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 #if IS_ENABLED(CONFIG_NF_NAT)
  50 #include <net/netfilter/nf_nat.h>
  51 #include <net/netfilter/nf_nat_helper.h>
  52 #endif
  53
  54 #include <linux/netfilter/nfnetlink.h>
  55 #include <linux/netfilter/nfnetlink_conntrack.h>
  56
  57 MODULE_LICENSE("GPL");
  58
  59 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  60                                 const struct nf_conntrack_tuple *tuple,
  61                                 const struct nf_conntrack_l4proto *l4proto)
  62 {
  63         int ret = 0;
  64         struct nlattr *nest_parms;
  65
  66         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
  67         if (!nest_parms)
  68                 goto nla_put_failure;
  69         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  70                 goto nla_put_failure;
  71
  72         if (likely(l4proto->tuple_to_nlattr))
  73                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  74
  75         nla_nest_end(skb, nest_parms);
  76
  77         return ret;
  78
  79 nla_put_failure:
  80         return -1;
  81 }
  82
  83 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
  84                                 const struct nf_conntrack_tuple *tuple)
  85 {
  86         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
  87             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
  88                 return -EMSGSIZE;
  89         return 0;
  90 }
  91
  92 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
  93                                 const struct nf_conntrack_tuple *tuple)
  94 {
  95         if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
  96             nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
  97                 return -EMSGSIZE;
  98         return 0;
  99 }
 100
 101 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 102                                     const struct nf_conntrack_tuple *tuple)
 103 {
 104         int ret = 0;
 105         struct nlattr *nest_parms;
 106
 107         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
 108         if (!nest_parms)
 109                 goto nla_put_failure;
 110
 111         switch (tuple->src.l3num) {
 112         case NFPROTO_IPV4:
 113                 ret = ipv4_tuple_to_nlattr(skb, tuple);
 114                 break;
 115         case NFPROTO_IPV6:
 116                 ret = ipv6_tuple_to_nlattr(skb, tuple);
 117                 break;
 118         }
 119
 120         nla_nest_end(skb, nest_parms);
 121
 122         return ret;
 123
 124 nla_put_failure:
 125         return -1;
 126 }
 127
 128 static int ctnetlink_dump_tuples(struct sk_buff *skb,
 129                                  const struct nf_conntrack_tuple *tuple)
 130 {
 131         const struct nf_conntrack_l4proto *l4proto;
 132         int ret;
 133
 134         rcu_read_lock();
 135         ret = ctnetlink_dump_tuples_ip(skb, tuple);
 136
 137         if (ret >= 0) {
 138                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
 139                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 140         }
 141         rcu_read_unlock();
 142         return ret;
 143 }
 144
 145 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
 146                                   const struct nf_conntrack_zone *zone, int dir)
 147 {
 148         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
 149                 return 0;
 150         if (nla_put_be16(skb, attrtype, htons(zone->id)))
 151                 goto nla_put_failure;
 152         return 0;
 153
 154 nla_put_failure:
 155         return -1;
 156 }
 157
 158 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 159 {
 160         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 161                 goto nla_put_failure;
 162         return 0;
 163
 164 nla_put_failure:
 165         return -1;
 166 }
 167
 168 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 169 {
 170         long timeout = nf_ct_expires(ct) / HZ;
 171
 172         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 173                 goto nla_put_failure;
 174         return 0;
 175
 176 nla_put_failure:
 177         return -1;
 178 }
 179
 180 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 181 {
 182         const struct nf_conntrack_l4proto *l4proto;
 183         struct nlattr *nest_proto;
 184         int ret;
 185
 186         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
 187         if (!l4proto->to_nlattr)
 188                 return 0;
 189
 190         nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
 191         if (!nest_proto)
 192                 goto nla_put_failure;
 193
 194         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 195
 196         nla_nest_end(skb, nest_proto);
 197
 198         return ret;
 199
 200 nla_put_failure:
 201         return -1;
 202 }
 203
 204 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
 205                                    const struct nf_conn *ct)
 206 {
 207         struct nlattr *nest_helper;
 208         const struct nf_conn_help *help = nfct_help(ct);
 209         struct nf_conntrack_helper *helper;
 210
 211         if (!help)
 212                 return 0;
 213
 214         helper = rcu_dereference(help->helper);
 215         if (!helper)
 216                 goto out;
 217
 218         nest_helper = nla_nest_start(skb, CTA_HELP);
 219         if (!nest_helper)
 220                 goto nla_put_failure;
 221         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 222                 goto nla_put_failure;
 223
 224         if (helper->to_nlattr)
 225                 helper->to_nlattr(skb, ct);
 226
 227         nla_nest_end(skb, nest_helper);
 228 out:
 229         return 0;
 230
 231 nla_put_failure:
 232         return -1;
 233 }
 234
 235 static int
 236 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
 237               enum ip_conntrack_dir dir, int type)
 238 {
 239         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 240         struct nf_conn_counter *counter = acct->counter;
 241         struct nlattr *nest_count;
 242         u64 pkts, bytes;
 243
 244         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 245                 pkts = atomic64_xchg(&counter[dir].packets, 0);
 246                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
 247         } else {
 248                 pkts = atomic64_read(&counter[dir].packets);
 249                 bytes = atomic64_read(&counter[dir].bytes);
 250         }
 251
 252         nest_count = nla_nest_start(skb, attr);
 253         if (!nest_count)
 254                 goto nla_put_failure;
 255
 256         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
 257                          CTA_COUNTERS_PAD) ||
 258             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
 259                          CTA_COUNTERS_PAD))
 260                 goto nla_put_failure;
 261
 262         nla_nest_end(skb, nest_count);
 263
 264         return 0;
 265
 266 nla_put_failure:
 267         return -1;
 268 }
 269
 270 static int
 271 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
 272 {
 273         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
 274
 275         if (!acct)
 276                 return 0;
 277
 278         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
 279                 return -1;
 280         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
 281                 return -1;
 282
 283         return 0;
 284 }
 285
 286 static int
 287 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 288 {
 289         struct nlattr *nest_count;
 290         const struct nf_conn_tstamp *tstamp;
 291
 292         tstamp = nf_conn_tstamp_find(ct);
 293         if (!tstamp)
 294                 return 0;
 295
 296         nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
 297         if (!nest_count)
 298                 goto nla_put_failure;
 299
 300         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
 301                          CTA_TIMESTAMP_PAD) ||
 302             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 303                                                cpu_to_be64(tstamp->stop),
 304                                                CTA_TIMESTAMP_PAD)))
 305                 goto nla_put_failure;
 306         nla_nest_end(skb, nest_count);
 307
 308         return 0;
 309
 310 nla_put_failure:
 311         return -1;
 312 }
 313
 314 #ifdef CONFIG_NF_CONNTRACK_MARK
 315 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 316 {
 317         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 318                 goto nla_put_failure;
 319         return 0;
 320
 321 nla_put_failure:
 322         return -1;
 323 }
 324 #else
 325 #define ctnetlink_dump_mark(a, b) (0)
 326 #endif
 327
 328 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 329 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 330 {
 331         struct nlattr *nest_secctx;
 332         int len, ret;
 333         char *secctx;
 334
 335         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 336         if (ret)
 337                 return 0;
 338
 339         ret = -1;
 340         nest_secctx = nla_nest_start(skb, CTA_SECCTX);
 341         if (!nest_secctx)
 342                 goto nla_put_failure;
 343
 344         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 345                 goto nla_put_failure;
 346         nla_nest_end(skb, nest_secctx);
 347
 348         ret = 0;
 349 nla_put_failure:
 350         security_release_secctx(secctx, len);
 351         return ret;
 352 }
 353 #else
 354 #define ctnetlink_dump_secctx(a, b) (0)
 355 #endif
 356
 357 #ifdef CONFIG_NF_CONNTRACK_LABELS
 358 static inline int ctnetlink_label_size(const struct nf_conn *ct)
 359 {
 360         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 361
 362         if (!labels)
 363                 return 0;
 364         return nla_total_size(sizeof(labels->bits));
 365 }
 366
 367 static int
 368 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 369 {
 370         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 371         unsigned int i;
 372
 373         if (!labels)
 374                 return 0;
 375
 376         i = 0;
 377         do {
 378                 if (labels->bits[i] != 0)
 379                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
 380                                        labels->bits);
 381                 i++;
 382         } while (i < ARRAY_SIZE(labels->bits));
 383
 384         return 0;
 385 }
 386 #else
 387 #define ctnetlink_dump_labels(a, b) (0)
 388 #define ctnetlink_label_size(a) (0)
 389 #endif
 390
 391 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 392
 393 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 394 {
 395         struct nlattr *nest_parms;
 396
 397         if (!(ct->status & IPS_EXPECTED))
 398                 return 0;
 399
 400         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
 401         if (!nest_parms)
 402                 goto nla_put_failure;
 403         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 404                 goto nla_put_failure;
 405         nla_nest_end(skb, nest_parms);
 406
 407         return 0;
 408
 409 nla_put_failure:
 410         return -1;
 411 }
 412
 413 static int
 414 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
 415 {
 416         struct nlattr *nest_parms;
 417
 418         nest_parms = nla_nest_start(skb, type);
 419         if (!nest_parms)
 420                 goto nla_put_failure;
 421
 422         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
 423                          htonl(seq->correction_pos)) ||
 424             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
 425                          htonl(seq->offset_before)) ||
 426             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
 427                          htonl(seq->offset_after)))
 428                 goto nla_put_failure;
 429
 430         nla_nest_end(skb, nest_parms);
 431
 432         return 0;
 433
 434 nla_put_failure:
 435         return -1;
 436 }
 437
 438 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
 439 {
 440         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
 441         struct nf_ct_seqadj *seq;
 442
 443         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
 444                 return 0;
 445
 446         spin_lock_bh(&ct->lock);
 447         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
 448         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
 449                 goto err;
 450
 451         seq = &seqadj->seq[IP_CT_DIR_REPLY];
 452         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
 453                 goto err;
 454
 455         spin_unlock_bh(&ct->lock);
 456         return 0;
 457 err:
 458         spin_unlock_bh(&ct->lock);
 459         return -1;
 460 }
 461
 462 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
 463 {
 464         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
 465         struct nlattr *nest_parms;
 466
 467         if (!synproxy)
 468                 return 0;
 469
 470         nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
 471         if (!nest_parms)
 472                 goto nla_put_failure;
 473
 474         if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
 475             nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
 476             nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
 477                 goto nla_put_failure;
 478
 479         nla_nest_end(skb, nest_parms);
 480
 481         return 0;
 482
 483 nla_put_failure:
 484         return -1;
 485 }
 486
 487 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 488 {
 489         __be32 id = (__force __be32)nf_ct_get_id(ct);
 490
 491         if (nla_put_be32(skb, CTA_ID, id))
 492                 goto nla_put_failure;
 493         return 0;
 494
 495 nla_put_failure:
 496         return -1;
 497 }
 498
 499 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 500 {
 501         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 502                 goto nla_put_failure;
 503         return 0;
 504
 505 nla_put_failure:
 506         return -1;
 507 }
 508
 509 /* all these functions access ct->ext. Caller must either hold a reference
 510  * on ct or prevent its deletion by holding either the bucket spinlock or
 511  * pcpu dying list lock.
