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 20 struct module; 21 22 #define NFT_JUMP_STACK_SIZE 16 23 24 enum { 25 NFT_PKTINFO_L4PROTO = (1 << 0), 26 NFT_PKTINFO_INNER = (1 << 1), 27 }; 28 29 struct nft_pktinfo { 30 struct sk_buff *skb; 31 const struct nf_hook_state *state; 32 u8 flags; 33 u8 tprot; 34 u16 fragoff; 35 unsigned int thoff; 36 unsigned int inneroff; 37 }; 38 39 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt) 40 { 41 return pkt->state->sk; 42 } 43 44 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt) 45 { 46 return pkt->thoff; 47 } 48 49 static inline struct net *nft_net(const struct nft_pktinfo *pkt) 50 { 51 return pkt->state->net; 52 } 53 54 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) 55 { 56 return pkt->state->hook; 57 } 58 59 static inline u8 nft_pf(const struct nft_pktinfo *pkt) 60 { 61 return pkt->state->pf; 62 } 63 64 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) 65 { 66 return pkt->state->in; 67 } 68 69 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) 70 { 71 return pkt->state->out; 72 } 73 74 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, 75 struct sk_buff *skb, 76 const struct nf_hook_state *state) 77 { 78 pkt->skb = skb; 79 pkt->state = state; 80 } 81 82 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt) 83 { 84 pkt->flags = 0; 85 pkt->tprot = 0; 86 pkt->thoff = 0; 87 pkt->fragoff = 0; 88 } 89 90 /** 91 * struct nft_verdict - nf_tables verdict 92 * 93 * @code: nf_tables/netfilter verdict code 94 * @chain: destination chain for NFT_JUMP/NFT_GOTO 95 */ 96 struct nft_verdict { 97 u32 code; 98 struct nft_chain *chain; 99 }; 100 101 struct nft_data { 102 union { 103 u32 data[4]; 104 struct nft_verdict verdict; 105 }; 106 } __attribute__((aligned(__alignof__(u64)))); 107 108 #define NFT_REG32_NUM 20 109 110 /** 111 * struct nft_regs - nf_tables register set 112 * 113 * @data: data registers 114 * @verdict: verdict register 115 * 116 * The first four data registers alias to the verdict register. 117 */ 118 struct nft_regs { 119 union { 120 u32 data[NFT_REG32_NUM]; 121 struct nft_verdict verdict; 122 }; 123 }; 124 125 struct nft_regs_track { 126 struct { 127 const struct nft_expr *selector; 128 const struct nft_expr *bitwise; 129 u8 num_reg; 130 } regs[NFT_REG32_NUM]; 131 132 const struct nft_expr *cur; 133 const struct nft_expr *last; 134 }; 135 136 /* Store/load an u8, u16 or u64 integer to/from the u32 data register. 137 * 138 * Note, when using concatenations, register allocation happens at 32-bit 139 * level. So for store instruction, pad the rest part with zero to avoid 140 * garbage values. 141 */ 142 143 static inline void nft_reg_store8(u32 *dreg, u8 val) 144 { 145 *dreg = 0; 146 *(u8 *)dreg = val; 147 } 148 149 static inline u8 nft_reg_load8(const u32 *sreg) 150 { 151 return *(u8 *)sreg; 152 } 153 154 static inline void nft_reg_store16(u32 *dreg, u16 val) 155 { 156 *dreg = 0; 157 *(u16 *)dreg = val; 158 } 159 160 static inline u16 nft_reg_load16(const u32 *sreg) 161 { 162 return *(u16 *)sreg; 163 } 164 165 static inline void nft_reg_store64(u32 *dreg, u64 val) 166 { 167 put_unaligned(val, (u64 *)dreg); 168 } 169 170 static inline u64 nft_reg_load64(const u32 *sreg) 171 { 172 return get_unaligned((u64 *)sreg); 173 } 174 175 static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 176 unsigned int len) 177 { 178 if (len % NFT_REG32_SIZE) 179 dst[len / NFT_REG32_SIZE] = 0; 180 memcpy(dst, src, len); 181 } 182 183 /** 184 * struct nft_ctx - nf_tables rule/set context 185 * 186 * @net: net namespace 187 * @table: the table the chain is contained in 188 * @chain: the chain the rule is contained in 189 * @nla: netlink attributes 190 * @portid: netlink portID of the original message 191 * @seq: netlink sequence number 192 * @family: protocol family 193 * @level: depth of the chains 194 * @report: notify via unicast netlink message 195 */ 196 struct nft_ctx { 197 struct net *net; 198 struct nft_table *table; 199 struct nft_chain *chain; 200 const struct nlattr * const *nla; 201 u32 portid; 202 u32 seq; 203 u16 flags; 204 u8 family; 205 u8 level; 206 bool report; 207 }; 208 209 struct nft_data_desc { 210 enum nft_data_types type; 211 unsigned int len; 212 }; 213 214 int nft_data_init(const struct nft_ctx *ctx, 215 struct nft_data *data, unsigned int size, 216 struct nft_data_desc *desc, const struct nlattr *nla); 217 void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 218 void nft_data_release(const struct nft_data *data, enum nft_data_types type); 219 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 220 enum nft_data_types type, unsigned int len); 221 222 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 223 { 224 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 225 } 226 227 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 228 { 229 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 230 } 231 232 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 233 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 234 235 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len); 236 int nft_parse_register_store(const struct nft_ctx *ctx, 237 const struct nlattr *attr, u8 *dreg, 238 const struct nft_data *data, 239 enum nft_data_types type, unsigned int len); 240 241 /** 242 * struct nft_userdata - user defined data associated with an object 243 * 244 * @len: length of the data 245 * @data: content 246 * 247 * The presence of user data is indicated in an object specific fashion, 248 * so a length of zero can't occur and the value "len" indicates data 249 * of length len + 1. 