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
  33 #include <linux/netfilter.h>
  34 #include <net/netlink.h>
  35 #include <net/sock.h>
  36 #include <net/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_core.h>
  38 #include <net/netfilter/nf_conntrack_expect.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40 #include <net/netfilter/nf_conntrack_l3proto.h>
  41 #include <net/netfilter/nf_conntrack_l4proto.h>
  42 #include <net/netfilter/nf_conntrack_tuple.h>
  43 #include <net/netfilter/nf_conntrack_acct.h>
  44 #include <net/netfilter/nf_conntrack_zones.h>
  45 #include <net/netfilter/nf_conntrack_timestamp.h>
  46 #include <net/netfilter/nf_conntrack_labels.h>
  47 #ifdef CONFIG_NF_NAT_NEEDED
  48 #include <net/netfilter/nf_nat_core.h>
  49 #include <net/netfilter/nf_nat_l4proto.h>
  50 #include <net/netfilter/nf_nat_helper.h>
  51 #endif
  52
  53 #include <linux/netfilter/nfnetlink.h>
  54 #include <linux/netfilter/nfnetlink_conntrack.h>
  55
  56 MODULE_LICENSE("GPL");
  57
  58 static char __initdata version[] = "0.93";
  59
  60 static inline int
  61 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  62                             const struct nf_conntrack_tuple *tuple,
  63                             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 | NLA_F_NESTED);
  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 inline int
  86 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  87                          const struct nf_conntrack_tuple *tuple,
  88                          struct nf_conntrack_l3proto *l3proto)
  89 {
  90         int ret = 0;
  91         struct nlattr *nest_parms;
  92
  93         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  94         if (!nest_parms)
  95                 goto nla_put_failure;
  96
  97         if (likely(l3proto->tuple_to_nlattr))
  98                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  99
 100         nla_nest_end(skb, nest_parms);
 101
 102         return ret;
 103
 104 nla_put_failure:
 105         return -1;
 106 }
 107
 108 static int
 109 ctnetlink_dump_tuples(struct sk_buff *skb,
 110                       const struct nf_conntrack_tuple *tuple)
 111 {
 112         int ret;
 113         struct nf_conntrack_l3proto *l3proto;
 114         struct nf_conntrack_l4proto *l4proto;
 115
 116         rcu_read_lock();
 117         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 118         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 119
 120         if (ret >= 0) {
 121                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
 122                                                tuple->dst.protonum);
 123                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 124         }
 125         rcu_read_unlock();
 126         return ret;
 127 }
 128
 129 static inline int
 130 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 131 {
 132         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 133                 goto nla_put_failure;
 134         return 0;
 135
 136 nla_put_failure:
 137         return -1;
 138 }
 139
 140 static inline int
 141 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 142 {
 143         long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
 144
 145         if (timeout < 0)
 146                 timeout = 0;
 147
 148         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 149                 goto nla_put_failure;
 150         return 0;
 151
 152 nla_put_failure:
 153         return -1;
 154 }
 155
 156 static inline int
 157 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 158 {
 159         struct nf_conntrack_l4proto *l4proto;
 160         struct nlattr *nest_proto;
 161         int ret;
 162
 163         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 164         if (!l4proto->to_nlattr)
 165                 return 0;
 166
 167         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 168         if (!nest_proto)
 169                 goto nla_put_failure;
 170
 171         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 172
 173         nla_nest_end(skb, nest_proto);
 174
 175         return ret;
 176
 177 nla_put_failure:
 178         return -1;
 179 }
 180
 181 static inline int
 182 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 183 {
 184         struct nlattr *nest_helper;
 185         const struct nf_conn_help *help = nfct_help(ct);
 186         struct nf_conntrack_helper *helper;
 187
 188         if (!help)
 189                 return 0;
 190
 191         helper = rcu_dereference(help->helper);
 192         if (!helper)
 193                 goto out;
 194
 195         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 196         if (!nest_helper)
 197                 goto nla_put_failure;
 198         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 199                 goto nla_put_failure;
 200
 201         if (helper->to_nlattr)
 202                 helper->to_nlattr(skb, ct);
 203
 204         nla_nest_end(skb, nest_helper);
 205 out:
 206         return 0;
 207
 208 nla_put_failure:
 209         return -1;
 210 }
 211
 212 static int
 213 dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
 214               enum ip_conntrack_dir dir)
 215 {
 216         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 217         struct nlattr *nest_count;
 218
 219         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 220         if (!nest_count)
 221                 goto nla_put_failure;
 222
 223         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
 224             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
 225                 goto nla_put_failure;
 226
 227         nla_nest_end(skb, nest_count);
 228
 229         return 0;
 230
 231 nla_put_failure:
 232         return -1;
 233 }
 234
 235 static int
 236 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 237                         enum ip_conntrack_dir dir, int type)
 238 {
 239         struct nf_conn_counter *acct;
 240         u64 pkts, bytes;
 241
 242         acct = nf_conn_acct_find(ct);
 243         if (!acct)
 244                 return 0;
 245
 246         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 247                 pkts = atomic64_xchg(&acct[dir].packets, 0);
 248                 bytes = atomic64_xchg(&acct[dir].bytes, 0);
 249         } else {
 250                 pkts = atomic64_read(&acct[dir].packets);
 251                 bytes = atomic64_read(&acct[dir].bytes);
 252         }
 253         return dump_counters(skb, pkts, bytes, dir);
 254 }
 255
 256 static int
 257 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 258 {
 259         struct nlattr *nest_count;
 260         const struct nf_conn_tstamp *tstamp;
 261
 262         tstamp = nf_conn_tstamp_find(ct);
 263         if (!tstamp)
 264                 return 0;
 265
 266         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 267         if (!nest_count)
 268                 goto nla_put_failure;
 269
 270         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
 271             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 272                                                cpu_to_be64(tstamp->stop))))
 273                 goto nla_put_failure;
 274         nla_nest_end(skb, nest_count);
 275
 276         return 0;
 277
 278 nla_put_failure:
 279         return -1;
 280 }
 281
 282 #ifdef CONFIG_NF_CONNTRACK_MARK
 283 static inline int
 284 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 285 {
 286         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 287                 goto nla_put_failure;
 288         return 0;
 289
 290 nla_put_failure:
 291         return -1;
 292 }
 293 #else
 294 #define ctnetlink_dump_mark(a, b) (0)
 295 #endif
 296
 297 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 298 static inline int
 299 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 300 {
 301         struct nlattr *nest_secctx;
 302         int len, ret;
 303         char *secctx;
 304
 305         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 306         if (ret)
 307                 return 0;
 308
 309         ret = -1;
 310         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 311         if (!nest_secctx)
 312                 goto nla_put_failure;
 313
 314         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 315                 goto nla_put_failure;
 316         nla_nest_end(skb, nest_secctx);
 317
 318         ret = 0;
 319 nla_put_failure:
 320         security_release_secctx(secctx, len);
 321         return ret;
 322 }
 323 #else
 324 #define ctnetlink_dump_secctx(a, b) (0)
 325 #endif
 326
 327 #ifdef CONFIG_NF_CONNTRACK_LABELS
 328 static int ctnetlink_label_size(const struct nf_conn *ct)
 329 {
 330         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 331
 332         if (!labels)
 333                 return 0;
 334         return nla_total_size(labels->words * sizeof(long));
 335 }
 336
 337 static int
 338 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 339 {
 340         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 341         unsigned int len, i;
 342
 343         if (!labels)
 344                 return 0;
 345
 346         len = labels->words * sizeof(long);
 347         i = 0;
 348         do {
 349                 if (labels->bits[i] != 0)
 350                         return nla_put(skb, CTA_LABELS, len, labels->bits);
 351                 i++;
 352         } while (i < labels->words);
 353
 354         return 0;
 355 }
 356 #else
 357 #define ctnetlink_dump_labels(a, b) (0)
 358 #define ctnetlink_label_size(a) (0)
 359 #endif
 360
 361 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 362
 363 static inline int
 364 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 365 {
 366         struct nlattr *nest_parms;
 367
 368         if (!(ct->status & IPS_EXPECTED))
 369                 return 0;
 370
 371         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 372         if (!nest_parms)
 373                 goto nla_put_failure;
 374         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 375                 goto nla_put_failure;
 376         nla_nest_end(skb, nest_parms);
 377
 378         return 0;
 379
 380 nla_put_failure:
 381         return -1;
 382 }
 383
 384 #ifdef CONFIG_NF_NAT_NEEDED
 385 static int
 386 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 387 {
 388         struct nlattr *nest_parms;
 389
 390         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 391         if (!nest_parms)
 392                 goto nla_put_failure;
 393
 394         if (nla_put_be32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 395                          htonl(natseq->correction_pos)) ||
 396             nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 397                          htonl(natseq->offset_before)) ||
 398             nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 399                          htonl(natseq->offset_after)))
 400                 goto nla_put_failure;
 401
 402         nla_nest_end(skb, nest_parms);
 403
 404         return 0;
 405
 406 nla_put_failure:
 407         return -1;
 408 }
 409
