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, 645 const struct nft_expr *expr, bool reset) 646 { 647 const struct nft_ct *priv = nft_expr_priv(expr); 648 649 if (nft_dump_register(skb, NFTA_CT_DREG, priv->dreg)) 650 goto nla_put_failure; 651 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) 652 goto nla_put_failure; 653 654 switch (priv->key) { 655 case NFT_CT_SRC: 656 case NFT_CT_DST: 657 case NFT_CT_SRC_IP: 658 case NFT_CT_DST_IP: 659 case NFT_CT_SRC_IP6: 660 case NFT_CT_DST_IP6: 661 case NFT_CT_PROTO_SRC: 662 case NFT_CT_PROTO_DST: 663 if (nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 664 goto nla_put_failure; 665 break; 666 case NFT_CT_BYTES: 667 case NFT_CT_PKTS: 668 case NFT_CT_AVGPKT: 669 case NFT_CT_ZONE: 670 if (priv->dir < IP_CT_DIR_MAX && 671 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 672 goto nla_put_failure; 673 break; 674 default: 675 break; 676 } 677 678 return 0; 679 680 nla_put_failure: 681 return -1; 682 } 683 684 static bool nft_ct_get_reduce(struct nft_regs_track *track, 685 const struct nft_expr *expr) 686 { 687 const struct nft_ct *priv = nft_expr_priv(expr); 688 const struct nft_ct *ct; 689 690 if (!nft_reg_track_cmp(track, expr, priv->dreg)) { 691 nft_reg_track_update(track, expr, priv->dreg, priv->len); 692 return false; 693 } 694 695 ct = nft_expr_priv(track->regs[priv->dreg].selector); 696 if (priv->key != ct->key) { 697 nft_reg_track_update(track, expr, priv->dreg, priv->len); 698 return false; 699 } 700 701 if (!track->regs[priv->dreg].bitwise) 702 return true; 703 704 return nft_expr_reduce_bitwise(track, expr); 705 } 706 707 static int nft_ct_set_dump(struct sk_buff *skb, 708 const struct nft_expr *expr, bool reset) 709 { 710 const struct nft_ct *priv = nft_expr_priv(expr); 711 712 if (nft_dump_register(skb, NFTA_CT_SREG, priv->sreg)) 713 goto nla_put_failure; 714 if (nla_put_be32(skb, NFTA_CT_KEY, htonl(priv->key))) 715 goto nla_put_failure; 716 717 switch (priv->key) { 718 case NFT_CT_ZONE: 719 if (priv->dir < IP_CT_DIR_MAX && 720 nla_put_u8(skb, NFTA_CT_DIRECTION, priv->dir)) 721 goto nla_put_failure; 722 break; 723 default: 724 break; 725 } 726 727 return 0; 728 729 nla_put_failure: 730 return -1; 731 } 732 733 static struct nft_expr_type nft_ct_type; 734 static const struct nft_expr_ops nft_ct_get_ops = { 735 .type = &nft_ct_type, 736 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 737 .eval = nft_ct_get_eval, 738 .init = nft_ct_get_init, 739 .destroy = nft_ct_get_destroy, 740 .dump = nft_ct_get_dump, 741 .reduce = nft_ct_get_reduce, 742 }; 743 744 static bool nft_ct_set_reduce(struct nft_regs_track *track, 745 const struct nft_expr *expr) 746 { 747 int i; 748 749 for (i = 0; i < NFT_REG32_NUM; i++) { 750 if (!track->regs[i].selector) 751 continue; 752 753 if (track->regs[i].selector->ops != &nft_ct_get_ops) 754 continue; 755 756 __nft_reg_track_cancel(track, i); 757 } 758 759 return false; 760 } 761 762 static const struct nft_expr_ops nft_ct_set_ops = { 763 .type = &nft_ct_type, 764 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 