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 #include "nf_internals.h"
  58
  59 MODULE_LICENSE("GPL");
  60
  61 static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  62                                 const struct nf_conntrack_tuple *tuple,
  63                                 const struct nf_conntrack_l4proto *l4proto)
  64 {
  65         int ret = 0;
  66         struct nlattr *nest_parms;
  67
  68         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
  69         if (!nest_parms)
  70                 goto nla_put_failure;
  71         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  72                 goto nla_put_failure;
  73
  74         if (likely(l4proto->tuple_to_nlattr))
  75                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  76
  77         nla_nest_end(skb, nest_parms);
  78
  79         return ret;
  80
  81 nla_put_failure:
  82         return -1;
  83 }
  84
  85 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
  86                                 const struct nf_conntrack_tuple *tuple)
  87 {
  88         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
  89             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
  90                 return -EMSGSIZE;
  91         return 0;
  92 }
  93
  94 static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
  95                                 const struct nf_conntrack_tuple *tuple)
  96 {
  97         if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
  98             nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
  99                 return -EMSGSIZE;
 100         return 0;
 101 }
 102
 103 static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
 104                                     const struct nf_conntrack_tuple *tuple)
 105 {
 106         int ret = 0;
 107         struct nlattr *nest_parms;
 108
 109         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
 110         if (!nest_parms)
 111                 goto nla_put_failure;
 112
 113         switch (tuple->src.l3num) {
 114         case NFPROTO_IPV4:
 115                 ret = ipv4_tuple_to_nlattr(skb, tuple);
 116                 break;
 117         case NFPROTO_IPV6:
 118                 ret = ipv6_tuple_to_nlattr(skb, tuple);
 119                 break;
 120         }
 121
 122         nla_nest_end(skb, nest_parms);
 123
 124         return ret;
 125
 126 nla_put_failure:
 127         return -1;
 128 }
 129
 130 static int ctnetlink_dump_tuples(struct sk_buff *skb,
 131                                  const struct nf_conntrack_tuple *tuple)
 132 {
 133         const struct nf_conntrack_l4proto *l4proto;
 134         int ret;
 135
 136         rcu_read_lock();
 137         ret = ctnetlink_dump_tuples_ip(skb, tuple);
 138
 139         if (ret >= 0) {
 140                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
 141                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 142         }
 143         rcu_read_unlock();
 144         return ret;
 145 }
 146
 147 static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
 148                                   const struct nf_conntrack_zone *zone, int dir)
 149 {
 150         if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
 151                 return 0;
 152         if (nla_put_be16(skb, attrtype, htons(zone->id)))
 153                 goto nla_put_failure;
 154         return 0;
 155
 156 nla_put_failure:
 157         return -1;
 158 }
 159
 160 static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 161 {
 162         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 163                 goto nla_put_failure;
 164         return 0;
 165
 166 nla_put_failure:
 167         return -1;
 168 }
 169
 170 static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
 171                                   bool skip_zero)
 172 {
 173         long timeout = nf_ct_expires(ct) / HZ;
 174
 175         if (skip_zero && timeout == 0)
 176                 return 0;
 177
 178         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 179                 goto nla_put_failure;
 180         return 0;
 181
 182 nla_put_failure:
 183         return -1;
 184 }
 185
 186 static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct,
 187                                     bool destroy)
 188 {
 189         const struct nf_conntrack_l4proto *l4proto;
 190         struct nlattr *nest_proto;
 191         int ret;
 192
 193         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
 194         if (!l4proto->to_nlattr)
 195                 return 0;
 196
 197         nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
 198         if (!nest_proto)
 199                 goto nla_put_failure;
 200
 201         ret = l4proto->to_nlattr(skb, nest_proto, ct, destroy);
 202
 203         nla_nest_end(skb, nest_proto);
 204
 205         return ret;
 206
 207 nla_put_failure:
 208         return -1;
 209 }
 210
 211 static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
 212                                    const struct nf_conn *ct)
 213 {
 214         struct nlattr *nest_helper;
 215         const struct nf_conn_help *help = nfct_help(ct);
 216         struct nf_conntrack_helper *helper;
 217
 218         if (!help)
 219                 return 0;
 220
 221         helper = rcu_dereference(help->helper);
 222         if (!helper)
 223                 goto out;
 224
 225         nest_helper = nla_nest_start(skb, CTA_HELP);
 226         if (!nest_helper)
 227                 goto nla_put_failure;
 228         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 229                 goto nla_put_failure;
 230
 231         if (helper->to_nlattr)
 232                 helper->to_nlattr(skb, ct);
 233
 234         nla_nest_end(skb, nest_helper);
 235 out:
 236         return 0;
 237
 238 nla_put_failure:
 239         return -1;
 240 }
 241
 242 static int
 243 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
 244               enum ip_conntrack_dir dir, int type)
 245 {
 246         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 247         struct nf_conn_counter *counter = acct->counter;
 248         struct nlattr *nest_count;
 249         u64 pkts, bytes;
 250
 251         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 252                 pkts = atomic64_xchg(&counter[dir].packets, 0);
 253                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
 254         } else {
 255                 pkts = atomic64_read(&counter[dir].packets);
 256                 bytes = atomic64_read(&counter[dir].bytes);
 257         }
 258
 259         nest_count = nla_nest_start(skb, attr);
 260         if (!nest_count)
 261                 goto nla_put_failure;
 262
 263         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
 264                          CTA_COUNTERS_PAD) ||
 265             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
 266                          CTA_COUNTERS_PAD))
 267                 goto nla_put_failure;
 268
 269         nla_nest_end(skb, nest_count);
 270
 271         return 0;
 272
 273 nla_put_failure:
 274         return -1;
 275 }
 276
 277 static int
 278 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
 279 {
 280         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
 281
 282         if (!acct)
 283                 return 0;
 284
 285         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
 286                 return -1;
 287         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
 288                 return -1;
 289
 290         return 0;
 291 }
 292
 293 static int
 294 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 295 {
 296         struct nlattr *nest_count;
 297         const struct nf_conn_tstamp *tstamp;
 298
 299         tstamp = nf_conn_tstamp_find(ct);
 300         if (!tstamp)
 301                 return 0;
 302
 303         nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
 304         if (!nest_count)
 305                 goto nla_put_failure;
 306
 307         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
 308                          CTA_TIMESTAMP_PAD) ||
 309             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 310                                                cpu_to_be64(tstamp->stop),
 311                                                CTA_TIMESTAMP_PAD)))
 312                 goto nla_put_failure;
 313         nla_nest_end(skb, nest_count);
 314
 315         return 0;
 316
 317 nla_put_failure:
 318         return -1;
 319 }
 320
 321 #ifdef CONFIG_NF_CONNTRACK_MARK
 322 static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 323 {
 324         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 325                 goto nla_put_failure;
 326         return 0;
 327
 328 nla_put_failure:
 329         return -1;
 330 }
 331 #else
 332 #define ctnetlink_dump_mark(a, b) (0)
 333 #endif
 334
 335 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 336 static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 337 {
 338         struct nlattr *nest_secctx;
 339         int len, ret;
 340         char *secctx;
 341
 342         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 343         if (ret)
 344                 return 0;
 345
 346         ret = -1;
 347         nest_secctx = nla_nest_start(skb, CTA_SECCTX);
 348         if (!nest_secctx)
 349                 goto nla_put_failure;
 350
 351         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 352                 goto nla_put_failure;
 353         nla_nest_end(skb, nest_secctx);
 354
 355         ret = 0;
 356 nla_put_failure:
 357         security_release_secctx(secctx, len);
 358         return ret;
 359 }
 360 #else
 361 #define ctnetlink_dump_secctx(a, b) (0)
 362 #endif
 363
 364 #ifdef CONFIG_NF_CONNTRACK_LABELS
 365 static inline int ctnetlink_label_size(const struct nf_conn *ct)
 366 {
 367         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 368
 369         if (!labels)
 370                 return 0;
 371         return nla_total_size(sizeof(labels->bits));
 372 }
 373
 374 static int
 375 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 376 {
 377         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 378         unsigned int i;
 379
 380         if (!labels)
 381                 return 0;
 382
 383         i = 0;
 384         do {
 385                 if (labels->bits[i] != 0)
 386                         return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
 387                                        labels->bits);
 388                 i++;
 389         } while (i < ARRAY_SIZE(labels->bits));
 390
 391         return 0;
 392 }
 393 #else
 394 #define ctnetlink_dump_labels(a, b) (0)
 395 #define ctnetlink_label_size(a) (0)
 396 #endif
 397
 398 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 399
 400 static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 401 {
 402         struct nlattr *nest_parms;
 403
 404         if (!(ct->status & IPS_EXPECTED))
 405                 return 0;
 406
 407         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
 408         if (!nest_parms)
 409                 goto nla_put_failure;
 410         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 411                 goto nla_put_failure;
 412         nla_nest_end(skb, nest_parms);
 413
 414         return 0;
 415
 416 nla_put_failure:
 417         return -1;
 418 }
 419
 420 static int
 421 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
 422 {
 423         struct nlattr *nest_parms;
 424
 425         nest_parms = nla_nest_start(skb, type);
 426         if (!nest_parms)
 427                 goto nla_put_failure;
 428
 429         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
 430                          htonl(seq->correction_pos)) ||
 431             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
 432                          htonl(seq->offset_before)) ||
 433             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
 434                          htonl(seq->offset_after)))
 435                 goto nla_put_failure;
 436
 437         nla_nest_end(skb, nest_parms);
 438
 439         return 0;
 440
 441 nla_put_failure:
 442         return -1;
 443 }
 444
 445 static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
 446 {
 447         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
 448         struct nf_ct_seqadj *seq;
 449
 450         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
 451                 return 0;
 452
 453         spin_lock_bh(&ct->lock);
 454         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
 455         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
 456                 goto err;
 457
 458         seq = &seqadj->seq[IP_CT_DIR_REPLY];
 459         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
 460                 goto err;
 461
 462         spin_unlock_bh(&ct->lock);
 463         return 0;
 464 err:
 465         spin_unlock_bh(&ct->lock);
 466         return -1;
 467 }
 468
 469 static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
 470 {
 471         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
 472         struct nlattr *nest_parms;
 473
 474         if (!synproxy)
 475                 return 0;
 476
 477         nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
 478         if (!nest_parms)
 479                 goto nla_put_failure;
 480
 481         if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
 482             nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
 483             nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
 484                 goto nla_put_failure;
 485
 486         nla_nest_end(skb, nest_parms);
 487
 488         return 0;
 489
 490 nla_put_failure:
 491         return -1;
 492 }
 493
 494 static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 495 {
 496         __be32 id = (__force __be32)nf_ct_get_id(ct);
 497
 498         if (nla_put_be32(skb, CTA_ID, id))
 499                 goto nla_put_failure;
 500         return 0;
 501
 502 nla_put_failure:
 503         return -1;
 504 }
 505
 506 static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 507 {
 508         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 509                 goto nla_put_failure;
 510         return 0;
 511
 512 nla_put_failure:
 513         return -1;
 514 }
 515
 516 /* all these functions access ct->ext. Caller must either hold a reference
 517  * on ct or prevent its deletion by holding either the bucket spinlock or
 518  * pcpu dying list lock.
