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 NFT_PKTINFO_INNER_FULL = (1 << 2), 28 }; 29 30 struct nft_pktinfo { 31 struct sk_buff *skb; 32 const struct nf_hook_state *state; 33 u8 flags; 34 u8 tprot; 35 u16 fragoff; 36 u16 thoff; 37 u16 inneroff; 38 }; 39 40 static inline struct sock *nft_sk(const struct nft_pktinfo *pkt) 41 { 42 return pkt->state->sk; 43 } 44 45 static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt) 46 { 47 return pkt->thoff; 48 } 49 50 static inline struct net *nft_net(const struct nft_pktinfo *pkt) 51 { 52 return pkt->state->net; 53 } 54 55 static inline unsigned int nft_hook(const struct nft_pktinfo *pkt) 56 { 57 return pkt->state->hook; 58 } 59 60 static inline u8 nft_pf(const struct nft_pktinfo *pkt) 61 { 62 return pkt->state->pf; 63 } 64 65 static inline const struct net_device *nft_in(const struct nft_pktinfo *pkt) 66 { 67 return pkt->state->in; 68 } 69 70 static inline const struct net_device *nft_out(const struct nft_pktinfo *pkt) 71 { 72 return pkt->state->out; 73 } 74 75 static inline void nft_set_pktinfo(struct nft_pktinfo *pkt, 76 struct sk_buff *skb, 77 const struct nf_hook_state *state) 78 { 79 pkt->skb = skb; 80 pkt->state = state; 81 } 82 83 static inline void nft_set_pktinfo_unspec(struct nft_pktinfo *pkt) 84 { 85 pkt->flags = 0; 86 pkt->tprot = 0; 87 pkt->thoff = 0; 88 pkt->fragoff = 0; 89 } 90 91 /** 92 * struct nft_verdict - nf_tables verdict 93 * 94 * @code: nf_tables/netfilter verdict code 95 * @chain: destination chain for NFT_JUMP/NFT_GOTO 96 */ 97 struct nft_verdict { 98 u32 code; 99 struct nft_chain *chain; 100 }; 101 102 struct nft_data { 103 union { 104 u32 data[4]; 105 struct nft_verdict verdict; 106 }; 107 } __attribute__((aligned(__alignof__(u64)))); 108 109 #define NFT_REG32_NUM 20 110 111 /** 112 * struct nft_regs - nf_tables register set 113 * 114 * @data: data registers 115 * @verdict: verdict register 116 * 117 * The first four data registers alias to the verdict register. 118 */ 119 struct nft_regs { 120 union { 121 u32 data[NFT_REG32_NUM]; 122 struct nft_verdict verdict; 123 }; 124 }; 125 126 struct nft_regs_track { 127 struct { 128 const struct nft_expr *selector; 129 const struct nft_expr *bitwise; 130 u8 num_reg; 131 } regs[NFT_REG32_NUM]; 132 133 const struct nft_expr *cur; 134 const struct nft_expr *last; 135 }; 136 137 /* Store/load an u8, u16 or u64 integer to/from the u32 data register. 138 * 139 * Note, when using concatenations, register allocation happens at 32-bit 140 * level. So for store instruction, pad the rest part with zero to avoid 141 * garbage values. 142 */ 143 144 static inline void nft_reg_store8(u32 *dreg, u8 val) 145 { 146 *dreg = 0; 147 *(u8 *)dreg = val; 148 } 149 150 static inline u8 nft_reg_load8(const u32 *sreg) 151 { 152 return *(u8 *)sreg; 153 } 154 155 static inline void nft_reg_store16(u32 *dreg, u16 val) 156 { 157 *dreg = 0; 158 *(u16 *)dreg = val; 159 } 160 161 static inline void nft_reg_store_be16(u32 *dreg, __be16 val) 162 { 163 nft_reg_store16(dreg, (__force __u16)val); 164 } 165 166 static inline u16 nft_reg_load16(const u32 *sreg) 167 { 168 return *(u16 *)sreg; 169 } 170 171 static inline __be16 nft_reg_load_be16(const u32 *sreg) 172 { 173 return (__force __be16)nft_reg_load16(sreg); 174 } 175 176 static inline __be32 nft_reg_load_be32(const u32 *sreg) 177 { 178 return *(__force __be32 *)sreg; 179 } 180 181 static inline void nft_reg_store64(u32 *dreg, u64 val) 182 { 183 put_unaligned(val, (u64 *)dreg); 184 } 185 186 static inline u64 nft_reg_load64(const u32 *sreg) 187 { 188 return get_unaligned((u64 *)sreg); 189 } 190 191 static inline void nft_data_copy(u32 *dst, const struct nft_data *src, 192 unsigned int len) 193 { 194 if (len % NFT_REG32_SIZE) 195 dst[len / NFT_REG32_SIZE] = 0; 196 memcpy(dst, src, len); 197 } 198 199 /** 200 * struct nft_ctx - nf_tables rule/set context 201 * 202 * @net: net namespace 203 * @table: the table the chain is contained in 204 * @chain: the chain the rule is contained in 205 * @nla: netlink attributes 206 * @portid: netlink portID of the original message 207 * @seq: netlink sequence number 208 * @family: protocol family 209 * @level: depth of the chains 210 * @report: notify via unicast netlink message 211 */ 212 struct nft_ctx { 213 struct net *net; 214 struct nft_table *table; 215 struct nft_chain *chain; 216 const struct nlattr * const *nla; 217 u32 portid; 218 u32 seq; 219 u16 flags; 220 u8 family; 221 u8 level; 222 bool report; 223 }; 224 225 enum nft_data_desc_flags { 226 NFT_DATA_DESC_SETELEM = (1 << 0), 227 }; 228 229 struct nft_data_desc { 230 enum nft_data_types type; 231 unsigned int size; 232 unsigned int len; 233 unsigned int flags; 234 }; 235 236 int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data, 237 struct nft_data_desc *desc, const struct nlattr *nla); 238 void nft_data_hold(const struct nft_data *data, enum nft_data_types type); 239 void nft_data_release(const struct nft_data *data, enum nft_data_types type); 240 int nft_data_dump(struct sk_buff *skb, int attr, const struct nft_data *data, 241 enum nft_data_types type, unsigned int len); 242 243 static inline enum nft_data_types nft_dreg_to_type(enum nft_registers reg) 244 { 245 return reg == NFT_REG_VERDICT ? NFT_DATA_VERDICT : NFT_DATA_VALUE; 246 } 247 248 static inline enum nft_registers nft_type_to_reg(enum nft_data_types type) 249 { 250 return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1 * NFT_REG_SIZE / NFT_REG32_SIZE; 251 } 252 253 int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest); 254 int nft_dump_register(struct sk_buff *skb, unsigned int attr, unsigned int reg); 255 256 int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len); 257 int nft_parse_register_store(const struct nft_ctx *ctx, 258 const struct nlattr *attr, u8 *dreg, 259 const struct nft_data *data, 260 enum nft_data_types type, unsigned int len); 261 262 /** 263 * struct nft_userdata - user defined data associated with an object 264 * 265 * @len: length of the data 266 * @data: content 267 * 268 * The presence of user data is indicated in an object specific fashion, 269 * so a length of zero can't occur and the value "len" indicates data 270 * of length len + 1. 