net/netfilter/nft_ct.c

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