250 */ 251 struct nft_userdata { 252 u8 len; 253 unsigned char data[]; 254 }; 255 256 /** 257 * struct nft_set_elem - generic representation of set elements 258 * 259 * @key: element key 260 * @key_end: closing element key 261 * @priv: element private data and extensions 262 */ 263 struct nft_set_elem { 264 union { 265 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 266 struct nft_data val; 267 } key; 268 union { 269 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 270 struct nft_data val; 271 } key_end; 272 union { 273 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 274 struct nft_data val; 275 } data; 276 void *priv; 277 }; 278 279 struct nft_set; 280 struct nft_set_iter { 281 u8 genmask; 282 unsigned int count; 283 unsigned int skip; 284 int err; 285 int (*fn)(const struct nft_ctx *ctx, 286 struct nft_set *set, 287 const struct nft_set_iter *iter, 288 struct nft_set_elem *elem); 289 }; 290 291 /** 292 * struct nft_set_desc - description of set elements 293 * 294 * @klen: key length 295 * @dlen: data length 296 * @size: number of set elements 297 * @field_len: length of each field in concatenation, bytes 298 * @field_count: number of concatenated fields in element 299 * @expr: set must support for expressions 300 */ 301 struct nft_set_desc { 302 unsigned int klen; 303 unsigned int dlen; 304 unsigned int size; 305 u8 field_len[NFT_REG32_COUNT]; 306 u8 field_count; 307 bool expr; 308 }; 309 310 /** 311 * enum nft_set_class - performance class 312 * 313 * @NFT_LOOKUP_O_1: constant, O(1) 314 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) 315 * @NFT_LOOKUP_O_N: linear, O(N) 316 */ 317 enum nft_set_class { 318 NFT_SET_CLASS_O_1, 319 NFT_SET_CLASS_O_LOG_N, 320 NFT_SET_CLASS_O_N, 321 }; 322 323 /** 324 * struct nft_set_estimate - estimation of memory and performance 325 * characteristics 326 * 327 * @size: required memory 328 * @lookup: lookup performance class 329 * @space: memory class 330 */ 331 struct nft_set_estimate { 332 u64 size; 333 enum nft_set_class lookup; 334 enum nft_set_class space; 335 }; 336 337 #define NFT_EXPR_MAXATTR 16 338 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 339 ALIGN(size, __alignof__(struct nft_expr))) 340 341 /** 342 * struct nft_expr - nf_tables expression 343 * 344 * @ops: expression ops 345 * @data: expression private data 346 */ 347 struct nft_expr { 348 const struct nft_expr_ops *ops; 349 unsigned char data[] 350 __attribute__((aligned(__alignof__(u64)))); 351 }; 352 353 static inline void *nft_expr_priv(const struct nft_expr *expr) 354 { 355 return (void *)expr->data; 356 } 357 358 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); 359 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 360 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 361 const struct nft_expr *expr); 362 bool nft_expr_reduce_bitwise(struct nft_regs_track *track, 363 const struct nft_expr *expr); 364 365 struct nft_set_ext; 366 367 /** 368 * struct nft_set_ops - nf_tables set operations 369 * 370 * @lookup: look up an element within the set 371 * @update: update an element if exists, add it if doesn't exist 372 * @delete: delete an element 373 * @insert: insert new element into set 374 * @activate: activate new element in the next generation 375 * @deactivate: lookup for element and deactivate it in the next generation 376 * @flush: deactivate element in the next generation 377 * @remove: remove element from set 378 * @walk: iterate over all set elements 379 * @get: get set elements 380 * @privsize: function to return size of set private data 381 * @init: initialize private data of new set instance 382 * @destroy: destroy private data of set instance 383 * @elemsize: element private size 384 * 385 * Operations lookup, update and delete have simpler interfaces, are faster 386 * and currently only used in the packet path. All the rest are slower, 387 * control plane functions. 388 */ 389 struct nft_set_ops { 390 bool (*lookup)(const struct net *net, 391 const struct nft_set *set, 392 const u32 *key, 393 const struct nft_set_ext **ext); 394 bool (*update)(struct nft_set *set, 395 const u32 *key, 396 void *(*new)(struct nft_set *, 397 const struct nft_expr *, 398 struct nft_regs *), 399 const struct nft_expr *expr, 400 struct nft_regs *regs, 401 const struct nft_set_ext **ext); 402 bool (*delete)(const struct nft_set *set, 403 const u32 *key); 404 405 int (*insert)(const struct net *net, 406 const struct nft_set *set, 407 const struct nft_set_elem *elem, 408 struct nft_set_ext **ext); 409 void (*activate)(const struct net *net, 410 const struct nft_set *set, 411 const struct nft_set_elem *elem); 412 void * (*deactivate)(const struct net *net, 413 const struct nft_set *set, 414 const struct nft_set_elem *elem); 415 bool (*flush)(const struct net *net, 416 const struct nft_set *set, 417 void *priv); 418 void (*remove)(const struct net *net, 419 const struct nft_set *set, 420 const struct nft_set_elem *elem); 421 void (*walk)(const struct nft_ctx *ctx, 422 struct nft_set *set, 423 struct nft_set_iter *iter); 424 void * (*get)(const struct net *net, 425 const struct nft_set *set, 426 const struct nft_set_elem *elem, 427 unsigned int flags); 428 429 u64 (*privsize)(const struct nlattr * const nla[], 430 const struct nft_set_desc *desc); 431 bool (*estimate)(const struct nft_set_desc *desc, 432 u32 features, 433 struct nft_set_estimate *est); 434 int (*init)(const struct nft_set *set, 435 const struct nft_set_desc *desc, 436 const struct nlattr * const nla[]); 437 void (*destroy)(const struct nft_set *set); 438 void (*gc_init)(const struct nft_set *set); 439 440 unsigned int elemsize; 441 }; 442 443 /** 444 * struct nft_set_type - nf_tables set type 445 * 446 * @ops: set ops for this type 447 * @features: features supported by the implementation 448 */ 449 struct nft_set_type { 450 const struct nft_set_ops ops; 451 u32 features; 452 }; 453 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 454 455 struct nft_set_elem_expr { 456 u8 size; 457 unsigned char data[] 458 __attribute__((aligned(__alignof__(struct nft_expr)))); 459 }; 460 461 #define nft_setelem_expr_at(__elem_expr, __offset) \ 462 ((struct nft_expr *)&__elem_expr->data[__offset]) 463 464 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 465 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 