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 17 #define NFT_MAX_HOOKS (NF_INET_INGRESS + 1) 18 19 struct module; 20 21 #define NFT_JUMP_STACK_SIZE 16 22 23 struct nft_pktinfo { 24 struct sk_buff *skb; 25 bool tprot_set; 26 u8 tprot; 27 /* for x_tables compatibility */ 28 struct xt_action_param xt; 29 }; 30 31 static inline struct net *nft_net(const struct nft_pktinfo *pkt) 32 { 33 return pkt->xt.state->net; 34 } 35 36 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) 37 { 38 return pkt->xt.state->hook; 39 } 40 41 static inline u8 nft_pf(const struct nft_pktinfo *pkt) 42 { 43 return pkt->xt.state->pf; 44 } 45 46 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) 47 { 48 return pkt->xt.state->in; 49 } 50 51 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) 52 { 53 return pkt->xt.state->out; 54 } 55 56 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, 57 struct sk_buff *skb, 58 const struct nf_hook_state *state) 59 { 60 pkt->skb = skb; 61 pkt->xt.state = state; 62 } 63 64 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt, 65 struct sk_buff *skb) 66 { 67 pkt->tprot_set = false; 68 pkt->tprot = 0; 69 pkt->xt.thoff = 0; 70 pkt->xt.fragoff = 0; 71 } 72 73 /** 74 * struct nft_verdict - nf_tables verdict 75 * 76 * @code: nf_tables/netfilter verdict code 77 * @chain: destination chain for NFT_JUMP/NFT_GOTO 78 */ 79 struct nft_verdict { 80 u32 code; 81 struct nft_chain *chain; 82 }; 83 84 struct nft_data { 85 union { 86 u32 data[4]; 87 struct nft_verdict verdict; 88 }; 89 } __attribute__((aligned(__alignof__(u64)))); 90 91 /** 92 * struct nft_regs - nf_tables register set 93 * 94 * @data: data registers 95 * @verdict: verdict register 96 * 97 * The first four data registers alias to the verdict register. 98 */ 99 struct nft_regs { 100 union { 101 u32 data[20]; 102 struct nft_verdict verdict; 103 }; 104 }; 105 106 /* Store/load an u8, u16 or u64 integer to/from the u32 data register. 107 * 108 * Note, when using concatenations, register allocation happens at 32-bit 109 * level. So for store instruction, pad the rest part with zero to avoid 110 * garbage values. 111 */ 112 113 static inline void nft_reg_store8(u32 *dreg, u8 val) 114 { 115 *dreg = 0; 116 *(u8 *)dreg = val; 117 } 118 119 static inline u8 nft_reg_load8(const u32 *sreg) 120 { 121 return *(u8 *)sreg; 122 } 123 124 static inline void nft_reg_store16(u32 *dreg, u16 val) 125 { 126 *dreg = 0; 127 *(u16 *)dreg = val; 128 } 129 130 static inline u16 nft_reg_load16(const u32 *sreg) 131 { 132 return *(u16 *)sreg; 133 } 134 135 static inline void nft_reg_store64(u32 *dreg, u64 val) 136 { 137 put_unaligned(val, (u64 *)dreg); 138 } 139 140 static inline u64 nft_reg_load64(const u32 *sreg) 141 { 142 return get_unaligned((u64 *)sreg); 143 } 144 145 static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 146 unsigned int len) 147 { 148 if (len % NFT_REG32_SIZE) 149 dst[len / NFT_REG32_SIZE] = 0; 150 memcpy(dst, src, len); 151 } 152 153 /** 154 * struct nft_ctx - nf_tables rule/set context 155 * 156 * @net: net namespace 157 * @table: the table the chain is contained in 158 * @chain: the chain the rule is contained in 159 * @nla: netlink attributes 160 * @portid: netlink portID of the original message 161 * @seq: netlink sequence number 162 * @family: protocol family 163 * @level: depth of the chains 164 * @report: notify via unicast netlink message 165 */ 166 struct nft_ctx { 167 struct net *net; 168 struct nft_table *table; 169 struct nft_chain *chain; 170 const struct nlattr * const *nla; 171 u32 portid; 172 u32 seq; 173 u16 flags; 174 u8 family; 175 u8 level; 176 bool report; 177 }; 178 179 struct nft_data_desc { 180 enum nft_data_types type; 181 unsigned int len; 182 }; 183 184 int nft_data_init(const struct nft_ctx *ctx, 185 struct nft_data *data, unsigned int size, 186 struct nft_data_desc *desc, const struct nlattr *nla); 187 void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 188 void nft_data_release(const struct nft_data *data, enum nft_data_types type); 189 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 190 enum nft_data_types type, unsigned int len); 191 192 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 193 { 194 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 195 } 196 197 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 198 { 199 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 200 } 201 202 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 203 unsigned int nft_parse_register(const struct nlattr *attr); 204 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 205 206 int nft_validate_register_load(enum nft_registers reg, unsigned int len); 207 int nft_validate_register_store(const struct nft_ctx *ctx, 208 enum nft_registers reg, 209 const struct nft_data *data, 210 enum nft_data_types type, unsigned int len); 211 212 /** 213 * struct nft_userdata - user defined data associated with an object 214 * 215 * @len: length of the data 216 * @data: content 217 * 218 * The presence of user data is indicated in an object specific fashion, 219 * so a length of zero can't occur and the value "len" indicates data 220 * of length len + 1. 