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_set *set); 476 void (*gc_init)(const struct nft_set *set); 477 478 unsigned int elemsize; 479 }; 480 481 /** 482 * struct nft_set_type - nf_tables set type 483 * 484 * @ops: set ops for this type 485 * @features: features supported by the implementation 486 */ 487 struct nft_set_type { 488 const struct nft_set_ops ops; 489 u32 features; 490 }; 491 #define to_set_type(o) container_of(o, struct nft_set_type, ops) 492 493 struct nft_set_elem_expr { 494 u8 size; 495 unsigned char data[] 496 __attribute__((aligned(__alignof__(struct nft_expr)))); 497 }; 498 499 #define nft_setelem_expr_at(__elem_expr, __offset) \ 500 ((struct nft_expr *)&__elem_expr->data[__offset]) 501 502 #define nft_setelem_expr_foreach(__expr, __elem_expr, __size) \ 503 for (__expr = nft_setelem_expr_at(__elem_expr, 0), __size = 0; \ 504 __size < (__elem_expr)->size; \ 505 __size += (__expr)->ops->size, __expr = ((void *)(__expr)) + (__expr)->ops->size) 506 507 #define NFT_SET_EXPR_MAX 2 508 509 /** 510 * struct nft_set - nf_tables set instance 511 * 512 * @list: table set list node 513 * @bindings: list of set bindings 514 * @table: table this set belongs to 515 * @net: netnamespace this set belongs to 516 * @name: name of the set 517 * @handle: unique handle of the set 518 * @ktype: key type (numeric type defined by userspace, not used in the kernel) 519 * @dtype: data type (verdict or numeric type defined by userspace) 520 * @objtype: object type (see NFT_OBJECT_* definitions) 521 * @size: maximum set size 522 * @field_len: length of each field in concatenation, bytes 523 * @field_count: number of concatenated fields in element 524 * @use: number of rules references to this set 525 * @nelems: number of elements 526 * @ndeact: number of deactivated elements queued for removal 527 * @timeout: default timeout value in jiffies 528 * @gc_int: garbage collection interval in msecs 529 * @policy: set parameterization (see enum nft_set_policies) 530 * @udlen: user data length 531 * @udata: user data 532 * @expr: stateful expression 533 * @ops: set ops 534 * @flags: set flags 535 * @genmask: generation mask 536 * @klen: key length 537 * @dlen: data length 538 * @data: private set data 539 */ 540 struct nft_set { 541 struct list_head list; 542 struct list_head bindings; 543 struct nft_table *table; 544 possible_net_t net; 545 char *name; 546 u64 handle; 547 u32 ktype; 548 u32 dtype; 549 u32 objtype; 550 u32 size; 551 u8 field_len[NFT_REG32_COUNT]; 552 u8 field_count; 553 u32 use; 554 atomic_t nelems; 555 u32 ndeact; 556 u64 timeout; 557 u32 gc_int; 558 u16 policy; 559 u16 udlen; 560 unsigned char *udata; 561 struct list_head pending_update; 562 /* runtime data below here */ 563 const struct nft_set_ops *ops ____cacheline_aligned; 564 u16 flags:14, 565 genmask:2; 566 u8 klen; 567 u8 dlen; 568 u8 num_exprs; 569 struct nft_expr *exprs[NFT_SET_EXPR_MAX]; 570 struct list_head catchall_list; 571 unsigned char data[] 572 __attribute__((aligned(__alignof__(u64)))); 573 }; 574 575 static inline bool nft_set_is_anonymous(const struct nft_set *set) 576 { 577 return set->flags & NFT_SET_ANONYMOUS; 578 } 579 580 static inline void *nft_set_priv(const struct nft_set *set) 581 { 582 return (void *)set->data; 583 } 584 585 static inline struct nft_set *nft_set_container_of(const void *priv) 586 { 587 return (void *)priv - offsetof(struct nft_set, data); 588 } 589 590 struct nft_set *nft_set_lookup_global(const struct net *net, 591 const struct nft_table *table, 592 const struct nlattr *nla_set_name, 593 const struct nlattr *nla_set_id, 594 u8 genmask); 595 596 struct nft_set_ext *nft_set_catchall_lookup(const struct net *net, 597 const struct nft_set *set); 598 void *nft_set_catchall_gc(const struct nft_set *set); 599 600 static inline unsigned long nft_set_gc_interval(const struct nft_set *set) 601 { 602 u32 gc_int = READ_ONCE(set->gc_int); 603 604 return gc_int ? msecs_to_jiffies(gc_int) : HZ; 605 } 606 607 /** 608 * struct nft_set_binding - nf_tables set binding 609 * 610 * @list: set bindings list node 611 * @chain: chain containing the rule bound to the set 612 * @flags: set action flags 613 * 614 * A set binding contains all information necessary for validation 615 * of new elements added to a bound set. 616 */ 617 struct nft_set_binding { 618 struct list_head list; 619 const struct nft_chain *chain; 620 u32 flags; 621 }; 622 623 enum nft_trans_phase; 624 void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set); 625 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set, 626 struct nft_set_binding *binding, 627 enum nft_trans_phase phase); 628 int nf_tables_bind_set(const struct nft_ctx *ctx, struct nft_set *set, 629 struct nft_set_binding *binding); 630 void nf_tables_destroy_set(const struct nft_ctx *ctx, struct nft_set *set); 631 632 /** 633 * enum nft_set_extensions - set extension type IDs 634 * 635 * @NFT_SET_EXT_KEY: element key 636 * @NFT_SET_EXT_KEY_END: upper bound element key, for ranges 637 * @NFT_SET_EXT_DATA: mapping data 638 * @NFT_SET_EXT_FLAGS: element flags 639 * @NFT_SET_EXT_TIMEOUT: element timeout 640 * @NFT_SET_EXT_EXPIRATION: element expiration time 641 * @NFT_SET_EXT_USERDATA: user data associated with the element 642 * @NFT_SET_EXT_EXPRESSIONS: expressions assiciated with the element 643 * @NFT_SET_EXT_OBJREF: stateful object reference associated with element 644 * @NFT_SET_EXT_NUM: number of extension types 645 */ 646 enum nft_set_extensions { 647 NFT_SET_EXT_KEY, 648 NFT_SET_EXT_KEY_END, 649 NFT_SET_EXT_DATA, 650 NFT_SET_EXT_FLAGS, 651 NFT_SET_EXT_TIMEOUT, 652 NFT_SET_EXT_EXPIRATION, 653 NFT_SET_EXT_USERDATA, 654 NFT_SET_EXT_EXPRESSIONS, 655 NFT_SET_EXT_OBJREF, 656 NFT_SET_EXT_NUM 657 }; 658 659 /** 660 * struct nft_set_ext_type - set extension type 661 * 662 * @len: fixed part length of the extension 663 * @align: alignment requirements of the extension 664 */ 665 struct nft_set_ext_type { 666 u8 len; 667 u8 align; 668 }; 669 670 extern const struct nft_set_ext_type nft_set_ext_types[]; 671 672 /** 673 * struct nft_set_ext_tmpl - set extension template 674 * 675 * @len: length of extension area 676 * @offset: offsets of individual extension types 677 */ 678 struct nft_set_ext_tmpl { 679 u16 len; 680 u8 offset[NFT_SET_EXT_NUM]; 681 u8 ext_len[NFT_SET_EXT_NUM]; 682 }; 683 684 /** 685 * struct nft_set_ext - set extensions 686 * 687 * @genmask: generation mask 688 * @offset: offsets of individual extension types 689 * @data: beginning of extension data 690 */ 691 struct nft_set_ext { 692 u8 genmask; 693 u8 offset[NFT_SET_EXT_NUM]; 694 char data[]; 695 }; 696 697 static inline void nft_set_ext_prepare(struct nft_set_ext_tmpl *tmpl) 698 { 699 memset(tmpl, 0, sizeof(*tmpl)); 700 tmpl->len = sizeof(struct nft_set_ext); 701 } 702 703 static inline int nft_set_ext_add_length(struct nft_set_ext_tmpl *tmpl, u8 id, 704 unsigned int len) 705 { 706 tmpl->len = ALIGN(tmpl->len, nft_set_ext_types[id].align); 707 if (tmpl->len > U8_MAX) 708 return -EINVAL; 709 710 tmpl->offset[id] = tmpl->len; 711 tmpl->ext_len[id] = nft_set_ext_types[id].len + len; 712 tmpl->len += tmpl->ext_len[id]; 713 714 return 0; 715 } 716 717 static inline int nft_set_ext_add(struct nft_set_ext_tmpl *tmpl, u8 id) 718 { 719 return nft_set_ext_add_length(tmpl, id, 0); 720 } 721 722 static inline void nft_set_ext_init(struct nft_set_ext *ext, 723 const struct nft_set_ext_tmpl *tmpl) 724 { 725 memcpy(ext->offset, tmpl->offset, sizeof(ext->offset)); 726 } 727 728 static inline bool __nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 729 { 730 return !!ext->offset[id]; 731 } 732 733 static inline bool nft_set_ext_exists(const struct nft_set_ext *ext, u8 id) 734 { 735 return ext && __nft_set_ext_exists(ext, id); 736 } 737 738 static inline void *nft_set_ext(const struct nft_set_ext *ext, u8 id) 739 { 740 return (void *)ext + ext->offset[id]; 741 } 742 743 static inline struct nft_data *nft_set_ext_key(const struct nft_set_ext *ext) 744 { 745 return nft_set_ext(ext, NFT_SET_EXT_KEY); 746 } 747 748 static inline struct nft_data *nft_set_ext_key_end(const struct nft_set_ext *ext) 749 { 750 return nft_set_ext(ext, NFT_SET_EXT_KEY_END); 751 } 752 753 static inline struct nft_data *nft_set_ext_data(const struct nft_set_ext *ext) 754 { 755 return nft_set_ext(ext, NFT_SET_EXT_DATA); 756 } 757 758 static inline u8 *nft_set_ext_flags(const struct nft_set_ext *ext) 759 { 760 return nft_set_ext(ext, NFT_SET_EXT_FLAGS); 761 } 762 763 static inline u64 *nft_set_ext_timeout(const struct nft_set_ext *ext) 764 { 765 return nft_set_ext(ext, NFT_SET_EXT_TIMEOUT); 766 } 767 768 static inline u64 *nft_set_ext_expiration(const struct nft_set_ext *ext) 769 { 770 return nft_set_ext(ext, NFT_SET_EXT_EXPIRATION); 771 } 772 773 static inline struct nft_userdata *nft_set_ext_userdata(const struct nft_set_ext *ext) 774 { 775 return nft_set_ext(ext, NFT_SET_EXT_USERDATA); 776 } 777 778 static inline struct nft_set_elem_expr *nft_set_ext_expr(const struct nft_set_ext *ext) 779 { 780 return nft_set_ext(ext, NFT_SET_EXT_EXPRESSIONS); 781 } 782 783 static inline bool nft_set_elem_expired(const struct nft_set_ext *ext) 784 { 785 return nft_set_ext_exists(ext, NFT_SET_EXT_EXPIRATION) && 786 time_is_before_eq_jiffies64(*nft_set_ext_expiration(ext)); 787 } 788 789 static inline struct nft_set_ext *nft_set_elem_ext(const struct nft_set *set, 790 void *elem) 791 { 792 return elem + set->ops->elemsize; 793 } 794 795 static inline struct nft_object **nft_set_ext_obj(const struct nft_set_ext *ext) 796 { 797 return nft_set_ext(ext, NFT_SET_EXT_OBJREF); 798 } 799 800 struct nft_expr *nft_set_elem_expr_alloc(const struct nft_ctx *ctx, 801 const struct nft_set *set, 802 const struct nlattr *attr); 803 804 void *nft_set_elem_init(const struct nft_set *set, 805 const struct nft_set_ext_tmpl *tmpl, 806 const u32 *key, const u32 *key_end, const u32 *data, 807 u64 timeout, u64 expiration, gfp_t gfp); 808 int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, 809 struct nft_expr *expr_array[]); 810 void nft_set_elem_destroy(const