 410 static inline int
 411 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 412 {
 413         struct nf_nat_seq *natseq;
 414         struct nf_conn_nat *nat = nfct_nat(ct);
 415
 416         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 417                 return 0;
 418
 419         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 420         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 421                 return -1;
 422
 423         natseq = &nat->seq[IP_CT_DIR_REPLY];
 424         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 425                 return -1;
 426
 427         return 0;
 428 }
 429 #else
 430 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 431 #endif
 432
 433 static inline int
 434 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 435 {
 436         if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
 437                 goto nla_put_failure;
 438         return 0;
 439
 440 nla_put_failure:
 441         return -1;
 442 }
 443
 444 static inline int
 445 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 446 {
 447         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 448                 goto nla_put_failure;
 449         return 0;
 450
 451 nla_put_failure:
 452         return -1;
 453 }
 454
 455 static int
 456 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 457                     struct nf_conn *ct)
 458 {
 459         struct nlmsghdr *nlh;
 460         struct nfgenmsg *nfmsg;
 461         struct nlattr *nest_parms;
 462         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
 463
 464         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
 465         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
 466         if (nlh == NULL)
 467                 goto nlmsg_failure;
 468
 469         nfmsg = nlmsg_data(nlh);
 470         nfmsg->nfgen_family = nf_ct_l3num(ct);
 471         nfmsg->version      = NFNETLINK_V0;
 472         nfmsg->res_id       = 0;
 473
 474         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 475         if (!nest_parms)
 476                 goto nla_put_failure;
 477         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 478                 goto nla_put_failure;
 479         nla_nest_end(skb, nest_parms);
 480
 481         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 482         if (!nest_parms)
 483                 goto nla_put_failure;
 484         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 485                 goto nla_put_failure;
 486         nla_nest_end(skb, nest_parms);
 487
 488         if (nf_ct_zone(ct) &&
 489             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 490                 goto nla_put_failure;
 491
 492         if (ctnetlink_dump_status(skb, ct) < 0 ||
 493             ctnetlink_dump_timeout(skb, ct) < 0 ||
 494             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
 495             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
 496             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 497             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 498             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 499             ctnetlink_dump_mark(skb, ct) < 0 ||
 500             ctnetlink_dump_secctx(skb, ct) < 0 ||
 501             ctnetlink_dump_labels(skb, ct) < 0 ||
 502             ctnetlink_dump_id(skb, ct) < 0 ||
 503             ctnetlink_dump_use(skb, ct) < 0 ||
 504             ctnetlink_dump_master(skb, ct) < 0 ||
 505             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 506                 goto nla_put_failure;
 507
 508         nlmsg_end(skb, nlh);
 509         return skb->len;
 510
 511 nlmsg_failure:
 512 nla_put_failure:
 513         nlmsg_cancel(skb, nlh);
 514         return -1;
 515 }
 516
 517 static inline size_t
 518 ctnetlink_proto_size(const struct nf_conn *ct)
 519 {
 520         struct nf_conntrack_l3proto *l3proto;
 521         struct nf_conntrack_l4proto *l4proto;
 522         size_t len = 0;
 523
 524         rcu_read_lock();
 525         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 526         len += l3proto->nla_size;
 527
 528         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 529         len += l4proto->nla_size;
 530         rcu_read_unlock();
 531
 532         return len;
 533 }
 534
 535 static inline size_t
 536 ctnetlink_counters_size(const struct nf_conn *ct)
 537 {
 538         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 539                 return 0;
 540         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 541                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 542                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 543                ;
 544 }
 545
 546 static inline int
 547 ctnetlink_secctx_size(const struct nf_conn *ct)
 548 {
 549 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 550         int len, ret;
 551
 552         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 553         if (ret)
 554                 return 0;
 555
 556         return nla_total_size(0) /* CTA_SECCTX */
 557                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 558 #else
 559         return 0;
 560 #endif
 561 }
 562
 563 static inline size_t
 564 ctnetlink_timestamp_size(const struct nf_conn *ct)
 565 {
 566 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 567         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 568                 return 0;
 569         return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
 570 #else
 571         return 0;
 572 #endif
 573 }
 574
 575 static inline size_t
 576 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 577 {
 578         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 579                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 580                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 581                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 582                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 583                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 584                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 585                + ctnetlink_counters_size(ct)
 586                + ctnetlink_timestamp_size(ct)
 587                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 588                + nla_total_size(0) /* CTA_PROTOINFO */
 589                + nla_total_size(0) /* CTA_HELP */
 590                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 591                + ctnetlink_secctx_size(ct)
 592 #ifdef CONFIG_NF_NAT_NEEDED
 593                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 594                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 595 #endif
 596 #ifdef CONFIG_NF_CONNTRACK_MARK
 597                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 598 #endif
 599                + ctnetlink_proto_size(ct)
 600                + ctnetlink_label_size(ct)
 601                ;
 602 }
 603
 604 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 605 static int
 606 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 607 {
 608         struct net *net;
 609         struct nlmsghdr *nlh;
 610         struct nfgenmsg *nfmsg;
 611         struct nlattr *nest_parms;
 612         struct nf_conn *ct = item->ct;
 613         struct sk_buff *skb;
 614         unsigned int type;
 615         unsigned int flags = 0, group;
 616         int err;
 617
 618         /* ignore our fake conntrack entry */
 619         if (nf_ct_is_untracked(ct))
 620                 return 0;
 621
 622         if (events & (1 << IPCT_DESTROY)) {
 623                 type = IPCTNL_MSG_CT_DELETE;
 624                 group = NFNLGRP_CONNTRACK_DESTROY;
 625         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 626                 type = IPCTNL_MSG_CT_NEW;
 627                 flags = NLM_F_CREATE|NLM_F_EXCL;
 628                 group = NFNLGRP_CONNTRACK_NEW;
 629         } else  if (events) {
 630                 type = IPCTNL_MSG_CT_NEW;
 631                 group = NFNLGRP_CONNTRACK_UPDATE;
 632         } else
 633                 return 0;
 634
 635         net = nf_ct_net(ct);
 636         if (!item->report && !nfnetlink_has_listeners(net, group))
 637                 return 0;
 638
 639         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 640         if (skb == NULL)
 641                 goto errout;
 642
 643         type |= NFNL_SUBSYS_CTNETLINK << 8;
 644         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
 645         if (nlh == NULL)
 646                 goto nlmsg_failure;
 647
 648         nfmsg = nlmsg_data(nlh);
 649         nfmsg->nfgen_family = nf_ct_l3num(ct);
 650         nfmsg->version  = NFNETLINK_V0;
 651         nfmsg->res_id   = 0;
 652
 653         rcu_read_lock();
 654         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 655         if (!nest_parms)
 656                 goto nla_put_failure;
 657         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 658                 goto nla_put_failure;
 659         nla_nest_end(skb, nest_parms);
 660
 661         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 662         if (!nest_parms)
 663                 goto nla_put_failure;
 664         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 665                 goto nla_put_failure;
 666         nla_nest_end(skb, nest_parms);
 667
 668         if (nf_ct_zone(ct) &&
 669             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 670                 goto nla_put_failure;
 671
 672         if (ctnetlink_dump_id(skb, ct) < 0)
 673                 goto nla_put_failure;
 674
 675         if (ctnetlink_dump_status(skb, ct) < 0)
 676                 goto nla_put_failure;
 677
 678         if (events & (1 << IPCT_DESTROY)) {
 679                 if (ctnetlink_dump_counters(skb, ct,
 680                                             IP_CT_DIR_ORIGINAL, type) < 0 ||
 681                     ctnetlink_dump_counters(skb, ct,
 682                                             IP_CT_DIR_REPLY, type) < 0 ||
 683                     ctnetlink_dump_timestamp(skb, ct) < 0)
 684                         goto nla_put_failure;
 685         } else {
 686                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 687                         goto nla_put_failure;
 688
 689                 if (events & (1 << IPCT_PROTOINFO)
 690                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 691                         goto nla_put_failure;
 692
 693                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 694                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 695                         goto nla_put_failure;
 696
 697 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 698                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 699                     && ctnetlink_dump_secctx(skb, ct) < 0)
 700                         goto nla_put_failure;
 701 #endif
 702                 if (events & (1 << IPCT_LABEL) &&
 703                      ctnetlink_dump_labels(skb, ct) < 0)
 704                         goto nla_put_failure;