466 __size < (__elem_expr)->size; \ 467 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 468 469 #define NFT_SET_EXPR_MAX 2 470 471 /** 472 * struct nft_set - nf_tables set instance 473 * 474 * @list: table set list node 475 * @bindings: list of set bindings 476 * @table: table this set belongs to 477 * @net: netnamespace this set belongs to 478 * @name: name of the set 479 * @handle: unique handle of the set 480 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 481 * @dtype: data type (verdict or numeric type defined by userspace) 482 * @objtype: object type (see NFT_OBJECT_* definitions) 483 * @size: maximum set size 484 * @field_len: length of each field in concatenation, bytes 485 * @field_count: number of concatenated fields in element 486 * @use: number of rules references to this set 487 * @nelems: number of elements 488 * @ndeact: number of deactivated elements queued for removal 489 * @timeout: default timeout value in jiffies 490 * @gc_int: garbage collection interval in msecs 491 * @policy: set parameterization (see enum nft_set_policies) 492 * @udlen: user data length 493 * @udata: user data 494 * @expr: stateful expression 495 * @ops: set ops 496 * @flags: set flags 497 * @genmask: generation mask 498 * @klen: key length 499 * @dlen: data length 500 * @data: private set data 501 */ 502 struct nft_set { 503 struct list_head list; 504 struct list_head bindings; 505 struct nft_table *table; 506 possible_net_t net; 507 char *name; 508 u64 handle; 509 u32 ktype; 510 u32 dtype; 511 u32 objtype; 512 u32 size; 513 u8 field_len[NFT_REG32_COUNT]; 514 u8 field_count; 515 u32 use; 516 atomic_t nelems; 517 u32 ndeact; 518 u64 timeout; 519 u32 gc_int; 520 u16 policy; 521 u16 udlen; 522 unsigned char *udata; 523 /* runtime data below here */ 524 const struct nft_set_ops *ops ____cacheline_aligned; 525 u16 flags:14, 526 genmask:2; 527 u8 klen; 528 u8 dlen; 529 u8 num_exprs; 530 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 531 struct list_head catchall_list; 532 unsigned char data[] 533 __attribute__((aligned(__alignof__(u64)))); 534 }; 535 536 static inline bool nft_set_is_anonymous(const struct nft_set *set) 537 { 538 return set->flags & NFT_SET_ANONYMOUS; 539 } 540 541 static inline void *nft_set_priv(const struct nft_set *set) 542 { 543 return (void *)set->data; 544 } 545 546 static inline struct nft_set *nft_set_container_of(const void *priv) 547 { 548 return (void *)priv - offsetof(struct nft_set, data); 549 } 550 551 struct nft_set *nft_set_lookup_global(const struct net *net, 552 const struct nft_table *table, 553 const struct nlattr *nla_set_name, 554 const struct nlattr *nla_set_id, 555 u8 genmask); 556 557 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 558 const struct nft_set *set); 559 void *nft_set_catchall_gc(const struct nft_set *set); 560 561 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 562 { 563 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; 564 } 565 566 /** 567 * struct nft_set_binding - nf_tables set binding 568 * 569 * @list: set bindings list node 570 * @chain: chain containing the rule bound to the set 571 * @flags: set action flags 572 * 573 * A set binding contains all information necessary for validation 574 * of new elements added to a bound set. 575 */ 576 struct nft_set_binding { 577 struct list_head list; 578 const struct nft_chain *chain; 579 u32 flags; 580 }; 581 582 enum nft_trans_phase; 583 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 584 struct nft_set_binding *binding, 585 enum nft_trans_phase phase); 586 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 587 struct nft_set_binding *binding); 588 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 589 590 /** 591 * enum nft_set_extensions - set extension type IDs 592 * 593 * @NFT_SET_EXT_KEY: element key 594 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 595 * @NFT_SET_EXT_DATA: mapping data 596 * @NFT_SET_EXT_FLAGS: element flags 597 * @NFT_SET_EXT_TIMEOUT: element timeout 598 * @NFT_SET_EXT_EXPIRATION: element expiration time 599 * @NFT_SET_EXT_USERDATA: user data associated with the element 600 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 601 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 602 * @NFT_SET_EXT_NUM: number of extension types 603 */ 604 enum nft_set_extensions { 605 NFT_SET_EXT_KEY, 606 NFT_SET_EXT_KEY_END, 607 NFT_SET_EXT_DATA, 608 NFT_SET_EXT_FLAGS, 609 NFT_SET_EXT_TIMEOUT, 610 NFT_SET_EXT_EXPIRATION, 611 NFT_SET_EXT_USERDATA, 612 NFT_SET_EXT_EXPRESSIONS, 613 NFT_SET_EXT_OBJREF, 614 NFT_SET_EXT_NUM 615 }; 616 617 /** 618 * struct nft_set_ext_type - set extension type 619 * 620 * @len: fixed part length of the extension 621 * @align: alignment requirements of the extension 622 */ 623 struct nft_set_ext_type { 624 u8 len; 625 u8 align; 626 }; 627 628 extern const struct nft_set_ext_type nft_set_ext_types[]; 629 630 /** 631 * struct nft_set_ext_tmpl - set extension template 632 * 633 * @len: length of extension area 634 * @offset: offsets of individual extension types 635 */ 636 struct nft_set_ext_tmpl { 637 u16 len; 638 u8 offset[NFT_SET_EXT_NUM]; 639 }; 640 641 /** 642 * struct nft_set_ext - set extensions 643 * 644 * @genmask: generation mask 645 * @offset: offsets of individual extension types 646 * @data: beginning of extension data 647 */ 648 struct nft_set_ext { 649 u8 genmask; 650 u8 offset[NFT_SET_EXT_NUM]; 651 char data[]; 652 }; 653 654 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 655 { 656 memset(tmpl, 0, sizeof(*tmpl)); 657 tmpl->len = sizeof(struct nft_set_ext); 658 } 659 660 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 661 unsigned int len) 662 { 663 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 664 BUG_ON(tmpl->len > U8_MAX); 665 tmpl->offset[id] = tmpl->len; 666 tmpl->len += nft_set_ext_types[id].len + len; 667 } 668 669 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 670 { 671 nft_set_ext_add_length(tmpl, id, 