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