 519  */
 520 static int ctnetlink_dump_extinfo(struct sk_buff *skb,
 521                                   struct nf_conn *ct, u32 type)
 522 {
 523         if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 524             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 525             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 526             ctnetlink_dump_labels(skb, ct) < 0 ||
 527             ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
 528             ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 529                 return -1;
 530
 531         return 0;
 532 }
 533
 534 static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
 535 {
 536         if (ctnetlink_dump_status(skb, ct) < 0 ||
 537             ctnetlink_dump_mark(skb, ct) < 0 ||
 538             ctnetlink_dump_secctx(skb, ct) < 0 ||
 539             ctnetlink_dump_id(skb, ct) < 0 ||
 540             ctnetlink_dump_use(skb, ct) < 0 ||
 541             ctnetlink_dump_master(skb, ct) < 0)
 542                 return -1;
 543
 544         if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
 545             (ctnetlink_dump_timeout(skb, ct, false) < 0 ||
 546              ctnetlink_dump_protoinfo(skb, ct, false) < 0))
 547                 return -1;
 548
 549         return 0;
 550 }
 551
 552 static int
 553 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 554                     struct nf_conn *ct, bool extinfo, unsigned int flags)
 555 {
 556         const struct nf_conntrack_zone *zone;
 557         struct nlmsghdr *nlh;
 558         struct nfgenmsg *nfmsg;
 559         struct nlattr *nest_parms;
 560         unsigned int event;
 561
 562         if (portid)
 563                 flags |= NLM_F_MULTI;
 564         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
 565         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
 566         if (nlh == NULL)
 567                 goto nlmsg_failure;
 568
 569         nfmsg = nlmsg_data(nlh);
 570         nfmsg->nfgen_family = nf_ct_l3num(ct);
 571         nfmsg->version      = NFNETLINK_V0;
 572         nfmsg->res_id       = 0;
 573
 574         zone = nf_ct_zone(ct);
 575
 576         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
 577         if (!nest_parms)
 578                 goto nla_put_failure;
 579         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 580                 goto nla_put_failure;
 581         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 582                                    NF_CT_ZONE_DIR_ORIG) < 0)
 583                 goto nla_put_failure;
 584         nla_nest_end(skb, nest_parms);
 585
 586         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
 587         if (!nest_parms)
 588                 goto nla_put_failure;
 589         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 590                 goto nla_put_failure;
 591         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 592                                    NF_CT_ZONE_DIR_REPL) < 0)
 593                 goto nla_put_failure;
 594         nla_nest_end(skb, nest_parms);
 595
 596         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 597                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 598                 goto nla_put_failure;
 599
 600         if (ctnetlink_dump_info(skb, ct) < 0)
 601                 goto nla_put_failure;
 602         if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
 603                 goto nla_put_failure;
 604
 605         nlmsg_end(skb, nlh);
 606         return skb->len;
 607
 608 nlmsg_failure:
 609 nla_put_failure:
 610         nlmsg_cancel(skb, nlh);
 611         return -1;
 612 }
 613
 614 static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
 615         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
 616         [CTA_IP_V4_DST] = { .type = NLA_U32 },
 617         [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
 618         [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
 619 };
 620
 621 #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
 622 static size_t ctnetlink_proto_size(const struct nf_conn *ct)
 623 {
 624         const struct nf_conntrack_l4proto *l4proto;
 625         size_t len, len4 = 0;
 626
 627         len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
 628         len *= 3u; /* ORIG, REPLY, MASTER */
 629
 630         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
 631         len += l4proto->nlattr_size;
 632         if (l4proto->nlattr_tuple_size) {
 633                 len4 = l4proto->nlattr_tuple_size();
 634                 len4 *= 3u; /* ORIG, REPLY, MASTER */
 635         }
 636
 637         return len + len4;
 638 }
 639 #endif
 640
 641 static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
 642 {
 643         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 644                 return 0;
 645         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 646                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 647                + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 648                ;
 649 }
 650
 651 static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
 652 {
 653 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 654         int len, ret;
 655
 656         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 657         if (ret)
 658                 return 0;
 659
 660         return nla_total_size(0) /* CTA_SECCTX */
 661                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 662 #else
 663         return 0;
 664 #endif
 665 }
 666
 667 static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
 668 {
 669 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 670         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 671                 return 0;
 672         return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
 673 #else
 674         return 0;
 675 #endif
 676 }
 677
 678 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 679 static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
 680 {
 681         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 682                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 683                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 684                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 685                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 686                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 687                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 688                + ctnetlink_acct_size(ct)
 689                + ctnetlink_timestamp_size(ct)
 690                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 691                + nla_total_size(0) /* CTA_PROTOINFO */
 692                + nla_total_size(0) /* CTA_HELP */
 693                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 694                + ctnetlink_secctx_size(ct)
 695 #if IS_ENABLED(CONFIG_NF_NAT)
 696                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 697                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 698 #endif
 699 #ifdef CONFIG_NF_CONNTRACK_MARK
 700                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 701 #endif
 702 #ifdef CONFIG_NF_CONNTRACK_ZONES
 703                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
 704 #endif
 705                + ctnetlink_proto_size(ct)
 706                + ctnetlink_label_size(ct)
 707                ;
 708 }
 709
 710 static int
 711 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 712 {
 713         const struct nf_conntrack_zone *zone;
 714         struct net *net;
 715         struct nlmsghdr *nlh;
 716         struct nfgenmsg *nfmsg;
 717         struct nlattr *nest_parms;
 718         struct nf_conn *ct = item->ct;
 719         struct sk_buff *skb;
 720         unsigned int type;
 721         unsigned int flags = 0, group;
 722         int err;
 723
 724         if (events & (1 << IPCT_DESTROY)) {
 725                 type = IPCTNL_MSG_CT_DELETE;
 726                 group = NFNLGRP_CONNTRACK_DESTROY;
 727         } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 728                 type = IPCTNL_MSG_CT_NEW;
 729                 flags = NLM_F_CREATE|NLM_F_EXCL;
 730                 group = NFNLGRP_CONNTRACK_NEW;
 731         } else if (events) {
 732                 type = IPCTNL_MSG_CT_NEW;
 733                 group = NFNLGRP_CONNTRACK_UPDATE;
 734         } else
 735                 return 0;
 736
 737         net = nf_ct_net(ct);
 738         if (!item->report && !nfnetlink_has_listeners(net, group))
 739                 return 0;
 740
 741         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 742         if (skb == NULL)
 743                 goto errout;
 744
 745         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
 746         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
 747         if (nlh == NULL)
 748                 goto nlmsg_failure;
 749
 750         nfmsg = nlmsg_data(nlh);
 751         nfmsg->nfgen_family = nf_ct_l3num(ct);
 752         nfmsg->version  = NFNETLINK_V0;
 753         nfmsg->res_id   = 0;
 754
 755         zone = nf_ct_zone(ct);
 756
 757         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
 758         if (!nest_parms)
 759                 goto nla_put_failure;
 760         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 761                 goto nla_put_failure;
 762         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 763                                    NF_CT_ZONE_DIR_ORIG) < 0)
 764                 goto nla_put_failure;
 765         nla_nest_end(skb, nest_parms);
 766
 767         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
 768         if (!nest_parms)
 769                 goto nla_put_failure;
 770         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 771                 goto nla_put_failure;
 772         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
 773                                    NF_CT_ZONE_DIR_REPL) < 0)
 774                 goto nla_put_failure;
 775         nla_nest_end(skb, nest_parms);
 776
 777         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
 778                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
 779                 goto nla_put_failure;
 780
 781         if (ctnetlink_dump_id(skb, ct) < 0)
 782                 goto nla_put_failure;
 783
 784         if (ctnetlink_dump_status(skb, ct) < 0)
 785                 goto nla_put_failure;
 786
 787         if (events & (1 << IPCT_DESTROY)) {
 788                 if (ctnetlink_dump_timeout(skb, ct, true) < 0)
 789                         goto nla_put_failure;
 790
 791                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 792                     ctnetlink_dump_timestamp(skb, ct) < 0 ||
 793                     ctnetlink_dump_protoinfo(skb, ct, true) < 0)
 794                         goto nla_put_failure;
 795         } else {
 796                 if (ctnetlink_dump_timeout(skb, ct, false) < 0)
 797                         goto nla_put_failure;
 798
 799                 if (events & (1 << IPCT_PROTOINFO) &&
 800                     ctnetlink_dump_protoinfo(skb, ct, false) < 0)
 801                         goto nla_put_failure;
 802
 803                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 804                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 805                         goto nla_put_failure;
 806
 807 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 808                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 809                     && ctnetlink_dump_secctx(skb, ct) < 0)
 810                         goto nla_put_failure;
 811 #endif
 812                 if (events & (1 << IPCT_LABEL) &&
 813                      ctnetlink_dump_labels(skb, ct) < 0)
 814                         goto nla_put_failure;
 815
 816                 if (events & (1 << IPCT_RELATED) &&
 817                     ctnetlink_dump_master(skb, ct) < 0)
 818                         goto nla_put_failure;
 819
 820                 if (events & (1 << IPCT_SEQADJ) &&
 821                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 822                         goto nla_put_failure;
 823
 824                 if (events & (1 << IPCT_SYNPROXY) &&
 825                     ctnetlink_dump_ct_synproxy(skb, ct) < 0)
 826                         goto nla_put_failure;
 827         }
 828
 829 #ifdef CONFIG_NF_CONNTRACK_MARK
 830         if ((events & (1 << IPCT_MARK) || ct->mark)
 831             && ctnetlink_dump_mark(skb, ct) < 0)
 832                 goto nla_put_failure;
 833 #endif
 834         nlmsg_end(skb, nlh);
 835         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 836                              GFP_ATOMIC);
 837         if (err == -ENOBUFS || err == -EAGAIN)
 838                 return -ENOBUFS;
 839
 840         return 0;
 841
 842 nla_put_failure:
 843         nlmsg_cancel(skb, nlh);
 844 nlmsg_failure:
 845         kfree_skb(skb);
 846 errout:
 847         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 848                 return -ENOBUFS;
 849
 850         return 0;
 851 }
 852 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 853
 854 static int ctnetlink_done(struct netlink_callback *cb)
 855 {
 856         if (cb->args[1])
 857                 nf_ct_put((struct nf_conn *)cb->args[1]);
 858         kfree(cb->data);
 859         return 0;
 860 }
 861
 862 struct ctnetlink_filter {
 863         u8 family;
 864
 865         u_int32_t orig_flags;
 866         u_int32_t reply_flags;
 867
 868         struct nf_conntrack_tuple orig;
 869         struct nf_conntrack_tuple reply;
 870         struct nf_conntrack_zone zone;
 871
 872         struct {
 873                 u_int32_t val;
 874                 u_int32_t mask;
 875         } mark;
 876 };
 877
 878 static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
 879         [CTA_FILTER_ORIG_FLAGS]         = { .type = NLA_U32 },
 880         [CTA_FILTER_REPLY_FLAGS]        = { .type = NLA_U32 },
 881 };
 882
 883 static int ctnetlink_parse_filter(const struct nlattr *attr,
 884                                   struct ctnetlink_filter *filter)
 885 {
 886         struct nlattr *tb[CTA_FILTER_MAX + 1];
 887         int ret = 0;
 888
 889         ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
 890                                NULL);
 891         if (ret)
 892                 return ret;
 893
 894         if (tb[CTA_FILTER_ORIG_FLAGS]) {
 895                 filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
 896                 if (filter->orig_flags & ~CTA_FILTER_F_ALL)
 897                         return -EOPNOTSUPP;
 898         }
 899
 900         if (tb[CTA_FILTER_REPLY_FLAGS]) {
 901                 filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
 902                 if (filter->reply_flags & ~CTA_FILTER_F_ALL)
 903                         return -EOPNOTSUPP;
 904         }
 905
 906         return 0;
 907 }
 908
 909 static int ctnetlink_parse_zone(const struct nlattr *attr,
 910                                 struct nf_conntrack_zone *zone);
 911 static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
 912                                          struct nf_conntrack_tuple *tuple,
 913                                          u32 type, u_int8_t l3num,
 914                                          struct nf_conntrack_zone *zone,
 915                                          u_int32_t flags);
 916
 917 static struct ctnetlink_filter *
 918 ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
 919 {
 920         struct ctnetlink_filter *filter;
 921         int err;
 922
 923 #ifndef CONFIG_NF_CONNTRACK_MARK
 924         if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
 925                 return ERR_PTR(-EOPNOTSUPP);
 926 #endif
 927
 928         filter = kzalloc(sizeof(*filter), GFP_KERNEL);
 929         if (filter == NULL)
 930                 return ERR_PTR(-ENOMEM);
 931
 932         filter->family = family;
 933
 934 #ifdef CONFIG_NF_CONNTRACK_MARK
 935         if (cda[CTA_MARK]) {
 936                 filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
 937                 if (cda[CTA_MARK_MASK])
 938                         filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
 939                 else
 940                         filter->mark.mask = 0xffffffff;
 941         } else if (cda[CTA_MARK_MASK]) {
 942                 err = -EINVAL;
 943                 goto err_filter;
 944         }
 945 #endif
 946         if (!cda[CTA_FILTER])
 947                 return filter;
 948
 949         err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
 950         if (err < 0)
 951                 goto err_filter;
 952
 953         err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
 954         if (err < 0)
 955                 goto err_filter;
 956
 957         if (filter->orig_flags) {
 958                 if (!cda[CTA_TUPLE_ORIG]) {
 959                         err = -EINVAL;
 960                         goto err_filter;
 961                 }
 962
 963                 err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
 964                                                    CTA_TUPLE_ORIG,
 965                                                    filter->family,
 966                                                    &filter->zone,
 967                                                    filter->orig_flags);
 968                 if (err < 0)
 969                         goto err_filter;
 970         }
 971
 972         if (filter->reply_flags) {
 973                 if (!cda[CTA_TUPLE_REPLY]) {
 974                         err = -EINVAL;
 975                         goto err_filter;
 976                 }
 977
 978                 err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
 979                                                    CTA_TUPLE_REPLY,
 980                                                    filter->family,
 981                                                    &filter->zone,
 982                                                    filter->orig_flags);
 983                 if (err < 0) {
 984                         err = -EINVAL;
 985                         goto err_filter;
 986                 }
 987         }
 988
 989         return filter;
 990
 991 err_filter:
 992         kfree(filter);
 993
 994         return ERR_PTR(err);
 995 }
 996
 997 static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
 998 {
 999         return family || cda[CTA_MARK] || cda[CTA_FILTER];
1000 }
1001
1002 static int ctnetlink_start(struct netlink_callback *cb)
1003 {
1004         const struct nlattr * const *cda = cb->data;
1005         struct ctnetlink_filter *filter = NULL;
1006         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1007         u8 family = nfmsg->nfgen_family;
1008
1009         if (ctnetlink_needs_filter(family, cda)) {
1010                 filter = ctnetlink_alloc_filter(cda, family);
1011                 if (IS_ERR(filter))
1012                         return PTR_ERR(filter);
1013         }
1014
1015         cb->data = filter;
1016         return 0;
1017 }
1018
1019 static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
1020                                         struct nf_conntrack_tuple *ct_tuple,
1021                                         u_int32_t flags, int family)
1022 {
1023         switch (family) {
1024         case NFPROTO_IPV4:
1025                 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1026                     filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
1027                         return  0;
1028
1029                 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1030                     filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
1031                         return  0;
1032                 break;
1033         case NFPROTO_IPV6:
1034                 if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
1035                     !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
1036                                    &ct_tuple->src.u3.in6))
1037                         return 0;
1038
1039                 if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
1040                     !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
1041                                    &ct_tuple->dst.u3.in6))
1042                         return 0;
1043                 break;
1044         }
1045
1046         if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
1047             filter_tuple->dst.protonum != ct_tuple->dst.protonum)
1048                 return 0;
1049
1050         switch (ct_tuple->dst.protonum) {
1051         case IPPROTO_TCP:
1052         case IPPROTO_UDP:
1053                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
1054                     filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
1055                         return 0;
1056
1057                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
1058                     filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
1059                         return 0;
1060                 break;
1061         case IPPROTO_ICMP:
1062                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
1063                     filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1064                         return 0;
1065                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
1066                     filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1067                         return 0;
1068                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
1069                     filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1070                         return 0;
1071                 break;
1072         case IPPROTO_ICMPV6:
1073                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
1074                     filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
1075                         return 0;
1076                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
1077                     filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
1078                         return 0;
1079                 if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
1080                     filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
1081                         return 0;
1082                 break;
1083         }
1084
1085         return 1;
1086 }
1087
1088 static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
1089 {
1090         struct ctnetlink_filter *filter = data;
1091         struct nf_conntrack_tuple *tuple;
1092
1093         if (filter == NULL)
1094                 goto out;
1095
1096         /* Match entries of a given L3 protocol number.