765 .eval = nft_ct_set_eval, 766 .init = nft_ct_set_init, 767 .destroy = nft_ct_set_destroy, 768 .dump = nft_ct_set_dump, 769 .reduce = nft_ct_set_reduce, 770 }; 771 772 #ifdef CONFIG_NF_CONNTRACK_ZONES 773 static const struct nft_expr_ops nft_ct_set_zone_ops = { 774 .type = &nft_ct_type, 775 .size = NFT_EXPR_SIZE(sizeof(struct nft_ct)), 776 .eval = nft_ct_set_zone_eval, 777 .init = nft_ct_set_init, 778 .destroy = nft_ct_set_destroy, 779 .dump = nft_ct_set_dump, 780 .reduce = nft_ct_set_reduce, 781 }; 782 #endif 783 784 static const struct nft_expr_ops * 785 nft_ct_select_ops(const struct nft_ctx *ctx, 786 const struct nlattr * const tb[]) 787 { 788 if (tb[NFTA_CT_KEY] == NULL) 789 return ERR_PTR(-EINVAL); 790 791 if (tb[NFTA_CT_DREG] && tb[NFTA_CT_SREG]) 792 return ERR_PTR(-EINVAL); 793 794 if (tb[NFTA_CT_DREG]) 795 return &nft_ct_get_ops; 796 797 if (tb[NFTA_CT_SREG]) { 798 #ifdef CONFIG_NF_CONNTRACK_ZONES 799 if (nla_get_be32(tb[NFTA_CT_KEY]) == htonl(NFT_CT_ZONE)) 800 return &nft_ct_set_zone_ops; 801 #endif 802 return &nft_ct_set_ops; 803 } 804 805 return ERR_PTR(-EINVAL); 806 } 807 808 static struct nft_expr_type nft_ct_type __read_mostly = { 809 .name = "ct", 810 .select_ops = nft_ct_select_ops, 811 .policy = nft_ct_policy, 812 .maxattr = NFTA_CT_MAX, 813 .owner = THIS_MODULE, 814 }; 815 816 static void nft_notrack_eval(const struct nft_expr *expr, 817 struct nft_regs *regs, 818 const struct nft_pktinfo *pkt) 819 { 820 struct sk_buff *skb = pkt->skb; 821 enum ip_conntrack_info ctinfo; 822 struct nf_conn *ct; 823 824 ct = nf_ct_get(pkt->skb, &ctinfo); 825 /* Previously seen (loopback or untracked)? Ignore. */ 826 if (ct || ctinfo == IP_CT_UNTRACKED) 827 return; 828 829 nf_ct_set(skb, ct, IP_CT_UNTRACKED); 830 } 831 832 static struct nft_expr_type nft_notrack_type; 833 static const struct nft_expr_ops nft_notrack_ops = { 834 .type = &nft_notrack_type, 835 .size = NFT_EXPR_SIZE(0), 836 .eval = nft_notrack_eval, 837 .reduce = NFT_REDUCE_READONLY, 838 }; 839 840 static struct nft_expr_type nft_notrack_type __read_mostly = { 841 .name = "notrack", 842 .ops = &nft_notrack_ops, 843 .owner = THIS_MODULE, 844 }; 845 846 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 847 static int 848 nft_ct_timeout_parse_policy(void *timeouts, 849 const struct nf_conntrack_l4proto *l4proto, 850 struct net *net, const struct nlattr *attr) 851 { 852 struct nlattr **tb; 853 int ret = 0; 854 855 tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb), 856 GFP_KERNEL); 857 858 if (!tb) 859 return -ENOMEM; 860 861 ret = nla_parse_nested_deprecated(tb, 862 l4proto->ctnl_timeout.nlattr_max, 863 attr, 864 l4proto->ctnl_timeout.nla_policy, 865 NULL); 866 if (ret < 0) 867 goto err; 868 869 ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts); 870 871 err: 872 kfree(tb); 873 return ret; 874 } 875 876 struct nft_ct_timeout_obj { 877 struct nf_ct_timeout *timeout; 878 u8 l4proto; 879 }; 880 881 static void nft_ct_timeout_obj_eval(struct nft_object *obj, 882 struct nft_regs *regs, 883 const struct nft_pktinfo *pkt) 884 { 885 