net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/rculist.h>
  22 #include <linux/rculist_nulls.h>
  23 #include <linux/types.h>
  24 #include <linux/timer.h>
  25 #include <linux/security.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/errno.h>
  28 #include <linux/netlink.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/slab.h>
  32 #include <linux/siphash.h>
  33
  34 #include <linux/netfilter.h>
  35 #include <net/netlink.h>
  36 #include <net/sock.h>
  37 #include <net/netfilter/nf_conntrack.h>
  38 #include <net/netfilter/nf_conntrack_core.h>
  39 #include <net/netfilter/nf_conntrack_expect.h>
  40 #include <net/netfilter/nf_conntrack_helper.h>
  41 #include <net/netfilter/nf_conntrack_seqadj.h>
  42 #include <net/netfilter/nf_conntrack_l4proto.h>
  43 #include <net/netfilter/nf_conntrack_tuple.h>
  44 #include <net/netfilter/nf_conntrack_acct.h>
  45 #include <net/netfilter/nf_conntrack_zones.h>
  46 #include <net/netfilter/nf_conntrack_timestamp.h>
  47 #include <net/netfilter/nf_conntrack_labels.h>
  48 #include <net/netfilter/nf_conntrack_synproxy.h>
  49 #ifdef CONFIG_NF_NAT_NEEDED
  50 #include <net/netfilter/nf_nat_core.h>
  51 #include <net/netfilter/nf_nat_l4proto.h>
  52 #include <net/netfilter/nf_nat_helper.h>
  53 #endif
  54
  55 #include <linux/netfilter/nfnetlink.h>
  56 #include <linux/netfilter/nfnetlink_conntrack.h>
  57
  58 MODULE_LICENSE("GPL");
  59
  60 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  61                                 const struct nf_conntrack_tuple *tuple,
  62                                 const struct nf_conntrack_l4proto *l4proto)
  63 {
  64         int ret = 0;
  65         struct nlattr *nest_parms;
  66
  67         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  68         if (!nest_parms)
  69                 goto nla_put_failure;
  70         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  71                 goto nla_put_failure;
  72
  73         if (likely(l4proto->tuple_to_nlattr))
  74                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  75
  76         nla_nest_end(skb, nest_parms);
  77
  78         return ret;
  79
  80 nla_put_failure:
  81         return -1;
  82 }
  83
  84 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
  85                                 const struct nf_conntrack_tuple *tuple)
  86 {
  87         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
  88             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
  89                 return -EMSGSIZE;
  90         return 0;
  91 }
  92
  93 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
  94                                 const struct nf_conntrack_tuple *tuple)
  95 {
  96         if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
  97             nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
  98                 return -EMSGSIZE;
  99         return 0;
 100 }
 101
 102 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 103                                     const struct nf_conntrack_tuple *tuple)
 104 {
 105         int ret = 0;
 106         struct nlattr *nest_parms;
 107
 108         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
 109         if (!nest_parms)
 110                 goto nla_put_failure;
 111
 112         switch (tuple->src.l3num) {
 113         case NFPROTO_IPV4:
 114                 ret = ipv4_tuple_to_nlattr(skb, tuple);
 115                 break;
 116         case NFPROTO_IPV6:
 117                 ret = ipv6_tuple_to_nlattr(skb, tuple);
 118                 break;
 119         }
 120
 121         nla_nest_end(skb, nest_parms);
 122
 123         return ret;
 124
 125 nla_put_failure:
 126         return -1;
 127 }
 128
 129 static int ctnetlink_dump_tuples(struct sk_buff *skb,
 130                                  const struct nf_conntrack_tuple *tuple)
 131 {
 132         const struct nf_conntrack_l4proto *l4proto;
 133         int ret;
 134
 135         rcu_read_lock();
 136         ret = ctnetlink_dump_tuples_ip(skb, tuple);
 137
 138         if (ret >= 0) {
 139                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
 140                                                tuple->dst.protonum);
 141                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 142         }
 143         rcu_read_unlock();
 144         return ret;
 145 }
 146
 147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
 148                                   const struct nf_conntrack_zone *zone, int dir)
 149 {
 150         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
 151                 return 0;
 152         if (nla_put_be16(skb, attrtype, htons(zone->id)))
 153                 goto nla_put_failure;
 154         return 0;
 155
 156 nla_put_failure:
 157         return -1;
 158 }
 159
 160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 161 {
 162         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 163                 goto nla_put_failure;
 164         return 0;
 165
 166 nla_put_failure:
 167         return -1;
 168 }
 169
 170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 171 {
 172         long timeout = nf_ct_expires(ct) / HZ;
 173
 174         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 175                 goto nla_put_failure;
 176         return 0;
 177
 178 nla_put_failure:
 179         return -1;
 180 }
 181
 182 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 183 {
 184         const struct nf_conntrack_l4proto *l4proto;
 185         struct nlattr *nest_proto;
 186         int ret;
 187
 188         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 189         if (!l4proto->to_nlattr)
 190                 return 0;
 191
 192         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 193         if (!nest_proto)
 194                 goto nla_put_failure;
 195
 196         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 197
 198         nla_nest_end(skb, nest_proto);
 199
 200         return ret;
 201
 202 nla_put_failure:
 203         return -1;
 204 }
 205
 206 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
 207                                    const struct nf_conn *ct)
 208 {
 209         struct nlattr *nest_helper;
 210         const struct nf_conn_help *help = nfct_help(ct);
 211         struct nf_conntrack_helper *helper;
 212
 213         if (!help)
 214                 return 0;
 215
 216         rcu_read_lock();
 217         helper = rcu_dereference(help->helper);
 218         if (!helper)
 219                 goto out;
 220
 221         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 222         if (!nest_helper)
 223                 goto nla_put_failure;
 224         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 225                 goto nla_put_failure;
 226
 227         if (helper->to_nlattr)
 228                 helper->to_nlattr(skb, ct);
 229
 230         nla_nest_end(skb, nest_helper);
 231 out:
 232         rcu_read_unlock();
 233         return 0;
 234
 235 nla_put_failure:
 236         rcu_read_unlock();
 237         return -1;
 238 }
 239
 240 static int
 241 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
 242               enum ip_conntrack_dir dir, int type)
 243 {
 244         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 245         struct nf_conn_counter *counter = acct->counter;
 246         struct nlattr *nest_count;
 247         u64 pkts, bytes;
 248
 249         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 250                 pkts = atomic64_xchg(&counter[dir].packets, 0);
 251                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
 252         } else {
 253                 pkts = atomic64_read(&counter[dir].packets);
 254                 bytes = atomic64_read(&counter[dir].bytes);
 255         }
 256
 257         nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
 258         if (!nest_count)
 259                 goto nla_put_failure;
 260
 261         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
 262                          CTA_COUNTERS_PAD) ||
 263             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
 264                          CTA_COUNTERS_PAD))
 265                 goto nla_put_failure;
 266
 267         nla_nest_end(skb, nest_count);
 268
 269         return 0;
 270
 271 nla_put_failure:
 272         return -1;
 273 }
 274
 275 static int
 276 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
 277 {
 278         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
 279
 280         if (!acct)
 281                 return 0;
 282
 283         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
 284                 return -1;
 285         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
 286                 return -1;
 287
 288         return 0;
 289 }
 290
 291 static int
 292 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 293 {
 294         struct nlattr *nest_count;
 295         const struct nf_conn_tstamp *tstamp;
 296
 297         tstamp = nf_conn_tstamp_find(ct);
 298         if (!tstamp)
 299                 return 0;
 300
 301         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 302         if (!nest_count)
 303                 goto nla_put_failure;
 304
 305         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
 306                          CTA_TIMESTAMP_PAD) ||
 307             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 308                                                cpu_to_be64(tstamp->stop),
 309                                                CTA_TIMESTAMP_PAD)))
 310                 goto nla_put_failure;
 311         nla_nest_end(skb, nest_count);
 312
 313         return 0;
 314
 315 nla_put_failure:
 316         return -1;
 317 }
 318
 319 #ifdef CONFIG_NF_CONNTRACK_MARK
 320 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 321 {
 322         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 323                 goto nla_put_failure;
 324         return 0;
 325
 326 nla_put_failure:
 327         return -1;
 328 }
 329 #else
 330 #define ctnetlink_dump_mark(a, b) (0)
 331 #endif
 332
 333 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 334 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 335 {
 336         struct nlattr *nest_secctx;
 337         int len, ret;
 338         char *secctx;
 339
 340         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 341         if (ret)
 342                 return 0;
 343
 344         ret = -1;
 345         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 346         if (!nest_secctx)
 347                 goto nla_put_failure;
 348
 349         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 350                 goto nla_put_failure;
 351         nla_nest_end(skb, nest_secctx);
 352
 353         ret = 0;
 354 nla_put_failure:
 355         security_release_secctx(secctx, len);
 356         return ret;
 357 }
 358 #else
 359 #define ctnetlink_dump_secctx(a, b) (0)
 360 #endif
 361
 362 #ifdef CONFIG_NF_CONNTRACK_LABELS
 363 static inline int ctnetlink_label_size(const struct nf_conn *ct)
 364 {
 365         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 366
 367         if (!labels)
 368                 return 0;
 369         return nla_total_size(sizeof(labels->bits));
 370 }
 371
 372 static int
 373 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 374 {
 375         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 376         unsigned int i;
 377
 378         if (!labels)
 379                 return 0;
 380
 381         i = 0;
 382         do {
 383                 if (labels->bits[i] != 0)
 384                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
 385                                        labels->bits);
 386                 i++;
 387         } while (i < ARRAY_SIZE(labels->bits));
 388
 389         return 0;
 390 }
 391 #else
 392 #define ctnetlink_dump_labels(a, b) (0)
 393 #define ctnetlink_label_size(a) (0)
 394 #endif
 395
 396 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 397
 398 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 399 {
 400         struct nlattr *nest_parms;
 401
 402         if (!(ct->status & IPS_EXPECTED))
 403                 return 0;
 404
 405         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 406         if (!nest_parms)
 407                 goto nla_put_failure;
 408         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 409                 goto nla_put_failure;
 410         nla_nest_end(skb, nest_parms);
 411
 412         return 0;
 413
 414 nla_put_failure:
 415         return -1;
 416 }
 417
 418 static int
 419 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
 420 {
 421         struct nlattr *nest_parms;
 422
 423         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 424         if (!nest_parms)
 425                 goto nla_put_failure;
 426
 427         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
 428                          htonl(seq->correction_pos)) ||
 429             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
 430                          htonl(seq->offset_before)) ||
 431             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
 432                          htonl(seq->offset_after)))
 433                 goto nla_put_failure;
 434
 435         nla_nest_end(skb, nest_parms);
 436
 437         return 0;
 438
 439 nla_put_failure:
 440         return -1;
 441 }
 442
 443 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
 444 {
 445         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
 446         struct nf_ct_seqadj *seq;
 447
 448         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
 449                 return 0;
 450
 451         spin_lock_bh(&ct->lock);
 452         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
 453         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
 454                 goto err;
 455
 456         seq = &seqadj->seq[IP_CT_DIR_REPLY];
 457         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
 458                 goto err;
 459
 460         spin_unlock_bh(&ct->lock);
 461         return 0;
 462 err:
 463         spin_unlock_bh(&ct->lock);
 464         return -1;
 465 }
 466
 467 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
 468 {
 469         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
 470         struct nlattr *nest_parms;
 471
 472         if (!synproxy)
 473                 return 0;
 474
 475         nest_parms = nla_nest_start(skb, CTA_SYNPROXY | NLA_F_NESTED);
 476         if (!nest_parms)
 477                 goto nla_put_failure;
 478
 479         if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
 480             nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
 481             nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
 482                 goto nla_put_failure;
 483
 484         nla_nest_end(skb, nest_parms);
 485
 486         return 0;
 487
 488 nla_put_failure:
 489         return -1;
 490 }
 491
 492 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 493 {
 494         __be32 id = (__force __be32)nf_ct_get_id(ct);
 495
 496         if (nla_put_be32(skb, CTA_ID, id))
 497                 goto nla_put_failure;
 498         return 0;
 499
 500 nla_put_failure:
 501         return -1;
 502 }
 503
 504 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 505 {
 506         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 507                 goto nla_put_failure;
 508         return 0;
 509
 510 nla_put_failure:
 511         return -1;
 512 }
 513
 514 static int
 515 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 516                     struct nf_conn *ct)
 517 {
 518         const struct nf_conntrack_zone *zone;
 519         struct nlmsghdr *nlh;
 520         struct nlattr *nest_parms;
