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 struct module; 18 19 #define NFT_JUMP_STACK_SIZE 16 20 21 struct nft_pktinfo { 22 struct sk_buff *skb; 23 bool tprot_set; 24 u8 tprot; 25 /* for x_tables compatibility */ 26 struct xt_action_param xt; 27 }; 28 29 static inline struct net *nft_net(const struct nft_pktinfo *pkt) 30 { 31 return pkt->xt.state->net; 32 } 33 34 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) 35 { 36 return pkt->xt.state->hook; 37 } 38 39 static inline u8 nft_pf(const struct nft_pktinfo *pkt) 40 { 41 return pkt->xt.state->pf; 42 } 43 44 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) 45 { 46 return pkt->xt.state->in; 47 } 48 49 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) 50 { 51 return pkt->xt.state->out; 52 } 53 54 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, 55 struct sk_buff *skb, 56 const struct nf_hook_state *state) 57 { 58 pkt->skb = skb; 59 pkt->xt.state = state; 60 } 61 62 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt, 63 struct sk_buff *skb) 64 { 65 pkt->tprot_set = false; 66 pkt->tprot = 0; 67 pkt->xt.thoff = 0; 68 pkt->xt.fragoff = 0; 69 } 70 71 /** 72 * struct nft_verdict - nf_tables verdict 73 * 74 * @code: nf_tables/netfilter verdict code 75 * @chain: destination chain for NFT_JUMP/NFT_GOTO 76 */ 77 struct nft_verdict { 78 u32 code; 79 struct nft_chain *chain; 80 }; 81 82 struct nft_data { 83 union { 84 u32 data[4]; 85 struct nft_verdict verdict; 86 }; 87 } __attribute__((aligned(__alignof__(u64)))); 88 89 /** 90 * struct nft_regs - nf_tables register set 91 * 92 * @data: data registers 93 * @verdict: verdict register 94 * 95 * The first four data registers alias to the verdict register. 96 */ 97 struct nft_regs { 98 union { 99 u32 data[20]; 100 struct nft_verdict verdict; 101 }; 102 }; 103 104 /* Store/load an u8, u16 or u64 integer to/from the u32 data register. 105 * 106 * Note, when using concatenations, register allocation happens at 32-bit 107 * level. So for store instruction, pad the rest part with zero to avoid 108 * garbage values. 109 */ 110 111 static inline void nft_reg_store8(u32 *dreg, u8 val) 112 { 113 *dreg = 0; 114 *(u8 *)dreg = val; 115 } 116 117 static inline u8 nft_reg_load8(const u32 *sreg) 118 { 119 return *(u8 *)sreg; 120 } 121 122 static inline void nft_reg_store16(u32 *dreg, u16 val) 123 { 124 *dreg = 0; 125 *(u16 *)dreg = val; 126 } 127 128 static inline u16 nft_reg_load16(const u32 *sreg) 129 { 130 return *(u16 *)sreg; 131 } 132 133 static inline void nft_reg_store64(u32 *dreg, u64 val) 134 { 135 put_unaligned(val, (u64 *)dreg); 136 } 137 138 static inline u64 nft_reg_load64(const u32 *sreg) 139 { 140 return get_unaligned((u64 *)sreg); 141 } 142 143 static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 144 unsigned int len) 145 { 146 memcpy(dst, src, len); 147 } 148 149 static inline void nft_data_debug(const struct nft_data *data) 150 { 151 pr_debug("data[0]=%x data[1]=%x data[2]=%x data[3]=%x\n", 152 data->data[0], data->data[1], 153 data->data[2], data->data[3]); 154 } 155 156 /** 157 * struct nft_ctx - nf_tables rule/set context 158 * 159 * @net: net namespace 160 * @table: the table the chain is contained in 161 * @chain: the chain the rule is contained in 162 * @nla: netlink attributes 163 * @portid: netlink portID of the original message 164 * @seq: netlink sequence number 165 * @family: protocol family 166 * @level: depth of the chains 167 * @report: notify via unicast netlink message 168 */ 169 struct nft_ctx { 170 struct net *net; 171 struct nft_table *table; 172 struct nft_chain *chain; 173 const struct nlattr * const *nla; 174 u32 portid; 175 u32 seq; 176 u16 flags; 177 u8 family; 178 u8 level; 179 bool report; 180 }; 181 182 struct nft_data_desc { 183 enum nft_data_types type; 184 unsigned int len; 185 }; 186 187 int nft_data_init(const struct nft_ctx *ctx, 188 struct nft_data *data, unsigned int size, 189 struct nft_data_desc *desc, const struct nlattr *nla); 190 void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 191 void nft_data_release(const struct nft_data *data, enum nft_data_types type); 192 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 193 enum nft_data_types type, unsigned int len); 194 195 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 196 { 197 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 198 } 199 200 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 201 { 202 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 203 } 204 205 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 206 unsigned int nft_parse_register(const struct nlattr *attr); 207 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 208 209 int nft_validate_register_load(enum nft_registers reg, unsigned int len); 210 int nft_validate_register_store(const struct nft_ctx *ctx, 211 enum nft_registers reg, 212 const struct nft_data *data, 213 enum nft_data_types type, unsigned int len); 214 215 /** 216 * struct nft_userdata - user defined data associated with an object 217 * 218 * @len: length of the data 219 * @data: content 220 * 221 * The presence of user data is indicated in an object specific fashion, 222 * so a length of zero can't occur and the value "len" indicates data 223 * of length len + 1. 