271 */ 272 struct nft_userdata { 273 u8 len; 274 unsigned char data[]; 275 }; 276 277 /** 278 * struct nft_set_elem - generic representation of set elements 279 * 280 * @key: element key 281 * @key_end: closing element key 282 * @priv: element private data and extensions 283 */ 284 struct nft_set_elem { 285 union { 286 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 287 struct nft_data val; 288 } key; 289 union { 290 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 291 struct nft_data val; 292 } key_end; 293 union { 294 u32 buf[NFT_DATA_VALUE_MAXLEN / sizeof(u32)]; 295 struct nft_data val; 296 } data; 297 void *priv; 298 }; 299 300 struct nft_set; 301 struct nft_set_iter { 302 u8 genmask; 303 unsigned int count; 304 unsigned int skip; 305 int err; 306 int (*fn)(const struct nft_ctx *ctx, 307 struct nft_set *set, 308 const struct nft_set_iter *iter, 309 struct nft_set_elem *elem); 310 }; 311 312 /** 313 * struct nft_set_desc - description of set elements 314 * 315 * @ktype: key type 316 * @klen: key length 317 * @dtype: data type 318 * @dlen: data length 319 * @objtype: object type 320 * @flags: flags 321 * @size: number of set elements 322 * @policy: set policy 323 * @gc_int: garbage collector interval 324 * @field_len: length of each field in concatenation, bytes 325 * @field_count: number of concatenated fields in element 326 * @expr: set must support for expressions 327 */ 328 struct nft_set_desc { 329 u32 ktype; 330 unsigned int klen; 331 u32 dtype; 332 unsigned int dlen; 333 u32 objtype; 334 unsigned int size; 335 u32 policy; 336 u32 gc_int; 337 u64 timeout; 338 u8 field_len[NFT_REG32_COUNT]; 339 u8 field_count; 340 bool expr; 341 }; 342 343 /** 344 * enum nft_set_class - performance class 345 * 346 * @NFT_LOOKUP_O_1: constant, O(1) 347 * @NFT_LOOKUP_O_LOG_N: logarithmic, O(log N) 348 * @NFT_LOOKUP_O_N: linear, O(N) 349 */ 350 enum nft_set_class { 351 NFT_SET_CLASS_O_1, 352 NFT_SET_CLASS_O_LOG_N, 353 NFT_SET_CLASS_O_N, 354 }; 355 356 /** 357 * struct nft_set_estimate - estimation of memory and performance 358 * characteristics 359 * 360 * @size: required memory 361 * @lookup: lookup performance class 362 * @space: memory class 363 */ 364 struct nft_set_estimate { 365 u64 size; 366 enum nft_set_class lookup; 367 enum nft_set_class space; 368 }; 369 370 #define NFT_EXPR_MAXATTR 16 371 #define NFT_EXPR_SIZE(size) (sizeof(struct nft_expr) + \ 372 ALIGN(size, __alignof__(struct nft_expr))) 373 374 /** 375 * struct nft_expr - nf_tables expression 376 * 377 * @ops: expression ops 378 * @data: expression private data 379 */ 380 struct nft_expr { 381 const struct nft_expr_ops *ops; 382 unsigned char data[] 383 __attribute__((aligned(__alignof__(u64)))); 384 }; 385 386 static inline void *nft_expr_priv(const struct nft_expr *expr) 387 { 388 return (void *)expr->data; 389 } 390 391 struct nft_expr_info; 392 393 int nft_expr_inner_parse(const struct nft_ctx *ctx, const struct nlattr *nla, 394 struct nft_expr_info *info); 395 int nft_expr_clone(struct nft_expr *dst, struct nft_expr *src); 396 void nft_expr_destroy(const struct nft_ctx *ctx, struct nft_expr *expr); 397 int nft_expr_dump(struct sk_buff *skb, unsigned int attr, 398 const struct nft_expr *expr, bool reset); 399 bool nft_expr_reduce_bitwise(struct nft_regs_track *track, 400 const struct nft_expr *expr); 401 402 struct nft_set_ext; 403 404 /** 405 * struct nft_set_ops - nf_tables set operations 406 * 407 * @lookup: look up an element within the set 408 * @update: update an element if exists, add it if doesn't exist 409 * @delete: delete an element 410 * @insert: insert new element into set 411 * @activate: activate new element in the next generation 412 * @deactivate: lookup for element and deactivate it in the next generation 413 * @flush: deactivate element in the next generation 414 * @remove: remove element from set 415 * @walk: iterate over all set elements 416 * @get: get set elements 417 * @privsize: function to return size of set private data 418 * @init: initialize private data of new set instance 419 * @destroy: destroy private data of set instance 420 * @elemsize: element private size 421 * 422 * Operations lookup, update and delete have simpler interfaces, are faster 423 * and currently only used in the packet path. All the rest are slower, 424 * control plane functions. 425 */ 426 struct nft_set_ops { 427 bool (*lookup)(const struct net *net, 428 const struct nft_set *set, 429 const u32 *key, 430 const struct nft_set_ext **ext); 431 bool (*update)(struct nft_set *set, 432 const u32 *key, 433 void *(*new)(struct nft_set *, 434 const struct nft_expr *, 435 struct nft_regs *), 436 const struct nft_expr *expr, 437 struct nft_regs *regs, 438 const struct nft_set_ext **ext); 439 bool (*delete)(const struct nft_set *set, 440 const u32 *key); 441 442 int (*insert)(const struct net *net, 443 const struct nft_set *set, 444 const struct nft_set_elem *elem, 445 struct nft_set_ext **ext); 446 void (*activate)(const struct net *net, 447 const struct nft_set *set, 448 const struct nft_set_elem *elem); 449 void * (*deactivate)(const struct net *net, 450 const struct nft_set *set, 451 const struct nft_set_elem *elem); 452 bool (*flush)(const struct net *net, 453 const struct nft_set *set, 454 void *priv); 455 void (*remove)(const struct net *net, 456 const struct nft_set *set, 457 const struct nft_set_elem *elem); 458 void (*walk)(const struct nft_ctx *ctx, 459 struct nft_set *set, 460 struct nft_set_iter *iter); 461 void * (*get)(const struct net *net, 462 const struct nft_set *set, 463 const struct nft_set_elem *elem, 464 unsigned int flags); 465 void (*commit)(const struct nft_set *set); 466 void (*abort)(const struct nft_set *set); 467 u64 (*privsize)(const struct nlattr * const nla[], 468 const struct nft_set_desc *desc); 469 bool (*estimate)(const struct nft_set_desc *desc, 470 u32 features, 471 struct nft_set_estimate *est); 472 int (*init)(const struct nft_set *set, 473 const struct nft_set_desc *desc, 474 const struct nlattr * const nla[]); 475 void (*destroy)(const struct nft_ctx *ctx, 476 const struct nft_set *set); 477 void (*gc_init)(const struct nft_set *set); 478 479 unsigned int elemsize; 480 }; 481 482 /** 483 * struct nft_set_type - nf_tables set type 484 * 485 * @ops: set ops for this type 486 * @features: features supported by the implementation 487 */ 488 struct nft_set_type { 489 const struct nft_set_ops ops; 490 u32 features; 491 }; 492 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 493 494 struct nft_set_elem_expr { 495 u8 size; 496 unsigned char data[] 497 __attribute__((aligned(__alignof__(struct nft_expr)))); 498 }; 499 500 #define nft_setelem_expr_at(__elem_expr, __offset) \ 501 ((struct nft_expr *)&__elem_expr->data[__offset]) 502 503 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 504 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 505 __size < (__elem_expr)->size; \ 506 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 507 508 #define NFT_SET_EXPR_MAX 2 509 510 /** 511 * struct nft_set - nf_tables set instance 512 * 513 * @list: table set list node 514 * @bindings: list of set bindings 515 * @refs: internal refcounting for async set destruction 516 * @table: table this set belongs to 517 * @net: netnamespace this set belongs to 518 * @name: name of the set 519 * @handle: unique handle of the set 520 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 521 * @dtype: data type (verdict or numeric type defined by userspace) 522 * @objtype: object type (see NFT_OBJECT_* definitions) 523 * @size: maximum set size 524 * @field_len: length of each field in concatenation, bytes 525 * @field_count: number of concatenated fields in element 526 * @use: number of rules references to this set 527 * @nelems: number of elements 528 * @ndeact: number of deactivated elements queued for removal 529 * @timeout: default timeout value in jiffies 530 * @gc_int: garbage collection interval in msecs 531 * @policy: set parameterization (see enum nft_set_policies) 532 * @udlen: user data length 533 * @udata: user data 534 * @expr: stateful expression 535 * @ops: set ops 536 * @flags: set flags 537 * @dead: set will be freed, never cleared 538 * @genmask: generation mask 539 * @klen: key length 540 * @dlen: data length 541 * @data: private set data 542 */ 543 struct nft_set { 544 struct list_head list; 545 struct list_head bindings; 546 refcount_t refs; 547 struct nft_table *table; 548 possible_net_t net; 549 char *name; 550 u64 handle; 551 u32 ktype; 552 u32 dtype; 553 u32 objtype; 554 u32 size; 555 u8 field_len[NFT_REG32_COUNT]; 556 u8 field_count; 557 u32 use; 558 atomic_t nelems; 559 u32 ndeact; 560 u64 timeout; 561 u32 gc_int; 562 u16 policy; 563 u16 udlen; 564 unsigned char *udata; 565 struct list_head pending_update; 566 /* runtime data below here */ 567 const struct nft_set_ops *ops ____cacheline_aligned; 568 u16 flags:13, 569 dead:1, 570 genmask:2; 571 u8 klen; 572 u8 dlen; 573 u8 num_exprs; 574 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 575 struct list_head catchall_list; 576 unsigned char data[] 577 __attribute__((aligned(__alignof__(u64)))); 578 }; 579 580 static inline bool nft_set_is_anonymous(const struct nft_set *set) 581 { 582 return set->flags & NFT_SET_ANONYMOUS; 583 } 584 585 static inline void *nft_set_priv(const struct nft_set *set) 586 { 587 return (void *)set->data; 588 } 589 590 static inline struct nft_set *nft_set_container_of(const void *priv) 591 { 592 return (void *)priv - offsetof(struct nft_set, data); 593 } 594 595 struct nft_set *nft_set_lookup_global(const struct net *net, 596 const struct nft_table *table, 597 const struct nlattr *nla_set_name, 598 const struct nlattr *nla_set_id, 599 u8 genmask); 600 601 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 602 const struct nft_set *set); 603 604 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 605 { 606 u32 gc_int = READ_ONCE(set->gc_int); 607 608 return gc_int ? msecs_to_jiffies(gc_int) : HZ; 609 } 610 611 /** 612 * struct nft_set_binding - nf_tables set binding 613 * 614 * @list: set bindings list node 615 * @chain: chain containing the rule bound to the set 616 * @flags: set action flags 617 * 618 * A set binding contains all information necessary for validation 619 * of new elements added to a bound set. 620 */ 621 struct nft_set_binding { 622 struct list_head list; 623 const struct nft_chain *chain; 624 u32 flags; 625 }; 626 627 enum nft_trans_phase; 628 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set); 629 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 630 struct nft_set_binding *binding, 631 enum nft_trans_phase phase); 632 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 633 struct nft_set_binding *binding); 634 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 635 636 /** 637 * enum nft_set_extensions - set extension type IDs 638 * 639 * @NFT_SET_EXT_KEY: element key 640 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 641 * @NFT_SET_EXT_DATA: mapping data 642 * @NFT_SET_EXT_FLAGS: element flags 643 * @NFT_SET_EXT_TIMEOUT: element timeout 644 * @NFT_SET_EXT_EXPIRATION: element expiration time 645 * @NFT_SET_EXT_USERDATA: user data associated with the element 646 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 647 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 648 * @NFT_SET_EXT_NUM: number of extension types 649 */ 650 enum nft_set_extensions { 651 NFT_SET_EXT_KEY, 652 NFT_SET_EXT_KEY_END, 653 NFT_SET_EXT_DATA, 654 NFT_SET_EXT_FLAGS, 655 NFT_SET_EXT_TIMEOUT, 656 NFT_SET_EXT_EXPIRATION, 657 NFT_SET_EXT_USERDATA, 658 NFT_SET_EXT_EXPRESSIONS, 659 NFT_SET_EXT_OBJREF, 660 NFT_SET_EXT_NUM 661 }; 662 663 /** 664 * struct nft_set_ext_type - set extension type 665 * 666 * @len: fixed part length of the extension 667 * @align: alignment requirements of the extension 668 */ 669 struct nft_set_ext_type { 670 u8 len; 671 u8 align; 672 }; 673 674 extern const struct nft_set_ext_type nft_set_ext_types[]; 675 676 /** 677 * struct nft_set_ext_tmpl - set extension template 678 * 679 * @len: length of extension area 680 * @offset: offsets of individual extension types 681 */ 682 struct nft_set_ext_tmpl { 683 u16 len; 684 u8 offset[NFT_SET_EXT_NUM]; 685 u8 ext_len[NFT_SET_EXT_NUM]; 686 }; 687 688 /** 689 * struct nft_set_ext - set extensions 690 * 691 * @genmask: generation mask 692 * @offset: offsets of individual extension types 693 * @data: beginning of extension data 694 */ 695 struct nft_set_ext { 696 u8 genmask; 697 u8 offset[NFT_SET_EXT_NUM]; 698 char data[]; 699 }; 700 701 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 702 { 703 memset(tmpl, 0, sizeof(*tmpl)); 704 tmpl->len = sizeof(struct nft_set_ext); 705 } 706 707 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 708 unsigned int len) 709 { 710 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 711 if (tmpl->len > U8_MAX) 712 return -EINVAL; 713 714 tmpl->offset[id] = tmpl->len; 715 tmpl->ext_len[id] = nft_set_ext_types[id].len + len; 716 tmpl->len += tmpl->ext_len[id]; 717 718 return 0; 719 } 720 721 