0); 672 } 673 674 static inline void nft_set_ext_init(struct nft_set_ext *ext, 675 const struct nft_set_ext_tmpl *tmpl) 676 { 677 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 678 } 679 680 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 681 { 682 return !!ext->offset[id]; 683 } 684 685 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 686 { 687 return ext && __nft_set_ext_exists(ext, id); 688 } 689 690 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 691 { 692 return (void *)ext + ext->offset[id]; 693 } 694 695 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 696 { 697 return nft_set_ext(ext, NFT_SET_EXT_KEY); 698 } 699 700 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 701 { 702 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 703 } 704 705 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 706 { 707 return nft_set_ext(ext, NFT_SET_EXT_DATA); 708 } 709 710 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 711 { 712 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 713 } 714 715 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 716 { 717 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 718 } 719 720 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 721 { 722 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 723 } 724 725 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 726 { 727 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 728 } 729 730 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 731 { 732 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 733 } 734 735 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 736 { 737 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 738 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 739 } 740 741 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 742 void *elem) 743 { 744 return elem + set->ops->elemsize; 745 } 746 747 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 748 { 749 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 750 } 751 752 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 753 const struct nft_set *set, 754 const struct nlattr *attr); 755 756 void *nft_set_elem_init(const struct nft_set *set, 757 const struct nft_set_ext_tmpl *tmpl, 758 const u32 *key, const u32 *key_end, const u32 *data, 759 u64 timeout, u64 expiration, gfp_t gfp); 760 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 761 struct nft_expr *expr_array[]); 762 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 763 bool destroy_expr); 764 765 /** 766 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch 767 * 768 * @rcu: rcu head 769 * @set: set the elements belong to 770 * @cnt: count of elements 771 */ 772 struct nft_set_gc_batch_head { 773 struct rcu_head rcu; 774 const struct nft_set *set; 775 unsigned int cnt; 776 }; 777 778 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ 779 sizeof(struct nft_set_gc_batch_head)) / \ 780 sizeof(void *)) 781 782 /** 783 * struct nft_set_gc_batch - nf_tables set garbage collection batch 784 * 785 * @head: GC batch head 786 * @elems: garbage collection elements 787 */ 788 struct nft_set_gc_batch { 789 struct nft_set_gc_batch_head head; 790 void *elems[NFT_SET_GC_BATCH_SIZE]; 791 }; 792 793 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 794 gfp_t gfp); 795 void nft_set_gc_batch_release(struct rcu_head *rcu); 796 797 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) 798 { 799 if (gcb != NULL) 800 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); 801 } 802 803 static inline struct nft_set_gc_batch * 804 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, 805 gfp_t gfp) 806 { 807 if (gcb != NULL) { 808 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) 809 return gcb; 810 nft_set_gc_batch_complete(gcb); 811 } 812 return nft_set_gc_batch_alloc(set, gfp); 813 } 814 815 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, 816 void *elem) 817 { 818 gcb->elems[gcb->head.cnt++] = elem; 819 } 820 821 struct nft_expr_ops; 822 /** 823 * struct nft_expr_type - nf_tables expression type 824 * 825 * @select_ops: function to select nft_expr_ops 826 * @release_ops: release nft_expr_ops 827 * @ops: default ops, used when no select_ops functions is present 828 * @list: used internally 829 * @name: Identifier 830 * @owner: module reference 831 * @policy: netlink attribute policy 832 * @maxattr: highest netlink attribute number 833 * @family: address family for AF-specific types 834 * @flags: expression type flags 835 */ 836 struct nft_expr_type { 837 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 838 const struct nlattr * const tb[]); 839 void (*release_ops)(const struct nft_expr_ops *ops); 840 const struct nft_expr_ops *ops; 841 struct list_head list; 842 const char *name; 843 struct module *owner; 844 const struct nla_policy *policy; 845 unsigned int maxattr; 846 u8 family; 847 u8 flags; 848 }; 849 850 #define NFT_EXPR_STATEFUL 0x1 851 #define NFT_EXPR_GC 0x2 852 853 enum nft_trans_phase { 854 NFT_TRANS_PREPARE, 855 NFT_TRANS_ABORT, 856 NFT_TRANS_COMMIT, 857 NFT_TRANS_RELEASE 858 }; 859 860 struct nft_flow_rule; 861 struct nft_offload_ctx; 862 863 /** 864 * struct nft_expr_ops - nf_tables expression operations 865 * 866 * @eval: Expression evaluation function 867 * @size: full expression size, including private data size 868 * @init: initialization function 869 * @activate: activate expression in the next generation 870 * @deactivate: deactivate expression in next generation 871 * @destroy: destruction function, called after synchronize_rcu 872 * @dump: function to dump parameters 873 * @type: expression type 874 * @validate: validate expression, called during loop detection 875 * @data: extra data to attach to this expression operation 876 */ 877 struct nft_expr_ops { 878 void (*eval)(const struct nft_expr *expr, 879 struct nft_regs *regs, 880 const struct nft_pktinfo *pkt); 881 int (*clone)(struct nft_expr *dst, 882 const