224 */ 225 struct nft_userdata { 226 u8 len; 227 unsigned char data[0]; 228 }; 229 230 /** 231 * struct nft_set_elem - generic representation of set elements 232 * 233 * @key: element key 234 * @priv: element private data and extensions 235 */ 236 struct nft_set_elem { 237 union { 238 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 239 struct nft_data val; 240 } key; 241 void *priv; 242 }; 243 244 struct nft_set; 245 struct nft_set_iter { 246 u8 genmask; 247 unsigned int count; 248 unsigned int skip; 249 int err; 250 int (*fn)(const struct nft_ctx *ctx, 251 struct nft_set *set, 252 const struct nft_set_iter *iter, 253 struct nft_set_elem *elem); 254 }; 255 256 /** 257 * struct nft_set_desc - description of set elements 258 * 259 * @klen: key length 260 * @dlen: data length 261 * @size: number of set elements 262 */ 263 struct nft_set_desc { 264 unsigned int klen; 265 unsigned int dlen; 266 unsigned int size; 267 }; 268 269 /** 270 * enum nft_set_class - performance class 271 * 272 * @NFT_LOOKUP_O_1: constant, O(1) 273 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) 274 * @NFT_LOOKUP_O_N: linear, O(N) 275 */ 276 enum nft_set_class { 277 NFT_SET_CLASS_O_1, 278 NFT_SET_CLASS_O_LOG_N, 279 NFT_SET_CLASS_O_N, 280 }; 281 282 /** 283 * struct nft_set_estimate - estimation of memory and performance 284 * characteristics 285 * 286 * @size: required memory 287 * @lookup: lookup performance class 288 * @space: memory class 289 */ 290 struct nft_set_estimate { 291 u64 size; 292 enum nft_set_class lookup; 293 enum nft_set_class space; 294 }; 295 296 struct nft_set_ext; 297 struct nft_expr; 298 299 /** 300 * struct nft_set_ops - nf_tables set operations 301 * 302 * @lookup: look up an element within the set 303 * @update: update an element if exists, add it if doesn't exist 304 * @delete: delete an element 305 * @insert: insert new element into set 306 * @activate: activate new element in the next generation 307 * @deactivate: lookup for element and deactivate it in the next generation 308 * @flush: deactivate element in the next generation 309 * @remove: remove element from set 310 * @walk: iterate over all set elements 311 * @get: get set elements 312 * @privsize: function to return size of set private data 313 * @init: initialize private data of new set instance 314 * @destroy: destroy private data of set instance 315 * @elemsize: element private size 316 * 317 * Operations lookup, update and delete have simpler interfaces, are faster 318 * and currently only used in the packet path. All the rest are slower, 319 * control plane functions. 320 */ 321 struct nft_set_ops { 322 bool (*lookup)(const struct net *net, 323 const struct nft_set *set, 324 const u32 *key, 325 const struct nft_set_ext **ext); 326 bool (*update)(struct nft_set *set, 327 const u32 *key, 328 void *(*new)(struct nft_set *, 329 const struct nft_expr *, 330 struct nft_regs *), 331 const struct nft_expr *expr, 332 struct nft_regs *regs, 333 const struct nft_set_ext **ext); 334 bool (*delete)(const struct nft_set *set, 335 const u32 *key); 336 337 int (*insert)(const struct net *net, 338 const struct nft_set *set, 339 const struct nft_set_elem *elem, 340 struct nft_set_ext **ext); 341 void (*activate)(const struct net *net, 342 const struct nft_set *set, 343 const struct nft_set_elem *elem); 344 void * (*deactivate)(const struct net *net, 345 const struct nft_set *set, 346 const struct nft_set_elem *elem); 347 bool (*flush)(const struct net *net, 348 const struct nft_set *set, 349 void *priv); 350 void (*remove)(const struct net *net, 351 const struct nft_set *set, 352 const struct nft_set_elem *elem); 353 void (*walk)(const struct nft_ctx *ctx, 354 struct nft_set *set, 355 struct nft_set_iter *iter); 356 void * (*get)(const struct net *net, 357 const struct nft_set *set, 358 const struct nft_set_elem *elem, 359 unsigned int flags); 360 361 u64 (*privsize)(const struct nlattr * const nla[], 362 const struct nft_set_desc *desc); 363 bool (*estimate)(const struct nft_set_desc *desc, 364 u32 features, 365 struct nft_set_estimate *est); 366 int (*init)(const struct nft_set *set, 367 const struct nft_set_desc *desc, 368 const struct nlattr * const nla[]); 369 void (*destroy)(const struct nft_set *set); 370 void (*gc_init)(const struct nft_set *set); 371 372 unsigned int elemsize; 373 }; 374 375 /** 376 * struct nft_set_type - nf_tables set type 377 * 378 * @ops: set ops for this type 379 * @list: used internally 380 * @owner: module reference 381 * @features: features supported by the implementation 382 */ 383 struct nft_set_type { 384 const struct nft_set_ops ops; 385 struct list_head list; 386 struct module *owner; 387 u32 features; 388 }; 389 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 390 391 int nft_register_set(struct nft_set_type *type); 392 void nft_unregister_set(struct nft_set_type *type); 393 394 /** 395 * struct nft_set - nf_tables set instance 396 * 397 * @list: table set list node 398 * @bindings: list of set bindings 399 * @table: table this set belongs to 400 * @net: netnamespace this set belongs to 401 * @name: name of the set 402 * @handle: unique handle of the set 403 