 705
 706                 if (events & (1 << IPCT_RELATED) &&
 707                     ctnetlink_dump_master(skb, ct) < 0)
 708                         goto nla_put_failure;
 709
 710                 if (events & (1 << IPCT_NATSEQADJ) &&
 711                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 712                         goto nla_put_failure;
 713         }
 714
 715 #ifdef CONFIG_NF_CONNTRACK_MARK
 716         if ((events & (1 << IPCT_MARK) || ct->mark)
 717             && ctnetlink_dump_mark(skb, ct) < 0)
 718                 goto nla_put_failure;
 719 #endif
 720         rcu_read_unlock();
 721
 722         nlmsg_end(skb, nlh);
 723         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 724                              GFP_ATOMIC);
 725         if (err == -ENOBUFS || err == -EAGAIN)
 726                 return -ENOBUFS;
 727
 728         return 0;
 729
 730 nla_put_failure:
 731         rcu_read_unlock();
 732         nlmsg_cancel(skb, nlh);
 733 nlmsg_failure:
 734         kfree_skb(skb);
 735 errout:
 736         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 737                 return -ENOBUFS;
 738
 739         return 0;
 740 }
 741 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 742
 743 static int ctnetlink_done(struct netlink_callback *cb)
 744 {
 745         if (cb->args[1])
 746                 nf_ct_put((struct nf_conn *)cb->args[1]);
 747         if (cb->data)
 748                 kfree(cb->data);
 749         return 0;
 750 }
 751
 752 struct ctnetlink_dump_filter {
 753         struct {
 754                 u_int32_t val;
 755                 u_int32_t mask;
 756         } mark;
 757 };
 758
 759 static int
 760 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 761 {
 762         struct net *net = sock_net(skb->sk);
 763         struct nf_conn *ct, *last;
 764         struct nf_conntrack_tuple_hash *h;
 765         struct hlist_nulls_node *n;
 766         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 767         u_int8_t l3proto = nfmsg->nfgen_family;
 768         int res;
 769 #ifdef CONFIG_NF_CONNTRACK_MARK
 770         const struct ctnetlink_dump_filter *filter = cb->data;
 771 #endif
 772
 773         spin_lock_bh(&nf_conntrack_lock);
 774         last = (struct nf_conn *)cb->args[1];
 775         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 776 restart:
 777                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 778                                          hnnode) {
 779                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 780                                 continue;
 781                         ct = nf_ct_tuplehash_to_ctrack(h);
 782                         /* Dump entries of a given L3 protocol number.
 783                          * If it is not specified, ie. l3proto == 0,
 784                          * then dump everything. */
 785                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 786                                 continue;
 787                         if (cb->args[1]) {
 788                                 if (ct != last)
 789                                         continue;
 790                                 cb->args[1] = 0;
 791                         }
 792 #ifdef CONFIG_NF_CONNTRACK_MARK
 793                         if (filter && !((ct->mark & filter->mark.mask) ==
 794                                         filter->mark.val)) {
 795                                 continue;
 796                         }
 797 #endif
 798                         rcu_read_lock();
 799                         res =
 800                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
 801                                             cb->nlh->nlmsg_seq,
 802                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 803                                             ct);
 804                         rcu_read_unlock();
 805                         if (res < 0) {
 806                                 nf_conntrack_get(&ct->ct_general);
 807                                 cb->args[1] = (unsigned long)ct;
 808                                 goto out;
 809                         }
 810                 }
 811                 if (cb->args[1]) {
 812                         cb->args[1] = 0;
 813                         goto restart;
 814                 }
 815         }
 816 out:
 817         spin_unlock_bh(&nf_conntrack_lock);
 818         if (last)
 819                 nf_ct_put(last);
 820
 821         return skb->len;
 822 }
 823
 824 static inline int
 825 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 826 {
 827         struct nlattr *tb[CTA_IP_MAX+1];
 828         struct nf_conntrack_l3proto *l3proto;
 829         int ret = 0;
 830
 831         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 832
 833         rcu_read_lock();
 834         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 835
 836         if (likely(l3proto->nlattr_to_tuple)) {
 837                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 838                                           l3proto->nla_policy);
 839                 if (ret == 0)
 840                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 841         }
 842
 843         rcu_read_unlock();
 844
 845         return ret;
 846 }
 847
 848 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 849         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 850 };
 851
 852 static inline int
 853 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 854                             struct nf_conntrack_tuple *tuple)
 855 {
 856         struct nlattr *tb[CTA_PROTO_MAX+1];
 857         struct nf_conntrack_l4proto *l4proto;
 858         int ret = 0;
 859
 860         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 861         if (ret < 0)
 862                 return ret;
 863
 864         if (!tb[CTA_PROTO_NUM])
 865                 return -EINVAL;
 866         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 867
 868         rcu_read_lock();
 869         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 870
 871         if (likely(l4proto->nlattr_to_tuple)) {
 872                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 873                                           l4proto->nla_policy);
 874                 if (ret == 0)
 875                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 876         }
 877
 878         rcu_read_unlock();
 879
 880         return ret;
 881 }
 882
 883 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 884         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 885         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 886 };
 887
 888 static int
 889 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 890                       struct nf_conntrack_tuple *tuple,
 891                       enum ctattr_type type, u_int8_t l3num)
 892 {
 893         struct nlattr *tb[CTA_TUPLE_MAX+1];
 894         int err;
 895
 896         memset(tuple, 0, sizeof(*tuple));
 897
 898         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 899
 900         if (!tb[CTA_TUPLE_IP])
 901                 return -EINVAL;
 902
 903         tuple->src.l3num = l3num;
 904
 905         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 906         if (err < 0)
 907                 return err;
 908
 909         if (!tb[CTA_TUPLE_PROTO])
 910                 return -EINVAL;
 911
 912         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 913         if (err < 0)
 914                 return err;
 915
 916         /* orig and expect tuples get DIR_ORIGINAL */
 917         if (type == CTA_TUPLE_REPLY)
 918                 tuple->dst.dir = IP_CT_DIR_REPLY;
 919         else
 920                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 921
 922         return 0;
 923 }
 924
 925 static int
 926 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 927 {
 928         if (attr)
 929 #ifdef CONFIG_NF_CONNTRACK_ZONES
 930                 *zone = ntohs(nla_get_be16(attr));
 931 #else
 932                 return -EOPNOTSUPP;
 933 #endif
 934         else
 935                 *zone = 0;
 936
 937         return 0;
 938 }
 939
 940 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 941         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
 942                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
 943 };
 944
 945 static inline int
 946 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
 947                      struct nlattr **helpinfo)
 948 {
 949         struct nlattr *tb[CTA_HELP_MAX+1];
 950
 951         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 952
 953         if (!tb[CTA_HELP_NAME])
 954                 return -EINVAL;
 955
 956         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 957
 958         if (tb[CTA_HELP_INFO])
 959                 *helpinfo = tb[CTA_HELP_INFO];
 960
 961         return 0;
 962 }
 963
 964 #define __CTA_LABELS_MAX_LENGTH ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
 965 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 966         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 967         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 968         [CTA_STATUS]            = { .type = NLA_U32 },
 969         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 970         [CTA_HELP]              = { .type = NLA_NESTED },
 971         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 972         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 973         [CTA_MARK]              = { .type = NLA_U32 },
 974         [CTA_ID]                = { .type = NLA_U32 },
 975         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 976         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 977         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
 978         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
 979         [CTA_ZONE]              = { .type = NLA_U16 },
 980         [CTA_MARK_MASK]         = { .type = NLA_U32 },
 981         [CTA_LABELS]            = { .type = NLA_BINARY,
 982                                     .len = __CTA_LABELS_MAX_LENGTH },
 983         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
 984                                     .len = __CTA_LABELS_MAX_LENGTH },
 985 };
 986
 987 static int
 988 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 989                         const struct nlmsghdr *nlh,
 990                         const struct nlattr * const cda[])
 991 {
 992         struct net *net = sock_net(ctnl);
 993         struct nf_conntrack_tuple_hash *h;
 994         struct nf_conntrack_tuple tuple;
 995         struct nf_conn *ct;
 996         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 997         u_int8_t u3 = nfmsg->nfgen_family;
 998         u16 zone;
 999         int err;
1000
1001         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1002         if (err < 0)
1003                 return err;
1004
1005         if (cda[CTA_TUPLE_ORIG])
1006                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1007         else if (cda[CTA_TUPLE_REPLY])
1008                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1009         else {