struct nft_expr *src); 883 unsigned int size; 884 885 int (*init)(const struct nft_ctx *ctx, 886 const struct nft_expr *expr, 887 const struct nlattr * const tb[]); 888 void (*activate)(const struct nft_ctx *ctx, 889 const struct nft_expr *expr); 890 void (*deactivate)(const struct nft_ctx *ctx, 891 const struct nft_expr *expr, 892 enum nft_trans_phase phase); 893 void (*destroy)(const struct nft_ctx *ctx, 894 const struct nft_expr *expr); 895 void (*destroy_clone)(const struct nft_ctx *ctx, 896 const struct nft_expr *expr); 897 int (*dump)(struct sk_buff *skb, 898 const struct nft_expr *expr); 899 int (*validate)(const struct nft_ctx *ctx, 900 const struct nft_expr *expr, 901 const struct nft_data **data); 902 bool (*reduce)(struct nft_regs_track *track, 903 const struct nft_expr *expr); 904 bool (*gc)(struct net *net, 905 const struct nft_expr *expr); 906 int (*offload)(struct nft_offload_ctx *ctx, 907 struct nft_flow_rule *flow, 908 const struct nft_expr *expr); 909 bool (*offload_action)(const struct nft_expr *expr); 910 void (*offload_stats)(struct nft_expr *expr, 911 const struct flow_stats *stats); 912 const struct nft_expr_type *type; 913 void *data; 914 }; 915 916 /** 917 * struct nft_rule - nf_tables rule 918 * 919 * @list: used internally 920 * @handle: rule handle 921 * @genmask: generation mask 922 * @dlen: length of expression data 923 * @udata: user data is appended to the rule 924 * @data: expression data 925 */ 926 struct nft_rule { 927 struct list_head list; 928 u64 handle:42, 929 genmask:2, 930 dlen:12, 931 udata:1; 932 unsigned char data[] 933 __attribute__((aligned(__alignof__(struct nft_expr)))); 934 }; 935 936 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 937 { 938 return (struct nft_expr *)&rule->data[0]; 939 } 940 941 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 942 { 943 return ((void *)expr) + expr->ops->size; 944 } 945 946 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 947 { 948 return (struct nft_expr *)&rule->data[rule->dlen]; 949 } 950 951 static inline bool nft_expr_more(const struct nft_rule *rule, 952 const struct nft_expr *expr) 953 { 954 return expr != nft_expr_last(rule) && expr->ops; 955 } 956 957 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 958 { 959 return (void *)&rule->data[rule->dlen]; 960 } 961 962 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule); 963 964 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 965 struct nft_regs *regs, 966 const struct nft_pktinfo *pkt) 967 { 968 struct nft_set_elem_expr *elem_expr; 969 struct nft_expr *expr; 970 u32 size; 971 972 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 973 elem_expr = nft_set_ext_expr(ext); 974 nft_setelem_expr_foreach(expr, elem_expr, size) { 975 expr->ops->eval(expr, regs, pkt); 976 if (regs->verdict.code == NFT_BREAK) 977 return; 978 } 979 } 980 } 981 982 /* 983 * The last pointer isn't really necessary, but the compiler isn't able to 984 * determine that the result of nft_expr_last() is always the same since it 985 * can't assume that the dlen value wasn't changed within calls in the loop. 986 */ 987 #define nft_rule_for_each_expr(expr, last, rule) \ 988 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 989 (expr) != (last); \ 990 (expr) = nft_expr_next(expr)) 991 992 #define NFT_CHAIN_POLICY_UNSET U8_MAX 993 994 struct nft_rule_dp { 995 u64 is_last:1, 996 dlen:12, 997 handle:42; /* for tracing */ 998 unsigned char data[] 999 __attribute__((aligned(__alignof__(struct nft_expr)))); 1000 }; 1001 1002 struct nft_rule_blob { 1003 unsigned long size; 1004 unsigned char data[] 1005 __attribute__((aligned(__alignof__(struct nft_rule_dp)))); 1006 }; 1007 1008 /** 1009 * struct nft_chain - nf_tables chain 1010 * 1011 * @rules: list of rules in the chain 1012 * @list: used internally 1013 * @rhlhead: used internally 1014 * @table: table that this chain belongs to 1015 * @handle: chain handle 1016 * @use: number of jump references to this chain 1017 * @flags: bitmask of enum nft_chain_flags 1018 * @name: name of the chain 1019 */ 1020 struct nft_chain { 1021 struct nft_rule_blob __rcu *blob_gen_0; 1022 struct nft_rule_blob __rcu *blob_gen_1; 1023 struct list_head rules; 1024 struct list_head list; 1025 struct rhlist_head rhlhead; 1026 struct nft_table *table; 1027 u64 handle; 1028 u32 use; 1029 u8 flags:5, 1030 bound:1, 1031 genmask:2; 1032 char *name; 1033 u16 udlen; 1034 u8 *udata; 1035 1036 /* Only used during control plane commit phase: */ 1037 struct nft_rule_blob *blob_next; 1038 }; 1039 1040 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 1041 1042 enum nft_chain_types { 1043 NFT_CHAIN_T_DEFAULT = 0, 1044 NFT_CHAIN_T_ROUTE, 1045 NFT_CHAIN_T_NAT, 1046 NFT_CHAIN_T_MAX 1047 }; 1048 1049 /** 1050 * struct nft_chain_type - nf_tables chain type info 1051 * 1052 * @name: name of the type 1053 * @type: numeric identifier 1054 * @family: address family 1055 * @owner: module owner 1056 * @hook_mask: mask of valid hooks 1057 * @hooks: array of hook functions 1058 * @ops_register: base chain register function 1059 * @ops_unregister: base chain unregister function 1060 */ 1061 struct nft_chain_type { 1062 const char *name; 1063 enum nft_chain_types type; 1064 int family; 1065 struct module *owner; 1066 unsigned int hook_mask; 1067 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1068 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1069 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1070 }; 1071 1072 int nft_chain_validate_dependency(const struct nft_chain *chain, 1073 enum nft_chain_types type); 1074 int nft_chain_validate_hooks(const struct nft_chain *chain, 1075 unsigned int hook_flags); 1076 1077 static inline bool nft_chain_is_bound(struct nft_chain *chain) 1078 { 1079 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1080 } 1081 1082 void nft_chain_del(struct nft_chain *chain); 1083 void nf_tables_chain_destroy(struct nft_ctx *ctx); 1084 1085 struct nft_stats { 