221 */ 222 struct nft_userdata { 223 u8 len; 224 unsigned char data[]; 225 }; 226 227 /** 228 * struct nft_set_elem - generic representation of set elements 229 * 230 * @key: element key 231 * @key_end: closing element key 232 * @priv: element private data and extensions 233 */ 234 struct nft_set_elem { 235 union { 236 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 237 struct nft_data val; 238 } key; 239 union { 240 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 241 struct nft_data val; 242 } key_end; 243 union { 244 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 245 struct nft_data val; 246 } data; 247 void *priv; 248 }; 249 250 struct nft_set; 251 struct nft_set_iter { 252 u8 genmask; 253 unsigned int count; 254 unsigned int skip; 255 int err; 256 int (*fn)(const struct nft_ctx *ctx, 257 struct nft_set *set, 258 const struct nft_set_iter *iter, 259 struct nft_set_elem *elem); 260 }; 261 262 /** 263 * struct nft_set_desc - description of set elements 264 * 265 * @klen: key length 266 * @dlen: data length 267 * @size: number of set elements 268 * @field_len: length of each field in concatenation, bytes 269 * @field_count: number of concatenated fields in element 270 * @expr: set must support for expressions 271 */ 272 struct nft_set_desc { 273 unsigned int klen; 274 unsigned int dlen; 275 unsigned int size; 276 u8 field_len[NFT_REG32_COUNT]; 277 u8 field_count; 278 bool expr; 279 }; 280 281 /** 282 * enum nft_set_class - performance class 283 * 284 * @NFT_LOOKUP_O_1: constant, O(1) 285 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) 286 * @NFT_LOOKUP_O_N: linear, O(N) 287 */ 288 enum nft_set_class { 289 NFT_SET_CLASS_O_1, 290 NFT_SET_CLASS_O_LOG_N, 291 NFT_SET_CLASS_O_N, 292 }; 293 294 /** 295 * struct nft_set_estimate - estimation of memory and performance 296 * characteristics 297 * 298 * @size: required memory 299 * @lookup: lookup performance class 300 * @space: memory class 301 */ 302 struct nft_set_estimate { 303 u64 size; 304 enum nft_set_class lookup; 305 enum nft_set_class space; 306 }; 307 308 #define NFT_EXPR_MAXATTR 16 309 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 310 ALIGN(size, __alignof__(struct nft_expr))) 311 312 /** 313 * struct nft_expr - nf_tables expression 314 * 315 * @ops: expression ops 316 * @data: expression private data 317 */ 318 struct nft_expr { 319 const struct nft_expr_ops *ops; 320 unsigned char data[] 321 __attribute__((aligned(__alignof__(u64)))); 322 }; 323 324 static inline void *nft_expr_priv(const struct nft_expr *expr) 325 { 326 return (void *)expr->data; 327 } 328 329 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); 330 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 331 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 332 const struct nft_expr *expr); 333 334 struct nft_set_ext; 335 336 /** 337 * struct nft_set_ops - nf_tables set operations 338 * 339 * @lookup: look up an element within the set 340 * @update: update an element if exists, add it if doesn't exist 341 * @delete: delete an element 342 * @insert: insert new element into set 343 * @activate: activate new element in the next generation 344 * @deactivate: lookup for element and deactivate it in the next generation 345 * @flush: deactivate element in the next generation 346 * @remove: remove element from set 347 * @walk: iterate over all set elements 348 * @get: get set elements 349 * @privsize: function to return size of set private data 350 * @init: initialize private data of new set instance 351 * @destroy: destroy private data of set instance 352 * @elemsize: element private size 353 * 354 * Operations lookup, update and delete have simpler interfaces, are faster 355 * and currently only used in the packet path. All the rest are slower, 356 * control plane functions. 357 */ 358 struct nft_set_ops { 359 bool (*lookup)(const struct net *net, 360 const struct nft_set *set, 361 const u32 *key, 362 const struct nft_set_ext **ext); 363 bool (*update)(struct nft_set *set, 364 const u32 *key, 365 void *(*new)(struct nft_set *, 366 const struct nft_expr *, 367 struct nft_regs *), 368 const struct nft_expr *expr, 369 struct nft_regs *regs, 370 const struct nft_set_ext **ext); 371 bool (*delete)(const struct nft_set *set, 372 const u32 *key); 373 374 int (*insert)(const struct net *net, 375 const struct nft_set *set, 376 const struct nft_set_elem *elem, 377 struct nft_set_ext **ext); 378 void (*activate)(const struct net *net, 379 const struct nft_set *set, 380 const struct nft_set_elem *elem); 381 void * (*deactivate)(const struct net *net, 382 const struct nft_set *set, 383 const struct nft_set_elem *elem); 384 bool (*flush)(const struct net *net, 385 const struct nft_set *set, 386 void *priv); 387 void (*remove)(const struct net *net, 388 const struct nft_set *set, 389 const struct nft_set_elem *elem); 390 void (*walk)(const struct nft_ctx *ctx, 391 struct nft_set *set, 392 struct nft_set_iter *iter); 393 void * (*get)(const struct net *net, 394 const struct nft_set *set, 395 const struct nft_set_elem *elem, 396 unsigned int flags); 397 398 u64 (*privsize)(const struct nlattr * const nla[], 399 const struct nft_set_desc *desc); 400 bool (*estimate)(const struct nft_set_desc *desc, 401 u32 features, 402 struct nft_set_estimate *est); 403 int (*init)(const struct nft_set *set, 404 const struct nft_set_desc *desc, 405 const struct nlattr * const nla[]); 406 void (*destroy)(const struct nft_set *set); 407 void (*gc_init)(const struct nft_set *set); 408 409 unsigned int elemsize; 410 }; 411 412 /** 413 * struct nft_set_type - nf_tables set type 414 * 415 * @ops: set ops for this type 416 * @features: features supported by the implementation 417 */ 418 struct nft_set_type { 419 const struct nft_set_ops ops; 420 u32 features; 421 }; 422 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 423 424 struct nft_set_elem_expr { 425 u8 size; 426 unsigned char data[] 427 __attribute__((aligned(__alignof__(struct nft_expr)))); 428 }; 429 430 #define