1010                 /* Flush the whole table */
1011                 nf_conntrack_flush_report(net,
1012                                          NETLINK_CB(skb).portid,
1013                                          nlmsg_report(nlh));
1014                 return 0;
1015         }
1016
1017         if (err < 0)
1018                 return err;
1019
1020         h = nf_conntrack_find_get(net, zone, &tuple);
1021         if (!h)
1022                 return -ENOENT;
1023
1024         ct = nf_ct_tuplehash_to_ctrack(h);
1025
1026         if (cda[CTA_ID]) {
1027                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1028                 if (id != (u32)(unsigned long)ct) {
1029                         nf_ct_put(ct);
1030                         return -ENOENT;
1031                 }
1032         }
1033
1034         if (del_timer(&ct->timeout)) {
1035                 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
1036                                               NETLINK_CB(skb).portid,
1037                                               nlmsg_report(nlh)) < 0) {
1038                         nf_ct_delete_from_lists(ct);
1039                         /* we failed to report the event, try later */
1040                         nf_ct_dying_timeout(ct);
1041                         nf_ct_put(ct);
1042                         return 0;
1043                 }
1044                 /* death_by_timeout would report the event again */
1045                 set_bit(IPS_DYING_BIT, &ct->status);
1046                 nf_ct_delete_from_lists(ct);
1047                 nf_ct_put(ct);
1048         }
1049         nf_ct_put(ct);
1050
1051         return 0;
1052 }
1053
1054 static int
1055 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1056                         const struct nlmsghdr *nlh,
1057                         const struct nlattr * const cda[])
1058 {
1059         struct net *net = sock_net(ctnl);
1060         struct nf_conntrack_tuple_hash *h;
1061         struct nf_conntrack_tuple tuple;
1062         struct nf_conn *ct;
1063         struct sk_buff *skb2 = NULL;
1064         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1065         u_int8_t u3 = nfmsg->nfgen_family;
1066         u16 zone;
1067         int err;
1068
1069         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1070                 struct netlink_dump_control c = {
1071                         .dump = ctnetlink_dump_table,
1072                         .done = ctnetlink_done,
1073                 };
1074 #ifdef CONFIG_NF_CONNTRACK_MARK
1075                 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1076                         struct ctnetlink_dump_filter *filter;
1077
1078                         filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1079                                          GFP_ATOMIC);
1080                         if (filter == NULL)
1081                                 return -ENOMEM;
1082
1083                         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1084                         filter->mark.mask =
1085                                 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1086                         c.data = filter;
1087                 }
1088 #endif
1089                 return netlink_dump_start(ctnl, skb, nlh, &c);
1090         }
1091
1092         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1093         if (err < 0)
1094                 return err;
1095
1096         if (cda[CTA_TUPLE_ORIG])
1097                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1098         else if (cda[CTA_TUPLE_REPLY])
1099                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1100         else
1101                 return -EINVAL;
1102
1103         if (err < 0)
1104                 return err;
1105
1106         h = nf_conntrack_find_get(net, zone, &tuple);
1107         if (!h)
1108                 return -ENOENT;
1109
1110         ct = nf_ct_tuplehash_to_ctrack(h);
1111
1112         err = -ENOMEM;
1113         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1114         if (skb2 == NULL) {
1115                 nf_ct_put(ct);
1116                 return -ENOMEM;
1117         }
1118
1119         rcu_read_lock();
1120         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1121                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1122         rcu_read_unlock();
1123         nf_ct_put(ct);
1124         if (err <= 0)
1125                 goto free;
1126
1127         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1128         if (err < 0)
1129                 goto out;
1130
1131         return 0;
1132
1133 free:
1134         kfree_skb(skb2);
1135 out:
1136         /* this avoids a loop in nfnetlink. */
1137         return err == -EAGAIN ? -ENOBUFS : err;
1138 }
1139
1140 static int ctnetlink_done_list(struct netlink_callback *cb)
1141 {
1142         if (cb->args[1])
1143                 nf_ct_put((struct nf_conn *)cb->args[1]);
1144         return 0;
1145 }
1146
1147 static int
1148 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb,
1149                     struct hlist_nulls_head *list)
1150 {
1151         struct nf_conn *ct, *last;
1152         struct nf_conntrack_tuple_hash *h;
1153         struct hlist_nulls_node *n;
1154         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1155         u_int8_t l3proto = nfmsg->nfgen_family;
1156         int res;
1157
1158         if (cb->args[2])
1159                 return 0;
1160
1161         spin_lock_bh(&nf_conntrack_lock);
1162         last = (struct nf_conn *)cb->args[1];
1163 restart:
1164         hlist_nulls_for_each_entry(h, n, list, hnnode) {
1165                 ct = nf_ct_tuplehash_to_ctrack(h);
1166                 if (l3proto && nf_ct_l3num(ct) != l3proto)
1167                         continue;
1168                 if (cb->args[1]) {
1169                         if (ct != last)
1170                                 continue;
1171                         cb->args[1] = 0;
1172                 }
1173                 rcu_read_lock();
1174                 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1175                                           cb->nlh->nlmsg_seq,
1176                                           NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1177                                           ct);
1178                 rcu_read_unlock();
1179                 if (res < 0) {
1180                         nf_conntrack_get(&ct->ct_general);
1181                         cb->args[1] = (unsigned long)ct;
1182                         goto out;
1183                 }
1184         }
1185         if (cb->args[1]) {
1186                 cb->args[1] = 0;
1187                 goto restart;
1188         } else
1189                 cb->args[2] = 1;
1190 out:
1191         spin_unlock_bh(&nf_conntrack_lock);
1192         if (last)
1193                 nf_ct_put(last);
1194
1195         return skb->len;
1196 }
1197
1198 static int
1199 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1200 {
1201         struct net *net = sock_net(skb->sk);
1202
1203         return ctnetlink_dump_list(skb, cb, &net->ct.dying);
1204 }
1205
1206 static int
1207 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1208                        const struct nlmsghdr *nlh,
1209                        const struct nlattr * const cda[])
1210 {
1211         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1212                 struct netlink_dump_control c = {
1213                         .dump = ctnetlink_dump_dying,
1214                         .done = ctnetlink_done_list,
1215                 };
1216                 return netlink_dump_start(ctnl, skb, nlh, &c);
1217         }
1218
1219         return -EOPNOTSUPP;
1220 }
1221
1222 static int
1223 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1224 {
1225         struct net *net = sock_net(skb->sk);
1226
1227         return ctnetlink_dump_list(skb, cb, &net->ct.unconfirmed);
1228 }
1229
1230 static int
1231 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1232                              const struct nlmsghdr *nlh,
1233                              const struct nlattr * const cda[])
1234 {
1235         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1236                 struct netlink_dump_control c = {
1237                         .dump = ctnetlink_dump_unconfirmed,
1238                         .done = ctnetlink_done_list,
1239                 };
1240                 return netlink_dump_start(ctnl, skb, nlh, &c);
1241         }
1242
1243         return -EOPNOTSUPP;
1244 }
1245
1246 #ifdef CONFIG_NF_NAT_NEEDED
1247 static int
1248 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1249                           enum nf_nat_manip_type manip,
1250                           const struct nlattr *attr)
1251 {
1252         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1253         int err;
1254
1255         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1256         if (!parse_nat_setup) {
1257 #ifdef CONFIG_MODULES
1258                 rcu_read_unlock();
1259                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1260                 if (request_module("nf-nat") < 0) {
1261                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1262                         rcu_read_lock();
1263                         return -EOPNOTSUPP;
1264                 }
1265                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1266                 rcu_read_lock();
1267                 if (nfnetlink_parse_nat_setup_hook)
1268                         return -EAGAIN;
1269 #endif
1270                 return -EOPNOTSUPP;
1271         }
1272
1273         err = parse_nat_setup(ct, manip, attr);
1274         if (err == -EAGAIN) {
1275 #ifdef CONFIG_MODULES
1276                 rcu_read_unlock();
1277                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1278                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1279                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1280                         rcu_read_lock();
1281                         return -EOPNOTSUPP;
1282                 }
1283                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1284                 rcu_read_lock();
1285 #else
1286                 err = -EOPNOTSUPP;
1287 #endif
1288         }
1289         return err;
1290 }
1291 #endif
1292
1293 static int
1294 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1295 {
1296         unsigned long d;
1297         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1298         d = ct->status ^ status;
1299
1300         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1301                 /* unchangeable */
1302                 return -EBUSY;
1303
1304         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1305                 /* SEEN_REPLY bit can only be set */
1306                 return -EBUSY;
1307
1308         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1309                 /* ASSURED bit can only be set */
1310                 return -EBUSY;
1311
1312         /* Be careful here, modifying NAT bits can screw up things,