 521         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
 522
 523         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
 524         nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct),
 525                            NFNETLINK_V0, 0);
 526         if (!nlh)
 527                 goto nlmsg_failure;
 528
 529         zone = nf_ct_zone(ct);
 530
 531         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 532         if (!nest_parms)
 533                 goto nla_put_failure;
 534         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 535                 goto nla_put_failure;
 536         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 537                                    NF_CT_ZONE_DIR_ORIG) < 0)
 538                 goto nla_put_failure;
 539         nla_nest_end(skb, nest_parms);
 540
 541         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 542         if (!nest_parms)
 543                 goto nla_put_failure;
 544         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 545                 goto nla_put_failure;
 546         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 547                                    NF_CT_ZONE_DIR_REPL) < 0)
 548                 goto nla_put_failure;
 549         nla_nest_end(skb, nest_parms);
 550
 551         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 552                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 553                 goto nla_put_failure;
 554
 555         if (ctnetlink_dump_status(skb, ct) < 0 ||
 556             ctnetlink_dump_acct(skb, ct, type) < 0 ||
 557             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 558             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 559             ctnetlink_dump_mark(skb, ct) < 0 ||
 560             ctnetlink_dump_secctx(skb, ct) < 0 ||
 561             ctnetlink_dump_labels(skb, ct) < 0 ||
 562             ctnetlink_dump_id(skb, ct) < 0 ||
 563             ctnetlink_dump_use(skb, ct) < 0 ||
 564             ctnetlink_dump_master(skb, ct) < 0 ||
 565             ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
 566             ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 567                 goto nla_put_failure;
 568
 569         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
 570             (ctnetlink_dump_timeout(skb, ct) < 0 ||
 571              ctnetlink_dump_protoinfo(skb, ct) < 0))
 572                 goto nla_put_failure;
 573
 574         nlmsg_end(skb, nlh);
 575         return skb->len;
 576
 577 nlmsg_failure:
 578 nla_put_failure:
 579         nlmsg_cancel(skb, nlh);
 580         return -1;
 581 }
 582
 583 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
 584         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
 585         [CTA_IP_V4_DST] = { .type = NLA_U32 },
 586         [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
 587         [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
 588 };
 589
 590 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
 591 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
 592 {
 593         const struct nf_conntrack_l4proto *l4proto;
 594         size_t len, len4 = 0;
 595
 596         len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
 597         len *= 3u; /* ORIG, REPLY, MASTER */
 598
 599         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 600         len += l4proto->nlattr_size;
 601         if (l4proto->nlattr_tuple_size) {
 602                 len4 = l4proto->nlattr_tuple_size();
 603                 len4 *= 3u; /* ORIG, REPLY, MASTER */
 604         }
 605
 606         return len + len4;
 607 }
 608 #endif
 609
 610 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
 611 {
 612         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 613                 return 0;
 614         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 615                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 616                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 617                ;
 618 }
 619
 620 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
 621 {
 622 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 623         int len, ret;
 624
 625         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 626         if (ret)
 627                 return 0;
 628
 629         return nla_total_size(0) /* CTA_SECCTX */
 630                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 631 #else
 632         return 0;
 633 #endif
 634 }
 635
 636 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
 637 {
 638 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 639         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 640                 return 0;
 641         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
 642 #else
 643         return 0;
 644 #endif
 645 }
 646
 647 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 648 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
 649 {
 650         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 651                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 652                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 653                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 654                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 655                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 656                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 657                + ctnetlink_acct_size(ct)
 658                + ctnetlink_timestamp_size(ct)
 659                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 660                + nla_total_size(0) /* CTA_PROTOINFO */
 661                + nla_total_size(0) /* CTA_HELP */
 662                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 663                + ctnetlink_secctx_size(ct)
 664 #ifdef CONFIG_NF_NAT_NEEDED
 665                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 666                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 667 #endif
 668 #ifdef CONFIG_NF_CONNTRACK_MARK
 669                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 670 #endif
 671 #ifdef CONFIG_NF_CONNTRACK_ZONES
 672                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
 673 #endif
 674                + ctnetlink_proto_size(ct)
 675                + ctnetlink_label_size(ct)
 676                ;
 677 }
 678
 679 static int
 680 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 681 {
 682         const struct nf_conntrack_zone *zone;
 683         struct net *net;
 684         struct nlmsghdr *nlh;
 685         struct nlattr *nest_parms;
 686         struct nf_conn *ct = item->ct;
 687         struct sk_buff *skb;
 688         unsigned int type;
 689         unsigned int flags = 0, group;
 690         int err;
 691
 692         if (events & (1 << IPCT_DESTROY)) {
 693                 type = IPCTNL_MSG_CT_DELETE;
 694                 group = NFNLGRP_CONNTRACK_DESTROY;
 695         } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 696                 type = IPCTNL_MSG_CT_NEW;
 697                 flags = NLM_F_CREATE|NLM_F_EXCL;
 698                 group = NFNLGRP_CONNTRACK_NEW;
 699         } else if (events) {
 700                 type = IPCTNL_MSG_CT_NEW;
 701                 group = NFNLGRP_CONNTRACK_UPDATE;
 702         } else
 703                 return 0;
 704
 705         net = nf_ct_net(ct);
 706         if (!item->report && !nfnetlink_has_listeners(net, group))
 707                 return 0;
 708
 709         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 710         if (skb == NULL)
 711                 goto errout;
 712
 713         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
 714         nlh = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct),
 715                            NFNETLINK_V0, 0);
 716         if (!nlh)
 717                 goto nlmsg_failure;
 718
 719         zone = nf_ct_zone(ct);
 720
 721         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 722         if (!nest_parms)
 723                 goto nla_put_failure;
 724         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 725                 goto nla_put_failure;
 726         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 727                                    NF_CT_ZONE_DIR_ORIG) < 0)
 728                 goto nla_put_failure;
 729         nla_nest_end(skb, nest_parms);
 730
 731         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 732         if (!nest_parms)
 733                 goto nla_put_failure;
 734         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 735                 goto nla_put_failure;
 736         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 737                                    NF_CT_ZONE_DIR_REPL) < 0)
 738                 goto nla_put_failure;
 739         nla_nest_end(skb, nest_parms);
 740
 741         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 742                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 743                 goto nla_put_failure;
 744
 745         if (ctnetlink_dump_id(skb, ct) < 0)
 746                 goto nla_put_failure;
 747
 748         if (ctnetlink_dump_status(skb, ct) < 0)
 749                 goto nla_put_failure;
 750
 751         if (events & (1 << IPCT_DESTROY)) {
 752                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 753                     ctnetlink_dump_timestamp(skb, ct) < 0)
 754                         goto nla_put_failure;
 755         } else {
 756                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 757                         goto nla_put_failure;
 758
 759                 if (events & (1 << IPCT_PROTOINFO)
 760                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 761                         goto nla_put_failure;
 762
 763                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 764                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 765                         goto nla_put_failure;
 766
 767 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 768                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 769                     && ctnetlink_dump_secctx(skb, ct) < 0)
 770                         goto nla_put_failure;
 771 #endif
 772                 if (events & (1 << IPCT_LABEL) &&
 773                      ctnetlink_dump_labels(skb, ct) < 0)
 774                         goto nla_put_failure;
 775
 776                 if (events & (1 << IPCT_RELATED) &&
 777                     ctnetlink_dump_master(skb, ct) < 0)
 778                         goto nla_put_failure;
 779
 780                 if (events & (1 << IPCT_SEQADJ) &&
 781                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 782                         goto nla_put_failure;
 783
 784                 if (events & (1 << IPCT_SYNPROXY) &&
 785                     ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 786                         goto nla_put_failure;
 787         }
 788
 789 #ifdef CONFIG_NF_CONNTRACK_MARK
 790         if ((events & (1 << IPCT_MARK) || ct->mark)
 791             && ctnetlink_dump_mark(skb, ct) < 0)
 792                 goto nla_put_failure;
 793 #endif
 794         nlmsg_end(skb, nlh);
 795         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 796                              GFP_ATOMIC);
 797         if (err == -ENOBUFS || err == -EAGAIN)
 798                 return -ENOBUFS;
 799
 800         return 0;
 801
 802 nla_put_failure:
 803         nlmsg_cancel(skb, nlh);
 804 nlmsg_failure:
 805         kfree_skb(skb);
 806 errout:
 807         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 808                 return -ENOBUFS;
 809
 810         return 0;
 811 }
 812 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 813
 814 static int ctnetlink_done(struct netlink_callback *cb)
 815 {
 816         if (cb->args[1])
 817                 nf_ct_put((struct nf_conn *)cb->args[1]);
 818         kfree(cb->data);
 819         return 0;
 820 }
 821
 822 struct ctnetlink_filter {
 823         struct {
 824                 u_int32_t val;
 825                 u_int32_t mask;
 826         } mark;
 827 };
 828
 829 static struct ctnetlink_filter *
 830 ctnetlink_alloc_filter(const struct nlattr * const cda[])
 831 {
 832 #ifdef CONFIG_NF_CONNTRACK_MARK
 833         struct ctnetlink_filter *filter;
 834
 835         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
 836         if (filter == NULL)
 837                 return ERR_PTR(-ENOMEM);
 838
 839         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
 840         filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
 841
 842         return filter;
 843 #else
 844         return ERR_PTR(-EOPNOTSUPP);
 845 #endif
 846 }
 847
 848 static int ctnetlink_start(struct netlink_callback *cb)
 849 {
 850         const struct nlattr * const *cda = cb->data;
 851         struct ctnetlink_filter *filter = NULL;
 852
 853         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
 854                 filter = ctnetlink_alloc_filter(cda);
 855                 if (IS_ERR(filter))
 856                         return PTR_ERR(filter);
 857         }
 858
 859         cb->data = filter;
 860         return 0;
 861 }
 862
 863 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
 864 {
 865         struct ctnetlink_filter *filter = data;
 866
 867         if (filter == NULL)
 868                 return 1;
 869
 870 #ifdef CONFIG_NF_CONNTRACK_MARK
 871         if ((ct->mark & filter->mark.mask) == filter->mark.val)
 872                 return 1;
 873 #endif
 874
 875         return 0;
 876 }
 877
 878 static int
 879 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 880 {
 881         struct net *net = sock_net(skb->sk);
 882         struct nf_conn *ct, *last;
 883         struct nf_conntrack_tuple_hash *h;
 884         struct hlist_nulls_node *n;
 885         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 886         u_int8_t l3proto = nfmsg->nfgen_family;
 887         struct nf_conn *nf_ct_evict[8];
 888         int res, i;
 889         spinlock_t *lockp;
 890
 891         last = (struct nf_conn *)cb->args[1];
 892         i = 0;
 893
 894         local_bh_disable();
 895         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 896 restart:
 897                 while (i) {
 898                         i--;
 899                         if (nf_ct_should_gc(nf_ct_evict[i]))
 900                                 nf_ct_kill(nf_ct_evict[i]);
 901                         nf_ct_put(nf_ct_evict[i]);
 902                 }
 903
 904                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
 905                 nf_conntrack_lock(lockp);
 906                 if (cb->args[0] >= nf_conntrack_htable_size) {
 907                         spin_unlock(lockp);
 908                         goto out;
 909                 }
 910                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
 911                                            hnnode) {
 912                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 913                                 continue;
 914                         ct = nf_ct_tuplehash_to_ctrack(h);
 915                         if (nf_ct_is_expired(ct)) {
 916                                 if (i < ARRAY_SIZE(nf_ct_evict) &&
 917                                     atomic_inc_not_zero(&ct->ct_general.use))
 918                                         nf_ct_evict[i++] = ct;
 919                                 continue;
 920                         }
 921
 922                         if (!net_eq(net, nf_ct_net(ct)))
 923                                 continue;
 924
 925                         /* Dump entries of a given L3 protocol number.