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 722 { 723 return nft_set_ext_add_length(tmpl, id, 0); 724 } 725 726 static inline void nft_set_ext_init(struct nft_set_ext *ext, 727 const struct nft_set_ext_tmpl *tmpl) 728 { 729 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 730 } 731 732 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 733 { 734 return !!ext->offset[id]; 735 } 736 737 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 738 { 739 return ext && __nft_set_ext_exists(ext, id); 740 } 741 742 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 743 { 744 return (void *)ext + ext->offset[id]; 745 } 746 747 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 748 { 749 return nft_set_ext(ext, NFT_SET_EXT_KEY); 750 } 751 752 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 753 { 754 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 755 } 756 757 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 758 { 759 return nft_set_ext(ext, NFT_SET_EXT_DATA); 760 } 761 762 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 763 { 764 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 765 } 766 767 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 768 { 769 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 770 } 771 772 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 773 { 774 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 775 } 776 777 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 778 { 779 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 780 } 781 782 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 783 { 784 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 785 } 786 787 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 788 { 789 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 790 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 791 } 792 793 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 794 void *elem) 795 { 796 return elem + set->ops->elemsize; 797 } 798 799 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 800 { 801 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 802 } 803 804 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 805 const struct nft_set *set, 806 const struct nlattr *attr); 807 808 void *nft_set_elem_init(const struct nft_set *set, 809 const struct nft_set_ext_tmpl *tmpl, 810 const u32 *key, const u32 *key_end, const u32 *data, 811 u64 timeout, u64 expiration, gfp_t gfp); 812 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 813 struct nft_expr *expr_array[]); 814 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 815 bool destroy_expr); 816 void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, 817 const struct nft_set *set, void *elem); 818 819 struct nft_expr_ops; 820 /** 821 * struct nft_expr_type - nf_tables expression type 822 * 823 * @select_ops: function to select nft_expr_ops 824 * @release_ops: release nft_expr_ops 825 * @ops: default ops, used when no select_ops functions is present 826 * @list: used internally 827 * @name: Identifier 828 * @owner: module reference 829 * @policy: netlink attribute policy 830 * @maxattr: highest netlink attribute number 831 * @family: address family for AF-specific types 832 * @flags: expression type flags 833 */ 834 struct nft_expr_type { 835 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 836 const struct nlattr * const tb[]); 837 void (*release_ops)(const struct nft_expr_ops *ops); 838 const struct nft_expr_ops *ops; 839 const struct nft_expr_ops *inner_ops; 840 struct list_head list; 841 const char *name; 842 struct module *owner; 843 const struct nla_policy *policy; 844 unsigned int maxattr; 845 u8 family; 846 u8 flags; 847 }; 848 849 #define NFT_EXPR_STATEFUL 0x1 850 #define NFT_EXPR_GC 0x2 851 852 enum nft_trans_phase { 853 NFT_TRANS_PREPARE, 854 NFT_TRANS_PREPARE_ERROR, 855 NFT_TRANS_ABORT, 856 NFT_TRANS_COMMIT, 857 NFT_TRANS_RELEASE 858 }; 859 860 struct nft_flow_rule; 861 struct nft_offload_ctx; 862 863 /** 864 * struct nft_expr_ops - nf_tables expression operations 865 * 866 * @eval: Expression evaluation function 867 * @size: full expression size, including private data size 868 * @init: initialization function 869 * @activate: activate expression in the next generation 870 * @deactivate: deactivate expression in next generation 871 * @destroy: destruction function, called after synchronize_rcu 872 * @dump: function to dump parameters 873 * @type: expression type 874 * @validate: validate expression, called during loop detection 875 * @data: extra data to attach to this expression operation 876 */ 877 struct nft_expr_ops { 878 void (*eval)(const struct nft_expr *expr, 879 struct nft_regs *regs, 880 const struct nft_pktinfo *pkt); 881 int (*clone)(struct nft_expr *dst, 882 const struct nft_expr *src); 883 unsigned int size; 884 885 int (*init)(const struct nft_ctx *ctx, 886 const struct nft_expr *expr, 887 const struct nlattr * const tb[]); 888 void (*activate)(const struct nft_ctx *ctx, 889 const struct nft_expr *expr); 890 void (*deactivate)(const struct nft_ctx *ctx, 891 const struct nft_expr *expr, 892 enum nft_trans_phase phase); 893 void (*destroy)(const struct nft_ctx *ctx, 894 const struct nft_expr *expr); 895 void (*destroy_clone)(const struct nft_ctx *ctx, 896 const struct nft_expr *expr); 897 int (*dump)(struct sk_buff *skb, 898 const struct nft_expr *expr, 899 bool reset); 900 int (*validate)(const struct nft_ctx *ctx, 901 const struct nft_expr *expr, 902 const struct nft_data **data); 903 bool (*reduce)(struct nft_regs_track *track, 904 const struct nft_expr *expr); 905 bool (*gc)(struct net *net, 906 const struct nft_expr *expr); 907 int (*offload)(struct nft_offload_ctx *ctx, 908 struct nft_flow_rule *flow, 909 const struct nft_expr *expr); 910 bool (*offload_action)(const struct nft_expr *expr); 911 void (*offload_stats)(struct nft_expr *expr, 912 const struct flow_stats *stats); 913 const struct nft_expr_type *type; 914 void *data; 915 }; 916 917 /** 918 * struct nft_rule - nf_tables rule 919 * 920 * @list: used internally 921 * @handle: rule handle 922 * @genmask: generation mask 923 * @dlen: length of expression data 924 * @udata: user data is appended to the rule 925 * @data: expression data 926 */ 927 struct nft_rule { 928 struct list_head list; 929 u64 handle:42, 930 genmask:2, 931 dlen:12, 932 udata:1; 933 unsigned char data[] 934 __attribute__((aligned(__alignof__(struct nft_expr)))); 