1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> 4 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org> 5 * 6 * Development of this code funded by Astaro AG (http://www.astaro.com/) 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/init.h> 11 #include <linux/module.h> 12 #include <linux/netlink.h> 13 #include <linux/netfilter.h> 14 #include <linux/netfilter/nf_tables.h> 15 #include <net/netfilter/nf_tables.h> 16 #include <net/netfilter/nf_conntrack.h> 17 #include <net/netfilter/nf_conntrack_acct.h> 18 #include <net/netfilter/nf_conntrack_tuple.h> 19 #include <net/netfilter/nf_conntrack_helper.h> 20 #include <net/netfilter/nf_conntrack_ecache.h> 21 #include <net/netfilter/nf_conntrack_labels.h> 22 #include <net/netfilter/nf_conntrack_timeout.h> 23 #include <net/netfilter/nf_conntrack_l4proto.h> 24 #include <net/netfilter/nf_conntrack_expect.h> 25 26 struct nft_ct { 27 enum nft_ct_keys key:8; 28 enum ip_conntrack_dir dir:8; 29 u8 len; 30 union { 31 u8 dreg; 32 u8 sreg; 33 }; 34 }; 35 36 struct nft_ct_helper_obj { 37 struct nf_conntrack_helper *helper4; 38 struct nf_conntrack_helper *helper6; 39 u8 l4proto; 40 }; 41 42 #ifdef CONFIG_NF_CONNTRACK_ZONES 43 static DEFINE_PER_CPU(struct nf_conn *, nft_ct_pcpu_template); 44 static unsigned int nft_ct_pcpu_template_refcnt __read_mostly; 45 static DEFINE_MUTEX(nft_ct_pcpu_mutex); 46 #endif 47 48 static u64 nft_ct_get_eval_counter(const struct nf_conn_counter *c, 49 enum nft_ct_keys k, 50 enum ip_conntrack_dir d) 51 { 52 if (d < IP_CT_DIR_MAX) 53 return k == NFT_CT_BYTES ? atomic64_read(&c[d].bytes) : 54 atomic64_read(&c[d].packets); 55 56 return nft_ct_get_eval_counter(c, k, IP_CT_DIR_ORIGINAL) + 57 nft_ct_get_eval_counter(c, k, IP_CT_DIR_REPLY); 58 } 59 60 static void nft_ct_get_eval(const struct nft_expr *expr, 61 struct nft_regs *regs, 62 const struct nft_pktinfo *pkt) 63 { 64 const struct nft_ct *priv = nft_expr_priv(expr); 65 u32 *dest = ®s->data[priv->dreg]; 66 enum ip_conntrack_info ctinfo; 67 const struct nf_conn *ct; 68 const struct nf_conn_help *help; 69 const struct nf_conntrack_tuple *tuple; 70 const struct nf_conntrack_helper *helper; 71 unsigned int state; 72 73 ct = nf_ct_get(pkt->skb, &ctinfo); 74 75 switch (priv->key) { 76 case NFT_CT_STATE: 77 if (ct) 78 state = NF_CT_STATE_BIT(ctinfo); 79 else if (ctinfo == IP_CT_UNTRACKED) 80 state = NF_CT_STATE_UNTRACKED_BIT; 81 else 82 state = NF_CT_STATE_INVALID_BIT; 83 *dest = state; 84 return; 85 default: 86 break; 87 } 88 89 if (ct == NULL) 90 goto err; 91 92 switch (priv->key) { 93 case NFT_CT_DIRECTION: 94 nft_reg_store8(dest, CTINFO2DIR(ctinfo)); 95 return; 96 case NFT_CT_STATUS: 97 *dest = ct->status; 98 return; 99 #ifdef CONFIG_NF_CONNTRACK_MARK 100 case NFT_CT_MARK: 101 *dest = READ_ONCE(ct->mark); 102 return; 103 #endif 104 #ifdef CONFIG_NF_CONNTRACK_SECMARK 105 case NFT_CT_SECMARK: 106 *dest = ct->secmark; 107 return; 108 #endif 109 case NFT_CT_EXPIRATION: 110 *dest = jiffies_to_msecs(nf_ct_expires(ct)); 111 return; 112 case NFT_CT_HELPER: 113 if (ct->master == NULL) 114 goto err; 115 help = nfct_help(ct->master); 116 if (help == NULL) 117 goto err; 118 helper = rcu_dereference(help->helper); 119 if (helper == NULL) 120 goto err; 121 strncpy((char *)dest, helper->name, NF_CT_HELPER_NAME_LEN); 122 return; 123 #ifdef CONFIG_NF_CONNTRACK_LABELS 124 case NFT_CT_LABELS: { 125 struct nf_conn_labels *labels = nf_ct_labels_find(ct); 126 127 if (labels) 128 memcpy(dest, labels->bits, NF_CT_LABELS_MAX_SIZE); 129 else 130 memset(dest, 0, NF_CT_LABELS_MAX_SIZE); 131 return; 132 } 133 #endif 134 case NFT_CT_BYTES: 135 case NFT_CT_PKTS: { 136 const struct nf_conn_acct *acct = nf_conn_acct_find(ct); 137 u64 count = 0; 138 139 if (acct) 140 count = nft_ct_get_eval_counter(acct->counter, 141 priv->key, priv->dir); 142 memcpy(dest, &count, sizeof(count)); 143 return; 144 } 145 case NFT_CT_AVGPKT: { 146 const struct nf_conn_acct *acct = nf_conn_acct_find(ct); 147 u64 avgcnt = 0, bcnt = 0, pcnt = 0; 148 149 if (acct) { 150 pcnt = nft_ct_get_eval_counter(acct->counter, 151 NFT_CT_PKTS, priv->dir); 152 bcnt = nft_ct_get_eval_counter(acct->counter, 153 NFT_CT_BYTES, priv->dir); 154 if (pcnt != 0) 155 avgcnt = div64_u64(bcnt, pcnt); 156 } 157 158 memcpy(dest, &avgcnt, sizeof(avgcnt)); 159 return; 160 } 161 case NFT_CT_L3PROTOCOL: 162 nft_reg_store8(dest, nf_ct_l3num(ct)); 163 return; 164 case NFT_CT_PROTOCOL: 165 nft_reg_store8(dest, nf_ct_protonum(ct)); 166 return; 167 #ifdef CONFIG_NF_CONNTRACK_ZONES 168 case NFT_CT_ZONE: { 169 const struct nf_conntrack_zone *zone = nf_ct_zone(ct); 170 u16 zoneid; 171 172 if (priv->dir < IP_CT_DIR_MAX) 173 zoneid = nf_ct_zone_id(zone, priv->dir); 174 else 175 zoneid = zone->id; 176 177 nft_reg_store16(dest, zoneid); 178 return; 179 } 180 #endif 181 case NFT_CT_ID: 182 *dest = nf_ct_get_id(ct); 183 return; 184 default: 185 break; 186 } 187 188 tuple = &ct->tuplehash[priv->dir].tuple; 189 switch (priv->key) { 190 case NFT_CT_SRC: 191 memcpy(dest, tuple->src.u3.all, 192 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); 193 return; 194 case NFT_CT_DST: 195 memcpy(dest, tuple->dst.u3.all, 196 nf_ct_l3num(ct) == NFPROTO_IPV4 ? 