1097          * If it is not specified, ie. l3proto == 0,
1098          * then match everything.
1099          */
1100         if (filter->family && nf_ct_l3num(ct) != filter->family)
1101                 goto ignore_entry;
1102
1103         if (filter->orig_flags) {
1104                 tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
1105                 if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
1106                                                   filter->orig_flags,
1107                                                   filter->family))
1108                         goto ignore_entry;
1109         }
1110
1111         if (filter->reply_flags) {
1112                 tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
1113                 if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
1114                                                   filter->reply_flags,
1115                                                   filter->family))
1116                         goto ignore_entry;
1117         }
1118
1119 #ifdef CONFIG_NF_CONNTRACK_MARK
1120         if ((ct->mark & filter->mark.mask) != filter->mark.val)
1121                 goto ignore_entry;
1122 #endif
1123
1124 out:
1125         return 1;
1126
1127 ignore_entry:
1128         return 0;
1129 }
1130
1131 static int
1132 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1133 {
1134         unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
1135         struct net *net = sock_net(skb->sk);
1136         struct nf_conn *ct, *last;
1137         struct nf_conntrack_tuple_hash *h;
1138         struct hlist_nulls_node *n;
1139         struct nf_conn *nf_ct_evict[8];
1140         int res, i;
1141         spinlock_t *lockp;
1142
1143         last = (struct nf_conn *)cb->args[1];
1144         i = 0;
1145
1146         local_bh_disable();
1147         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
1148 restart:
1149                 while (i) {
1150                         i--;
1151                         if (nf_ct_should_gc(nf_ct_evict[i]))
1152                                 nf_ct_kill(nf_ct_evict[i]);
1153                         nf_ct_put(nf_ct_evict[i]);
1154                 }
1155
1156                 lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
1157                 nf_conntrack_lock(lockp);
1158                 if (cb->args[0] >= nf_conntrack_htable_size) {
1159                         spin_unlock(lockp);
1160                         goto out;
1161                 }
1162                 hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
1163                                            hnnode) {
1164                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
1165                                 continue;
1166                         ct = nf_ct_tuplehash_to_ctrack(h);
1167                         if (nf_ct_is_expired(ct)) {
1168                                 if (i < ARRAY_SIZE(nf_ct_evict) &&
1169                                     atomic_inc_not_zero(&ct->ct_general.use))
1170                                         nf_ct_evict[i++] = ct;
1171                                 continue;
1172                         }
1173
1174                         if (!net_eq(net, nf_ct_net(ct)))
1175                                 continue;
1176
1177                         if (cb->args[1]) {
1178                                 if (ct != last)
1179                                         continue;
1180                                 cb->args[1] = 0;
1181                         }
1182                         if (!ctnetlink_filter_match(ct, cb->data))
1183                                 continue;
1184
1185                         res =
1186                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1187                                             cb->nlh->nlmsg_seq,
1188                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1189                                             ct, true, flags);
1190                         if (res < 0) {
1191                                 nf_conntrack_get(&ct->ct_general);
1192                                 cb->args[1] = (unsigned long)ct;
1193                                 spin_unlock(lockp);
1194                                 goto out;
1195                         }
1196                 }
1197                 spin_unlock(lockp);
1198                 if (cb->args[1]) {
1199                         cb->args[1] = 0;
1200                         goto restart;
1201                 }
1202         }
1203 out:
1204         local_bh_enable();
1205         if (last) {
1206                 /* nf ct hash resize happened, now clear the leftover. */
1207                 if ((struct nf_conn *)cb->args[1] == last)
1208                         cb->args[1] = 0;
1209
1210                 nf_ct_put(last);
1211         }
1212
1213         while (i) {
1214                 i--;
1215                 if (nf_ct_should_gc(nf_ct_evict[i]))
1216                         nf_ct_kill(nf_ct_evict[i]);
1217                 nf_ct_put(nf_ct_evict[i]);
1218         }
1219
1220         return skb->len;
1221 }
1222
1223 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
1224                                 struct nf_conntrack_tuple *t,
1225                                 u_int32_t flags)
1226 {
1227         if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1228                 if (!tb[CTA_IP_V4_SRC])
1229                         return -EINVAL;
1230
1231                 t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
1232         }
1233
1234         if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1235                 if (!tb[CTA_IP_V4_DST])
1236                         return -EINVAL;
1237
1238                 t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
1239         }
1240
1241         return 0;
1242 }
1243
1244 static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
1245                                 struct nf_conntrack_tuple *t,
1246                                 u_int32_t flags)
1247 {
1248         if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1249                 if (!tb[CTA_IP_V6_SRC])
1250                         return -EINVAL;
1251
1252                 t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
1253         }
1254
1255         if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
1256                 if (!tb[CTA_IP_V6_DST])
1257                         return -EINVAL;
1258
1259                 t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
1260         }
1261
1262         return 0;
1263 }
1264
1265 static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
1266                                     struct nf_conntrack_tuple *tuple,
1267                                     u_int32_t flags)
1268 {
1269         struct nlattr *tb[CTA_IP_MAX+1];
1270         int ret = 0;
1271
1272         ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
1273         if (ret < 0)
1274                 return ret;
1275
1276         ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
1277                                              cta_ip_nla_policy, NULL);
1278         if (ret)
1279                 return ret;
1280
1281         switch (tuple->src.l3num) {
1282         case NFPROTO_IPV4:
1283                 ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
1284                 break;
1285         case NFPROTO_IPV6:
1286                 ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
1287                 break;
1288         }
1289
1290         return ret;
1291 }
1292
1293 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
1294         [CTA_PROTO_NUM] = { .type = NLA_U8 },
1295 };
1296
1297 static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
1298                                        struct nf_conntrack_tuple *tuple,
1299                                        u_int32_t flags)
1300 {
1301         const struct nf_conntrack_l4proto *l4proto;
1302         struct nlattr *tb[CTA_PROTO_MAX+1];
1303         int ret = 0;
1304
1305         ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
1306                                           proto_nla_policy, NULL);
1307         if (ret < 0)
1308                 return ret;
1309
1310         if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
1311                 return 0;
1312
1313         if (!tb[CTA_PROTO_NUM])
1314                 return -EINVAL;
1315
1316         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
1317
1318         rcu_read_lock();
1319         l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
1320
1321         if (likely(l4proto->nlattr_to_tuple)) {
1322                 ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
1323                                                      l4proto->nla_policy,
1324                                                      NULL);
1325                 if (ret == 0)
1326                         ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
1327         }
1328
1329         rcu_read_unlock();
1330
1331         return ret;
1332 }
1333
1334 static int
1335 ctnetlink_parse_zone(const struct nlattr *attr,
1336                      struct nf_conntrack_zone *zone)
1337 {
1338         nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
1339                         NF_CT_DEFAULT_ZONE_DIR, 0);
1340 #ifdef CONFIG_NF_CONNTRACK_ZONES
1341         if (attr)
1342                 zone->id = ntohs(nla_get_be16(attr));
1343 #else
1344         if (attr)
1345                 return -EOPNOTSUPP;
1346 #endif
1347         return 0;
1348 }
1349
1350 static int
1351 ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
1352                            struct nf_conntrack_zone *zone)
1353 {
1354         int ret;
1355
1356         if (zone->id != NF_CT_DEFAULT_ZONE_ID)
1357                 return -EINVAL;
1358
1359         ret = ctnetlink_parse_zone(attr, zone);
1360         if (ret < 0)
1361                 return ret;
1362
1363         if (type == CTA_TUPLE_REPLY)
1364                 zone->dir = NF_CT_ZONE_DIR_REPL;
1365         else
1366                 zone->dir = NF_CT_ZONE_DIR_ORIG;
1367
1368         return 0;
1369 }
1370
1371 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
1372         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
1373         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
1374         [CTA_TUPLE_ZONE]        = { .type = NLA_U16 },
1375 };
1376
1377 #define CTA_FILTER_F_ALL_CTA_PROTO \
1378   (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
1379    CTA_FILTER_F_CTA_PROTO_DST_PORT | \
1380    CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
1381    CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
1382    CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
1383    CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
1384    CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
1385    CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
1386
1387 static int
1388 ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
1389                               struct nf_conntrack_tuple *tuple, u32 type,
1390                               u_int8_t l3num, struct nf_conntrack_zone *zone,
1391                               u_int32_t flags)
1392 {
1393         struct nlattr *tb[CTA_TUPLE_MAX+1];
1394         int err;
1395
1396         memset(tuple, 0, sizeof(*tuple));
1397
1398         err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
1399                                           tuple_nla_policy, NULL);
1400         if (err < 0)
1401                 return err;
1402
1403         if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
1404                 return -EOPNOTSUPP;
1405         tuple->src.l3num = l3num;
1406
1407         if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
1408             flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
1409                 if (!tb[CTA_TUPLE_IP])
1410                         return -EINVAL;
1411
1412                 err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
1413                 if (err < 0)
1414                         return err;
1415         }
1416
1417         if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
1418                 if (!tb[CTA_TUPLE_PROTO])
1419                         return -EINVAL;
1420
1421                 err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
1422                 if (err < 0)
1423                         return err;
1424         } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
1425                 /* Can't manage proto flags without a protonum  */
1426                 return -EINVAL;
1427         }
1428
1429         if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
1430                 if (!zone)
1431                         return -EINVAL;
1432
1433                 err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
1434                                                  type, zone);
1435                 if (err < 0)
1436                         return err;
1437         }
1438
1439         /* orig and expect tuples get DIR_ORIGINAL */
1440         if (type == CTA_TUPLE_REPLY)
1441                 tuple->dst.dir = IP_CT_DIR_REPLY;
1442         else
1443                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
1444
1445         return 0;
1446 }
1447
1448 static int
1449 ctnetlink_parse_tuple(const struct nlattr * const cda[],
1450                       struct nf_conntrack_tuple *tuple, u32 type,
1451                       u_int8_t l3num, struct nf_conntrack_zone *zone)
1452 {
1453         return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
1454                                             CTA_FILTER_FLAG(ALL));
1455 }
1456
1457 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
1458         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
1459                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1460 };
1461
1462 static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
1463                                 struct nlattr **helpinfo)
1464 {
1465         int err;
1466         struct nlattr *tb[CTA_HELP_MAX+1];
1467
1468         err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
1469                                           help_nla_policy, NULL);
1470         if (err < 0)
1471                 return err;
1472
1473         if (!tb[CTA_HELP_NAME])
1474                 return -EINVAL;
1475
1476         *helper_name = nla_data(tb[CTA_HELP_NAME]);
1477
1478         if (tb[CTA_HELP_INFO])
1479                 *helpinfo = tb[CTA_HELP_INFO];
1480
1481         return 0;
1482 }
1483
1484 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
1485         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
1486         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
1487         [CTA_STATUS]            = { .type = NLA_U32 },
1488         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
1489         [CTA_HELP]              = { .type = NLA_NESTED },
1490         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
1491         [CTA_TIMEOUT]           = { .type = NLA_U32 },
1492         [CTA_MARK]              = { .type = NLA_U32 },
1493         [CTA_ID]                = { .type = NLA_U32 },
1494         [CTA_NAT_DST]           = { .type = NLA_NESTED },
1495         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
1496         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
1497         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
1498         [CTA_ZONE]              = { .type = NLA_U16 },
1499         [CTA_MARK_MASK]         = { .type = NLA_U32 },
1500         [CTA_LABELS]            = { .type = NLA_BINARY,
1501                                     .len = NF_CT_LABELS_MAX_SIZE },
1502         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
1503                                     .len = NF_CT_LABELS_MAX_SIZE },
1504         [CTA_FILTER]            = { .type = NLA_NESTED },