 512  */
 513 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
 514                                   struct nf_conn *ct, u32 type)
 515 {
 516         if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 517             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 518             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 519             ctnetlink_dump_labels(skb, ct) < 0 ||
 520             ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
 521             ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 522                 return -1;
 523
 524         return 0;
 525 }
 526
 527 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
 528 {
 529         if (ctnetlink_dump_status(skb, ct) < 0 ||
 530             ctnetlink_dump_mark(skb, ct) < 0 ||
 531             ctnetlink_dump_secctx(skb, ct) < 0 ||
 532             ctnetlink_dump_id(skb, ct) < 0 ||
 533             ctnetlink_dump_use(skb, ct) < 0 ||
 534             ctnetlink_dump_master(skb, ct) < 0)
 535                 return -1;
 536
 537         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
 538             (ctnetlink_dump_timeout(skb, ct) < 0 ||
 539              ctnetlink_dump_protoinfo(skb, ct) < 0))
 540                 return -1;
 541
 542         return 0;
 543 }
 544
 545 static int
 546 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 547                     struct nf_conn *ct, bool extinfo)
 548 {
 549         const struct nf_conntrack_zone *zone;
 550         struct nlmsghdr *nlh;
 551         struct nfgenmsg *nfmsg;
 552         struct nlattr *nest_parms;
 553         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
 554
 555         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
 556         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
 557         if (nlh == NULL)
 558                 goto nlmsg_failure;
 559
 560         nfmsg = nlmsg_data(nlh);
 561         nfmsg->nfgen_family = nf_ct_l3num(ct);
 562         nfmsg->version      = NFNETLINK_V0;
 563         nfmsg->res_id       = 0;
 564
 565         zone = nf_ct_zone(ct);
 566
 567         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
 568         if (!nest_parms)
 569                 goto nla_put_failure;
 570         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 571                 goto nla_put_failure;
 572         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 573                                    NF_CT_ZONE_DIR_ORIG) < 0)
 574                 goto nla_put_failure;
 575         nla_nest_end(skb, nest_parms);
 576
 577         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
 578         if (!nest_parms)
 579                 goto nla_put_failure;
 580         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 581                 goto nla_put_failure;
 582         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 583                                    NF_CT_ZONE_DIR_REPL) < 0)
 584                 goto nla_put_failure;
 585         nla_nest_end(skb, nest_parms);
 586
 587         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 588                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 589                 goto nla_put_failure;
 590
 591         if (ctnetlink_dump_info(skb, ct) < 0)
 592                 goto nla_put_failure;
 593         if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
 594                 goto nla_put_failure;
 595
 596         nlmsg_end(skb, nlh);
 597         return skb->len;
 598
 599 nlmsg_failure:
 600 nla_put_failure:
 601         nlmsg_cancel(skb, nlh);
 602         return -1;
 603 }
 604
 605 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
 606         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
 607         [CTA_IP_V4_DST] = { .type = NLA_U32 },
 608         [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
 609         [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
 610 };
 611
 612 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
 613 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
 614 {
 615         const struct nf_conntrack_l4proto *l4proto;
 616         size_t len, len4 = 0;
 617
 618         len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
 619         len *= 3u; /* ORIG, REPLY, MASTER */
 620
 621         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
 622         len += l4proto->nlattr_size;
 623         if (l4proto->nlattr_tuple_size) {
 624                 len4 = l4proto->nlattr_tuple_size();
 625                 len4 *= 3u; /* ORIG, REPLY, MASTER */
 626         }
 627
 628         return len + len4;
 629 }
 630 #endif
 631
 632 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
 633 {
 634         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 635                 return 0;
 636         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 637                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 638                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 639                ;
 640 }
 641
 642 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
 643 {
 644 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 645         int len, ret;
 646
 647         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 648         if (ret)
 649                 return 0;
 650
 651         return nla_total_size(0) /* CTA_SECCTX */
 652                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 653 #else
 654         return 0;
 655 #endif
 656 }
 657
 658 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
 659 {
 660 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 661         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 662                 return 0;
 663         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
 664 #else
 665         return 0;
 666 #endif
 667 }
 668
 669 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 670 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
 671 {
 672         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 673                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 674                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 675                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 676                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 677                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 678                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 679                + ctnetlink_acct_size(ct)
 680                + ctnetlink_timestamp_size(ct)
 681                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 682                + nla_total_size(0) /* CTA_PROTOINFO */
 683                + nla_total_size(0) /* CTA_HELP */
 684                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 685                + ctnetlink_secctx_size(ct)
 686 #if IS_ENABLED(CONFIG_NF_NAT)
 687                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 688                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 689 #endif
 690 #ifdef CONFIG_NF_CONNTRACK_MARK
 691                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 692 #endif
 693 #ifdef CONFIG_NF_CONNTRACK_ZONES
 694                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
 695 #endif
 696                + ctnetlink_proto_size(ct)
 697                + ctnetlink_label_size(ct)
 698                ;
 699 }
 700
 701 static int
 702 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 703 {
 704         const struct nf_conntrack_zone *zone;
 705         struct net *net;
 706         struct nlmsghdr *nlh;
 707         struct nfgenmsg *nfmsg;
 708         struct nlattr *nest_parms;
 709         struct nf_conn *ct = item->ct;
 710         struct sk_buff *skb;
 711         unsigned int type;
 712         unsigned int flags = 0, group;
 713         int err;
 714
 715         if (events & (1 << IPCT_DESTROY)) {
 716                 type = IPCTNL_MSG_CT_DELETE;
 717                 group = NFNLGRP_CONNTRACK_DESTROY;
 718         } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 719                 type = IPCTNL_MSG_CT_NEW;
 720                 flags = NLM_F_CREATE|NLM_F_EXCL;
 721                 group = NFNLGRP_CONNTRACK_NEW;
 722         } else if (events) {
 723                 type = IPCTNL_MSG_CT_NEW;
 724                 group = NFNLGRP_CONNTRACK_UPDATE;
 725         } else
 726                 return 0;
 727
 728         net = nf_ct_net(ct);
 729         if (!item->report && !nfnetlink_has_listeners(net, group))
 730                 return 0;
 731
 732         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 733         if (skb == NULL)
 734                 goto errout;
 735
 736         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
 737         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
 738         if (nlh == NULL)
 739                 goto nlmsg_failure;
 740
 741         nfmsg = nlmsg_data(nlh);
 742         nfmsg->nfgen_family = nf_ct_l3num(ct);
 743         nfmsg->version  = NFNETLINK_V0;
 744         nfmsg->res_id   = 0;
 745
 746         zone = nf_ct_zone(ct);
 747
 748         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
 749         if (!nest_parms)
 750                 goto nla_put_failure;
 751         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 752                 goto nla_put_failure;
 753         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 754                                    NF_CT_ZONE_DIR_ORIG) < 0)
 755                 goto nla_put_failure;
 756         nla_nest_end(skb, nest_parms);
 757
 758         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
 759         if (!nest_parms)
 760                 goto nla_put_failure;
 761         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 762                 goto nla_put_failure;
 763         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 764                                    NF_CT_ZONE_DIR_REPL) < 0)
 765                 goto nla_put_failure;
 766         nla_nest_end(skb, nest_parms);
 767
 768         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 769                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 770                 goto nla_put_failure;
 771
 772         if (ctnetlink_dump_id(skb, ct) < 0)
 773                 goto nla_put_failure;
 774
 775         if (ctnetlink_dump_status(skb, ct) < 0)
 776                 goto nla_put_failure;
 777
 778         if (events & (1 << IPCT_DESTROY)) {
 779                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 780                     ctnetlink_dump_timestamp(skb, ct) < 0)
 781                         goto nla_put_failure;
 782         } else {
 783                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 784                         goto nla_put_failure;
 785
 786                 if (events & (1 << IPCT_PROTOINFO)
 787                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 788                         goto nla_put_failure;
 789
 790                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 791                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 792                         goto nla_put_failure;
 793
 794 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 795                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 796                     && ctnetlink_dump_secctx(skb, ct) < 0)
 797                         goto nla_put_failure;
 798 #endif
 799                 if (events & (1 << IPCT_LABEL) &&
 800                      ctnetlink_dump_labels(skb, ct) < 0)
 801                         goto nla_put_failure;
 802
 803                 if (events & (1 << IPCT_RELATED) &&
 804                     ctnetlink_dump_master(skb, ct) < 0)
 805                         goto nla_put_failure;
 806
 807                 if (events & (1 << IPCT_SEQADJ) &&
 808                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 809                         goto nla_put_failure;
 810
 811                 if (events & (1 << IPCT_SYNPROXY) &&
 812                     ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 813                         goto nla_put_failure;
 814         }
 815
 816 #ifdef CONFIG_NF_CONNTRACK_MARK
 817         if ((events & (1 << IPCT_MARK) || ct->mark)
 818             && ctnetlink_dump_mark(skb, ct) < 0)
 819                 goto nla_put_failure;
 820 #endif
 821         nlmsg_end(skb, nlh);
 822         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 823                              GFP_ATOMIC);
 824         if (err == -ENOBUFS || err == -EAGAIN)
 825                 return -ENOBUFS;
 826
 827         return 0;
 828
 829 nla_put_failure:
 830         nlmsg_cancel(skb, nlh);
 831 nlmsg_failure:
 832         kfree_skb(skb);
 833 errout:
 834         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 835                 return -ENOBUFS;
 836
 837         return 0;
 838 }
 839 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 840
 841 static int ctnetlink_done(struct netlink_callback *cb)
 842 {
 843         if (cb->args[1])
 844                 nf_ct_put((struct nf_conn *)cb->args[1]);
 845         kfree(cb->data);
 846         return 0;
 847 }
 848
 849 struct ctnetlink_filter {
 850         u8 family;
 851         struct {
 852                 u_int32_t val;
 853                 u_int32_t mask;
 854         } mark;
 855 };
 856
 857 static struct ctnetlink_filter *
 858 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
 859 {
 860         struct ctnetlink_filter *filter;
 861
 862 #ifndef CONFIG_NF_CONNTRACK_MARK
 863         if (cda[CTA_MARK] && cda[CTA_MARK_MASK])
 864                 return ERR_PTR(-EOPNOTSUPP);
 865 #endif
 866
 867         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
 868         if (filter == NULL)
 869                 return ERR_PTR(-ENOMEM);
 870
 871         filter->family = family;
 872
 873 #ifdef CONFIG_NF_CONNTRACK_MARK
 874         if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
 875                 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
 876                 filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
 877         }
 878 #endif
 879         return filter;
 880 }
 881
 882 static int ctnetlink_start(struct netlink_callback *cb)
 883 {
 884         const struct nlattr * const *cda = cb->data;
 885         struct ctnetlink_filter *filter = NULL;
 886         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 887         u8 family = nfmsg->nfgen_family;
 888
 889         if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
 890                 filter = ctnetlink_alloc_filter(cda, family);
 891                 if (IS_ERR(filter))
 892                         return PTR_ERR(filter);
 893         }
 894
 895         cb->data = filter;
 896         return 0;
 897 }
 898
 899 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
 900 {
 901         struct ctnetlink_filter *filter = data;
 902
 903         if (filter == NULL)
 904                 goto out;
 905
 906         /* Match entries of a given L3 protocol number.
 907          * If it is not specified, ie. l3proto == 0,
 908          * then match everything.