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 886 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb); 887 struct nf_conn_timeout *timeout; 888 const unsigned int *values; 889 890 if (priv->l4proto != pkt->tprot) 891 return; 892 893 if (!ct || nf_ct_is_template(ct) || nf_ct_is_confirmed(ct)) 894 return; 895 896 timeout = nf_ct_timeout_find(ct); 897 if (!timeout) { 898 timeout = nf_ct_timeout_ext_add(ct, priv->timeout, GFP_ATOMIC); 899 if (!timeout) { 900 regs->verdict.code = NF_DROP; 901 return; 902 } 903 } 904 905 rcu_assign_pointer(timeout->timeout, priv->timeout); 906 907 /* adjust the timeout as per 'new' state. ct is unconfirmed, 908 * so the current timestamp must not be added. 909 */ 910 values = nf_ct_timeout_data(timeout); 911 if (values) 912 nf_ct_refresh(ct, pkt->skb, values[0]); 913 } 914 915 static int nft_ct_timeout_obj_init(const struct nft_ctx *ctx, 916 const struct nlattr * const tb[], 917 struct nft_object *obj) 918 { 919 struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 920 const struct nf_conntrack_l4proto *l4proto; 921 struct nf_ct_timeout *timeout; 922 int l3num = ctx->family; 923 __u8 l4num; 924 int ret; 925 926 if (!tb[NFTA_CT_TIMEOUT_L4PROTO] || 927 !tb[NFTA_CT_TIMEOUT_DATA]) 928 return -EINVAL; 929 930 if (tb[NFTA_CT_TIMEOUT_L3PROTO]) 931 l3num = ntohs(nla_get_be16(tb[NFTA_CT_TIMEOUT_L3PROTO])); 932 933 l4num = nla_get_u8(tb[NFTA_CT_TIMEOUT_L4PROTO]); 934 priv->l4proto = l4num; 935 936 l4proto = nf_ct_l4proto_find(l4num); 937 938 if (l4proto->l4proto != l4num) { 939 ret = -EOPNOTSUPP; 940 goto err_proto_put; 941 } 942 943 timeout = kzalloc(sizeof(struct nf_ct_timeout) + 944 l4proto->ctnl_timeout.obj_size, GFP_KERNEL); 945 if (timeout == NULL) { 946 ret = -ENOMEM; 947 goto err_proto_put; 948 } 949 950 ret = nft_ct_timeout_parse_policy(&timeout->data, l4proto, ctx->net, 951 tb[NFTA_CT_TIMEOUT_DATA]); 952 if (ret < 0) 953 goto err_free_timeout; 954 955 timeout->l3num = l3num; 956 timeout->l4proto = l4proto; 957 958 ret = nf_ct_netns_get(ctx->net, ctx->family); 959 if (ret < 0) 960 goto err_free_timeout; 961 962 priv->timeout = timeout; 963 return 0; 964 965 err_free_timeout: 966 kfree(timeout); 967 err_proto_put: 968 return ret; 969 } 970 971 static void nft_ct_timeout_obj_destroy(const struct nft_ctx *ctx, 972 struct nft_object *obj) 973 { 974 struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 975 struct nf_ct_timeout *timeout = priv->timeout; 976 977 nf_ct_untimeout(ctx->net, timeout); 978 nf_ct_netns_put(ctx->net, ctx->family); 979 kfree(priv->timeout); 980 } 981 982 static int nft_ct_timeout_obj_dump(struct sk_buff *skb, 983 struct nft_object *obj, bool reset) 984 { 985 const struct nft_ct_timeout_obj *priv = nft_obj_data(obj); 986 const struct nf_ct_timeout *timeout = priv->timeout; 987 struct nlattr *nest_params; 988 int ret; 989 990 if (nla_put_u8(skb, NFTA_CT_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) || 991 nla_put_be16(skb, NFTA_CT_TIMEOUT_L3PROTO, htons(timeout->l3num))) 992 return -1; 993 994 nest_params = nla_nest_start(skb, NFTA_CT_TIMEOUT_DATA); 