struct nft_set *set, void *elem, 811 bool destroy_expr); 812 813 /** 814 * struct nft_set_gc_batch_head - nf_tables set garbage collection batch 815 * 816 * @rcu: rcu head 817 * @set: set the elements belong to 818 * @cnt: count of elements 819 */ 820 struct nft_set_gc_batch_head { 821 struct rcu_head rcu; 822 const struct nft_set *set; 823 unsigned int cnt; 824 }; 825 826 #define NFT_SET_GC_BATCH_SIZE ((PAGE_SIZE - \ 827 sizeof(struct nft_set_gc_batch_head)) / \ 828 sizeof(void *)) 829 830 /** 831 * struct nft_set_gc_batch - nf_tables set garbage collection batch 832 * 833 * @head: GC batch head 834 * @elems: garbage collection elements 835 */ 836 struct nft_set_gc_batch { 837 struct nft_set_gc_batch_head head; 838 void *elems[NFT_SET_GC_BATCH_SIZE]; 839 }; 840 841 struct nft_set_gc_batch *nft_set_gc_batch_alloc(const struct nft_set *set, 842 gfp_t gfp); 843 void nft_set_gc_batch_release(struct rcu_head *rcu); 844 845 static inline void nft_set_gc_batch_complete(struct nft_set_gc_batch *gcb) 846 { 847 if (gcb != NULL) 848 call_rcu(&gcb->head.rcu, nft_set_gc_batch_release); 849 } 850 851 static inline struct nft_set_gc_batch * 852 nft_set_gc_batch_check(const struct nft_set *set, struct nft_set_gc_batch *gcb, 853 gfp_t gfp) 854 { 855 if (gcb != NULL) { 856 if (gcb->head.cnt + 1 < ARRAY_SIZE(gcb->elems)) 857 return gcb; 858 nft_set_gc_batch_complete(gcb); 859 } 860 return nft_set_gc_batch_alloc(set, gfp); 861 } 862 863 static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb, 864 void *elem) 865 { 866 gcb->elems[gcb->head.cnt++] = elem; 867 } 868 869 struct nft_expr_ops; 870 /** 871 * struct nft_expr_type - nf_tables expression type 872 * 873 * @select_ops: function to select nft_expr_ops 874 * @release_ops: release nft_expr_ops 875 * @ops: default ops, used when no select_ops functions is present 876 * @list: used internally 877 * @name: Identifier 878 * @owner: module reference 879 * @policy: netlink attribute policy 880 * @maxattr: highest netlink attribute number 881 * @family: address family for AF-specific types 882 * @flags: expression type flags 883 */ 884 struct nft_expr_type { 885 const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *, 886 const struct nlattr * const tb[]); 887 void (*release_ops)(const struct nft_expr_ops *ops); 888 const struct nft_expr_ops *ops; 889 const struct nft_expr_ops *inner_ops; 890 struct list_head list; 891 const char *name; 892 struct module *owner; 893 const struct nla_policy *policy; 894 unsigned int maxattr; 895 u8 family; 896 u8 flags; 897 }; 898 899 #define NFT_EXPR_STATEFUL 0x1 900 #define NFT_EXPR_GC 0x2 901 902 enum nft_trans_phase { 903 NFT_TRANS_PREPARE, 904 NFT_TRANS_PREPARE_ERROR, 905 NFT_TRANS_ABORT, 906 NFT_TRANS_COMMIT, 907 NFT_TRANS_RELEASE 908 }; 909 910 struct nft_flow_rule; 911 struct nft_offload_ctx; 912 913 /** 914 * struct nft_expr_ops - nf_tables expression operations 915 * 916 * @eval: Expression evaluation function 917 * @size: full expression size, including private data size 918 * @init: initialization function 919 * @activate: activate expression in the next generation 920 * @deactivate: deactivate expression in next generation 921 * @destroy: destruction function, called after synchronize_rcu 922 * @dump: function to dump parameters 923 * @type: expression type 924 * @validate: validate expression, called during loop detection 925 * @data: extra data to attach to this expression operation 926 */ 927 struct nft_expr_ops { 928 void (*eval)(const struct nft_expr *expr, 929 struct nft_regs *regs, 930 const struct nft_pktinfo *pkt); 931 int (*clone)(struct nft_expr *dst, 932 const struct nft_expr *src); 933 unsigned int size; 934 935 int (*init)(const struct nft_ctx *ctx, 936 const struct nft_expr *expr, 937 const struct nlattr * const tb[]); 938 void (*activate)(const struct nft_ctx *ctx, 939 const struct nft_expr *expr); 940 void (*deactivate)(const struct nft_ctx *ctx, 941 const struct nft_expr *expr, 942 enum nft_trans_phase phase); 943 void (*destroy)(const struct nft_ctx *ctx, 944 const struct nft_expr *expr); 945 void (*destroy_clone)(const struct nft_ctx *ctx, 946 const struct nft_expr *expr); 947 int (*dump)(struct sk_buff *skb, 948 const struct nft_expr *expr, 949 bool reset); 950 int (*validate)(const struct nft_ctx *ctx, 951 const struct nft_expr *expr, 952 const struct nft_data **data); 953 bool (*reduce)(struct nft_regs_track *track, 954 const struct nft_expr *expr); 955 bool (*gc)(struct net *net, 956 const struct nft_expr *expr); 957 int (*offload)(struct nft_offload_ctx *ctx, 958 struct nft_flow_rule *flow, 959 const struct nft_expr *expr); 960 bool (*offload_action)(const struct nft_expr *expr); 961 void (*offload_stats)(struct nft_expr *expr, 962 const struct flow_stats *stats); 963 const struct nft_expr_type *type; 964 void *data; 965 }; 966 967 /** 968 * struct nft_rule - nf_tables rule 969 * 970 * @list: used internally 971 * @handle: rule handle 972 * @genmask: generation mask 973 * @dlen: length of expression data 974 * @udata: user