1505 };
1506
1507 static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
1508 {
1509         if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
1510                 return 0;
1511
1512         return ctnetlink_filter_match(ct, data);
1513 }
1514
1515 static int ctnetlink_flush_conntrack(struct net *net,
1516                                      const struct nlattr * const cda[],
1517                                      u32 portid, int report, u8 family)
1518 {
1519         struct ctnetlink_filter *filter = NULL;
1520
1521         if (ctnetlink_needs_filter(family, cda)) {
1522                 if (cda[CTA_FILTER])
1523                         return -EOPNOTSUPP;
1524
1525                 filter = ctnetlink_alloc_filter(cda, family);
1526                 if (IS_ERR(filter))
1527                         return PTR_ERR(filter);
1528         }
1529
1530         nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
1531                                   portid, report);
1532         kfree(filter);
1533
1534         return 0;
1535 }
1536
1537 static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
1538                                    struct sk_buff *skb,
1539                                    const struct nlmsghdr *nlh,
1540                                    const struct nlattr * const cda[],
1541                                    struct netlink_ext_ack *extack)
1542 {
1543         struct nf_conntrack_tuple_hash *h;
1544         struct nf_conntrack_tuple tuple;
1545         struct nf_conn *ct;
1546         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1547         struct nf_conntrack_zone zone;
1548         int err;
1549
1550         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1551         if (err < 0)
1552                 return err;
1553
1554         if (cda[CTA_TUPLE_ORIG])
1555                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1556                                             nfmsg->nfgen_family, &zone);
1557         else if (cda[CTA_TUPLE_REPLY])
1558                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1559                                             nfmsg->nfgen_family, &zone);
1560         else {
1561                 u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
1562
1563                 return ctnetlink_flush_conntrack(net, cda,
1564                                                  NETLINK_CB(skb).portid,
1565                                                  nlmsg_report(nlh), u3);
1566         }
1567
1568         if (err < 0)
1569                 return err;
1570
1571         h = nf_conntrack_find_get(net, &zone, &tuple);
1572         if (!h)
1573                 return -ENOENT;
1574
1575         ct = nf_ct_tuplehash_to_ctrack(h);
1576
1577         if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
1578                 nf_ct_put(ct);
1579                 return -EBUSY;
1580         }
1581
1582         if (cda[CTA_ID]) {
1583                 __be32 id = nla_get_be32(cda[CTA_ID]);
1584
1585                 if (id != (__force __be32)nf_ct_get_id(ct)) {
1586                         nf_ct_put(ct);
1587                         return -ENOENT;
1588                 }
1589         }
1590
1591         nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1592         nf_ct_put(ct);
1593
1594         return 0;
1595 }
1596
1597 static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
1598                                    struct sk_buff *skb,
1599                                    const struct nlmsghdr *nlh,
1600                                    const struct nlattr * const cda[],
1601                                    struct netlink_ext_ack *extack)
1602 {
1603         struct nf_conntrack_tuple_hash *h;
1604         struct nf_conntrack_tuple tuple;
1605         struct nf_conn *ct;
1606         struct sk_buff *skb2 = NULL;
1607         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1608         u_int8_t u3 = nfmsg->nfgen_family;
1609         struct nf_conntrack_zone zone;
1610         int err;
1611
1612         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1613                 struct netlink_dump_control c = {
1614                         .start = ctnetlink_start,
1615                         .dump = ctnetlink_dump_table,
1616                         .done = ctnetlink_done,
1617                         .data = (void *)cda,
1618                 };
1619
1620                 return netlink_dump_start(ctnl, skb, nlh, &c);
1621         }
1622
1623         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1624         if (err < 0)
1625                 return err;
1626
1627         if (cda[CTA_TUPLE_ORIG])
1628                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
1629                                             u3, &zone);
1630         else if (cda[CTA_TUPLE_REPLY])
1631                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
1632                                             u3, &zone);
1633         else
1634                 return -EINVAL;
1635
1636         if (err < 0)
1637                 return err;
1638
1639         h = nf_conntrack_find_get(net, &zone, &tuple);
1640         if (!h)
1641                 return -ENOENT;
1642
1643         ct = nf_ct_tuplehash_to_ctrack(h);
1644
1645         err = -ENOMEM;
1646         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1647         if (skb2 == NULL) {
1648                 nf_ct_put(ct);
1649                 return -ENOMEM;
1650         }
1651
1652         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1653                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
1654         nf_ct_put(ct);
1655         if (err <= 0)
1656                 goto free;
1657
1658         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1659         if (err < 0)
1660                 goto out;
1661
1662         return 0;
1663
1664 free:
1665         kfree_skb(skb2);
1666 out:
1667         /* this avoids a loop in nfnetlink. */
1668         return err == -EAGAIN ? -ENOBUFS : err;
1669 }
1670
1671 static int ctnetlink_done_list(struct netlink_callback *cb)
1672 {
1673         if (cb->args[1])
1674                 nf_ct_put((struct nf_conn *)cb->args[1]);
1675         return 0;
1676 }
1677
1678 static int
1679 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
1680 {
1681         struct nf_conn *ct, *last;
1682         struct nf_conntrack_tuple_hash *h;
1683         struct hlist_nulls_node *n;
1684         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1685         u_int8_t l3proto = nfmsg->nfgen_family;
1686         int res;
1687         int cpu;
1688         struct hlist_nulls_head *list;
1689         struct net *net = sock_net(skb->sk);
1690
1691         if (cb->args[2])
1692                 return 0;
1693
1694         last = (struct nf_conn *)cb->args[1];
1695
1696         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1697                 struct ct_pcpu *pcpu;
1698
1699                 if (!cpu_possible(cpu))
1700                         continue;
1701
1702                 pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
1703                 spin_lock_bh(&pcpu->lock);
1704                 list = dying ? &pcpu->dying : &pcpu->unconfirmed;
1705 restart:
1706                 hlist_nulls_for_each_entry(h, n, list, hnnode) {
1707                         ct = nf_ct_tuplehash_to_ctrack(h);
1708                         if (l3proto && nf_ct_l3num(ct) != l3proto)
1709                                 continue;
1710                         if (cb->args[1]) {
1711                                 if (ct != last)
1712                                         continue;
1713                                 cb->args[1] = 0;
1714                         }
1715
1716                         /* We can't dump extension info for the unconfirmed
1717                          * list because unconfirmed conntracks can have
1718                          * ct->ext reallocated (and thus freed).
1719                          *
1720                          * In the dying list case ct->ext can't be free'd
1721                          * until after we drop pcpu->lock.
1722                          */
1723                         res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1724                                                   cb->nlh->nlmsg_seq,
1725                                                   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1726                                                   ct, dying ? true : false, 0);
1727                         if (res < 0) {
1728                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
1729                                         continue;
1730                                 cb->args[0] = cpu;
1731                                 cb->args[1] = (unsigned long)ct;
1732                                 spin_unlock_bh(&pcpu->lock);
1733                                 goto out;
1734                         }
1735                 }
1736                 if (cb->args[1]) {
1737                         cb->args[1] = 0;
1738                         goto restart;
1739                 }
1740                 spin_unlock_bh(&pcpu->lock);
1741         }
1742         cb->args[2] = 1;
1743 out:
1744         if (last)
1745                 nf_ct_put(last);
1746
1747         return skb->len;
1748 }
1749
1750 static int
1751 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1752 {
1753         return ctnetlink_dump_list(skb, cb, true);
1754 }
1755
1756 static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
1757                                   struct sk_buff *skb,
1758                                   const struct nlmsghdr *nlh,
1759                                   const struct nlattr * const cda[],
1760                                   struct netlink_ext_ack *extack)
1761 {
1762         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1763                 struct netlink_dump_control c = {
1764                         .dump = ctnetlink_dump_dying,
1765                         .done = ctnetlink_done_list,
1766                 };
1767                 return netlink_dump_start(ctnl, skb, nlh, &c);
1768         }
1769
1770         return -EOPNOTSUPP;
1771 }
1772
1773 static int
1774 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1775 {
1776         return ctnetlink_dump_list(skb, cb, false);
1777 }
1778
1779 static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
1780                                         struct sk_buff *skb,
1781                                         const struct nlmsghdr *nlh,
1782                                         const struct nlattr * const cda[],
1783                                         struct netlink_ext_ack *extack)
1784 {
1785         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1786                 struct netlink_dump_control c = {
1787                         .dump = ctnetlink_dump_unconfirmed,
1788                         .done = ctnetlink_done_list,
1789                 };
1790                 return netlink_dump_start(ctnl, skb, nlh, &c);
1791         }
1792
1793         return -EOPNOTSUPP;
1794 }
1795
1796 #if IS_ENABLED(CONFIG_NF_NAT)
1797 static int
1798 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1799                           enum nf_nat_manip_type manip,
1800                           const struct nlattr *attr)
1801         __must_hold(RCU)
1802 {
1803         struct nf_nat_hook *nat_hook;
1804         int err;
1805
1806         nat_hook = rcu_dereference(nf_nat_hook);
1807         if (!nat_hook) {
1808 #ifdef CONFIG_MODULES
1809                 rcu_read_unlock();
1810                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1811                 if (request_module("nf-nat") < 0) {
1812                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1813                         rcu_read_lock();
1814                         return -EOPNOTSUPP;
1815                 }
1816                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1817                 rcu_read_lock();
1818                 nat_hook = rcu_dereference(nf_nat_hook);
1819                 if (nat_hook)
1820                         return -EAGAIN;
1821 #endif
1822                 return -EOPNOTSUPP;
1823         }
1824
1825         err = nat_hook->parse_nat_setup(ct, manip, attr);
1826         if (err == -EAGAIN) {
1827 #ifdef CONFIG_MODULES
1828                 rcu_read_unlock();
1829                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1830                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1831                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1832                         rcu_read_lock();
1833                         return -EOPNOTSUPP;
1834                 }
1835                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1836                 rcu_read_lock();
1837 #else
1838                 err = -EOPNOTSUPP;
1839 #endif
1840         }
1841         return err;
1842 }
1843 #endif
1844
1845 static void
1846 __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
1847                           unsigned long off)
1848 {
1849         unsigned int bit;
1850
1851         /* Ignore these unchangable bits */
1852         on &= ~IPS_UNCHANGEABLE_MASK;
1853         off &= ~IPS_UNCHANGEABLE_MASK;
1854
1855         for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
1856                 if (on & (1 << bit))
1857                         set_bit(bit, &ct->status);
1858                 else if (off & (1 << bit))
1859                         clear_bit(bit, &ct->status);
1860         }
1861 }
1862
1863 static int
1864 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1865 {
1866         unsigned long d;
1867         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1868         d = ct->status ^ status;
1869
1870         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1871                 /* unchangeable */
1872                 return -EBUSY;
1873
1874         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1875                 /* SEEN_REPLY bit can only be set */
1876                 return -EBUSY;
1877
1878         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1879                 /* ASSURED bit can only be set */
1880                 return -EBUSY;
1881
1882         __ctnetlink_change_status(ct, status, 0);
1883         return 0;
1884 }
1885
1886 static int
1887 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1888 {
1889 #if IS_ENABLED(CONFIG_NF_NAT)
1890         int ret;
1891
1892         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1893                 return 0;
1894
1895         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1896                                         cda[CTA_NAT_DST]);
1897         if (ret < 0)
1898                 return ret;
1899
1900         return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1901                                          cda[CTA_NAT_SRC]);
1902 #else
1903         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1904                 return 0;
1905         return -EOPNOTSUPP;
1906 #endif
1907 }
1908
1909 static int ctnetlink_change_helper(struct nf_conn *ct,
1910                                    const struct nlattr * const cda[])
1911 {
1912         struct nf_conntrack_helper *helper;
1913         struct nf_conn_help *help = nfct_help(ct);
1914         char *helpname = NULL;
1915         struct nlattr *helpinfo = NULL;
1916         int err;
1917
1918         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1919         if (err < 0)
1920                 return err;
1921
1922         /* don't change helper of sibling connections */
1923         if (ct->master) {
1924                 /* If we try to change the helper to the same thing twice,
1925                  * treat the second attempt as a no-op instead of returning
1926                  * an error.