1086 u64 bytes; 1087 u64 pkts; 1088 struct u64_stats_sync syncp; 1089 }; 1090 1091 struct nft_hook { 1092 struct list_head list; 1093 bool inactive; 1094 struct nf_hook_ops ops; 1095 struct rcu_head rcu; 1096 }; 1097 1098 /** 1099 * struct nft_base_chain - nf_tables base chain 1100 * 1101 * @ops: netfilter hook ops 1102 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1103 * @type: chain type 1104 * @policy: default policy 1105 * @stats: per-cpu chain stats 1106 * @chain: the chain 1107 * @flow_block: flow block (for hardware offload) 1108 */ 1109 struct nft_base_chain { 1110 struct nf_hook_ops ops; 1111 struct list_head hook_list; 1112 const struct nft_chain_type *type; 1113 u8 policy; 1114 u8 flags; 1115 struct nft_stats __percpu *stats; 1116 struct nft_chain chain; 1117 struct flow_block flow_block; 1118 }; 1119 1120 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1121 { 1122 return container_of(chain, struct nft_base_chain, chain); 1123 } 1124 1125 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1126 { 1127 return chain->flags & NFT_CHAIN_BASE; 1128 } 1129 1130 int __nft_release_basechain(struct nft_ctx *ctx); 1131 1132 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1133 1134 /** 1135 * struct nft_table - nf_tables table 1136 * 1137 * @list: used internally 1138 * @chains_ht: chains in the table 1139 * @chains: same, for stable walks 1140 * @sets: sets in the table 1141 * @objects: stateful objects in the table 1142 * @flowtables: flow tables in the table 1143 * @hgenerator: handle generator state 1144 * @handle: table handle 1145 * @use: number of chain references to this table 1146 * @flags: table flag (see enum nft_table_flags) 1147 * @genmask: generation mask 1148 * @afinfo: address family info 1149 * @name: name of the table 1150 */ 1151 struct nft_table { 1152 struct list_head list; 1153 struct rhltable chains_ht; 1154 struct list_head chains; 1155 struct list_head sets; 1156 struct list_head objects; 1157 struct list_head flowtables; 1158 u64 hgenerator; 1159 u64 handle; 1160 u32 use; 1161 u16 family:6, 1162 flags:8, 1163 genmask:2; 1164 u32 nlpid; 1165 char *name; 1166 u16 udlen; 1167 u8 *udata; 1168 }; 1169 1170 static inline bool nft_table_has_owner(const struct nft_table *table) 1171 { 1172 return table->flags & NFT_TABLE_F_OWNER; 1173 } 1174 1175 static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1176 { 1177 return family == NFPROTO_NETDEV || 1178 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1179 } 1180 1181 void nft_register_chain_type(const struct nft_chain_type *); 1182 void nft_unregister_chain_type(const struct nft_chain_type *); 1183 1184 int nft_register_expr(struct nft_expr_type *); 1185 void nft_unregister_expr(struct nft_expr_type *); 1186 1187 int nft_verdict_dump(struct sk_buff *skb, int type, 1188 const struct nft_verdict *v); 1189 1190 /** 1191 * struct nft_object_hash_key - key to lookup nft_object 1192 * 1193 * @name: name of the stateful object to look up 1194 * @table: table the object belongs to 1195 */ 1196 struct nft_object_hash_key { 1197 const char *name; 1198 const struct nft_table *table; 1199 }; 1200 1201 /** 1202 * struct nft_object - nf_tables stateful object 1203 * 1204 * @list: table stateful object list node 1205 * @key: keys that identify this object 1206 * @rhlhead: nft_objname_ht node 1207 * @genmask: generation mask 1208 * @use: number of references to this stateful object 1209 * @handle: unique object handle 1210 * @ops: object operations 1211 * @data: object data, layout depends on type 1212 */ 1213 struct nft_object { 1214 struct list_head list; 1215 struct rhlist_head rhlhead; 1216 struct nft_object_hash_key key; 1217 u32 genmask:2, 1218 use:30; 1219 u64 handle; 1220 u16 udlen; 1221 u8 *udata; 1222 /* runtime data below here */ 1223 const struct nft_object_ops *ops ____cacheline_aligned; 1224 unsigned char data[] 1225 __attribute__((aligned(__alignof__(u64)))); 1226 }; 1227 1228 static inline void *nft_obj_data(const struct nft_object *obj) 1229 { 1230 return (void *)obj->data; 1231 } 1232 1233 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1234 1235 struct nft_object *nft_obj_lookup(const struct net *net, 1236 const struct nft_table *table, 1237 const struct nlattr *nla, u32 objtype, 1238 u8 genmask); 1239 1240 void nft_obj_notify(struct net *net, const struct nft_table *table, 1241 struct nft_object *obj, u32 portid, u32 seq, 1242 int event, u16 flags, int family, int report, gfp_t gfp); 1243 1244 /** 1245 * struct nft_object_type - stateful object type 1246 * 1247 * @select_ops: function to select nft_object_ops 1248 * @ops: default ops, used when no select_ops functions is present 1249 * @list: list node in list of object types 1250 * @type: stateful object numeric type 1251 * @owner: module owner 1252 * @maxattr: maximum netlink attribute 1253 * @policy: netlink attribute policy 1254 */ 1255 struct nft_object_type { 1256 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1257 const struct nlattr * const tb[]); 1258 const struct nft_object_ops *ops; 1259 struct list_head list; 1260 u32 type; 1261 unsigned int maxattr; 1262 struct module *owner; 1263 const struct nla_policy *policy; 1264 }; 1265 1266 /** 1267 * struct nft_object_ops - stateful object operations 1268 * 1269 * @eval: stateful object evaluation function 1270 * @size: stateful object size 1271 * @init: initialize object from netlink attributes 1272 * @destroy: release existing stateful object 1273 * @dump: netlink dump stateful object 1274 * @update: update stateful object 1275 */ 1276 struct nft_object_ops { 1277 void (*eval)(struct nft_object *obj, 1278 struct nft_regs *regs, 1279 const struct nft_pktinfo *pkt); 1280 unsigned int size; 1281 int (*init)(const struct nft_ctx *ctx, 1282 const struct nlattr *const tb[], 1283 struct nft_object *obj); 1284 void (*destroy)(const struct nft_ctx *ctx, 1285 struct nft_object *obj); 1286 int (*dump)(struct sk_buff *skb, 1287 