 926                          * If it is not specified, ie. l3proto == 0,
 927                          * then dump everything. */
 928                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 929                                 continue;
 930                         if (cb->args[1]) {
 931                                 if (ct != last)
 932                                         continue;
 933                                 cb->args[1] = 0;
 934                         }
 935                         if (!ctnetlink_filter_match(ct, cb->data))
 936                                 continue;
 937
 938                         rcu_read_lock();
 939                         res =
 940                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
 941                                             cb->nlh->nlmsg_seq,
 942                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 943                                             ct);
 944                         rcu_read_unlock();
 945                         if (res < 0) {
 946                                 nf_conntrack_get(&ct->ct_general);
 947                                 cb->args[1] = (unsigned long)ct;
 948                                 spin_unlock(lockp);
 949                                 goto out;
 950                         }
 951                 }
 952                 spin_unlock(lockp);
 953                 if (cb->args[1]) {
 954                         cb->args[1] = 0;
 955                         goto restart;
 956                 }
 957         }
 958 out:
 959         local_bh_enable();
 960         if (last) {
 961                 /* nf ct hash resize happened, now clear the leftover. */
 962                 if ((struct nf_conn *)cb->args[1] == last)
 963                         cb->args[1] = 0;
 964
 965                 nf_ct_put(last);
 966         }
 967
 968         while (i) {
 969                 i--;
 970                 if (nf_ct_should_gc(nf_ct_evict[i]))
 971                         nf_ct_kill(nf_ct_evict[i]);
 972                 nf_ct_put(nf_ct_evict[i]);
 973         }
 974
 975         return skb->len;
 976 }
 977
 978 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
 979                                 struct nf_conntrack_tuple *t)
 980 {
 981         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
 982                 return -EINVAL;
 983
 984         t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
 985         t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
 986
 987         return 0;
 988 }
 989
 990 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
 991                                 struct nf_conntrack_tuple *t)
 992 {
 993         if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
 994                 return -EINVAL;
 995
 996         t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
 997         t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
 998
 999         return 0;
1000 }
1001
1002 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1003                                     struct nf_conntrack_tuple *tuple)
1004 {
1005         struct nlattr *tb[CTA_IP_MAX+1];
1006         int ret = 0;
1007
1008         ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL, NULL);
1009         if (ret < 0)
1010                 return ret;
1011
1012         ret = nla_validate_nested(attr, CTA_IP_MAX,
1013                                   cta_ip_nla_policy, NULL);
1014         if (ret)
1015                 return ret;
1016
1017         switch (tuple->src.l3num) {
1018         case NFPROTO_IPV4:
1019                 ret = ipv4_nlattr_to_tuple(tb, tuple);
1020                 break;
1021         case NFPROTO_IPV6:
1022                 ret = ipv6_nlattr_to_tuple(tb, tuple);
1023                 break;
1024         }
1025
1026         return ret;
1027 }
1028
1029 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1030         [CTA_PROTO_NUM] = { .type = NLA_U8 },
1031 };
1032
1033 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1034                                        struct nf_conntrack_tuple *tuple)
1035 {
1036         const struct nf_conntrack_l4proto *l4proto;
1037         struct nlattr *tb[CTA_PROTO_MAX+1];
1038         int ret = 0;
1039
1040         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy,
1041                                NULL);
1042         if (ret < 0)
1043                 return ret;
1044
1045         if (!tb[CTA_PROTO_NUM])
1046                 return -EINVAL;
1047         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1048
1049         rcu_read_lock();
1050         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1051
1052         if (likely(l4proto->nlattr_to_tuple)) {
1053                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
1054                                           l4proto->nla_policy, NULL);
1055                 if (ret == 0)
1056                         ret = l4proto->nlattr_to_tuple(tb, tuple);
1057         }
1058
1059         rcu_read_unlock();
1060
1061         return ret;
1062 }
1063
1064 static int
1065 ctnetlink_parse_zone(const struct nlattr *attr,
1066                      struct nf_conntrack_zone *zone)
1067 {
1068         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1069                         NF_CT_DEFAULT_ZONE_DIR, 0);
1070 #ifdef CONFIG_NF_CONNTRACK_ZONES
1071         if (attr)
1072                 zone->id = ntohs(nla_get_be16(attr));
1073 #else
1074         if (attr)
1075                 return -EOPNOTSUPP;
1076 #endif
1077         return 0;
1078 }
1079
1080 static int
1081 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1082                            struct nf_conntrack_zone *zone)
1083 {
1084         int ret;
1085
1086         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1087                 return -EINVAL;
1088
1089         ret = ctnetlink_parse_zone(attr, zone);
1090         if (ret < 0)
1091                 return ret;
1092
1093         if (type == CTA_TUPLE_REPLY)
1094                 zone->dir = NF_CT_ZONE_DIR_REPL;
1095         else
1096                 zone->dir = NF_CT_ZONE_DIR_ORIG;
1097
1098         return 0;
1099 }
1100
1101 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1102         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
1103         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
1104         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
1105 };
1106
1107 static int
1108 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1109                       struct nf_conntrack_tuple *tuple, u32 type,
1110                       u_int8_t l3num, struct nf_conntrack_zone *zone)
1111 {
1112         struct nlattr *tb[CTA_TUPLE_MAX+1];
1113         int err;
1114
1115         memset(tuple, 0, sizeof(*tuple));
1116
1117         err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy,
1118                                NULL);
1119         if (err < 0)
1120                 return err;
1121
1122         if (!tb[CTA_TUPLE_IP])
1123                 return -EINVAL;
1124
1125         if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1126                 return -EOPNOTSUPP;
1127         tuple->src.l3num = l3num;
1128
1129         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1130         if (err < 0)
1131                 return err;
1132
1133         if (!tb[CTA_TUPLE_PROTO])
1134                 return -EINVAL;
1135
1136         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1137         if (err < 0)
1138                 return err;
1139
1140         if (tb[CTA_TUPLE_ZONE]) {
1141                 if (!zone)
1142                         return -EINVAL;
1143
1144                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1145                                                  type, zone);
1146                 if (err < 0)
1147                         return err;
1148         }
1149
1150         /* orig and expect tuples get DIR_ORIGINAL */
1151         if (type == CTA_TUPLE_REPLY)
1152                 tuple->dst.dir = IP_CT_DIR_REPLY;
1153         else
1154                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1155
1156         return 0;
1157 }
1158
1159 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1160         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1161                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1162 };
1163
1164 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1165                                 struct nlattr **helpinfo)
1166 {
1167         int err;
1168         struct nlattr *tb[CTA_HELP_MAX+1];
1169
1170         err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy, NULL);
1171         if (err < 0)
1172                 return err;
1173
1174         if (!tb[CTA_HELP_NAME])
1175                 return -EINVAL;
1176
1177         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1178
1179         if (tb[CTA_HELP_INFO])
1180                 *helpinfo = tb[CTA_HELP_INFO];
1181
1182         return 0;
1183 }
1184
1185 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1186         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1187         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1188         [CTA_STATUS]            = { .type = NLA_U32 },
1189         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1190         [CTA_HELP]              = { .type = NLA_NESTED },
1191         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1192         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1193         [CTA_MARK]              = { .type = NLA_U32 },
1194         [CTA_ID]                = { .type = NLA_U32 },
1195         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1196         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1197         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1198         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1199         [CTA_ZONE]              = { .type = NLA_U16 },
1200         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1201         [CTA_LABELS]            = { .type = NLA_BINARY,
1202                                     .len = NF_CT_LABELS_MAX_SIZE },
1203         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1204                                     .len = NF_CT_LABELS_MAX_SIZE },
1205 };
1206
1207 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1208 {
1209         return ctnetlink_filter_match(ct, data);
1210 }
1211
1212 static int ctnetlink_flush_conntrack(struct net *net,
1213                                      const struct nlattr * const cda[],
1214                                      u32 portid, int report)
1215 {
1216         struct ctnetlink_filter *filter = NULL;
1217
1218         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1219                 filter = ctnetlink_alloc_filter(cda);
1220                 if (IS_ERR(filter))
1221                         return PTR_ERR(filter);
1222         }
1223
1224         nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1225                                   portid, report);
1226         kfree(filter);
1227
1228         return 0;
1229 }
1230
1231 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1232                                    struct sk_buff *skb,
1233                                    const struct nlmsghdr *nlh,
1234                                    const struct nlattr * const cda[],
1235                                    struct netlink_ext_ack *extack)
1236 {
1237         struct nf_conntrack_tuple_hash *h;
1238         struct nf_conntrack_tuple tuple;
1239         struct nf_conn *ct;
1240         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1241         u_int8_t u3 = nfmsg->nfgen_family;
1242         struct nf_conntrack_zone zone;
1243         int err;
1244
1245         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1246         if (err < 0)
1247                 return err;
1248
1249         if (cda[CTA_TUPLE_ORIG])
1250                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1251                                             u3, &zone);
1252         else if (cda[CTA_TUPLE_REPLY])
1253                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1254                                             u3, &zone);
1255         else {
1256                 return ctnetlink_flush_conntrack(net, cda,
1257                                                  NETLINK_CB(skb).portid,
1258                                                  nlmsg_report(nlh));
1259         }
1260
1261         if (err < 0)
1262                 return err;
1263
1264         h = nf_conntrack_find_get(net, &zone, &tuple);
1265         if (!h)
1266                 return -ENOENT;
1267
1268         ct = nf_ct_tuplehash_to_ctrack(h);
1269
1270         if (cda[CTA_ID]) {
1271                 __be32 id = nla_get_be32(cda[CTA_ID]);
1272
1273                 if (id != (__force __be32)nf_ct_get_id(ct)) {
1274                         nf_ct_put(ct);
1275                         return -ENOENT;
1276                 }
1277         }
1278
1279         nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1280         nf_ct_put(ct);
1281
1282         return 0;
1283 }
1284
1285 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1286                                    struct sk_buff *skb,
1287                                    const struct nlmsghdr *nlh,
1288                                    const struct nlattr * const cda[],
1289                                    struct netlink_ext_ack *extack)
1290 {
1291         struct nf_conntrack_tuple_hash *h;
1292         struct nf_conntrack_tuple tuple;
1293         struct nf_conn *ct;
1294         struct sk_buff *skb2 = NULL;
1295         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1296         u_int8_t u3 = nfmsg->nfgen_family;
1297         struct nf_conntrack_zone zone;
1298         int err;
1299
1300         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1301                 struct netlink_dump_control c = {
1302                         .start = ctnetlink_start,
1303                         .dump = ctnetlink_dump_table,
1304                         .done = ctnetlink_done,
1305                         .data = (void *)cda,
1306                 };
1307
1308                 return netlink_dump_start(ctnl, skb, nlh, &c);
1309         }
1310
1311         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1312         if (err < 0)
1313                 return err;
1314
1315         if (cda[CTA_TUPLE_ORIG])
1316                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1317                                             u3, &zone);
1318         else if (cda[CTA_TUPLE_REPLY])
1319                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1320                                             u3, &zone);
1321         else
1322                 return -EINVAL;
1323
1324         if (err < 0)
1325                 return err;
1326
1327         h = nf_conntrack_find_get(net, &zone, &tuple);
1328         if (!h)
1329                 return -ENOENT;
1330
1331         ct = nf_ct_tuplehash_to_ctrack(h);
1332
1333         err = -ENOMEM;
1334         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1335         if (skb2 == NULL) {
1336                 nf_ct_put(ct);
1337                 return -ENOMEM;
1338         }
1339
1340         rcu_read_lock();
1341         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1342                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1343         rcu_read_unlock();
1344         nf_ct_put(ct);
1345         if (err <= 0)
1346                 goto free;
1347
1348         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1349         if (err < 0)
1350                 goto out;
1351
1352         return 0;
1353
1354 free:
1355         kfree_skb(skb2);
1356 out:
1357         /* this avoids a loop in nfnetlink. */
1358         return err == -EAGAIN ? -ENOBUFS : err;
1359 }
1360
1361 static int ctnetlink_done_list(struct netlink_callback *cb)
1362 {
1363         if (cb->args[1])
1364                 nf_ct_put((struct nf_conn *)cb->args[1]);
1365         return 0;
1366 }
1367
1368 static int
1369 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1370 {
1371         struct nf_conn *ct, *last;
1372         struct nf_conntrack_tuple_hash *h;
1373         struct hlist_nulls_node *n;
1374         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1375         u_int8_t l3proto = nfmsg->nfgen_family;
1376         int res;
1377         int cpu;
1378         struct hlist_nulls_head *list;
1379         struct net *net = sock_net(skb->sk);
1380
1381         if (cb->args[2])
1382                 return 0;