1927                  */
1928                 err = -EBUSY;
1929                 if (help) {
1930                         rcu_read_lock();
1931                         helper = rcu_dereference(help->helper);
1932                         if (helper && !strcmp(helper->name, helpname))
1933                                 err = 0;
1934                         rcu_read_unlock();
1935                 }
1936
1937                 return err;
1938         }
1939
1940         if (!strcmp(helpname, "")) {
1941                 if (help && help->helper) {
1942                         /* we had a helper before ... */
1943                         nf_ct_remove_expectations(ct);
1944                         RCU_INIT_POINTER(help->helper, NULL);
1945                 }
1946
1947                 return 0;
1948         }
1949
1950         rcu_read_lock();
1951         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1952                                             nf_ct_protonum(ct));
1953         if (helper == NULL) {
1954                 rcu_read_unlock();
1955                 return -EOPNOTSUPP;
1956         }
1957
1958         if (help) {
1959                 if (help->helper == helper) {
1960                         /* update private helper data if allowed. */
1961                         if (helper->from_nlattr)
1962                                 helper->from_nlattr(helpinfo, ct);
1963                         err = 0;
1964                 } else
1965                         err = -EBUSY;
1966         } else {
1967                 /* we cannot set a helper for an existing conntrack */
1968                 err = -EOPNOTSUPP;
1969         }
1970
1971         rcu_read_unlock();
1972         return err;
1973 }
1974
1975 static int ctnetlink_change_timeout(struct nf_conn *ct,
1976                                     const struct nlattr * const cda[])
1977 {
1978         u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
1979
1980         if (timeout > INT_MAX)
1981                 timeout = INT_MAX;
1982         ct->timeout = nfct_time_stamp + (u32)timeout;
1983
1984         if (test_bit(IPS_DYING_BIT, &ct->status))
1985                 return -ETIME;
1986
1987         return 0;
1988 }
1989
1990 #if defined(CONFIG_NF_CONNTRACK_MARK)
1991 static void ctnetlink_change_mark(struct nf_conn *ct,
1992                                     const struct nlattr * const cda[])
1993 {
1994         u32 mark, newmark, mask = 0;
1995
1996         if (cda[CTA_MARK_MASK])
1997                 mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1998
1999         mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2000         newmark = (ct->mark & mask) ^ mark;
2001         if (newmark != ct->mark)
2002                 ct->mark = newmark;
2003 }
2004 #endif
2005
2006 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
2007         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
2008         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
2009         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
2010 };
2011
2012 static int ctnetlink_change_protoinfo(struct nf_conn *ct,
2013                                       const struct nlattr * const cda[])
2014 {
2015         const struct nlattr *attr = cda[CTA_PROTOINFO];
2016         const struct nf_conntrack_l4proto *l4proto;
2017         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
2018         int err = 0;
2019
2020         err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
2021                                           protoinfo_policy, NULL);
2022         if (err < 0)
2023                 return err;
2024
2025         l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
2026         if (l4proto->from_nlattr)
2027                 err = l4proto->from_nlattr(tb, ct);
2028
2029         return err;
2030 }
2031
2032 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
2033         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
2034         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
2035         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
2036 };
2037
2038 static int change_seq_adj(struct nf_ct_seqadj *seq,
2039                           const struct nlattr * const attr)
2040 {
2041         int err;
2042         struct nlattr *cda[CTA_SEQADJ_MAX+1];
2043
2044         err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
2045                                           seqadj_policy, NULL);
2046         if (err < 0)
2047                 return err;
2048
2049         if (!cda[CTA_SEQADJ_CORRECTION_POS])
2050                 return -EINVAL;
2051
2052         seq->correction_pos =
2053                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
2054
2055         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
2056                 return -EINVAL;
2057
2058         seq->offset_before =
2059                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
2060
2061         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
2062                 return -EINVAL;
2063
2064         seq->offset_after =
2065                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
2066
2067         return 0;
2068 }
2069
2070 static int
2071 ctnetlink_change_seq_adj(struct nf_conn *ct,
2072                          const struct nlattr * const cda[])
2073 {
2074         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
2075         int ret = 0;
2076
2077         if (!seqadj)
2078                 return 0;
2079
2080         spin_lock_bh(&ct->lock);
2081         if (cda[CTA_SEQ_ADJ_ORIG]) {
2082                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
2083                                      cda[CTA_SEQ_ADJ_ORIG]);
2084                 if (ret < 0)
2085                         goto err;
2086
2087                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2088         }
2089
2090         if (cda[CTA_SEQ_ADJ_REPLY]) {
2091                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
2092                                      cda[CTA_SEQ_ADJ_REPLY]);
2093                 if (ret < 0)
2094                         goto err;
2095
2096                 set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
2097         }
2098
2099         spin_unlock_bh(&ct->lock);
2100         return 0;
2101 err:
2102         spin_unlock_bh(&ct->lock);
2103         return ret;
2104 }
2105
2106 static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
2107         [CTA_SYNPROXY_ISN]      = { .type = NLA_U32 },
2108         [CTA_SYNPROXY_ITS]      = { .type = NLA_U32 },
2109         [CTA_SYNPROXY_TSOFF]    = { .type = NLA_U32 },
2110 };
2111
2112 static int ctnetlink_change_synproxy(struct nf_conn *ct,
2113                                      const struct nlattr * const cda[])
2114 {
2115         struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
2116         struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
2117         int err;
2118
2119         if (!synproxy)
2120                 return 0;
2121
2122         err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
2123                                           cda[CTA_SYNPROXY], synproxy_policy,
2124                                           NULL);
2125         if (err < 0)
2126                 return err;
2127
2128         if (!tb[CTA_SYNPROXY_ISN] ||
2129             !tb[CTA_SYNPROXY_ITS] ||
2130             !tb[CTA_SYNPROXY_TSOFF])
2131                 return -EINVAL;
2132
2133         synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
2134         synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
2135         synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
2136
2137         return 0;
2138 }
2139
2140 static int
2141 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
2142 {
2143 #ifdef CONFIG_NF_CONNTRACK_LABELS
2144         size_t len = nla_len(cda[CTA_LABELS]);
2145         const void *mask = cda[CTA_LABELS_MASK];
2146
2147         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
2148                 return -EINVAL;
2149
2150         if (mask) {
2151                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
2152                     nla_len(cda[CTA_LABELS_MASK]) != len)
2153                         return -EINVAL;
2154                 mask = nla_data(cda[CTA_LABELS_MASK]);
2155         }
2156
2157         len /= sizeof(u32);
2158
2159         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
2160 #else
2161         return -EOPNOTSUPP;
2162 #endif
2163 }
2164
2165 static int
2166 ctnetlink_change_conntrack(struct nf_conn *ct,
2167                            const struct nlattr * const cda[])
2168 {
2169         int err;
2170
2171         /* only allow NAT changes and master assignation for new conntracks */
2172         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
2173                 return -EOPNOTSUPP;
2174
2175         if (cda[CTA_HELP]) {
2176                 err = ctnetlink_change_helper(ct, cda);
2177                 if (err < 0)
2178                         return err;
2179         }
2180
2181         if (cda[CTA_TIMEOUT]) {
2182                 err = ctnetlink_change_timeout(ct, cda);
2183                 if (err < 0)
2184                         return err;
2185         }
2186
2187         if (cda[CTA_STATUS]) {
2188                 err = ctnetlink_change_status(ct, cda);
2189                 if (err < 0)
2190                         return err;
2191         }
2192
2193         if (cda[CTA_PROTOINFO]) {
2194                 err = ctnetlink_change_protoinfo(ct, cda);
2195                 if (err < 0)
2196                         return err;
2197         }
2198
2199 #if defined(CONFIG_NF_CONNTRACK_MARK)
2200         if (cda[CTA_MARK])
2201                 ctnetlink_change_mark(ct, cda);
2202 #endif
2203
2204         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2205                 err = ctnetlink_change_seq_adj(ct, cda);
2206                 if (err < 0)
2207                         return err;
2208         }
2209
2210         if (cda[CTA_SYNPROXY]) {
2211                 err = ctnetlink_change_synproxy(ct, cda);
2212                 if (err < 0)
2213                         return err;
2214         }
2215
2216         if (cda[CTA_LABELS]) {
2217                 err = ctnetlink_attach_labels(ct, cda);
2218                 if (err < 0)
2219                         return err;
2220         }
2221
2222         return 0;
2223 }
2224
2225 static struct nf_conn *
2226 ctnetlink_create_conntrack(struct net *net,
2227                            const struct nf_conntrack_zone *zone,
2228                            const struct nlattr * const cda[],
2229                            struct nf_conntrack_tuple *otuple,
2230                            struct nf_conntrack_tuple *rtuple,
2231                            u8 u3)
2232 {
2233         struct nf_conn *ct;
2234         int err = -EINVAL;
2235         struct nf_conntrack_helper *helper;
2236         struct nf_conn_tstamp *tstamp;
2237         u64 timeout;
2238
2239         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
2240         if (IS_ERR(ct))
2241                 return ERR_PTR(-ENOMEM);
2242
2243         if (!cda[CTA_TIMEOUT])
2244                 goto err1;
2245
2246         timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
2247         if (timeout > INT_MAX)
2248                 timeout = INT_MAX;
2249         ct->timeout = (u32)timeout + nfct_time_stamp;
2250
2251         rcu_read_lock();
2252         if (cda[CTA_HELP]) {
2253                 char *helpname = NULL;
2254                 struct nlattr *helpinfo = NULL;
2255
2256                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
2257                 if (err < 0)
2258                         goto err2;
2259
2260                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2261                                                     nf_ct_protonum(ct));
2262                 if (helper == NULL) {
2263                         rcu_read_unlock();
2264 #ifdef CONFIG_MODULES
2265                         if (request_module("nfct-helper-%s", helpname) < 0) {
2266                                 err = -EOPNOTSUPP;
2267                                 goto err1;
2268                         }
2269
2270                         rcu_read_lock();
2271                         helper = __nf_conntrack_helper_find(helpname,
2272                                                             nf_ct_l3num(ct),
2273                                                             nf_ct_protonum(ct));
2274                         if (helper) {
2275                                 err = -EAGAIN;
2276                                 goto err2;
2277                         }
2278                         rcu_read_unlock();
2279 #endif
2280                         err = -EOPNOTSUPP;
2281                         goto err1;
2282                 } else {
2283                         struct nf_conn_help *help;
2284
2285                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
2286                         if (help == NULL) {
2287                                 err = -ENOMEM;
2288                                 goto err2;
2289                         }
2290                         /* set private helper data if allowed. */
2291                         if (helper->from_nlattr)
2292                                 helper->from_nlattr(helpinfo, ct);
2293
2294                         /* not in hash table yet so not strictly necessary */
2295                         RCU_INIT_POINTER(help->helper, helper);
2296                 }
2297         } else {
2298                 /* try an implicit helper assignation */
2299                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
2300                 if (err < 0)
2301                         goto err2;
2302         }
2303
2304         err = ctnetlink_setup_nat(ct, cda);
2305         if (err < 0)
2306                 goto err2;
2307
2308         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
2309         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
2310         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
2311         nf_ct_labels_ext_add(ct);
2312         nfct_seqadj_ext_add(ct);
2313         nfct_synproxy_ext_add(ct);
2314
2315         /* we must add conntrack extensions before confirmation. */
2316         ct->status |= IPS_CONFIRMED;
2317
2318         if (cda[CTA_STATUS]) {
2319                 err = ctnetlink_change_status(ct, cda);
2320                 if (err < 0)
2321                         goto err2;
2322         }
2323
2324         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
2325                 err = ctnetlink_change_seq_adj(ct, cda);
2326                 if (err < 0)
2327                         goto err2;
2328         }
2329
2330         memset(&ct->proto, 0, sizeof(ct->proto));
2331         if (cda[CTA_PROTOINFO]) {
2332                 err = ctnetlink_change_protoinfo(ct, cda);
2333                 if (err < 0)
2334                         goto err2;
2335         }
2336
2337         if (cda[CTA_SYNPROXY]) {
2338                 err = ctnetlink_change_synproxy(ct, cda);
2339                 if (err < 0)
2340                         goto err2;
2341         }
2342
2343 #if defined(CONFIG_NF_CONNTRACK_MARK)
2344         if (cda[CTA_MARK])
2345                 ctnetlink_change_mark(ct, cda);
2346 #endif
2347
2348         /* setup master conntrack: this is a confirmed expectation */
2349         if (cda[CTA_TUPLE_MASTER]) {
2350                 struct nf_conntrack_tuple master;
2351                 struct nf_conntrack_tuple_hash *master_h;
2352                 struct nf_conn *master_ct;
2353
2354                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
2355                                             u3, NULL);
2356                 if (err < 0)
2357                         goto err2;
2358
2359                 master_h = nf_conntrack_find_get(net, zone, &master);
2360                 if (master_h == NULL) {
2361                         err = -ENOENT;
2362                         goto err2;
2363                 }
2364                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
2365                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
2366                 ct->master = master_ct;
2367         }
2368         tstamp = nf_conn_tstamp_find(ct);
2369         if (tstamp)
2370                 tstamp->start = ktime_get_real_ns();
2371
2372         err = nf_conntrack_hash_check_insert(ct);
2373         if (err < 0)
2374                 goto err2;
2375
2376         rcu_read_unlock();
2377
2378         return ct;
2379
2380 err2:
2381         rcu_read_unlock();
2382 err1:
2383         nf_conntrack_free(ct);
2384         return ERR_PTR(err);
2385 }
2386
2387 static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
2388                                    struct sk_buff *skb,
2389                                    const struct nlmsghdr *nlh,
2390                                    const struct nlattr * const cda[],
2391                                    struct netlink_ext_ack *extack)
2392 {
2393         struct nf_conntrack_tuple otuple, rtuple;
2394         struct nf_conntrack_tuple_hash *h = NULL;
2395         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2396         struct nf_conn *ct;
2397         u_int8_t u3 = nfmsg->nfgen_family;
2398         struct nf_conntrack_zone zone;
2399         int err;
2400
2401         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
2402         if (err < 0)
2403                 return err;
2404
2405         if (cda[CTA_TUPLE_ORIG]) {
2406                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
2407                                             u3, &zone);
2408                 if (err < 0)
2409                         return err;
2410         }
2411
2412         if (cda[CTA_TUPLE_REPLY]) {
2413                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
2414                                             u3, &zone);
2415                 if (err < 0)
2416                         return err;
2417         }
2418
2419         if (cda[CTA_TUPLE_ORIG])
2420                 h = nf_conntrack_find_get(net, &zone, &otuple);
2421         else if (cda[CTA_TUPLE_REPLY])
2422                 h = nf_conntrack_find_get(net, &zone, &rtuple);
2423
2424         if (h == NULL) {
2425                 err = -ENOENT;
2426                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2427                         enum ip_conntrack_events events;
2428
2429                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
2430                                 return -EINVAL;
2431                         if (otuple.dst.protonum != rtuple.dst.protonum)
2432                                 return -EINVAL;
2433
2434                         ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
2435                                                         &rtuple, u3);
2436                         if (IS_ERR(ct))
2437                                 return PTR_ERR(ct);
2438
2439                         err = 0;
2440                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
2441                                 events = 1 << IPCT_RELATED;
2442                         else
2443                                 events = 1 << IPCT_NEW;
2444
2445                         if (cda[CTA_LABELS] &&
2446                             ctnetlink_attach_labels(ct, cda) == 0)
2447                                 events |= (1 << IPCT_LABEL);
2448
2449                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2450                                                       (1 << IPCT_ASSURED) |