995 if (!nest_params) 996 return -1; 997 998 ret = timeout->l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data); 999 if (ret < 0) 1000 return -1; 1001 nla_nest_end(skb, nest_params); 1002 return 0; 1003 } 1004 1005 static const struct nla_policy nft_ct_timeout_policy[NFTA_CT_TIMEOUT_MAX + 1] = { 1006 [NFTA_CT_TIMEOUT_L3PROTO] = {.type = NLA_U16 }, 1007 [NFTA_CT_TIMEOUT_L4PROTO] = {.type = NLA_U8 }, 1008 [NFTA_CT_TIMEOUT_DATA] = {.type = NLA_NESTED }, 1009 }; 1010 1011 static struct nft_object_type nft_ct_timeout_obj_type; 1012 1013 static const struct nft_object_ops nft_ct_timeout_obj_ops = { 1014 .type = &nft_ct_timeout_obj_type, 1015 .size = sizeof(struct nft_ct_timeout_obj), 1016 .eval = nft_ct_timeout_obj_eval, 1017 .init = nft_ct_timeout_obj_init, 1018 .destroy = nft_ct_timeout_obj_destroy, 1019 .dump = nft_ct_timeout_obj_dump, 1020 }; 1021 1022 static struct nft_object_type nft_ct_timeout_obj_type __read_mostly = { 1023 .type = NFT_OBJECT_CT_TIMEOUT, 1024 .ops = &nft_ct_timeout_obj_ops, 1025 .maxattr = NFTA_CT_TIMEOUT_MAX, 1026 .policy = nft_ct_timeout_policy, 1027 .owner = THIS_MODULE, 1028 }; 1029 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */ 1030 1031 static int nft_ct_helper_obj_init(const struct nft_ctx *ctx, 1032 const struct nlattr * const tb[], 1033 struct nft_object *obj) 1034 { 1035 struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1036 struct nf_conntrack_helper *help4, *help6; 1037 char name[NF_CT_HELPER_NAME_LEN]; 1038 int family = ctx->family; 1039 int err; 1040 1041 if (!tb[NFTA_CT_HELPER_NAME] || !tb[NFTA_CT_HELPER_L4PROTO]) 1042 return -EINVAL; 1043 1044 priv->l4proto = nla_get_u8(tb[NFTA_CT_HELPER_L4PROTO]); 1045 if (!priv->l4proto) 1046 return -ENOENT; 1047 1048 nla_strscpy(name, tb[NFTA_CT_HELPER_NAME], sizeof(name)); 1049 1050 if (tb[NFTA_CT_HELPER_L3PROTO]) 1051 family = ntohs(nla_get_be16(tb[NFTA_CT_HELPER_L3PROTO])); 1052 1053 help4 = NULL; 1054 help6 = NULL; 1055 1056 switch (family) { 1057 case NFPROTO_IPV4: 1058 if (ctx->family == NFPROTO_IPV6) 1059 return -EINVAL; 1060 1061 help4 = nf_conntrack_helper_try_module_get(name, family, 1062 priv->l4proto); 1063 break; 1064 case NFPROTO_IPV6: 1065 if (ctx->family == NFPROTO_IPV4) 1066 return -EINVAL; 1067 1068 help6 = nf_conntrack_helper_try_module_get(name, family, 1069 priv->l4proto); 1070 break; 1071 case NFPROTO_NETDEV: 1072 case NFPROTO_BRIDGE: 1073 case NFPROTO_INET: 1074 help4 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV4, 1075 priv->l4proto); 1076 help6 = nf_conntrack_helper_try_module_get(name, NFPROTO_IPV6, 1077 priv->l4proto); 1078 break; 1079 default: 1080 return -EAFNOSUPPORT; 1081 } 1082 1083 /* && is intentional; only error if INET found neither ipv4 or ipv6 */ 1084 if (!help4 && !help6) 1085 return -ENOENT; 1086 1087 priv->helper4 = help4; 1088 priv->helper6 = help6; 1089 1090 err = nf_ct_netns_get(ctx->net, ctx->family); 1091 if (err < 0) 1092 goto err_put_helper; 1093 1094 return 0; 1095 1096 err_put_helper: 1097 if (priv->helper4) 1098 nf_conntrack_helper_put(priv->helper4); 