data is appended to the rule 975 * @data: expression data 976 */ 977 struct nft_rule { 978 struct list_head list; 979 u64 handle:42, 980 genmask:2, 981 dlen:12, 982 udata:1; 983 unsigned char data[] 984 __attribute__((aligned(__alignof__(struct nft_expr)))); 985 }; 986 987 static inline struct nft_expr *nft_expr_first(const struct nft_rule *rule) 988 { 989 return (struct nft_expr *)&rule->data[0]; 990 } 991 992 static inline struct nft_expr *nft_expr_next(const struct nft_expr *expr) 993 { 994 return ((void *)expr) + expr->ops->size; 995 } 996 997 static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) 998 { 999 return (struct nft_expr *)&rule->data[rule->dlen]; 1000 } 1001 1002 static inline bool nft_expr_more(const struct nft_rule *rule, 1003 const struct nft_expr *expr) 1004 { 1005 return expr != nft_expr_last(rule) && expr->ops; 1006 } 1007 1008 static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule) 1009 { 1010 return (void *)&rule->data[rule->dlen]; 1011 } 1012 1013 void nft_rule_expr_activate(const struct nft_ctx *ctx, struct nft_rule *rule); 1014 void nft_rule_expr_deactivate(const struct nft_ctx *ctx, struct nft_rule *rule, 1015 enum nft_trans_phase phase); 1016 void nf_tables_rule_destroy(const struct nft_ctx *ctx, struct nft_rule *rule); 1017 1018 static inline void nft_set_elem_update_expr(const struct nft_set_ext *ext, 1019 struct nft_regs *regs, 1020 const struct nft_pktinfo *pkt) 1021 { 1022 struct nft_set_elem_expr *elem_expr; 1023 struct nft_expr *expr; 1024 u32 size; 1025 1026 if (__nft_set_ext_exists(ext, NFT_SET_EXT_EXPRESSIONS)) { 1027 elem_expr = nft_set_ext_expr(ext); 1028 nft_setelem_expr_foreach(expr, elem_expr, size) { 1029 expr->ops->eval(expr, regs, pkt); 1030 if (regs->verdict.code == NFT_BREAK) 1031 return; 1032 } 1033 } 1034 } 1035 1036 /* 1037 * The last pointer isn't really necessary, but the compiler isn't able to 1038 * determine that the result of nft_expr_last() is always the same since it 1039 * can't assume that the dlen value wasn't changed within calls in the loop. 1040 */ 1041 #define nft_rule_for_each_expr(expr, last, rule) \ 1042 for ((expr) = nft_expr_first(rule), (last) = nft_expr_last(rule); \ 1043 (expr) != (last); \ 1044 (expr) = nft_expr_next(expr)) 1045 1046 #define NFT_CHAIN_POLICY_UNSET U8_MAX 1047 1048 struct nft_rule_dp { 1049 u64 is_last:1, 1050 dlen:12, 1051 handle:42; /* for tracing */ 1052 unsigned char data[] 1053 __attribute__((aligned(__alignof__(struct nft_expr)))); 1054 }; 1055 1056 struct nft_rule_dp_last { 1057 struct nft_rule_dp end; /* end of nft_rule_blob marker */ 1058 struct rcu_head h; /* call_rcu head */ 1059 struct nft_rule_blob *blob; /* ptr to free via call_rcu */ 1060 const struct nft_chain *chain; /* for nftables tracing */ 1061 }; 1062 1063 static inline const struct nft_rule_dp *nft_rule_next(const struct nft_rule_dp *rule) 1064 { 1065 return (void *)rule + sizeof(*rule) + rule->dlen; 1066 } 1067 1068 struct nft_rule_blob { 1069 unsigned long size; 1070 unsigned char data[] 1071 __attribute__((aligned(__alignof__(struct nft_rule_dp)))); 1072 }; 1073 1074 /** 1075 * struct nft_chain - nf_tables chain 1076 * 1077 * @rules: list of rules in the chain 1078 * @list: used internally 1079 * @rhlhead: used internally 1080 * @table: table that this chain belongs to 1081 * @handle: chain handle 1082 * @use: number of jump references to this chain 1083 * @flags: bitmask of enum nft_chain_flags 1084 * @name: name of the chain 1085 */ 1086 struct nft_chain { 1087 struct nft_rule_blob __rcu *blob_gen_0; 1088 struct nft_rule_blob __rcu *blob_gen_1; 1089 struct list_head rules; 1090 struct list_head list; 1091 struct rhlist_head rhlhead; 1092 struct nft_table *table; 1093 u64 handle; 1094 u32 use; 1095 u8 flags:5, 1096 bound:1, 1097 genmask:2; 1098 char *name; 1099 u16 udlen; 1100 u8 *udata; 1101 1102 /* Only used during control plane commit phase: */ 1103 struct nft_rule_blob *blob_next; 1104 }; 1105 1106 int nft_chain_validate(const struct nft_ctx *ctx, const struct nft_chain *chain); 1107 int nft_setelem_validate(const struct nft_ctx *ctx, struct nft_set *set, 1108 const struct nft_set_iter *iter, 1109 struct nft_set_elem *elem); 1110 int nft_set_catchall_validate(const struct nft_ctx *ctx, struct nft_set *set); 1111 int nf_tables_bind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1112 void nf_tables_unbind_chain(const struct nft_ctx *ctx, struct nft_chain *chain); 1113 1114 enum nft_chain_types { 1115 NFT_CHAIN_T_DEFAULT = 0, 1116 NFT_CHAIN_T_ROUTE, 1117 NFT_CHAIN_T_NAT, 1118 NFT_CHAIN_T_MAX 1119 }; 1120 1121 /** 1122 * struct nft_chain_type - nf_tables chain type info 1123 * 1124 * @name: name of the type 1125 * @type: numeric identifier 1126 * @family: address family 1127 * @owner: module owner 1128 * @hook_mask: mask of valid hooks 1129 * @hooks: array of hook functions 1130 * @ops_register: base chain register function 1131 * @ops_unregister: base chain unregister function 1132 */ 1133 struct nft_chain_type { 1134 const char *name; 1135 enum