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 404 * @dtype: data type (verdict or numeric type defined by userspace) 405 * @objtype: object type (see NFT_OBJECT_* definitions) 406 * @size: maximum set size 407 * @use: number of rules references to this set 408 * @nelems: number of elements 409 * @ndeact: number of deactivated elements queued for removal 410 * @timeout: default timeout value in jiffies 411 * @gc_int: garbage collection interval in msecs 412 * @policy: set parameterization (see enum nft_set_policies) 413 * @udlen: user data length 414 * @udata: user data 415 * @ops: set ops 416 * @flags: set flags 417 * @genmask: generation mask 418 * @klen: key length 419 * @dlen: data length 420 * @data: private set data 421 */ 422 struct nft_set { 423 struct list_head list; 424 struct list_head bindings; 425 struct nft_table *table; 426 possible_net_t net; 427 char *name; 428 u64 handle; 429 u32 ktype; 430 u32 dtype; 431 u32 objtype; 432 u32 size; 433 u32 use; 434 atomic_t nelems; 435 u32 ndeact; 436 u64 timeout; 437 u32 gc_int; 438 u16 policy; 439 u16 udlen; 440 unsigned char *udata; 441 /* runtime data below here */ 442 const struct nft_set_ops *ops ____cacheline_aligned; 443 u16 flags:14, 444 genmask:2; 445 u8 klen; 446 u8 dlen; 447 unsigned char data[] 448 __attribute__((aligned(__alignof__(u64)))); 449 }; 450 451 static inline bool nft_set_is_anonymous(const struct nft_set *set) 452 { 453 return set->flags & NFT_SET_ANONYMOUS; 454 } 455 456 static inline void *nft_set_priv(const struct nft_set *set) 457 { 458 return (void *)set->data; 459 } 460 461 static inline struct nft_set *nft_set_container_of(const void *priv) 462 { 463 return (void *)priv - offsetof(struct nft_set, data); 464 } 465 466 struct nft_set *nft_set_lookup_global(const struct net *net, 467 const struct nft_table *table, 468 const struct nlattr *nla_set_name, 469 const struct nlattr *nla_set_id, 470 u8 genmask); 471 472 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 473 { 474 return set->gc_int ? msecs_to_jiffies(set->gc_int) : HZ; 475 } 476 477 /** 478 * struct nft_set_binding - nf_tables set binding 479 * 480 * @list: set bindings list node 481 * @chain: chain containing the rule bound to the set 482 * @flags: set action flags 483 * 484 * A set binding contains all information necessary for validation 485 * of new elements added to a bound set. 486 */ 487 struct nft_set_binding { 488 struct list_head list; 489 const struct nft_chain *chain; 490 u32 flags; 491 }; 492 493 enum nft_trans_phase; 494 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 495 struct nft_set_binding *binding, 496 enum nft_trans_phase phase); 497 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 498 struct nft_set_binding *binding); 499 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 500 501 /** 502 * enum nft_set_extensions - set extension type IDs 503 * 504 * @NFT_SET_EXT_KEY: element key 505 * @NFT_SET_EXT_DATA: mapping data 506 * @NFT_SET_EXT_FLAGS: element flags 507 * @NFT_SET_EXT_TIMEOUT: element timeout 508 * @NFT_SET_EXT_EXPIRATION: element expiration time 509 * @NFT_SET_EXT_USERDATA: user data associated with the element 510 * @NFT_SET_EXT_EXPR: expression assiociated with the element 511 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 512 * @NFT_SET_EXT_NUM: number of extension types 513 */ 514 enum nft_set_extensions { 515 NFT_SET_EXT_KEY, 516 NFT_SET_EXT_DATA, 517 NFT_SET_EXT_FLAGS, 518 NFT_SET_EXT_TIMEOUT, 519 NFT_SET_EXT_EXPIRATION, 520 NFT_SET_EXT_USERDATA, 521 NFT_SET_EXT_EXPR, 522 NFT_SET_EXT_OBJREF, 523 NFT_SET_EXT_NUM 524 }; 525 526 /** 527 * struct nft_set_ext_type - set extension type 528 * 529 * @len: fixed part length of the extension 530 * @align: alignment requirements of the extension 531 */ 532 struct nft_set_ext_type { 533 u8 len; 534 u8 align; 535 }; 536 537 extern const struct nft_set_ext_type nft_set_ext_types[]; 538 539 /** 540 * struct nft_set_ext_tmpl - set extension template 541 * 542 * @len: length of extension area 543 * @offset: offsets of individual extension types 544 */ 545 struct nft_set_ext_tmpl { 546 u16 len; 547 u8 offset[NFT_SET_EXT_NUM]; 548 }; 549 550 /** 551 * struct nft_set_ext - set extensions 552 * 553 * @genmask: generation mask 554 * @offset: offsets of individual extension types 555 * @data: beginning of extension data 556 */ 557 struct nft_set_ext { 558 u8 genmask; 559 u8 offset[NFT_SET_EXT_NUM]; 560 char data[0]; 561 }; 562 563 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 564 { 565 memset(tmpl, 0, sizeof(*tmpl)); 566 tmpl->len = sizeof(struct nft_set_ext); 567 } 568 569 static inline void nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 570 unsigned int len) 571 { 572 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 573 BUG_ON(tmpl->len > U8_MAX); 574 tmpl->offset[id] = tmpl->len; 575 tmpl->len += nft_set_ext_types[id].len + len; 576 } 577 578 static inline void nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 579 { 580 nft_set_ext_add_length(tmpl, id, 0); 581 } 582 583 static inline void nft_set_ext_init(struct nft_set_ext *ext, 584 const struct nft_set_ext_tmpl *tmpl) 585 { 586 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 587 } 588 589 