1313          * so don't let users modify them directly if they don't pass
1314          * nf_nat_range. */
1315         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1316         return 0;
1317 }
1318
1319 static int
1320 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1321 {
1322 #ifdef CONFIG_NF_NAT_NEEDED
1323         int ret;
1324
1325         if (cda[CTA_NAT_DST]) {
1326                 ret = ctnetlink_parse_nat_setup(ct,
1327                                                 NF_NAT_MANIP_DST,
1328                                                 cda[CTA_NAT_DST]);
1329                 if (ret < 0)
1330                         return ret;
1331         }
1332         if (cda[CTA_NAT_SRC]) {
1333                 ret = ctnetlink_parse_nat_setup(ct,
1334                                                 NF_NAT_MANIP_SRC,
1335                                                 cda[CTA_NAT_SRC]);
1336                 if (ret < 0)
1337                         return ret;
1338         }
1339         return 0;
1340 #else
1341         return -EOPNOTSUPP;
1342 #endif
1343 }
1344
1345 static inline int
1346 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1347 {
1348         struct nf_conntrack_helper *helper;
1349         struct nf_conn_help *help = nfct_help(ct);
1350         char *helpname = NULL;
1351         struct nlattr *helpinfo = NULL;
1352         int err;
1353
1354         /* don't change helper of sibling connections */
1355         if (ct->master)
1356                 return -EBUSY;
1357
1358         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1359         if (err < 0)
1360                 return err;
1361
1362         if (!strcmp(helpname, "")) {
1363                 if (help && help->helper) {
1364                         /* we had a helper before ... */
1365                         nf_ct_remove_expectations(ct);
1366                         RCU_INIT_POINTER(help->helper, NULL);
1367                 }
1368
1369                 return 0;
1370         }
1371
1372         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1373                                             nf_ct_protonum(ct));
1374         if (helper == NULL) {
1375 #ifdef CONFIG_MODULES
1376                 spin_unlock_bh(&nf_conntrack_lock);
1377
1378                 if (request_module("nfct-helper-%s", helpname) < 0) {
1379                         spin_lock_bh(&nf_conntrack_lock);
1380                         return -EOPNOTSUPP;
1381                 }
1382
1383                 spin_lock_bh(&nf_conntrack_lock);
1384                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1385                                                     nf_ct_protonum(ct));
1386                 if (helper)
1387                         return -EAGAIN;
1388 #endif
1389                 return -EOPNOTSUPP;
1390         }
1391
1392         if (help) {
1393                 if (help->helper == helper) {
1394                         /* update private helper data if allowed. */
1395                         if (helper->from_nlattr)
1396                                 helper->from_nlattr(helpinfo, ct);
1397                         return 0;
1398                 } else
1399                         return -EBUSY;
1400         }
1401
1402         /* we cannot set a helper for an existing conntrack */
1403         return -EOPNOTSUPP;
1404 }
1405
1406 static inline int
1407 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1408 {
1409         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1410
1411         if (!del_timer(&ct->timeout))
1412                 return -ETIME;
1413
1414         ct->timeout.expires = jiffies + timeout * HZ;
1415         add_timer(&ct->timeout);
1416
1417         return 0;
1418 }
1419
1420 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1421         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1422         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1423         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1424 };
1425
1426 static inline int
1427 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1428 {
1429         const struct nlattr *attr = cda[CTA_PROTOINFO];
1430         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1431         struct nf_conntrack_l4proto *l4proto;
1432         int err = 0;
1433
1434         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1435
1436         rcu_read_lock();
1437         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1438         if (l4proto->from_nlattr)
1439                 err = l4proto->from_nlattr(tb, ct);
1440         rcu_read_unlock();
1441
1442         return err;
1443 }
1444
1445 #ifdef CONFIG_NF_NAT_NEEDED
1446 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1447         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1448         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1449         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1450 };
1451
1452 static inline int
1453 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1454 {
1455         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1456
1457         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1458
1459         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1460                 return -EINVAL;
1461
1462         natseq->correction_pos =
1463                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1464
1465         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1466                 return -EINVAL;
1467
1468         natseq->offset_before =
1469                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1470
1471         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1472                 return -EINVAL;
1473
1474         natseq->offset_after =
1475                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1476
1477         return 0;
1478 }
1479
1480 static int
1481 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1482                              const struct nlattr * const cda[])
1483 {
1484         int ret = 0;
1485         struct nf_conn_nat *nat = nfct_nat(ct);
1486
1487         if (!nat)
1488                 return 0;
1489
1490         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1491                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1492                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1493                 if (ret < 0)
1494                         return ret;
1495
1496                 ct->status |= IPS_SEQ_ADJUST;
1497         }
1498
1499         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1500                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1501                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1502                 if (ret < 0)
1503                         return ret;
1504
1505                 ct->status |= IPS_SEQ_ADJUST;
1506         }
1507
1508         return 0;
1509 }
1510 #endif
1511
1512 static int
1513 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1514 {
1515 #ifdef CONFIG_NF_CONNTRACK_LABELS
1516         size_t len = nla_len(cda[CTA_LABELS]);
1517         const void *mask = cda[CTA_LABELS_MASK];
1518
1519         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1520                 return -EINVAL;
1521
1522         if (mask) {
1523                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1524                     nla_len(cda[CTA_LABELS_MASK]) != len)
1525                         return -EINVAL;
1526                 mask = nla_data(cda[CTA_LABELS_MASK]);
1527         }
1528
1529         len /= sizeof(u32);
1530
1531         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1532 #else
1533         return -EOPNOTSUPP;
1534 #endif
1535 }
1536
1537 static int
1538 ctnetlink_change_conntrack(struct nf_conn *ct,
1539                            const struct nlattr * const cda[])
1540 {
1541         int err;
1542
1543         /* only allow NAT changes and master assignation for new conntracks */
1544         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1545                 return -EOPNOTSUPP;
1546
1547         if (cda[CTA_HELP]) {
1548                 err = ctnetlink_change_helper(ct, cda);
1549                 if (err < 0)
1550                         return err;
1551         }
1552
1553         if (cda[CTA_TIMEOUT]) {
1554                 err = ctnetlink_change_timeout(ct, cda);
1555                 if (err < 0)
1556                         return err;
1557         }
1558
1559         if (cda[CTA_STATUS]) {
1560                 err = ctnetlink_change_status(ct, cda);
1561                 if (err < 0)
1562                         return err;
1563         }
1564
1565         if (cda[CTA_PROTOINFO]) {
1566                 err = ctnetlink_change_protoinfo(ct, cda);
1567                 if (err < 0)
1568                         return err;
1569         }
1570
1571 #if defined(CONFIG_NF_CONNTRACK_MARK)
1572         if (cda[CTA_MARK])
1573                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1574 #endif
1575
1576 #ifdef CONFIG_NF_NAT_NEEDED
1577         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1578                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1579                 if (err < 0)
1580                         return err;
1581         }
1582 #endif
1583         if (cda[CTA_LABELS]) {
1584                 err = ctnetlink_attach_labels(ct, cda);
1585                 if (err < 0)
1586                         return err;
1587         }
1588
1589         return 0;
1590 }
1591
1592 static struct nf_conn *
1593 ctnetlink_create_conntrack(struct net *net, u16 zone,
1594                            const struct nlattr * const cda[],
1595                            struct nf_conntrack_tuple *otuple,
1596                            struct nf_conntrack_tuple *rtuple,
1597                            u8 u3)
1598 {
1599         struct nf_conn *ct;
1600         int err = -EINVAL;
1601         struct nf_conntrack_helper *helper;
1602         struct nf_conn_tstamp *tstamp;
1603
1604         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1605         if (IS_ERR(ct))
1606                 return ERR_PTR(-ENOMEM);
1607
1608         if (!cda[CTA_TIMEOUT])
1609                 goto err1;
1610         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1611
1612         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1613
1614         rcu_read_lock();
1615         if (cda[CTA_HELP]) {
1616                 char *helpname = NULL;
1617                 struct nlattr *helpinfo = NULL;
1618
1619                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1620                 if (err < 0)
1621                         goto err2;
1622
1623                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1624                                                     nf_ct_protonum(ct));
1625                 if (helper == NULL) {
1626                         rcu_read_unlock();
1627 #ifdef CONFIG_MODULES
1628                         if (request_module("nfct-helper-%s", helpname) < 0) {
1629                                 err = -EOPNOTSUPP;
1630                                 goto err1;
1631                         }
1632
1633                         rcu_read_lock();
