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 void nft_reg_store_be16(u32 *dreg, __be16 val) 161 { 162 nft_reg_store16(dreg, (__force __u16)val); 163 } 164 165 static inline u16 nft_reg_load16(const u32 *sreg) 166 { 167 return *(u16 *)sreg; 168 } 169 170 static inline __be16 nft_reg_load_be16(const u32 *sreg) 171 { 172 return (__force __be16)nft_reg_load16(sreg); 173 } 174 175 static inline __be32 nft_reg_load_be32(const u32 *sreg) 176 { 177 return *(__force __be32 *)sreg; 178 } 179 180 static inline void nft_reg_store64(u32 *dreg, u64 val) 181 { 182 put_unaligned(val, (u64 *)dreg); 183 } 184 185 static inline u64 nft_reg_load64(const u32 *sreg) 186 { 187 return get_unaligned((u64 *)sreg); 188 } 189 190 static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 191 unsigned int len) 192 { 193 if (len % NFT_REG32_SIZE) 194 dst[len / NFT_REG32_SIZE] = 0; 195 memcpy(dst, src, len); 196 } 197 198 /** 199 * struct nft_ctx - nf_tables rule/set context 200 * 201 * @net: net namespace 202 * @table: the table the chain is contained in 203 * @chain: the chain the rule is contained in 204 * @nla: netlink attributes 205 * @portid: netlink portID of the original message 206 * @seq: netlink sequence number 207 * @family: protocol family 208 * @level: depth of the chains 209 * @report: notify via unicast netlink message 210 */ 211 struct nft_ctx { 212 struct net *net; 213 struct nft_table *table; 214 struct nft_chain *chain; 215 const struct nlattr * const *nla; 216 u32 portid; 217 u32 seq; 218 u16 flags; 219 u8 family; 220 u8 level; 221 bool report; 222 }; 223 224 enum nft_data_desc_flags { 225 NFT_DATA_DESC_SETELEM = (1 << 0), 226 }; 227 228 struct nft_data_desc { 229 enum nft_data_types type; 230 unsigned int size; 231 unsigned int len; 232 unsigned int flags; 233 }; 234 235 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, 236 struct nft_data_desc *desc, const struct nlattr *nla); 237 void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 238 void nft_data_release(const struct nft_data *data, enum nft_data_types type); 239 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 240 enum nft_data_types type, unsigned int len); 241 242 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 243 { 244 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 245 } 246 247 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 248 { 249 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 250 } 251 252 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 253 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 254 255 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len); 256 int nft_parse_register_store(const struct nft_ctx *ctx, 257 const struct nlattr *attr, u8 *dreg, 258 const struct nft_data *data, 259 enum nft_data_types type, unsigned int len); 260 261 /** 262 * struct nft_userdata - user defined data associated with an object 263 * 264 * @len: length of the data 265 * @data: content 266 * 267 * The presence of user data is indicated in an object specific fashion, 268 * so a length of zero can't occur and the value "len" indicates data 269 * of length len + 1. 270 */ 271 struct nft_userdata { 272 u8 len; 273 unsigned char data[]; 274 }; 275 276 /** 277 * struct nft_set_elem - generic representation of set elements 278 * 279 * @key: element key 280 * @key_end: closing element key 281 * @priv: element private data and extensions 282 */ 283 struct nft_set_elem { 284 union { 285 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 286 struct nft_data val; 287 } key; 288 union { 289 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 290 struct nft_data val; 291 } key_end; 292 union { 293 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 294 struct nft_data val; 295 } data; 296 void *priv; 297 }; 298 299 struct nft_set; 300 struct nft_set_iter { 301 u8 genmask; 302 unsigned int count; 303 unsigned int skip; 304 int err; 305 int (*fn)(const struct nft_ctx *ctx, 306 struct nft_set *set, 307 const struct nft_set_iter *iter, 308 struct nft_set_elem *elem); 309 }; 310 311 /** 312 * struct nft_set_desc - description of set elements 313 * 314 * @klen: key length 315 * @dlen: data length 316 * @size: number of set elements 317 * @field_len: length of each field in concatenation, bytes 318 * @field_count: number of concatenated fields in element 319 * @expr: set must support for expressions 320 */ 321 struct nft_set_desc { 322 unsigned int klen; 323 unsigned int dlen; 324 unsigned int size; 325 u8 field_len[NFT_REG32_COUNT]; 326 u8 field_count; 327 bool expr; 328 }; 329 330 /** 331 * enum nft_set_class - performance class 332 * 333 * @NFT_LOOKUP_O_1: constant, O(1) 334 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) 335 * @NFT_LOOKUP_O_N: linear, O(N) 336 */ 337 enum nft_set_class { 338 NFT_SET_CLASS_O_1, 339 NFT_SET_CLASS_O_LOG_N, 340 NFT_SET_CLASS_O_N, 341 }; 342 343 /** 344 * struct nft_set_estimate - estimation of memory and performance 345 * characteristics 346 * 347 * @size: required memory 348 * @lookup: lookup performance class 349 * @space: memory class 350 */ 351 struct nft_set_estimate { 352 u64 size; 353 enum nft_set_class lookup; 354 enum nft_set_class space; 355 }; 356 357 #define NFT_EXPR_MAXATTR 16 358 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 359 ALIGN(size, __alignof__(struct nft_expr))) 360 361 /** 362 * struct nft_expr - nf_tables expression 363 * 364 * @ops: expression ops 365 * @data: expression private data 366 */ 367 struct nft_expr { 368 const struct nft_expr_ops *ops; 369 unsigned char data[] 370 __attribute__((aligned(__alignof__(u64)))); 371 }; 372 373 static inline void *nft_expr_priv(const struct nft_expr *expr) 374 { 