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 590 { 591 return !!ext->offset[id]; 592 } 593 594 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 595 { 596 return ext && __nft_set_ext_exists(ext, id); 597 } 598 599 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 600 { 601 return (void *)ext + ext->offset[id]; 602 } 603 604 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 605 { 606 return nft_set_ext(ext, NFT_SET_EXT_KEY); 607 } 608 609 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 610 { 611 return nft_set_ext(ext, NFT_SET_EXT_DATA); 612 } 613 614 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 615 { 616 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 617 } 618 619 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 620 { 621 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 622 } 623 624 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 625 { 626 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 627 } 628 629 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 630 { 631 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 632 } 633 634 static inline struct nft_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 635 { 636 return nft_set_ext(ext, NFT_SET_EXT_EXPR); 637 } 638 639 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 640 { 641 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 642 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 643 } 644 645 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 646 void *elem) 647 { 648 return elem + set->ops->elemsize; 649 } 650 651 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 652 { 653 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 654 } 655 656 void *nft_set_elem_init(const struct nft_set *set, 657 const struct nft_set_ext_tmpl *tmpl, 658 const u32 *key, const u32 *data, 659 u64 timeout, u64 expiration, gfp_t gfp); 660 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 661 bool destroy_expr); 662 663 /** 664 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch 665 * 666 * @rcu: rcu head 667 * @set: set the elements belong to 668 * @cnt: count of elements 669 */ 670 struct nft_set_gc_batch_head { 671 struct rcu_head rcu; 672 const struct nft_set *set; 673 unsigned int cnt; 674 }; 675 676 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ 677 sizeof(struct nft_set_gc_batch_head)) / \ 678 sizeof(void *)) 679 680 /** 681 * struct nft_set_gc_batch - nf_tables set garbage collection batch 682 * 683 * @head: GC batch head 684 * @elems: garbage collection elements 685 */ 686 struct nft_set_gc_batch { 687 struct nft_set_gc_batch_head head; 688 void *elems[NFT_SET_GC_BATCH_SIZE]; 689 }; 690 691 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 692 gfp_t gfp); 693 void nft_set_gc_batch_release(struct rcu_head *rcu); 694 695 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) 696 { 697 if (gcb != NULL) 698 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); 699 } 700 701 static inline struct nft_set_gc_batch * 702 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, 703 gfp_t gfp) 704 { 705 if (gcb != NULL) { 706 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) 707 return gcb; 708 nft_set_gc_batch_complete(gcb); 709 } 710 return nft_set_gc_batch_alloc(set, gfp); 711 } 712 713 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, 714 void *elem) 715 { 716 gcb->elems[gcb->head.cnt++] = elem; 717 } 718 719 struct nft_expr_ops; 720 /** 721 * struct nft_expr_type - nf_tables expression type 722 * 723 * @select_ops: function to select nft_expr_ops 724 * @release_ops: release nft_expr_ops 725 * @ops: default ops, used when no select_ops functions is present 726 * @list: used internally 727 * @name: Identifier 728 * @owner: module reference 729 * @policy: netlink attribute policy 730 * @maxattr: highest netlink attribute number 731 * @family: address family for AF-specific types 732 * @flags: expression type flags 733 */ 734 struct nft_expr_type { 735 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 736 const struct nlattr * const tb[]); 737 void (*release_ops)(const struct nft_expr_ops *ops); 738 const struct nft_expr_ops *ops; 739 struct list_head list; 740 const char *name; 741 struct module *owner; 742 const struct nla_policy *policy; 743 unsigned int maxattr; 744 u8 family; 745 u8 flags; 746 }; 747 748 #define NFT_EXPR_STATEFUL 0x1 749 #define NFT_EXPR_GC 0x2 750 751 enum nft_trans_phase { 752 NFT_TRANS_PREPARE, 753 NFT_TRANS_ABORT, 754 NFT_TRANS_COMMIT, 755 NFT_TRANS_RELEASE 756 }; 757 758 struct nft_flow_rule; 759 struct nft_offload_ctx; 760 761 /** 762 * struct nft_expr_ops - nf_tables expression operations 763 * 764 * @eval: Expression evaluation function 765 * @size: full expression size, including private data size 766 * @init: initialization function 767 * @activate: activate expression in the next generation 768 * @deactivate: deactivate expression in next generation 769 * @destroy: destruction function, called after synchronize_rcu 770 * @dump: function to dump parameters 771 * @type: expression type 772 * @validate: validate expression, called during loop detection 773 * @data: extra data to attach to this expression operation 774 */ 775 struct nft_expr; 776 struct