nft_setelem_expr_at(__elem_expr, __offset) \ 431 ((struct nft_expr *)&__elem_expr->data[__offset]) 432 433 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 434 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 435 __size < (__elem_expr)->size; \ 436 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 437 438 #define NFT_SET_EXPR_MAX 2 439 440 /** 441 * struct nft_set - nf_tables set instance 442 * 443 * @list: table set list node 444 * @bindings: list of set bindings 445 * @table: table this set belongs to 446 * @net: netnamespace this set belongs to 447 * @name: name of the set 448 * @handle: unique handle of the set 449 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 450 * @dtype: data type (verdict or numeric type defined by userspace) 451 * @objtype: object type (see NFT_OBJECT_* definitions) 452 * @size: maximum set size 453 * @field_len: length of each field in concatenation, bytes 454 * @field_count: number of concatenated fields in element 455 * @use: number of rules references to this set 456 * @nelems: number of elements 457 * @ndeact: number of deactivated elements queued for removal 458 * @timeout: default timeout value in jiffies 459 * @gc_int: garbage collection interval in msecs 460 * @policy: set parameterization (see enum nft_set_policies) 461 * @udlen: user data length 462 * @udata: user data 463 * @expr: stateful expression 464 * @ops: set ops 465 * @flags: set flags 466 * @genmask: generation mask 467 * @klen: key length 468 * @dlen: data length 469 * @data: private set data 470 */ 471 struct nft_set { 472 struct list_head list; 473 struct list_head bindings; 474 struct nft_table *table; 475 possible_net_t net; 476 char *name; 477 u64 handle; 478 u32 ktype; 479 u32 dtype; 480 u32 objtype; 481 u32 size; 482 u8 field_len[NFT_REG32_COUNT]; 483 u8 field_count; 484 u32 use; 485 atomic_t nelems; 486 u32 ndeact; 487 u64 timeout; 488 u32 gc_int; 489 u16 policy; 490 u16 udlen; 491 unsigned char *udata; 492 /* runtime data below here */ 493 const struct nft_set_ops *ops ____cacheline_aligned; 494 u16 flags:14, 495 genmask:2; 496 u8 klen; 497 u8 dlen; 498 u8 num_exprs; 499 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 500 unsigned char data[] 501 __attribute__((aligned(__alignof__(u64)))); 502 }; 503 504 static inline bool nft_set_is_anonymous(const struct nft_set *set) 505 { 506 return set->flags & NFT_SET_ANONYMOUS; 507 } 508 509 static inline void *nft_set_priv(const struct nft_set *set) 510 { 511 return (void *)set->data; 512 } 513 514 static inline struct nft_set *nft_set_container_of(const void *priv) 515 { 516 return (void *)priv - offsetof(struct nft_set, data); 517 } 518 519 struct nft_set *nft_set_lookup_global(const struct net *net, 520 const struct nft_table *table, 521 const struct nlattr *nla_set_name, 522 const struct nlattr *nla_set_id, 523 u8 genmask); 524 525 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 526 { 527 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; 528 } 529 530 /** 531 * struct nft_set_binding - nf_tables set binding 532 * 533 * @list: set bindings list node 534 * @chain: chain containing the rule bound to the set 535 * @flags: set action flags 536 * 537 * A set binding contains all information necessary for validation 538 * of new elements added to a bound set. 539 */ 540 struct nft_set_binding { 541 struct list_head list; 542 const struct nft_chain *chain; 543 u32 flags; 544 }; 545 546 enum nft_trans_phase; 547 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 548 struct nft_set_binding *binding, 549 enum nft_trans_phase phase); 550 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 551 struct nft_set_binding *binding); 552 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 553 554 /** 555 * enum nft_set_extensions - set extension type IDs 556 * 557 * @NFT_SET_EXT_KEY: element key 558 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 559 * @NFT_SET_EXT_DATA: mapping data 560 * @NFT_SET_EXT_FLAGS: element flags 561 * @NFT_SET_EXT_TIMEOUT: element timeout 562 * @NFT_SET_EXT_EXPIRATION: element expiration time 563 * @NFT_SET_EXT_USERDATA: user data associated with the element 564 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 565 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 566 * @NFT_SET_EXT_NUM: number of extension types 567 */ 568 enum nft_set_extensions { 569 NFT_SET_EXT_KEY, 570 NFT_SET_EXT_KEY_END, 571 NFT_SET_EXT_DATA, 572 NFT_SET_EXT_FLAGS, 573 NFT_SET_EXT_TIMEOUT, 574 NFT_SET_EXT_EXPIRATION, 575 NFT_SET_EXT_USERDATA, 576 NFT_SET_EXT_EXPRESSIONS, 577 NFT_SET_EXT_OBJREF, 578 NFT_SET_EXT_NUM 579 }; 580 581 /** 582 * struct nft_set_ext_type - set extension type 583 * 584 * @len: fixed part length of the extension 585 * @align: alignment requirements of the extension 586 */ 587 struct nft_set_ext_type { 588 u8 len; 589 u8 align; 590 }; 591 592 extern const struct nft_set_ext_type nft_set_ext_types[]; 593 594 /** 595 * struct nft_set_ext_tmpl - set extension template 596 * 597 * @len: length of extension area 598 * @offset: offsets of individual extension types 599 */ 600 struct nft_set_ext_tmpl { 601 u16 len; 602 u8 offset[NFT_SET_EXT_NUM]; 603 }; 604 605 /** 606 * struct nft_set_ext - set extensions 607 * 608 * @genmask: generation mask 609 * @offset: offsets of individual extension types 610 * @data: beginning of extension data 611 */ 612 struct nft_set_ext { 613 u8 genmask; 614 u8 offset[NFT_SET_EXT_NUM]; 615 char data[]; 616 }; 617 618 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 619 { 620 memset(tmpl, 0, sizeof(*tmpl)); 621 tmpl->len = sizeof(struct nft_set_ext); 622 } 623 624 