375 return (void *)expr->data; 376 } 377 378 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); 379 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 380 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 381 const struct nft_expr *expr); 382 bool nft_expr_reduce_bitwise(struct nft_regs_track *track, 383 const struct nft_expr *expr); 384 385 struct nft_set_ext; 386 387 /** 388 * struct nft_set_ops - nf_tables set operations 389 * 390 * @lookup: look up an element within the set 391 * @update: update an element if exists, add it if doesn't exist 392 * @delete: delete an element 393 * @insert: insert new element into set 394 * @activate: activate new element in the next generation 395 * @deactivate: lookup for element and deactivate it in the next generation 396 * @flush: deactivate element in the next generation 397 * @remove: remove element from set 398 * @walk: iterate over all set elements 399 * @get: get set elements 400 * @privsize: function to return size of set private data 401 * @init: initialize private data of new set instance 402 * @destroy: destroy private data of set instance 403 * @elemsize: element private size 404 * 405 * Operations lookup, update and delete have simpler interfaces, are faster 406 * and currently only used in the packet path. All the rest are slower, 407 * control plane functions. 408 */ 409 struct nft_set_ops { 410 bool (*lookup)(const struct net *net, 411 const struct nft_set *set, 412 const u32 *key, 413 const struct nft_set_ext **ext); 414 bool (*update)(struct nft_set *set, 415 const u32 *key, 416 void *(*new)(struct nft_set *, 417 const struct nft_expr *, 418 struct nft_regs *), 419 const struct nft_expr *expr, 420 struct nft_regs *regs, 421 const struct nft_set_ext **ext); 422 bool (*delete)(const struct nft_set *set, 423 const u32 *key); 424 425 int (*insert)(const struct net *net, 426 const struct nft_set *set, 427 const struct nft_set_elem *elem, 428 struct nft_set_ext **ext); 429 void (*activate)(const struct net *net, 430 const struct nft_set *set, 431 const struct nft_set_elem *elem); 432 void * (*deactivate)(const struct net *net, 433 const struct nft_set *set, 434 const struct nft_set_elem *elem); 435 bool (*flush)(const struct net *net, 436 const struct nft_set *set, 437 void *priv); 438 void (*remove)(const struct net *net, 439 const struct nft_set *set, 440 const struct nft_set_elem *elem); 441 void (*walk)(const struct nft_ctx *ctx, 442 struct nft_set *set, 443 struct nft_set_iter *iter); 444 void * (*get)(const struct net *net, 445 const struct nft_set *set, 446 const struct nft_set_elem *elem, 447 unsigned int flags); 448 449 u64 (*privsize)(const struct nlattr * const nla[], 450 const struct nft_set_desc *desc); 451 bool (*estimate)(const struct nft_set_desc *desc, 452 u32 features, 453 struct nft_set_estimate *est); 454 int (*init)(const struct nft_set *set, 455 const struct nft_set_desc *desc, 456 const struct nlattr * const nla[]); 457 void (*destroy)(const struct nft_set *set); 458 void (*gc_init)(const struct nft_set *set); 459 460 unsigned int elemsize; 461 }; 462 463 /** 464 * struct nft_set_type - nf_tables set type 465 * 466 * @ops: set ops for this type 467 * @features: features supported by the implementation 468 */ 469 struct nft_set_type { 470 const struct nft_set_ops ops; 471 u32 features; 472 }; 473 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 474 475 struct nft_set_elem_expr { 476 u8 size; 477 unsigned char data[] 478 __attribute__((aligned(__alignof__(struct nft_expr)))); 479 }; 480 481 #define nft_setelem_expr_at(__elem_expr, __offset) \ 482 ((struct nft_expr *)&__elem_expr->data[__offset]) 483 484 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 485 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 486 __size < (__elem_expr)->size; \ 487 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 488 489 #define NFT_SET_EXPR_MAX 2 490 491 /** 492 * struct nft_set - nf_tables set instance 493 * 494 * @list: table set list node 495 * @bindings: list of set bindings 496 * @table: table this set belongs to 497 * @net: netnamespace this set belongs to 498 * @name: name of the set 499 * @handle: unique handle of the set 500 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 501 * @dtype: data type (verdict or numeric type defined by userspace) 502 * @objtype: object type (see NFT_OBJECT_* definitions) 503 * @size: maximum set size 504 * @field_len: length of each field in concatenation, bytes 505 * @field_count: number of concatenated fields in element 506 * @use: number of rules references to this set 507 * @nelems: number of elements 508 * @ndeact: number of deactivated elements queued for removal 509 * @timeout: default timeout value in jiffies 510 * @gc_int: garbage collection interval in msecs 511 * @policy: set parameterization (see enum nft_set_policies) 512 * @udlen: user data length 513 * @udata: user data 514 * @expr: stateful expression 515 * @ops: set ops 516 * @flags: set flags 517 * @genmask: generation mask 518 * @klen: key length 519 * @dlen: data length 520 * @data: private set data 521 */ 522 struct nft_set { 523 struct list_head list; 524 struct list_head bindings; 525 struct nft_table *table; 526 possible_net_t net; 527 char *name; 528 u64 handle; 529 u32 ktype; 530 u32 dtype; 531 u32 objtype; 532 u32 size; 533 u8 field_len[NFT_REG32_COUNT]; 534 u8 field_count; 535 u32 use; 536 atomic_t nelems; 537 u32 ndeact; 538 u64 timeout; 539 u32 gc_int; 540 u16 policy; 541 u16 udlen; 542 unsigned char *udata; 543 /* runtime data below here */ 544 const struct nft_set_ops *ops ____cacheline_aligned; 545 u16 flags:14, 546 genmask:2; 547 u8 klen; 548 u8 dlen; 549 u8 