1383
1384         last = (struct nf_conn *)cb->args[1];
1385
1386         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1387                 struct ct_pcpu *pcpu;
1388
1389                 if (!cpu_possible(cpu))
1390                         continue;
1391
1392                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1393                 spin_lock_bh(&pcpu->lock);
1394                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1395 restart:
1396                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1397                         ct = nf_ct_tuplehash_to_ctrack(h);
1398                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1399                                 continue;
1400                         if (cb->args[1]) {
1401                                 if (ct != last)
1402                                         continue;
1403                                 cb->args[1] = 0;
1404                         }
1405                         rcu_read_lock();
1406                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1407                                                   cb->nlh->nlmsg_seq,
1408                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1409                                                   ct);
1410                         rcu_read_unlock();
1411                         if (res < 0) {
1412                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1413                                         continue;
1414                                 cb->args[0] = cpu;
1415                                 cb->args[1] = (unsigned long)ct;
1416                                 spin_unlock_bh(&pcpu->lock);
1417                                 goto out;
1418                         }
1419                 }
1420                 if (cb->args[1]) {
1421                         cb->args[1] = 0;
1422                         goto restart;
1423                 }
1424                 spin_unlock_bh(&pcpu->lock);
1425         }
1426         cb->args[2] = 1;
1427 out:
1428         if (last)
1429                 nf_ct_put(last);
1430
1431         return skb->len;
1432 }
1433
1434 static int
1435 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1436 {
1437         return ctnetlink_dump_list(skb, cb, true);
1438 }
1439
1440 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1441                                   struct sk_buff *skb,
1442                                   const struct nlmsghdr *nlh,
1443                                   const struct nlattr * const cda[],
1444                                   struct netlink_ext_ack *extack)
1445 {
1446         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1447                 struct netlink_dump_control c = {
1448                         .dump = ctnetlink_dump_dying,
1449                         .done = ctnetlink_done_list,
1450                 };
1451                 return netlink_dump_start(ctnl, skb, nlh, &c);
1452         }
1453
1454         return -EOPNOTSUPP;
1455 }
1456
1457 static int
1458 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1459 {
1460         return ctnetlink_dump_list(skb, cb, false);
1461 }
1462
1463 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1464                                         struct sk_buff *skb,
1465                                         const struct nlmsghdr *nlh,
1466                                         const struct nlattr * const cda[],
1467                                         struct netlink_ext_ack *extack)
1468 {
1469         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1470                 struct netlink_dump_control c = {
1471                         .dump = ctnetlink_dump_unconfirmed,
1472                         .done = ctnetlink_done_list,
1473                 };
1474                 return netlink_dump_start(ctnl, skb, nlh, &c);
1475         }
1476
1477         return -EOPNOTSUPP;
1478 }
1479
1480 #ifdef CONFIG_NF_NAT_NEEDED
1481 static int
1482 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1483                           enum nf_nat_manip_type manip,
1484                           const struct nlattr *attr)
1485 {
1486         struct nf_nat_hook *nat_hook;
1487         int err;
1488
1489         nat_hook = rcu_dereference(nf_nat_hook);
1490         if (!nat_hook) {
1491 #ifdef CONFIG_MODULES
1492                 rcu_read_unlock();
1493                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1494                 if (request_module("nf-nat") < 0) {
1495                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1496                         rcu_read_lock();
1497                         return -EOPNOTSUPP;
1498                 }
1499                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1500                 rcu_read_lock();
1501                 nat_hook = rcu_dereference(nf_nat_hook);
1502                 if (nat_hook)
1503                         return -EAGAIN;
1504 #endif
1505                 return -EOPNOTSUPP;
1506         }
1507
1508         err = nat_hook->parse_nat_setup(ct, manip, attr);
1509         if (err == -EAGAIN) {
1510 #ifdef CONFIG_MODULES
1511                 rcu_read_unlock();
1512                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1513                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1514                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1515                         rcu_read_lock();
1516                         return -EOPNOTSUPP;
1517                 }
1518                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1519                 rcu_read_lock();
1520 #else
1521                 err = -EOPNOTSUPP;
1522 #endif
1523         }
1524         return err;
1525 }
1526 #endif
1527
1528 static void
1529 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1530                           unsigned long off)
1531 {
1532         unsigned int bit;
1533
1534         /* Ignore these unchangable bits */
1535         on &= ~IPS_UNCHANGEABLE_MASK;
1536         off &= ~IPS_UNCHANGEABLE_MASK;
1537
1538         for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1539                 if (on & (1 << bit))
1540                         set_bit(bit, &ct->status);
1541                 else if (off & (1 << bit))
1542                         clear_bit(bit, &ct->status);
1543         }
1544 }
1545
1546 static int
1547 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1548 {
1549         unsigned long d;
1550         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1551         d = ct->status ^ status;
1552
1553         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1554                 /* unchangeable */
1555                 return -EBUSY;
1556
1557         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1558                 /* SEEN_REPLY bit can only be set */
1559                 return -EBUSY;
1560
1561         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1562                 /* ASSURED bit can only be set */
1563                 return -EBUSY;
1564
1565         __ctnetlink_change_status(ct, status, 0);
1566         return 0;
1567 }
1568
1569 static int
1570 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1571 {
1572 #ifdef CONFIG_NF_NAT_NEEDED
1573         int ret;
1574
1575         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1576                 return 0;
1577
1578         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1579                                         cda[CTA_NAT_DST]);
1580         if (ret < 0)
1581                 return ret;
1582
1583         return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1584                                          cda[CTA_NAT_SRC]);
1585 #else
1586         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1587                 return 0;
1588         return -EOPNOTSUPP;
1589 #endif
1590 }
1591
1592 static int ctnetlink_change_helper(struct nf_conn *ct,
1593                                    const struct nlattr * const cda[])
1594 {
1595         struct nf_conntrack_helper *helper;
1596         struct nf_conn_help *help = nfct_help(ct);
1597         char *helpname = NULL;
1598         struct nlattr *helpinfo = NULL;
1599         int err;
1600
1601         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1602         if (err < 0)
1603                 return err;
1604
1605         /* don't change helper of sibling connections */
1606         if (ct->master) {
1607                 /* If we try to change the helper to the same thing twice,
1608                  * treat the second attempt as a no-op instead of returning
1609                  * an error.
1610                  */
1611                 err = -EBUSY;
1612                 if (help) {
1613                         rcu_read_lock();
1614                         helper = rcu_dereference(help->helper);
1615                         if (helper && !strcmp(helper->name, helpname))
1616                                 err = 0;
1617                         rcu_read_unlock();
1618                 }
1619
1620                 return err;
1621         }
1622
1623         if (!strcmp(helpname, "")) {
1624                 if (help && help->helper) {
1625                         /* we had a helper before ... */
1626                         nf_ct_remove_expectations(ct);
1627                         RCU_INIT_POINTER(help->helper, NULL);
1628                 }
1629
1630                 return 0;
1631         }
1632
1633         rcu_read_lock();
1634         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1635                                             nf_ct_protonum(ct));
1636         if (helper == NULL) {
1637                 rcu_read_unlock();
1638                 return -EOPNOTSUPP;
1639         }
1640
1641         if (help) {
1642                 if (help->helper == helper) {
1643                         /* update private helper data if allowed. */
1644                         if (helper->from_nlattr)
1645                                 helper->from_nlattr(helpinfo, ct);
1646                         err = 0;
1647                 } else
1648                         err = -EBUSY;
1649         } else {
1650                 /* we cannot set a helper for an existing conntrack */
1651                 err = -EOPNOTSUPP;
1652         }
1653
1654         rcu_read_unlock();
1655         return err;
1656 }
1657
1658 static int ctnetlink_change_timeout(struct nf_conn *ct,
1659                                     const struct nlattr * const cda[])
1660 {
1661         u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1662
1663         if (timeout > INT_MAX)
1664                 timeout = INT_MAX;
1665         ct->timeout = nfct_time_stamp + (u32)timeout;
1666
1667         if (test_bit(IPS_DYING_BIT, &ct->status))
1668                 return -ETIME;
1669
1670         return 0;
1671 }
1672
1673 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1674         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1675         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1676         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1677 };
1678
1679 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1680                                       const struct nlattr * const cda[])
1681 {
1682         const struct nlattr *attr = cda[CTA_PROTOINFO];
1683         const struct nf_conntrack_l4proto *l4proto;
1684         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1685         int err = 0;
1686
1687         err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy,
1688                                NULL);
1689         if (err < 0)
1690                 return err;
1691
1692         rcu_read_lock();
1693         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1694         if (l4proto->from_nlattr)
1695                 err = l4proto->from_nlattr(tb, ct);
1696         rcu_read_unlock();
1697
1698         return err;
1699 }
1700
1701 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1702         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1703         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1704         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1705 };
1706
1707 static int change_seq_adj(struct nf_ct_seqadj *seq,
1708                           const struct nlattr * const attr)
1709 {
1710         int err;
1711         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1712
1713         err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy, NULL);
1714         if (err < 0)
1715                 return err;
1716
1717         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1718                 return -EINVAL;
1719
1720         seq->correction_pos =
1721                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1722
1723         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1724                 return -EINVAL;
1725
1726         seq->offset_before =
1727                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1728
1729         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1730                 return -EINVAL;
1731
1732         seq->offset_after =
1733                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1734
1735         return 0;
1736 }
1737
1738 static int
1739 ctnetlink_change_seq_adj(struct nf_conn *ct,
1740                          const struct nlattr * const cda[])
1741 {
1742         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1743         int ret = 0;
1744
1745         if (!seqadj)
1746                 return 0;
1747
1748         spin_lock_bh(&ct->lock);
1749         if (cda[CTA_SEQ_ADJ_ORIG]) {
1750                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1751                                      cda[CTA_SEQ_ADJ_ORIG]);
1752                 if (ret < 0)
1753                         goto err;
1754
1755                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1756         }
1757
1758         if (cda[CTA_SEQ_ADJ_REPLY]) {
1759                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1760                                      cda[CTA_SEQ_ADJ_REPLY]);
1761                 if (ret < 0)
1762                         goto err;
1763
1764                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1765         }
1766
1767         spin_unlock_bh(&ct->lock);
1768         return 0;
1769 err:
1770         spin_unlock_bh(&ct->lock);
1771         return ret;
1772 }
1773
1774 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1775         [CTA_SYNPROXY_ISN]      = { .type = NLA_U32 },
1776         [CTA_SYNPROXY_ITS]      = { .type = NLA_U32 },
1777         [CTA_SYNPROXY_TSOFF]    = { .type = NLA_U32 },
1778 };
1779
1780 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1781                                      const struct nlattr * const cda[])
1782 {
1783         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1784         struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1785         int err;
1786
1787         if (!synproxy)
1788                 return 0;
1789
1790         err = nla_parse_nested(tb, CTA_SYNPROXY_MAX, cda[CTA_SYNPROXY],
1791                                synproxy_policy, NULL);
1792         if (err < 0)
1793                 return err;
1794
1795         if (!tb[CTA_SYNPROXY_ISN] ||
1796             !tb[CTA_SYNPROXY_ITS] ||
1797             !tb[CTA_SYNPROXY_TSOFF])
1798                 return -EINVAL;
1799
1800         synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1801         synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1802         synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1803
1804         return 0;
1805 }
1806
1807 static int
1808 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1809 {
1810 #ifdef CONFIG_NF_CONNTRACK_LABELS
1811         size_t len = nla_len(cda[CTA_LABELS]);
1812         const void *mask = cda[CTA_LABELS_MASK];
1813
1814         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1815                 return -EINVAL;
1816
1817         if (mask) {
1818                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1819                     nla_len(cda[CTA_LABELS_MASK]) != len)
1820                         return -EINVAL;
1821                 mask = nla_data(cda[CTA_LABELS_MASK]);
1822         }
1823
1824         len /= sizeof(u32);
1825
1826         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1827 #else
1828         return -EOPNOTSUPP;
1829 #endif
1830 }
1831
1832 static int
1833 ctnetlink_change_conntrack(struct nf_conn *ct,
1834                            const struct nlattr * const cda[])
1835 {
1836         int err;
1837