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 625 unsigned int len) 626 { 627 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 628 BUG_ON(tmpl->len > U8_MAX); 629 tmpl->offset[id] = tmpl->len; 630 tmpl->len += nft_set_ext_types[id].len + len; 631 } 632 633 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 634 { 635 nft_set_ext_add_length(tmpl, id, 0); 636 } 637 638 static inline void nft_set_ext_init(struct nft_set_ext *ext, 639 const struct nft_set_ext_tmpl *tmpl) 640 { 641 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 642 } 643 644 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 645 { 646 return !!ext->offset[id]; 647 } 648 649 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 650 { 651 return ext && __nft_set_ext_exists(ext, id); 652 } 653 654 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 655 { 656 return (void *)ext + ext->offset[id]; 657 } 658 659 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 660 { 661 return nft_set_ext(ext, NFT_SET_EXT_KEY); 662 } 663 664 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 665 { 666 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 667 } 668 669 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 670 { 671 return nft_set_ext(ext, NFT_SET_EXT_DATA); 672 } 673 674 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 675 { 676 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 677 } 678 679 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 680 { 681 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 682 } 683 684 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 685 { 686 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 687 } 688 689 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 690 { 691 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 692 } 693 694 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 695 { 696 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 697 } 698 699 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 700 { 701 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 702 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 703 } 704 705 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 706 void *elem) 707 { 708 return elem + set->ops->elemsize; 709 } 710 711 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 712 { 713 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 714 } 715 716 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 717 const struct nft_set *set, 718 const struct nlattr *attr); 719 720 void *nft_set_elem_init(const struct nft_set *set, 721 const struct nft_set_ext_tmpl *tmpl, 722 const u32 *key, const u32 *key_end, const u32 *data, 723 u64 timeout, u64 expiration, gfp_t gfp); 724 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 725 struct nft_expr *expr_array[]); 726 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 727 bool destroy_expr); 728 729 /** 730 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch 731 * 732 * @rcu: rcu head 733 * @set: set the elements belong to 734 * @cnt: count of elements 735 */ 736 struct nft_set_gc_batch_head { 737 struct rcu_head rcu; 738 const struct nft_set *set; 739 unsigned int cnt; 740 }; 741 742 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ 743 sizeof(struct nft_set_gc_batch_head)) / \ 744 sizeof(void *)) 745 746 /** 747 * struct nft_set_gc_batch - nf_tables set garbage collection batch 748 * 749 * @head: GC batch head 750 * @elems: garbage collection elements 751 */ 752 struct nft_set_gc_batch { 753 struct nft_set_gc_batch_head head; 754 void *elems[NFT_SET_GC_BATCH_SIZE]; 755 }; 756 757 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 758 gfp_t gfp); 759 void nft_set_gc_batch_release(struct rcu_head *rcu); 760 761 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) 762 { 763 if (gcb != NULL) 764 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); 765 } 766 767 static inline struct nft_set_gc_batch * 768 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, 769 gfp_t gfp) 770 { 771 if (gcb != NULL) { 772 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) 773 return gcb; 774 nft_set_gc_batch_complete(gcb); 775 } 776 return nft_set_gc_batch_alloc(set, gfp); 777 } 778 779 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, 780 void *elem) 781 { 782 gcb->elems[gcb->head.cnt++] = elem; 783 } 784 785 struct nft_expr_ops; 786 /** 787 * struct nft_expr_type - nf_tables expression type 788 * 789 * @select_ops: function to select nft_expr_ops 790 * @release_ops: release nft_expr_ops 791 * @ops: default ops, used when no select_ops functions is present 792 * @list: used internally 793 * @name: Identifier 794 * @owner: module reference 795 * @policy: netlink attribute policy 796 * @maxattr: highest netlink attribute number 797 * @family: address family for AF-specific types 798 * @flags: expression type flags 799 */ 800 struct nft_expr_type { 801 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 802 const struct nlattr * const tb[]); 803 void (*release_ops)(const struct nft_expr_ops *ops); 804 const struct nft_expr_ops *ops; 805 struct list_head list; 806 const char *name; 807 struct module *owner; 808 const struct nla_policy *policy; 809 unsigned int maxattr; 810 u8 family; 811 u8 flags; 812 }; 813 814 #define NFT_EXPR_STATEFUL 0x1 815 #define NFT_EXPR_GC 0x2 816 817 enum nft_trans_phase { 818 NFT_TRANS_PREPARE, 819 NFT_TRANS_ABORT, 820 NFT_TRANS_COMMIT, 821 NFT_TRANS_RELEASE 822 }; 823 824 struct nft_flow_rule; 825 struct nft_offload_ctx; 826 827 /** 828 * struct nft_expr_ops - nf_tables expression operations 829 * 830 * @eval: Expression evaluation function 831 * @size: full expression size, including private data size 832 * @init: initialization function 833 * @activate: activate expression in the next generation 834 * @deactivate: deactivate expression in next generation 835 * @destroy: destruction function, called after synchronize_rcu 836 * @dump: function to dump parameters 837 * @type: expression type 838 * @validate: validate expression, called during loop detection 839 * @data: extra data to attach to this expression operation 840 */ 841 struct nft_expr_ops { 842 void (*eval)(const struct nft_expr *expr, 843 struct nft_regs *regs, 844 const struct nft_pktinfo *pkt); 845 int (*clone)(struct nft_expr *dst, 846 const struct nft_expr *src); 847 unsigned int size; 848 849 int (*init)(const struct nft_ctx *ctx, 850 const struct nft_expr *expr, 851 const struct nlattr * const tb[]); 852 void (*activate)(const struct nft_ctx *ctx, 853 const struct nft_expr *expr); 854 void (*deactivate)(const struct nft_ctx *ctx, 855 const struct nft_expr *expr, 856 enum nft_trans_phase phase); 857 void (*destroy)(const struct nft_ctx *ctx, 858 const struct nft_expr *expr); 859 void (*destroy_clone)(const struct nft_ctx *ctx, 860 const struct nft_expr *expr); 861 int (*dump)(struct sk_buff *skb, 862 const struct nft_expr *expr); 863 int (*validate)(const struct nft_ctx *ctx, 864 const struct nft_expr *expr, 865 const struct nft_data **data); 866 bool (*gc)(struct net *net, 867 const struct nft_expr *expr); 868 int (*offload)(struct nft_offload_ctx *ctx, 869 struct nft_flow_rule *flow, 870 const struct nft_expr *expr); 871 u32 offload_flags; 872 const struct nft_expr_type *type; 873 void *data; 874 }; 875 876 /** 877 * struct nft_rule - nf_tables rule 878 * 879 * @list: used internally 880 * @handle: rule handle 881 * @genmask: generation mask 882 * @dlen: length of expression data 883 * @udata: user data is appended to the rule 884 * @data: expression data 885 */ 886 struct nft_rule { 887 struct list_head list; 888 u64 handle:42, 889 genmask:2, 890 dlen:12, 891 udata:1; 892 unsigned char data[] 893 __attribute__((aligned(__alignof__(struct nft_expr)))); 894 }; 895 896 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 897 { 898 return (struct nft_expr *)&rule->data[0]; 899 } 900 901 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 902 { 903 return ((void *)expr) + expr->ops->size; 904 } 905 906 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 907 { 908 return (struct nft_expr *)&rule->data[rule->dlen]; 909 } 910 911 static inline bool nft_expr_more(const struct nft_rule *rule, 912 const struct nft_expr *expr) 913 { 914 return expr != nft_expr_last(rule) && expr->ops; 915 } 916 917 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 918 { 919 return (void *)&rule->data[rule->dlen]; 920 } 921 922 void nf_tables_rule_release(const struct nft_ctx *ctx, struct nft_rule *rule); 923 924 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 925 struct nft_regs *regs, 926 const struct nft_pktinfo *pkt) 927 { 928 struct nft_set_elem_expr *elem_expr; 929 struct nft_expr *expr; 930 u32 size; 931 932 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 933 elem_expr = nft_set_ext_expr(ext); 934 nft_setelem_expr_foreach(expr, elem_expr, size) { 935 expr->ops->eval(expr, regs, pkt); 936 if (regs->verdict.code == NFT_BREAK) 937 return; 938 } 939 } 940 } 941 942 /* 943 * The last pointer isn't really necessary, but the compiler isn't able to 944 * determine that the result of nft_expr_last() is always the same since it 945 * can't assume that the dlen value wasn't changed within calls in the loop. 946 */ 947 #define nft_rule_for_each_expr(expr, last, rule) \ 948 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 949 (expr) != (last); \ 950 (expr) = nft_expr_next(expr)) 951 952 #define NFT_CHAIN_POLICY_UNSET U8_MAX 953 954 /** 955 * struct nft_chain - nf_tables chain 956 * 957 * @rules: list of rules in the chain 958 * @list: used internally 959 * @rhlhead: used internally 960 * @table: table that this chain belongs to 961 * @handle: chain handle 962 * @use: number of jump references to this chain 963 * @flags: bitmask of enum nft_chain_flags 964 * @name: name of the chain 965 */ 966 struct nft_chain { 967 struct nft_rule *__rcu *rules_gen_0; 968 struct nft_rule *__rcu *rules_gen_1; 969 struct list_head rules; 970 struct list_head list; 971 struct rhlist_head rhlhead; 972 struct nft_table *table; 973 u64 handle; 974 u32 use; 975 u8 flags:5, 976 bound:1, 977 genmask:2; 978 char *name; 979 u16 udlen; 980 u8 *udata; 981 982 /* Only used during control plane commit phase: */ 983 struct nft_rule **rules_next; 984 }; 985 986 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 987 988 enum nft_chain_types { 989 NFT_CHAIN_T_DEFAULT = 0, 990 NFT_CHAIN_T_ROUTE, 991 NFT_CHAIN_T_NAT, 992 NFT_CHAIN_T_MAX 993 }; 994 995 /** 996 * struct nft_chain_type - nf_tables chain type info 997 * 998 * @name: name of the type 999 * @type: numeric identifier 1000 * @family: address family 1001 * @owner: module owner 1002 * @hook_mask: mask of valid hooks 1003 * @hooks: array of hook functions 1004 * @ops_register: base chain register function 1005 * @ops_unregister: base chain unregister function 1006 */ 1007 struct nft_chain_type { 1008 const char *name; 1009 enum nft_chain_types type; 1010 int family; 1011 struct module *owner; 1012 unsigned int hook_mask; 1013 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1014 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1015 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1016 }; 1017 