 909          */
 910         if (filter->family && nf_ct_l3num(ct) != filter->family)
 911                 goto ignore_entry;
 912
 913 #ifdef CONFIG_NF_CONNTRACK_MARK
 914         if ((ct->mark & filter->mark.mask) != filter->mark.val)
 915                 goto ignore_entry;
 916 #endif
 917
 918 out:
 919         return 1;
 920
 921 ignore_entry:
 922         return 0;
 923 }
 924
 925 static int
 926 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 927 {
 928         struct net *net = sock_net(skb->sk);
 929         struct nf_conn *ct, *last;
 930         struct nf_conntrack_tuple_hash *h;
 931         struct hlist_nulls_node *n;
 932         struct nf_conn *nf_ct_evict[8];
 933         int res, i;
 934         spinlock_t *lockp;
 935
 936         last = (struct nf_conn *)cb->args[1];
 937         i = 0;
 938
 939         local_bh_disable();
 940         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 941 restart:
 942                 while (i) {
 943                         i--;
 944                         if (nf_ct_should_gc(nf_ct_evict[i]))
 945                                 nf_ct_kill(nf_ct_evict[i]);
 946                         nf_ct_put(nf_ct_evict[i]);
 947                 }
 948
 949                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
 950                 nf_conntrack_lock(lockp);
 951                 if (cb->args[0] >= nf_conntrack_htable_size) {
 952                         spin_unlock(lockp);
 953                         goto out;
 954                 }
 955                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
 956                                            hnnode) {
 957                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 958                                 continue;
 959                         ct = nf_ct_tuplehash_to_ctrack(h);
 960                         if (nf_ct_is_expired(ct)) {
 961                                 if (i < ARRAY_SIZE(nf_ct_evict) &&
 962                                     atomic_inc_not_zero(&ct->ct_general.use))
 963                                         nf_ct_evict[i++] = ct;
 964                                 continue;
 965                         }
 966
 967                         if (!net_eq(net, nf_ct_net(ct)))
 968                                 continue;
 969
 970                         if (cb->args[1]) {
 971                                 if (ct != last)
 972                                         continue;
 973                                 cb->args[1] = 0;
 974                         }
 975                         if (!ctnetlink_filter_match(ct, cb->data))
 976                                 continue;
 977
 978                         res =
 979                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
 980                                             cb->nlh->nlmsg_seq,
 981                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 982                                             ct, true);
 983                         if (res < 0) {
 984                                 nf_conntrack_get(&ct->ct_general);
 985                                 cb->args[1] = (unsigned long)ct;
 986                                 spin_unlock(lockp);
 987                                 goto out;
 988                         }
 989                 }
 990                 spin_unlock(lockp);
 991                 if (cb->args[1]) {
 992                         cb->args[1] = 0;
 993                         goto restart;
 994                 }
 995         }
 996 out:
 997         local_bh_enable();
 998         if (last) {
 999                 /* nf ct hash resize happened, now clear the leftover. */
1000                 if ((struct nf_conn *)cb->args[1] == last)
1001                         cb->args[1] = 0;
1002
1003                 nf_ct_put(last);
1004         }
1005
1006         while (i) {
1007                 i--;
1008                 if (nf_ct_should_gc(nf_ct_evict[i]))
1009                         nf_ct_kill(nf_ct_evict[i]);
1010                 nf_ct_put(nf_ct_evict[i]);
1011         }
1012
1013         return skb->len;
1014 }
1015
1016 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1017                                 struct nf_conntrack_tuple *t)
1018 {
1019         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
1020                 return -EINVAL;
1021
1022         t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1023         t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1024
1025         return 0;
1026 }
1027
1028 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1029                                 struct nf_conntrack_tuple *t)
1030 {
1031         if (!tb[CTA_IP_V6_SRC] || !tb[CTA_IP_V6_DST])
1032                 return -EINVAL;
1033
1034         t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1035         t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1036
1037         return 0;
1038 }
1039
1040 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1041                                     struct nf_conntrack_tuple *tuple)
1042 {
1043         struct nlattr *tb[CTA_IP_MAX+1];
1044         int ret = 0;
1045
1046         ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1047         if (ret < 0)
1048                 return ret;
1049
1050         ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1051                                              cta_ip_nla_policy, NULL);
1052         if (ret)
1053                 return ret;
1054
1055         switch (tuple->src.l3num) {
1056         case NFPROTO_IPV4:
1057                 ret = ipv4_nlattr_to_tuple(tb, tuple);
1058                 break;
1059         case NFPROTO_IPV6:
1060                 ret = ipv6_nlattr_to_tuple(tb, tuple);
1061                 break;
1062         }
1063
1064         return ret;
1065 }
1066
1067 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1068         [CTA_PROTO_NUM] = { .type = NLA_U8 },
1069 };
1070
1071 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1072                                        struct nf_conntrack_tuple *tuple)
1073 {
1074         const struct nf_conntrack_l4proto *l4proto;
1075         struct nlattr *tb[CTA_PROTO_MAX+1];
1076         int ret = 0;
1077
1078         ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1079                                           proto_nla_policy, NULL);
1080         if (ret < 0)
1081                 return ret;
1082
1083         if (!tb[CTA_PROTO_NUM])
1084                 return -EINVAL;
1085         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1086
1087         rcu_read_lock();
1088         l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1089
1090         if (likely(l4proto->nlattr_to_tuple)) {
1091                 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1092                                                      l4proto->nla_policy,
1093                                                      NULL);
1094                 if (ret == 0)
1095                         ret = l4proto->nlattr_to_tuple(tb, tuple);
1096         }
1097
1098         rcu_read_unlock();
1099
1100         return ret;
1101 }
1102
1103 static int
1104 ctnetlink_parse_zone(const struct nlattr *attr,
1105                      struct nf_conntrack_zone *zone)
1106 {
1107         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1108                         NF_CT_DEFAULT_ZONE_DIR, 0);
1109 #ifdef CONFIG_NF_CONNTRACK_ZONES
1110         if (attr)
1111                 zone->id = ntohs(nla_get_be16(attr));
1112 #else
1113         if (attr)
1114                 return -EOPNOTSUPP;
1115 #endif
1116         return 0;
1117 }
1118
1119 static int
1120 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1121                            struct nf_conntrack_zone *zone)
1122 {
1123         int ret;
1124
1125         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1126                 return -EINVAL;
1127
1128         ret = ctnetlink_parse_zone(attr, zone);
1129         if (ret < 0)
1130                 return ret;
1131
1132         if (type == CTA_TUPLE_REPLY)
1133                 zone->dir = NF_CT_ZONE_DIR_REPL;
1134         else
1135                 zone->dir = NF_CT_ZONE_DIR_ORIG;
1136
1137         return 0;
1138 }
1139
1140 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1141         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
1142         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
1143         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
1144 };
1145
1146 static int
1147 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1148                       struct nf_conntrack_tuple *tuple, u32 type,
1149                       u_int8_t l3num, struct nf_conntrack_zone *zone)
1150 {
1151         struct nlattr *tb[CTA_TUPLE_MAX+1];
1152         int err;
1153
1154         memset(tuple, 0, sizeof(*tuple));
1155
1156         err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1157                                           tuple_nla_policy, NULL);
1158         if (err < 0)
1159                 return err;
1160
1161         if (!tb[CTA_TUPLE_IP])
1162                 return -EINVAL;
1163
1164         tuple->src.l3num = l3num;
1165
1166         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
1167         if (err < 0)
1168                 return err;
1169
1170         if (!tb[CTA_TUPLE_PROTO])
1171                 return -EINVAL;
1172
1173         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
1174         if (err < 0)
1175                 return err;
1176
1177         if (tb[CTA_TUPLE_ZONE]) {
1178                 if (!zone)
1179                         return -EINVAL;
1180
1181                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1182                                                  type, zone);
1183                 if (err < 0)
1184                         return err;
1185         }
1186
1187         /* orig and expect tuples get DIR_ORIGINAL */
1188         if (type == CTA_TUPLE_REPLY)
1189                 tuple->dst.dir = IP_CT_DIR_REPLY;
1190         else
1191                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1192
1193         return 0;
1194 }
1195
1196 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1197         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1198                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1199 };
1200
1201 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1202                                 struct nlattr **helpinfo)
1203 {
1204         int err;
1205         struct nlattr *tb[CTA_HELP_MAX+1];
1206
1207         err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1208                                           help_nla_policy, NULL);
1209         if (err < 0)
1210                 return err;
1211
1212         if (!tb[CTA_HELP_NAME])
1213                 return -EINVAL;
1214
1215         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1216
1217         if (tb[CTA_HELP_INFO])
1218                 *helpinfo = tb[CTA_HELP_INFO];
1219
1220         return 0;
1221 }
1222
1223 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1224         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1225         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1226         [CTA_STATUS]            = { .type = NLA_U32 },
1227         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1228         [CTA_HELP]              = { .type = NLA_NESTED },
1229         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1230         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1231         [CTA_MARK]              = { .type = NLA_U32 },
1232         [CTA_ID]                = { .type = NLA_U32 },
1233         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1234         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1235         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1236         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1237         [CTA_ZONE]              = { .type = NLA_U16 },
1238         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1239         [CTA_LABELS]            = { .type = NLA_BINARY,
1240                                     .len = NF_CT_LABELS_MAX_SIZE },
1241         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1242                                     .len = NF_CT_LABELS_MAX_SIZE },
1243 };
1244
1245 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1246 {
1247         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1248                 return 0;
1249
1250         return ctnetlink_filter_match(ct, data);
1251 }
1252
1253 static int ctnetlink_flush_conntrack(struct net *net,
1254                                      const struct nlattr * const cda[],
1255                                      u32 portid, int report, u8 family)
1256 {
1257         struct ctnetlink_filter *filter = NULL;
1258
1259         if (family || (cda[CTA_MARK] && cda[CTA_MARK_MASK])) {
1260                 filter = ctnetlink_alloc_filter(cda, family);
1261                 if (IS_ERR(filter))
1262                         return PTR_ERR(filter);
1263         }
1264
1265         nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1266                                   portid, report);
1267         kfree(filter);
1268
1269         return 0;
1270 }
1271
1272 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1273                                    struct sk_buff *skb,
1274                                    const struct nlmsghdr *nlh,
1275                                    const struct nlattr * const cda[],
1276                                    struct netlink_ext_ack *extack)
1277 {
1278         struct nf_conntrack_tuple_hash *h;
1279         struct nf_conntrack_tuple tuple;
1280         struct nf_conn *ct;
1281         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1282         struct nf_conntrack_zone zone;
1283         int err;
1284
1285         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1286         if (err < 0)
1287                 return err;
1288
1289         if (cda[CTA_TUPLE_ORIG])
1290                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1291                                             nfmsg->nfgen_family, &zone);
1292         else if (cda[CTA_TUPLE_REPLY])
1293                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1294                                             nfmsg->nfgen_family, &zone);
1295         else {
1296                 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1297
1298                 return ctnetlink_flush_conntrack(net, cda,
1299                                                  NETLINK_CB(skb).portid,
1300                                                  nlmsg_report(nlh), u3);
1301         }
1302
1303         if (err < 0)
1304                 return err;
1305
1306         h = nf_conntrack_find_get(net, &zone, &tuple);
1307         if (!h)
1308                 return -ENOENT;
1309
1310         ct = nf_ct_tuplehash_to_ctrack(h);
1311
1312         if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1313                 nf_ct_put(ct);
1314                 return -EBUSY;
1315         }
1316
1317         if (cda[CTA_ID]) {
1318                 __be32 id = nla_get_be32(cda[CTA_ID]);
1319
1320                 if (id != (__force __be32)nf_ct_get_id(ct)) {
1321                         nf_ct_put(ct);
1322                         return -ENOENT;
1323                 }
1324         }
1325
1326         nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1327         nf_ct_put(ct);
1328
1329         return 0;
1330 }
1331
1332 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1333                                    struct sk_buff *skb,
1334                                    const struct nlmsghdr *nlh,
1335                                    const struct nlattr * const cda[],
1336                                    struct netlink_ext_ack *extack)
1337 {
1338         struct nf_conntrack_tuple_hash *h;
1339         struct nf_conntrack_tuple tuple;
1340         struct nf_conn *ct;
1341         struct sk_buff *skb2 = NULL;
1342         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1343         u_int8_t u3 = nfmsg->nfgen_family;
1344         struct nf_conntrack_zone zone;
1345         int err;
1346
1347         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1348                 struct netlink_dump_control c = {
1349                         .start = ctnetlink_start,
1350                         .dump = ctnetlink_dump_table,
1351                         .done = ctnetlink_done,
1352                         .data = (void *)cda,
1353                 };
1354
1355                 return netlink_dump_start(ctnl, skb, nlh, &c);
1356         }
1357
1358         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1359         if (err < 0)
1360                 return err;
1361
1362         if (cda[CTA_TUPLE_ORIG])
1363                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1364                                             u3, &zone);
1365         else if (cda[CTA_TUPLE_REPLY])
1366                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1367                                             u3, &zone);
1368         else
1369                 return -EINVAL;
1370
1371         if (err < 0)
1372                 return err;
1373
1374         h = nf_conntrack_find_get(net, &zone, &tuple);
1375         if (!h)
1376                 return -ENOENT;
1377
1378         ct = nf_ct_tuplehash_to_ctrack(h);
1379
1380         err = -ENOMEM;
1381         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1382         if (skb2 == NULL) {
1383                 nf_ct_put(ct);
1384                 return -ENOMEM;
1385         }
1386
1387         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1388                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true);
1389         nf_ct_put(ct);
1390         if (err <= 0)
1391                 goto free;
1392
1393         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1394         if (err < 0)
1395                 goto out;
1396
1397         return 0;
1398
1399 free:
1400         kfree_skb(skb2);
1401 out:
1402         /* this avoids a loop in nfnetlink. */
1403         return err == -EAGAIN ? -ENOBUFS : err;
1404 }
1405
1406 static int ctnetlink_done_list(struct netlink_callback *cb)
1407 {
1408         if (cb->args[1])
1409                 nf_ct_put((struct nf_conn *)cb->args[1]);
1410         return 0;
1411 }
1412
1413 static int
1414 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1415 {
1416         struct nf_conn *ct, *last;
1417         struct nf_conntrack_tuple_hash *h;
1418         struct hlist_nulls_node *n;
1419         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1420         u_int8_t l3proto = nfmsg->nfgen_family;
1421         int res;
1422         int cpu;
1423         struct hlist_nulls_head *list;
1424         struct net *net = sock_net(skb->sk);
1425
1426         if (cb->args[2])
1427                 return 0;
1428
1429         last = (struct nf_conn *)cb->args[1];
1430
1431         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1432                 struct ct_pcpu *pcpu;
1433
1434                 if (!cpu_possible(cpu))
1435                         continue;
1436
1437                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1438                 spin_lock_bh(&pcpu->lock);
1439                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1440 restart:
1441                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1442                         ct = nf_ct_tuplehash_to_ctrack(h);
1443                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1444                                 continue;
1445                         if (cb->args[1]) {
1446                                 if (ct != last)
1447                                         continue;
1448                                 cb->args[1] = 0;
1449                         }
1450
1451                         /* We can't dump extension info for the unconfirmed
1452                          * list because unconfirmed conntracks can have
1453                          * ct->ext reallocated (and thus freed).