nft_expr_ops { 777 void (*eval)(const struct nft_expr *expr, 778 struct nft_regs *regs, 779 const struct nft_pktinfo *pkt); 780 int (*clone)(struct nft_expr *dst, 781 const struct nft_expr *src); 782 unsigned int size; 783 784 int (*init)(const struct nft_ctx *ctx, 785 const struct nft_expr *expr, 786 const struct nlattr * const tb[]); 787 void (*activate)(const struct nft_ctx *ctx, 788 const struct nft_expr *expr); 789 void (*deactivate)(const struct nft_ctx *ctx, 790 const struct nft_expr *expr, 791 enum nft_trans_phase phase); 792 void (*destroy)(const struct nft_ctx *ctx, 793 const struct nft_expr *expr); 794 void (*destroy_clone)(const struct nft_ctx *ctx, 795 const struct nft_expr *expr); 796 int (*dump)(struct sk_buff *skb, 797 const struct nft_expr *expr); 798 int (*validate)(const struct nft_ctx *ctx, 799 const struct nft_expr *expr, 800 const struct nft_data **data); 801 bool (*gc)(struct net *net, 802 const struct nft_expr *expr); 803 int (*offload)(struct nft_offload_ctx *ctx, 804 struct nft_flow_rule *flow, 805 const struct nft_expr *expr); 806 u32 offload_flags; 807 const struct nft_expr_type *type; 808 void *data; 809 }; 810 811 #define NFT_EXPR_MAXATTR 16 812 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 813 ALIGN(size, __alignof__(struct nft_expr))) 814 815 /** 816 * struct nft_expr - nf_tables expression 817 * 818 * @ops: expression ops 819 * @data: expression private data 820 */ 821 struct nft_expr { 822 const struct nft_expr_ops *ops; 823 unsigned char data[] 824 __attribute__((aligned(__alignof__(u64)))); 825 }; 826 827 static inline void *nft_expr_priv(const struct nft_expr *expr) 828 { 829 return (void *)expr->data; 830 } 831 832 struct nft_expr *nft_expr_init(const struct nft_ctx *ctx, 833 const struct nlattr *nla); 834 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 835 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 836 const struct nft_expr *expr); 837 838 /** 839 * struct nft_rule - nf_tables rule 840 * 841 * @list: used internally 842 * @handle: rule handle 843 * @genmask: generation mask 844 * @dlen: length of expression data 845 * @udata: user data is appended to the rule 846 * @data: expression data 847 */ 848 struct nft_rule { 849 struct list_head list; 850 u64 handle:42, 851 genmask:2, 852 dlen:12, 853 udata:1; 854 unsigned char data[] 855 __attribute__((aligned(__alignof__(struct nft_expr)))); 856 }; 857 858 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 859 { 860 return (struct nft_expr *)&rule->data[0]; 861 } 862 863 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 864 { 865 return ((void *)expr) + expr->ops->size; 866 } 867 868 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 869 { 870 return (struct nft_expr *)&rule->data[rule->dlen]; 871 } 872 873 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 874 { 875 return (void *)&rule->data[rule->dlen]; 876 } 877 878 /* 879 * The last pointer isn't really necessary, but the compiler isn't able to 880 * determine that the result of nft_expr_last() is always the same since it 881 * can't assume that the dlen value wasn't changed within calls in the loop. 882 */ 883 #define nft_rule_for_each_expr(expr, last, rule) \ 884 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 885 (expr) != (last); \ 886 (expr) = nft_expr_next(expr)) 887 888 enum nft_chain_flags { 889 NFT_BASE_CHAIN = 0x1, 890 NFT_CHAIN_HW_OFFLOAD = 0x2, 891 }; 892 893 #define NFT_CHAIN_POLICY_UNSET U8_MAX 894 895 /** 896 * struct nft_chain - nf_tables chain 897 * 898 * @rules: list of rules in the chain 899 * @list: used internally 900 * @rhlhead: used internally 901 * @table: table that this chain belongs to 902 * @handle: chain handle 903 * @use: number of jump references to this chain 904 * @flags: bitmask of enum nft_chain_flags 905 * @name: name of the chain 906 */ 907 struct nft_chain { 908 struct nft_rule *__rcu *rules_gen_0; 909 struct nft_rule *__rcu *rules_gen_1; 910 struct list_head rules; 911 struct list_head list; 912 struct rhlist_head rhlhead; 913 struct nft_table *table; 914 u64 handle; 915 u32 use; 916 u8 flags:6, 917 genmask:2; 918 char *name; 919 920 /* Only used during control plane commit phase: */ 921 struct nft_rule **rules_next; 922 }; 923 924 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 925 926 enum nft_chain_types { 927 NFT_CHAIN_T_DEFAULT = 0, 928 NFT_CHAIN_T_ROUTE, 929 NFT_CHAIN_T_NAT, 930 NFT_CHAIN_T_MAX 931 }; 932 933 /** 934 * struct nft_chain_type - nf_tables chain type info 935 * 936 * @name: name of the type 937 * @type: numeric identifier 938 * @family: address family 939 * @owner: module owner 940 * @hook_mask: mask of valid hooks 941 * @hooks: array of hook functions 942 * @ops_register: base chain register function 943 * @ops_unregister: base chain unregister function 944 */ 945 struct nft_chain_type { 946 const char *name; 947 enum nft_chain_types type; 948 int family; 949 struct module *owner; 950 unsigned int hook_mask; 951 nf_hookfn *hooks[NF_MAX_HOOKS]; 952 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 953 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 954 }; 955 956 int nft_chain_validate_dependency(const struct nft_chain *chain, 957 enum nft_chain_types