2451                                                       (1 << IPCT_HELPER) |
2452                                                       (1 << IPCT_PROTOINFO) |
2453                                                       (1 << IPCT_SEQADJ) |
2454                                                       (1 << IPCT_MARK) |
2455                                                       (1 << IPCT_SYNPROXY) |
2456                                                       events,
2457                                                       ct, NETLINK_CB(skb).portid,
2458                                                       nlmsg_report(nlh));
2459                         nf_ct_put(ct);
2460                 }
2461
2462                 return err;
2463         }
2464         /* implicit 'else' */
2465
2466         err = -EEXIST;
2467         ct = nf_ct_tuplehash_to_ctrack(h);
2468         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
2469                 err = ctnetlink_change_conntrack(ct, cda);
2470                 if (err == 0) {
2471                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
2472                                                       (1 << IPCT_ASSURED) |
2473                                                       (1 << IPCT_HELPER) |
2474                                                       (1 << IPCT_LABEL) |
2475                                                       (1 << IPCT_PROTOINFO) |
2476                                                       (1 << IPCT_SEQADJ) |
2477                                                       (1 << IPCT_MARK) |
2478                                                       (1 << IPCT_SYNPROXY),
2479                                                       ct, NETLINK_CB(skb).portid,
2480                                                       nlmsg_report(nlh));
2481                 }
2482         }
2483
2484         nf_ct_put(ct);
2485         return err;
2486 }
2487
2488 static int
2489 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2490                                 __u16 cpu, const struct ip_conntrack_stat *st)
2491 {
2492         struct nlmsghdr *nlh;
2493         struct nfgenmsg *nfmsg;
2494         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2495
2496         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
2497                               IPCTNL_MSG_CT_GET_STATS_CPU);
2498         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2499         if (nlh == NULL)
2500                 goto nlmsg_failure;
2501
2502         nfmsg = nlmsg_data(nlh);
2503         nfmsg->nfgen_family = AF_UNSPEC;
2504         nfmsg->version      = NFNETLINK_V0;
2505         nfmsg->res_id       = htons(cpu);
2506
2507         if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
2508             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
2509             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
2510             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
2511                                 htonl(st->insert_failed)) ||
2512             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
2513             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
2514             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
2515             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
2516                                 htonl(st->search_restart)) ||
2517             nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
2518                                 htonl(st->clash_resolve)))
2519                 goto nla_put_failure;
2520
2521         nlmsg_end(skb, nlh);
2522         return skb->len;
2523
2524 nla_put_failure:
2525 nlmsg_failure:
2526         nlmsg_cancel(skb, nlh);
2527         return -1;
2528 }
2529
2530 static int
2531 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2532 {
2533         int cpu;
2534         struct net *net = sock_net(skb->sk);
2535
2536         if (cb->args[0] == nr_cpu_ids)
2537                 return 0;
2538
2539         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2540                 const struct ip_conntrack_stat *st;
2541
2542                 if (!cpu_possible(cpu))
2543                         continue;
2544
2545                 st = per_cpu_ptr(net->ct.stat, cpu);
2546                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
2547                                                     NETLINK_CB(cb->skb).portid,
2548                                                     cb->nlh->nlmsg_seq,
2549                                                     cpu, st) < 0)
2550                                 break;
2551         }
2552         cb->args[0] = cpu;
2553
2554         return skb->len;
2555 }
2556
2557 static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
2558                                  struct sk_buff *skb,
2559                                  const struct nlmsghdr *nlh,
2560                                  const struct nlattr * const cda[],
2561                                  struct netlink_ext_ack *extack)
2562 {
2563         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2564                 struct netlink_dump_control c = {
2565                         .dump = ctnetlink_ct_stat_cpu_dump,
2566                 };
2567                 return netlink_dump_start(ctnl, skb, nlh, &c);
2568         }
2569
2570         return 0;
2571 }
2572
2573 static int
2574 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
2575                             struct net *net)
2576 {
2577         struct nlmsghdr *nlh;
2578         struct nfgenmsg *nfmsg;
2579         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2580         unsigned int nr_conntracks = atomic_read(&net->ct.count);
2581
2582         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
2583         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2584         if (nlh == NULL)
2585                 goto nlmsg_failure;
2586
2587         nfmsg = nlmsg_data(nlh);
2588         nfmsg->nfgen_family = AF_UNSPEC;
2589         nfmsg->version      = NFNETLINK_V0;
2590         nfmsg->res_id       = 0;
2591
2592         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
2593                 goto nla_put_failure;
2594
2595         if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
2596                 goto nla_put_failure;
2597
2598         nlmsg_end(skb, nlh);
2599         return skb->len;
2600
2601 nla_put_failure:
2602 nlmsg_failure:
2603         nlmsg_cancel(skb, nlh);
2604         return -1;
2605 }
2606
2607 static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
2608                              struct sk_buff *skb, const struct nlmsghdr *nlh,
2609                              const struct nlattr * const cda[],
2610                              struct netlink_ext_ack *extack)
2611 {
2612         struct sk_buff *skb2;
2613         int err;
2614
2615         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2616         if (skb2 == NULL)
2617                 return -ENOMEM;
2618
2619         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
2620                                           nlh->nlmsg_seq,
2621                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
2622                                           sock_net(skb->sk));
2623         if (err <= 0)
2624                 goto free;
2625
2626         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2627         if (err < 0)
2628                 goto out;
2629
2630         return 0;
2631
2632 free:
2633         kfree_skb(skb2);
2634 out:
2635         /* this avoids a loop in nfnetlink. */
2636         return err == -EAGAIN ? -ENOBUFS : err;
2637 }
2638
2639 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2640         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2641         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2642         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2643         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2644         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2645         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2646                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2647         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2648         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2649         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2650         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2651         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2652 };
2653
2654 static struct nf_conntrack_expect *
2655 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
2656                        struct nf_conntrack_helper *helper,
2657                        struct nf_conntrack_tuple *tuple,
2658                        struct nf_conntrack_tuple *mask);
2659
2660 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
2661 static size_t
2662 ctnetlink_glue_build_size(const struct nf_conn *ct)
2663 {
2664         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2665                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2666                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2667                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2668                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2669                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2670                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2671                + nla_total_size(0) /* CTA_PROTOINFO */
2672                + nla_total_size(0) /* CTA_HELP */
2673                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2674                + ctnetlink_secctx_size(ct)
2675 #if IS_ENABLED(CONFIG_NF_NAT)
2676                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2677                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2678 #endif
2679 #ifdef CONFIG_NF_CONNTRACK_MARK
2680                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2681 #endif
2682 #ifdef CONFIG_NF_CONNTRACK_ZONES
2683                + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
2684 #endif
2685                + ctnetlink_proto_size(ct)
2686                ;
2687 }
2688
2689 static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
2690                                              enum ip_conntrack_info *ctinfo)
2691 {
2692         return nf_ct_get(skb, ctinfo);
2693 }
2694
2695 static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
2696 {
2697         const struct nf_conntrack_zone *zone;
2698         struct nlattr *nest_parms;
2699
2700         zone = nf_ct_zone(ct);
2701
2702         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
2703         if (!nest_parms)
2704                 goto nla_put_failure;
2705         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2706                 goto nla_put_failure;
2707         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2708                                    NF_CT_ZONE_DIR_ORIG) < 0)
2709                 goto nla_put_failure;
2710         nla_nest_end(skb, nest_parms);
2711
2712         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
2713         if (!nest_parms)
2714                 goto nla_put_failure;
2715         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2716                 goto nla_put_failure;
2717         if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
2718                                    NF_CT_ZONE_DIR_REPL) < 0)
2719                 goto nla_put_failure;
2720         nla_nest_end(skb, nest_parms);
2721
2722         if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
2723                                    NF_CT_DEFAULT_ZONE_DIR) < 0)
2724                 goto nla_put_failure;
2725
2726         if (ctnetlink_dump_id(skb, ct) < 0)
2727                 goto nla_put_failure;
2728
2729         if (ctnetlink_dump_status(skb, ct) < 0)
2730                 goto nla_put_failure;
2731
2732         if (ctnetlink_dump_timeout(skb, ct, false) < 0)
2733                 goto nla_put_failure;
2734
2735         if (ctnetlink_dump_protoinfo(skb, ct, false) < 0)
2736                 goto nla_put_failure;
2737
2738         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2739                 goto nla_put_failure;
2740
2741 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2742         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2743                 goto nla_put_failure;
2744 #endif
2745         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2746                 goto nla_put_failure;
2747
2748         if ((ct->status & IPS_SEQ_ADJUST) &&
2749             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2750                 goto nla_put_failure;
2751
2752         if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
2753                 goto nla_put_failure;
2754
2755 #ifdef CONFIG_NF_CONNTRACK_MARK
2756         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2757                 goto nla_put_failure;
2758 #endif
2759         if (ctnetlink_dump_labels(skb, ct) < 0)
2760                 goto nla_put_failure;
2761         return 0;
2762
2763 nla_put_failure:
2764         return -ENOSPC;
2765 }
2766
2767 static int
2768 ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
2769                      enum ip_conntrack_info ctinfo,
2770                      u_int16_t ct_attr, u_int16_t ct_info_attr)
2771 {
2772         struct nlattr *nest_parms;
2773
2774         nest_parms = nla_nest_start(skb, ct_attr);
2775         if (!nest_parms)
2776                 goto nla_put_failure;
2777
2778         if (__ctnetlink_glue_build(skb, ct) < 0)
2779                 goto nla_put_failure;
2780
2781         nla_nest_end(skb, nest_parms);
2782
2783         if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
2784                 goto nla_put_failure;
2785
2786         return 0;
2787
2788 nla_put_failure:
2789         return -ENOSPC;
2790 }
2791
2792 static int
2793 ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
2794 {
2795         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
2796         unsigned long d = ct->status ^ status;
2797
2798         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
2799                 /* SEEN_REPLY bit can only be set */
2800                 return -EBUSY;
2801
2802         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
2803                 /* ASSURED bit can only be set */
2804                 return -EBUSY;
2805
2806         /* This check is less strict than ctnetlink_change_status()
2807          * because callers often flip IPS_EXPECTED bits when sending
2808          * an NFQA_CT attribute to the kernel.  So ignore the
2809          * unchangeable bits but do not error out. Also user programs
2810          * are allowed to clear the bits that they are allowed to change.
2811          */
2812         __ctnetlink_change_status(ct, status, ~status);
2813         return 0;
2814 }
2815
2816 static int
2817 ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2818 {
2819         int err;
2820
2821         if (cda[CTA_TIMEOUT]) {
2822                 err = ctnetlink_change_timeout(ct, cda);
2823                 if (err < 0)
2824                         return err;
2825         }
2826         if (cda[CTA_STATUS]) {
2827                 err = ctnetlink_update_status(ct, cda);
2828                 if (err < 0)
2829                         return err;
2830         }
2831         if (cda[CTA_HELP]) {
2832                 err = ctnetlink_change_helper(ct, cda);
2833                 if (err < 0)
2834                         return err;
2835         }
2836         if (cda[CTA_LABELS]) {
2837                 err = ctnetlink_attach_labels(ct, cda);
2838                 if (err < 0)
2839                         return err;
2840         }
2841 #if defined(CONFIG_NF_CONNTRACK_MARK)
2842         if (cda[CTA_MARK]) {
2843                 ctnetlink_change_mark(ct, cda);
2844         }
2845 #endif
2846         return 0;
2847 }
2848
2849 static int
2850 ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
2851 {
2852         struct nlattr *cda[CTA_MAX+1];
2853         int ret;
2854
2855         ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
2856                                           NULL);
2857         if (ret < 0)
2858                 return ret;
2859
2860         return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
2861 }
2862
2863 static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
2864                                     const struct nf_conn *ct,
2865                                     struct nf_conntrack_tuple *tuple,
2866                                     struct nf_conntrack_tuple *mask)
2867 {
2868         int err;
2869
2870         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2871                                     nf_ct_l3num(ct), NULL);
2872         if (err < 0)
2873                 return err;
2874
2875         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2876                                      nf_ct_l3num(ct), NULL);
2877 }
2878
2879 static int
2880 ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2881                              u32 portid, u32 report)
2882 {
2883         struct nlattr *cda[CTA_EXPECT_MAX+1];
2884         struct nf_conntrack_tuple tuple, mask;
2885         struct nf_conntrack_helper *helper = NULL;
2886         struct nf_conntrack_expect *exp;
2887         int err;
2888
2889         err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
2890                                           exp_nla_policy, NULL);
2891         if (err < 0)
2892                 return err;
2893
2894         err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
2895                                        ct, &tuple, &mask);
2896         if (err < 0)
2897                 return err;
2898
2899         if (cda[CTA_EXPECT_HELP_NAME]) {
2900                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2901
2902                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2903                                                     nf_ct_protonum(ct));
2904                 if (helper == NULL)
2905                         return -EOPNOTSUPP;
2906         }
2907
2908         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2909                                      helper, &tuple, &mask);
2910         if (IS_ERR(exp))
2911                 return PTR_ERR(exp);
2912
2913         err = nf_ct_expect_related_report(exp, portid, report, 0);
2914         nf_ct_expect_put(exp);
2915         return err;
2916 }
2917
2918 static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
2919                                   enum ip_conntrack_info ctinfo, int diff)
2920 {
2921         if (!(ct->status & IPS_NAT_MASK))
2922                 return;
2923
2924         nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
2925 }
2926
2927 static struct nfnl_ct_hook ctnetlink_glue_hook = {
2928         .get_ct         = ctnetlink_glue_get_ct,
2929         .build_size     = ctnetlink_glue_build_size,
2930         .build          = ctnetlink_glue_build,
2931         .parse          = ctnetlink_glue_parse,
2932         .attach_expect  = ctnetlink_glue_attach_expect,
2933         .seq_adjust     = ctnetlink_glue_seqadj,
2934 };
2935 #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
2936
2937 /***********************************************************************
2938  * EXPECT
2939  ***********************************************************************/
2940
2941 static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2942                                     const struct nf_conntrack_tuple *tuple,
2943                                     u32 type)