1454                          *
1455                          * In the dying list case ct->ext can't be free'd
1456                          * until after we drop pcpu->lock.
1457                          */
1458                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1459                                                   cb->nlh->nlmsg_seq,
1460                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1461                                                   ct, dying ? true : false);
1462                         if (res < 0) {
1463                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1464                                         continue;
1465                                 cb->args[0] = cpu;
1466                                 cb->args[1] = (unsigned long)ct;
1467                                 spin_unlock_bh(&pcpu->lock);
1468                                 goto out;
1469                         }
1470                 }
1471                 if (cb->args[1]) {
1472                         cb->args[1] = 0;
1473                         goto restart;
1474                 }
1475                 spin_unlock_bh(&pcpu->lock);
1476         }
1477         cb->args[2] = 1;
1478 out:
1479         if (last)
1480                 nf_ct_put(last);
1481
1482         return skb->len;
1483 }
1484
1485 static int
1486 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1487 {
1488         return ctnetlink_dump_list(skb, cb, true);
1489 }
1490
1491 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1492                                   struct sk_buff *skb,
1493                                   const struct nlmsghdr *nlh,
1494                                   const struct nlattr * const cda[],
1495                                   struct netlink_ext_ack *extack)
1496 {
1497         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1498                 struct netlink_dump_control c = {
1499                         .dump = ctnetlink_dump_dying,
1500                         .done = ctnetlink_done_list,
1501                 };
1502                 return netlink_dump_start(ctnl, skb, nlh, &c);
1503         }
1504
1505         return -EOPNOTSUPP;
1506 }
1507
1508 static int
1509 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1510 {
1511         return ctnetlink_dump_list(skb, cb, false);
1512 }
1513
1514 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1515                                         struct sk_buff *skb,
1516                                         const struct nlmsghdr *nlh,
1517                                         const struct nlattr * const cda[],
1518                                         struct netlink_ext_ack *extack)
1519 {
1520         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1521                 struct netlink_dump_control c = {
1522                         .dump = ctnetlink_dump_unconfirmed,
1523                         .done = ctnetlink_done_list,
1524                 };
1525                 return netlink_dump_start(ctnl, skb, nlh, &c);
1526         }
1527
1528         return -EOPNOTSUPP;
1529 }
1530
1531 #if IS_ENABLED(CONFIG_NF_NAT)
1532 static int
1533 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1534                           enum nf_nat_manip_type manip,
1535                           const struct nlattr *attr)
1536 {
1537         struct nf_nat_hook *nat_hook;
1538         int err;
1539
1540         nat_hook = rcu_dereference(nf_nat_hook);
1541         if (!nat_hook) {
1542 #ifdef CONFIG_MODULES
1543                 rcu_read_unlock();
1544                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1545                 if (request_module("nf-nat") < 0) {
1546                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1547                         rcu_read_lock();
1548                         return -EOPNOTSUPP;
1549                 }
1550                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1551                 rcu_read_lock();
1552                 nat_hook = rcu_dereference(nf_nat_hook);
1553                 if (nat_hook)
1554                         return -EAGAIN;
1555 #endif
1556                 return -EOPNOTSUPP;
1557         }
1558
1559         err = nat_hook->parse_nat_setup(ct, manip, attr);
1560         if (err == -EAGAIN) {
1561 #ifdef CONFIG_MODULES
1562                 rcu_read_unlock();
1563                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1564                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1565                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1566                         rcu_read_lock();
1567                         return -EOPNOTSUPP;
1568                 }
1569                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1570                 rcu_read_lock();
1571 #else
1572                 err = -EOPNOTSUPP;
1573 #endif
1574         }
1575         return err;
1576 }
1577 #endif
1578
1579 static void
1580 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1581                           unsigned long off)
1582 {
1583         unsigned int bit;
1584
1585         /* Ignore these unchangable bits */
1586         on &= ~IPS_UNCHANGEABLE_MASK;
1587         off &= ~IPS_UNCHANGEABLE_MASK;
1588
1589         for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1590                 if (on & (1 << bit))
1591                         set_bit(bit, &ct->status);
1592                 else if (off & (1 << bit))
1593                         clear_bit(bit, &ct->status);
1594         }
1595 }
1596
1597 static int
1598 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1599 {
1600         unsigned long d;
1601         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1602         d = ct->status ^ status;
1603
1604         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1605                 /* unchangeable */
1606                 return -EBUSY;
1607
1608         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1609                 /* SEEN_REPLY bit can only be set */
1610                 return -EBUSY;
1611
1612         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1613                 /* ASSURED bit can only be set */
1614                 return -EBUSY;
1615
1616         __ctnetlink_change_status(ct, status, 0);
1617         return 0;
1618 }
1619
1620 static int
1621 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1622 {
1623 #if IS_ENABLED(CONFIG_NF_NAT)
1624         int ret;
1625
1626         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1627                 return 0;
1628
1629         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1630                                         cda[CTA_NAT_DST]);
1631         if (ret < 0)
1632                 return ret;
1633
1634         return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1635                                          cda[CTA_NAT_SRC]);
1636 #else
1637         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1638                 return 0;
1639         return -EOPNOTSUPP;
1640 #endif
1641 }
1642
1643 static int ctnetlink_change_helper(struct nf_conn *ct,
1644                                    const struct nlattr * const cda[])
1645 {
1646         struct nf_conntrack_helper *helper;
1647         struct nf_conn_help *help = nfct_help(ct);
1648         char *helpname = NULL;
1649         struct nlattr *helpinfo = NULL;
1650         int err;
1651
1652         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1653         if (err < 0)
1654                 return err;
1655
1656         /* don't change helper of sibling connections */
1657         if (ct->master) {
1658                 /* If we try to change the helper to the same thing twice,
1659                  * treat the second attempt as a no-op instead of returning
1660                  * an error.
1661                  */
1662                 err = -EBUSY;
1663                 if (help) {
1664                         rcu_read_lock();
1665                         helper = rcu_dereference(help->helper);
1666                         if (helper && !strcmp(helper->name, helpname))
1667                                 err = 0;
1668                         rcu_read_unlock();
1669                 }
1670
1671                 return err;
1672         }
1673
1674         if (!strcmp(helpname, "")) {
1675                 if (help && help->helper) {
1676                         /* we had a helper before ... */
1677                         nf_ct_remove_expectations(ct);
1678                         RCU_INIT_POINTER(help->helper, NULL);
1679                 }
1680
1681                 return 0;
1682         }
1683
1684         rcu_read_lock();
1685         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1686                                             nf_ct_protonum(ct));
1687         if (helper == NULL) {
1688                 rcu_read_unlock();
1689                 return -EOPNOTSUPP;
1690         }
1691
1692         if (help) {
1693                 if (help->helper == helper) {
1694                         /* update private helper data if allowed. */
1695                         if (helper->from_nlattr)
1696                                 helper->from_nlattr(helpinfo, ct);
1697                         err = 0;
1698                 } else
1699                         err = -EBUSY;
1700         } else {
1701                 /* we cannot set a helper for an existing conntrack */
1702                 err = -EOPNOTSUPP;
1703         }
1704
1705         rcu_read_unlock();
1706         return err;
1707 }
1708
1709 static int ctnetlink_change_timeout(struct nf_conn *ct,
1710                                     const struct nlattr * const cda[])
1711 {
1712         u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1713
1714         if (timeout > INT_MAX)
1715                 timeout = INT_MAX;
1716         ct->timeout = nfct_time_stamp + (u32)timeout;
1717
1718         if (test_bit(IPS_DYING_BIT, &ct->status))
1719                 return -ETIME;
1720
1721         return 0;
1722 }
1723
1724 #if defined(CONFIG_NF_CONNTRACK_MARK)
1725 static void ctnetlink_change_mark(struct nf_conn *ct,
1726                                     const struct nlattr * const cda[])
1727 {
1728         u32 mark, newmark, mask = 0;
1729
1730         if (cda[CTA_MARK_MASK])
1731                 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1732
1733         mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1734         newmark = (ct->mark & mask) ^ mark;
1735         if (newmark != ct->mark)
1736                 ct->mark = newmark;
1737 }
1738 #endif
1739
1740 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1741         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1742         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1743         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1744 };
1745
1746 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
1747                                       const struct nlattr * const cda[])
1748 {
1749         const struct nlattr *attr = cda[CTA_PROTOINFO];
1750         const struct nf_conntrack_l4proto *l4proto;
1751         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1752         int err = 0;
1753
1754         err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
1755                                           protoinfo_policy, NULL);
1756         if (err < 0)
1757                 return err;
1758
1759         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
1760         if (l4proto->from_nlattr)
1761                 err = l4proto->from_nlattr(tb, ct);
1762
1763         return err;
1764 }
1765
1766 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1767         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1768         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1769         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1770 };
1771
1772 static int change_seq_adj(struct nf_ct_seqadj *seq,
1773                           const struct nlattr * const attr)
1774 {
1775         int err;
1776         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1777
1778         err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
1779                                           seqadj_policy, NULL);
1780         if (err < 0)
1781                 return err;
1782
1783         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1784                 return -EINVAL;
1785
1786         seq->correction_pos =
1787                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1788
1789         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1790                 return -EINVAL;
1791
1792         seq->offset_before =
1793                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1794
1795         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1796                 return -EINVAL;
1797
1798         seq->offset_after =
1799                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1800
1801         return 0;
1802 }
1803
1804 static int
1805 ctnetlink_change_seq_adj(struct nf_conn *ct,
1806                          const struct nlattr * const cda[])
1807 {
1808         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1809         int ret = 0;
1810
1811         if (!seqadj)
1812                 return 0;
1813
1814         spin_lock_bh(&ct->lock);
1815         if (cda[CTA_SEQ_ADJ_ORIG]) {
1816                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1817                                      cda[CTA_SEQ_ADJ_ORIG]);
1818                 if (ret < 0)
1819                         goto err;
1820
1821                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1822         }
1823
1824         if (cda[CTA_SEQ_ADJ_REPLY]) {
1825                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1826                                      cda[CTA_SEQ_ADJ_REPLY]);
1827                 if (ret < 0)
1828                         goto err;
1829
1830                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
1831         }
1832
1833         spin_unlock_bh(&ct->lock);
1834         return 0;
1835 err:
1836         spin_unlock_bh(&ct->lock);
1837         return ret;
1838 }
1839
1840 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
1841         [CTA_SYNPROXY_ISN]      = { .type = NLA_U32 },
1842         [CTA_SYNPROXY_ITS]      = { .type = NLA_U32 },
1843         [CTA_SYNPROXY_TSOFF]    = { .type = NLA_U32 },
1844 };
1845
1846 static int ctnetlink_change_synproxy(struct nf_conn *ct,
1847                                      const struct nlattr * const cda[])
1848 {
1849         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
1850         struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
1851         int err;
1852
1853         if (!synproxy)
1854                 return 0;
1855
1856         err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
1857                                           cda[CTA_SYNPROXY], synproxy_policy,
1858                                           NULL);
1859         if (err < 0)
1860                 return err;
1861
1862         if (!tb[CTA_SYNPROXY_ISN] ||
1863             !tb[CTA_SYNPROXY_ITS] ||
1864             !tb[CTA_SYNPROXY_TSOFF])
1865                 return -EINVAL;
1866
1867         synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
1868         synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
1869         synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
1870
1871         return 0;
1872 }
1873
1874 static int
1875 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1876 {
1877 #ifdef CONFIG_NF_CONNTRACK_LABELS
1878         size_t len = nla_len(cda[CTA_LABELS]);
1879         const void *mask = cda[CTA_LABELS_MASK];
1880
1881         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1882                 return -EINVAL;
1883
1884         if (mask) {
1885                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1886                     nla_len(cda[CTA_LABELS_MASK]) != len)
1887                         return -EINVAL;
1888                 mask = nla_data(cda[CTA_LABELS_MASK]);
1889         }
1890
1891         len /= sizeof(u32);
1892
1893         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1894 #else
1895         return -EOPNOTSUPP;
1896 #endif
1897 }
1898
1899 static int
1900 ctnetlink_change_conntrack(struct nf_conn *ct,
1901                            const struct nlattr * const cda[])
1902 {
1903         int err;
1904
1905         /* only allow NAT changes and master assignation for new conntracks */
1906         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1907                 return -EOPNOTSUPP;