1099 if (priv->helper6) 1100 nf_conntrack_helper_put(priv->helper6); 1101 return err; 1102 } 1103 1104 static void nft_ct_helper_obj_destroy(const struct nft_ctx *ctx, 1105 struct nft_object *obj) 1106 { 1107 struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1108 1109 if (priv->helper4) 1110 nf_conntrack_helper_put(priv->helper4); 1111 if (priv->helper6) 1112 nf_conntrack_helper_put(priv->helper6); 1113 1114 nf_ct_netns_put(ctx->net, ctx->family); 1115 } 1116 1117 static void nft_ct_helper_obj_eval(struct nft_object *obj, 1118 struct nft_regs *regs, 1119 const struct nft_pktinfo *pkt) 1120 { 1121 const struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1122 struct nf_conn *ct = (struct nf_conn *)skb_nfct(pkt->skb); 1123 struct nf_conntrack_helper *to_assign = NULL; 1124 struct nf_conn_help *help; 1125 1126 if (!ct || 1127 nf_ct_is_confirmed(ct) || 1128 nf_ct_is_template(ct) || 1129 priv->l4proto != nf_ct_protonum(ct)) 1130 return; 1131 1132 switch (nf_ct_l3num(ct)) { 1133 case NFPROTO_IPV4: 1134 to_assign = priv->helper4; 1135 break; 1136 case NFPROTO_IPV6: 1137 to_assign = priv->helper6; 1138 break; 1139 default: 1140 WARN_ON_ONCE(1); 1141 return; 1142 } 1143 1144 if (!to_assign) 1145 return; 1146 1147 if (test_bit(IPS_HELPER_BIT, &ct->status)) 1148 return; 1149 1150 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); 1151 if (help) { 1152 rcu_assign_pointer(help->helper, to_assign); 1153 set_bit(IPS_HELPER_BIT, &ct->status); 1154 } 1155 } 1156 1157 static int nft_ct_helper_obj_dump(struct sk_buff *skb, 1158 struct nft_object *obj, bool reset) 1159 { 1160 const struct nft_ct_helper_obj *priv = nft_obj_data(obj); 1161 const struct nf_conntrack_helper *helper; 1162 u16 family; 1163 1164 if (priv->helper4 && priv->helper6) { 1165 family = NFPROTO_INET; 1166 helper = priv->helper4; 1167 } else if (priv->helper6) { 1168 family = NFPROTO_IPV6; 1169 helper = priv->helper6; 1170 } else { 1171 family = NFPROTO_IPV4; 1172 helper = priv->helper4; 1173 } 1174 1175 if (nla_put_string(skb, NFTA_CT_HELPER_NAME, helper->name)) 1176 return -1; 1177 1178 if (nla_put_u8(skb, NFTA_CT_HELPER_L4PROTO, priv->l4proto)) 1179 return -1; 1180 1181 if (nla_put_be16(skb, NFTA_CT_HELPER_L3PROTO, htons(family))) 1182 return -1; 1183 1184 return 0; 1185 } 1186 1187 static const struct nla_policy nft_ct_helper_policy[NFTA_CT_HELPER_MAX + 1] = { 1188 [NFTA_CT_HELPER_NAME] = { .type = NLA_STRING, 1189 .len = NF_CT_HELPER_NAME_LEN - 1 }, 1190 [NFTA_CT_HELPER_L3PROTO] = { .type = NLA_U16 }, 1191 [NFTA_CT_HELPER_L4PROTO] = { .type = NLA_U8 }, 1192 }; 1193 1194 static struct nft_object_type nft_ct_helper_obj_type; 1195 static const struct nft_object_ops nft_ct_helper_obj_ops = { 1196 .type = &nft_ct_helper_obj_type, 1197 .size = sizeof(struct nft_ct_helper_obj), 1198 .eval = nft_ct_helper_obj_eval, 1199 .init = nft_ct_helper_obj_init, 1200 .destroy = nft_ct_helper_obj_destroy, 1201 .dump = nft_ct_helper_obj_dump, 1202 }; 1203 1204 static struct nft_object_type nft_ct_helper_obj_type __read_mostly = { 1205 .type = NFT_OBJECT_CT_HELPER, 