935 }; 936 937 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 938 { 939 return (struct nft_expr *)&rule->data[0]; 940 } 941 942 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 943 { 944 return ((void *)expr) + expr->ops->size; 945 } 946 947 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 948 { 949 return (struct nft_expr *)&rule->data[rule->dlen]; 950 } 951 952 static inline bool nft_expr_more(const struct nft_rule *rule, 953 const struct nft_expr *expr) 954 { 955 return expr != nft_expr_last(rule) && expr->ops; 956 } 957 958 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 959 { 960 return (void *)&rule->data[rule->dlen]; 961 } 962 963 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule); 964 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule, 965 enum nft_trans_phase phase); 966 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule); 967 968 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 969 struct nft_regs *regs, 970 const struct nft_pktinfo *pkt) 971 { 972 struct nft_set_elem_expr *elem_expr; 973 struct nft_expr *expr; 974 u32 size; 975 976 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 977 elem_expr = nft_set_ext_expr(ext); 978 nft_setelem_expr_foreach(expr, elem_expr, size) { 979 expr->ops->eval(expr, regs, pkt); 980 if (regs->verdict.code == NFT_BREAK) 981 return; 982 } 983 } 984 } 985 986 /* 987 * The last pointer isn't really necessary, but the compiler isn't able to 988 * determine that the result of nft_expr_last() is always the same since it 989 * can't assume that the dlen value wasn't changed within calls in the loop. 990 */ 991 #define nft_rule_for_each_expr(expr, last, rule) \ 992 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 993 (expr) != (last); \ 994 (expr) = nft_expr_next(expr)) 995 996 #define NFT_CHAIN_POLICY_UNSET U8_MAX 997 998 struct nft_rule_dp { 999 u64 is_last:1, 1000 dlen:12, 1001 handle:42; /* for tracing */ 1002 unsigned char data[] 1003 __attribute__((aligned(__alignof__(struct nft_expr)))); 1004 }; 1005 1006 struct nft_rule_dp_last { 1007 struct nft_rule_dp end; /* end of nft_rule_blob marker */ 1008 struct rcu_head h; /* call_rcu head */ 1009 struct nft_rule_blob *blob; /* ptr to free via call_rcu */ 1010 const struct nft_chain *chain; /* for nftables tracing */ 1011 }; 1012 1013 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule) 1014 { 1015 return (void *)rule + sizeof(*rule) + rule->dlen; 1016 } 1017 1018 struct nft_rule_blob { 1019 unsigned long size; 1020 unsigned char data[] 1021 __attribute__((aligned(__alignof__(struct nft_rule_dp)))); 1022 }; 1023 1024 /** 1025 * struct nft_chain - nf_tables chain 1026 * 1027 * @rules: list of rules in the chain 1028 * @list: used internally 1029 * @rhlhead: used internally 1030 * @table: table that this chain belongs to 1031 * @handle: chain handle 1032 * @use: number of jump references to this chain 1033 * @flags: bitmask of enum nft_chain_flags 1034 * @name: name of the chain 1035 */ 1036 struct nft_chain { 1037 struct nft_rule_blob __rcu *blob_gen_0; 1038 struct nft_rule_blob __rcu *blob_gen_1; 1039 struct list_head rules; 1040 struct list_head list; 1041 struct rhlist_head rhlhead; 1042 struct nft_table *table; 1043 u64 handle; 1044 u32 use; 1045 u8 flags:5, 1046 bound:1, 1047 genmask:2; 1048 char *name; 1049 u16 udlen; 1050 u8 *udata; 1051 1052 /* Only used during control plane commit phase: */ 1053 struct nft_rule_blob *blob_next; 1054 }; 1055 1056 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 1057 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set, 1058 const struct nft_set_iter *iter, 1059 struct nft_set_elem *elem); 1060 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set); 1061 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1062 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1063 1064 enum nft_chain_types { 1065 NFT_CHAIN_T_DEFAULT = 0, 1066 NFT_CHAIN_T_ROUTE, 1067 NFT_CHAIN_T_NAT, 1068 NFT_CHAIN_T_MAX 1069 }; 1070 1071 /** 1072 * struct nft_chain_type - nf_tables chain type info 1073 * 1074 * @name: name of the type 1075 * @type: numeric identifier 1076 * @family: address family 1077 * @owner: module owner 1078 * @hook_mask: mask of valid hooks 1079 * @hooks: array of hook functions 1080 * @ops_register: base chain register function 1081 * @ops_unregister: base chain unregister function 1082 */ 1083 struct nft_chain_type { 1084 const char *name; 1085 enum nft_chain_types type; 1086 int family; 1087 struct module *owner; 1088 unsigned int hook_mask; 1089 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1090 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1091 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1092 }; 1093 1094 int nft_chain_validate_dependency(const struct nft_chain *chain, 1095 enum nft_chain_types type); 1096 int nft_chain_validate_hooks(const struct nft_chain *chain, 1097 unsigned int hook_flags); 1098 1099 static inline bool nft_chain_binding(const struct nft_chain *chain) 1100 { 1101 return chain->flags & NFT_CHAIN_BINDING; 1102 } 1103 1104 static inline bool nft_chain_is_bound(struct nft_chain *chain) 1105 { 1106 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1107 } 1108 1109 int nft_chain_add(struct nft_table *table, struct nft_chain *chain); 1110 void nft_chain_del(struct nft_chain *chain); 1111 void nf_tables_chain_destroy(struct nft_ctx *ctx); 1112 1113 struct nft_stats { 1114 u64 bytes; 1115 u64 pkts; 1116 struct u64_stats_sync syncp; 1117 }; 1118 1119 struct nft_hook { 1120 struct list_head list; 1121 struct nf_hook_ops ops; 1122 struct rcu_head rcu; 1123 }; 1124 1125 /** 1126 * struct nft_base_chain - nf_tables base chain 1127 * 1128 * @ops: netfilter hook ops 1129 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1130 * @type: chain type 1131 * @policy: default policy 1132 * @stats: per-cpu chain stats 1133 * @chain: the chain 1134 * @flow_block: flow block (for hardware offload) 1135 */ 1136 struct nft_base_chain { 1137 struct nf_hook_ops ops; 1138 struct list_head hook_list; 1139 const struct nft_chain_type *type; 1140 u8 policy; 1141 u8 flags; 1142 struct nft_stats __percpu *stats; 1143 struct nft_chain chain; 1144 struct flow_block flow_block; 1145 }; 1146 1147 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1148 { 1149 return container_of(chain, struct nft_base_chain, chain); 1150 } 1151 1152 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1153 { 1154 