1908
1909         if (cda[CTA_HELP]) {
1910                 err = ctnetlink_change_helper(ct, cda);
1911                 if (err < 0)
1912                         return err;
1913         }
1914
1915         if (cda[CTA_TIMEOUT]) {
1916                 err = ctnetlink_change_timeout(ct, cda);
1917                 if (err < 0)
1918                         return err;
1919         }
1920
1921         if (cda[CTA_STATUS]) {
1922                 err = ctnetlink_change_status(ct, cda);
1923                 if (err < 0)
1924                         return err;
1925         }
1926
1927         if (cda[CTA_PROTOINFO]) {
1928                 err = ctnetlink_change_protoinfo(ct, cda);
1929                 if (err < 0)
1930                         return err;
1931         }
1932
1933 #if defined(CONFIG_NF_CONNTRACK_MARK)
1934         if (cda[CTA_MARK])
1935                 ctnetlink_change_mark(ct, cda);
1936 #endif
1937
1938         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1939                 err = ctnetlink_change_seq_adj(ct, cda);
1940                 if (err < 0)
1941                         return err;
1942         }
1943
1944         if (cda[CTA_SYNPROXY]) {
1945                 err = ctnetlink_change_synproxy(ct, cda);
1946                 if (err < 0)
1947                         return err;
1948         }
1949
1950         if (cda[CTA_LABELS]) {
1951                 err = ctnetlink_attach_labels(ct, cda);
1952                 if (err < 0)
1953                         return err;
1954         }
1955
1956         return 0;
1957 }
1958
1959 static struct nf_conn *
1960 ctnetlink_create_conntrack(struct net *net,
1961                            const struct nf_conntrack_zone *zone,
1962                            const struct nlattr * const cda[],
1963                            struct nf_conntrack_tuple *otuple,
1964                            struct nf_conntrack_tuple *rtuple,
1965                            u8 u3)
1966 {
1967         struct nf_conn *ct;
1968         int err = -EINVAL;
1969         struct nf_conntrack_helper *helper;
1970         struct nf_conn_tstamp *tstamp;
1971         u64 timeout;
1972
1973         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1974         if (IS_ERR(ct))
1975                 return ERR_PTR(-ENOMEM);
1976
1977         if (!cda[CTA_TIMEOUT])
1978                 goto err1;
1979
1980         timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1981         if (timeout > INT_MAX)
1982                 timeout = INT_MAX;
1983         ct->timeout = (u32)timeout + nfct_time_stamp;
1984
1985         rcu_read_lock();
1986         if (cda[CTA_HELP]) {
1987                 char *helpname = NULL;
1988                 struct nlattr *helpinfo = NULL;
1989
1990                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1991                 if (err < 0)
1992                         goto err2;
1993
1994                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1995                                                     nf_ct_protonum(ct));
1996                 if (helper == NULL) {
1997                         rcu_read_unlock();
1998 #ifdef CONFIG_MODULES
1999                         if (request_module("nfct-helper-%s", helpname) < 0) {
2000                                 err = -EOPNOTSUPP;
2001                                 goto err1;
2002                         }
2003
2004                         rcu_read_lock();
2005                         helper = __nf_conntrack_helper_find(helpname,
2006                                                             nf_ct_l3num(ct),
2007                                                             nf_ct_protonum(ct));
2008                         if (helper) {
2009                                 err = -EAGAIN;
2010                                 goto err2;
2011                         }
2012                         rcu_read_unlock();
2013 #endif
2014                         err = -EOPNOTSUPP;
2015                         goto err1;
2016                 } else {
2017                         struct nf_conn_help *help;
2018
2019                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2020                         if (help == NULL) {
2021                                 err = -ENOMEM;
2022                                 goto err2;
2023                         }
2024                         /* set private helper data if allowed. */
2025                         if (helper->from_nlattr)
2026                                 helper->from_nlattr(helpinfo, ct);
2027
2028                         /* not in hash table yet so not strictly necessary */
2029                         RCU_INIT_POINTER(help->helper, helper);
2030                 }
2031         } else {
2032                 /* try an implicit helper assignation */
2033                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2034                 if (err < 0)
2035                         goto err2;
2036         }
2037
2038         err = ctnetlink_setup_nat(ct, cda);
2039         if (err < 0)
2040                 goto err2;
2041
2042         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2043         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2044         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2045         nf_ct_labels_ext_add(ct);
2046         nfct_seqadj_ext_add(ct);
2047         nfct_synproxy_ext_add(ct);
2048
2049         /* we must add conntrack extensions before confirmation. */
2050         ct->status |= IPS_CONFIRMED;
2051
2052         if (cda[CTA_STATUS]) {
2053                 err = ctnetlink_change_status(ct, cda);
2054                 if (err < 0)
2055                         goto err2;
2056         }
2057
2058         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2059                 err = ctnetlink_change_seq_adj(ct, cda);
2060                 if (err < 0)
2061                         goto err2;
2062         }
2063
2064         memset(&ct->proto, 0, sizeof(ct->proto));
2065         if (cda[CTA_PROTOINFO]) {
2066                 err = ctnetlink_change_protoinfo(ct, cda);
2067                 if (err < 0)
2068                         goto err2;
2069         }
2070
2071         if (cda[CTA_SYNPROXY]) {
2072                 err = ctnetlink_change_synproxy(ct, cda);
2073                 if (err < 0)
2074                         goto err2;
2075         }
2076
2077 #if defined(CONFIG_NF_CONNTRACK_MARK)
2078         if (cda[CTA_MARK])
2079                 ctnetlink_change_mark(ct, cda);
2080 #endif
2081
2082         /* setup master conntrack: this is a confirmed expectation */
2083         if (cda[CTA_TUPLE_MASTER]) {
2084                 struct nf_conntrack_tuple master;
2085                 struct nf_conntrack_tuple_hash *master_h;
2086                 struct nf_conn *master_ct;
2087
2088                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2089                                             u3, NULL);
2090                 if (err < 0)
2091                         goto err2;
2092
2093                 master_h = nf_conntrack_find_get(net, zone, &master);
2094                 if (master_h == NULL) {
2095                         err = -ENOENT;
2096                         goto err2;
2097                 }
2098                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2099                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2100                 ct->master = master_ct;
2101         }
2102         tstamp = nf_conn_tstamp_find(ct);
2103         if (tstamp)
2104                 tstamp->start = ktime_get_real_ns();
2105
2106         err = nf_conntrack_hash_check_insert(ct);
2107         if (err < 0)
2108                 goto err2;
2109
2110         rcu_read_unlock();
2111
2112         return ct;
2113
2114 err2:
2115         rcu_read_unlock();
2116 err1:
2117         nf_conntrack_free(ct);
2118         return ERR_PTR(err);
2119 }
2120
2121 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2122                                    struct sk_buff *skb,
2123                                    const struct nlmsghdr *nlh,
2124                                    const struct nlattr * const cda[],
2125                                    struct netlink_ext_ack *extack)
2126 {
2127         struct nf_conntrack_tuple otuple, rtuple;
2128         struct nf_conntrack_tuple_hash *h = NULL;
2129         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2130         struct nf_conn *ct;
2131         u_int8_t u3 = nfmsg->nfgen_family;
2132         struct nf_conntrack_zone zone;
2133         int err;
2134
2135         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2136         if (err < 0)
2137                 return err;
2138
2139         if (cda[CTA_TUPLE_ORIG]) {
2140                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2141                                             u3, &zone);
2142                 if (err < 0)
2143                         return err;
2144         }
2145
2146         if (cda[CTA_TUPLE_REPLY]) {
2147                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2148                                             u3, &zone);
2149                 if (err < 0)
2150                         return err;
2151         }
2152
2153         if (cda[CTA_TUPLE_ORIG])
2154                 h = nf_conntrack_find_get(net, &zone, &otuple);
2155         else if (cda[CTA_TUPLE_REPLY])
2156                 h = nf_conntrack_find_get(net, &zone, &rtuple);
2157
2158         if (h == NULL) {
2159                 err = -ENOENT;
2160                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2161                         enum ip_conntrack_events events;
2162
2163                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2164                                 return -EINVAL;
2165                         if (otuple.dst.protonum != rtuple.dst.protonum)
2166                                 return -EINVAL;
2167
2168                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2169                                                         &rtuple, u3);
2170                         if (IS_ERR(ct))
2171                                 return PTR_ERR(ct);
2172
2173                         err = 0;
2174                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2175                                 events = 1 << IPCT_RELATED;
2176                         else
2177                                 events = 1 << IPCT_NEW;
2178
2179                         if (cda[CTA_LABELS] &&
2180                             ctnetlink_attach_labels(ct, cda) == 0)
2181                                 events |= (1 << IPCT_LABEL);
2182
2183                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2184                                                       (1 << IPCT_ASSURED) |
2185                                                       (1 << IPCT_HELPER) |
2186                                                       (1 << IPCT_PROTOINFO) |
2187                                                       (1 << IPCT_SEQADJ) |
2188                                                       (1 << IPCT_MARK) |
2189                                                       (1 << IPCT_SYNPROXY) |
2190                                                       events,
2191                                                       ct, NETLINK_CB(skb).portid,
2192                                                       nlmsg_report(nlh));
2193                         nf_ct_put(ct);
2194                 }
2195
2196                 return err;
2197         }
2198         /* implicit 'else' */
2199
2200         err = -EEXIST;
2201         ct = nf_ct_tuplehash_to_ctrack(h);
2202         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2203                 err = ctnetlink_change_conntrack(ct, cda);
2204                 if (err == 0) {
2205                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2206                                                       (1 << IPCT_ASSURED) |
2207                                                       (1 << IPCT_HELPER) |
2208                                                       (1 << IPCT_LABEL) |
2209                                                       (1 << IPCT_PROTOINFO) |
2210                                                       (1 << IPCT_SEQADJ) |
2211                                                       (1 << IPCT_MARK) |
2212                                                       (1 << IPCT_SYNPROXY),
2213                                                       ct, NETLINK_CB(skb).portid,
2214                                                       nlmsg_report(nlh));
2215                 }
2216         }
2217
2218         nf_ct_put(ct);
2219         return err;
2220 }
2221
2222 static int
2223 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2224                                 __u16 cpu, const struct ip_conntrack_stat *st)
2225 {
2226         struct nlmsghdr *nlh;
2227         struct nfgenmsg *nfmsg;
2228         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2229
2230         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2231                               IPCTNL_MSG_CT_GET_STATS_CPU);
2232         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2233         if (nlh == NULL)
2234                 goto nlmsg_failure;
2235
2236         nfmsg = nlmsg_data(nlh);
2237         nfmsg->nfgen_family = AF_UNSPEC;
2238         nfmsg->version      = NFNETLINK_V0;
2239         nfmsg->res_id       = htons(cpu);
2240
2241         if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2242             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2243             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
2244             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2245             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2246                                 htonl(st->insert_failed)) ||
2247             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2248             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2249             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2250             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2251                                 htonl(st->search_restart)))
2252                 goto nla_put_failure;
2253
2254         nlmsg_end(skb, nlh);
2255         return skb->len;
2256
2257 nla_put_failure:
2258 nlmsg_failure:
2259         nlmsg_cancel(skb, nlh);
2260         return -1;
2261 }
2262
2263 static int
2264 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2265 {
2266         int cpu;
2267         struct net *net = sock_net(skb->sk);
2268
2269         if (cb->args[0] == nr_cpu_ids)
2270                 return 0;
2271
2272         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2273                 const struct ip_conntrack_stat *st;
2274
2275                 if (!cpu_possible(cpu))
2276                         continue;
2277
2278                 st = per_cpu_ptr(net->ct.stat, cpu);
2279                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2280                                                     NETLINK_CB(cb->skb).portid,
2281                                                     cb->nlh->nlmsg_seq,
2282                                                     cpu, st) < 0)
2283                                 break;
2284         }
2285         cb->args[0] = cpu;
2286
2287         return skb->len;
2288 }
2289
2290 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2291                                  struct sk_buff *skb,
2292                                  const struct nlmsghdr *nlh,
2293                                  const struct nlattr * const cda[],
2294                                  struct netlink_ext_ack *extack)
2295 {
2296         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2297                 struct netlink_dump_control c = {
2298                         .dump = ctnetlink_ct_stat_cpu_dump,
2299                 };
2300                 return netlink_dump_start(ctnl, skb, nlh, &c);
2301         }
2302
2303         return 0;
2304 }
2305
2306 static int
2307 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2308                             struct net *net)
2309 {
2310         struct nlmsghdr *nlh;
2311         struct nfgenmsg *nfmsg;
2312         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2313         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2314
2315         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2316         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2317         if (nlh == NULL)
2318                 goto nlmsg_failure;
2319