struct nft_object *obj, 1288 bool reset); 1289 void (*update)(struct nft_object *obj, 1290 struct nft_object *newobj); 1291 const struct nft_object_type *type; 1292 }; 1293 1294 int nft_register_obj(struct nft_object_type *obj_type); 1295 void nft_unregister_obj(struct nft_object_type *obj_type); 1296 1297 #define NFT_NETDEVICE_MAX 256 1298 1299 /** 1300 * struct nft_flowtable - nf_tables flow table 1301 * 1302 * @list: flow table list node in table list 1303 * @table: the table the flow table is contained in 1304 * @name: name of this flow table 1305 * @hooknum: hook number 1306 * @ops_len: number of hooks in array 1307 * @genmask: generation mask 1308 * @use: number of references to this flow table 1309 * @handle: unique object handle 1310 * @dev_name: array of device names 1311 * @data: rhashtable and garbage collector 1312 * @ops: array of hooks 1313 */ 1314 struct nft_flowtable { 1315 struct list_head list; 1316 struct nft_table *table; 1317 char *name; 1318 int hooknum; 1319 int ops_len; 1320 u32 genmask:2, 1321 use:30; 1322 u64 handle; 1323 /* runtime data below here */ 1324 struct list_head hook_list ____cacheline_aligned; 1325 struct nf_flowtable data; 1326 }; 1327 1328 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1329 const struct nlattr *nla, 1330 u8 genmask); 1331 1332 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1333 struct nft_flowtable *flowtable, 1334 enum nft_trans_phase phase); 1335 1336 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1337 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1338 1339 /** 1340 * struct nft_traceinfo - nft tracing information and state 1341 * 1342 * @pkt: pktinfo currently processed 1343 * @basechain: base chain currently processed 1344 * @chain: chain currently processed 1345 * @rule: rule that was evaluated 1346 * @verdict: verdict given by rule 1347 * @type: event type (enum nft_trace_types) 1348 * @packet_dumped: packet headers sent in a previous traceinfo message 1349 * @trace: other struct members are initialised 1350 */ 1351 struct nft_traceinfo { 1352 const struct nft_pktinfo *pkt; 1353 const struct nft_base_chain *basechain; 1354 const struct nft_chain *chain; 1355 const struct nft_rule_dp *rule; 1356 const struct nft_verdict *verdict; 1357 enum nft_trace_types type; 1358 bool packet_dumped; 1359 bool trace; 1360 }; 1361 1362 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1363 const struct nft_verdict *verdict, 1364 const struct nft_chain *basechain); 1365 1366 void nft_trace_notify(struct nft_traceinfo *info); 1367 1368 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1369 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1370 1371 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1372 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1373 1374 #define MODULE_ALIAS_NFT_EXPR(name) \ 1375 MODULE_ALIAS("nft-expr-" name) 1376 1377 #define MODULE_ALIAS_NFT_OBJ(type) \ 1378 MODULE_ALIAS("nft-obj-" __stringify(type)) 1379 1380 #if IS_ENABLED(CONFIG_NF_TABLES) 1381 1382 /* 1383 * The gencursor defines two generations, the currently active and the 1384 * next one. Objects contain a bitmask of 2 bits specifying the generations 1385 * they're active in. A set bit means they're inactive in the generation 1386 * represented by that bit. 1387 * 1388 * New objects start out as inactive in the current and active in the 1389 * next generation. When committing the ruleset the bitmask is cleared, 1390 * meaning they're active in all generations. When removing an object, 1391 * it is set inactive in the next generation. After committing the ruleset, 1392 * the objects are removed. 1393 */ 1394 static inline unsigned int nft_gencursor_next(const struct net *net) 1395 { 1396 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1397 } 1398 1399 static inline u8 nft_genmask_next(const struct net *net) 1400 { 1401 return 1 << nft_gencursor_next(net); 1402 } 1403 1404 static inline u8 nft_genmask_cur(const struct net *net) 1405 { 1406 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1407 return 1 << READ_ONCE(net->nft.gencursor); 1408 } 1409 1410 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1411 1412 /* 1413 * Generic transaction helpers 1414 */ 1415 1416 /* Check if this object is currently active. */ 1417 #define nft_is_active(__net, __obj) \ 1418 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1419 1420 /* Check if this object is active in the next generation. */ 1421 #define nft_is_active_next(__net, __obj) \ 1422 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1423 1424 /* This object becomes active in the next generation. */ 1425 #define nft_activate_next(__net, __obj) \ 1426 (__obj)->genmask = nft_genmask_cur(__net) 1427 1428 /* This object becomes inactive in the next generation. */ 1429 #define nft_deactivate_next(__net, __obj) \ 1430 (__obj)->genmask = nft_genmask_next(__net) 1431 1432 /* After committing the ruleset, clear the stale generation bit. */ 1433 #define nft_clear(__net, __obj) \ 1434 (__obj)->genmask &= ~nft_genmask_next(__net) 1435 #define nft_active_genmask(__obj, __genmask) \ 1436 !((__obj)->genmask & __genmask) 1437 1438 /* 1439 * Set element transaction helpers 1440 */ 1441 1442 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1443 u8 genmask) 1444 { 1445 return !