1838         /* only allow NAT changes and master assignation for new conntracks */
1839         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1840                 return -EOPNOTSUPP;
1841
1842         if (cda[CTA_HELP]) {
1843                 err = ctnetlink_change_helper(ct, cda);
1844                 if (err < 0)
1845                         return err;
1846         }
1847
1848         if (cda[CTA_TIMEOUT]) {
1849                 err = ctnetlink_change_timeout(ct, cda);
1850                 if (err < 0)
1851                         return err;
1852         }
1853
1854         if (cda[CTA_STATUS]) {
1855                 err = ctnetlink_change_status(ct, cda);
1856                 if (err < 0)
1857                         return err;
1858         }
1859
1860         if (cda[CTA_PROTOINFO]) {
1861                 err = ctnetlink_change_protoinfo(ct, cda);
1862                 if (err < 0)
1863                         return err;
1864         }
1865
1866 #if defined(CONFIG_NF_CONNTRACK_MARK)
1867         if (cda[CTA_MARK])
1868                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1869 #endif
1870
1871         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1872                 err = ctnetlink_change_seq_adj(ct, cda);
1873                 if (err < 0)
1874                         return err;
1875         }
1876
1877         if (cda[CTA_SYNPROXY]) {
1878                 err = ctnetlink_change_synproxy(ct, cda);
1879                 if (err < 0)
1880                         return err;
1881         }
1882
1883         if (cda[CTA_LABELS]) {
1884                 err = ctnetlink_attach_labels(ct, cda);
1885                 if (err < 0)
1886                         return err;
1887         }
1888
1889         return 0;
1890 }
1891
1892 static struct nf_conn *
1893 ctnetlink_create_conntrack(struct net *net,
1894                            const struct nf_conntrack_zone *zone,
1895                            const struct nlattr * const cda[],
1896                            struct nf_conntrack_tuple *otuple,
1897                            struct nf_conntrack_tuple *rtuple,
1898                            u8 u3)
1899 {
1900         struct nf_conn *ct;
1901         int err = -EINVAL;
1902         struct nf_conntrack_helper *helper;
1903         struct nf_conn_tstamp *tstamp;
1904         u64 timeout;
1905
1906         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1907         if (IS_ERR(ct))
1908                 return ERR_PTR(-ENOMEM);
1909
1910         if (!cda[CTA_TIMEOUT])
1911                 goto err1;
1912
1913         timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1914         if (timeout > INT_MAX)
1915                 timeout = INT_MAX;
1916         ct->timeout = (u32)timeout + nfct_time_stamp;
1917
1918         rcu_read_lock();
1919         if (cda[CTA_HELP]) {
1920                 char *helpname = NULL;
1921                 struct nlattr *helpinfo = NULL;
1922
1923                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1924                 if (err < 0)
1925                         goto err2;
1926
1927                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1928                                                     nf_ct_protonum(ct));
1929                 if (helper == NULL) {
1930                         rcu_read_unlock();
1931 #ifdef CONFIG_MODULES
1932                         if (request_module("nfct-helper-%s", helpname) < 0) {
1933                                 err = -EOPNOTSUPP;
1934                                 goto err1;
1935                         }
1936
1937                         rcu_read_lock();
1938                         helper = __nf_conntrack_helper_find(helpname,
1939                                                             nf_ct_l3num(ct),
1940                                                             nf_ct_protonum(ct));
1941                         if (helper) {
1942                                 err = -EAGAIN;
1943                                 goto err2;
1944                         }
1945                         rcu_read_unlock();
1946 #endif
1947                         err = -EOPNOTSUPP;
1948                         goto err1;
1949                 } else {
1950                         struct nf_conn_help *help;
1951
1952                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1953                         if (help == NULL) {
1954                                 err = -ENOMEM;
1955                                 goto err2;
1956                         }
1957                         /* set private helper data if allowed. */
1958                         if (helper->from_nlattr)
1959                                 helper->from_nlattr(helpinfo, ct);
1960
1961                         /* not in hash table yet so not strictly necessary */
1962                         RCU_INIT_POINTER(help->helper, helper);
1963                 }
1964         } else {
1965                 /* try an implicit helper assignation */
1966                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1967                 if (err < 0)
1968                         goto err2;
1969         }
1970
1971         err = ctnetlink_setup_nat(ct, cda);
1972         if (err < 0)
1973                 goto err2;
1974
1975         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1976         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1977         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1978         nf_ct_labels_ext_add(ct);
1979         nfct_seqadj_ext_add(ct);
1980         nfct_synproxy_ext_add(ct);
1981
1982         /* we must add conntrack extensions before confirmation. */
1983         ct->status |= IPS_CONFIRMED;
1984
1985         if (cda[CTA_STATUS]) {
1986                 err = ctnetlink_change_status(ct, cda);
1987                 if (err < 0)
1988                         goto err2;
1989         }
1990
1991         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1992                 err = ctnetlink_change_seq_adj(ct, cda);
1993                 if (err < 0)
1994                         goto err2;
1995         }
1996
1997         memset(&ct->proto, 0, sizeof(ct->proto));
1998         if (cda[CTA_PROTOINFO]) {
1999                 err = ctnetlink_change_protoinfo(ct, cda);
2000                 if (err < 0)
2001                         goto err2;
2002         }
2003
2004         if (cda[CTA_SYNPROXY]) {
2005                 err = ctnetlink_change_synproxy(ct, cda);
2006                 if (err < 0)
2007                         goto err2;
2008         }
2009
2010 #if defined(CONFIG_NF_CONNTRACK_MARK)
2011         if (cda[CTA_MARK])
2012                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2013 #endif
2014
2015         /* setup master conntrack: this is a confirmed expectation */
2016         if (cda[CTA_TUPLE_MASTER]) {
2017                 struct nf_conntrack_tuple master;
2018                 struct nf_conntrack_tuple_hash *master_h;
2019                 struct nf_conn *master_ct;
2020
2021                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2022                                             u3, NULL);
2023                 if (err < 0)
2024                         goto err2;
2025
2026                 master_h = nf_conntrack_find_get(net, zone, &master);
2027                 if (master_h == NULL) {
2028                         err = -ENOENT;
2029                         goto err2;
2030                 }
2031                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2032                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2033                 ct->master = master_ct;
2034         }
2035         tstamp = nf_conn_tstamp_find(ct);
2036         if (tstamp)
2037                 tstamp->start = ktime_get_real_ns();
2038
2039         err = nf_conntrack_hash_check_insert(ct);
2040         if (err < 0)
2041                 goto err3;
2042
2043         rcu_read_unlock();
2044
2045         return ct;
2046
2047 err3:
2048         if (ct->master)
2049                 nf_ct_put(ct->master);
2050 err2:
2051         rcu_read_unlock();
2052 err1:
2053         nf_conntrack_free(ct);
2054         return ERR_PTR(err);
2055 }
2056
2057 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2058                                    struct sk_buff *skb,
2059                                    const struct nlmsghdr *nlh,
2060                                    const struct nlattr * const cda[],
2061                                    struct netlink_ext_ack *extack)
2062 {
2063         struct nf_conntrack_tuple otuple, rtuple;
2064         struct nf_conntrack_tuple_hash *h = NULL;
2065         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2066         struct nf_conn *ct;
2067         u_int8_t u3 = nfmsg->nfgen_family;
2068         struct nf_conntrack_zone zone;
2069         int err;
2070
2071         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2072         if (err < 0)
2073                 return err;
2074
2075         if (cda[CTA_TUPLE_ORIG]) {
2076                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2077                                             u3, &zone);
2078                 if (err < 0)
2079                         return err;
2080         }
2081
2082         if (cda[CTA_TUPLE_REPLY]) {
2083                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2084                                             u3, &zone);
2085                 if (err < 0)
2086                         return err;
2087         }
2088
2089         if (cda[CTA_TUPLE_ORIG])
2090                 h = nf_conntrack_find_get(net, &zone, &otuple);
2091         else if (cda[CTA_TUPLE_REPLY])
2092                 h = nf_conntrack_find_get(net, &zone, &rtuple);
2093
2094         if (h == NULL) {
2095                 err = -ENOENT;
2096                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2097                         enum ip_conntrack_events events;
2098
2099                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2100                                 return -EINVAL;
2101                         if (otuple.dst.protonum != rtuple.dst.protonum)
2102                                 return -EINVAL;
2103
2104                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2105                                                         &rtuple, u3);
2106                         if (IS_ERR(ct))
2107                                 return PTR_ERR(ct);
2108
2109                         err = 0;
2110                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2111                                 events = 1 << IPCT_RELATED;
2112                         else
2113                                 events = 1 << IPCT_NEW;
2114
2115                         if (cda[CTA_LABELS] &&
2116                             ctnetlink_attach_labels(ct, cda) == 0)
2117                                 events |= (1 << IPCT_LABEL);
2118
2119                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2120                                                       (1 << IPCT_ASSURED) |
2121                                                       (1 << IPCT_HELPER) |
2122                                                       (1 << IPCT_PROTOINFO) |
2123                                                       (1 << IPCT_SEQADJ) |
2124                                                       (1 << IPCT_MARK) |
2125                                                       (1 << IPCT_SYNPROXY) |
2126                                                       events,
2127                                                       ct, NETLINK_CB(skb).portid,
2128                                                       nlmsg_report(nlh));
2129                         nf_ct_put(ct);
2130                 }
2131
2132                 return err;
2133         }
2134         /* implicit 'else' */
2135
2136         err = -EEXIST;
2137         ct = nf_ct_tuplehash_to_ctrack(h);
2138         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2139                 err = ctnetlink_change_conntrack(ct, cda);
2140                 if (err == 0) {
2141                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2142                                                       (1 << IPCT_ASSURED) |
2143                                                       (1 << IPCT_HELPER) |
2144                                                       (1 << IPCT_LABEL) |
2145                                                       (1 << IPCT_PROTOINFO) |
2146                                                       (1 << IPCT_SEQADJ) |
2147                                                       (1 << IPCT_MARK) |
2148                                                       (1 << IPCT_SYNPROXY),
2149                                                       ct, NETLINK_CB(skb).portid,
2150                                                       nlmsg_report(nlh));
2151                 }
2152         }
2153
2154         nf_ct_put(ct);
2155         return err;
2156 }
2157
2158 static int
2159 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2160                                 __u16 cpu, const struct ip_conntrack_stat *st)
2161 {
2162         struct nlmsghdr *nlh;
2163         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2164
2165         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2166                               IPCTNL_MSG_CT_GET_STATS_CPU);
2167         nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2168                            NFNETLINK_V0, htons(cpu));
2169         if (!nlh)
2170                 goto nlmsg_failure;
2171
2172         if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2173             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2174             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2175             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2176             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2177                                 htonl(st->insert_failed)) ||
2178             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2179             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2180             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2181             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2182                                 htonl(st->search_restart)))
2183                 goto nla_put_failure;
2184
2185         nlmsg_end(skb, nlh);
2186         return skb->len;
2187
2188 nla_put_failure:
2189 nlmsg_failure:
2190         nlmsg_cancel(skb, nlh);
2191         return -1;
2192 }
2193
2194 static int
2195 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2196 {
2197         int cpu;
2198         struct net *net = sock_net(skb->sk);
2199
2200         if (cb->args[0] == nr_cpu_ids)
2201                 return 0;
2202
2203         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2204                 const struct ip_conntrack_stat *st;
2205
2206                 if (!cpu_possible(cpu))
2207                         continue;
2208
2209                 st = per_cpu_ptr(net->ct.stat, cpu);
2210                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2211                                                     NETLINK_CB(cb->skb).portid,
2212                                                     cb->nlh->nlmsg_seq,
2213                                                     cpu, st) < 0)
2214                                 break;
2215         }
2216         cb->args[0] = cpu;
2217
2218         return skb->len;
2219 }
2220
2221 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2222                                  struct sk_buff *skb,
2223                                  const struct nlmsghdr *nlh,
2224                                  const struct nlattr * const cda[],
2225                                  struct netlink_ext_ack *extack)
2226 {
2227         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2228                 struct netlink_dump_control c = {
2229                         .dump = ctnetlink_ct_stat_cpu_dump,
2230                 };
2231                 return netlink_dump_start(ctnl, skb, nlh, &c);
2232         }
2233
2234         return 0;
2235 }
2236
2237 static int
2238 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2239                             struct net *net)
2240 {
2241         struct nlmsghdr *nlh;
2242         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2243         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2244
2245         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2246         nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
2247                            NFNETLINK_V0, 0);