2320         nfmsg = nlmsg_data(nlh);
2321         nfmsg->nfgen_family = AF_UNSPEC;
2322         nfmsg->version      = NFNETLINK_V0;
2323         nfmsg->res_id       = 0;
2324
2325         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2326                 goto nla_put_failure;
2327
2328         if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2329                 goto nla_put_failure;
2330
2331         nlmsg_end(skb, nlh);
2332         return skb->len;
2333
2334 nla_put_failure:
2335 nlmsg_failure:
2336         nlmsg_cancel(skb, nlh);
2337         return -1;
2338 }
2339
2340 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2341                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2342                              const struct nlattr * const cda[],
2343                              struct netlink_ext_ack *extack)
2344 {
2345         struct sk_buff *skb2;
2346         int err;
2347
2348         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2349         if (skb2 == NULL)
2350                 return -ENOMEM;
2351
2352         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2353                                           nlh->nlmsg_seq,
2354                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2355                                           sock_net(skb->sk));
2356         if (err <= 0)
2357                 goto free;
2358
2359         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2360         if (err < 0)
2361                 goto out;
2362
2363         return 0;
2364
2365 free:
2366         kfree_skb(skb2);
2367 out:
2368         /* this avoids a loop in nfnetlink. */
2369         return err == -EAGAIN ? -ENOBUFS : err;
2370 }
2371
2372 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2373         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2374         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2375         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2376         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2377         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2378         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2379                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2380         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2381         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2382         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2383         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2384         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2385 };
2386
2387 static struct nf_conntrack_expect *
2388 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2389                        struct nf_conntrack_helper *helper,
2390                        struct nf_conntrack_tuple *tuple,
2391                        struct nf_conntrack_tuple *mask);
2392
2393 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2394 static size_t
2395 ctnetlink_glue_build_size(const struct nf_conn *ct)
2396 {
2397         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2398                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2399                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2400                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2401                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2402                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2403                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2404                + nla_total_size(0) /* CTA_PROTOINFO */
2405                + nla_total_size(0) /* CTA_HELP */
2406                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2407                + ctnetlink_secctx_size(ct)
2408 #if IS_ENABLED(CONFIG_NF_NAT)
2409                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2410                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2411 #endif
2412 #ifdef CONFIG_NF_CONNTRACK_MARK
2413                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2414 #endif
2415 #ifdef CONFIG_NF_CONNTRACK_ZONES
2416                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2417 #endif
2418                + ctnetlink_proto_size(ct)
2419                ;
2420 }
2421
2422 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2423                                              enum ip_conntrack_info *ctinfo)
2424 {
2425         return nf_ct_get(skb, ctinfo);
2426 }
2427
2428 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2429 {
2430         const struct nf_conntrack_zone *zone;
2431         struct nlattr *nest_parms;
2432
2433         zone = nf_ct_zone(ct);
2434
2435         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2436         if (!nest_parms)
2437                 goto nla_put_failure;
2438         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2439                 goto nla_put_failure;
2440         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2441                                    NF_CT_ZONE_DIR_ORIG) < 0)
2442                 goto nla_put_failure;
2443         nla_nest_end(skb, nest_parms);
2444
2445         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2446         if (!nest_parms)
2447                 goto nla_put_failure;
2448         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2449                 goto nla_put_failure;
2450         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2451                                    NF_CT_ZONE_DIR_REPL) < 0)
2452                 goto nla_put_failure;
2453         nla_nest_end(skb, nest_parms);
2454
2455         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2456                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2457                 goto nla_put_failure;
2458
2459         if (ctnetlink_dump_id(skb, ct) < 0)
2460                 goto nla_put_failure;
2461
2462         if (ctnetlink_dump_status(skb, ct) < 0)
2463                 goto nla_put_failure;
2464
2465         if (ctnetlink_dump_timeout(skb, ct) < 0)
2466                 goto nla_put_failure;
2467
2468         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2469                 goto nla_put_failure;
2470
2471         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2472                 goto nla_put_failure;
2473
2474 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2475         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2476                 goto nla_put_failure;
2477 #endif
2478         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2479                 goto nla_put_failure;
2480
2481         if ((ct->status & IPS_SEQ_ADJUST) &&
2482             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2483                 goto nla_put_failure;
2484
2485         if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2486                 goto nla_put_failure;
2487
2488 #ifdef CONFIG_NF_CONNTRACK_MARK
2489         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2490                 goto nla_put_failure;
2491 #endif
2492         if (ctnetlink_dump_labels(skb, ct) < 0)
2493                 goto nla_put_failure;
2494         return 0;
2495
2496 nla_put_failure:
2497         return -ENOSPC;
2498 }
2499
2500 static int
2501 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2502                      enum ip_conntrack_info ctinfo,
2503                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2504 {
2505         struct nlattr *nest_parms;
2506
2507         nest_parms = nla_nest_start(skb, ct_attr);
2508         if (!nest_parms)
2509                 goto nla_put_failure;
2510
2511         if (__ctnetlink_glue_build(skb, ct) < 0)
2512                 goto nla_put_failure;
2513
2514         nla_nest_end(skb, nest_parms);
2515
2516         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2517                 goto nla_put_failure;
2518
2519         return 0;
2520
2521 nla_put_failure:
2522         return -ENOSPC;
2523 }
2524
2525 static int
2526 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2527 {
2528         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2529         unsigned long d = ct->status ^ status;
2530
2531         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2532                 /* SEEN_REPLY bit can only be set */
2533                 return -EBUSY;
2534
2535         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2536                 /* ASSURED bit can only be set */
2537                 return -EBUSY;
2538
2539         /* This check is less strict than ctnetlink_change_status()
2540          * because callers often flip IPS_EXPECTED bits when sending
2541          * an NFQA_CT attribute to the kernel.  So ignore the
2542          * unchangeable bits but do not error out. Also user programs
2543          * are allowed to clear the bits that they are allowed to change.
2544          */
2545         __ctnetlink_change_status(ct, status, ~status);
2546         return 0;
2547 }
2548
2549 static int
2550 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2551 {
2552         int err;
2553
2554         if (cda[CTA_TIMEOUT]) {
2555                 err = ctnetlink_change_timeout(ct, cda);
2556                 if (err < 0)
2557                         return err;
2558         }
2559         if (cda[CTA_STATUS]) {
2560                 err = ctnetlink_update_status(ct, cda);
2561                 if (err < 0)
2562                         return err;
2563         }
2564         if (cda[CTA_HELP]) {
2565                 err = ctnetlink_change_helper(ct, cda);
2566                 if (err < 0)
2567                         return err;
2568         }
2569         if (cda[CTA_LABELS]) {
2570                 err = ctnetlink_attach_labels(ct, cda);
2571                 if (err < 0)
2572                         return err;
2573         }
2574 #if defined(CONFIG_NF_CONNTRACK_MARK)
2575         if (cda[CTA_MARK]) {
2576                 ctnetlink_change_mark(ct, cda);
2577         }
2578 #endif
2579         return 0;
2580 }
2581
2582 static int
2583 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2584 {
2585         struct nlattr *cda[CTA_MAX+1];
2586         int ret;
2587
2588         ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2589                                           NULL);
2590         if (ret < 0)
2591                 return ret;
2592
2593         return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2594 }
2595
2596 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2597                                     const struct nf_conn *ct,
2598                                     struct nf_conntrack_tuple *tuple,
2599                                     struct nf_conntrack_tuple *mask)
2600 {
2601         int err;
2602
2603         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2604                                     nf_ct_l3num(ct), NULL);
2605         if (err < 0)
2606                 return err;
2607
2608         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2609                                      nf_ct_l3num(ct), NULL);
2610 }
2611
2612 static int
2613 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2614                              u32 portid, u32 report)
2615 {
2616         struct nlattr *cda[CTA_EXPECT_MAX+1];
2617         struct nf_conntrack_tuple tuple, mask;
2618         struct nf_conntrack_helper *helper = NULL;
2619         struct nf_conntrack_expect *exp;
2620         int err;
2621
2622         err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2623                                           exp_nla_policy, NULL);
2624         if (err < 0)
2625                 return err;
2626
2627         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2628                                        ct, &tuple, &mask);
2629         if (err < 0)
2630                 return err;
2631
2632         if (cda[CTA_EXPECT_HELP_NAME]) {
2633                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2634
2635                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2636                                                     nf_ct_protonum(ct));
2637                 if (helper == NULL)
2638                         return -EOPNOTSUPP;
2639         }
2640
2641         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2642                                      helper, &tuple, &mask);
2643         if (IS_ERR(exp))
2644                 return PTR_ERR(exp);
2645
2646         err = nf_ct_expect_related_report(exp, portid, report, 0);
2647         nf_ct_expect_put(exp);
2648         return err;
2649 }
2650
2651 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2652                                   enum ip_conntrack_info ctinfo, int diff)
2653 {
2654         if (!(ct->status & IPS_NAT_MASK))
2655                 return;
2656
2657         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2658 }
2659
2660 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2661         .get_ct         = ctnetlink_glue_get_ct,
2662         .build_size     = ctnetlink_glue_build_size,
2663         .build          = ctnetlink_glue_build,
2664         .parse          = ctnetlink_glue_parse,
2665         .attach_expect  = ctnetlink_glue_attach_expect,
2666         .seq_adjust     = ctnetlink_glue_seqadj,
2667 };
2668 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2669
2670 /***********************************************************************
2671  * EXPECT
2672  ***********************************************************************/
2673
2674 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2675                                     const struct nf_conntrack_tuple *tuple,
2676                                     u32 type)
2677 {
2678         struct nlattr *nest_parms;
2679
2680         nest_parms = nla_nest_start(skb, type);
2681         if (!nest_parms)
2682                 goto nla_put_failure;
2683         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2684                 goto nla_put_failure;
2685         nla_nest_end(skb, nest_parms);
2686
2687         return 0;
2688
2689 nla_put_failure:
2690         return -1;
2691 }
2692
2693 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2694                                    const struct nf_conntrack_tuple *tuple,
2695                                    const struct nf_conntrack_tuple_mask *mask)
2696 {
2697         const struct nf_conntrack_l4proto *l4proto;
2698         struct nf_conntrack_tuple m;
2699         struct nlattr *nest_parms;
2700         int ret;
2701
2702         memset(&m, 0xFF, sizeof(m));
2703         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2704         m.src.u.all = mask->src.u.all;
2705         m.dst.protonum = tuple->dst.protonum;
2706
2707         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2708         if (!nest_parms)
2709                 goto nla_put_failure;
2710
2711         rcu_read_lock();
2712         ret = ctnetlink_dump_tuples_ip(skb, &m);
2713         if (ret >= 0) {
2714                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2715                 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2716         }
2717         rcu_read_unlock();
2718
2719         if (unlikely(ret < 0))
2720                 goto nla_put_failure;
2721
2722         nla_nest_end(skb, nest_parms);
2723
2724         return 0;
2725
2726 nla_put_failure:
2727         return -1;
2728 }
2729
2730 static const union nf_inet_addr any_addr;
2731
2732 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
2733 {
2734         static __read_mostly siphash_key_t exp_id_seed;
2735         unsigned long a, b, c, d;
2736
2737         net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
2738
2739         a = (unsigned long)exp;
2740         b = (unsigned long)exp->helper;
2741         c = (unsigned long)exp->master;
2742         d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
2743
2744 #ifdef CONFIG_64BIT
2745         return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
2746 #else
2747         return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
2748 #endif
2749 }
2750
2751 static int
2752 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2753                           const struct nf_conntrack_expect *exp)
2754 {
2755         struct nf_conn *master = exp->master;
2756         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2757         struct nf_conn_help *help;
2758 #if IS_ENABLED(CONFIG_NF_NAT)
2759         struct nlattr *nest_parms;
2760         struct nf_conntrack_tuple nat_tuple = {};
2761 #endif
2762         struct nf_ct_helper_expectfn *expfn;
2763
2764         if (timeout < 0)