1018 int nft_chain_validate_dependency(const struct nft_chain *chain, 1019 enum nft_chain_types type); 1020 int nft_chain_validate_hooks(const struct nft_chain *chain, 1021 unsigned int hook_flags); 1022 1023 static inline bool nft_chain_is_bound(struct nft_chain *chain) 1024 { 1025 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1026 } 1027 1028 void nft_chain_del(struct nft_chain *chain); 1029 void nf_tables_chain_destroy(struct nft_ctx *ctx); 1030 1031 struct nft_stats { 1032 u64 bytes; 1033 u64 pkts; 1034 struct u64_stats_sync syncp; 1035 }; 1036 1037 struct nft_hook { 1038 struct list_head list; 1039 bool inactive; 1040 struct nf_hook_ops ops; 1041 struct rcu_head rcu; 1042 }; 1043 1044 /** 1045 * struct nft_base_chain - nf_tables base chain 1046 * 1047 * @ops: netfilter hook ops 1048 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1049 * @type: chain type 1050 * @policy: default policy 1051 * @stats: per-cpu chain stats 1052 * @chain: the chain 1053 * @flow_block: flow block (for hardware offload) 1054 */ 1055 struct nft_base_chain { 1056 struct nf_hook_ops ops; 1057 struct list_head hook_list; 1058 const struct nft_chain_type *type; 1059 u8 policy; 1060 u8 flags; 1061 struct nft_stats __percpu *stats; 1062 struct nft_chain chain; 1063 struct flow_block flow_block; 1064 }; 1065 1066 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1067 { 1068 return container_of(chain, struct nft_base_chain, chain); 1069 } 1070 1071 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1072 { 1073 return chain->flags & NFT_CHAIN_BASE; 1074 } 1075 1076 int __nft_release_basechain(struct nft_ctx *ctx); 1077 1078 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1079 1080 /** 1081 * struct nft_table - nf_tables table 1082 * 1083 * @list: used internally 1084 * @chains_ht: chains in the table 1085 * @chains: same, for stable walks 1086 * @sets: sets in the table 1087 * @objects: stateful objects in the table 1088 * @flowtables: flow tables in the table 1089 * @hgenerator: handle generator state 1090 * @handle: table handle 1091 * @use: number of chain references to this table 1092 * @flags: table flag (see enum nft_table_flags) 1093 * @genmask: generation mask 1094 * @afinfo: address family info 1095 * @name: name of the table 1096 */ 1097 struct nft_table { 1098 struct list_head list; 1099 struct rhltable chains_ht; 1100 struct list_head chains; 1101 struct list_head sets; 1102 struct list_head objects; 1103 struct list_head flowtables; 1104 u64 hgenerator; 1105 u64 handle; 1106 u32 use; 1107 u16 family:6, 1108 flags:8, 1109 genmask:2; 1110 char *name; 1111 u16 udlen; 1112 u8 *udata; 1113 }; 1114 1115 static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1116 { 1117 return family == NFPROTO_NETDEV || 1118 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1119 } 1120 1121 void nft_register_chain_type(const struct nft_chain_type *); 1122 void nft_unregister_chain_type(const struct nft_chain_type *); 1123 1124 int nft_register_expr(struct nft_expr_type *); 1125 void nft_unregister_expr(struct nft_expr_type *); 1126 1127 int nft_verdict_dump(struct sk_buff *skb, int type, 1128 const struct nft_verdict *v); 1129 1130 /** 1131 * struct nft_object_hash_key - key to lookup nft_object 1132 * 1133 * @name: name of the stateful object to look up 1134 * @table: table the object belongs to 1135 */ 1136 struct nft_object_hash_key { 1137 const char *name; 1138 const struct nft_table *table; 1139 }; 1140 1141 /** 1142 * struct nft_object - nf_tables stateful object 1143 * 1144 * @list: table stateful object list node 1145 * @key: keys that identify this object 1146 * @rhlhead: nft_objname_ht node 1147 * @genmask: generation mask 1148 * @use: number of references to this stateful object 1149 * @handle: unique object handle 1150 * @ops: object operations 1151 * @data: object data, layout depends on type 1152 */ 1153 struct nft_object { 1154 struct list_head list; 1155 struct rhlist_head rhlhead; 1156 struct nft_object_hash_key key; 1157 u32 genmask:2, 1158 use:30; 1159 u64 handle; 1160 u16 udlen; 1161 u8 *udata; 1162 /* runtime data below here */ 1163 const struct nft_object_ops *ops ____cacheline_aligned; 1164 unsigned char data[] 1165 __attribute__((aligned(__alignof__(u64)))); 1166 }; 1167 1168 static inline void *nft_obj_data(const struct nft_object *obj) 1169 { 1170 return (void *)obj->data; 1171 } 1172 1173 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1174 1175 struct nft_object *nft_obj_lookup(const struct net *net, 1176 const struct nft_table *table, 1177 const struct nlattr *nla, u32 objtype, 1178 u8 genmask); 1179 1180 void nft_obj_notify(struct net *net, const struct nft_table *table, 1181 struct nft_object *obj, u32 portid, u32 seq, 1182 int event, int family, int report, gfp_t gfp); 1183 1184 /** 1185 * struct nft_object_type - stateful object type 1186 * 1187 * @select_ops: function to select nft_object_ops 1188 * @ops: default ops, used when no select_ops functions is present 1189 * @list: list node in list of object types 1190 * @type: stateful object numeric type 1191 * @owner: module owner 1192 * @maxattr: maximum netlink attribute 1193 * @policy: netlink attribute policy 1194 */ 1195 struct nft_object_type { 1196 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1197 const struct nlattr * const tb[]); 1198 const struct nft_object_ops *ops; 1199 struct list_head list; 1200 u32 type; 1201 unsigned int maxattr; 1202 struct module *owner; 1203 const struct nla_policy *policy; 1204 }; 1205 1206 /** 1207 * struct nft_object_ops - stateful object operations 1208 * 