type); 958 int nft_chain_validate_hooks(const struct nft_chain *chain, 959 unsigned int hook_flags); 960 961 struct nft_stats { 962 u64 bytes; 963 u64 pkts; 964 struct u64_stats_sync syncp; 965 }; 966 967 struct nft_hook { 968 struct list_head list; 969 struct nf_hook_ops ops; 970 struct rcu_head rcu; 971 }; 972 973 /** 974 * struct nft_base_chain - nf_tables base chain 975 * 976 * @ops: netfilter hook ops 977 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 978 * @type: chain type 979 * @policy: default policy 980 * @stats: per-cpu chain stats 981 * @chain: the chain 982 * @flow_block: flow block (for hardware offload) 983 */ 984 struct nft_base_chain { 985 struct nf_hook_ops ops; 986 struct list_head hook_list; 987 const struct nft_chain_type *type; 988 u8 policy; 989 u8 flags; 990 struct nft_stats __percpu *stats; 991 struct nft_chain chain; 992 struct flow_block flow_block; 993 }; 994 995 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 996 { 997 return container_of(chain, struct nft_base_chain, chain); 998 } 999 1000 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1001 { 1002 return chain->flags & NFT_BASE_CHAIN; 1003 } 1004 1005 int __nft_release_basechain(struct nft_ctx *ctx); 1006 1007 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1008 1009 /** 1010 * struct nft_table - nf_tables table 1011 * 1012 * @list: used internally 1013 * @chains_ht: chains in the table 1014 * @chains: same, for stable walks 1015 * @sets: sets in the table 1016 * @objects: stateful objects in the table 1017 * @flowtables: flow tables in the table 1018 * @hgenerator: handle generator state 1019 * @handle: table handle 1020 * @use: number of chain references to this table 1021 * @flags: table flag (see enum nft_table_flags) 1022 * @genmask: generation mask 1023 * @afinfo: address family info 1024 * @name: name of the table 1025 */ 1026 struct nft_table { 1027 struct list_head list; 1028 struct rhltable chains_ht; 1029 struct list_head chains; 1030 struct list_head sets; 1031 struct list_head objects; 1032 struct list_head flowtables; 1033 u64 hgenerator; 1034 u64 handle; 1035 u32 use; 1036 u16 family:6, 1037 flags:8, 1038 genmask:2; 1039 char *name; 1040 }; 1041 1042 void nft_register_chain_type(const struct nft_chain_type *); 1043 void nft_unregister_chain_type(const struct nft_chain_type *); 1044 1045 int nft_register_expr(struct nft_expr_type *); 1046 void nft_unregister_expr(struct nft_expr_type *); 1047 1048 int nft_verdict_dump(struct sk_buff *skb, int type, 1049 const struct nft_verdict *v); 1050 1051 /** 1052 * struct nft_object_hash_key - key to lookup nft_object 1053 * 1054 * @name: name of the stateful object to look up 1055 * @table: table the object belongs to 1056 */ 1057 struct nft_object_hash_key { 1058 const char *name; 1059 const struct nft_table *table; 1060 }; 1061 1062 /** 1063 * struct nft_object - nf_tables stateful object 1064 * 1065 * @list: table stateful object list node 1066 * @key: keys that identify this object 1067 * @rhlhead: nft_objname_ht node 1068 * @genmask: generation mask 1069 * @use: number of references to this stateful object 1070 * @handle: unique object handle 1071 * @ops: object operations 1072 * @data: object data, layout depends on type 1073 */ 1074 struct nft_object { 1075 struct list_head list; 1076 struct rhlist_head rhlhead; 1077 struct nft_object_hash_key key; 1078 u32 genmask:2, 1079 use:30; 1080 u64 handle; 1081 /* runtime data below here */ 1082 const struct nft_object_ops *ops ____cacheline_aligned; 1083 unsigned char data[] 1084 __attribute__((aligned(__alignof__(u64)))); 1085 }; 1086 1087 static inline void *nft_obj_data(const struct nft_object *obj) 1088 { 1089 return (void *)obj->data; 1090 } 1091 1092 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1093 1094 struct nft_object *nft_obj_lookup(const struct net *net, 1095 const struct nft_table *table, 1096 const struct nlattr *nla, u32 objtype, 1097 u8 genmask); 1098 1099 void nft_obj_notify(struct net *net, const struct nft_table *table, 1100 struct nft_object *obj, u32 portid, u32 seq, 1101 int event, int family, int report, gfp_t gfp); 1102 1103 /** 1104 * struct nft_object_type - stateful object type 1105 * 1106 * @select_ops: function to select nft_object_ops 1107 * @ops: default ops, used when no select_ops functions is present 1108 * @list: list node in list of object types 1109 * @type: stateful object numeric type 1110 * @owner: module owner 1111 * @maxattr: maximum netlink attribute 1112 * @policy: netlink attribute policy 1113 */ 1114 struct nft_object_type { 1115 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1116 const struct nlattr * const tb[]); 1117 const struct nft_object_ops *ops; 1118 struct list_head list; 1119 u32 type; 1120 unsigned int maxattr; 1121 struct module *owner; 1122 const struct nla_policy *policy; 1123 }; 1124 1125 /** 1126 * struct nft_object_ops - stateful object operations 1127 * 1128 * @eval: stateful object evaluation function 1129 * @size: stateful object size 1130 * @init: initialize object from netlink attributes 1131 * @destroy: release existing stateful object 1132 * @dump: netlink dump stateful object 1133 * @update: update stateful object 1134 */ 