num_exprs; 550 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 551 struct list_head catchall_list; 552 unsigned char data[] 553 __attribute__((aligned(__alignof__(u64)))); 554 }; 555 556 static inline bool nft_set_is_anonymous(const struct nft_set *set) 557 { 558 return set->flags & NFT_SET_ANONYMOUS; 559 } 560 561 static inline void *nft_set_priv(const struct nft_set *set) 562 { 563 return (void *)set->data; 564 } 565 566 static inline struct nft_set *nft_set_container_of(const void *priv) 567 { 568 return (void *)priv - offsetof(struct nft_set, data); 569 } 570 571 struct nft_set *nft_set_lookup_global(const struct net *net, 572 const struct nft_table *table, 573 const struct nlattr *nla_set_name, 574 const struct nlattr *nla_set_id, 575 u8 genmask); 576 577 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 578 const struct nft_set *set); 579 void *nft_set_catchall_gc(const struct nft_set *set); 580 581 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 582 { 583 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; 584 } 585 586 /** 587 * struct nft_set_binding - nf_tables set binding 588 * 589 * @list: set bindings list node 590 * @chain: chain containing the rule bound to the set 591 * @flags: set action flags 592 * 593 * A set binding contains all information necessary for validation 594 * of new elements added to a bound set. 595 */ 596 struct nft_set_binding { 597 struct list_head list; 598 const struct nft_chain *chain; 599 u32 flags; 600 }; 601 602 enum nft_trans_phase; 603 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 604 struct nft_set_binding *binding, 605 enum nft_trans_phase phase); 606 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 607 struct nft_set_binding *binding); 608 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 609 610 /** 611 * enum nft_set_extensions - set extension type IDs 612 * 613 * @NFT_SET_EXT_KEY: element key 614 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 615 * @NFT_SET_EXT_DATA: mapping data 616 * @NFT_SET_EXT_FLAGS: element flags 617 * @NFT_SET_EXT_TIMEOUT: element timeout 618 * @NFT_SET_EXT_EXPIRATION: element expiration time 619 * @NFT_SET_EXT_USERDATA: user data associated with the element 620 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 621 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 622 * @NFT_SET_EXT_NUM: number of extension types 623 */ 624 enum nft_set_extensions { 625 NFT_SET_EXT_KEY, 626 NFT_SET_EXT_KEY_END, 627 NFT_SET_EXT_DATA, 628 NFT_SET_EXT_FLAGS, 629 NFT_SET_EXT_TIMEOUT, 630 NFT_SET_EXT_EXPIRATION, 631 NFT_SET_EXT_USERDATA, 632 NFT_SET_EXT_EXPRESSIONS, 633 NFT_SET_EXT_OBJREF, 634 NFT_SET_EXT_NUM 635 }; 636 637 /** 638 * struct nft_set_ext_type - set extension type 639 * 640 * @len: fixed part length of the extension 641 * @align: alignment requirements of the extension 642 */ 643 struct nft_set_ext_type { 644 u8 len; 645 u8 align; 646 }; 647 648 extern const struct nft_set_ext_type nft_set_ext_types[]; 649 650 /** 651 * struct nft_set_ext_tmpl - set extension template 652 * 653 * @len: length of extension area 654 * @offset: offsets of individual extension types 655 */ 656 struct nft_set_ext_tmpl { 657 u16 len; 658 u8 offset[NFT_SET_EXT_NUM]; 659 u8 ext_len[NFT_SET_EXT_NUM]; 660 }; 661 662 /** 663 * struct nft_set_ext - set extensions 664 * 665 * @genmask: generation mask 666 * @offset: offsets of individual extension types 667 * @data: beginning of extension data 668 */ 669 struct nft_set_ext { 670 u8 genmask; 671 u8 offset[NFT_SET_EXT_NUM]; 672 char data[]; 673 }; 674 675 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 676 { 677 memset(tmpl, 0, sizeof(*tmpl)); 678 tmpl->len = sizeof(struct nft_set_ext); 679 } 680 681 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 682 unsigned int len) 683 { 684 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 685 if (tmpl->len > U8_MAX) 686 return -EINVAL; 687 688 tmpl->offset[id] = tmpl->len; 689 tmpl->ext_len[id] = nft_set_ext_types[id].len + len; 690 tmpl->len += tmpl->ext_len[id]; 691 692 return 0; 693 } 694 695 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 696 { 697 return nft_set_ext_add_length(tmpl, id, 0); 698 } 699 700 static inline void nft_set_ext_init(struct nft_set_ext *ext, 701 const struct nft_set_ext_tmpl *tmpl) 702 { 703 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 704 } 705 706 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 707 { 708 return !!ext->offset[id]; 709 } 710 711 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 712 { 713 return ext && __nft_set_ext_exists(ext, id); 714 } 715 716 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 717 { 718 return (void *)ext + ext->offset[id]; 719 } 720 721 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 722 { 723 return nft_set_ext(ext, NFT_SET_EXT_KEY); 724 } 725 726 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 727 { 728 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 729 } 730 731 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 732 { 733 return nft_set_ext(ext, NFT_SET_EXT_DATA); 734 } 735 736 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 737 { 738 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 739 } 740 741 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 742 { 743 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 744 } 745 746 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 747 { 748 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 749 } 750 751 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 752 { 753 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 754 } 755 756 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 757 { 758 