4 : 16); 197 return; 198 case NFT_CT_PROTO_SRC: 199 nft_reg_store16(dest, (__force u16)tuple->src.u.all); 200 return; 201 case NFT_CT_PROTO_DST: 202 nft_reg_store16(dest, (__force u16)tuple->dst.u.all); 203 return; 204 case NFT_CT_SRC_IP: 205 if (nf_ct_l3num(ct) != NFPROTO_IPV4) 206 goto err; 207 *dest = (__force __u32)tuple->src.u3.ip; 208 return; 209 case NFT_CT_DST_IP: 210 if (nf_ct_l3num(ct) != NFPROTO_IPV4) 211 goto err; 212 *dest = (__force __u32)tuple->dst.u3.ip; 213 return; 214 case NFT_CT_SRC_IP6: 215 if (nf_ct_l3num(ct) != NFPROTO_IPV6) 216 goto err; 217 memcpy(dest, tuple->src.u3.ip6, sizeof(struct in6_addr)); 218 return; 219 case NFT_CT_DST_IP6: 220 if (nf_ct_l3num(ct) != NFPROTO_IPV6) 221 goto err; 222 memcpy(dest, tuple->dst.u3.ip6, sizeof(struct in6_addr)); 223 return; 224 default: 225 break; 226 } 227 return; 228 err: 229 regs->verdict.code = NFT_BREAK; 230 } 231 232 #ifdef CONFIG_NF_CONNTRACK_ZONES 233 static void nft_ct_set_zone_eval(const struct nft_expr *expr, 234 struct nft_regs *regs, 235 const struct nft_pktinfo *pkt) 236 { 237 struct nf_conntrack_zone zone = { .dir = NF_CT_DEFAULT_ZONE_DIR }; 238 const struct nft_ct *priv = nft_expr_priv(expr); 239 struct sk_buff *skb = pkt->skb; 240 enum ip_conntrack_info ctinfo; 241 u16 value = nft_reg_load16(®s->data[priv->sreg]); 242 struct nf_conn *ct; 243 244 ct = nf_ct_get(skb, &ctinfo); 245 if (ct) /* already tracked */ 246 return; 247 248 zone.id = value; 249 250 switch (priv->dir) { 251 case IP_CT_DIR_ORIGINAL: 252 zone.dir = NF_CT_ZONE_DIR_ORIG; 253 break; 254 case IP_CT_DIR_REPLY: 255 zone.dir = NF_CT_ZONE_DIR_REPL; 256 break; 257 default: 258 break; 259 } 260 261 ct = this_cpu_read(nft_ct_pcpu_template); 262 263 if (likely(refcount_read(&ct->ct_general.use) == 1)) { 264 refcount_inc(&ct->ct_general.use); 265 nf_ct_zone_add(ct, &zone); 266 } else { 267 /* previous skb got queued to userspace, allocate temporary 268 * one until percpu template can be reused. 269 */ 270 ct = nf_ct_tmpl_alloc(nft_net(pkt), &zone, GFP_ATOMIC); 271 if (!ct) { 272 regs->verdict.code = NF_DROP; 273 return; 274 } 275 } 276 277 nf_ct_set(skb, ct, IP_CT_NEW); 278 } 279 #endif 280 281 static void nft_ct_set_eval(const struct nft_expr *expr, 282 struct nft_regs *regs, 283 const struct nft_pktinfo *pkt) 284 { 285 const struct nft_ct *priv = nft_expr_priv(expr); 286 struct sk_buff *skb = pkt->skb; 287 #if defined(CONFIG_NF_CONNTRACK_MARK) || defined(CONFIG_NF_CONNTRACK_SECMARK) 288 u32 value = regs->data[priv->sreg]; 289 #endif 290 enum ip_conntrack_info ctinfo; 291 struct nf_conn *ct; 292 293 ct = nf_ct_get(skb, &ctinfo); 294 if (ct == NULL || nf_ct_is_template(ct)) 295 return; 296 297 switch (priv->key) { 298 #ifdef CONFIG_NF_CONNTRACK_MARK 299 case NFT_CT_MARK: 300 if (READ_ONCE(ct->mark) != value) { 301 WRITE_ONCE(ct->mark, value); 302 nf_conntrack_event_cache(IPCT_MARK, ct); 303 } 304 break; 305 #endif 306 #ifdef CONFIG_NF_CONNTRACK_SECMARK 307 case NFT_CT_SECMARK: 308 if (ct->secmark != value) { 309 ct->secmark = value; 310 nf_conntrack_event_cache(IPCT_SECMARK, ct); 311 } 312 break; 313 #endif 314 #ifdef CONFIG_NF_CONNTRACK_LABELS 315 case NFT_CT_LABELS: 316 nf_connlabels_replace(ct, 317 ®s->data[priv->sreg], 318 ®s->data[priv->sreg], 319 NF_CT_LABELS_MAX_SIZE / sizeof(u32)); 320 break; 321 #endif 322 #ifdef CONFIG_NF_CONNTRACK_EVENTS 323 case NFT_CT_EVENTMASK: { 324 struct nf_conntrack_ecache *e = nf_ct_ecache_find(ct); 325 u32 ctmask = regs->data[priv->sreg]; 326 327 if (e) { 328 if (e->ctmask != ctmask) 329 e->ctmask = ctmask; 330 break; 331 } 332 333 if (ctmask && !nf_ct_is_confirmed(ct)) 334 nf_ct_ecache_ext_add(ct, ctmask, 0, GFP_ATOMIC); 335 break; 336 } 337 #endif 338 default: 339 break; 340 } 341 } 342 343 static const struct nla_policy nft_ct_policy[NFTA_CT_MAX + 1] = { 344 [NFTA_CT_DREG] = { .type = NLA_U32 }, 345 [NFTA_CT_KEY] = { .type = NLA_U32 }, 346 [NFTA_CT_DIRECTION] = { .type = NLA_U8 }, 347 [NFTA_CT_SREG] = { .type = NLA_U32 }, 348 }; 349 350 #ifdef CONFIG_NF_CONNTRACK_ZONES 351 static void nft_ct_tmpl_put_pcpu(void) 352 { 353 struct nf_conn *ct; 354 int cpu; 355 356 for_each_possible_cpu(cpu) { 357 ct = per_cpu(nft_ct_pcpu_template, cpu); 358 if (!ct) 359 break; 360 