1135 struct nft_object_ops { 1136 void (*eval)(struct nft_object *obj, 1137 struct nft_regs *regs, 1138 const struct nft_pktinfo *pkt); 1139 unsigned int size; 1140 int (*init)(const struct nft_ctx *ctx, 1141 const struct nlattr *const tb[], 1142 struct nft_object *obj); 1143 void (*destroy)(const struct nft_ctx *ctx, 1144 struct nft_object *obj); 1145 int (*dump)(struct sk_buff *skb, 1146 struct nft_object *obj, 1147 bool reset); 1148 void (*update)(struct nft_object *obj, 1149 struct nft_object *newobj); 1150 const struct nft_object_type *type; 1151 }; 1152 1153 int nft_register_obj(struct nft_object_type *obj_type); 1154 void nft_unregister_obj(struct nft_object_type *obj_type); 1155 1156 #define NFT_NETDEVICE_MAX 256 1157 1158 /** 1159 * struct nft_flowtable - nf_tables flow table 1160 * 1161 * @list: flow table list node in table list 1162 * @table: the table the flow table is contained in 1163 * @name: name of this flow table 1164 * @hooknum: hook number 1165 * @ops_len: number of hooks in array 1166 * @genmask: generation mask 1167 * @use: number of references to this flow table 1168 * @handle: unique object handle 1169 * @dev_name: array of device names 1170 * @data: rhashtable and garbage collector 1171 * @ops: array of hooks 1172 */ 1173 struct nft_flowtable { 1174 struct list_head list; 1175 struct nft_table *table; 1176 char *name; 1177 int hooknum; 1178 int ops_len; 1179 u32 genmask:2, 1180 use:30; 1181 u64 handle; 1182 /* runtime data below here */ 1183 struct list_head hook_list ____cacheline_aligned; 1184 struct nf_flowtable data; 1185 }; 1186 1187 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1188 const struct nlattr *nla, 1189 u8 genmask); 1190 1191 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1192 struct nft_flowtable *flowtable, 1193 enum nft_trans_phase phase); 1194 1195 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1196 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1197 1198 /** 1199 * struct nft_traceinfo - nft tracing information and state 1200 * 1201 * @pkt: pktinfo currently processed 1202 * @basechain: base chain currently processed 1203 * @chain: chain currently processed 1204 * @rule: rule that was evaluated 1205 * @verdict: verdict given by rule 1206 * @type: event type (enum nft_trace_types) 1207 * @packet_dumped: packet headers sent in a previous traceinfo message 1208 * @trace: other struct members are initialised 1209 */ 1210 struct nft_traceinfo { 1211 const struct nft_pktinfo *pkt; 1212 const struct nft_base_chain *basechain; 1213 const struct nft_chain *chain; 1214 const struct nft_rule *rule; 1215 const struct nft_verdict *verdict; 1216 enum nft_trace_types type; 1217 bool packet_dumped; 1218 bool trace; 1219 }; 1220 1221 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1222 const struct nft_verdict *verdict, 1223 const struct nft_chain *basechain); 1224 1225 void nft_trace_notify(struct nft_traceinfo *info); 1226 1227 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1228 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1229 1230 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1231 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1232 1233 #define MODULE_ALIAS_NFT_EXPR(name) \ 1234 MODULE_ALIAS("nft-expr-" name) 1235 1236 #define MODULE_ALIAS_NFT_SET() \ 1237 MODULE_ALIAS("nft-set") 1238 1239 #define MODULE_ALIAS_NFT_OBJ(type) \ 1240 MODULE_ALIAS("nft-obj-" __stringify(type)) 1241 1242 #if IS_ENABLED(CONFIG_NF_TABLES) 1243 1244 /* 1245 * The gencursor defines two generations, the currently active and the 1246 * next one. Objects contain a bitmask of 2 bits specifying the generations 1247 * they're active in. A set bit means they're inactive in the generation 1248 * represented by that bit. 1249 * 1250 * New objects start out as inactive in the current and active in the 1251 * next generation. When committing the ruleset the bitmask is cleared, 1252 * meaning they're active in all generations. When removing an object, 1253 * it is set inactive in the next generation. After committing the ruleset, 1254 * the objects are removed. 1255 */ 1256 static inline unsigned int nft_gencursor_next(const struct net *net) 1257 { 1258 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1259 } 1260 1261 static inline u8 nft_genmask_next(const struct net *net) 1262 { 1263 return 1 << nft_gencursor_next(net); 1264 } 1265 1266 static inline u8 nft_genmask_cur(const struct net *net) 1267 { 1268 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1269 return 1 << READ_ONCE(net->nft.gencursor); 1270 } 1271 1272 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1273 1274 /* 1275 * Generic transaction helpers 1276 */ 1277 1278 /* Check if this object is currently active. */ 1279 #define nft_is_active(__net, __obj) \ 1280 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1281 1282 /* Check if this object is active in the next generation. */ 1283 #define nft_is_active_next(__net, __obj) \ 1284 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1285 1286 /* This object becomes active in the next generation. */ 1287 #define nft_activate_next(__net, __obj) \ 1288 (__obj)->genmask = nft_genmask_cur(__net) 1289 1290 /* This object becomes inactive in the next generation. */ 1291 #define nft_deactivate_next(__net, __obj) \ 1292 (__obj)->genmask = nft_genmask_next(__net) 1293 1294 /* After committing the ruleset, clear the stale generation bit. */ 1295 #define nft_clear(__net, __obj) \ 1296 (__obj)->genmask &= ~nft_genmask_next(__net) 1297 #define nft_active_genmask(__obj, __genmask) \ 1298 !