2765                 timeout = 0;
2766
2767         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2768                 goto nla_put_failure;
2769         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2770                 goto nla_put_failure;
2771         if (ctnetlink_exp_dump_tuple(skb,
2772                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2773                                  CTA_EXPECT_MASTER) < 0)
2774                 goto nla_put_failure;
2775
2776 #if IS_ENABLED(CONFIG_NF_NAT)
2777         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2778             exp->saved_proto.all) {
2779                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
2780                 if (!nest_parms)
2781                         goto nla_put_failure;
2782
2783                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2784                         goto nla_put_failure;
2785
2786                 nat_tuple.src.l3num = nf_ct_l3num(master);
2787                 nat_tuple.src.u3 = exp->saved_addr;
2788                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2789                 nat_tuple.src.u = exp->saved_proto;
2790
2791                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2792                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2793                         goto nla_put_failure;
2794                 nla_nest_end(skb, nest_parms);
2795         }
2796 #endif
2797         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2798             nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
2799             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2800             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2801                 goto nla_put_failure;
2802         help = nfct_help(master);
2803         if (help) {
2804                 struct nf_conntrack_helper *helper;
2805
2806                 helper = rcu_dereference(help->helper);
2807                 if (helper &&
2808                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2809                         goto nla_put_failure;
2810         }
2811         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2812         if (expfn != NULL &&
2813             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2814                 goto nla_put_failure;
2815
2816         return 0;
2817
2818 nla_put_failure:
2819         return -1;
2820 }
2821
2822 static int
2823 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2824                         int event, const struct nf_conntrack_expect *exp)
2825 {
2826         struct nlmsghdr *nlh;
2827         struct nfgenmsg *nfmsg;
2828         unsigned int flags = portid ? NLM_F_MULTI : 0;
2829
2830         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
2831         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2832         if (nlh == NULL)
2833                 goto nlmsg_failure;
2834
2835         nfmsg = nlmsg_data(nlh);
2836         nfmsg->nfgen_family = exp->tuple.src.l3num;
2837         nfmsg->version      = NFNETLINK_V0;
2838         nfmsg->res_id       = 0;
2839
2840         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2841                 goto nla_put_failure;
2842
2843         nlmsg_end(skb, nlh);
2844         return skb->len;
2845
2846 nlmsg_failure:
2847 nla_put_failure:
2848         nlmsg_cancel(skb, nlh);
2849         return -1;
2850 }
2851
2852 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2853 static int
2854 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2855 {
2856         struct nf_conntrack_expect *exp = item->exp;
2857         struct net *net = nf_ct_exp_net(exp);
2858         struct nlmsghdr *nlh;
2859         struct nfgenmsg *nfmsg;
2860         struct sk_buff *skb;
2861         unsigned int type, group;
2862         int flags = 0;
2863
2864         if (events & (1 << IPEXP_DESTROY)) {
2865                 type = IPCTNL_MSG_EXP_DELETE;
2866                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2867         } else if (events & (1 << IPEXP_NEW)) {
2868                 type = IPCTNL_MSG_EXP_NEW;
2869                 flags = NLM_F_CREATE|NLM_F_EXCL;
2870                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2871         } else
2872                 return 0;
2873
2874         if (!item->report && !nfnetlink_has_listeners(net, group))
2875                 return 0;
2876
2877         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2878         if (skb == NULL)
2879                 goto errout;
2880
2881         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
2882         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2883         if (nlh == NULL)
2884                 goto nlmsg_failure;
2885
2886         nfmsg = nlmsg_data(nlh);
2887         nfmsg->nfgen_family = exp->tuple.src.l3num;
2888         nfmsg->version      = NFNETLINK_V0;
2889         nfmsg->res_id       = 0;
2890
2891         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2892                 goto nla_put_failure;
2893
2894         nlmsg_end(skb, nlh);
2895         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2896         return 0;
2897
2898 nla_put_failure:
2899         nlmsg_cancel(skb, nlh);
2900 nlmsg_failure:
2901         kfree_skb(skb);
2902 errout:
2903         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2904         return 0;
2905 }
2906 #endif
2907 static int ctnetlink_exp_done(struct netlink_callback *cb)
2908 {
2909         if (cb->args[1])
2910                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2911         return 0;
2912 }
2913
2914 static int
2915 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2916 {
2917         struct net *net = sock_net(skb->sk);
2918         struct nf_conntrack_expect *exp, *last;
2919         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2920         u_int8_t l3proto = nfmsg->nfgen_family;
2921
2922         rcu_read_lock();
2923         last = (struct nf_conntrack_expect *)cb->args[1];
2924         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2925 restart:
2926                 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
2927                                          hnode) {
2928                         if (l3proto && exp->tuple.src.l3num != l3proto)
2929                                 continue;
2930
2931                         if (!net_eq(nf_ct_net(exp->master), net))
2932                                 continue;
2933
2934                         if (cb->args[1]) {
2935                                 if (exp != last)
2936                                         continue;
2937                                 cb->args[1] = 0;
2938                         }
2939                         if (ctnetlink_exp_fill_info(skb,
2940                                                     NETLINK_CB(cb->skb).portid,
2941                                                     cb->nlh->nlmsg_seq,
2942                                                     IPCTNL_MSG_EXP_NEW,
2943                                                     exp) < 0) {
2944                                 if (!refcount_inc_not_zero(&exp->use))
2945                                         continue;
2946                                 cb->args[1] = (unsigned long)exp;
2947                                 goto out;
2948                         }
2949                 }
2950                 if (cb->args[1]) {
2951                         cb->args[1] = 0;
2952                         goto restart;
2953                 }
2954         }
2955 out:
2956         rcu_read_unlock();
2957         if (last)
2958                 nf_ct_expect_put(last);
2959
2960         return skb->len;
2961 }
2962
2963 static int
2964 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2965 {
2966         struct nf_conntrack_expect *exp, *last;
2967         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2968         struct nf_conn *ct = cb->data;
2969         struct nf_conn_help *help = nfct_help(ct);
2970         u_int8_t l3proto = nfmsg->nfgen_family;
2971
2972         if (cb->args[0])
2973                 return 0;
2974
2975         rcu_read_lock();
2976         last = (struct nf_conntrack_expect *)cb->args[1];
2977 restart:
2978         hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
2979                 if (l3proto && exp->tuple.src.l3num != l3proto)
2980                         continue;
2981                 if (cb->args[1]) {
2982                         if (exp != last)
2983                                 continue;
2984                         cb->args[1] = 0;
2985                 }
2986                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2987                                             cb->nlh->nlmsg_seq,
2988                                             IPCTNL_MSG_EXP_NEW,
2989                                             exp) < 0) {
2990                         if (!refcount_inc_not_zero(&exp->use))
2991                                 continue;
2992                         cb->args[1] = (unsigned long)exp;
2993                         goto out;
2994                 }
2995         }
2996         if (cb->args[1]) {
2997                 cb->args[1] = 0;
2998                 goto restart;
2999         }
3000         cb->args[0] = 1;
3001 out:
3002         rcu_read_unlock();
3003         if (last)
3004                 nf_ct_expect_put(last);
3005
3006         return skb->len;
3007 }
3008
3009 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3010                                  struct sk_buff *skb,
3011                                  const struct nlmsghdr *nlh,
3012                                  const struct nlattr * const cda[],
3013                                  struct netlink_ext_ack *extack)
3014 {
3015         int err;
3016         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3017         u_int8_t u3 = nfmsg->nfgen_family;
3018         struct nf_conntrack_tuple tuple;
3019         struct nf_conntrack_tuple_hash *h;
3020         struct nf_conn *ct;
3021         struct nf_conntrack_zone zone;
3022         struct netlink_dump_control c = {
3023                 .dump = ctnetlink_exp_ct_dump_table,
3024                 .done = ctnetlink_exp_done,
3025         };
3026
3027         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3028                                     u3, NULL);
3029         if (err < 0)
3030                 return err;
3031
3032         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3033         if (err < 0)
3034                 return err;
3035
3036         h = nf_conntrack_find_get(net, &zone, &tuple);
3037         if (!h)
3038                 return -ENOENT;
3039
3040         ct = nf_ct_tuplehash_to_ctrack(h);
3041         /* No expectation linked to this connection tracking. */
3042         if (!nfct_help(ct)) {
3043                 nf_ct_put(ct);
3044                 return 0;
3045         }
3046
3047         c.data = ct;
3048
3049         err = netlink_dump_start(ctnl, skb, nlh, &c);
3050         nf_ct_put(ct);
3051
3052         return err;
3053 }
3054
3055 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3056                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3057                                 const struct nlattr * const cda[],
3058                                 struct netlink_ext_ack *extack)
3059 {
3060         struct nf_conntrack_tuple tuple;
3061         struct nf_conntrack_expect *exp;
3062         struct sk_buff *skb2;
3063         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3064         u_int8_t u3 = nfmsg->nfgen_family;
3065         struct nf_conntrack_zone zone;
3066         int err;
3067
3068         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3069                 if (cda[CTA_EXPECT_MASTER])
3070                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3071                                                      extack);
3072                 else {
3073                         struct netlink_dump_control c = {
3074                                 .dump = ctnetlink_exp_dump_table,
3075                                 .done = ctnetlink_exp_done,
3076                         };
3077                         return netlink_dump_start(ctnl, skb, nlh, &c);
3078                 }
3079         }
3080
3081         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3082         if (err < 0)
3083                 return err;
3084
3085         if (cda[CTA_EXPECT_TUPLE])
3086                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3087                                             u3, NULL);
3088         else if (cda[CTA_EXPECT_MASTER])
3089                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3090                                             u3, NULL);
3091         else
3092                 return -EINVAL;
3093
3094         if (err < 0)
3095                 return err;
3096
3097         exp = nf_ct_expect_find_get(net, &zone, &tuple);
3098         if (!exp)
3099                 return -ENOENT;
3100
3101         if (cda[CTA_EXPECT_ID]) {
3102                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3103
3104                 if (id != nf_expect_get_id(exp)) {
3105                         nf_ct_expect_put(exp);
3106                         return -ENOENT;
3107                 }
3108         }
3109
3110         err = -ENOMEM;
3111         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3112         if (skb2 == NULL) {
3113                 nf_ct_expect_put(exp);
3114                 goto out;
3115         }
3116
3117         rcu_read_lock();
3118         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3119                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3120         rcu_read_unlock();
3121         nf_ct_expect_put(exp);
3122         if (err <= 0)
3123                 goto free;
3124
3125         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3126         if (err < 0)
3127                 goto out;
3128
3129         return 0;
3130
3131 free:
3132         kfree_skb(skb2);
3133 out:
3134         /* this avoids a loop in nfnetlink. */
3135         return err == -EAGAIN ? -ENOBUFS : err;
3136 }
3137
3138 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3139 {
3140         const struct nf_conn_help *m_help;
3141         const char *name = data;
3142
3143         m_help = nfct_help(exp->master);
3144
3145         return strcmp(m_help->helper->name, name) == 0;
3146 }
3147
3148 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3149 {
3150         return true;
3151 }
3152
3153 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3154                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3155                                 const struct nlattr * const cda[],
3156                                 struct netlink_ext_ack *extack)
3157 {
3158         struct nf_conntrack_expect *exp;
3159         struct nf_conntrack_tuple tuple;
3160         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3161         u_int8_t u3 = nfmsg->nfgen_family;
3162         struct nf_conntrack_zone zone;
3163         int err;
3164
3165         if (cda[CTA_EXPECT_TUPLE]) {
3166                 /* delete a single expect by tuple */
3167                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3168                 if (err < 0)
3169                         return err;
3170
3171                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3172                                             u3, NULL);
3173                 if (err < 0)
3174                         return err;
3175
3176                 /* bump usage count to 2 */
3177                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3178                 if (!exp)
3179                         return -ENOENT;
3180
3181                 if (cda[CTA_EXPECT_ID]) {
3182                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3183                         if (ntohl(id) != (u32)(unsigned long)exp) {
3184                                 nf_ct_expect_put(exp);
3185                                 return -ENOENT;
3186                         }
3187                 }
3188
3189                 /* after list removal, usage count == 1 */
3190                 spin_lock_bh(&nf_conntrack_expect_lock);
3191                 if (del_timer(&exp->timeout)) {
3192                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3193                                                    nlmsg_report(nlh));
3194                         nf_ct_expect_put(exp);
3195                 }
3196                 spin_unlock_bh(&nf_conntrack_expect_lock);
3197                 /* have to put what we 'get' above.