2944 {
2945         struct nlattr *nest_parms;
2946
2947         nest_parms = nla_nest_start(skb, type);
2948         if (!nest_parms)
2949                 goto nla_put_failure;
2950         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2951                 goto nla_put_failure;
2952         nla_nest_end(skb, nest_parms);
2953
2954         return 0;
2955
2956 nla_put_failure:
2957         return -1;
2958 }
2959
2960 static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
2961                                    const struct nf_conntrack_tuple *tuple,
2962                                    const struct nf_conntrack_tuple_mask *mask)
2963 {
2964         const struct nf_conntrack_l4proto *l4proto;
2965         struct nf_conntrack_tuple m;
2966         struct nlattr *nest_parms;
2967         int ret;
2968
2969         memset(&m, 0xFF, sizeof(m));
2970         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2971         m.src.u.all = mask->src.u.all;
2972         m.dst.protonum = tuple->dst.protonum;
2973
2974         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
2975         if (!nest_parms)
2976                 goto nla_put_failure;
2977
2978         rcu_read_lock();
2979         ret = ctnetlink_dump_tuples_ip(skb, &m);
2980         if (ret >= 0) {
2981                 l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
2982                 ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2983         }
2984         rcu_read_unlock();
2985
2986         if (unlikely(ret < 0))
2987                 goto nla_put_failure;
2988
2989         nla_nest_end(skb, nest_parms);
2990
2991         return 0;
2992
2993 nla_put_failure:
2994         return -1;
2995 }
2996
2997 static const union nf_inet_addr any_addr;
2998
2999 static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
3000 {
3001         static __read_mostly siphash_key_t exp_id_seed;
3002         unsigned long a, b, c, d;
3003
3004         net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
3005
3006         a = (unsigned long)exp;
3007         b = (unsigned long)exp->helper;
3008         c = (unsigned long)exp->master;
3009         d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
3010
3011 #ifdef CONFIG_64BIT
3012         return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
3013 #else
3014         return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
3015 #endif
3016 }
3017
3018 static int
3019 ctnetlink_exp_dump_expect(struct sk_buff *skb,
3020                           const struct nf_conntrack_expect *exp)
3021 {
3022         struct nf_conn *master = exp->master;
3023         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
3024         struct nf_conn_help *help;
3025 #if IS_ENABLED(CONFIG_NF_NAT)
3026         struct nlattr *nest_parms;
3027         struct nf_conntrack_tuple nat_tuple = {};
3028 #endif
3029         struct nf_ct_helper_expectfn *expfn;
3030
3031         if (timeout < 0)
3032                 timeout = 0;
3033
3034         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
3035                 goto nla_put_failure;
3036         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
3037                 goto nla_put_failure;
3038         if (ctnetlink_exp_dump_tuple(skb,
3039                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
3040                                  CTA_EXPECT_MASTER) < 0)
3041                 goto nla_put_failure;
3042
3043 #if IS_ENABLED(CONFIG_NF_NAT)
3044         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
3045             exp->saved_proto.all) {
3046                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
3047                 if (!nest_parms)
3048                         goto nla_put_failure;
3049
3050                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
3051                         goto nla_put_failure;
3052
3053                 nat_tuple.src.l3num = nf_ct_l3num(master);
3054                 nat_tuple.src.u3 = exp->saved_addr;
3055                 nat_tuple.dst.protonum = nf_ct_protonum(master);
3056                 nat_tuple.src.u = exp->saved_proto;
3057
3058                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
3059                                                 CTA_EXPECT_NAT_TUPLE) < 0)
3060                         goto nla_put_failure;
3061                 nla_nest_end(skb, nest_parms);
3062         }
3063 #endif
3064         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
3065             nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
3066             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
3067             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
3068                 goto nla_put_failure;
3069         help = nfct_help(master);
3070         if (help) {
3071                 struct nf_conntrack_helper *helper;
3072
3073                 helper = rcu_dereference(help->helper);
3074                 if (helper &&
3075                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
3076                         goto nla_put_failure;
3077         }
3078         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
3079         if (expfn != NULL &&
3080             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
3081                 goto nla_put_failure;
3082
3083         return 0;
3084
3085 nla_put_failure:
3086         return -1;
3087 }
3088
3089 static int
3090 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
3091                         int event, const struct nf_conntrack_expect *exp)
3092 {
3093         struct nlmsghdr *nlh;
3094         struct nfgenmsg *nfmsg;
3095         unsigned int flags = portid ? NLM_F_MULTI : 0;
3096
3097         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
3098         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3099         if (nlh == NULL)
3100                 goto nlmsg_failure;
3101
3102         nfmsg = nlmsg_data(nlh);
3103         nfmsg->nfgen_family = exp->tuple.src.l3num;
3104         nfmsg->version      = NFNETLINK_V0;
3105         nfmsg->res_id       = 0;
3106
3107         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3108                 goto nla_put_failure;
3109
3110         nlmsg_end(skb, nlh);
3111         return skb->len;
3112
3113 nlmsg_failure:
3114 nla_put_failure:
3115         nlmsg_cancel(skb, nlh);
3116         return -1;
3117 }
3118
3119 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3120 static int
3121 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
3122 {
3123         struct nf_conntrack_expect *exp = item->exp;
3124         struct net *net = nf_ct_exp_net(exp);
3125         struct nlmsghdr *nlh;
3126         struct nfgenmsg *nfmsg;
3127         struct sk_buff *skb;
3128         unsigned int type, group;
3129         int flags = 0;
3130
3131         if (events & (1 << IPEXP_DESTROY)) {
3132                 type = IPCTNL_MSG_EXP_DELETE;
3133                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
3134         } else if (events & (1 << IPEXP_NEW)) {
3135                 type = IPCTNL_MSG_EXP_NEW;
3136                 flags = NLM_F_CREATE|NLM_F_EXCL;
3137                 group = NFNLGRP_CONNTRACK_EXP_NEW;
3138         } else
3139                 return 0;
3140
3141         if (!item->report && !nfnetlink_has_listeners(net, group))
3142                 return 0;
3143
3144         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
3145         if (skb == NULL)
3146                 goto errout;
3147
3148         type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
3149         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
3150         if (nlh == NULL)
3151                 goto nlmsg_failure;
3152
3153         nfmsg = nlmsg_data(nlh);
3154         nfmsg->nfgen_family = exp->tuple.src.l3num;
3155         nfmsg->version      = NFNETLINK_V0;
3156         nfmsg->res_id       = 0;
3157
3158         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
3159                 goto nla_put_failure;
3160
3161         nlmsg_end(skb, nlh);
3162         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
3163         return 0;
3164
3165 nla_put_failure:
3166         nlmsg_cancel(skb, nlh);
3167 nlmsg_failure:
3168         kfree_skb(skb);
3169 errout:
3170         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
3171         return 0;
3172 }
3173 #endif
3174 static int ctnetlink_exp_done(struct netlink_callback *cb)
3175 {
3176         if (cb->args[1])
3177                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
3178         return 0;
3179 }
3180
3181 static int
3182 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3183 {
3184         struct net *net = sock_net(skb->sk);
3185         struct nf_conntrack_expect *exp, *last;
3186         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3187         u_int8_t l3proto = nfmsg->nfgen_family;
3188
3189         rcu_read_lock();
3190         last = (struct nf_conntrack_expect *)cb->args[1];
3191         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
3192 restart:
3193                 hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
3194                                          hnode) {
3195                         if (l3proto && exp->tuple.src.l3num != l3proto)
3196                                 continue;
3197
3198                         if (!net_eq(nf_ct_net(exp->master), net))
3199                                 continue;
3200
3201                         if (cb->args[1]) {
3202                                 if (exp != last)
3203                                         continue;
3204                                 cb->args[1] = 0;
3205                         }
3206                         if (ctnetlink_exp_fill_info(skb,
3207                                                     NETLINK_CB(cb->skb).portid,
3208                                                     cb->nlh->nlmsg_seq,
3209                                                     IPCTNL_MSG_EXP_NEW,
3210                                                     exp) < 0) {
3211                                 if (!refcount_inc_not_zero(&exp->use))
3212                                         continue;
3213                                 cb->args[1] = (unsigned long)exp;
3214                                 goto out;
3215                         }
3216                 }
3217                 if (cb->args[1]) {
3218                         cb->args[1] = 0;
3219                         goto restart;
3220                 }
3221         }
3222 out:
3223         rcu_read_unlock();
3224         if (last)
3225                 nf_ct_expect_put(last);
3226
3227         return skb->len;
3228 }
3229
3230 static int
3231 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
3232 {
3233         struct nf_conntrack_expect *exp, *last;
3234         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
3235         struct nf_conn *ct = cb->data;
3236         struct nf_conn_help *help = nfct_help(ct);
3237         u_int8_t l3proto = nfmsg->nfgen_family;
3238
3239         if (cb->args[0])
3240                 return 0;
3241
3242         rcu_read_lock();
3243         last = (struct nf_conntrack_expect *)cb->args[1];
3244 restart:
3245         hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
3246                 if (l3proto && exp->tuple.src.l3num != l3proto)
3247                         continue;
3248                 if (cb->args[1]) {
3249                         if (exp != last)
3250                                 continue;
3251                         cb->args[1] = 0;
3252                 }
3253                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
3254                                             cb->nlh->nlmsg_seq,
3255                                             IPCTNL_MSG_EXP_NEW,
3256                                             exp) < 0) {
3257                         if (!refcount_inc_not_zero(&exp->use))
3258                                 continue;
3259                         cb->args[1] = (unsigned long)exp;
3260                         goto out;
3261                 }
3262         }
3263         if (cb->args[1]) {
3264                 cb->args[1] = 0;
3265                 goto restart;
3266         }
3267         cb->args[0] = 1;
3268 out:
3269         rcu_read_unlock();
3270         if (last)
3271                 nf_ct_expect_put(last);
3272
3273         return skb->len;
3274 }
3275
3276 static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
3277                                  struct sk_buff *skb,
3278                                  const struct nlmsghdr *nlh,
3279                                  const struct nlattr * const cda[],
3280                                  struct netlink_ext_ack *extack)
3281 {
3282         int err;
3283         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3284         u_int8_t u3 = nfmsg->nfgen_family;
3285         struct nf_conntrack_tuple tuple;
3286         struct nf_conntrack_tuple_hash *h;
3287         struct nf_conn *ct;
3288         struct nf_conntrack_zone zone;
3289         struct netlink_dump_control c = {
3290                 .dump = ctnetlink_exp_ct_dump_table,
3291                 .done = ctnetlink_exp_done,
3292         };
3293
3294         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3295                                     u3, NULL);
3296         if (err < 0)
3297                 return err;
3298
3299         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3300         if (err < 0)
3301                 return err;
3302
3303         h = nf_conntrack_find_get(net, &zone, &tuple);
3304         if (!h)
3305                 return -ENOENT;
3306
3307         ct = nf_ct_tuplehash_to_ctrack(h);
3308         /* No expectation linked to this connection tracking. */
3309         if (!nfct_help(ct)) {
3310                 nf_ct_put(ct);
3311                 return 0;
3312         }
3313
3314         c.data = ct;
3315
3316         err = netlink_dump_start(ctnl, skb, nlh, &c);
3317         nf_ct_put(ct);
3318
3319         return err;
3320 }
3321
3322 static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
3323                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3324                                 const struct nlattr * const cda[],
3325                                 struct netlink_ext_ack *extack)
3326 {
3327         struct nf_conntrack_tuple tuple;
3328         struct nf_conntrack_expect *exp;
3329         struct sk_buff *skb2;
3330         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3331         u_int8_t u3 = nfmsg->nfgen_family;
3332         struct nf_conntrack_zone zone;
3333         int err;
3334
3335         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3336                 if (cda[CTA_EXPECT_MASTER])
3337                         return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
3338                                                      extack);
3339                 else {
3340                         struct netlink_dump_control c = {
3341                                 .dump = ctnetlink_exp_dump_table,
3342                                 .done = ctnetlink_exp_done,
3343                         };
3344                         return netlink_dump_start(ctnl, skb, nlh, &c);
3345                 }
3346         }
3347
3348         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3349         if (err < 0)
3350                 return err;
3351
3352         if (cda[CTA_EXPECT_TUPLE])
3353                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3354                                             u3, NULL);
3355         else if (cda[CTA_EXPECT_MASTER])
3356                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
3357                                             u3, NULL);
3358         else
3359                 return -EINVAL;
3360
3361         if (err < 0)
3362                 return err;
3363
3364         exp = nf_ct_expect_find_get(net, &zone, &tuple);
3365         if (!exp)
3366                 return -ENOENT;
3367
3368         if (cda[CTA_EXPECT_ID]) {
3369                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3370
3371                 if (id != nf_expect_get_id(exp)) {
3372                         nf_ct_expect_put(exp);
3373                         return -ENOENT;
3374                 }
3375         }
3376
3377         err = -ENOMEM;
3378         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3379         if (skb2 == NULL) {
3380                 nf_ct_expect_put(exp);
3381                 goto out;
3382         }
3383
3384         rcu_read_lock();
3385         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
3386                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
3387         rcu_read_unlock();
3388         nf_ct_expect_put(exp);
3389         if (err <= 0)
3390                 goto free;
3391
3392         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
3393         if (err < 0)
3394                 goto out;
3395
3396         return 0;
3397
3398 free:
3399         kfree_skb(skb2);
3400 out:
3401         /* this avoids a loop in nfnetlink. */
3402         return err == -EAGAIN ? -ENOBUFS : err;
3403 }
3404
3405 static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
3406 {
3407         const struct nf_conn_help *m_help;
3408         const char *name = data;
3409
3410         m_help = nfct_help(exp->master);
3411
3412         return strcmp(m_help->helper->name, name) == 0;
3413 }
3414
3415 static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
3416 {
3417         return true;
3418 }
3419
3420 static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
3421                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3422                                 const struct nlattr * const cda[],
3423                                 struct netlink_ext_ack *extack)
3424 {
3425         struct nf_conntrack_expect *exp;
3426         struct nf_conntrack_tuple tuple;
3427         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3428         u_int8_t u3 = nfmsg->nfgen_family;
3429         struct nf_conntrack_zone zone;
3430         int err;
3431
3432         if (cda[CTA_EXPECT_TUPLE]) {
3433                 /* delete a single expect by tuple */
3434                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3435                 if (err < 0)
3436                         return err;
3437
3438                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3439                                             u3, NULL);
3440                 if (err < 0)
3441                         return err;
3442
3443                 /* bump usage count to 2 */
3444                 exp = nf_ct_expect_find_get(net, &zone, &tuple);
3445                 if (!exp)
3446                         return -ENOENT;
3447
3448                 if (cda[CTA_EXPECT_ID]) {
3449                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
3450                         if (ntohl(id) != (u32)(unsigned long)exp) {
3451                                 nf_ct_expect_put(exp);
3452                                 return -ENOENT;
3453                         }
3454                 }
3455
3456                 /* after list removal, usage count == 1 */
3457                 spin_lock_bh(&nf_conntrack_expect_lock);
3458                 if (del_timer(&exp->timeout)) {
3459                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
3460                                                    nlmsg_report(nlh));
3461                         nf_ct_expect_put(exp);
3462                 }
3463                 spin_unlock_bh(&nf_conntrack_expect_lock);
3464                 /* have to put what we 'get' above.