nf_ct_put(ct); 361 per_cpu(nft_ct_pcpu_template, cpu) = NULL; 362 } 363 } 364 365 static bool nft_ct_tmpl_alloc_pcpu(void) 366 { 367 struct nf_conntrack_zone zone = { .id = 0 }; 368 struct nf_conn *tmp; 369 int cpu; 370 371 if (nft_ct_pcpu_template_refcnt) 372 return true; 373 374 for_each_possible_cpu(cpu) { 375 tmp = nf_ct_tmpl_alloc(&init_net, &zone, GFP_KERNEL); 376 if (!tmp) { 377 nft_ct_tmpl_put_pcpu(); 378 return false; 379 } 380 381 per_cpu(nft_ct_pcpu_template, cpu) = tmp; 382 } 383 384 return true; 385 } 386 #endif 387 388 static int nft_ct_get_init(const struct nft_ctx *ctx, 389 const struct nft_expr *expr, 390 const struct nlattr * const tb[]) 391 { 392 struct nft_ct *priv = nft_expr_priv(expr); 393 unsigned int len; 394 int err; 395 396 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); 397 priv->dir = IP_CT_DIR_MAX; 398 switch (priv->key) { 399 case NFT_CT_DIRECTION: 400 if (tb[NFTA_CT_DIRECTION] != NULL) 401 return -EINVAL; 402 len = sizeof(u8); 403 break; 404 case NFT_CT_STATE: 405 case NFT_CT_STATUS: 406 #ifdef CONFIG_NF_CONNTRACK_MARK 407 case NFT_CT_MARK: 408 #endif 409 #ifdef CONFIG_NF_CONNTRACK_SECMARK 410 case NFT_CT_SECMARK: 411 #endif 412 case NFT_CT_EXPIRATION: 413 if (tb[NFTA_CT_DIRECTION] != NULL) 414 return -EINVAL; 415 len = sizeof(u32); 416 break; 417 #ifdef CONFIG_NF_CONNTRACK_LABELS 418 case NFT_CT_LABELS: 419 if (tb[NFTA_CT_DIRECTION] != NULL) 420 return -EINVAL; 421 len = NF_CT_LABELS_MAX_SIZE; 422 break; 423 #endif 424 case NFT_CT_HELPER: 425 if (tb[NFTA_CT_DIRECTION] != NULL) 426 return -EINVAL; 427 len = NF_CT_HELPER_NAME_LEN; 428 break; 429 430 case NFT_CT_L3PROTOCOL: 431 case NFT_CT_PROTOCOL: 432 /* For compatibility, do not report error if NFTA_CT_DIRECTION 433 * attribute is specified. 434 */ 435 len = sizeof(u8); 436 break; 437 case NFT_CT_SRC: 438 case NFT_CT_DST: 439 if (tb[NFTA_CT_DIRECTION] == NULL) 440 return -EINVAL; 441 442 switch (ctx->family) { 443 case NFPROTO_IPV4: 444 len = sizeof_field(struct nf_conntrack_tuple, 445 src.u3.ip); 446 break; 447 case NFPROTO_IPV6: 448 case NFPROTO_INET: 449 len = sizeof_field(struct nf_conntrack_tuple, 450 src.u3.ip6); 451 break; 452 default: 453 return -EAFNOSUPPORT; 454 } 455 break; 456 case NFT_CT_SRC_IP: 457 case NFT_CT_DST_IP: 458 if (tb[NFTA_CT_DIRECTION] == NULL) 459 return -EINVAL; 460 461 len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip); 462 break; 463 case NFT_CT_SRC_IP6: 464 case NFT_CT_DST_IP6: 465 if (tb[NFTA_CT_DIRECTION] == NULL) 466 return -EINVAL; 467 468 len = sizeof_field(struct nf_conntrack_tuple, src.u3.ip6); 469 break; 470 case NFT_CT_PROTO_SRC: 471 case NFT_CT_PROTO_DST: 472 if (tb[NFTA_CT_DIRECTION] == NULL) 473 return -EINVAL; 474 len = sizeof_field(struct nf_conntrack_tuple, src.u.all); 475 break; 476 case NFT_CT_BYTES: 477 case NFT_CT_PKTS: 478 case NFT_CT_AVGPKT: 479 len = sizeof(u64); 480 break; 481 #ifdef CONFIG_NF_CONNTRACK_ZONES 482 case NFT_CT_ZONE: 483 len = sizeof(u16); 484 break; 485 #endif 486 case NFT_CT_ID: 487 len = sizeof(u32); 488 break; 489 default: 490 return -EOPNOTSUPP; 491 } 492 493 if (tb[NFTA_CT_DIRECTION] != NULL) { 494 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); 495 switch (priv->dir) { 496 case IP_CT_DIR_ORIGINAL: 497 case IP_CT_DIR_REPLY: 498 break; 499 default: 500 return -EINVAL; 501 } 502 } 503 504 priv->len = len; 505 err = nft_parse_register_store(ctx, tb[NFTA_CT_DREG], &priv->dreg, NULL, 506 NFT_DATA_VALUE, len); 507 if (err < 0) 508 return err; 509 510 err = nf_ct_netns_get(ctx->net, ctx->family); 511 if (err < 0) 512 return err; 513 514 if (priv->key == NFT_CT_BYTES || 515 priv->key == NFT_CT_PKTS || 516 priv->key == NFT_CT_AVGPKT) 517 nf_ct_set_acct(ctx->net, true); 518 519 return 0; 520 } 521 522 static void __nft_ct_set_destroy(const struct nft_ctx *ctx, struct nft_ct *priv) 523 { 524 switch (priv->key) { 525 #ifdef CONFIG_NF_CONNTRACK_LABELS 526 case NFT_CT_LABELS: 527 nf_connlabels_put(ctx->net); 528 break; 529 #endif 530 #ifdef CONFIG_NF_CONNTRACK_ZONES 531 case NFT_CT_ZONE: 532 mutex_lock(&nft_ct_pcpu_mutex); 533 if (--nft_ct_pcpu_template_refcnt == 0) 534 nft_ct_tmpl_put_pcpu(); 535 mutex_unlock(&nft_ct_pcpu_mutex); 536 break; 537 #endif 538 default: 539 break; 540 } 541 } 542 543 static int nft_ct_set_init(const struct nft_ctx *ctx, 544 const struct nft_expr *expr, 545 const struct nlattr * const tb[]) 546 { 547 struct nft_ct *priv = nft_expr_priv(expr); 548 unsigned int len; 549 int err; 550 551 priv->dir = IP_CT_DIR_MAX; 552 priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY])); 553 switch (priv->key) { 554 #ifdef CONFIG_NF_CONNTRACK_MARK 555 case NFT_CT_MARK: 556 if (tb[NFTA_CT_DIRECTION]) 557 return -EINVAL; 