2248         if (!nlh)
2249                 goto nlmsg_failure;
2250
2251         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2252                 goto nla_put_failure;
2253
2254         if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2255                 goto nla_put_failure;
2256
2257         nlmsg_end(skb, nlh);
2258         return skb->len;
2259
2260 nla_put_failure:
2261 nlmsg_failure:
2262         nlmsg_cancel(skb, nlh);
2263         return -1;
2264 }
2265
2266 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2267                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2268                              const struct nlattr * const cda[],
2269                              struct netlink_ext_ack *extack)
2270 {
2271         struct sk_buff *skb2;
2272         int err;
2273
2274         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2275         if (skb2 == NULL)
2276                 return -ENOMEM;
2277
2278         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2279                                           nlh->nlmsg_seq,
2280                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2281                                           sock_net(skb->sk));
2282         if (err <= 0)
2283                 goto free;
2284
2285         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2286         if (err < 0)
2287                 goto out;
2288
2289         return 0;
2290
2291 free:
2292         kfree_skb(skb2);
2293 out:
2294         /* this avoids a loop in nfnetlink. */
2295         return err == -EAGAIN ? -ENOBUFS : err;
2296 }
2297
2298 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2299         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2300         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2301         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2302         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2303         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2304         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2305                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2306         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2307         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2308         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2309         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2310         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2311 };
2312
2313 static struct nf_conntrack_expect *
2314 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2315                        struct nf_conntrack_helper *helper,
2316                        struct nf_conntrack_tuple *tuple,
2317                        struct nf_conntrack_tuple *mask);
2318
2319 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2320 static size_t
2321 ctnetlink_glue_build_size(const struct nf_conn *ct)
2322 {
2323         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2324                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2325                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2326                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2327                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2328                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2329                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2330                + nla_total_size(0) /* CTA_PROTOINFO */
2331                + nla_total_size(0) /* CTA_HELP */
2332                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2333                + ctnetlink_secctx_size(ct)
2334 #ifdef CONFIG_NF_NAT_NEEDED
2335                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2336                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2337 #endif
2338 #ifdef CONFIG_NF_CONNTRACK_MARK
2339                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2340 #endif
2341 #ifdef CONFIG_NF_CONNTRACK_ZONES
2342                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2343 #endif
2344                + ctnetlink_proto_size(ct)
2345                ;
2346 }
2347
2348 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2349                                              enum ip_conntrack_info *ctinfo)
2350 {
2351         return nf_ct_get(skb, ctinfo);
2352 }
2353
2354 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2355 {
2356         const struct nf_conntrack_zone *zone;
2357         struct nlattr *nest_parms;
2358
2359         zone = nf_ct_zone(ct);
2360
2361         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2362         if (!nest_parms)
2363                 goto nla_put_failure;
2364         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2365                 goto nla_put_failure;
2366         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2367                                    NF_CT_ZONE_DIR_ORIG) < 0)
2368                 goto nla_put_failure;
2369         nla_nest_end(skb, nest_parms);
2370
2371         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2372         if (!nest_parms)
2373                 goto nla_put_failure;
2374         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2375                 goto nla_put_failure;
2376         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2377                                    NF_CT_ZONE_DIR_REPL) < 0)
2378                 goto nla_put_failure;
2379         nla_nest_end(skb, nest_parms);
2380
2381         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2382                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2383                 goto nla_put_failure;
2384
2385         if (ctnetlink_dump_id(skb, ct) < 0)
2386                 goto nla_put_failure;
2387
2388         if (ctnetlink_dump_status(skb, ct) < 0)
2389                 goto nla_put_failure;
2390
2391         if (ctnetlink_dump_timeout(skb, ct) < 0)
2392                 goto nla_put_failure;
2393
2394         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2395                 goto nla_put_failure;
2396
2397         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2398                 goto nla_put_failure;
2399
2400 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2401         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2402                 goto nla_put_failure;
2403 #endif
2404         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2405                 goto nla_put_failure;
2406
2407         if ((ct->status & IPS_SEQ_ADJUST) &&
2408             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2409                 goto nla_put_failure;
2410
2411         if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2412                 goto nla_put_failure;
2413
2414 #ifdef CONFIG_NF_CONNTRACK_MARK
2415         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2416                 goto nla_put_failure;
2417 #endif
2418         if (ctnetlink_dump_labels(skb, ct) < 0)
2419                 goto nla_put_failure;
2420         return 0;
2421
2422 nla_put_failure:
2423         return -ENOSPC;
2424 }
2425
2426 static int
2427 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2428                      enum ip_conntrack_info ctinfo,
2429                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2430 {
2431         struct nlattr *nest_parms;
2432
2433         nest_parms = nla_nest_start(skb, ct_attr | NLA_F_NESTED);
2434         if (!nest_parms)
2435                 goto nla_put_failure;
2436
2437         if (__ctnetlink_glue_build(skb, ct) < 0)
2438                 goto nla_put_failure;
2439
2440         nla_nest_end(skb, nest_parms);
2441
2442         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2443                 goto nla_put_failure;
2444
2445         return 0;
2446
2447 nla_put_failure:
2448         return -ENOSPC;
2449 }
2450
2451 static int
2452 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2453 {
2454         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2455         unsigned long d = ct->status ^ status;
2456
2457         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2458                 /* SEEN_REPLY bit can only be set */
2459                 return -EBUSY;
2460
2461         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2462                 /* ASSURED bit can only be set */
2463                 return -EBUSY;
2464
2465         /* This check is less strict than ctnetlink_change_status()
2466          * because callers often flip IPS_EXPECTED bits when sending
2467          * an NFQA_CT attribute to the kernel.  So ignore the
2468          * unchangeable bits but do not error out. Also user programs
2469          * are allowed to clear the bits that they are allowed to change.
2470          */
2471         __ctnetlink_change_status(ct, status, ~status);
2472         return 0;
2473 }
2474
2475 static int
2476 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2477 {
2478         int err;
2479
2480         if (cda[CTA_TIMEOUT]) {
2481                 err = ctnetlink_change_timeout(ct, cda);
2482                 if (err < 0)
2483                         return err;
2484         }
2485         if (cda[CTA_STATUS]) {
2486                 err = ctnetlink_update_status(ct, cda);
2487                 if (err < 0)
2488                         return err;
2489         }
2490         if (cda[CTA_HELP]) {
2491                 err = ctnetlink_change_helper(ct, cda);
2492                 if (err < 0)
2493                         return err;
2494         }
2495         if (cda[CTA_LABELS]) {
2496                 err = ctnetlink_attach_labels(ct, cda);
2497                 if (err < 0)
2498                         return err;
2499         }
2500 #if defined(CONFIG_NF_CONNTRACK_MARK)
2501         if (cda[CTA_MARK]) {
2502                 u32 mask = 0, mark, newmark;
2503                 if (cda[CTA_MARK_MASK])
2504                         mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2505
2506                 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2507                 newmark = (ct->mark & mask) ^ mark;
2508                 if (newmark != ct->mark)
2509                         ct->mark = newmark;
2510         }
2511 #endif
2512         return 0;
2513 }
2514
2515 static int
2516 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2517 {
2518         struct nlattr *cda[CTA_MAX+1];
2519         int ret;
2520
2521         ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy, NULL);
2522         if (ret < 0)
2523                 return ret;
2524
2525         return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2526 }
2527
2528 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2529                                     const struct nf_conn *ct,
2530                                     struct nf_conntrack_tuple *tuple,
2531                                     struct nf_conntrack_tuple *mask)
2532 {
2533         int err;
2534
2535         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2536                                     nf_ct_l3num(ct), NULL);
2537         if (err < 0)
2538                 return err;
2539
2540         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2541                                      nf_ct_l3num(ct), NULL);
2542 }
2543
2544 static int
2545 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2546                              u32 portid, u32 report)
2547 {
2548         struct nlattr *cda[CTA_EXPECT_MAX+1];
2549         struct nf_conntrack_tuple tuple, mask;
2550         struct nf_conntrack_helper *helper = NULL;
2551         struct nf_conntrack_expect *exp;
2552         int err;
2553
2554         err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy,
2555                                NULL);
2556         if (err < 0)
2557                 return err;
2558
2559         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2560                                        ct, &tuple, &mask);
2561         if (err < 0)
2562                 return err;
2563
2564         if (cda[CTA_EXPECT_HELP_NAME]) {
2565                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2566
2567                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2568                                                     nf_ct_protonum(ct));
2569                 if (helper == NULL)
2570                         return -EOPNOTSUPP;
2571         }
2572
2573         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2574                                      helper, &tuple, &mask);
2575         if (IS_ERR(exp))
2576                 return PTR_ERR(exp);
2577
2578         err = nf_ct_expect_related_report(exp, portid, report);
2579         nf_ct_expect_put(exp);
2580         return err;
2581 }
2582
2583 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2584                                   enum ip_conntrack_info ctinfo, int diff)
2585 {
2586         if (!(ct->status & IPS_NAT_MASK))
2587                 return;
2588
2589         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2590 }
2591
2592 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2593         .get_ct         = ctnetlink_glue_get_ct,
2594         .build_size     = ctnetlink_glue_build_size,
2595         .build          = ctnetlink_glue_build,
2596         .parse          = ctnetlink_glue_parse,
2597         .attach_expect  = ctnetlink_glue_attach_expect,
2598         .seq_adjust     = ctnetlink_glue_seqadj,
2599 };
2600 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2601
2602 /***********************************************************************
2603  * EXPECT
2604  ***********************************************************************/
2605
2606 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2607                                     const struct nf_conntrack_tuple *tuple,
2608                                     u32 type)
2609 {
2610         struct nlattr *nest_parms;
2611
2612         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2613         if (!nest_parms)
2614                 goto nla_put_failure;
2615         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2616                 goto nla_put_failure;
2617         nla_nest_end(skb, nest_parms);
2618
2619         return 0;
2620
2621 nla_put_failure:
2622         return -1;
2623 }
2624
2625 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2626                                    const struct nf_conntrack_tuple *tuple,
2627                                    const struct nf_conntrack_tuple_mask *mask)
2628 {
2629         const struct nf_conntrack_l4proto *l4proto;
2630         struct nf_conntrack_tuple m;
2631         struct nlattr *nest_parms;
2632         int ret;
2633
2634         memset(&m, 0xFF, sizeof(m));
2635         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2636         m.src.u.all = mask->src.u.all;
2637         m.src.l3num = tuple->src.l3num;
2638         m.dst.protonum = tuple->dst.protonum;
2639
2640         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2641         if (!nest_parms)
2642                 goto nla_put_failure;
2643
2644         rcu_read_lock();
2645         ret = ctnetlink_dump_tuples_ip(skb, &m);
2646         if (ret >= 0) {
2647                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2648                                                tuple->dst.protonum);
2649         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2650         }
2651         rcu_read_unlock();
2652
2653         if (unlikely(ret < 0))
2654                 goto nla_put_failure;
2655
2656         nla_nest_end(skb, nest_parms);
2657
2658         return 0;
2659
2660 nla_put_failure:
2661         return -1;
2662 }
2663
2664 #if IS_ENABLED(CONFIG_NF_NAT)
2665 static const union nf_inet_addr any_addr;
2666 #endif
2667
2668 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2669 {
2670         static __read_mostly siphash_key_t exp_id_seed;
2671         unsigned long a, b, c, d;
2672
2673         net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2674
2675         a = (unsigned long)exp;
2676         b = (unsigned long)exp->helper;
2677         c = (unsigned long)exp->master;
2678         d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2679
2680 #ifdef CONFIG_64BIT
2681         return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2682 #else
2683         return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2684 #endif
2685 }
2686
2687 static int
2688 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2689                           const struct nf_conntrack_expect *exp)
2690 {
2691         struct nf_conn *master = exp->master;