return chain->flags & NFT_CHAIN_BASE; 1155 } 1156 1157 int __nft_release_basechain(struct nft_ctx *ctx); 1158 1159 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1160 1161 static inline bool nft_use_inc(u32 *use) 1162 { 1163 if (*use == UINT_MAX) 1164 return false; 1165 1166 (*use)++; 1167 1168 return true; 1169 } 1170 1171 static inline void nft_use_dec(u32 *use) 1172 { 1173 WARN_ON_ONCE((*use)-- == 0); 1174 } 1175 1176 /* For error and abort path: restore use counter to previous state. */ 1177 static inline void nft_use_inc_restore(u32 *use) 1178 { 1179 WARN_ON_ONCE(!nft_use_inc(use)); 1180 } 1181 1182 #define nft_use_dec_restore nft_use_dec 1183 1184 /** 1185 * struct nft_table - nf_tables table 1186 * 1187 * @list: used internally 1188 * @chains_ht: chains in the table 1189 * @chains: same, for stable walks 1190 * @sets: sets in the table 1191 * @objects: stateful objects in the table 1192 * @flowtables: flow tables in the table 1193 * @hgenerator: handle generator state 1194 * @handle: table handle 1195 * @use: number of chain references to this table 1196 * @flags: table flag (see enum nft_table_flags) 1197 * @genmask: generation mask 1198 * @afinfo: address family info 1199 * @name: name of the table 1200 * @validate_state: internal, set when transaction adds jumps 1201 */ 1202 struct nft_table { 1203 struct list_head list; 1204 struct rhltable chains_ht; 1205 struct list_head chains; 1206 struct list_head sets; 1207 struct list_head objects; 1208 struct list_head flowtables; 1209 u64 hgenerator; 1210 u64 handle; 1211 u32 use; 1212 u16 family:6, 1213 flags:8, 1214 genmask:2; 1215 u32 nlpid; 1216 char *name; 1217 u16 udlen; 1218 u8 *udata; 1219 u8 validate_state; 1220 }; 1221 1222 static inline bool nft_table_has_owner(const struct nft_table *table) 1223 { 1224 return table->flags & NFT_TABLE_F_OWNER; 1225 } 1226 1227 static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1228 { 1229 return family == NFPROTO_NETDEV || 1230 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1231 } 1232 1233 void nft_register_chain_type(const struct nft_chain_type *); 1234 void nft_unregister_chain_type(const struct nft_chain_type *); 1235 1236 int nft_register_expr(struct nft_expr_type *); 1237 void nft_unregister_expr(struct nft_expr_type *); 1238 1239 int nft_verdict_dump(struct sk_buff *skb, int type, 1240 const struct nft_verdict *v); 1241 1242 /** 1243 * struct nft_object_hash_key - key to lookup nft_object 1244 * 1245 * @name: name of the stateful object to look up 1246 * @table: table the object belongs to 1247 */ 1248 struct nft_object_hash_key { 1249 const char *name; 1250 const struct nft_table *table; 1251 }; 1252 1253 /** 1254 * struct nft_object - nf_tables stateful object 1255 * 1256 * @list: table stateful object list node 1257 * @key: keys that identify this object 1258 * @rhlhead: nft_objname_ht node 1259 * @genmask: generation mask 1260 * @use: number of references to this stateful object 1261 * @handle: unique object handle 1262 * @ops: object operations 1263 * @data: object data, layout depends on type 1264 */ 1265 struct nft_object { 1266 struct list_head list; 1267 struct rhlist_head rhlhead; 1268 struct nft_object_hash_key key; 1269 u32 genmask:2; 1270 u32 use; 1271 u64 handle; 1272 u16 udlen; 1273 u8 *udata; 1274 /* runtime data below here */ 1275 const struct nft_object_ops *ops ____cacheline_aligned; 1276 unsigned char data[] 1277 __attribute__((aligned(__alignof__(u64)))); 1278 }; 1279 1280 static inline void *nft_obj_data(const struct nft_object *obj) 1281 { 1282 return (void *)obj->data; 1283 } 1284 1285 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1286 1287 struct nft_object *nft_obj_lookup(const struct net *net, 1288 const struct nft_table *table, 1289 const struct nlattr *nla, u32 objtype, 1290 u8 genmask); 1291 1292 void nft_obj_notify(struct net *net, const struct nft_table *table, 1293 struct nft_object *obj, u32 portid, u32 seq, 1294 int event, u16 flags, int family, int report, gfp_t gfp); 1295 1296 /** 1297 * struct nft_object_type - stateful object type 1298 * 1299 * @select_ops: function to select nft_object_ops 1300 * @ops: default ops, used when no select_ops functions is present 1301 * @list: list node in list of object types 1302 * @type: stateful object numeric type 1303 * @owner: module owner 1304 * @maxattr: maximum netlink attribute 1305 * @policy: netlink attribute policy 1306 */ 1307 struct nft_object_type { 1308 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1309 const struct nlattr * const tb[]); 1310 const struct nft_object_ops *ops; 1311 struct list_head list; 1312 u32 type; 1313 unsigned int maxattr; 1314 struct module *owner; 1315 const struct nla_policy *policy; 1316 }; 1317 1318 /** 1319 * struct nft_object_ops - stateful object operations 1320 * 1321 * @eval: stateful object evaluation function 1322 * @size: stateful object size 1323 * @init: initialize object from netlink attributes 1324 * @destroy: release existing stateful object 1325 * @dump: netlink dump stateful object 1326 * @update: update stateful object 1327 */ 1328 struct nft_object_ops { 1329 void (*eval)(struct nft_object *obj, 1330 struct nft_regs *regs, 1331 const struct nft_pktinfo *pkt); 1332 unsigned int size; 1333 int (*init)(const struct nft_ctx *ctx, 1334 const struct nlattr *const tb[], 1335 struct nft_object *obj); 1336 void (*destroy)(const struct nft_ctx *ctx, 1337 struct nft_object *obj); 1338 int (*dump)(struct sk_buff *skb, 1339 struct nft_object *obj, 1340 bool reset); 1341 void (*update)(struct nft_object *obj, 1342 struct nft_object *newobj); 1343 const struct nft_object_type *type; 1344 }; 1345 1346 int nft_register_obj(struct nft_object_type *obj_type); 1347 void nft_unregister_obj(struct nft_object_type *obj_type); 1348 1349 #define NFT_NETDEVICE_MAX 256 1350 1351 /** 1352 * struct nft_flowtable - nf_tables flow table 1353 * 1354 * @list: flow table list node in table list 1355 * @table: the table the flow table is contained in 1356 * @name: name of this flow table 1357 * @hooknum: hook number 1358 * @ops_len: number of hooks in array 1359 * @genmask: generation mask 1360 * @use: number of references to this flow table 1361 * @handle: unique object handle 1362 * @dev_name: array of device names 1363 * @data: rhashtable and garbage collector 1364 * @ops: array of hooks 1365 */ 1366 struct nft_flowtable { 1367 struct list_head list; 1368 struct