558 len = sizeof_field(struct nf_conn, mark); 559 break; 560 #endif 561 #ifdef CONFIG_NF_CONNTRACK_LABELS 562 case NFT_CT_LABELS: 563 if (tb[NFTA_CT_DIRECTION]) 564 return -EINVAL; 565 len = NF_CT_LABELS_MAX_SIZE; 566 err = nf_connlabels_get(ctx->net, (len * BITS_PER_BYTE) - 1); 567 if (err) 568 return err; 569 break; 570 #endif 571 #ifdef CONFIG_NF_CONNTRACK_ZONES 572 case NFT_CT_ZONE: 573 mutex_lock(&nft_ct_pcpu_mutex); 574 if (!nft_ct_tmpl_alloc_pcpu()) { 575 mutex_unlock(&nft_ct_pcpu_mutex); 576 return -ENOMEM; 577 } 578 nft_ct_pcpu_template_refcnt++; 579 mutex_unlock(&nft_ct_pcpu_mutex); 580 len = sizeof(u16); 581 break; 582 #endif 583 #ifdef CONFIG_NF_CONNTRACK_EVENTS 584 case NFT_CT_EVENTMASK: 585 if (tb[NFTA_CT_DIRECTION]) 586 return -EINVAL; 587 len = sizeof(u32); 588 break; 589 #endif 590 #ifdef CONFIG_NF_CONNTRACK_SECMARK 591 case NFT_CT_SECMARK: 592 if (tb[NFTA_CT_DIRECTION]) 593 return -EINVAL; 594 len = sizeof(u32); 595 break; 596 #endif 597 default: 598 return -EOPNOTSUPP; 599 } 600 601 if (tb[NFTA_CT_DIRECTION]) { 602 priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]); 603 switch (priv->dir) { 604 case IP_CT_DIR_ORIGINAL: 605 case IP_CT_DIR_REPLY: 606 break; 607 default: 608 err = -EINVAL; 609 goto err1; 610 } 611 } 612 613 priv->len = len; 614 err = nft_parse_register_load(tb[NFTA_CT_SREG], &priv->sreg, len); 615 if (err < 0) 616 goto err1; 617 618 err = nf_ct_netns_get(ctx->net, ctx->family); 619 if (err < 0) 620 goto err1; 621 622 return 0; 623 624 err1: 625 __nft_ct_set_destroy(ctx, priv); 626 return err; 627 } 628 629 static void nft_ct_get_destroy(const struct nft_ctx *ctx, 630 const struct nft_expr *expr) 631 { 632 nf_ct_netns_put(ctx->net, ctx->family); 633 } 634 635 static void nft_ct_set_destroy(const struct nft_ctx *ctx, 636 const struct nft_expr *expr) 637 { 638 struct nft_ct *priv = nft_expr_priv(expr); 639 640 __nft_ct_set_destroy(ctx, priv); 641 nf_ct_netns_put(ctx->net, ctx->family); 642 } 643 644 static int nft_ct_get_dump(struct sk_buff *skb, const struct nft_expr *expr) 645 { 646 const struct nft_ct *priv = nft_expr_priv(expr); 647 648 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg)) 649 goto nla_put_failure; 650 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) 651 goto nla_put_failure; 652 653 switch (priv->key) { 654 case NFT_CT_SRC: 655 case NFT_CT_DST: 656 case NFT_CT_SRC_IP: 657 case NFT_CT_DST_IP: 658 case NFT_CT_SRC_IP6: 659 case NFT_CT_DST_IP6: 660 case NFT_CT_PROTO_SRC: 661 case NFT_CT_PROTO_DST: 662 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 663 goto nla_put_failure; 664 break; 665 case NFT_CT_BYTES: 666 case NFT_CT_PKTS: 667 case NFT_CT_AVGPKT: 668 case NFT_CT_ZONE: 669 if (priv->dir < IP_CT_DIR_MAX && 670 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 671 goto nla_put_failure; 672 break; 673 default: 674 break; 675 } 676 677 return 0; 678 679 nla_put_failure: 680 return -1; 681 } 682 683 static bool nft_ct_get_reduce(struct nft_regs_track *track, 684 const struct nft_expr *expr) 685 { 686 const struct nft_ct *priv = nft_expr_priv(expr); 687 const struct nft_ct *ct; 688 689 if (!nft_reg_track_cmp(track, expr, priv->dreg)) { 690 nft_reg_track_update(track, expr, priv->dreg, priv->len); 691 return false; 692 } 693 694 ct = nft_expr_priv(track->regs[priv->dreg].selector); 695 if (priv->key != ct->key) { 696 nft_reg_track_update(track, expr, priv->dreg, priv->len); 697 return false; 698 } 699 700 if (!track->regs[priv->dreg].bitwise) 701 return true; 702 703 return nft_expr_reduce_bitwise(track, expr); 704 } 705 706 static int nft_ct_set_dump(struct sk_buff *skb, const struct nft_expr *expr) 707 { 708 const struct nft_ct *priv = nft_expr_priv(expr); 709 710 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg)) 711 goto nla_put_failure; 712 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) 713 goto nla_put_failure; 714 715 switch (priv->key) { 716 case NFT_CT_ZONE: 717 if (priv->dir < IP_CT_DIR_MAX && 718 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 719 goto nla_put_failure; 720 break; 721 default: 722 break; 723 } 724 725 return 0; 726 727 nla_put_failure: 728 return -1; 729 } 730 731 static struct nft_expr_type nft_ct_type; 732 static const struct nft_expr_ops nft_ct_get_ops = { 733 .type = &nft_ct_type, 734 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 735 .eval = nft_ct_get_eval, 736 .init = nft_ct_get_init, 737 .destroy = nft_ct_get_destroy, 738 .dump = nft_ct_get_dump, 739 .reduce = nft_ct_get_reduce, 740 }; 741 742 static bool nft_ct_set_reduce(struct nft_regs_track *track, 743 const struct nft_expr *expr) 744 { 745 int i; 746 747 for (i = 0; i < NFT_REG32_NUM; i++) { 748 if (!track->regs[i].selector) 749 continue; 750 751 if (track->regs[i].selector->ops != &nft_ct_get_ops) 752 continue; 753 754 __nft_reg_track_cancel(track, i); 755 } 756 757 return false; 758 } 759 760 static const struct nft_expr_ops nft_ct_set_ops = { 761 .type = &nft_ct_type, 762 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 763 .eval = nft_ct_set_eval, 764 .init = nft_ct_set_init, 765 .destroy = nft_ct_set_destroy, 766 .dump = nft_ct_set_dump, 767 .reduce = nft_ct_set_reduce, 768 }; 769 770 #ifdef CONFIG_NF_CONNTRACK_ZONES 771 static const struct nft_expr_ops nft_ct_set_zone_ops = { 772 .type = &nft_ct_type, 773 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 774 .eval = nft_ct_set_zone_eval, 775 .init = nft_ct_set_init, 776 .destroy = nft_ct_set_destroy, 777 .dump = nft_ct_set_dump, 778 .reduce = nft_ct_set_reduce, 779 }; 780 #endif 781 782 static const struct nft_expr_ops * 783 nft_ct_select_ops(const struct nft_ctx *ctx, 784 const struct nlattr * const tb[]) 785 { 786 if (tb[NFTA_CT_KEY] == NULL) 787 return ERR_PTR(-EINVAL); 788 789 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG]) 790 return ERR_PTR(-EINVAL); 791 792 if (tb[NFTA_CT_DREG]) 793 return &nft_ct_get_ops; 794 795 if (tb[NFTA_CT_SREG]) { 796 #ifdef CONFIG_NF_CONNTRACK_ZONES 797 if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE)) 798 return &nft_ct_set_zone_ops; 799 #endif 800 return &nft_ct_set_ops; 801 } 802 803 return ERR_PTR(-EINVAL); 804 } 805 806 static struct nft_expr_type nft_ct_type __read_mostly = { 807 .name = "ct", 808 .select_ops = nft_ct_select_ops, 809 .policy = nft_ct_policy, 810 .maxattr = NFTA_CT_MAX, 811 .owner = THIS_MODULE, 812 }; 813 814 static void nft_notrack_eval(const struct nft_expr *expr, 815 struct nft_regs *regs, 816 const struct nft_pktinfo *pkt) 817 { 818 struct sk_buff *skb = pkt->skb; 819 enum ip_conntrack_info ctinfo; 820 struct nf_conn *ct; 821 822 ct = nf_ct_get(pkt->skb, &ctinfo); 823 /* Previously seen (loopback or untracked)? Ignore. */ 824 if (ct || ctinfo == IP_CT_UNTRACKED) 825 return; 826 827 nf_ct_set(skb, ct, IP_CT_UNTRACKED); 828 } 829 830 static struct nft_expr_type nft_notrack_type; 831 static const struct nft_expr_ops nft_notrack_ops = { 832 .type = &nft_notrack_type, 833 .size = NFT_EXPR_SIZE(0), 834 .eval = nft_notrack_eval, 835 .reduce = NFT_REDUCE_READONLY, 836 }; 837 838 static struct nft_expr_type nft_notrack_type __read_mostly = { 839 .name = "notrack", 840 .ops = &nft_notrack_ops, 841 .owner = THIS_MODULE, 842 }; 843 844 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 845 static int 846 nft_ct_timeout_parse_policy(void *timeouts, 847 const struct nf_conntrack_l4proto *l4proto, 848 struct net *net, const struct nlattr *attr) 849 { 850 struct nlattr **tb; 851 int ret = 0; 852 853 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb), 854 GFP_KERNEL); 855 856 if (!tb) 857 return -ENOMEM; 858 859 ret = nla_parse_nested_deprecated(tb, 860 l4proto->ctnl_timeout.nlattr_max, 861 attr, 862 l4proto->ctnl_timeout.nla_policy, 863 NULL); 864 if (ret < 0) 865 goto err; 866 867 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); 868 869 err: 870 kfree(tb); 871 return ret; 872 } 873 874 struct nft_ct_timeout_obj { 875 struct nf_ct_timeout *timeout; 876 u8 l4proto; 877 }; 878 879 static void nft_ct_timeout_obj_eval(struct nft_object *obj, 880 struct nft_regs *regs, 881 const struct nft_pktinfo *pkt) 882 { 883 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 884 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb); 885 struct nf_conn_timeout *timeout; 886 const unsigned int *values; 887 888 if (priv->l4proto != pkt->tprot) 889 return; 890 891 if (!ct || nf_ct_is_template(ct) || nf_ct_is_confirmed(ct)) 892 return; 893 894 timeout = nf_ct_timeout_find(ct); 895 if (!timeout) { 896 timeout = nf_ct_timeout_ext_add(ct, priv->timeout, GFP_ATOMIC); 897 if (!timeout) { 898 regs->verdict.code = NF_DROP; 899 return; 900 } 901 } 902 903 rcu_assign_pointer(timeout->timeout, priv->timeout); 904 905 /* adjust the timeout as per 'new' state. ct is unconfirmed, 906 * so the current timestamp must not be added. 