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 759 } 760 761 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 762 { 763 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 764 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 765 } 766 767 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 768 void *elem) 769 { 770 return elem + set->ops->elemsize; 771 } 772 773 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 774 { 775 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 776 } 777 778 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 779 const struct nft_set *set, 780 const struct nlattr *attr); 781 782 void *nft_set_elem_init(const struct nft_set *set, 783 const struct nft_set_ext_tmpl *tmpl, 784 const u32 *key, const u32 *key_end, const u32 *data, 785 u64 timeout, u64 expiration, gfp_t gfp); 786 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 787 struct nft_expr *expr_array[]); 788 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 789 bool destroy_expr); 790 791 /** 792 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch 793 * 794 * @rcu: rcu head 795 * @set: set the elements belong to 796 * @cnt: count of elements 797 */ 798 struct nft_set_gc_batch_head { 799 struct rcu_head rcu; 800 const struct nft_set *set; 801 unsigned int cnt; 802 }; 803 804 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ 805 sizeof(struct nft_set_gc_batch_head)) / \ 806 sizeof(void *)) 807 808 /** 809 * struct nft_set_gc_batch - nf_tables set garbage collection batch 810 * 811 * @head: GC batch head 812 * @elems: garbage collection elements 813 */ 814 struct nft_set_gc_batch { 815 struct nft_set_gc_batch_head head; 816 void *elems[NFT_SET_GC_BATCH_SIZE]; 817 }; 818 819 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 820 gfp_t gfp); 821 void nft_set_gc_batch_release(struct rcu_head *rcu); 822 823 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) 824 { 825 if (gcb != NULL) 826 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); 827 } 828 829 static inline struct nft_set_gc_batch * 830 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, 831 gfp_t gfp) 832 { 833 if (gcb != NULL) { 834 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) 835 return gcb; 836 nft_set_gc_batch_complete(gcb); 837 } 838 return nft_set_gc_batch_alloc(set, gfp); 839 } 840 841 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, 842 void *elem) 843 { 844 gcb->elems[gcb->head.cnt++] = elem; 845 } 846 847 struct nft_expr_ops; 848 /** 849 * struct nft_expr_type - nf_tables expression type 850 * 851 * @select_ops: function to select nft_expr_ops 852 * @release_ops: release nft_expr_ops 853 * @ops: default ops, used when no select_ops functions is present 854 * @list: used internally 855 * @name: Identifier 856 * @owner: module reference 857 * @policy: netlink attribute policy 858 * @maxattr: highest netlink attribute number 859 * @family: address family for AF-specific types 860 * @flags: expression type flags 861 */ 862 struct nft_expr_type { 863 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 864 const struct nlattr * const tb[]); 865 void (*release_ops)(const struct nft_expr_ops *ops); 866 const struct nft_expr_ops *ops; 867 struct list_head list; 868 const char *name; 869 struct module *owner; 870 const struct nla_policy *policy; 871 unsigned int maxattr; 872 u8 family; 873 u8 flags; 874 }; 875 876 #define NFT_EXPR_STATEFUL 0x1 877 #define NFT_EXPR_GC 0x2 878 879 enum nft_trans_phase { 880 NFT_TRANS_PREPARE, 881 NFT_TRANS_ABORT, 882 NFT_TRANS_COMMIT, 883 NFT_TRANS_RELEASE 884 }; 885 886 struct nft_flow_rule; 887 struct nft_offload_ctx; 888 889 /** 890 * struct nft_expr_ops - nf_tables expression operations 891 * 892 * @eval: Expression evaluation function 893 * @size: full expression size, including private data size 894 * @init: initialization function 895 * @activate: activate expression in the next generation 896 * @deactivate: deactivate expression in next generation 897 * @destroy: destruction function, called after synchronize_rcu 898 * @dump: function to dump parameters 899 * @type: expression type 900 * @validate: validate expression, called during loop detection 901 * @data: extra data to attach to this expression operation 902 */ 903 struct nft_expr_ops { 904 void (*eval)(const struct nft_expr *expr, 905 struct nft_regs *regs, 906 const struct nft_pktinfo *pkt); 907 int (*clone)(struct nft_expr *dst, 908 const struct nft_expr *src); 909 unsigned int size; 910 911 int (*init)(const struct nft_ctx *ctx, 912 const struct nft_expr *expr, 913 const struct nlattr * const tb[]); 914 void (*activate)(const struct nft_ctx *ctx, 915 const struct nft_expr *expr); 916 void (*deactivate)(const struct nft_ctx *ctx, 917 const struct nft_expr *expr, 918 enum nft_trans_phase phase); 919 void (*destroy)(const struct nft_ctx *ctx, 920 const struct nft_expr *expr); 921 void (*destroy_clone)(const struct nft_ctx *ctx, 922 const struct nft_expr *expr); 923 int (*dump)(struct sk_buff *skb, 924 const struct nft_expr *expr); 925 int (*validate)(const struct nft_ctx *ctx, 926 const struct nft_expr *expr, 927 const struct nft_data **data); 928 bool (*reduce)(struct nft_regs_track *track, 929 const struct nft_expr *expr); 930 bool (*gc)(struct net *net, 931 const struct nft_expr *expr); 932 int (*offload)(struct nft_offload_ctx *ctx, 933 struct nft_flow_rule *flow, 934 const struct nft_expr *expr); 935 bool (*offload_action)(const struct nft_expr *expr); 936 void (*offload_stats)(struct nft_expr *expr, 937 const struct flow_stats *stats); 938 const struct nft_expr_type *type; 939 void *data; 940 }; 941 942 /** 943 * struct nft_rule - nf_tables rule 944 * 945 * @list: used internally 946 * @handle: rule handle 947 * @genmask: generation mask 948 * @dlen: length of expression data 949 * @udata: user data is appended to the rule 950 * @data: expression data 951 */ 952 struct nft_rule { 953 struct list_head list; 954 u64 handle:42, 955 genmask:2, 956 dlen:12, 957 udata:1; 958 unsigned char data[] 959 __attribute__((aligned(__alignof__(struct nft_expr)))); 960 }; 961 962 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 963 { 964 return (struct nft_expr *)&rule->data[0]; 965 } 966 967 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 968 { 969 return ((void *)expr) + expr->ops->size; 970 } 971 972 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 973 { 974 return (struct nft_expr *)&rule->data[rule->dlen]; 975 } 976 977 static inline bool nft_expr_more(const struct nft_rule *rule, 978 const struct nft_expr *expr) 979 { 980 return expr != nft_expr_last(rule) && expr->ops; 981 } 982 983 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 984 { 985 return (void *)&rule->data[rule->dlen]; 986 } 987 988 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule); 989 990 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 991 struct nft_regs *regs, 992 const struct nft_pktinfo *pkt) 993 { 994 struct nft_set_elem_expr *elem_expr; 995 struct nft_expr *expr; 996 u32 size; 997 998 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 999 elem_expr = nft_set_ext_expr(ext); 1000 nft_setelem_expr_foreach(expr, elem_expr, size) { 1001 expr->ops->eval(expr, regs, pkt); 1002 if (regs->verdict.code == NFT_BREAK) 1003 return; 1004 } 1005 } 1006 } 1007 1008 /* 1009 * The last pointer isn't really necessary, but the compiler isn't able to 1010 * determine that the result of nft_expr_last() is always the same since it 1011 * can't assume that the dlen value wasn't changed within calls in the loop. 1012 */ 1013 #define nft_rule_for_each_expr(expr, last, rule) \ 1014 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 1015 (expr) != (last); \ 1016 (expr) = nft_expr_next(expr)) 1017 1018 #define NFT_CHAIN_POLICY_UNSET U8_MAX 1019 1020 struct nft_rule_dp { 1021 u64 is_last:1, 1022 dlen:12, 1023 handle:42; /* for tracing */ 1024 unsigned char data[] 1025 __attribute__((aligned(__alignof__(struct nft_expr)))); 1026 }; 1027 1028 struct nft_rule_blob { 1029 unsigned long size; 1030 unsigned char data[] 1031 __attribute__((aligned(__alignof__(struct nft_rule_dp)))); 1032 }; 1033 1034 /** 1035 * struct nft_chain - nf_tables chain 1036 * 1037 * @rules: list of rules in the chain 1038 * @list: used internally 1039 * @rhlhead: used internally 1040 * @table: table that this chain belongs to 1041 * @handle: chain handle 1042 * @use: number of jump references to this chain 1043 * @flags: bitmask of enum nft_chain_flags 1044 * @name: name of the chain 1045 */ 1046 struct nft_chain { 1047 struct nft_rule_blob __rcu *blob_gen_0; 1048 struct nft_rule_blob __rcu *blob_gen_1; 1049 struct list_head rules; 1050 struct list_head list; 1051 struct rhlist_head rhlhead; 1052 struct nft_table *table; 1053 u64 handle; 1054 u32 use; 1055 u8 flags:5, 1056 bound:1, 1057 genmask:2; 1058 char *name; 1059 u16 udlen; 1060 u8 *udata; 1061 1062 /* Only used during control plane commit phase: */ 1063 struct nft_rule_blob *blob_next; 1064 }; 1065 1066 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 1067 1068 enum nft_chain_types { 1069 NFT_CHAIN_T_DEFAULT = 0, 1070 NFT_CHAIN_T_ROUTE, 1071 NFT_CHAIN_T_NAT, 1072 NFT_CHAIN_T_MAX 1073 }; 1074 1075 /** 1076 * struct nft_chain_type - nf_tables chain type info 1077 * 1078 * @name: name of the type 1079 * @type: numeric identifier 1080 * @family: address family 1081 * @owner: module owner 1082 * @hook_mask: mask of valid hooks 1083 * @hooks: array of hook functions 1084 * @ops_register: base chain register function 1085 * @ops_unregister: base chain unregister function 1086 */ 1087 struct nft_chain_type { 1088 const char *name; 1089 enum nft_chain_types type; 1090 int family; 1091 struct module *owner; 1092 unsigned int hook_mask; 1093 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1094 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1095 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1096 }; 1097 1098 int nft_chain_validate_dependency(const struct nft_chain *chain, 1099 enum nft_chain_types type); 1100 int nft_chain_validate_hooks(const struct nft_chain *chain, 1101 unsigned int hook_flags); 1102 1103 static inline bool nft_chain_is_bound(struct nft_chain *chain) 1104 { 1105 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1106 } 1107 1108 void nft_chain_del(struct nft_chain *chain); 1109 void nf_tables_chain_destroy(struct nft_ctx *ctx); 1110 1111 struct nft_stats { 1112 u64 bytes; 1113 u64 pkts; 1114 struct u64_stats_sync syncp; 1115 }; 1116 1117 struct nft_hook { 1118 struct list_head list; 1119 struct nf_hook_ops ops; 1120 struct rcu_head rcu; 1121 }; 1122 1123 /** 1124 * struct nft_base_chain - nf_tables base chain 1125 * 1126 * @ops: netfilter hook ops 1127 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1128 * @type: chain type 1129 * @policy: default policy 1130 * @stats: per-cpu chain stats 1131 * @chain: the chain 1132 * @flow_block: flow block (for hardware offload) 1133 */ 1134 struct nft_base_chain { 1135 struct nf_hook_ops ops; 1136 struct list_head hook_list; 1137 const struct nft_chain_type *type; 1138 u8 policy; 1139 u8 flags; 1140 struct nft_stats __percpu *stats; 1141 struct nft_chain chain; 1142 struct flow_block flow_block; 1143 }; 1144 1145 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1146 { 1147 return container_of(chain, struct nft_base_chain, chain); 1148 } 1149 1150 