nft_chain_types type; 1136 int family; 1137 struct module *owner; 1138 unsigned int hook_mask; 1139 nf_hookfn *hooks[NFT_MAX_HOOKS]; 1140 int (*ops_register)(struct net *net, const struct nf_hook_ops *ops); 1141 void (*ops_unregister)(struct net *net, const struct nf_hook_ops *ops); 1142 }; 1143 1144 int nft_chain_validate_dependency(const struct nft_chain *chain, 1145 enum nft_chain_types type); 1146 int nft_chain_validate_hooks(const struct nft_chain *chain, 1147 unsigned int hook_flags); 1148 1149 static inline bool nft_chain_binding(const struct nft_chain *chain) 1150 { 1151 return chain->flags & NFT_CHAIN_BINDING; 1152 } 1153 1154 static inline bool nft_chain_is_bound(struct nft_chain *chain) 1155 { 1156 return (chain->flags & NFT_CHAIN_BINDING) && chain->bound; 1157 } 1158 1159 int nft_chain_add(struct nft_table *table, struct nft_chain *chain); 1160 void nft_chain_del(struct nft_chain *chain); 1161 void nf_tables_chain_destroy(struct nft_ctx *ctx); 1162 1163 struct nft_stats { 1164 u64 bytes; 1165 u64 pkts; 1166 struct u64_stats_sync syncp; 1167 }; 1168 1169 struct nft_hook { 1170 struct list_head list; 1171 struct nf_hook_ops ops; 1172 struct rcu_head rcu; 1173 }; 1174 1175 /** 1176 * struct nft_base_chain - nf_tables base chain 1177 * 1178 * @ops: netfilter hook ops 1179 * @hook_list: list of netfilter hooks (for NFPROTO_NETDEV family) 1180 * @type: chain type 1181 * @policy: default policy 1182 * @stats: per-cpu chain stats 1183 * @chain: the chain 1184 * @flow_block: flow block (for hardware offload) 1185 */ 1186 struct nft_base_chain { 1187 struct nf_hook_ops ops; 1188 struct list_head hook_list; 1189 const struct nft_chain_type *type; 1190 u8 policy; 1191 u8 flags; 1192 struct nft_stats __percpu *stats; 1193 struct nft_chain chain; 1194 struct flow_block flow_block; 1195 }; 1196 1197 static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain) 1198 { 1199 return container_of(chain, struct nft_base_chain, chain); 1200 } 1201 1202 static inline bool nft_is_base_chain(const struct nft_chain *chain) 1203 { 1204 return chain->flags & NFT_CHAIN_BASE; 1205 } 1206 1207 int __nft_release_basechain(struct nft_ctx *ctx); 1208 1209 unsigned int nft_do_chain(struct nft_pktinfo *pkt, void *priv); 1210 1211 /** 1212 * struct nft_table - nf_tables table 1213 * 1214 * @list: used internally 1215 * @chains_ht: chains in the table 1216 * @chains: same, for stable walks 1217 * @sets: sets in the table 1218 * @objects: stateful objects in the table 1219 * @flowtables: flow tables in the table 1220 * @hgenerator: handle generator state 1221 * @handle: table handle 1222 * @use: number of chain references to this table 1223 * @flags: table flag (see enum nft_table_flags) 1224 * @genmask: generation mask 1225 * @afinfo: address family info 1226 * @name: name of the table 1227 * @validate_state: internal, set when transaction adds jumps 1228 */ 1229 struct nft_table { 1230 struct list_head list; 1231 struct rhltable chains_ht; 1232 struct list_head chains; 1233 struct list_head sets; 1234 struct list_head objects; 1235 struct list_head flowtables; 1236 u64 hgenerator; 1237 u64 handle; 1238 u32 use; 1239 u16 family:6, 1240 flags:8, 1241 genmask:2; 1242 u32 nlpid; 1243 char *name; 1244 u16 udlen; 1245 u8 *udata; 1246 u8 validate_state; 1247 }; 1248 1249 static inline bool nft_table_has_owner(const struct nft_table *table) 1250 { 1251 return table->flags & NFT_TABLE_F_OWNER; 1252 } 1253 1254 static inline bool nft_base_chain_netdev(int family, u32 hooknum) 1255 { 1256 return family == NFPROTO_NETDEV || 1257 (family == NFPROTO_INET && hooknum == NF_INET_INGRESS); 1258 } 1259 1260 void nft_register_chain_type(const struct nft_chain_type *); 1261 void nft_unregister_chain_type(const struct nft_chain_type *); 1262 1263 int nft_register_expr(struct nft_expr_type *); 1264 void nft_unregister_expr(struct nft_expr_type *); 1265 1266 int nft_verdict_dump(struct sk_buff *skb, int type, 1267 const struct nft_verdict *v); 1268 1269 /** 1270 * struct nft_object_hash_key - key to lookup nft_object 1271 * 1272 * @name: name of the stateful object to look up 1273 * @table: table the object belongs to 1274 */ 1275 struct nft_object_hash_key { 1276 const char *name; 1277 const struct nft_table *table; 1278 }; 1279 1280 /** 1281 * struct nft_object - nf_tables stateful object 1282 * 1283 * @list: table stateful object list node 1284 * @key: keys that identify this object 1285 * @rhlhead: nft_objname_ht node 1286 * @genmask: generation mask 1287 * @use: number of references to this stateful object 1288 * @handle: unique object handle 1289 * @ops: object operations 1290 * @data: object data, layout depends on type 1291 */ 1292 struct nft_object { 1293 struct list_head list; 1294 struct rhlist_head rhlhead; 1295 struct nft_object_hash_key key; 1296 u32 genmask:2, 1297 use:30; 1298 u64 handle; 1299 u16 udlen; 1300 u8 *udata; 1301 /* runtime data below here */ 1302 const struct nft_object_ops *ops ____cacheline_aligned; 1303 unsigned char data[] 1304 __attribute__((aligned(__alignof__(u64)))); 