907 */ 908 values = nf_ct_timeout_data(timeout); 909 if (values) 910 nf_ct_refresh(ct, pkt->skb, values[0]); 911 } 912 913 static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx, 914 const struct nlattr * const tb[], 915 struct nft_object *obj) 916 { 917 struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 918 const struct nf_conntrack_l4proto *l4proto; 919 struct nf_ct_timeout *timeout; 920 int l3num = ctx->family; 921 __u8 l4num; 922 int ret; 923 924 if (!tb[NFTA_CT_TIMEOUT_L4PROTO] || 925 !tb[NFTA_CT_TIMEOUT_DATA]) 926 return -EINVAL; 927 928 if (tb[NFTA_CT_TIMEOUT_L3PROTO]) 929 l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO])); 930 931 l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]); 932 priv->l4proto = l4num; 933 934 l4proto = nf_ct_l4proto_find(l4num); 935 936 if (l4proto->l4proto != l4num) { 937 ret = -EOPNOTSUPP; 938 goto err_proto_put; 939 } 940 941 timeout = kzalloc(sizeof(struct nf_ct_timeout) + 942 l4proto->ctnl_timeout.obj_size, GFP_KERNEL); 943 if (timeout == NULL) { 944 ret = -ENOMEM; 945 goto err_proto_put; 946 } 947 948 ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net, 949 tb[NFTA_CT_TIMEOUT_DATA]); 950 if (ret < 0) 951 goto err_free_timeout; 952 953 timeout->l3num = l3num; 954 timeout->l4proto = l4proto; 955 956 ret = nf_ct_netns_get(ctx->net, ctx->family); 957 if (ret < 0) 958 goto err_free_timeout; 959 960 priv->timeout = timeout; 961 return 0; 962 963 err_free_timeout: 964 kfree(timeout); 965 err_proto_put: 966 return ret; 967 } 968 969 static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx, 970 struct nft_object *obj) 971 { 972 struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 973 struct nf_ct_timeout *timeout = priv->timeout; 974 975 nf_ct_untimeout(ctx->net, timeout); 976 nf_ct_netns_put(ctx->net, ctx->family); 977 kfree(priv->timeout); 978 } 979 980 static int nft_ct_timeout_obj_dump(struct sk_buff *skb, 981 struct nft_object *obj, bool reset) 982 { 983 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 984 const struct nf_ct_timeout *timeout = priv->timeout; 985 struct nlattr *nest_params; 986 int ret; 987 988 if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || 989 nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num))) 990 return -1; 991 992 nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA); 993 if (!nest_params) 994 return -1; 995 996 ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); 997 if (ret < 0) 998 return -1; 999 nla_nest_end(skb, nest_params); 1000 return 0; 1001 } 1002 1003 static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = { 1004 [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 }, 1005 [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 }, 1006 [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED }, 1007 }; 1008 1009 static struct nft_object_type nft_ct_timeout_obj_type; 1010 1011 static const struct nft_object_ops nft_ct_timeout_obj_ops = { 1012 .type = &nft_ct_timeout_obj_type, 1013 .size = sizeof(struct nft_ct_timeout_obj), 1014 .eval = nft_ct_timeout_obj_eval, 1015 .init = nft_ct_timeout_obj_init, 1016 .destroy = nft_ct_timeout_obj_destroy, 1017 .dump = nft_ct_timeout_obj_dump, 1018 }; 1019 1020 static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = { 1021 .type = NFT_OBJECT_CT_TIMEOUT, 1022 .ops = &nft_ct_timeout_obj_ops, 1023 .maxattr = NFTA_CT_TIMEOUT_MAX, 1024 .policy = nft_ct_timeout_policy, 1025 .owner = THIS_MODULE, 1026 }; 1027 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ 1028 1029 static int nft_ct_helper_obj_init(const struct nft_ctx *ctx, 1030 const struct nlattr * const tb[], 1031 struct nft_object *obj) 1032 { 1033 struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1034 struct nf_conntrack_helper *help4, *help6; 1035 char name[NF_CT_HELPER_NAME_LEN]; 1036 int family = ctx->family; 1037 int err; 1038 1039 if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO]) 1040 return -EINVAL; 1041 1042 priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]); 1043 if (!priv->l4proto) 1044 return -ENOENT; 1045 1046 nla_strscpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name)); 1047 1048 if (tb[NFTA_CT_HELPER_L3PROTO]) 1049 family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO])); 1050 1051 help4 = NULL; 1052 help6 = NULL; 1053 1054 switch (family) { 1055 case NFPROTO_IPV4: 1056 if (ctx->family == NFPROTO_IPV6) 1057 return -EINVAL; 1058 1059 help4 = nf_conntrack_helper_try_module_get(name, family, 1060 priv->l4proto); 1061 break; 1062 case NFPROTO_IPV6: 1063 if (ctx->family == NFPROTO_IPV4) 1064 return -EINVAL; 1065 1066 help6 = nf_conntrack_helper_try_module_get(name, family, 1067 priv->l4proto); 1068 break; 1069 case NFPROTO_NETDEV: 1070 case NFPROTO_BRIDGE: 1071 case NFPROTO_INET: 1072 help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4, 1073 priv->l4proto); 1074 help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6, 1075 priv->l4proto); 1076 break; 1077 default: 1078 return -EAFNOSUPPORT; 1079 } 1080 1081 /* && is intentional; only error if INET found neither ipv4 or ipv6 */ 1082 if (!help4 && !help6) 1083 return -ENOENT; 1084 1085 priv->helper4 = help4; 1086 priv->helper6 = help6; 1087 1088 err = nf_ct_netns_get(ctx->net, ctx->family); 1089 if (err < 0) 1090 