3198                  * after this line usage count == 0 */
3199                 nf_ct_expect_put(exp);
3200         } else if (cda[CTA_EXPECT_HELP_NAME]) {
3201                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3202
3203                 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3204                                          NETLINK_CB(skb).portid,
3205                                          nlmsg_report(nlh));
3206         } else {
3207                 /* This basically means we have to flush everything*/
3208                 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3209                                          NETLINK_CB(skb).portid,
3210                                          nlmsg_report(nlh));
3211         }
3212
3213         return 0;
3214 }
3215 static int
3216 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3217                         const struct nlattr * const cda[])
3218 {
3219         if (cda[CTA_EXPECT_TIMEOUT]) {
3220                 if (!del_timer(&x->timeout))
3221                         return -ETIME;
3222
3223                 x->timeout.expires = jiffies +
3224                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3225                 add_timer(&x->timeout);
3226         }
3227         return 0;
3228 }
3229
3230 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3231         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
3232         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
3233 };
3234
3235 static int
3236 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3237                            struct nf_conntrack_expect *exp,
3238                            u_int8_t u3)
3239 {
3240 #if IS_ENABLED(CONFIG_NF_NAT)
3241         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3242         struct nf_conntrack_tuple nat_tuple = {};
3243         int err;
3244
3245         err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3246                                           exp_nat_nla_policy, NULL);
3247         if (err < 0)
3248                 return err;
3249
3250         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3251                 return -EINVAL;
3252
3253         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3254                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3255                                     u3, NULL);
3256         if (err < 0)
3257                 return err;
3258
3259         exp->saved_addr = nat_tuple.src.u3;
3260         exp->saved_proto = nat_tuple.src.u;
3261         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3262
3263         return 0;
3264 #else
3265         return -EOPNOTSUPP;
3266 #endif
3267 }
3268
3269 static struct nf_conntrack_expect *
3270 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3271                        struct nf_conntrack_helper *helper,
3272                        struct nf_conntrack_tuple *tuple,
3273                        struct nf_conntrack_tuple *mask)
3274 {
3275         u_int32_t class = 0;
3276         struct nf_conntrack_expect *exp;
3277         struct nf_conn_help *help;
3278         int err;
3279
3280         help = nfct_help(ct);
3281         if (!help)
3282                 return ERR_PTR(-EOPNOTSUPP);
3283
3284         if (cda[CTA_EXPECT_CLASS] && helper) {
3285                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3286                 if (class > helper->expect_class_max)
3287                         return ERR_PTR(-EINVAL);
3288         }
3289         exp = nf_ct_expect_alloc(ct);
3290         if (!exp)
3291                 return ERR_PTR(-ENOMEM);
3292
3293         if (cda[CTA_EXPECT_FLAGS]) {
3294                 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3295                 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3296         } else {
3297                 exp->flags = 0;
3298         }
3299         if (cda[CTA_EXPECT_FN]) {
3300                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3301                 struct nf_ct_helper_expectfn *expfn;
3302
3303                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3304                 if (expfn == NULL) {
3305                         err = -EINVAL;
3306                         goto err_out;
3307                 }
3308                 exp->expectfn = expfn->expectfn;
3309         } else
3310                 exp->expectfn = NULL;
3311
3312         exp->class = class;
3313         exp->master = ct;
3314         exp->helper = helper;
3315         exp->tuple = *tuple;
3316         exp->mask.src.u3 = mask->src.u3;
3317         exp->mask.src.u.all = mask->src.u.all;
3318
3319         if (cda[CTA_EXPECT_NAT]) {
3320                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3321                                                  exp, nf_ct_l3num(ct));
3322                 if (err < 0)
3323                         goto err_out;
3324         }
3325         return exp;
3326 err_out:
3327         nf_ct_expect_put(exp);
3328         return ERR_PTR(err);
3329 }
3330
3331 static int
3332 ctnetlink_create_expect(struct net *net,
3333                         const struct nf_conntrack_zone *zone,
3334                         const struct nlattr * const cda[],
3335                         u_int8_t u3, u32 portid, int report)
3336 {
3337         struct nf_conntrack_tuple tuple, mask, master_tuple;
3338         struct nf_conntrack_tuple_hash *h = NULL;
3339         struct nf_conntrack_helper *helper = NULL;
3340         struct nf_conntrack_expect *exp;
3341         struct nf_conn *ct;
3342         int err;
3343
3344         /* caller guarantees that those three CTA_EXPECT_* exist */
3345         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3346                                     u3, NULL);
3347         if (err < 0)
3348                 return err;
3349         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3350                                     u3, NULL);
3351         if (err < 0)
3352                 return err;
3353         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3354                                     u3, NULL);
3355         if (err < 0)
3356                 return err;
3357
3358         /* Look for master conntrack of this expectation */
3359         h = nf_conntrack_find_get(net, zone, &master_tuple);
3360         if (!h)
3361                 return -ENOENT;
3362         ct = nf_ct_tuplehash_to_ctrack(h);
3363
3364         rcu_read_lock();
3365         if (cda[CTA_EXPECT_HELP_NAME]) {
3366                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3367
3368                 helper = __nf_conntrack_helper_find(helpname, u3,
3369                                                     nf_ct_protonum(ct));
3370                 if (helper == NULL) {
3371                         rcu_read_unlock();
3372 #ifdef CONFIG_MODULES
3373                         if (request_module("nfct-helper-%s", helpname) < 0) {
3374                                 err = -EOPNOTSUPP;
3375                                 goto err_ct;
3376                         }
3377                         rcu_read_lock();
3378                         helper = __nf_conntrack_helper_find(helpname, u3,
3379                                                             nf_ct_protonum(ct));
3380                         if (helper) {
3381                                 err = -EAGAIN;
3382                                 goto err_rcu;
3383                         }
3384                         rcu_read_unlock();
3385 #endif
3386                         err = -EOPNOTSUPP;
3387                         goto err_ct;
3388                 }
3389         }
3390
3391         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3392         if (IS_ERR(exp)) {
3393                 err = PTR_ERR(exp);
3394                 goto err_rcu;
3395         }
3396
3397         err = nf_ct_expect_related_report(exp, portid, report, 0);
3398         nf_ct_expect_put(exp);
3399 err_rcu:
3400         rcu_read_unlock();
3401 err_ct:
3402         nf_ct_put(ct);
3403         return err;
3404 }
3405
3406 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3407                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3408                                 const struct nlattr * const cda[],
3409                                 struct netlink_ext_ack *extack)
3410 {
3411         struct nf_conntrack_tuple tuple;
3412         struct nf_conntrack_expect *exp;
3413         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3414         u_int8_t u3 = nfmsg->nfgen_family;
3415         struct nf_conntrack_zone zone;
3416         int err;
3417
3418         if (!cda[CTA_EXPECT_TUPLE]
3419             || !cda[CTA_EXPECT_MASK]
3420             || !cda[CTA_EXPECT_MASTER])
3421                 return -EINVAL;
3422
3423         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3424         if (err < 0)
3425                 return err;
3426
3427         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3428                                     u3, NULL);
3429         if (err < 0)
3430                 return err;
3431
3432         spin_lock_bh(&nf_conntrack_expect_lock);
3433         exp = __nf_ct_expect_find(net, &zone, &tuple);
3434         if (!exp) {
3435                 spin_unlock_bh(&nf_conntrack_expect_lock);
3436                 err = -ENOENT;
3437                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3438                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3439                                                       NETLINK_CB(skb).portid,
3440                                                       nlmsg_report(nlh));
3441                 }
3442                 return err;
3443         }
3444
3445         err = -EEXIST;
3446         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3447                 err = ctnetlink_change_expect(exp, cda);
3448         spin_unlock_bh(&nf_conntrack_expect_lock);
3449
3450         return err;
3451 }
3452
3453 static int
3454 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3455                              const struct ip_conntrack_stat *st)
3456 {
3457         struct nlmsghdr *nlh;
3458         struct nfgenmsg *nfmsg;
3459         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3460
3461         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3462                               IPCTNL_MSG_EXP_GET_STATS_CPU);
3463         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3464         if (nlh == NULL)
3465                 goto nlmsg_failure;
3466
3467         nfmsg = nlmsg_data(nlh);
3468         nfmsg->nfgen_family = AF_UNSPEC;
3469         nfmsg->version      = NFNETLINK_V0;
3470         nfmsg->res_id       = htons(cpu);
3471
3472         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3473             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3474             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3475                 goto nla_put_failure;
3476
3477         nlmsg_end(skb, nlh);
3478         return skb->len;
3479
3480 nla_put_failure:
3481 nlmsg_failure:
3482         nlmsg_cancel(skb, nlh);
3483         return -1;
3484 }
3485
3486 static int
3487 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3488 {
3489         int cpu;
3490         struct net *net = sock_net(skb->sk);
3491
3492         if (cb->args[0] == nr_cpu_ids)
3493                 return 0;
3494
3495         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3496                 const struct ip_conntrack_stat *st;
3497
3498                 if (!cpu_possible(cpu))
3499                         continue;
3500
3501                 st = per_cpu_ptr(net->ct.stat, cpu);
3502                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3503                                                  cb->nlh->nlmsg_seq,
3504                                                  cpu, st) < 0)
3505                         break;
3506         }
3507         cb->args[0] = cpu;
3508
3509         return skb->len;
3510 }
3511
3512 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3513                                   struct sk_buff *skb,
3514                                   const struct nlmsghdr *nlh,
3515                                   const struct nlattr * const cda[],
3516                                   struct netlink_ext_ack *extack)
3517 {
3518         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3519                 struct netlink_dump_control c = {
3520                         .dump = ctnetlink_exp_stat_cpu_dump,
3521                 };
3522                 return netlink_dump_start(ctnl, skb, nlh, &c);
3523         }
3524
3525         return 0;
3526 }
3527
3528 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3529 static struct nf_ct_event_notifier ctnl_notifier = {
3530         .fcn = ctnetlink_conntrack_event,
3531 };
3532
3533 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3534         .fcn = ctnetlink_expect_event,
3535 };
3536 #endif
3537
3538 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3539         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3540                                             .attr_count = CTA_MAX,
3541                                             .policy = ct_nla_policy },
3542         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3543                                             .attr_count = CTA_MAX,
3544                                             .policy = ct_nla_policy },
3545         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3546                                             .attr_count = CTA_MAX,
3547                                             .policy = ct_nla_policy },
3548         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3549                                             .attr_count = CTA_MAX,
3550                                             .policy = ct_nla_policy },
3551         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3552         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3553         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3554         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3555 };
3556
3557 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3558         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3559                                             .attr_count = CTA_EXPECT_MAX,
3560                                             .policy = exp_nla_policy },
3561         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3562                                             .attr_count = CTA_EXPECT_MAX,
3563                                             .policy = exp_nla_policy },
3564         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3565                                             .attr_count = CTA_EXPECT_MAX,
3566                                             .policy = exp_nla_policy },
3567         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3568 };
3569
3570 static const struct nfnetlink_subsystem ctnl_subsys = {
3571         .name                           = "conntrack",
3572         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3573         .cb_count                       = IPCTNL_MSG_MAX,
3574         .cb                             = ctnl_cb,
3575 };
3576
3577 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3578         .name                           = "conntrack_expect",
3579         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3580         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3581         .cb                             = ctnl_exp_cb,
3582 };
3583
3584 MODULE_ALIAS("ip_conntrack_netlink");
3585 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3586 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3587
3588 static int __net_init ctnetlink_net_init(struct net *net)
3589 {
3590 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3591         int ret;
3592
3593         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3594         if (ret < 0) {
3595                 pr_err("ctnetlink_init: cannot register notifier.\n");
3596                 goto err_out;
3597         }
3598
3599         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3600         if (ret < 0) {
3601                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3602                 goto err_unreg_notifier;
3603         }
3604 #endif
3605         return 0;
3606
3607 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3608 err_unreg_notifier:
3609         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3610 err_out:
3611         return ret;
3612 #endif
3613 }
3614
3615 static void ctnetlink_net_exit(struct net *net)
3616 {
3617 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3618         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3619         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3620 #endif
3621 }
3622
3623 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3624 {
3625         struct net *net;
3626
3627         list_for_each_entry(net, net_exit_list, exit_list)
3628                 ctnetlink_net_exit(net);
3629 }
3630
3631 static struct pernet_operations ctnetlink_net_ops = {
3632         .init           = ctnetlink_net_init,
3633         .exit_batch     = ctnetlink_net_exit_batch,
3634 };
3635
3636 static int __init ctnetlink_init(void)
3637 {
3638         int ret;
3639
3640         ret = nfnetlink_subsys_register(&ctnl_subsys);
3641         if (ret < 0) {
3642                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3643                 goto err_out;
3644         }
3645
3646         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3647         if (ret < 0) {
3648                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3649                 goto err_unreg_subsys;
3650         }
3651
3652         ret = register_pernet_subsys(&ctnetlink_net_ops);
3653         if (ret < 0) {
3654                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3655                 goto err_unreg_exp_subsys;
3656         }
3657 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3658         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3659         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3660 #endif
3661         return 0;
3662
3663 err_unreg_exp_subsys:
3664         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3665 err_unreg_subsys:
3666         nfnetlink_subsys_unregister(&ctnl_subsys);
3667 err_out:
3668         return ret;
3669 }
3670
3671 static void __exit ctnetlink_exit(void)
3672 {
3673         unregister_pernet_subsys(&ctnetlink_net_ops);
3674         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3675         nfnetlink_subsys_unregister(&ctnl_subsys);
3676 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3677         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3678 #endif
3679         synchronize_rcu();
3680 }
3681
3682 module_init(ctnetlink_init);
3683 module_exit(ctnetlink_exit);