1206 .ops = &nft_ct_helper_obj_ops, 1207 .maxattr = NFTA_CT_HELPER_MAX, 1208 .policy = nft_ct_helper_policy, 1209 .owner = THIS_MODULE, 1210 }; 1211 1212 struct nft_ct_expect_obj { 1213 u16 l3num; 1214 __be16 dport; 1215 u8 l4proto; 1216 u8 size; 1217 u32 timeout; 1218 }; 1219 1220 static int nft_ct_expect_obj_init(const struct nft_ctx *ctx, 1221 const struct nlattr * const tb[], 1222 struct nft_object *obj) 1223 { 1224 struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1225 1226 if (!tb[NFTA_CT_EXPECT_L4PROTO] || 1227 !tb[NFTA_CT_EXPECT_DPORT] || 1228 !tb[NFTA_CT_EXPECT_TIMEOUT] || 1229 !tb[NFTA_CT_EXPECT_SIZE]) 1230 return -EINVAL; 1231 1232 priv->l3num = ctx->family; 1233 if (tb[NFTA_CT_EXPECT_L3PROTO]) 1234 priv->l3num = ntohs(nla_get_be16(tb[NFTA_CT_EXPECT_L3PROTO])); 1235 1236 priv->l4proto = nla_get_u8(tb[NFTA_CT_EXPECT_L4PROTO]); 1237 priv->dport = nla_get_be16(tb[NFTA_CT_EXPECT_DPORT]); 1238 priv->timeout = nla_get_u32(tb[NFTA_CT_EXPECT_TIMEOUT]); 1239 priv->size = nla_get_u8(tb[NFTA_CT_EXPECT_SIZE]); 1240 1241 return nf_ct_netns_get(ctx->net, ctx->family); 1242 } 1243 1244 static void nft_ct_expect_obj_destroy(const struct nft_ctx *ctx, 1245 struct nft_object *obj) 1246 { 1247 nf_ct_netns_put(ctx->net, ctx->family); 1248 } 1249 1250 static int nft_ct_expect_obj_dump(struct sk_buff *skb, 1251 struct nft_object *obj, bool reset) 1252 { 1253 const struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1254 1255 if (nla_put_be16(skb, NFTA_CT_EXPECT_L3PROTO, htons(priv->l3num)) || 1256 nla_put_u8(skb, NFTA_CT_EXPECT_L4PROTO, priv->l4proto) || 1257 nla_put_be16(skb, NFTA_CT_EXPECT_DPORT, priv->dport) || 1258 nla_put_u32(skb, NFTA_CT_EXPECT_TIMEOUT, priv->timeout) || 1259 nla_put_u8(skb, NFTA_CT_EXPECT_SIZE, priv->size)) 1260 return -1; 1261 1262 return 0; 1263 } 1264 1265 static void nft_ct_expect_obj_eval(struct nft_object *obj, 1266 struct nft_regs *regs, 1267 const struct nft_pktinfo *pkt) 1268 { 1269 const struct nft_ct_expect_obj *priv = nft_obj_data(obj); 1270 struct nf_conntrack_expect *exp; 1271 enum ip_conntrack_info ctinfo; 1272 struct nf_conn_help *help; 1273 enum ip_conntrack_dir dir; 1274 u16 l3num = priv->l3num; 1275 struct nf_conn *ct; 1276 1277 ct = nf_ct_get(pkt->skb, &ctinfo); 1278 if (!ct || nf_ct_is_confirmed(ct) || nf_ct_is_template(ct)) { 1279 regs->verdict.code = NFT_BREAK; 1280 return; 1281 } 1282 dir = CTINFO2DIR(ctinfo); 1283 1284 help = nfct_help(ct); 1285 if (!help) 1286 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); 1287 if (!help) { 1288 regs->verdict.code = NF_DROP; 1289 return; 1290 } 1291 1292 if (help->expecting[NF_CT_EXPECT_CLASS_DEFAULT] >= priv->size) { 1293 regs->verdict.code = NFT_BREAK; 1294 return; 1295 } 1296 if (l3num == NFPROTO_INET) 1297 l3num = nf_ct_l3num(ct); 1298 1299 exp = nf_ct_expect_alloc(ct); 1300 if (exp == NULL) { 1301 regs->verdict.code = NF_DROP; 1302 return; 1303 } 1304 nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, l3num, 1305 &ct->tuplehash[!dir].tuple.src.u3, 1306 &ct->tuplehash[!dir].tuple.dst.u3, 1307 