1305 }; 1306 1307 static inline void *nft_obj_data(const struct nft_object *obj) 1308 { 1309 return (void *)obj->data; 1310 } 1311 1312 #define nft_expr_obj(expr) *((struct nft_object **)nft_expr_priv(expr)) 1313 1314 struct nft_object *nft_obj_lookup(const struct net *net, 1315 const struct nft_table *table, 1316 const struct nlattr *nla, u32 objtype, 1317 u8 genmask); 1318 1319 void nft_obj_notify(struct net *net, const struct nft_table *table, 1320 struct nft_object *obj, u32 portid, u32 seq, 1321 int event, u16 flags, int family, int report, gfp_t gfp); 1322 1323 /** 1324 * struct nft_object_type - stateful object type 1325 * 1326 * @select_ops: function to select nft_object_ops 1327 * @ops: default ops, used when no select_ops functions is present 1328 * @list: list node in list of object types 1329 * @type: stateful object numeric type 1330 * @owner: module owner 1331 * @maxattr: maximum netlink attribute 1332 * @policy: netlink attribute policy 1333 */ 1334 struct nft_object_type { 1335 const struct nft_object_ops *(*select_ops)(const struct nft_ctx *, 1336 const struct nlattr * const tb[]); 1337 const struct nft_object_ops *ops; 1338 struct list_head list; 1339 u32 type; 1340 unsigned int maxattr; 1341 struct module *owner; 1342 const struct nla_policy *policy; 1343 }; 1344 1345 /** 1346 * struct nft_object_ops - stateful object operations 1347 * 1348 * @eval: stateful object evaluation function 1349 * @size: stateful object size 1350 * @init: initialize object from netlink attributes 1351 * @destroy: release existing stateful object 1352 * @dump: netlink dump stateful object 1353 * @update: update stateful object 1354 */ 1355 struct nft_object_ops { 1356 void (*eval)(struct nft_object *obj, 1357 struct nft_regs *regs, 1358 const struct nft_pktinfo *pkt); 1359 unsigned int size; 1360 int (*init)(const struct nft_ctx *ctx, 1361 const struct nlattr *const tb[], 1362 struct nft_object *obj); 1363 void (*destroy)(const struct nft_ctx *ctx, 1364 struct nft_object *obj); 1365 int (*dump)(struct sk_buff *skb, 1366 struct nft_object *obj, 1367 bool reset); 1368 void (*update)(struct nft_object *obj, 1369 struct nft_object *newobj); 1370 const struct nft_object_type *type; 1371 }; 1372 1373 int nft_register_obj(struct nft_object_type *obj_type); 1374 void nft_unregister_obj(struct nft_object_type *obj_type); 1375 1376 #define NFT_NETDEVICE_MAX 256 1377 1378 /** 1379 * struct nft_flowtable - nf_tables flow table 1380 * 1381 * @list: flow table list node in table list 1382 * @table: the table the flow table is contained in 1383 * @name: name of this flow table 1384 * @hooknum: hook number 1385 * @ops_len: number of hooks in array 1386 * @genmask: generation mask 1387 * @use: number of references to this flow table 1388 * @handle: unique object handle 1389 * @dev_name: array of device names 1390 * @data: rhashtable and garbage collector 1391 * @ops: array of hooks 1392 */ 1393 struct nft_flowtable { 1394 struct list_head list; 1395 struct nft_table *table; 1396 char *name; 1397 int hooknum; 1398 int ops_len; 1399 u32 genmask:2, 1400 use:30; 1401 u64 handle; 1402 /* runtime data below here */ 1403 struct list_head hook_list ____cacheline_aligned; 1404 struct nf_flowtable data; 1405 }; 1406 1407 struct nft_flowtable *nft_flowtable_lookup(const struct nft_table *table, 1408 const struct nlattr *nla, 1409 u8 genmask); 1410 1411 void nf_tables_deactivate_flowtable(const struct nft_ctx *ctx, 1412 struct nft_flowtable *flowtable, 1413 enum nft_trans_phase phase); 1414 1415 void nft_register_flowtable_type(struct nf_flowtable_type *type); 1416 void nft_unregister_flowtable_type(struct nf_flowtable_type *type); 1417 1418 /** 1419 * struct nft_traceinfo - nft tracing information and state 1420 * 1421 * @trace: other struct members are initialised 1422 * @nf_trace: copy of skb->nf_trace before rule evaluation 1423 * @type: event type (enum nft_trace_types) 1424 * @skbid: hash of skb to be used as trace id 1425 * @packet_dumped: packet headers sent in a previous traceinfo message 1426 * @basechain: base chain currently processed 1427 */ 1428 struct nft_traceinfo { 1429 bool trace; 1430 bool nf_trace; 1431 bool packet_dumped; 1432 enum nft_trace_types type:8; 1433 u32 skbid; 1434 const struct nft_base_chain *basechain; 1435 }; 1436 1437 void nft_trace_init(struct nft_traceinfo *info, const struct nft_pktinfo *pkt, 1438 const struct nft_chain *basechain); 1439 1440 void nft_trace_notify(const struct nft_pktinfo *pkt, 1441 const struct nft_verdict *verdict, 1442 const struct nft_rule_dp *rule, 1443 struct nft_traceinfo *info); 1444 1445 #define MODULE_ALIAS_NFT_CHAIN(family, name) \ 1446 MODULE_ALIAS("nft-chain-" __stringify(family) "-" name) 1447 1448 #define MODULE_ALIAS_NFT_AF_EXPR(family, name) \ 1449 MODULE_ALIAS("nft-expr-" __stringify(family) "-" name) 1450 1451 #define MODULE_ALIAS_NFT_EXPR(name) \ 1452 MODULE_ALIAS("nft-expr-" name) 1453 1454 #define MODULE_ALIAS_NFT_OBJ(type) \ 1455 MODULE_ALIAS("nft-obj-" __stringify(type)) 1456 1457 #if IS_ENABLED(CONFIG_NF_TABLES) 1458 1459 /* 1460 * The gencursor defines two generations, the currently active and the 1461 * next one. Objects contain a bitmask of 2 bits specifying the generations 1462 * they're active in. A set bit means they're inactive in the generation 1463 * represented by that bit. 1464 * 1465 * New objects start out as inactive in the current and active in the 1466 * next generation. When committing the ruleset the bitmask is cleared, 1467 * meaning they're active in all generations. When removing an object, 1468 * it is set inactive in the next generation. After committing the ruleset, 1469 * the objects are removed. 