1634                         helper = __nf_conntrack_helper_find(helpname,
1635                                                             nf_ct_l3num(ct),
1636                                                             nf_ct_protonum(ct));
1637                         if (helper) {
1638                                 err = -EAGAIN;
1639                                 goto err2;
1640                         }
1641                         rcu_read_unlock();
1642 #endif
1643                         err = -EOPNOTSUPP;
1644                         goto err1;
1645                 } else {
1646                         struct nf_conn_help *help;
1647
1648                         help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1649                         if (help == NULL) {
1650                                 err = -ENOMEM;
1651                                 goto err2;
1652                         }
1653                         /* set private helper data if allowed. */
1654                         if (helper->from_nlattr)
1655                                 helper->from_nlattr(helpinfo, ct);
1656
1657                         /* not in hash table yet so not strictly necessary */
1658                         RCU_INIT_POINTER(help->helper, helper);
1659                 }
1660         } else {
1661                 /* try an implicit helper assignation */
1662                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1663                 if (err < 0)
1664                         goto err2;
1665         }
1666
1667         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1668                 err = ctnetlink_change_nat(ct, cda);
1669                 if (err < 0)
1670                         goto err2;
1671         }
1672
1673         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1674         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1675         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1676         nf_ct_labels_ext_add(ct);
1677
1678         /* we must add conntrack extensions before confirmation. */
1679         ct->status |= IPS_CONFIRMED;
1680
1681         if (cda[CTA_STATUS]) {
1682                 err = ctnetlink_change_status(ct, cda);
1683                 if (err < 0)
1684                         goto err2;
1685         }
1686
1687 #ifdef CONFIG_NF_NAT_NEEDED
1688         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1689                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1690                 if (err < 0)
1691                         goto err2;
1692         }
1693 #endif
1694
1695         memset(&ct->proto, 0, sizeof(ct->proto));
1696         if (cda[CTA_PROTOINFO]) {
1697                 err = ctnetlink_change_protoinfo(ct, cda);
1698                 if (err < 0)
1699                         goto err2;
1700         }
1701
1702 #if defined(CONFIG_NF_CONNTRACK_MARK)
1703         if (cda[CTA_MARK])
1704                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1705 #endif
1706
1707         /* setup master conntrack: this is a confirmed expectation */
1708         if (cda[CTA_TUPLE_MASTER]) {
1709                 struct nf_conntrack_tuple master;
1710                 struct nf_conntrack_tuple_hash *master_h;
1711                 struct nf_conn *master_ct;
1712
1713                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1714                 if (err < 0)
1715                         goto err2;
1716
1717                 master_h = nf_conntrack_find_get(net, zone, &master);
1718                 if (master_h == NULL) {
1719                         err = -ENOENT;
1720                         goto err2;
1721                 }
1722                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1723                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1724                 ct->master = master_ct;
1725         }
1726         tstamp = nf_conn_tstamp_find(ct);
1727         if (tstamp)
1728                 tstamp->start = ktime_to_ns(ktime_get_real());
1729
1730         err = nf_conntrack_hash_check_insert(ct);
1731         if (err < 0)
1732                 goto err2;
1733
1734         rcu_read_unlock();
1735
1736         return ct;
1737
1738 err2:
1739         rcu_read_unlock();
1740 err1:
1741         nf_conntrack_free(ct);
1742         return ERR_PTR(err);
1743 }
1744
1745 static int
1746 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1747                         const struct nlmsghdr *nlh,
1748                         const struct nlattr * const cda[])
1749 {
1750         struct net *net = sock_net(ctnl);
1751         struct nf_conntrack_tuple otuple, rtuple;
1752         struct nf_conntrack_tuple_hash *h = NULL;
1753         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1754         struct nf_conn *ct;
1755         u_int8_t u3 = nfmsg->nfgen_family;
1756         u16 zone;
1757         int err;
1758
1759         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1760         if (err < 0)
1761                 return err;
1762
1763         if (cda[CTA_TUPLE_ORIG]) {
1764                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1765                 if (err < 0)
1766                         return err;
1767         }
1768
1769         if (cda[CTA_TUPLE_REPLY]) {
1770                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1771                 if (err < 0)
1772                         return err;
1773         }
1774
1775         if (cda[CTA_TUPLE_ORIG])
1776                 h = nf_conntrack_find_get(net, zone, &otuple);
1777         else if (cda[CTA_TUPLE_REPLY])
1778                 h = nf_conntrack_find_get(net, zone, &rtuple);
1779
1780         if (h == NULL) {
1781                 err = -ENOENT;
1782                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1783                         enum ip_conntrack_events events;
1784
1785                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1786                                                         &rtuple, u3);
1787                         if (IS_ERR(ct))
1788                                 return PTR_ERR(ct);
1789
1790                         err = 0;
1791                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1792                                 events = IPCT_RELATED;
1793                         else
1794                                 events = IPCT_NEW;
1795
1796                         if (cda[CTA_LABELS] &&
1797                             ctnetlink_attach_labels(ct, cda) == 0)
1798                                 events |= (1 << IPCT_LABEL);
1799
1800                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1801                                                       (1 << IPCT_ASSURED) |
1802                                                       (1 << IPCT_HELPER) |
1803                                                       (1 << IPCT_PROTOINFO) |
1804                                                       (1 << IPCT_NATSEQADJ) |
1805                                                       (1 << IPCT_MARK) | events,
1806                                                       ct, NETLINK_CB(skb).portid,
1807                                                       nlmsg_report(nlh));
1808                         nf_ct_put(ct);
1809                 }
1810
1811                 return err;
1812         }
1813         /* implicit 'else' */
1814
1815         err = -EEXIST;
1816         ct = nf_ct_tuplehash_to_ctrack(h);
1817         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1818                 spin_lock_bh(&nf_conntrack_lock);
1819                 err = ctnetlink_change_conntrack(ct, cda);
1820                 spin_unlock_bh(&nf_conntrack_lock);
1821                 if (err == 0) {
1822                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1823                                                       (1 << IPCT_ASSURED) |
1824                                                       (1 << IPCT_HELPER) |
1825                                                       (1 << IPCT_PROTOINFO) |
1826                                                       (1 << IPCT_NATSEQADJ) |
1827                                                       (1 << IPCT_MARK),
1828                                                       ct, NETLINK_CB(skb).portid,
1829                                                       nlmsg_report(nlh));
1830                 }
1831         }
1832
1833         nf_ct_put(ct);
1834         return err;
1835 }
1836
1837 static int
1838 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1839                                 __u16 cpu, const struct ip_conntrack_stat *st)
1840 {
1841         struct nlmsghdr *nlh;
1842         struct nfgenmsg *nfmsg;
1843         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1844
1845         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1846         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1847         if (nlh == NULL)
1848                 goto nlmsg_failure;
1849
1850         nfmsg = nlmsg_data(nlh);
1851         nfmsg->nfgen_family = AF_UNSPEC;
1852         nfmsg->version      = NFNETLINK_V0;
1853         nfmsg->res_id       = htons(cpu);
1854
1855         if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1856             nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1857             nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1858             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1859             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1860             nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1861             nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1862             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1863             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1864                                 htonl(st->insert_failed)) ||
1865             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1866             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1867             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1868             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1869                                 htonl(st->search_restart)))
1870                 goto nla_put_failure;
1871
1872         nlmsg_end(skb, nlh);
1873         return skb->len;
1874
1875 nla_put_failure:
1876 nlmsg_failure:
1877         nlmsg_cancel(skb, nlh);
1878         return -1;
1879 }
1880
1881 static int
1882 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1883 {
1884         int cpu;
1885         struct net *net = sock_net(skb->sk);
1886
1887         if (cb->args[0] == nr_cpu_ids)
1888                 return 0;
1889
1890         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1891                 const struct ip_conntrack_stat *st;
1892
1893                 if (!cpu_possible(cpu))
1894                         continue;
1895
1896                 st = per_cpu_ptr(net->ct.stat, cpu);
1897                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1898                                                     NETLINK_CB(cb->skb).portid,
1899                                                     cb->nlh->nlmsg_seq,
1900                                                     cpu, st) < 0)