(ext->genmask & genmask); 1446 } 1447 1448 static inline void nft_set_elem_change_active(const struct net *net, 1449 const struct nft_set *set, 1450 struct nft_set_ext *ext) 1451 { 1452 ext->genmask ^= nft_genmask_next(net); 1453 } 1454 1455 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1456 1457 /* 1458 * We use a free bit in the genmask field to indicate the element 1459 * is busy, meaning it is currently being processed either by 1460 * the netlink API or GC. 1461 * 1462 * Even though the genmask is only a single byte wide, this works 1463 * because the extension structure if fully constant once initialized, 1464 * so there are no non-atomic write accesses unless it is already 1465 * marked busy. 1466 */ 1467 #define NFT_SET_ELEM_BUSY_MASK (1 << 2) 1468 1469 #if defined(__LITTLE_ENDIAN_BITFIELD) 1470 #define NFT_SET_ELEM_BUSY_BIT 2 1471 #elif defined(__BIG_ENDIAN_BITFIELD) 1472 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1473 #else 1474 #error 1475 #endif 1476 1477 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) 1478 { 1479 unsigned long *word = (unsigned long *)ext; 1480 1481 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1482 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); 1483 } 1484 1485 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) 1486 { 1487 unsigned long *word = (unsigned long *)ext; 1488 1489 clear_bit(NFT_SET_ELEM_BUSY_BIT, word); 1490 } 1491 1492 /** 1493 * struct nft_trans - nf_tables object update in transaction 1494 * 1495 * @list: used internally 1496 * @msg_type: message type 1497 * @put_net: ctx->net needs to be put 1498 * @ctx: transaction context 1499 * @data: internal information related to the transaction 1500 */ 1501 struct nft_trans { 1502 struct list_head list; 1503 int msg_type; 1504 bool put_net; 1505 struct nft_ctx ctx; 1506 char data[]; 1507 }; 1508 1509 struct nft_trans_rule { 1510 struct nft_rule *rule; 1511 struct nft_flow_rule *flow; 1512 u32 rule_id; 1513 }; 1514 1515 #define nft_trans_rule(trans) \ 1516 (((struct nft_trans_rule *)trans->data)->rule) 1517 #define nft_trans_flow_rule(trans) \ 1518 (((struct nft_trans_rule *)trans->data)->flow) 1519 #define nft_trans_rule_id(trans) \ 1520 (((struct nft_trans_rule *)trans->data)->rule_id) 1521 1522 struct nft_trans_set { 1523 struct nft_set *set; 1524 u32 set_id; 1525 bool bound; 1526 }; 1527 1528 #define nft_trans_set(trans) \ 1529 (((struct nft_trans_set *)trans->data)->set) 1530 #define nft_trans_set_id(trans) \ 1531 (((struct nft_trans_set *)trans->data)->set_id) 1532 #define nft_trans_set_bound(trans) \ 1533 (((struct nft_trans_set *)trans->data)->bound) 1534 1535 struct nft_trans_chain { 1536 bool update; 1537 char *name; 1538 struct nft_stats __percpu *stats; 1539 u8 policy; 1540 u32 chain_id; 1541 }; 1542 1543 #define nft_trans_chain_update(trans) \ 1544 (((struct nft_trans_chain *)trans->data)->update) 1545 #define nft_trans_chain_name(trans) \ 1546 (((struct nft_trans_chain *)trans->data)->name) 1547 #define nft_trans_chain_stats(trans) \ 1548 (((struct nft_trans_chain *)trans->data)->stats) 1549 #define nft_trans_chain_policy(trans) \ 1550 (((struct nft_trans_chain *)trans->data)->policy) 1551 #define nft_trans_chain_id(trans) \ 1552 (((struct nft_trans_chain *)trans->data)->chain_id) 1553 1554 struct nft_trans_table { 1555 bool update; 1556 }; 1557 1558 #define nft_trans_table_update(trans) \ 1559 (((struct nft_trans_table *)trans->data)->update) 1560 1561 struct nft_trans_elem { 1562 struct nft_set *set; 1563 struct nft_set_elem elem; 1564 bool bound; 1565 }; 1566 1567 #define nft_trans_elem_set(trans) \ 1568 (((struct nft_trans_elem *)trans->data)->set) 1569 #define nft_trans_elem(trans) \ 1570 (((struct nft_trans_elem *)trans->data)->elem) 1571 #define nft_trans_elem_set_bound(trans) \ 1572 (((struct nft_trans_elem *)trans->data)->bound) 1573 1574 struct nft_trans_obj { 1575 struct nft_object *obj; 1576 struct nft_object *newobj; 1577 bool update; 1578 }; 1579 1580 #define nft_trans_obj(trans) \ 1581 (((struct nft_trans_obj *)trans->data)->obj) 1582 #define nft_trans_obj_newobj(trans) \ 1583 (((struct nft_trans_obj *)trans->data)->newobj) 1584 #define nft_trans_obj_update(trans) \ 1585 (((struct nft_trans_obj *)trans->data)->update) 1586 1587 struct nft_trans_flowtable { 1588 struct nft_flowtable *flowtable; 1589 bool update; 1590 struct list_head hook_list; 1591 u32 flags; 1592 }; 1593 1594 #define nft_trans_flowtable(trans) \ 1595 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1596 #define nft_trans_flowtable_update(trans) \ 1597 (((struct nft_trans_flowtable *)trans->data)->update) 1598 #define nft_trans_flowtable_hooks(trans) \ 1599 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1600 #define nft_trans_flowtable_flags(trans) \ 1601 (((struct nft_trans_flowtable *)trans->data)->flags) 1602 1603 int __init nft_chain_filter_init(void); 1604 void nft_chain_filter_fini(void); 1605 1606 void __init nft_chain_route_init(void); 1607 void nft_chain_route_fini(void); 1608 1609 void nf_tables_trans_destroy_flush_work(void); 1610 1611 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1612 __be64 nf_jiffies64_to_msecs(u64 input); 1613 1614 #ifdef CONFIG_MODULES 1615 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...); 1616 #else 1617 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; } 1618 #endif 1619 1620 struct nftables_pernet { 1621 struct list_head tables; 1622 struct list_head commit_list; 1623 struct list_head module_list; 1624 struct list_head notify_list; 1625 struct mutex commit_mutex; 1626 unsigned int base_seq; 1627 u8 validate_state; 1628 }; 1629 1630 extern unsigned int nf_tables_net_id; 1631 1632 static inline struct nftables_pernet *nft_pernet(const struct net *net) 1633 { 1634 return net_generic(net, nf_tables_net_id); 1635 } 1636 1637 #define __NFT_REDUCE_READONLY 1UL 1638 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY 1639 1640 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr) 1641 { 1642 return expr->ops->reduce == NFT_REDUCE_READONLY; 1643 } 1644 1645 void nft_reg_track_update(struct nft_regs_track *track, 1646 const struct nft_expr *expr, u8 dreg, u8 len); 1647 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len); 1648 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg); 1649 1650 static inline bool nft_reg_track_cmp(struct nft_regs_track *track, 1651 const struct nft_expr *expr, u8 dreg) 1652 { 1653 return track->regs[dreg].selector && 1654 track->regs[dreg].selector->ops == expr->ops && 1655 track->regs[dreg].num_reg == 0; 1656 } 1657 1658 #endif /* _NET_NF_TABLES_H */ 1659