((__obj)->genmask & __genmask) 1299 1300 /* 1301 * Set element transaction helpers 1302 */ 1303 1304 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1305 u8 genmask) 1306 { 1307 return !(ext->genmask & genmask); 1308 } 1309 1310 static inline void nft_set_elem_change_active(const struct net *net, 1311 const struct nft_set *set, 1312 struct nft_set_ext *ext) 1313 { 1314 ext->genmask ^= nft_genmask_next(net); 1315 } 1316 1317 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1318 1319 /* 1320 * We use a free bit in the genmask field to indicate the element 1321 * is busy, meaning it is currently being processed either by 1322 * the netlink API or GC. 1323 * 1324 * Even though the genmask is only a single byte wide, this works 1325 * because the extension structure if fully constant once initialized, 1326 * so there are no non-atomic write accesses unless it is already 1327 * marked busy. 1328 */ 1329 #define NFT_SET_ELEM_BUSY_MASK (1 << 2) 1330 1331 #if defined(__LITTLE_ENDIAN_BITFIELD) 1332 #define NFT_SET_ELEM_BUSY_BIT 2 1333 #elif defined(__BIG_ENDIAN_BITFIELD) 1334 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1335 #else 1336 #error 1337 #endif 1338 1339 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) 1340 { 1341 unsigned long *word = (unsigned long *)ext; 1342 1343 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1344 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); 1345 } 1346 1347 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) 1348 { 1349 unsigned long *word = (unsigned long *)ext; 1350 1351 clear_bit(NFT_SET_ELEM_BUSY_BIT, word); 1352 } 1353 1354 /** 1355 * struct nft_trans - nf_tables object update in transaction 1356 * 1357 * @list: used internally 1358 * @msg_type: message type 1359 * @put_net: ctx->net needs to be put 1360 * @ctx: transaction context 1361 * @data: internal information related to the transaction 1362 */ 1363 struct nft_trans { 1364 struct list_head list; 1365 int msg_type; 1366 bool put_net; 1367 struct nft_ctx ctx; 1368 char data[0]; 1369 }; 1370 1371 struct nft_trans_rule { 1372 struct nft_rule *rule; 1373 struct nft_flow_rule *flow; 1374 u32 rule_id; 1375 }; 1376 1377 #define nft_trans_rule(trans) \ 1378 (((struct nft_trans_rule *)trans->data)->rule) 1379 #define nft_trans_flow_rule(trans) \ 1380 (((struct nft_trans_rule *)trans->data)->flow) 1381 #define nft_trans_rule_id(trans) \ 1382 (((struct nft_trans_rule *)trans->data)->rule_id) 1383 1384 struct nft_trans_set { 1385 struct nft_set *set; 1386 u32 set_id; 1387 bool bound; 1388 }; 1389 1390 #define nft_trans_set(trans) \ 1391 (((struct nft_trans_set *)trans->data)->set) 1392 #define nft_trans_set_id(trans) \ 1393 (((struct nft_trans_set *)trans->data)->set_id) 1394 #define nft_trans_set_bound(trans) \ 1395 (((struct nft_trans_set *)trans->data)->bound) 1396 1397 struct nft_trans_chain { 1398 bool update; 1399 char *name; 1400 struct nft_stats __percpu *stats; 1401 u8 policy; 1402 }; 1403 1404 #define nft_trans_chain_update(trans) \ 1405 (((struct nft_trans_chain *)trans->data)->update) 1406 #define nft_trans_chain_name(trans) \ 1407 (((struct nft_trans_chain *)trans->data)->name) 1408 #define nft_trans_chain_stats(trans) \ 1409 (((struct nft_trans_chain *)trans->data)->stats) 1410 #define nft_trans_chain_policy(trans) \ 1411 (((struct nft_trans_chain *)trans->data)->policy) 1412 1413 struct nft_trans_table { 1414 bool update; 1415 bool enable; 1416 }; 1417 1418 #define nft_trans_table_update(trans) \ 1419 (((struct nft_trans_table *)trans->data)->update) 1420 #define nft_trans_table_enable(trans) \ 1421 (((struct nft_trans_table *)trans->data)->enable) 1422 1423 struct nft_trans_elem { 1424 struct nft_set *set; 1425 struct nft_set_elem elem; 1426 bool bound; 1427 }; 1428 1429 #define nft_trans_elem_set(trans) \ 1430 (((struct nft_trans_elem *)trans->data)->set) 1431 #define nft_trans_elem(trans) \ 1432 (((struct nft_trans_elem *)trans->data)->elem) 1433 #define nft_trans_elem_set_bound(trans) \ 1434 (((struct nft_trans_elem *)trans->data)->bound) 1435 1436 struct nft_trans_obj { 1437 struct nft_object *obj; 1438 struct nft_object *newobj; 1439 bool update; 1440 }; 1441 1442 #define nft_trans_obj(trans) \ 1443 (((struct nft_trans_obj *)trans->data)->obj) 1444 #define nft_trans_obj_newobj(trans) \ 1445 (((struct nft_trans_obj *)trans->data)->newobj) 1446 #define nft_trans_obj_update(trans) \ 1447 (((struct nft_trans_obj *)trans->data)->update) 1448 1449 struct nft_trans_flowtable { 1450 struct nft_flowtable *flowtable; 1451 }; 1452 1453 #define nft_trans_flowtable(trans) \ 1454 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1455 1456 int __init nft_chain_filter_init(void); 1457 void nft_chain_filter_fini(void); 1458 1459 void __init nft_chain_route_init(void); 1460 void nft_chain_route_fini(void); 1461 #endif /* _NET_NF_TABLES_H */ 1462