1901                                 break;
1902         }
1903         cb->args[0] = cpu;
1904
1905         return skb->len;
1906 }
1907
1908 static int
1909 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1910                       const struct nlmsghdr *nlh,
1911                       const struct nlattr * const cda[])
1912 {
1913         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1914                 struct netlink_dump_control c = {
1915                         .dump = ctnetlink_ct_stat_cpu_dump,
1916                 };
1917                 return netlink_dump_start(ctnl, skb, nlh, &c);
1918         }
1919
1920         return 0;
1921 }
1922
1923 static int
1924 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1925                             struct net *net)
1926 {
1927         struct nlmsghdr *nlh;
1928         struct nfgenmsg *nfmsg;
1929         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1930         unsigned int nr_conntracks = atomic_read(&net->ct.count);
1931
1932         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1933         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1934         if (nlh == NULL)
1935                 goto nlmsg_failure;
1936
1937         nfmsg = nlmsg_data(nlh);
1938         nfmsg->nfgen_family = AF_UNSPEC;
1939         nfmsg->version      = NFNETLINK_V0;
1940         nfmsg->res_id       = 0;
1941
1942         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1943                 goto nla_put_failure;
1944
1945         nlmsg_end(skb, nlh);
1946         return skb->len;
1947
1948 nla_put_failure:
1949 nlmsg_failure:
1950         nlmsg_cancel(skb, nlh);
1951         return -1;
1952 }
1953
1954 static int
1955 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1956                   const struct nlmsghdr *nlh,
1957                   const struct nlattr * const cda[])
1958 {
1959         struct sk_buff *skb2;
1960         int err;
1961
1962         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1963         if (skb2 == NULL)
1964                 return -ENOMEM;
1965
1966         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1967                                           nlh->nlmsg_seq,
1968                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
1969                                           sock_net(skb->sk));
1970         if (err <= 0)
1971                 goto free;
1972
1973         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1974         if (err < 0)
1975                 goto out;
1976
1977         return 0;
1978
1979 free:
1980         kfree_skb(skb2);
1981 out:
1982         /* this avoids a loop in nfnetlink. */
1983         return err == -EAGAIN ? -ENOBUFS : err;
1984 }
1985
1986 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
1987 static size_t
1988 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
1989 {
1990         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
1991                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
1992                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
1993                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
1994                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
1995                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
1996                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
1997                + nla_total_size(0) /* CTA_PROTOINFO */
1998                + nla_total_size(0) /* CTA_HELP */
1999                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2000                + ctnetlink_secctx_size(ct)
2001 #ifdef CONFIG_NF_NAT_NEEDED
2002                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2003                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2004 #endif
2005 #ifdef CONFIG_NF_CONNTRACK_MARK
2006                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2007 #endif
2008                + ctnetlink_proto_size(ct)
2009                ;
2010 }
2011
2012 static int
2013 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2014 {
2015         struct nlattr *nest_parms;
2016
2017         rcu_read_lock();
2018         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2019         if (!nest_parms)
2020                 goto nla_put_failure;
2021         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2022                 goto nla_put_failure;
2023         nla_nest_end(skb, nest_parms);
2024
2025         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2026         if (!nest_parms)
2027                 goto nla_put_failure;
2028         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2029                 goto nla_put_failure;
2030         nla_nest_end(skb, nest_parms);
2031
2032         if (nf_ct_zone(ct)) {
2033                 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2034                         goto nla_put_failure;
2035         }
2036
2037         if (ctnetlink_dump_id(skb, ct) < 0)
2038                 goto nla_put_failure;
2039
2040         if (ctnetlink_dump_status(skb, ct) < 0)
2041                 goto nla_put_failure;
2042
2043         if (ctnetlink_dump_timeout(skb, ct) < 0)
2044                 goto nla_put_failure;
2045
2046         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2047                 goto nla_put_failure;
2048
2049         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2050                 goto nla_put_failure;
2051
2052 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2053         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2054                 goto nla_put_failure;
2055 #endif
2056         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2057                 goto nla_put_failure;
2058
2059         if ((ct->status & IPS_SEQ_ADJUST) &&
2060             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
2061                 goto nla_put_failure;
2062
2063 #ifdef CONFIG_NF_CONNTRACK_MARK
2064         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2065                 goto nla_put_failure;
2066 #endif
2067         if (ctnetlink_dump_labels(skb, ct) < 0)
2068                 goto nla_put_failure;
2069         rcu_read_unlock();
2070         return 0;
2071
2072 nla_put_failure:
2073         rcu_read_unlock();
2074         return -ENOSPC;
2075 }
2076
2077 static int
2078 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2079 {
2080         int err;
2081
2082         if (cda[CTA_TIMEOUT]) {
2083                 err = ctnetlink_change_timeout(ct, cda);
2084                 if (err < 0)
2085                         return err;
2086         }
2087         if (cda[CTA_STATUS]) {
2088                 err = ctnetlink_change_status(ct, cda);
2089                 if (err < 0)
2090                         return err;
2091         }
2092         if (cda[CTA_HELP]) {
2093                 err = ctnetlink_change_helper(ct, cda);
2094                 if (err < 0)
2095                         return err;
2096         }
2097         if (cda[CTA_LABELS]) {
2098                 err = ctnetlink_attach_labels(ct, cda);
2099                 if (err < 0)
2100                         return err;
2101         }
2102 #if defined(CONFIG_NF_CONNTRACK_MARK)
2103         if (cda[CTA_MARK])
2104                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2105 #endif
2106         return 0;
2107 }
2108
2109 static int
2110 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2111 {
2112         struct nlattr *cda[CTA_MAX+1];
2113         int ret;
2114
2115         nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2116
2117         spin_lock_bh(&nf_conntrack_lock);
2118         ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2119         spin_unlock_bh(&nf_conntrack_lock);
2120
2121         return ret;
2122 }
2123
2124 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2125         .build_size     = ctnetlink_nfqueue_build_size,
2126         .build          = ctnetlink_nfqueue_build,
2127         .parse          = ctnetlink_nfqueue_parse,
2128 };
2129 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2130
2131 /***********************************************************************
2132  * EXPECT
2133  ***********************************************************************/
2134
2135 static inline int
2136 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2137                          const struct nf_conntrack_tuple *tuple,
2138                          enum ctattr_expect type)
2139 {
2140         struct nlattr *nest_parms;
2141
2142         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2143         if (!nest_parms)
2144                 goto nla_put_failure;
2145         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2146                 goto nla_put_failure;
2147         nla_nest_end(skb, nest_parms);
2148
2149         return 0;
2150
2151 nla_put_failure:
2152         return -1;
2153 }
2154
2155 static inline int
2156 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2157                         const struct nf_conntrack_tuple *tuple,
2158                         const struct nf_conntrack_tuple_mask *mask)
2159 {
2160         int ret;
2161         struct nf_conntrack_l3proto *l3proto;
2162         struct nf_conntrack_l4proto *l4proto;
2163         struct nf_conntrack_tuple m;
2164         struct nlattr *nest_parms;
2165
2166         memset(&m, 0xFF, sizeof(m));
2167         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2168         m.src.u.all = mask->src.u.all;
2169         m.dst.protonum = tuple->dst.protonum;
2170
2171         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2172         if (!nest_parms)
2173                 goto nla_put_failure;
2174
2175         rcu_read_lock();
2176         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2177         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2178         if (ret >= 0) {
2179                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2180                                                tuple->dst.protonum);
2181         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2182         }
2183         rcu_read_unlock();
2184
2185         if (unlikely(ret < 0))
2186                 goto nla_put_failure;
2187
2188         nla_nest_end(skb, nest_parms);
2189
2190         return 0;
2191
2192 nla_put_failure:
2193         return -1;
2194 }
2195
2196 static const union nf_inet_addr any_addr;
2197
2198 static int
2199 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2200                           const struct nf_conntrack_expect *exp)
2201 {
2202         struct nf_conn *master = exp->master;
2203         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2204         struct nf_conn_help *help;
2205 #ifdef CONFIG_NF_NAT_NEEDED
2206         struct nlattr *nest_parms;
2207         struct nf_conntrack_tuple nat_tuple = {};
2208 #endif
2209         struct nf_ct_helper_expectfn *expfn;
2210
2211         if (timeout < 0)
2212                 timeout = 0;
2213
2214         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2215                 goto nla_put_failure;
2216         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2217                 goto nla_put_failure;