goto err_put_helper; 1091 1092 return 0; 1093 1094 err_put_helper: 1095 if (priv->helper4) 1096 nf_conntrack_helper_put(priv->helper4); 1097 if (priv->helper6) 1098 nf_conntrack_helper_put(priv->helper6); 1099 return err; 1100 } 1101 1102 static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx, 1103 struct nft_object *obj) 1104 { 1105 struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1106 1107 if (priv->helper4) 1108 nf_conntrack_helper_put(priv->helper4); 1109 if (priv->helper6) 1110 nf_conntrack_helper_put(priv->helper6); 1111 1112 nf_ct_netns_put(ctx->net, ctx->family); 1113 } 1114 1115 static void nft_ct_helper_obj_eval(struct nft_object *obj, 1116 struct nft_regs *regs, 1117 const struct nft_pktinfo *pkt) 1118 { 1119 const struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1120 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb); 1121 struct nf_conntrack_helper *to_assign = NULL; 1122 struct nf_conn_help *help; 1123 1124 if (!ct || 1125 nf_ct_is_confirmed(ct) || 1126 nf_ct_is_template(ct) || 1127 priv->l4proto != nf_ct_protonum(ct)) 1128 return; 1129 1130 switch (nf_ct_l3num(ct)) { 1131 case NFPROTO_IPV4: 1132 to_assign = priv->helper4; 1133 break; 1134 case NFPROTO_IPV6: 1135 to_assign = priv->helper6; 1136 break; 1137 default: 1138 WARN_ON_ONCE(1); 1139 return; 1140 } 1141 1142 if (!to_assign) 1143 return; 1144 1145 if (test_bit(IPS_HELPER_BIT, &ct->status)) 1146 return; 1147 1148 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); 1149 if (help) { 1150 rcu_assign_pointer(help->helper, to_assign); 1151 set_bit(IPS_HELPER_BIT, &ct->status); 1152 } 1153 } 1154 1155 static int nft_ct_helper_obj_dump(struct sk_buff *skb, 1156 struct nft_object *obj, bool reset) 1157 { 1158 const struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1159 const struct nf_conntrack_helper *helper; 1160 u16 family; 1161 1162 if (priv->helper4 && priv->helper6) { 1163 family = NFPROTO_INET; 1164 helper = priv->helper4; 1165 } else if (priv->helper6) { 1166 family = NFPROTO_IPV6; 1167 helper = priv->helper6; 1168 } else { 1169 family = NFPROTO_IPV4; 1170 helper = priv->helper4; 1171 } 1172 1173 if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name)) 1174 return -1; 1175 1176 if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto)) 1177 return -1; 1178 1179 if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family))) 1180 return -1; 1181 1182 return 0; 1183 } 1184 1185 static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = { 1186 [NFTA_CT_HELPER_NAME] = { .type = NLA_STRING, 1187 .len = NF_CT_HELPER_NAME_LEN - 1 }, 1188 [NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 }, 1189 [NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 }, 1190 }; 1191 1192 static struct nft_object_type nft_ct_helper_obj_type; 1193 static const struct nft_object_ops nft_ct_helper_obj_ops = { 1194 .type = &nft_ct_helper_obj_type, 1195 .size = sizeof(struct nft_ct_helper_obj), 1196 .eval = nft_ct_helper_obj_eval, 1197 .init = nft_ct_helper_obj_init, 1198 .destroy = nft_ct_helper_obj_destroy, 1199 .dump = nft_ct_helper_obj_dump, 1200 }; 1201 1202 static struct nft_object_type nft_ct_helper_obj_type __read_mostly = { 1203 .type = NFT_OBJECT_CT_HELPER, 1204 .ops = &nft_ct_helper_obj_ops, 1205 .maxattr = NFTA_CT_HELPER_MAX, 1206 .policy = nft_ct_helper_policy, 1207 .owner = THIS_MODULE, 1208 }; 1209 1210 struct nft_ct_expect_obj { 1211 u16 l3num; 1212 __be16 dport; 1213 u8 l4proto; 1214 u8 size; 1215 u32 timeout; 1216 }; 1217 1218 static int nft_ct_expect_obj_init(const struct nft_ctx *ctx, 1219 const struct nlattr * const tb[], 1220 struct nft_object *obj) 1221 { 1222 struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1223 1224 if (!tb[NFTA_CT_EXPECT_L4PROTO] || 1225 !tb[NFTA_CT_EXPECT_DPORT] || 1226 !tb[NFTA_CT_EXPECT_TIMEOUT] || 1227 !tb[NFTA_CT_EXPECT_SIZE]) 1228 return -EINVAL; 1229 1230 priv->l3num = ctx->family; 1231 if (tb[NFTA_CT_EXPECT_L3PROTO]) 1232 priv->l3num = ntohs(nla_get_be16(tb[NFTA_CT_EXPECT_L3PROTO])); 1233 1234 priv->l4proto = nla_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]); 1235 priv->dport = nla_get_be16(tb[NFTA_CT_EXPECT_DPORT]); 1236 priv->timeout = nla_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]); 1237 priv->size = nla_get_u8(tb[NFTA_CT_EXPECT_SIZE]); 1238 1239 return nf_ct_netns_get(ctx->net, ctx->family); 1240 } 1241 1242 static void nft_ct_expect_obj_destroy(const struct nft_ctx *ctx, 1243 struct nft_object *obj) 1244 { 1245 nf_ct_netns_put(ctx->net, ctx->family); 1246 } 1247 1248 static int nft_ct_expect_obj_dump(struct sk_buff *skb, 1249 struct nft_object *obj, bool reset) 1250 { 1251 const struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1252 