1470 */ 1471 static inline unsigned int nft_gencursor_next(const struct net *net) 1472 { 1473 return net->nft.gencursor + 1 == 1 ? 1 : 0; 1474 } 1475 1476 static inline u8 nft_genmask_next(const struct net *net) 1477 { 1478 return 1 << nft_gencursor_next(net); 1479 } 1480 1481 static inline u8 nft_genmask_cur(const struct net *net) 1482 { 1483 /* Use READ_ONCE() to prevent refetching the value for atomicity */ 1484 return 1 << READ_ONCE(net->nft.gencursor); 1485 } 1486 1487 #define NFT_GENMASK_ANY ((1 << 0) | (1 << 1)) 1488 1489 /* 1490 * Generic transaction helpers 1491 */ 1492 1493 /* Check if this object is currently active. */ 1494 #define nft_is_active(__net, __obj) \ 1495 (((__obj)->genmask & nft_genmask_cur(__net)) == 0) 1496 1497 /* Check if this object is active in the next generation. */ 1498 #define nft_is_active_next(__net, __obj) \ 1499 (((__obj)->genmask & nft_genmask_next(__net)) == 0) 1500 1501 /* This object becomes active in the next generation. */ 1502 #define nft_activate_next(__net, __obj) \ 1503 (__obj)->genmask = nft_genmask_cur(__net) 1504 1505 /* This object becomes inactive in the next generation. */ 1506 #define nft_deactivate_next(__net, __obj) \ 1507 (__obj)->genmask = nft_genmask_next(__net) 1508 1509 /* After committing the ruleset, clear the stale generation bit. */ 1510 #define nft_clear(__net, __obj) \ 1511 (__obj)->genmask &= ~nft_genmask_next(__net) 1512 #define nft_active_genmask(__obj, __genmask) \ 1513 !((__obj)->genmask & __genmask) 1514 1515 /* 1516 * Set element transaction helpers 1517 */ 1518 1519 static inline bool nft_set_elem_active(const struct nft_set_ext *ext, 1520 u8 genmask) 1521 { 1522 return !(ext->genmask & genmask); 1523 } 1524 1525 static inline void nft_set_elem_change_active(const struct net *net, 1526 const struct nft_set *set, 1527 struct nft_set_ext *ext) 1528 { 1529 ext->genmask ^= nft_genmask_next(net); 1530 } 1531 1532 #endif /* IS_ENABLED(CONFIG_NF_TABLES) */ 1533 1534 /* 1535 * We use a free bit in the genmask field to indicate the element 1536 * is busy, meaning it is currently being processed either by 1537 * the netlink API or GC. 1538 * 1539 * Even though the genmask is only a single byte wide, this works 1540 * because the extension structure if fully constant once initialized, 1541 * so there are no non-atomic write accesses unless it is already 1542 * marked busy. 1543 */ 1544 #define NFT_SET_ELEM_BUSY_MASK (1 << 2) 1545 1546 #if defined(__LITTLE_ENDIAN_BITFIELD) 1547 #define NFT_SET_ELEM_BUSY_BIT 2 1548 #elif defined(__BIG_ENDIAN_BITFIELD) 1549 #define NFT_SET_ELEM_BUSY_BIT (BITS_PER_LONG - BITS_PER_BYTE + 2) 1550 #else 1551 #error 1552 #endif 1553 1554 static inline int nft_set_elem_mark_busy(struct nft_set_ext *ext) 1555 { 1556 unsigned long *word = (unsigned long *)ext; 1557 1558 BUILD_BUG_ON(offsetof(struct nft_set_ext, genmask) != 0); 1559 return test_and_set_bit(NFT_SET_ELEM_BUSY_BIT, word); 1560 } 1561 1562 static inline void nft_set_elem_clear_busy(struct nft_set_ext *ext) 1563 { 1564 unsigned long *word = (unsigned long *)ext; 1565 1566 clear_bit(NFT_SET_ELEM_BUSY_BIT, word); 1567 } 1568 1569 /** 1570 * struct nft_trans - nf_tables object update in transaction 1571 * 1572 * @list: used internally 1573 * @msg_type: message type 1574 * @put_net: ctx->net needs to be put 1575 * @ctx: transaction context 1576 * @data: internal information related to the transaction 1577 */ 1578 struct nft_trans { 1579 struct list_head list; 1580 int msg_type; 1581 bool put_net; 1582 struct nft_ctx ctx; 1583 char data[]; 1584 }; 1585 1586 struct nft_trans_rule { 1587 struct nft_rule *rule; 1588 struct nft_flow_rule *flow; 1589 u32 rule_id; 1590 bool bound; 1591 }; 1592 1593 #define nft_trans_rule(trans) \ 1594 (((struct nft_trans_rule *)trans->data)->rule) 1595 #define nft_trans_flow_rule(trans) \ 1596 (((struct nft_trans_rule *)trans->data)->flow) 1597 #define nft_trans_rule_id(trans) \ 1598 (((struct nft_trans_rule *)trans->data)->rule_id) 1599 #define nft_trans_rule_bound(trans) \ 1600 (((struct nft_trans_rule *)trans->data)->bound) 1601 1602 struct nft_trans_set { 1603 struct nft_set *set; 1604 u32 set_id; 1605 u32 gc_int; 1606 u64 timeout; 1607 bool update; 1608 bool bound; 1609 }; 1610 1611 #define nft_trans_set(trans) \ 1612 (((struct nft_trans_set *)trans->data)->set) 1613 #define nft_trans_set_id(trans) \ 1614 (((struct nft_trans_set *)trans->data)->set_id) 1615 #define nft_trans_set_bound(trans) \ 1616 (((struct nft_trans_set *)trans->data)->bound) 1617 #define nft_trans_set_update(trans) \ 1618 (((struct nft_trans_set *)trans->data)->update) 1619 #define nft_trans_set_timeout(trans) \ 1620 (((struct nft_trans_set *)trans->data)->timeout) 1621 #define nft_trans_set_gc_int(trans) \ 1622 (((struct nft_trans_set *)trans->data)->gc_int) 1623 1624 struct nft_trans_chain { 1625 struct nft_chain *chain; 1626 bool update; 1627 char *name; 1628 struct nft_stats __percpu *stats; 1629 u8 policy; 1630 bool bound; 1631 u32 chain_id; 1632 struct nft_base_chain *basechain; 1633 struct list_head hook_list; 1634 }; 1635 1636 #define nft_trans_chain(trans) \ 1637 (((struct nft_trans_chain *)trans->data)->chain) 1638 #define nft_trans_chain_update(trans) \ 1639 (((struct nft_trans_chain *)trans->data)->update) 1640 #define nft_trans_chain_name(trans) \ 1641 (((struct nft_trans_chain *)trans->data)->name) 1642 #define nft_trans_chain_stats(trans) \ 1643 (((struct nft_trans_chain *)trans->data)->stats) 1644 #define nft_trans_chain_policy(trans) \ 1645 (((struct nft_trans_chain *)trans->data)->policy) 1646 #define nft_trans_chain_bound(trans) \ 1647 (((struct nft_trans_chain *)trans->data)->bound) 1648 #define nft_trans_chain_id(trans) \ 1649 (((struct nft_trans_chain *)trans->data)->chain_id) 1650 #define nft_trans_basechain(trans) \ 1651 (((struct nft_trans_chain *)trans->data)->basechain) 1652 #define nft_trans_chain_hooks(trans) \ 1653 (((struct nft_trans_chain *)trans->data)->hook_list) 1654 1655 struct nft_trans_table { 1656 bool update; 1657 }; 1658 1659 #define nft_trans_table_update(trans) \ 1660 (((struct nft_trans_table *)trans->data)->update) 1661 1662 struct nft_trans_elem { 1663 struct nft_set *set; 1664 struct nft_set_elem elem; 1665 bool bound; 1666 }; 1667 1668 #define nft_trans_elem_set(trans) \ 1669 (((struct nft_trans_elem *)trans->data)->set) 1670 #define nft_trans_elem(trans) \ 1671 (((struct nft_trans_elem *)trans->data)->elem) 1672 #define nft_trans_elem_set_bound(trans) \ 1673 (((struct nft_trans_elem *)trans->data)->bound) 1674 1675 struct nft_trans_obj { 1676 struct nft_object *obj; 1677 struct nft_object *newobj; 1678 bool update; 1679 }; 1680 1681 #define nft_trans_obj(trans) \ 1682 (((struct nft_trans_obj *)trans->data)->obj) 1683 #define nft_trans_obj_newobj(trans) \ 1684 (((struct nft_trans_obj *)trans->data)->newobj) 1685 #define nft_trans_obj_update(trans) \ 1686 (((struct nft_trans_obj *)trans->data)->update) 1687 1688 struct nft_trans_flowtable { 1689 struct nft_flowtable *flowtable; 1690 bool update; 1691 struct list_head hook_list; 1692 u32 flags; 1693 }; 1694 1695 #define nft_trans_flowtable(trans) \ 1696 (((struct nft_trans_flowtable *)trans->data)->flowtable) 1697 #define nft_trans_flowtable_update(trans) \ 1698 (((struct nft_trans_flowtable *)trans->data)->update) 1699 #define nft_trans_flowtable_hooks(trans) \ 1700 (((struct nft_trans_flowtable *)trans->data)->hook_list) 1701 #define nft_trans_flowtable_flags(trans) \ 1702 (((struct nft_trans_flowtable *)trans->data)->flags) 1703 1704 int __init nft_chain_filter_init(void); 1705 void nft_chain_filter_fini(void); 1706 1707 void __init nft_chain_route_init(void); 1708 void nft_chain_route_fini(void); 1709 1710 void nf_tables_trans_destroy_flush_work(void); 1711 1712 int nf_msecs_to_jiffies64(const struct nlattr *nla, u64 *result); 1713 __be64 nf_jiffies64_to_msecs(u64 input); 1714 1715 #ifdef CONFIG_MODULES 1716 __printf(2, 3) int nft_request_module(struct net *net, const char *fmt, ...); 1717 #else 1718 static inline int nft_request_module(struct net *net, const char *fmt, ...) { return -ENOENT; } 1719 #endif 1720 1721 struct nftables_pernet { 1722 struct list_head tables; 1723 struct list_head commit_list; 1724 struct list_head module_list; 1725 struct list_head notify_list; 1726 struct mutex commit_mutex; 1727 u64 table_handle; 1728 unsigned int base_seq; 1729 }; 1730 1731 extern unsigned int nf_tables_net_id; 1732 1733 static inline struct nftables_pernet *nft_pernet(const struct net *net) 1734 { 1735 return net_generic(net, nf_tables_net_id); 1736 } 1737 1738 #define __NFT_REDUCE_READONLY 1UL 1739 #define NFT_REDUCE_READONLY (void *)__NFT_REDUCE_READONLY 1740 1741 static inline bool nft_reduce_is_readonly(const struct nft_expr *expr) 1742 { 1743 return expr->ops->reduce == NFT_REDUCE_READONLY; 1744 } 1745 1746 void nft_reg_track_update(struct nft_regs_track *track, 1747 const struct nft_expr *expr, u8 dreg, u8 len); 1748 void nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg, u8 len); 1749 void __nft_reg_track_cancel(struct nft_regs_track *track, u8 dreg); 1750 1751 static inline bool nft_reg_track_cmp(struct nft_regs_track *track, 1752 const struct nft_expr *expr, u8 dreg) 1753 { 1754 return track->regs[dreg].selector && 1755 track->regs[dreg].selector->ops == expr->ops && 1756 track->regs[dreg].num_reg == 0; 1757 } 1758 1759 #endif /* _NET_NF_TABLES_H */ 1760