nft_table *table; 1369 char *name; 1370 int hooknum; 1371 int ops_len; 1372 u32 genmask:2; 1373 u32 use; 1374 u64 handle; 1375 /* runtime data below here */ 1376 struct list_head hook_list ____cacheline_aligned; 1377 struct nf_flowtable data; 1378 }; 1379 1380 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1381 const struct nlattr *nla, 1382 u8 genmask); 1383 1384 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1385 struct nft_flowtable *flowtable, 1386 enum nft_trans_phase phase); 1387 1388 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1389 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1390 1391 /** 1392 * struct nft_traceinfo - nft tracing information and state 1393 * 1394 * @trace: other struct members are initialised 1395 * @nf_trace: copy of skb->nf_trace before rule evaluation 1396 * @type: event type (enum nft_trace_types) 1397 * @skbid: hash of skb to be used as trace id 1398 * @packet_dumped: packet headers sent in a previous traceinfo message 1399 * @basechain: base chain currently processed 1400 */ 1401 struct nft_traceinfo { 1402 bool trace; 1403 bool nf_trace; 1404 bool packet_dumped; 1405 enum nft_trace_types type:8; 1406 u32 skbid; 1407 const struct nft_base_chain *basechain; 1408 }; 1409 1410 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1411 const struct nft_chain *basechain); 1412 1413 void nft_trace_notify(const struct nft_pktinfo *pkt, 1414 const struct nft_verdict *verdict, 1415 const struct nft_rule_dp *rule, 1416 struct nft_traceinfo *info); 1417 1418 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1419 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1420 1421 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1422 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1423 1424 #define MODULE_ALIAS_NFT_EXPR(name) \ 1425 MODULE_ALIAS("nft-expr-" name) 1426 1427 #define MODULE_ALIAS_NFT_OBJ(type) \ 1428 MODULE_ALIAS("nft-obj-" __stringify(type)) 1429 1430 #if IS_ENABLED(CONFIG_NF_TABLES) 1431 1432 /* 1433 * The gencursor defines two generations, the currently active and the 1434 * next one. Objects contain a bitmask of 2 bits specifying the generations 1435 * they're active in. A set bit means they're inactive in the generation 1436 * represented by that bit. 1437 * 1438 * New objects start out as inactive in the current and active in the 1439 * next generation. When committing the ruleset the bitmask is cleared, 1440 * meaning they're active in all generations. When removing an object, 1441 * it is set inactive in the next generation. After committing the ruleset, 1442 * the objects are removed. 1443 */ 1444 static inline unsigned int nft_gencursor_next(const struct net *net) 1445 { 1446 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1447 } 1448 1449 static inline u8 nft_genmask_next(const struct net *net) 1450 { 1451 return 1 << nft_gencursor_next(net); 1452 } 1453 1454 static inline u8 nft_genmask_cur(const struct net *net) 1455 { 1456 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1457 return 1 << READ_ONCE(net->nft.gencursor); 1458 } 1459 1460 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1461 1462 /* 1463 * Generic transaction helpers 1464 */ 1465 1466 /* Check if this object is currently active. */ 1467 #define nft_is_active(__net, __obj) \ 1468 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1469 1470 /* Check if this object is active in the next generation. */ 1471 #define nft_is_active_next(__net, __obj) \ 1472 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1473 1474 /* This object becomes active in the next generation. */ 1475 #define nft_activate_next(__net, __obj) \ 1476 (__obj)->genmask = nft_genmask_cur(__net) 1477 1478 /* This object becomes inactive in the next generation. */ 1479 #define nft_deactivate_next(__net, __obj) \ 1480 (__obj)->genmask = nft_genmask_next(__net) 1481 1482 /* After committing the ruleset, clear the stale generation bit. */ 1483 #define nft_clear(__net, __obj) \ 1484 (__obj)->genmask &= ~nft_genmask_next(__net) 1485 #define nft_active_genmask(__obj, __genmask) \ 1486 !((__obj)->genmask & __genmask) 1487 1488 /* 1489 * Set element transaction helpers 1490 */ 1491 1492 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1493 u8 genmask) 1494 { 1495 return !(ext->genmask & genmask); 1496 } 1497 1498 static inline void nft_set_elem_change_active(const struct net *net, 1499 const struct nft_set *set, 1500 struct nft_set_ext *ext) 1501 { 1502 ext->genmask ^= nft_genmask_next(net); 1503 } 1504 1505 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1506 1507 #define NFT_SET_ELEM_DEAD_MASK (1 << 2) 1508 1509 #if defined(__LITTLE_ENDIAN_BITFIELD) 1510 #define NFT_SET_ELEM_DEAD_BIT 2 1511 #elif defined(__BIG_ENDIAN_BITFIELD) 1512 #define NFT_SET_ELEM_DEAD_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1513 #else 1514 #error 1515 #endif 1516 1517 static inline void nft_set_elem_dead(struct nft_set_ext *ext) 1518 { 1519 unsigned long *word = (unsigned long *)ext; 1520 1521 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1522 set_bit(NFT_SET_ELEM_DEAD_BIT, word); 1523 } 1524 1525 static inline int nft_set_elem_is_dead(const struct nft_set_ext *ext) 1526 { 1527 unsigned long *word = (unsigned long *)ext; 1528 1529 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1530 return test_bit(NFT_SET_ELEM_DEAD_BIT, word); 1531 } 1532 1533 /** 1534 * struct nft_trans - nf_tables object update in transaction 1535 * 1536 * @list: used internally 1537 * @binding_list: list of objects with possible bindings 1538 * @msg_type: message type 1539 * @put_net: ctx->net needs to be put 1540 * @ctx: transaction context 1541 * @data: internal information related to the transaction 1542 */ 1543 struct nft_trans { 1544 struct list_head list; 1545 struct list_head binding_list; 1546 int msg_type; 1547 bool put_net; 1548 struct nft_ctx ctx; 1549 char data[]; 1550 }; 1551 1552 struct nft_trans_rule { 1553 struct nft_rule *rule; 1554 struct nft_flow_rule *flow; 1555 u32 rule_id; 1556 bool bound; 1557 }; 1558 1559 #define nft_trans_rule(trans) \ 1560 (((struct nft_trans_rule *)trans->data)->rule) 1561 #define nft_trans_flow_rule(trans) \ 1562 (((struct nft_trans_rule *)trans->data)->flow) 1563 #define nft_trans_rule_id(trans) \ 1564 (((struct nft_trans_rule *)trans->data)->rule_id) 1565 #define nft_trans_rule_bound(trans) \ 1566 (((struct nft_trans_rule *)trans->data)->bound) 1567 1568 struct