1253 if (nla_put_be16(skb, NFTA_CT_EXPECT_L3PROTO, htons(priv->l3num)) || 1254 nla_put_u8(skb, NFTA_CT_EXPECT_L4PROTO, priv->l4proto) || 1255 nla_put_be16(skb, NFTA_CT_EXPECT_DPORT, priv->dport) || 1256 nla_put_u32(skb, NFTA_CT_EXPECT_TIMEOUT, priv->timeout) || 1257 nla_put_u8(skb, NFTA_CT_EXPECT_SIZE, priv->size)) 1258 return -1; 1259 1260 return 0; 1261 } 1262 1263 static void nft_ct_expect_obj_eval(struct nft_object *obj, 1264 struct nft_regs *regs, 1265 const struct nft_pktinfo *pkt) 1266 { 1267 const struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1268 struct nf_conntrack_expect *exp; 1269 enum ip_conntrack_info ctinfo; 1270 struct nf_conn_help *help; 1271 enum ip_conntrack_dir dir; 1272 u16 l3num = priv->l3num; 1273 struct nf_conn *ct; 1274 1275 ct = nf_ct_get(pkt->skb, &ctinfo); 1276 if (!ct || nf_ct_is_confirmed(ct) || nf_ct_is_template(ct)) { 1277 regs->verdict.code = NFT_BREAK; 1278 return; 1279 } 1280 dir = CTINFO2DIR(ctinfo); 1281 1282 help = nfct_help(ct); 1283 if (!help) 1284 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); 1285 if (!help) { 1286 regs->verdict.code = NF_DROP; 1287 return; 1288 } 1289 1290 if (help->expecting[NF_CT_EXPECT_CLASS_DEFAULT] >= priv->size) { 1291 regs->verdict.code = NFT_BREAK; 1292 return; 1293 } 1294 if (l3num == NFPROTO_INET) 1295 l3num = nf_ct_l3num(ct); 1296 1297 exp = nf_ct_expect_alloc(ct); 1298 if (exp == NULL) { 1299 regs->verdict.code = NF_DROP; 1300 return; 1301 } 1302 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, l3num, 1303 &ct->tuplehash[!dir].tuple.src.u3, 1304 &ct->tuplehash[!dir].tuple.dst.u3, 1305 priv->l4proto, NULL, &priv->dport); 1306 exp->timeout.expires = jiffies + priv->timeout * HZ; 1307 1308 if (nf_ct_expect_related(exp, 0) != 0) 1309 regs->verdict.code = NF_DROP; 1310 } 1311 1312 static const struct nla_policy nft_ct_expect_policy[NFTA_CT_EXPECT_MAX + 1] = { 1313 [NFTA_CT_EXPECT_L3PROTO] = { .type = NLA_U16 }, 1314 [NFTA_CT_EXPECT_L4PROTO] = { .type = NLA_U8 }, 1315 [NFTA_CT_EXPECT_DPORT] = { .type = NLA_U16 }, 1316 [NFTA_CT_EXPECT_TIMEOUT] = { .type = NLA_U32 }, 1317 [NFTA_CT_EXPECT_SIZE] = { .type = NLA_U8 }, 1318 }; 1319 1320 static struct nft_object_type nft_ct_expect_obj_type; 1321 1322 static const struct nft_object_ops nft_ct_expect_obj_ops = { 1323 .type = &nft_ct_expect_obj_type, 1324 .size = sizeof(struct nft_ct_expect_obj), 1325 .eval = nft_ct_expect_obj_eval, 1326 .init = nft_ct_expect_obj_init, 1327 .destroy = nft_ct_expect_obj_destroy, 1328 .dump = nft_ct_expect_obj_dump, 1329 }; 1330 1331 static struct nft_object_type nft_ct_expect_obj_type __read_mostly = { 1332 .type = NFT_OBJECT_CT_EXPECT, 1333 .ops = &nft_ct_expect_obj_ops, 1334 .maxattr = NFTA_CT_EXPECT_MAX, 1335 .policy = nft_ct_expect_policy, 1336 .owner = THIS_MODULE, 1337 }; 1338 1339 static int __init nft_ct_module_init(void) 1340 { 1341 int err; 1342 1343 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE); 1344 1345 err = nft_register_expr(&nft_ct_type); 1346 if (err < 0) 1347 return err; 1348 1349 err = nft_register_expr(&nft_notrack_type); 1350 if (err < 0) 1351 goto err1; 1352 1353 err = nft_register_obj(&nft_ct_helper_obj_type); 1354 if (err < 0) 1355 goto err2; 1356 1357 err = nft_register_obj(&nft_ct_expect_obj_type); 1358 if (err < 0) 1359 goto err3; 1360 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1361 err = nft_register_obj(&nft_ct_timeout_obj_type); 1362 if (err < 0) 1363 goto err4; 1364 #endif 1365 return 0; 1366 1367 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1368 err4: 1369 nft_unregister_obj(&nft_ct_expect_obj_type); 1370 #endif 1371 err3: 1372 nft_unregister_obj(&nft_ct_helper_obj_type); 1373 err2: 1374 nft_unregister_expr(&nft_notrack_type); 1375 err1: 1376 nft_unregister_expr(&nft_ct_type); 1377 return err; 1378 } 1379 1380 static void __exit nft_ct_module_exit(void) 1381 { 1382 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1383 nft_unregister_obj(&nft_ct_timeout_obj_type); 1384 #endif 1385 nft_unregister_obj(&nft_ct_expect_obj_type); 1386 nft_unregister_obj(&nft_ct_helper_obj_type); 1387 nft_unregister_expr(&nft_notrack_type); 1388 nft_unregister_expr(&nft_ct_type); 1389 } 1390 1391 module_init(nft_ct_module_init); 1392 module_exit(nft_ct_module_exit); 1393 1394 MODULE_LICENSE("GPL"); 1395 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1396 MODULE_ALIAS_NFT_EXPR("ct"); 1397 MODULE_ALIAS_NFT_EXPR("notrack"); 1398 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER); 1399 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT); 1400 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT); 1401 MODULE_DESCRIPTION("Netfilter nf_tables conntrack module"); 1402