3465                  * after this line usage count == 0 */
3466                 nf_ct_expect_put(exp);
3467         } else if (cda[CTA_EXPECT_HELP_NAME]) {
3468                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3469
3470                 nf_ct_expect_iterate_net(net, expect_iter_name, name,
3471                                          NETLINK_CB(skb).portid,
3472                                          nlmsg_report(nlh));
3473         } else {
3474                 /* This basically means we have to flush everything*/
3475                 nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
3476                                          NETLINK_CB(skb).portid,
3477                                          nlmsg_report(nlh));
3478         }
3479
3480         return 0;
3481 }
3482 static int
3483 ctnetlink_change_expect(struct nf_conntrack_expect *x,
3484                         const struct nlattr * const cda[])
3485 {
3486         if (cda[CTA_EXPECT_TIMEOUT]) {
3487                 if (!del_timer(&x->timeout))
3488                         return -ETIME;
3489
3490                 x->timeout.expires = jiffies +
3491                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
3492                 add_timer(&x->timeout);
3493         }
3494         return 0;
3495 }
3496
3497 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
3498         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
3499         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
3500 };
3501
3502 static int
3503 ctnetlink_parse_expect_nat(const struct nlattr *attr,
3504                            struct nf_conntrack_expect *exp,
3505                            u_int8_t u3)
3506 {
3507 #if IS_ENABLED(CONFIG_NF_NAT)
3508         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
3509         struct nf_conntrack_tuple nat_tuple = {};
3510         int err;
3511
3512         err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
3513                                           exp_nat_nla_policy, NULL);
3514         if (err < 0)
3515                 return err;
3516
3517         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
3518                 return -EINVAL;
3519
3520         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
3521                                     &nat_tuple, CTA_EXPECT_NAT_TUPLE,
3522                                     u3, NULL);
3523         if (err < 0)
3524                 return err;
3525
3526         exp->saved_addr = nat_tuple.src.u3;
3527         exp->saved_proto = nat_tuple.src.u;
3528         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
3529
3530         return 0;
3531 #else
3532         return -EOPNOTSUPP;
3533 #endif
3534 }
3535
3536 static struct nf_conntrack_expect *
3537 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
3538                        struct nf_conntrack_helper *helper,
3539                        struct nf_conntrack_tuple *tuple,
3540                        struct nf_conntrack_tuple *mask)
3541 {
3542         u_int32_t class = 0;
3543         struct nf_conntrack_expect *exp;
3544         struct nf_conn_help *help;
3545         int err;
3546
3547         help = nfct_help(ct);
3548         if (!help)
3549                 return ERR_PTR(-EOPNOTSUPP);
3550
3551         if (cda[CTA_EXPECT_CLASS] && helper) {
3552                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
3553                 if (class > helper->expect_class_max)
3554                         return ERR_PTR(-EINVAL);
3555         }
3556         exp = nf_ct_expect_alloc(ct);
3557         if (!exp)
3558                 return ERR_PTR(-ENOMEM);
3559
3560         if (cda[CTA_EXPECT_FLAGS]) {
3561                 exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
3562                 exp->flags &= ~NF_CT_EXPECT_USERSPACE;
3563         } else {
3564                 exp->flags = 0;
3565         }
3566         if (cda[CTA_EXPECT_FN]) {
3567                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
3568                 struct nf_ct_helper_expectfn *expfn;
3569
3570                 expfn = nf_ct_helper_expectfn_find_by_name(name);
3571                 if (expfn == NULL) {
3572                         err = -EINVAL;
3573                         goto err_out;
3574                 }
3575                 exp->expectfn = expfn->expectfn;
3576         } else
3577                 exp->expectfn = NULL;
3578
3579         exp->class = class;
3580         exp->master = ct;
3581         exp->helper = helper;
3582         exp->tuple = *tuple;
3583         exp->mask.src.u3 = mask->src.u3;
3584         exp->mask.src.u.all = mask->src.u.all;
3585
3586         if (cda[CTA_EXPECT_NAT]) {
3587                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
3588                                                  exp, nf_ct_l3num(ct));
3589                 if (err < 0)
3590                         goto err_out;
3591         }
3592         return exp;
3593 err_out:
3594         nf_ct_expect_put(exp);
3595         return ERR_PTR(err);
3596 }
3597
3598 static int
3599 ctnetlink_create_expect(struct net *net,
3600                         const struct nf_conntrack_zone *zone,
3601                         const struct nlattr * const cda[],
3602                         u_int8_t u3, u32 portid, int report)
3603 {
3604         struct nf_conntrack_tuple tuple, mask, master_tuple;
3605         struct nf_conntrack_tuple_hash *h = NULL;
3606         struct nf_conntrack_helper *helper = NULL;
3607         struct nf_conntrack_expect *exp;
3608         struct nf_conn *ct;
3609         int err;
3610
3611         /* caller guarantees that those three CTA_EXPECT_* exist */
3612         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3613                                     u3, NULL);
3614         if (err < 0)
3615                 return err;
3616         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
3617                                     u3, NULL);
3618         if (err < 0)
3619                 return err;
3620         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
3621                                     u3, NULL);
3622         if (err < 0)
3623                 return err;
3624
3625         /* Look for master conntrack of this expectation */
3626         h = nf_conntrack_find_get(net, zone, &master_tuple);
3627         if (!h)
3628                 return -ENOENT;
3629         ct = nf_ct_tuplehash_to_ctrack(h);
3630
3631         rcu_read_lock();
3632         if (cda[CTA_EXPECT_HELP_NAME]) {
3633                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
3634
3635                 helper = __nf_conntrack_helper_find(helpname, u3,
3636                                                     nf_ct_protonum(ct));
3637                 if (helper == NULL) {
3638                         rcu_read_unlock();
3639 #ifdef CONFIG_MODULES
3640                         if (request_module("nfct-helper-%s", helpname) < 0) {
3641                                 err = -EOPNOTSUPP;
3642                                 goto err_ct;
3643                         }
3644                         rcu_read_lock();
3645                         helper = __nf_conntrack_helper_find(helpname, u3,
3646                                                             nf_ct_protonum(ct));
3647                         if (helper) {
3648                                 err = -EAGAIN;
3649                                 goto err_rcu;
3650                         }
3651                         rcu_read_unlock();
3652 #endif
3653                         err = -EOPNOTSUPP;
3654                         goto err_ct;
3655                 }
3656         }
3657
3658         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
3659         if (IS_ERR(exp)) {
3660                 err = PTR_ERR(exp);
3661                 goto err_rcu;
3662         }
3663
3664         err = nf_ct_expect_related_report(exp, portid, report, 0);
3665         nf_ct_expect_put(exp);
3666 err_rcu:
3667         rcu_read_unlock();
3668 err_ct:
3669         nf_ct_put(ct);
3670         return err;
3671 }
3672
3673 static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
3674                                 struct sk_buff *skb, const struct nlmsghdr *nlh,
3675                                 const struct nlattr * const cda[],
3676                                 struct netlink_ext_ack *extack)
3677 {
3678         struct nf_conntrack_tuple tuple;
3679         struct nf_conntrack_expect *exp;
3680         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
3681         u_int8_t u3 = nfmsg->nfgen_family;
3682         struct nf_conntrack_zone zone;
3683         int err;
3684
3685         if (!cda[CTA_EXPECT_TUPLE]
3686             || !cda[CTA_EXPECT_MASK]
3687             || !cda[CTA_EXPECT_MASTER])
3688                 return -EINVAL;
3689
3690         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
3691         if (err < 0)
3692                 return err;
3693
3694         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
3695                                     u3, NULL);
3696         if (err < 0)
3697                 return err;
3698
3699         spin_lock_bh(&nf_conntrack_expect_lock);
3700         exp = __nf_ct_expect_find(net, &zone, &tuple);
3701         if (!exp) {
3702                 spin_unlock_bh(&nf_conntrack_expect_lock);
3703                 err = -ENOENT;
3704                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
3705                         err = ctnetlink_create_expect(net, &zone, cda, u3,
3706                                                       NETLINK_CB(skb).portid,
3707                                                       nlmsg_report(nlh));
3708                 }
3709                 return err;
3710         }
3711
3712         err = -EEXIST;
3713         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
3714                 err = ctnetlink_change_expect(exp, cda);
3715         spin_unlock_bh(&nf_conntrack_expect_lock);
3716
3717         return err;
3718 }
3719
3720 static int
3721 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
3722                              const struct ip_conntrack_stat *st)
3723 {
3724         struct nlmsghdr *nlh;
3725         struct nfgenmsg *nfmsg;
3726         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
3727
3728         event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
3729                               IPCTNL_MSG_EXP_GET_STATS_CPU);
3730         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3731         if (nlh == NULL)
3732                 goto nlmsg_failure;
3733
3734         nfmsg = nlmsg_data(nlh);
3735         nfmsg->nfgen_family = AF_UNSPEC;
3736         nfmsg->version      = NFNETLINK_V0;
3737         nfmsg->res_id       = htons(cpu);
3738
3739         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3740             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3741             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3742                 goto nla_put_failure;
3743
3744         nlmsg_end(skb, nlh);
3745         return skb->len;
3746
3747 nla_put_failure:
3748 nlmsg_failure:
3749         nlmsg_cancel(skb, nlh);
3750         return -1;
3751 }
3752
3753 static int
3754 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3755 {
3756         int cpu;
3757         struct net *net = sock_net(skb->sk);
3758
3759         if (cb->args[0] == nr_cpu_ids)
3760                 return 0;
3761
3762         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3763                 const struct ip_conntrack_stat *st;
3764
3765                 if (!cpu_possible(cpu))
3766                         continue;
3767
3768                 st = per_cpu_ptr(net->ct.stat, cpu);
3769                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3770                                                  cb->nlh->nlmsg_seq,
3771                                                  cpu, st) < 0)
3772                         break;
3773         }
3774         cb->args[0] = cpu;
3775
3776         return skb->len;
3777 }
3778
3779 static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
3780                                   struct sk_buff *skb,
3781                                   const struct nlmsghdr *nlh,
3782                                   const struct nlattr * const cda[],
3783                                   struct netlink_ext_ack *extack)
3784 {
3785         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3786                 struct netlink_dump_control c = {
3787                         .dump = ctnetlink_exp_stat_cpu_dump,
3788                 };
3789                 return netlink_dump_start(ctnl, skb, nlh, &c);
3790         }
3791
3792         return 0;
3793 }
3794
3795 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3796 static struct nf_ct_event_notifier ctnl_notifier = {
3797         .fcn = ctnetlink_conntrack_event,
3798 };
3799
3800 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3801         .fcn = ctnetlink_expect_event,
3802 };
3803 #endif
3804
3805 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3806         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3807                                             .attr_count = CTA_MAX,
3808                                             .policy = ct_nla_policy },
3809         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3810                                             .attr_count = CTA_MAX,
3811                                             .policy = ct_nla_policy },
3812         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3813                                             .attr_count = CTA_MAX,
3814                                             .policy = ct_nla_policy },
3815         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3816                                             .attr_count = CTA_MAX,
3817                                             .policy = ct_nla_policy },
3818         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3819         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3820         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3821         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3822 };
3823
3824 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3825         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3826                                             .attr_count = CTA_EXPECT_MAX,
3827                                             .policy = exp_nla_policy },
3828         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3829                                             .attr_count = CTA_EXPECT_MAX,
3830                                             .policy = exp_nla_policy },
3831         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3832                                             .attr_count = CTA_EXPECT_MAX,
3833                                             .policy = exp_nla_policy },
3834         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3835 };
3836
3837 static const struct nfnetlink_subsystem ctnl_subsys = {
3838         .name                           = "conntrack",
3839         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3840         .cb_count                       = IPCTNL_MSG_MAX,
3841         .cb                             = ctnl_cb,
3842 };
3843
3844 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3845         .name                           = "conntrack_expect",
3846         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3847         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3848         .cb                             = ctnl_exp_cb,
3849 };
3850
3851 MODULE_ALIAS("ip_conntrack_netlink");
3852 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3853 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3854
3855 static int __net_init ctnetlink_net_init(struct net *net)
3856 {
3857 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3858         int ret;
3859
3860         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3861         if (ret < 0) {
3862                 pr_err("ctnetlink_init: cannot register notifier.\n");
3863                 goto err_out;
3864         }
3865
3866         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3867         if (ret < 0) {
3868                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3869                 goto err_unreg_notifier;
3870         }
3871 #endif
3872         return 0;
3873
3874 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3875 err_unreg_notifier:
3876         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3877 err_out:
3878         return ret;
3879 #endif
3880 }
3881
3882 static void ctnetlink_net_exit(struct net *net)
3883 {
3884 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3885         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3886         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3887 #endif
3888 }
3889
3890 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3891 {
3892         struct net *net;
3893
3894         list_for_each_entry(net, net_exit_list, exit_list)
3895                 ctnetlink_net_exit(net);
3896
3897         /* wait for other cpus until they are done with ctnl_notifiers */
3898         synchronize_rcu();
3899 }
3900
3901 static struct pernet_operations ctnetlink_net_ops = {
3902         .init           = ctnetlink_net_init,
3903         .exit_batch     = ctnetlink_net_exit_batch,
3904 };
3905
3906 static int __init ctnetlink_init(void)
3907 {
3908         int ret;
3909
3910         ret = nfnetlink_subsys_register(&ctnl_subsys);
3911         if (ret < 0) {
3912                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3913                 goto err_out;
3914         }
3915
3916         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3917         if (ret < 0) {
3918                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3919                 goto err_unreg_subsys;
3920         }
3921
3922         ret = register_pernet_subsys(&ctnetlink_net_ops);
3923         if (ret < 0) {
3924                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3925                 goto err_unreg_exp_subsys;
3926         }
3927 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3928         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3929         RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
3930 #endif
3931         return 0;
3932
3933 err_unreg_exp_subsys:
3934         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3935 err_unreg_subsys:
3936         nfnetlink_subsys_unregister(&ctnl_subsys);
3937 err_out:
3938         return ret;
3939 }
3940
3941 static void __exit ctnetlink_exit(void)
3942 {
3943         unregister_pernet_subsys(&ctnetlink_net_ops);
3944         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3945         nfnetlink_subsys_unregister(&ctnl_subsys);
3946 #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
3947         RCU_INIT_POINTER(nfnl_ct_hook, NULL);
3948 #endif
3949         synchronize_rcu();
3950 }
3951
3952 module_init(ctnetlink_init);
3953 module_exit(ctnetlink_exit);