2692         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2693         struct nf_conn_help *help;
2694 #ifdef CONFIG_NF_NAT_NEEDED
2695         struct nlattr *nest_parms;
2696         struct nf_conntrack_tuple nat_tuple = {};
2697 #endif
2698         struct nf_ct_helper_expectfn *expfn;
2699
2700         if (timeout < 0)
2701                 timeout = 0;
2702
2703         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2704                 goto nla_put_failure;
2705         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2706                 goto nla_put_failure;
2707         if (ctnetlink_exp_dump_tuple(skb,
2708                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2709                                  CTA_EXPECT_MASTER) < 0)
2710                 goto nla_put_failure;
2711
2712 #ifdef CONFIG_NF_NAT_NEEDED
2713         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2714             exp->saved_proto.all) {
2715                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2716                 if (!nest_parms)
2717                         goto nla_put_failure;
2718
2719                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2720                         goto nla_put_failure;
2721
2722                 nat_tuple.src.l3num = nf_ct_l3num(master);
2723                 nat_tuple.src.u3 = exp->saved_addr;
2724                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2725                 nat_tuple.src.u = exp->saved_proto;
2726
2727                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2728                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2729                         goto nla_put_failure;
2730                 nla_nest_end(skb, nest_parms);
2731         }
2732 #endif
2733         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2734             nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2735             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2736             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2737                 goto nla_put_failure;
2738         help = nfct_help(master);
2739         if (help) {
2740                 struct nf_conntrack_helper *helper;
2741
2742                 helper = rcu_dereference(help->helper);
2743                 if (helper &&
2744                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2745                         goto nla_put_failure;
2746         }
2747         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2748         if (expfn != NULL &&
2749             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2750                 goto nla_put_failure;
2751
2752         return 0;
2753
2754 nla_put_failure:
2755         return -1;
2756 }
2757
2758 static int
2759 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2760                         int event, const struct nf_conntrack_expect *exp)
2761 {
2762         struct nlmsghdr *nlh;
2763         unsigned int flags = portid ? NLM_F_MULTI : 0;
2764
2765         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2766         nlh = nfnl_msg_put(skb, portid, seq, event, flags,
2767                            exp->tuple.src.l3num, NFNETLINK_V0, 0);
2768         if (!nlh)
2769                 goto nlmsg_failure;
2770
2771         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2772                 goto nla_put_failure;
2773
2774         nlmsg_end(skb, nlh);
2775         return skb->len;
2776
2777 nlmsg_failure:
2778 nla_put_failure:
2779         nlmsg_cancel(skb, nlh);
2780         return -1;
2781 }
2782
2783 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2784 static int
2785 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2786 {
2787         struct nf_conntrack_expect *exp = item->exp;
2788         struct net *net = nf_ct_exp_net(exp);
2789         struct nlmsghdr *nlh;
2790         struct sk_buff *skb;
2791         unsigned int type, group;
2792         int flags = 0;
2793
2794         if (events & (1 << IPEXP_DESTROY)) {
2795                 type = IPCTNL_MSG_EXP_DELETE;
2796                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2797         } else if (events & (1 << IPEXP_NEW)) {
2798                 type = IPCTNL_MSG_EXP_NEW;
2799                 flags = NLM_F_CREATE|NLM_F_EXCL;
2800                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2801         } else
2802                 return 0;
2803
2804         if (!item->report && !nfnetlink_has_listeners(net, group))
2805                 return 0;
2806
2807         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2808         if (skb == NULL)
2809                 goto errout;
2810
2811         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2812         nlh = nfnl_msg_put(skb, item->portid, 0, type, flags,
2813                            exp->tuple.src.l3num, NFNETLINK_V0, 0);
2814         if (!nlh)
2815                 goto nlmsg_failure;
2816
2817         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2818                 goto nla_put_failure;
2819
2820         nlmsg_end(skb, nlh);
2821         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2822         return 0;
2823
2824 nla_put_failure:
2825         nlmsg_cancel(skb, nlh);
2826 nlmsg_failure:
2827         kfree_skb(skb);
2828 errout:
2829         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2830         return 0;
2831 }
2832 #endif
2833 static int ctnetlink_exp_done(struct netlink_callback *cb)
2834 {
2835         if (cb->args[1])
2836                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2837         return 0;
2838 }
2839
2840 static int
2841 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2842 {
2843         struct net *net = sock_net(skb->sk);
2844         struct nf_conntrack_expect *exp, *last;
2845         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2846         u_int8_t l3proto = nfmsg->nfgen_family;
2847
2848         rcu_read_lock();
2849         last = (struct nf_conntrack_expect *)cb->args[1];
2850         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2851 restart:
2852                 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2853                                          hnode) {
2854                         if (l3proto && exp->tuple.src.l3num != l3proto)
2855                                 continue;
2856
2857                         if (!net_eq(nf_ct_net(exp->master), net))
2858                                 continue;
2859
2860                         if (cb->args[1]) {
2861                                 if (exp != last)
2862                                         continue;
2863                                 cb->args[1] = 0;
2864                         }
2865                         if (ctnetlink_exp_fill_info(skb,
2866                                                     NETLINK_CB(cb->skb).portid,
2867                                                     cb->nlh->nlmsg_seq,
2868                                                     IPCTNL_MSG_EXP_NEW,
2869                                                     exp) < 0) {
2870                                 if (!refcount_inc_not_zero(&exp->use))
2871                                         continue;
2872                                 cb->args[1] = (unsigned long)exp;
2873                                 goto out;
2874                         }
2875                 }
2876                 if (cb->args[1]) {
2877                         cb->args[1] = 0;
2878                         goto restart;
2879                 }
2880         }
2881 out:
2882         rcu_read_unlock();
2883         if (last)
2884                 nf_ct_expect_put(last);
2885
2886         return skb->len;
2887 }
2888
2889 static int
2890 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2891 {
2892         struct nf_conntrack_expect *exp, *last;
2893         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2894         struct nf_conn *ct = cb->data;
2895         struct nf_conn_help *help = nfct_help(ct);
2896         u_int8_t l3proto = nfmsg->nfgen_family;
2897
2898         if (cb->args[0])
2899                 return 0;
2900
2901         rcu_read_lock();
2902         last = (struct nf_conntrack_expect *)cb->args[1];
2903 restart:
2904         hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2905                 if (l3proto && exp->tuple.src.l3num != l3proto)
2906                         continue;
2907                 if (cb->args[1]) {
2908                         if (exp != last)
2909                                 continue;
2910                         cb->args[1] = 0;
2911                 }
2912                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2913                                             cb->nlh->nlmsg_seq,
2914                                             IPCTNL_MSG_EXP_NEW,
2915                                             exp) < 0) {
2916                         if (!refcount_inc_not_zero(&exp->use))
2917                                 continue;
2918                         cb->args[1] = (unsigned long)exp;
2919                         goto out;
2920                 }
2921         }
2922         if (cb->args[1]) {
2923                 cb->args[1] = 0;
2924                 goto restart;
2925         }
2926         cb->args[0] = 1;
2927 out:
2928         rcu_read_unlock();
2929         if (last)
2930                 nf_ct_expect_put(last);
2931
2932         return skb->len;
2933 }
2934
2935 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
2936                                  struct sk_buff *skb,
2937                                  const struct nlmsghdr *nlh,
2938                                  const struct nlattr * const cda[],
2939                                  struct netlink_ext_ack *extack)
2940 {
2941         int err;
2942         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2943         u_int8_t u3 = nfmsg->nfgen_family;
2944         struct nf_conntrack_tuple tuple;
2945         struct nf_conntrack_tuple_hash *h;
2946         struct nf_conn *ct;
2947         struct nf_conntrack_zone zone;
2948         struct netlink_dump_control c = {
2949                 .dump = ctnetlink_exp_ct_dump_table,
2950                 .done = ctnetlink_exp_done,
2951         };
2952
2953         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
2954                                     u3, NULL);
2955         if (err < 0)
2956                 return err;
2957
2958         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2959         if (err < 0)
2960                 return err;
2961
2962         h = nf_conntrack_find_get(net, &zone, &tuple);
2963         if (!h)
2964                 return -ENOENT;
2965
2966         ct = nf_ct_tuplehash_to_ctrack(h);
2967         /* No expectation linked to this connection tracking. */
2968         if (!nfct_help(ct)) {
2969                 nf_ct_put(ct);
2970                 return 0;
2971         }
2972
2973         c.data = ct;
2974
2975         err = netlink_dump_start(ctnl, skb, nlh, &c);
2976         nf_ct_put(ct);
2977
2978         return err;
2979 }
2980
2981 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
2982                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
2983                                 const struct nlattr * const cda[],
2984                                 struct netlink_ext_ack *extack)
2985 {
2986         struct nf_conntrack_tuple tuple;
2987         struct nf_conntrack_expect *exp;
2988         struct sk_buff *skb2;
2989         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2990         u_int8_t u3 = nfmsg->nfgen_family;
2991         struct nf_conntrack_zone zone;
2992         int err;
2993
2994         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2995                 if (cda[CTA_EXPECT_MASTER])
2996                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
2997                                                      extack);
2998                 else {
2999                         struct netlink_dump_control c = {
3000                                 .dump = ctnetlink_exp_dump_table,
3001                                 .done = ctnetlink_exp_done,
3002                         };
3003                         return netlink_dump_start(ctnl, skb, nlh, &c);
3004                 }
3005         }
3006
3007         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3008         if (err < 0)
3009                 return err;
3010
3011         if (cda[CTA_EXPECT_TUPLE])
3012                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3013                                             u3, NULL);
3014         else if (cda[CTA_EXPECT_MASTER])
3015                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3016                                             u3, NULL);
3017         else
3018                 return -EINVAL;
3019
3020         if (err < 0)
3021                 return err;
3022
3023         exp = nf_ct_expect_find_get(net, &zone, &tuple);
3024         if (!exp)
3025                 return -ENOENT;
3026
3027         if (cda[CTA_EXPECT_ID]) {
3028                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3029
3030                 if (id != nf_expect_get_id(exp)) {
3031                         nf_ct_expect_put(exp);
3032                         return -ENOENT;
3033                 }
3034         }
3035
3036         err = -ENOMEM;
3037         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3038         if (skb2 == NULL) {
3039                 nf_ct_expect_put(exp);
3040                 goto out;
3041         }
3042
3043         rcu_read_lock();
3044         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3045                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3046         rcu_read_unlock();
3047         nf_ct_expect_put(exp);
3048         if (err <= 0)
3049                 goto free;
3050
3051         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3052         if (err < 0)
3053                 goto out;
3054
3055         return 0;
3056
3057 free:
3058         kfree_skb(skb2);
3059 out:
3060         /* this avoids a loop in nfnetlink. */
3061         return err == -EAGAIN ? -ENOBUFS : err;
3062 }
3063
3064 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3065 {
3066         const struct nf_conn_help *m_help;
3067         const char *name = data;
3068
3069         m_help = nfct_help(exp->master);
3070
3071         return strcmp(m_help->helper->name, name) == 0;
3072 }
3073
3074 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3075 {
3076         return true;
3077 }
3078
3079 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3080                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3081                                 const struct nlattr * const cda[],
3082                                 struct netlink_ext_ack *extack)
3083 {
3084         struct nf_conntrack_expect *exp;
3085         struct nf_conntrack_tuple tuple;
3086         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3087         u_int8_t u3 = nfmsg->nfgen_family;
3088         struct nf_conntrack_zone zone;
3089         int err;
3090
3091         if (cda[CTA_EXPECT_TUPLE]) {
3092                 /* delete a single expect by tuple */
3093                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3094                 if (err < 0)
3095                         return err;
3096
3097                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3098                                             u3, NULL);
3099                 if (err < 0)
3100                         return err;
3101
3102                 /* bump usage count to 2 */
3103                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3104                 if (!exp)
3105                         return -ENOENT;
3106
3107                 if (cda[CTA_EXPECT_ID]) {
3108                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3109                         if (ntohl(id) != (u32)(unsigned long)exp) {
3110                                 nf_ct_expect_put(exp);
3111                                 return -ENOENT;
3112                         }
3113                 }
3114
3115                 /* after list removal, usage count == 1 */
3116                 spin_lock_bh(&nf_conntrack_expect_lock);
3117                 if (del_timer(&exp->timeout)) {
3118                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3119                                                    nlmsg_report(nlh));
3120                         nf_ct_expect_put(exp);
3121                 }
3122                 spin_unlock_bh(&nf_conntrack_expect_lock);
3123                 /* have to put what we 'get' above.
