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