nft_trans_set { 1569 struct nft_set *set; 1570 u32 set_id; 1571 u32 gc_int; 1572 u64 timeout; 1573 bool update; 1574 bool bound; 1575 u32 size; 1576 }; 1577 1578 #define nft_trans_set(trans) \ 1579 (((struct nft_trans_set *)trans->data)->set) 1580 #define nft_trans_set_id(trans) \ 1581 (((struct nft_trans_set *)trans->data)->set_id) 1582 #define nft_trans_set_bound(trans) \ 1583 (((struct nft_trans_set *)trans->data)->bound) 1584 #define nft_trans_set_update(trans) \ 1585 (((struct nft_trans_set *)trans->data)->update) 1586 #define nft_trans_set_timeout(trans) \ 1587 (((struct nft_trans_set *)trans->data)->timeout) 1588 #define nft_trans_set_gc_int(trans) \ 1589 (((struct nft_trans_set *)trans->data)->gc_int) 1590 #define nft_trans_set_size(trans) \ 1591 (((struct nft_trans_set *)trans->data)->size) 1592 1593 struct nft_trans_chain { 1594 struct nft_chain *chain; 1595 bool update; 1596 char *name; 1597 struct nft_stats __percpu *stats; 1598 u8 policy; 1599 bool bound; 1600 u32 chain_id; 1601 struct nft_base_chain *basechain; 1602 struct list_head hook_list; 1603 }; 1604 1605 #define nft_trans_chain(trans) \ 1606 (((struct nft_trans_chain *)trans->data)->chain) 1607 #define nft_trans_chain_update(trans) \ 1608 (((struct nft_trans_chain *)trans->data)->update) 1609 #define nft_trans_chain_name(trans) \ 1610 (((struct nft_trans_chain *)trans->data)->name) 1611 #define nft_trans_chain_stats(trans) \ 1612 (((struct nft_trans_chain *)trans->data)->stats) 1613 #define nft_trans_chain_policy(trans) \ 1614 (((struct nft_trans_chain *)trans->data)->policy) 1615 #define nft_trans_chain_bound(trans) \ 1616 (((struct nft_trans_chain *)trans->data)->bound) 1617 #define nft_trans_chain_id(trans) \ 1618 (((struct nft_trans_chain *)trans->data)->chain_id) 1619 #define nft_trans_basechain(trans) \ 1620 (((struct nft_trans_chain *)trans->data)->basechain) 1621 #define nft_trans_chain_hooks(trans) \ 1622 (((struct nft_trans_chain *)trans->data)->hook_list) 1623 1624 struct nft_trans_table { 1625 bool update; 1626 }; 1627 1628 #define nft_trans_table_update(trans) \ 1629 (((struct nft_trans_table *)trans->data)->update) 1630 1631 struct nft_trans_elem { 1632 struct nft_set *set; 1633 struct nft_set_elem elem; 1634 bool bound; 1635 }; 1636 1637 #define nft_trans_elem_set(trans) \ 1638 (((struct nft_trans_elem *)trans->data)->set) 1639 #define nft_trans_elem(trans) \ 1640 (((struct nft_trans_elem *)trans->data)->elem) 1641 #define nft_trans_elem_set_bound(trans) \ 1642 (((struct nft_trans_elem *)trans->data)->bound) 1643 1644 struct nft_trans_obj { 1645 struct nft_object *obj; 1646 struct nft_object *newobj; 1647 bool update; 1648 }; 1649 1650 #define nft_trans_obj(trans) \ 1651 (((struct nft_trans_obj *)trans->data)->obj) 1652 #define nft_trans_obj_newobj(trans) \ 1653 (((struct nft_trans_obj *)trans->data)->newobj) 1654 #define nft_trans_obj_update(trans) \ 1655 (((struct nft_trans_obj *)trans->data)->update) 1656 1657 struct nft_trans_flowtable { 1658 struct nft_flowtable *flowtable; 1659 bool update; 1660 struct list_head hook_list; 1661 u32 flags; 1662 }; 1663 1664 #define nft_trans_flowtable(trans) \ 1665 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1666 #define nft_trans_flowtable_update(trans) \ 1667 (((struct nft_trans_flowtable *)trans->data)->update) 1668 #define nft_trans_flowtable_hooks(trans) \ 1669 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1670 #define nft_trans_flowtable_flags(trans) \ 1671 (((struct nft_trans_flowtable *)trans->data)->flags) 1672 1673 #define NFT_TRANS_GC_BATCHCOUNT 256 1674 1675 struct nft_trans_gc { 1676 struct list_head list; 1677 struct net *net; 1678 struct nft_set *set; 1679 u32 seq; 1680 u8 count; 1681 void *priv[NFT_TRANS_GC_BATCHCOUNT]; 1682 struct rcu_head rcu; 1683 }; 1684 1685 struct nft_trans_gc *nft_trans_gc_alloc(struct nft_set *set, 1686 unsigned int gc_seq, gfp_t gfp); 1687 void nft_trans_gc_destroy(struct nft_trans_gc *trans); 1688 1689 struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc, 1690 unsigned int gc_seq, gfp_t gfp); 1691 void nft_trans_gc_queue_async_done(struct nft_trans_gc *gc); 1692 1693 struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp); 1694 void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans); 1695 1696 void nft_trans_gc_elem_add(struct nft_trans_gc *gc, void *priv); 1697 1698 struct nft_trans_gc *nft_trans_gc_catchall(struct nft_trans_gc *gc, 1699 unsigned int gc_seq); 1700 1701 void nft_setelem_data_deactivate(const struct net *net, 1702 const struct nft_set *set, 1703 struct nft_set_elem *elem); 1704 1705 int __init nft_chain_filter_init(void); 1706 void nft_chain_filter_fini(void); 1707 1708 void __init nft_chain_route_init(void); 1709 void nft_chain_route_fini(void); 1710 1711 void nf_tables_trans_destroy_flush_work(void); 1712 1713 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1714 __be64 nf_jiffies64_to_msecs(u64 input); 1715 1716 #ifdef CONFIG_MODULES 1717 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...); 1718 #else 1719 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; } 1720 #endif 1721 1722 struct nftables_pernet { 1723 struct list_head tables; 1724 struct list_head commit_list; 1725 struct list_head binding_list; 1726 struct list_head module_list; 1727 struct list_head notify_list; 1728 struct mutex commit_mutex; 1729 u64 table_handle; 1730 unsigned int base_seq; 1731 unsigned int gc_seq; 1732 u8 validate_state; 1733 }; 1734 1735 extern unsigned int nf_tables_net_id; 1736 1737 static inline struct nftables_pernet *nft_pernet(const struct net *net) 1738 { 1739 return net_generic(net, nf_tables_net_id); 1740 } 1741 1742 #define __NFT_REDUCE_READONLY 1UL 1743 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY 1744 1745 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr) 1746 { 1747 return expr->ops->reduce == NFT_REDUCE_READONLY; 1748 } 1749 1750 void nft_reg_track_update(struct nft_regs_track *track, 1751 const struct nft_expr *expr, u8 dreg, u8 len); 1752 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len); 1753 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg); 1754 1755 static inline bool nft_reg_track_cmp(struct nft_regs_track *track, 1756 const struct nft_expr *expr, u8 dreg) 1757 { 1758 return track->regs[dreg].selector && 1759 track->regs[dreg].selector->ops == expr->ops && 1760 track->regs[dreg].num_reg == 0; 1761 } 1762 1763 #endif /* _NET_NF_TABLES_H */ 1764