3124                  * after this line usage count == 0 */
3125                 nf_ct_expect_put(exp);
3126         } else if (cda[CTA_EXPECT_HELP_NAME]) {
3127                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3128
3129                 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3130                                          NETLINK_CB(skb).portid,
3131                                          nlmsg_report(nlh));
3132         } else {
3133                 /* This basically means we have to flush everything*/
3134                 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3135                                          NETLINK_CB(skb).portid,
3136                                          nlmsg_report(nlh));
3137         }
3138
3139         return 0;
3140 }
3141 static int
3142 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3143                         const struct nlattr * const cda[])
3144 {
3145         if (cda[CTA_EXPECT_TIMEOUT]) {
3146                 if (!del_timer(&x->timeout))
3147                         return -ETIME;
3148
3149                 x->timeout.expires = jiffies +
3150                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3151                 add_timer(&x->timeout);
3152         }
3153         return 0;
3154 }
3155
3156 #if IS_ENABLED(CONFIG_NF_NAT)
3157 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3158         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
3159         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
3160 };
3161 #endif
3162
3163 static int
3164 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3165                            struct nf_conntrack_expect *exp,
3166                            u_int8_t u3)
3167 {
3168 #ifdef CONFIG_NF_NAT_NEEDED
3169         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3170         struct nf_conntrack_tuple nat_tuple = {};
3171         int err;
3172
3173         err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr,
3174                                exp_nat_nla_policy, NULL);
3175         if (err < 0)
3176                 return err;
3177
3178         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3179                 return -EINVAL;
3180
3181         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3182                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3183                                     u3, NULL);
3184         if (err < 0)
3185                 return err;
3186
3187         exp->saved_addr = nat_tuple.src.u3;
3188         exp->saved_proto = nat_tuple.src.u;
3189         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3190
3191         return 0;
3192 #else
3193         return -EOPNOTSUPP;
3194 #endif
3195 }
3196
3197 static struct nf_conntrack_expect *
3198 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3199                        struct nf_conntrack_helper *helper,
3200                        struct nf_conntrack_tuple *tuple,
3201                        struct nf_conntrack_tuple *mask)
3202 {
3203         u_int32_t class = 0;
3204         struct nf_conntrack_expect *exp;
3205         struct nf_conn_help *help;
3206         int err;
3207
3208         help = nfct_help(ct);
3209         if (!help)
3210                 return ERR_PTR(-EOPNOTSUPP);
3211
3212         if (cda[CTA_EXPECT_CLASS] && helper) {
3213                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3214                 if (class > helper->expect_class_max)
3215                         return ERR_PTR(-EINVAL);
3216         }
3217         exp = nf_ct_expect_alloc(ct);
3218         if (!exp)
3219                 return ERR_PTR(-ENOMEM);
3220
3221         if (cda[CTA_EXPECT_FLAGS]) {
3222                 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3223                 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3224         } else {
3225                 exp->flags = 0;
3226         }
3227         if (cda[CTA_EXPECT_FN]) {
3228                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3229                 struct nf_ct_helper_expectfn *expfn;
3230
3231                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3232                 if (expfn == NULL) {
3233                         err = -EINVAL;
3234                         goto err_out;
3235                 }
3236                 exp->expectfn = expfn->expectfn;
3237         } else
3238                 exp->expectfn = NULL;
3239
3240         exp->class = class;
3241         exp->master = ct;
3242         exp->helper = helper;
3243         exp->tuple = *tuple;
3244         exp->mask.src.u3 = mask->src.u3;
3245         exp->mask.src.u.all = mask->src.u.all;
3246
3247         if (cda[CTA_EXPECT_NAT]) {
3248                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3249                                                  exp, nf_ct_l3num(ct));
3250                 if (err < 0)
3251                         goto err_out;
3252         }
3253         return exp;
3254 err_out:
3255         nf_ct_expect_put(exp);
3256         return ERR_PTR(err);
3257 }
3258
3259 static int
3260 ctnetlink_create_expect(struct net *net,
3261                         const struct nf_conntrack_zone *zone,
3262                         const struct nlattr * const cda[],
3263                         u_int8_t u3, u32 portid, int report)
3264 {
3265         struct nf_conntrack_tuple tuple, mask, master_tuple;
3266         struct nf_conntrack_tuple_hash *h = NULL;
3267         struct nf_conntrack_helper *helper = NULL;
3268         struct nf_conntrack_expect *exp;
3269         struct nf_conn *ct;
3270         int err;
3271
3272         /* caller guarantees that those three CTA_EXPECT_* exist */
3273         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3274                                     u3, NULL);
3275         if (err < 0)
3276                 return err;
3277         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3278                                     u3, NULL);
3279         if (err < 0)
3280                 return err;
3281         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3282                                     u3, NULL);
3283         if (err < 0)
3284                 return err;
3285
3286         /* Look for master conntrack of this expectation */
3287         h = nf_conntrack_find_get(net, zone, &master_tuple);
3288         if (!h)
3289                 return -ENOENT;
3290         ct = nf_ct_tuplehash_to_ctrack(h);
3291
3292         rcu_read_lock();
3293         if (cda[CTA_EXPECT_HELP_NAME]) {
3294                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3295
3296                 helper = __nf_conntrack_helper_find(helpname, u3,
3297                                                     nf_ct_protonum(ct));
3298                 if (helper == NULL) {
3299                         rcu_read_unlock();
3300 #ifdef CONFIG_MODULES
3301                         if (request_module("nfct-helper-%s", helpname) < 0) {
3302                                 err = -EOPNOTSUPP;
3303                                 goto err_ct;
3304                         }
3305                         rcu_read_lock();
3306                         helper = __nf_conntrack_helper_find(helpname, u3,
3307                                                             nf_ct_protonum(ct));
3308                         if (helper) {
3309                                 err = -EAGAIN;
3310                                 goto err_rcu;
3311                         }
3312                         rcu_read_unlock();
3313 #endif
3314                         err = -EOPNOTSUPP;
3315                         goto err_ct;
3316                 }
3317         }
3318
3319         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3320         if (IS_ERR(exp)) {
3321                 err = PTR_ERR(exp);
3322                 goto err_rcu;
3323         }
3324
3325         err = nf_ct_expect_related_report(exp, portid, report);
3326         nf_ct_expect_put(exp);
3327 err_rcu:
3328         rcu_read_unlock();
3329 err_ct:
3330         nf_ct_put(ct);
3331         return err;
3332 }
3333
3334 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3335                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3336                                 const struct nlattr * const cda[],
3337                                 struct netlink_ext_ack *extack)
3338 {
3339         struct nf_conntrack_tuple tuple;
3340         struct nf_conntrack_expect *exp;
3341         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3342         u_int8_t u3 = nfmsg->nfgen_family;
3343         struct nf_conntrack_zone zone;
3344         int err;
3345
3346         if (!cda[CTA_EXPECT_TUPLE]
3347             || !cda[CTA_EXPECT_MASK]
3348             || !cda[CTA_EXPECT_MASTER])
3349                 return -EINVAL;
3350
3351         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3352         if (err < 0)
3353                 return err;
3354
3355         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3356                                     u3, NULL);
3357         if (err < 0)
3358                 return err;
3359
3360         spin_lock_bh(&nf_conntrack_expect_lock);
3361         exp = __nf_ct_expect_find(net, &zone, &tuple);
3362         if (!exp) {
3363                 spin_unlock_bh(&nf_conntrack_expect_lock);
3364                 err = -ENOENT;
3365                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3366                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3367                                                       NETLINK_CB(skb).portid,
3368                                                       nlmsg_report(nlh));
3369                 }
3370                 return err;
3371         }
3372
3373         err = -EEXIST;
3374         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3375                 err = ctnetlink_change_expect(exp, cda);
3376         spin_unlock_bh(&nf_conntrack_expect_lock);
3377
3378         return err;
3379 }
3380
3381 static int
3382 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3383                              const struct ip_conntrack_stat *st)
3384 {
3385         struct nlmsghdr *nlh;
3386         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3387
3388         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3389                               IPCTNL_MSG_EXP_GET_STATS_CPU);
3390         nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
3391                            NFNETLINK_V0, htons(cpu));
3392         if (!nlh)
3393                 goto nlmsg_failure;
3394
3395         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3396             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3397             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3398                 goto nla_put_failure;
3399
3400         nlmsg_end(skb, nlh);
3401         return skb->len;
3402
3403 nla_put_failure:
3404 nlmsg_failure:
3405         nlmsg_cancel(skb, nlh);
3406         return -1;
3407 }
3408
3409 static int
3410 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3411 {
3412         int cpu;
3413         struct net *net = sock_net(skb->sk);
3414
3415         if (cb->args[0] == nr_cpu_ids)
3416                 return 0;
3417
3418         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3419                 const struct ip_conntrack_stat *st;
3420
3421                 if (!cpu_possible(cpu))
3422                         continue;
3423
3424                 st = per_cpu_ptr(net->ct.stat, cpu);
3425                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3426                                                  cb->nlh->nlmsg_seq,
3427                                                  cpu, st) < 0)
3428                         break;
3429         }
3430         cb->args[0] = cpu;
3431
3432         return skb->len;
3433 }
3434
3435 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3436                                   struct sk_buff *skb,
3437                                   const struct nlmsghdr *nlh,
3438                                   const struct nlattr * const cda[],
3439                                   struct netlink_ext_ack *extack)
3440 {
3441         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3442                 struct netlink_dump_control c = {
3443                         .dump = ctnetlink_exp_stat_cpu_dump,
3444                 };
3445                 return netlink_dump_start(ctnl, skb, nlh, &c);
3446         }
3447
3448         return 0;
3449 }
3450
3451 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3452 static struct nf_ct_event_notifier ctnl_notifier = {
3453         .fcn = ctnetlink_conntrack_event,
3454 };
3455
3456 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3457         .fcn = ctnetlink_expect_event,
3458 };
3459 #endif
3460
3461 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3462         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3463                                             .attr_count = CTA_MAX,
3464                                             .policy = ct_nla_policy },
3465         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3466                                             .attr_count = CTA_MAX,
3467                                             .policy = ct_nla_policy },
3468         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3469                                             .attr_count = CTA_MAX,
3470                                             .policy = ct_nla_policy },
3471         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3472                                             .attr_count = CTA_MAX,
3473                                             .policy = ct_nla_policy },
3474         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3475         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3476         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3477         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3478 };
3479
3480 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3481         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3482                                             .attr_count = CTA_EXPECT_MAX,
3483                                             .policy = exp_nla_policy },
3484         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3485                                             .attr_count = CTA_EXPECT_MAX,
3486                                             .policy = exp_nla_policy },
3487         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3488                                             .attr_count = CTA_EXPECT_MAX,
3489                                             .policy = exp_nla_policy },
3490         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3491 };
3492
3493 static const struct nfnetlink_subsystem ctnl_subsys = {
3494         .name                           = "conntrack",
3495         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3496         .cb_count                       = IPCTNL_MSG_MAX,
3497         .cb                             = ctnl_cb,
3498 };
3499
3500 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3501         .name                           = "conntrack_expect",
3502         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3503         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3504         .cb                             = ctnl_exp_cb,
3505 };
3506
3507 MODULE_ALIAS("ip_conntrack_netlink");
3508 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3509 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3510
3511 static int __net_init ctnetlink_net_init(struct net *net)
3512 {
3513 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3514         int ret;
3515
3516         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3517         if (ret < 0) {
3518                 pr_err("ctnetlink_init: cannot register notifier.\n");
3519                 goto err_out;
3520         }
3521
3522         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3523         if (ret < 0) {
3524                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3525                 goto err_unreg_notifier;
3526         }
3527 #endif
3528         return 0;
3529
3530 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3531 err_unreg_notifier:
3532         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3533 err_out:
3534         return ret;
3535 #endif
3536 }
3537
3538 static void ctnetlink_net_exit(struct net *net)
3539 {
3540 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3541         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3542         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3543 #endif
3544 }
3545
3546 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3547 {
3548         struct net *net;
3549
3550         list_for_each_entry(net, net_exit_list, exit_list)
3551                 ctnetlink_net_exit(net);
3552
3553         /* wait for other cpus until they are done with ctnl_notifiers */
3554         synchronize_rcu();
3555 }
3556
3557 static struct pernet_operations ctnetlink_net_ops = {
3558         .init           = ctnetlink_net_init,
3559         .exit_batch     = ctnetlink_net_exit_batch,
3560 };
3561
3562 static int __init ctnetlink_init(void)
3563 {
3564         int ret;
3565
3566         ret = nfnetlink_subsys_register(&ctnl_subsys);
3567         if (ret < 0) {
3568                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3569                 goto err_out;
3570         }
3571
3572         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3573         if (ret < 0) {
3574                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3575                 goto err_unreg_subsys;
3576         }
3577
3578         ret = register_pernet_subsys(&ctnetlink_net_ops);
3579         if (ret < 0) {
3580                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3581                 goto err_unreg_exp_subsys;
3582         }
3583 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3584         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3585         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3586 #endif
3587         return 0;
3588
3589 err_unreg_exp_subsys:
3590         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3591 err_unreg_subsys:
3592         nfnetlink_subsys_unregister(&ctnl_subsys);
3593 err_out:
3594         return ret;
3595 }
3596
3597 static void __exit ctnetlink_exit(void)
3598 {
3599         unregister_pernet_subsys(&ctnetlink_net_ops);
3600         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3601         nfnetlink_subsys_unregister(&ctnl_subsys);
3602 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3603         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3604 #endif
3605         synchronize_rcu();
3606 }
3607
3608 module_init(ctnetlink_init);
3609 module_exit(ctnetlink_exit);