1209 * @eval: stateful object evaluation function 1210 * @size: stateful object size 1211 * @init: initialize object from netlink attributes 1212 * @destroy: release existing stateful object 1213 * @dump: netlink dump stateful object 1214 * @update: update stateful object 1215 */ 1216 struct nft_object_ops { 1217 void (*eval)(struct nft_object *obj, 1218 struct nft_regs *regs, 1219 const struct nft_pktinfo *pkt); 1220 unsigned int size; 1221 int (*init)(const struct nft_ctx *ctx, 1222 const struct nlattr *const tb[], 1223 struct nft_object *obj); 1224 void (*destroy)(const struct nft_ctx *ctx, 1225 struct nft_object *obj); 1226 int (*dump)(struct sk_buff *skb, 1227 struct nft_object *obj, 1228 bool reset); 1229 void (*update)(struct nft_object *obj, 1230 struct nft_object *newobj); 1231 const struct nft_object_type *type; 1232 }; 1233 1234 int nft_register_obj(struct nft_object_type *obj_type); 1235 void nft_unregister_obj(struct nft_object_type *obj_type); 1236 1237 #define NFT_NETDEVICE_MAX 256 1238 1239 /** 1240 * struct nft_flowtable - nf_tables flow table 1241 * 1242 * @list: flow table list node in table list 1243 * @table: the table the flow table is contained in 1244 * @name: name of this flow table 1245 * @hooknum: hook number 1246 * @ops_len: number of hooks in array 1247 * @genmask: generation mask 1248 * @use: number of references to this flow table 1249 * @handle: unique object handle 1250 * @dev_name: array of device names 1251 * @data: rhashtable and garbage collector 1252 * @ops: array of hooks 1253 */ 1254 struct nft_flowtable { 1255 struct list_head list; 1256 struct nft_table *table; 1257 char *name; 1258 int hooknum; 1259 int ops_len; 1260 u32 genmask:2, 1261 use:30; 1262 u64 handle; 1263 /* runtime data below here */ 1264 struct list_head hook_list ____cacheline_aligned; 1265 struct nf_flowtable data; 1266 }; 1267 1268 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1269 const struct nlattr *nla, 1270 u8 genmask); 1271 1272 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1273 struct nft_flowtable *flowtable, 1274 enum nft_trans_phase phase); 1275 1276 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1277 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1278 1279 /** 1280 * struct nft_traceinfo - nft tracing information and state 1281 * 1282 * @pkt: pktinfo currently processed 1283 * @basechain: base chain currently processed 1284 * @chain: chain currently processed 1285 * @rule: rule that was evaluated 1286 * @verdict: verdict given by rule 1287 * @type: event type (enum nft_trace_types) 1288 * @packet_dumped: packet headers sent in a previous traceinfo message 1289 * @trace: other struct members are initialised 1290 */ 1291 struct nft_traceinfo { 1292 const struct nft_pktinfo *pkt; 1293 const struct nft_base_chain *basechain; 1294 const struct nft_chain *chain; 1295 const struct nft_rule *rule; 1296 const struct nft_verdict *verdict; 1297 enum nft_trace_types type; 1298 bool packet_dumped; 1299 bool trace; 1300 }; 1301 1302 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1303 const struct nft_verdict *verdict, 1304 const struct nft_chain *basechain); 1305 1306 void nft_trace_notify(struct nft_traceinfo *info); 1307 1308 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1309 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1310 1311 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1312 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1313 1314 #define MODULE_ALIAS_NFT_EXPR(name) \ 1315 MODULE_ALIAS("nft-expr-" name) 1316 1317 #define MODULE_ALIAS_NFT_OBJ(type) \ 1318 MODULE_ALIAS("nft-obj-" __stringify(type)) 1319 1320 #if IS_ENABLED(CONFIG_NF_TABLES) 1321 1322 /* 1323 * The gencursor defines two generations, the currently active and the 1324 * next one. Objects contain a bitmask of 2 bits specifying the generations 1325 * they're active in. A set bit means they're inactive in the generation 1326 * represented by that bit. 1327 * 1328 * New objects start out as inactive in the current and active in the 1329 * next generation. When committing the ruleset the bitmask is cleared, 1330 * meaning they're active in all generations. When removing an object, 1331 * it is set inactive in the next generation. After committing the ruleset, 1332 * the objects are removed. 1333 */ 1334 static inline unsigned int nft_gencursor_next(const struct net *net) 1335 { 1336 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1337 } 1338 1339 static inline u8 nft_genmask_next(const struct net *net) 1340 { 1341 return 1 << nft_gencursor_next(net); 1342 } 1343 1344 static inline u8 nft_genmask_cur(const struct net *net) 1345 { 1346 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1347 return 1 << READ_ONCE(net->nft.gencursor); 1348 } 1349 1350 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1351 1352 /* 1353 * Generic transaction helpers 1354 */ 1355 1356 /* Check if this object is currently active. */ 1357 #define nft_is_active(__net, __obj) \ 1358 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1359 1360 /* Check if this object is active in the next generation. */ 1361 #define nft_is_active_next(__net, __obj) \ 1362 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1363 1364 /* This object becomes active in the next generation. */ 1365 #define nft_activate_next(__net, __obj) \ 1366 (__obj)->genmask = nft_genmask_cur(__net) 1367 1368 /* This object becomes inactive in the next generation. */ 1369 #define nft_deactivate_next(__net, __obj) \ 1370 (__obj)->genmask = nft_genmask_next(__net) 1371 1372 /* After committing the ruleset, clear the stale generation bit. */ 1373 #define nft_clear(__net, __obj) \ 1374 (__obj)->genmask &= ~nft_genmask_next(__net) 1375 #define nft_active_genmask(__obj, __genmask) \ 1376 !