update(trans) \ 1662 (((struct nft_trans_set *)trans->data)->update) 1663#define nft_trans_set_timeout(trans) \ 1664 (((struct nft_trans_set *)trans->data)->timeout) 1665#define nft_trans_set_gc_int(trans) \ 1666 (((struct nft_trans_set *)trans->data)->gc_int) 1667#define nft_trans_set_size(trans) \ 1668 (((struct nft_trans_set *)trans->data)->size) 1669 1670struct nft_trans_chain { 1671 struct nft_chain *chain; 1672 bool update; 1673 char *name; 1674 struct nft_stats __percpu *stats; 1675 u8 policy; 1676 bool bound; 1677 u32 chain_id; 1678 struct nft_base_chain *basechain; 1679 struct list_head hook_list; 1680}; 1681 1682#define nft_trans_chain(trans) \ 1683 (((struct nft_trans_chain *)trans->data)->chain) 1684#define nft_trans_chain_update(trans) \ 1685 (((struct nft_trans_chain *)trans->data)->update) 1686#define nft_trans_chain_name(trans) \ 1687 (((struct nft_trans_chain *)trans->data)->name) 1688#define nft_trans_chain_stats(trans) \ 1689 (((struct nft_trans_chain *)trans->data)->stats) 1690#define nft_trans_chain_policy(trans) \ 1691 (((struct nft_trans_chain *)trans->data)->policy) 1692#define nft_trans_chain_bound(trans) \ 1693 (((struct nft_trans_chain *)trans->data)->bound) 1694#define nft_trans_chain_id(trans) \ 1695 (((struct nft_trans_chain *)trans->data)->chain_id) 1696#define nft_trans_basechain(trans) \ 1697 (((struct nft_trans_chain *)trans->data)->basechain) 1698#define nft_trans_chain_hooks(trans) \ 1699 (((struct nft_trans_chain *)trans->data)->hook_list) 1700 1701struct nft_trans_table { 1702 bool update; 1703}; 1704 1705#define nft_trans_table_update(trans) \ 1706 (((struct nft_trans_table *)trans->data)->update) 1707 1708struct nft_trans_elem { 1709 struct nft_set *set; 1710 struct nft_elem_priv *elem_priv; 1711 bool bound; 1712}; 1713 1714#define nft_trans_elem_set(trans) \ 1715 (((struct nft_trans_elem *)trans->data)->set) 1716#define nft_trans_elem_priv(trans) \ 1717 (((struct nft_trans_elem *)trans->data)->elem_priv) 1718#define nft_trans_elem_set_bound(trans) \ 1719 (((struct nft_trans_elem *)trans->data)->bound) 1720 1721struct nft_trans_obj { 1722 struct nft_object *obj; 1723 struct nft_object *newobj; 1724 bool update; 1725}; 1726 1727#define nft_trans_obj(trans) \ 1728 (((struct nft_trans_obj *)trans->data)->obj) 1729#define nft_trans_obj_newobj(trans) \ 1730 (((struct nft_trans_obj *)trans->data)->newobj) 1731#define nft_trans_obj_update(trans) \ 1732 (((struct nft_trans_obj *)trans->data)->update) 1733 1734struct nft_trans_flowtable { 1735 struct nft_flowtable *flowtable; 1736 bool update; 1737 struct list_head hook_list; 1738 u32 flags; 1739}; 1740 1741#define nft_trans_flowtable(trans) \ 1742 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1743#define nft_trans_flowtable_update(trans) \ 1744 (((struct nft_trans_flowtable *)trans->data)->update) 1745#define nft_trans_flowtable_hooks(trans) \ 1746 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1747#define nft_trans_flowtable_flags(trans) \ 1748 (((struct nft_trans_flowtable *)trans->data)->flags) 1749 1750#define NFT_TRANS_GC_BATCHCOUNT 256 1751 1752struct nft_trans_gc { 1753 struct list_head list; 1754 struct net *net; 1755 struct nft_set *set; 1756 u32 seq; 1757 u16 count; 1758 struct nft_elem_priv *priv[NFT_TRANS_GC_BATCHCOUNT]; 1759 struct rcu_head rcu; 1760}; 1761 1762struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set, 1763 unsigned int gc_seq, gfp_t gfp); 1764void nft_trans_gc_destroy(struct nft_trans_gc *trans); 1765 1766struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc, 1767 unsigned int gc_seq, gfp_t gfp); 1768void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc); 1769 1770struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp); 1771void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans); 1772 1773void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv); 1774 1775struct nft_trans_gc *nft_trans_gc_catchall_async(struct nft_trans_gc *gc, 1776 unsigned int gc_seq); 1777struct nft_trans_gc *nft_trans_gc_catchall_sync(struct nft_trans_gc *gc); 1778 1779void nft_setelem_data_deactivate(const struct net *net, 1780 const struct nft_set *set, 1781 struct nft_elem_priv *elem_priv); 1782 1783int __init nft_chain_filter_init(void); 1784void nft_chain_filter_fini(void); 1785 1786void __init nft_chain_route_init(void); 1787void nft_chain_route_fini(void); 1788 1789void nf_tables_trans_destroy_flush_work(void); 1790 1791int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1792__be64 nf_jiffies64_to_msecs(u64 input); 1793 1794#ifdef CONFIG_MODULES 1795__printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...); 1796#else 1797static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; } 1798#endif 1799 1800struct nftables_pernet { 1801 struct list_head tables; 1802 struct list_head commit_list; 1803 struct list_head binding_list; 1804 struct list_head module_list; 1805 struct list_head notify_list; 1806 struct mutex commit_mutex; 1807 u64 table_handle; 1808 u64 tstamp; 1809 unsigned int base_seq; 1810 unsigned int gc_seq; 1811 u8 validate_state; 1812}; 1813 1814extern unsigned int nf_tables_net_id; 1815 1816static inline struct nftables_pernet *nft_pernet(const struct net *net) 1817{ 1818 return net_generic(net, nf_tables_net_id); 1819} 1820 1821static inline u64 nft_net_tstamp(const struct net *net) 1822{ 1823 return nft_pernet(net)->tstamp; 1824} 1825 1826#define __NFT_REDUCE_READONLY 1UL 1827#define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY 1828 1829static inline bool nft_reduce_is_readonly(const struct nft_expr *expr) 1830{ 1831 return expr->ops->reduce == NFT_REDUCE_READONLY; 1832} 1833 1834void nft_reg_track_update(struct nft_regs_track *track, 1835 const struct nft_expr *expr, u8 dreg, u8 len); 1836void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len); 1837void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg); 1838 1839static inline bool nft_reg_track_cmp(struct nft_regs_track *track, 1840 const struct nft_expr *expr, u8 dreg) 1841{ 1842 return track->regs[dreg].selector && 1843 track->regs[dreg].selector->ops == expr->ops && 1844 track->regs[dreg].num_reg == 0; 1845} 1846 1847#endif /* _NET_NF_TABLES_H */ 1848