priv->l4proto, NULL, &priv->dport); 1308 exp->timeout.expires = jiffies + priv->timeout * HZ; 1309 1310 if (nf_ct_expect_related(exp, 0) != 0) 1311 regs->verdict.code = NF_DROP; 1312 } 1313 1314 static const struct nla_policy nft_ct_expect_policy[NFTA_CT_EXPECT_MAX + 1] = { 1315 [NFTA_CT_EXPECT_L3PROTO] = { .type = NLA_U16 }, 1316 [NFTA_CT_EXPECT_L4PROTO] = { .type = NLA_U8 }, 1317 [NFTA_CT_EXPECT_DPORT] = { .type = NLA_U16 }, 1318 [NFTA_CT_EXPECT_TIMEOUT] = { .type = NLA_U32 }, 1319 [NFTA_CT_EXPECT_SIZE] = { .type = NLA_U8 }, 1320 }; 1321 1322 static struct nft_object_type nft_ct_expect_obj_type; 1323 1324 static const struct nft_object_ops nft_ct_expect_obj_ops = { 1325 .type = &nft_ct_expect_obj_type, 1326 .size = sizeof(struct nft_ct_expect_obj), 1327 .eval = nft_ct_expect_obj_eval, 1328 .init = nft_ct_expect_obj_init, 1329 .destroy = nft_ct_expect_obj_destroy, 1330 .dump = nft_ct_expect_obj_dump, 1331 }; 1332 1333 static struct nft_object_type nft_ct_expect_obj_type __read_mostly = { 1334 .type = NFT_OBJECT_CT_EXPECT, 1335 .ops = &nft_ct_expect_obj_ops, 1336 .maxattr = NFTA_CT_EXPECT_MAX, 1337 .policy = nft_ct_expect_policy, 1338 .owner = THIS_MODULE, 1339 }; 1340 1341 static int __init nft_ct_module_init(void) 1342 { 1343 int err; 1344 1345 BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE > NFT_REG_SIZE); 1346 1347 err = nft_register_expr(&nft_ct_type); 1348 if (err < 0) 1349 return err; 1350 1351 err = nft_register_expr(&nft_notrack_type); 1352 if (err < 0) 1353 goto err1; 1354 1355 err = nft_register_obj(&nft_ct_helper_obj_type); 1356 if (err < 0) 1357 goto err2; 1358 1359 err = nft_register_obj(&nft_ct_expect_obj_type); 1360 if (err < 0) 1361 goto err3; 1362 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1363 err = nft_register_obj(&nft_ct_timeout_obj_type); 1364 if (err < 0) 1365 goto err4; 1366 #endif 1367 return 0; 1368 1369 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1370 err4: 1371 nft_unregister_obj(&nft_ct_expect_obj_type); 1372 #endif 1373 err3: 1374 nft_unregister_obj(&nft_ct_helper_obj_type); 1375 err2: 1376 nft_unregister_expr(&nft_notrack_type); 1377 err1: 1378 nft_unregister_expr(&nft_ct_type); 1379 return err; 1380 } 1381 1382 static void __exit nft_ct_module_exit(void) 1383 { 1384 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT 1385 nft_unregister_obj(&nft_ct_timeout_obj_type); 1386 #endif 1387 nft_unregister_obj(&nft_ct_expect_obj_type); 1388 nft_unregister_obj(&nft_ct_helper_obj_type); 1389 nft_unregister_expr(&nft_notrack_type); 1390 nft_unregister_expr(&nft_ct_type); 1391 } 1392 1393 module_init(nft_ct_module_init); 1394 module_exit(nft_ct_module_exit); 1395 1396 MODULE_LICENSE("GPL"); 1397 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 1398 MODULE_ALIAS_NFT_EXPR("ct"); 1399 MODULE_ALIAS_NFT_EXPR("notrack"); 1400 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_HELPER); 1401 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_TIMEOUT); 1402 MODULE_ALIAS_NFT_OBJ(NFT_OBJECT_CT_EXPECT); 1403 MODULE_DESCRIPTION("Netfilter nf_tables conntrack module"); 1404