((__obj)->genmask & __genmask) 1377 1378 /* 1379 * Set element transaction helpers 1380 */ 1381 1382 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1383 u8 genmask) 1384 { 1385 return !(ext->genmask & genmask); 1386 } 1387 1388 static inline void nft_set_elem_change_active(const struct net *net, 1389 const struct nft_set *set, 1390 struct nft_set_ext *ext) 1391 { 1392 ext->genmask ^= nft_genmask_next(net); 1393 } 1394 1395 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1396 1397 /* 1398 * We use a free bit in the genmask field to indicate the element 1399 * is busy, meaning it is currently being processed either by 1400 * the netlink API or GC. 1401 * 1402 * Even though the genmask is only a single byte wide, this works 1403 * because the extension structure if fully constant once initialized, 1404 * so there are no non-atomic write accesses unless it is already 1405 * marked busy. 1406 */ 1407 #define NFT_SET_ELEM_BUSY_MASK (1 << 2) 1408 1409 #if defined(__LITTLE_ENDIAN_BITFIELD) 1410 #define NFT_SET_ELEM_BUSY_BIT 2 1411 #elif defined(__BIG_ENDIAN_BITFIELD) 1412 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1413 #else 1414 #error 1415 #endif 1416 1417 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) 1418 { 1419 unsigned long *word = (unsigned long *)ext; 1420 1421 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1422 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); 1423 } 1424 1425 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) 1426 { 1427 unsigned long *word = (unsigned long *)ext; 1428 1429 clear_bit(NFT_SET_ELEM_BUSY_BIT, word); 1430 } 1431 1432 /** 1433 * struct nft_trans - nf_tables object update in transaction 1434 * 1435 * @list: used internally 1436 * @msg_type: message type 1437 * @put_net: ctx->net needs to be put 1438 * @ctx: transaction context 1439 * @data: internal information related to the transaction 1440 */ 1441 struct nft_trans { 1442 struct list_head list; 1443 int msg_type; 1444 bool put_net; 1445 struct nft_ctx ctx; 1446 char data[]; 1447 }; 1448 1449 struct nft_trans_rule { 1450 struct nft_rule *rule; 1451 struct nft_flow_rule *flow; 1452 u32 rule_id; 1453 }; 1454 1455 #define nft_trans_rule(trans) \ 1456 (((struct nft_trans_rule *)trans->data)->rule) 1457 #define nft_trans_flow_rule(trans) \ 1458 (((struct nft_trans_rule *)trans->data)->flow) 1459 #define nft_trans_rule_id(trans) \ 1460 (((struct nft_trans_rule *)trans->data)->rule_id) 1461 1462 struct nft_trans_set { 1463 struct nft_set *set; 1464 u32 set_id; 1465 bool bound; 1466 }; 1467 1468 #define nft_trans_set(trans) \ 1469 (((struct nft_trans_set *)trans->data)->set) 1470 #define nft_trans_set_id(trans) \ 1471 (((struct nft_trans_set *)trans->data)->set_id) 1472 #define nft_trans_set_bound(trans) \ 1473 (((struct nft_trans_set *)trans->data)->bound) 1474 1475 struct nft_trans_chain { 1476 bool update; 1477 char *name; 1478 struct nft_stats __percpu *stats; 1479 u8 policy; 1480 u32 chain_id; 1481 }; 1482 1483 #define nft_trans_chain_update(trans) \ 1484 (((struct nft_trans_chain *)trans->data)->update) 1485 #define nft_trans_chain_name(trans) \ 1486 (((struct nft_trans_chain *)trans->data)->name) 1487 #define nft_trans_chain_stats(trans) \ 1488 (((struct nft_trans_chain *)trans->data)->stats) 1489 #define nft_trans_chain_policy(trans) \ 1490 (((struct nft_trans_chain *)trans->data)->policy) 1491 #define nft_trans_chain_id(trans) \ 1492 (((struct nft_trans_chain *)trans->data)->chain_id) 1493 1494 struct nft_trans_table { 1495 bool update; 1496 bool enable; 1497 }; 1498 1499 #define nft_trans_table_update(trans) \ 1500 (((struct nft_trans_table *)trans->data)->update) 1501 #define nft_trans_table_enable(trans) \ 1502 (((struct nft_trans_table *)trans->data)->enable) 1503 1504 struct nft_trans_elem { 1505 struct nft_set *set; 1506 struct nft_set_elem elem; 1507 bool bound; 1508 }; 1509 1510 #define nft_trans_elem_set(trans) \ 1511 (((struct nft_trans_elem *)trans->data)->set) 1512 #define nft_trans_elem(trans) \ 1513 (((struct nft_trans_elem *)trans->data)->elem) 1514 #define nft_trans_elem_set_bound(trans) \ 1515 (((struct nft_trans_elem *)trans->data)->bound) 1516 1517 struct nft_trans_obj { 1518 struct nft_object *obj; 1519 struct nft_object *newobj; 1520 bool update; 1521 }; 1522 1523 #define nft_trans_obj(trans) \ 1524 (((struct nft_trans_obj *)trans->data)->obj) 1525 #define nft_trans_obj_newobj(trans) \ 1526 (((struct nft_trans_obj *)trans->data)->newobj) 1527 #define nft_trans_obj_update(trans) \ 1528 (((struct nft_trans_obj *)trans->data)->update) 1529 1530 struct nft_trans_flowtable { 1531 struct nft_flowtable *flowtable; 1532 bool update; 1533 struct list_head hook_list; 1534 }; 1535 1536 #define nft_trans_flowtable(trans) \ 1537 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1538 #define nft_trans_flowtable_update(trans) \ 1539 (((struct nft_trans_flowtable *)trans->data)->update) 1540 #define nft_trans_flowtable_hooks(trans) \ 1541 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1542 1543 int __init nft_chain_filter_init(void); 1544 void nft_chain_filter_fini(void); 1545 1546 void __init nft_chain_route_init(void); 1547 void nft_chain_route_fini(void); 1548 1549 void nf_tables_trans_destroy_flush_work(void); 1550 1551 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1552 __be64 nf_jiffies64_to_msecs(u64 input); 1553 1554 #endif /* _NET_NF_TABLES_H */ 1555