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1151 { 1152 return chain->flags & NFT_CHAIN_BASE; 1153 } 1154 1155 int __nft_release_basechain(struct nft_ctx *ctx); 1156 1157 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1158 1159 /** 1160 * struct nft_table - nf_tables table 1161 * 1162 * @list: used internally 1163 * @chains_ht: chains in the table 1164 * @chains: same, for stable walks 1165 * @sets: sets in the table 1166 * @objects: stateful objects in the table 1167 * @flowtables: flow tables in the table 1168 * @hgenerator: handle generator state 1169 * @handle: table handle 1170 * @use: number of chain references to this table 1171 * @flags: table flag (see enum nft_table_flags) 1172 * @genmask: generation mask 1173 * @afinfo: address family info 1174 * @name: name of the table 1175 */ 1176 struct nft_table { 1177 struct list_head list; 1178 struct rhltable chains_ht; 1179 struct list_head chains; 1180 struct list_head sets; 1181 struct list_head objects; 1182 struct list_head flowtables; 1183 u64 hgenerator; 1184 u64 handle; 1185 u32 use; 1186 u16 family:6, 1187 flags:8, 1188 genmask:2; 1189 u32 nlpid; 1190 char *name; 1191 u16 udlen; 1192 u8 *udata; 1193 }; 1194 1195 static inline bool nft_table_has_owner(const struct nft_table *table) 1196 { 1197 return table->flags & NFT_TABLE_F_OWNER; 1198 } 1199 1200 static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1201 { 1202 return family == NFPROTO_NETDEV || 1203 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1204 } 1205 1206 void nft_register_chain_type(const struct nft_chain_type *); 1207 void nft_unregister_chain_type(const struct nft_chain_type *); 1208 1209 int nft_register_expr(struct nft_expr_type *); 1210 void nft_unregister_expr(struct nft_expr_type *); 1211 1212 int nft_verdict_dump(struct sk_buff *skb, int type, 1213 const struct nft_verdict *v); 1214 1215 /** 1216 * struct nft_object_hash_key - key to lookup nft_object 1217 * 1218 * @name: name of the stateful object to look up 1219 * @table: table the object belongs to 1220 */ 1221 struct nft_object_hash_key { 1222 const char *name; 1223 const struct nft_table *table; 1224 }; 1225 1226 /** 1227 * struct nft_object - nf_tables stateful object 1228 * 1229 * @list: table stateful object list node 1230 * @key: keys that identify this object 1231 * @rhlhead: nft_objname_ht node 1232 * @genmask: generation mask 1233 * @use: number of references to this stateful object 1234 * @handle: unique object handle 1235 * @ops: object operations 1236 * @data: object data, layout depends on type 1237 */ 1238 struct nft_object { 1239 struct list_head list; 1240 struct rhlist_head rhlhead; 1241 struct nft_object_hash_key key; 1242 u32 genmask:2, 1243 use:30; 1244 u64 handle; 1245 u16 udlen; 1246 u8 *udata; 1247 /* runtime data below here */ 1248 const struct nft_object_ops *ops ____cacheline_aligned; 1249 unsigned char data[] 1250 __attribute__((aligned(__alignof__(u64)))); 1251 }; 1252 1253 static inline void *nft_obj_data(const struct nft_object *obj) 1254 { 1255 return (void *)obj->data; 1256 } 1257 1258 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1259 1260 struct nft_object *nft_obj_lookup(const struct net *net, 1261 const struct nft_table *table, 1262 const struct nlattr *nla, u32 objtype, 1263 u8 genmask); 1264 1265 void nft_obj_notify(struct net *net, const struct nft_table *table, 1266 struct nft_object *obj, u32 portid, u32 seq, 1267 int event, u16 flags, int family, int report, gfp_t gfp); 1268 1269 /** 1270 * struct nft_object_type - stateful object type 1271 * 1272 * @select_ops: function to select nft_object_ops 1273 * @ops: default ops, used when no select_ops functions is present 1274 * @list: list node in list of object types 1275 * @type: stateful object numeric type 1276 * @owner: module owner 1277 * @maxattr: maximum netlink attribute 1278 * @policy: netlink attribute policy 1279 */ 1280 struct nft_object_type { 1281 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1282 const struct nlattr * const tb[]); 1283 const struct nft_object_ops *ops; 1284 struct list_head list; 1285 u32 type; 1286 unsigned int maxattr; 1287 struct module *owner; 1288 const struct nla_policy *policy; 1289 }; 1290 1291 /** 1292 * struct nft_object_ops - stateful object operations 1293 * 1294 * @eval: stateful object evaluation function 1295 * @size: stateful object size 1296 * @init: initialize object from netlink attributes 1297 * @destroy: release existing stateful object 1298 * @dump: netlink dump stateful object 1299 * @update: update stateful object 1300 */ 1301 struct nft_object_ops { 1302 void (*eval)(struct nft_object *obj, 1303 struct nft_regs *regs, 1304 const struct nft_pktinfo *pkt); 1305 unsigned int size; 1306 int (*init)(const struct nft_ctx *ctx, 1307 const struct nlattr *const tb[], 1308 struct nft_object *obj); 1309 void (*destroy)(const struct nft_ctx *ctx, 1310 struct nft_object *obj); 1311 int (*dump)(struct sk_buff *skb, 1312 struct nft_object *obj, 1313 bool reset); 1314 void (*update)(struct nft_object *obj, 1315 struct nft_object *newobj); 1316 const struct nft_object_type *type; 1317 }; 1318 1319 int nft_register_obj(struct nft_object_type *obj_type); 1320 void nft_unregister_obj(struct nft_object_type *obj_type); 1321 1322 #define NFT_NETDEVICE_MAX 256 1323 1324 /** 1325 * struct nft_flowtable - nf_tables flow table 1326 * 1327 * @list: flow table list node in table list 1328 * @table: the table the flow table is contained in 1329 * @name: name of this flow table 1330 * @hooknum: hook number 1331 * @ops_len: number of hooks in array 1332 * @genmask: generation mask 1333 * @use: number of references to this flow table 1334 * @handle: unique object handle 1335 * @dev_name: array of device names 1336 * @data: rhashtable and garbage collector 1337 * @ops: array of hooks 1338 */ 1339 struct nft_flowtable { 1340 struct list_head list; 1341 struct nft_table *table; 1342 char *name; 1343 int hooknum; 1344 int ops_len; 1345 u32 genmask:2, 1346 use:30; 1347 u64 handle; 1348 /* runtime data below here */ 1349 struct list_head hook_list ____cacheline_aligned; 1350 struct nf_flowtable data; 1351 }; 1352 1353 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1354 const struct nlattr *nla, 1355 u8 genmask); 1356 1357 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1358 struct nft_flowtable *flowtable, 1359 enum nft_trans_phase phase); 1360 1361 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1362 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1363 1364 /** 1365 * struct nft_traceinfo - nft tracing information and state 1366 * 1367 * @trace: other struct members are initialised 1368 * @nf_trace: copy of skb->nf_trace before rule evaluation 1369 * @type: event type (enum nft_trace_types) 1370 * @skbid: hash of skb to be used as trace id 1371 * @packet_dumped: packet headers sent in a previous traceinfo message 1372 * @pkt: pktinfo currently processed 1373 * @basechain: base chain currently processed 1374 * @chain: chain currently processed 1375 * @rule: rule that was evaluated 1376 * @verdict: verdict given by rule 1377 */ 1378 struct nft_traceinfo { 1379 bool trace; 1380 bool nf_trace; 1381 bool packet_dumped; 1382 enum nft_trace_types type:8; 1383 u32 skbid; 1384 const struct nft_pktinfo *pkt; 1385 const struct nft_base_chain *basechain; 1386 const struct nft_chain *chain; 1387 const struct nft_rule_dp *rule; 1388 const struct nft_verdict *verdict; 1389 }; 1390 1391 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1392 const struct nft_verdict *verdict, 1393 const struct nft_chain *basechain); 1394 1395 void nft_trace_notify(struct nft_traceinfo *info); 1396 1397 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1398 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1399 1400 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1401 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1402 1403 #define MODULE_ALIAS_NFT_EXPR(name) \ 1404 MODULE_ALIAS("nft-expr-" name) 1405 1406 #define MODULE_ALIAS_NFT_OBJ(type) \ 1407 MODULE_ALIAS("nft-obj-" __stringify(type)) 1408 1409 #if IS_ENABLED(CONFIG_NF_TABLES) 1410 1411 /* 1412 * The gencursor defines two generations, the currently active and the 1413 * next one. Objects contain a bitmask of 2 bits specifying the generations 1414 * they're active in. A set bit means they're inactive in the generation 1415 * represented by that bit. 1416 * 1417 * New objects start out as inactive in the current and active in the 1418 * next generation. When committing the ruleset the bitmask is cleared, 1419 * meaning they're active in all generations. When removing an object, 1420 * it is set inactive in the next generation. After committing the ruleset, 1421 * the objects are removed. 1422 */ 1423 static inline unsigned int nft_gencursor_next(const struct net *net) 1424 { 1425 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1426 } 1427 1428 static inline u8 nft_genmask_next(const struct net *net) 1429 { 1430 return 1 << nft_gencursor_next(net); 1431 } 1432 1433 static inline u8 nft_genmask_cur(const struct net *net) 1434 { 1435 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1436 return 1 << READ_ONCE(net->nft.gencursor); 1437 } 1438 1439 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1440 1441 /* 1442 * Generic transaction helpers 1443 */ 1444 1445 /* Check if this object is currently active. */ 1446 #define nft_is_active(__net, __obj) \ 1447 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1448 1449 /* Check if this object is active in the next generation. */ 1450 #define nft_is_active_next(__net, __obj) \ 1451 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1452 1453 /* This object becomes active in the next generation. */ 1454 #define nft_activate_next(__net, __obj) \ 1455 (__obj)->genmask = nft_genmask_cur(__net) 1456 1457 /* This object becomes inactive in the next generation. */ 1458 #define nft_deactivate_next(__net, __obj) \ 1459 (__obj)->genmask = nft_genmask_next(__net) 1460 1461 /* After committing the ruleset, clear the stale generation bit. */ 1462 #define nft_clear(__net, __obj) \ 1463 (__obj)->genmask &= ~nft_genmask_next(__net) 1464 #define nft_active_genmask(__obj, __genmask) \ 1465 !((__obj)->genmask & __genmask) 1466 1467 /* 1468 * Set element transaction helpers 1469 */ 1470 1471 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1472 u8 genmask) 1473 { 1474 return !(ext->genmask & genmask); 1475 } 1476 1477 static inline void nft_set_elem_change_active(const struct net *net, 1478 const struct nft_set *set, 1479 struct nft_set_ext *ext) 1480 { 1481 ext->genmask ^= nft_genmask_next(net); 1482 } 1483 1484 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1485 1486 /* 1487 * We use a free bit in the genmask field to indicate the element 1488 * is busy, meaning it is currently being processed either by 1489 * the netlink API or GC. 1490 * 1491 * Even though the genmask is only a single byte wide, this works 1492 * because the extension structure if fully constant once initialized, 1493 * so there are no non-atomic write accesses unless it is already 1494 * marked busy. 1495 */ 1496 #define NFT_SET_ELEM_BUSY_MASK (1 << 2) 1497 1498 #if defined(__LITTLE_ENDIAN_BITFIELD) 1499 #define NFT_SET_ELEM_BUSY_BIT 2 1500 #elif defined(__BIG_ENDIAN_BITFIELD) 1501 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1502 #else 1503 #error 1504 #endif 1505 1506 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) 1507 { 1508 unsigned long *word = (unsigned long *)ext; 1509 1510 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1511 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); 1512 } 1513 1514 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) 1515 { 1516 unsigned long *word = (unsigned long *)ext; 1517 1518 clear_bit(NFT_SET_ELEM_BUSY_BIT, word); 1519 } 1520 1521 /** 1522 * struct nft_trans - nf_tables object update in transaction 1523 * 1524 * @list: used internally 1525 * @msg_type: message type 1526 * @put_net: ctx->net needs to be put 1527 * @ctx: transaction context 1528 * @data: internal information related to the transaction 1529 */ 1530 struct nft_trans { 1531 struct list_head list; 1532 int msg_type; 1533 bool put_net; 1534 struct nft_ctx ctx; 1535 char data[]; 1536 }; 1537 1538 struct nft_trans_rule { 1539 struct nft_rule *rule; 1540 struct nft_flow_rule *flow; 1541 u32 rule_id; 1542 }; 1543 1544 #define nft_trans_rule(trans) \ 1545 (((struct nft_trans_rule *)trans->data)->rule) 1546 #define nft_trans_flow_rule(trans) \ 1547 (((struct nft_trans_rule *)trans->data)->flow) 1548 #define nft_trans_rule_id(trans) \ 1549 (((struct nft_trans_rule *)trans->data)->rule_id) 1550 1551 struct nft_trans_set { 1552 struct nft_set *set; 1553 u32 set_id; 1554 bool bound; 1555 }; 1556 1557 #define nft_trans_set(trans) \ 1558 (((struct nft_trans_set *)trans->data)->set) 1559 #define nft_trans_set_id(trans) \ 1560 (((struct nft_trans_set *)trans->data)->set_id) 1561 #define nft_trans_set_bound(trans) \ 1562 (((struct nft_trans_set *)trans->data)->bound) 1563 1564 struct nft_trans_chain { 1565 bool update; 1566 char *name; 1567 struct nft_stats __percpu *stats; 1568 u8 policy; 1569 u32 chain_id; 1570 }; 1571 1572 #define nft_trans_chain_update(trans) \ 1573 (((struct nft_trans_chain *)trans->data)->update) 1574 #define nft_trans_chain_name(trans) \ 1575 (((struct nft_trans_chain *)trans->data)->name) 1576 #define nft_trans_chain_stats(trans) \ 1577 (((struct nft_trans_chain *)trans->data)->stats) 1578 #define nft_trans_chain_policy(trans) \ 1579 (((struct nft_trans_chain *)trans->data)->policy) 1580 #define nft_trans_chain_id(trans) \ 1581 (((struct nft_trans_chain *)trans->data)->chain_id) 1582 1583 struct nft_trans_table { 1584 bool update; 1585 }; 1586 1587 #define nft_trans_table_update(trans) \ 1588 (((struct nft_trans_table *)trans->data)->update) 1589 1590 struct nft_trans_elem { 1591 struct nft_set *set; 1592 struct nft_set_elem elem; 1593 bool bound; 1594 }; 1595 1596 #define nft_trans_elem_set(trans) \ 1597 (((struct nft_trans_elem *)trans->data)->set) 1598 #define nft_trans_elem(trans) \ 1599 (((struct nft_trans_elem *)trans->data)->elem) 1600 #define nft_trans_elem_set_bound(trans) \ 1601 (((struct nft_trans_elem *)trans->data)->bound) 1602 1603 struct nft_trans_obj { 1604 struct nft_object *obj; 1605 struct nft_object *newobj; 1606 bool update; 1607 }; 1608 1609 #define nft_trans_obj(trans) \ 1610 (((struct nft_trans_obj *)trans->data)->obj) 1611 #define nft_trans_obj_newobj(trans) \ 1612 (((struct nft_trans_obj *)trans->data)->newobj) 1613 #define nft_trans_obj_update(trans) \ 1614 (((struct nft_trans_obj *)trans->data)->update) 1615 1616 struct nft_trans_flowtable { 1617 struct nft_flowtable *flowtable; 1618 bool update; 1619 struct list_head hook_list; 1620 u32 flags; 1621 }; 1622 1623 #define nft_trans_flowtable(trans) \ 1624 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1625 #define nft_trans_flowtable_update(trans) \ 1626 (((struct nft_trans_flowtable *)trans->data)->update) 1627 #define nft_trans_flowtable_hooks(trans) \ 1628 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1629 #define nft_trans_flowtable_flags(trans) \ 1630 (((struct nft_trans_flowtable *)trans->data)->flags) 1631 1632 int __init nft_chain_filter_init(void); 1633 void nft_chain_filter_fini(void); 1634 1635 void __init nft_chain_route_init(void); 1636 void nft_chain_route_fini(void); 1637 1638 void nf_tables_trans_destroy_flush_work(void); 1639 1640 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1641 __be64 nf_jiffies64_to_msecs(u64 input); 1642 1643 #ifdef CONFIG_MODULES 1644 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...); 1645 #else 1646 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; } 1647 #endif 1648 1649 struct nftables_pernet { 1650 struct list_head tables; 1651 struct list_head commit_list; 1652 struct list_head module_list; 1653 struct list_head notify_list; 1654 struct mutex commit_mutex; 1655 u64 table_handle; 1656 unsigned int base_seq; 1657 u8 validate_state; 1658 }; 1659 1660 extern unsigned int nf_tables_net_id; 1661 1662 static inline struct nftables_pernet *nft_pernet(const struct net *net) 1663 { 1664 return net_generic(net, nf_tables_net_id); 1665 } 1666 1667 #define __NFT_REDUCE_READONLY 1UL 1668 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY 1669 1670 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr) 1671 { 1672 return expr->ops->reduce == NFT_REDUCE_READONLY; 1673 } 1674 1675 void nft_reg_track_update(struct nft_regs_track *track, 1676 const struct nft_expr *expr, u8 dreg, u8 len); 1677 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len); 1678 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg); 1679 1680 static inline bool nft_reg_track_cmp(struct nft_regs_track *track, 1681 const struct nft_expr *expr, u8 dreg) 1682 { 1683 return track->regs[dreg].selector && 1684 track->regs[dreg].selector->ops == expr->ops && 1685 track->regs[dreg].num_reg == 0; 1686 } 1687 1688 #endif /* _NET_NF_TABLES_H */ 1689