2218         if (ctnetlink_exp_dump_tuple(skb,
2219                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2220                                  CTA_EXPECT_MASTER) < 0)
2221                 goto nla_put_failure;
2222
2223 #ifdef CONFIG_NF_NAT_NEEDED
2224         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2225             exp->saved_proto.all) {
2226                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2227                 if (!nest_parms)
2228                         goto nla_put_failure;
2229
2230                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2231                         goto nla_put_failure;
2232
2233                 nat_tuple.src.l3num = nf_ct_l3num(master);
2234                 nat_tuple.src.u3 = exp->saved_addr;
2235                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2236                 nat_tuple.src.u = exp->saved_proto;
2237
2238                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2239                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2240                         goto nla_put_failure;
2241                 nla_nest_end(skb, nest_parms);
2242         }
2243 #endif
2244         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2245             nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2246             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2247             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2248                 goto nla_put_failure;
2249         help = nfct_help(master);
2250         if (help) {
2251                 struct nf_conntrack_helper *helper;
2252
2253                 helper = rcu_dereference(help->helper);
2254                 if (helper &&
2255                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2256                         goto nla_put_failure;
2257         }
2258         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2259         if (expfn != NULL &&
2260             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2261                 goto nla_put_failure;
2262
2263         return 0;
2264
2265 nla_put_failure:
2266         return -1;
2267 }
2268
2269 static int
2270 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2271                         int event, const struct nf_conntrack_expect *exp)
2272 {
2273         struct nlmsghdr *nlh;
2274         struct nfgenmsg *nfmsg;
2275         unsigned int flags = portid ? NLM_F_MULTI : 0;
2276
2277         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2278         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2279         if (nlh == NULL)
2280                 goto nlmsg_failure;
2281
2282         nfmsg = nlmsg_data(nlh);
2283         nfmsg->nfgen_family = exp->tuple.src.l3num;
2284         nfmsg->version      = NFNETLINK_V0;
2285         nfmsg->res_id       = 0;
2286
2287         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2288                 goto nla_put_failure;
2289
2290         nlmsg_end(skb, nlh);
2291         return skb->len;
2292
2293 nlmsg_failure:
2294 nla_put_failure:
2295         nlmsg_cancel(skb, nlh);
2296         return -1;
2297 }
2298
2299 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2300 static int
2301 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2302 {
2303         struct nf_conntrack_expect *exp = item->exp;
2304         struct net *net = nf_ct_exp_net(exp);
2305         struct nlmsghdr *nlh;
2306         struct nfgenmsg *nfmsg;
2307         struct sk_buff *skb;
2308         unsigned int type, group;
2309         int flags = 0;
2310
2311         if (events & (1 << IPEXP_DESTROY)) {
2312                 type = IPCTNL_MSG_EXP_DELETE;
2313                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2314         } else if (events & (1 << IPEXP_NEW)) {
2315                 type = IPCTNL_MSG_EXP_NEW;
2316                 flags = NLM_F_CREATE|NLM_F_EXCL;
2317                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2318         } else
2319                 return 0;
2320
2321         if (!item->report && !nfnetlink_has_listeners(net, group))
2322                 return 0;
2323
2324         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2325         if (skb == NULL)
2326                 goto errout;
2327
2328         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2329         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2330         if (nlh == NULL)
2331                 goto nlmsg_failure;
2332
2333         nfmsg = nlmsg_data(nlh);
2334         nfmsg->nfgen_family = exp->tuple.src.l3num;
2335         nfmsg->version      = NFNETLINK_V0;
2336         nfmsg->res_id       = 0;
2337
2338         rcu_read_lock();
2339         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2340                 goto nla_put_failure;
2341         rcu_read_unlock();
2342
2343         nlmsg_end(skb, nlh);
2344         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2345         return 0;
2346
2347 nla_put_failure:
2348         rcu_read_unlock();
2349         nlmsg_cancel(skb, nlh);
2350 nlmsg_failure:
2351         kfree_skb(skb);
2352 errout:
2353         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2354         return 0;
2355 }
2356 #endif
2357 static int ctnetlink_exp_done(struct netlink_callback *cb)
2358 {
2359         if (cb->args[1])
2360                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2361         return 0;
2362 }
2363
2364 static int
2365 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2366 {
2367         struct net *net = sock_net(skb->sk);
2368         struct nf_conntrack_expect *exp, *last;
2369         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2370         struct hlist_node *n;
2371         u_int8_t l3proto = nfmsg->nfgen_family;
2372
2373         rcu_read_lock();
2374         last = (struct nf_conntrack_expect *)cb->args[1];
2375         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2376 restart:
2377                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
2378                                      hnode) {
2379                         if (l3proto && exp->tuple.src.l3num != l3proto)
2380                                 continue;
2381                         if (cb->args[1]) {
2382                                 if (exp != last)
2383                                         continue;
2384                                 cb->args[1] = 0;
2385                         }
2386                         if (ctnetlink_exp_fill_info(skb,
2387                                                     NETLINK_CB(cb->skb).portid,
2388                                                     cb->nlh->nlmsg_seq,
2389                                                     IPCTNL_MSG_EXP_NEW,
2390                                                     exp) < 0) {
2391                                 if (!atomic_inc_not_zero(&exp->use))
2392                                         continue;
2393                                 cb->args[1] = (unsigned long)exp;
2394                                 goto out;
2395                         }
2396                 }
2397                 if (cb->args[1]) {
2398                         cb->args[1] = 0;
2399                         goto restart;
2400                 }
2401         }
2402 out:
2403         rcu_read_unlock();
2404         if (last)
2405                 nf_ct_expect_put(last);
2406
2407         return skb->len;
2408 }
2409
2410 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
2411         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
2412         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
2413         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
2414         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
2415         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
2416         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
2417                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
2418         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
2419         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
2420         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
2421         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
2422         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
2423 };
2424
2425 static int
2426 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2427                      const struct nlmsghdr *nlh,
2428                      const struct nlattr * const cda[])
2429 {
2430         struct net *net = sock_net(ctnl);
2431         struct nf_conntrack_tuple tuple;
2432         struct nf_conntrack_expect *exp;
2433         struct sk_buff *skb2;
2434         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2435         u_int8_t u3 = nfmsg->nfgen_family;
2436         u16 zone;
2437         int err;
2438
2439         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2440                 struct netlink_dump_control c = {
2441                         .dump = ctnetlink_exp_dump_table,
2442                         .done = ctnetlink_exp_done,
2443                 };
2444                 return netlink_dump_start(ctnl, skb, nlh, &c);
2445         }
2446
2447         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2448         if (err < 0)
2449                 return err;
2450
2451         if (cda[CTA_EXPECT_TUPLE])
2452                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2453         else if (cda[CTA_EXPECT_MASTER])
2454                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2455         else
2456                 return -EINVAL;
2457
2458         if (err < 0)
2459                 return err;
2460
2461         exp = nf_ct_expect_find_get(net, zone, &tuple);
2462         if (!exp)
2463                 return -ENOENT;
2464
2465         if (cda[CTA_EXPECT_ID]) {
2466                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2467                 if (ntohl(id) != (u32)(unsigned long)exp) {
2468                         nf_ct_expect_put(exp);
2469                         return -ENOENT;
2470                 }
2471         }
2472
2473         err = -ENOMEM;
2474         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2475         if (skb2 == NULL) {
2476                 nf_ct_expect_put(exp);
2477                 goto out;
2478         }
2479
2480         rcu_read_lock();
2481         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2482                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2483         rcu_read_unlock();
2484         nf_ct_expect_put(exp);
2485         if (err <= 0)
2486                 goto free;
2487
2488         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2489         if (err < 0)
2490                 goto out;
2491
2492         return 0;
2493
2494 free:
2495         kfree_skb(skb2);
2496 out:
2497         /* this avoids a loop in nfnetlink. */
2498         return err == -EAGAIN ? -ENOBUFS : err;
2499 }
2500
2501 static int
2502 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2503                      const struct nlmsghdr *nlh,
2504                      const struct nlattr * const cda[])
2505 {
2506         struct net *net = sock_net(ctnl);
2507         struct nf_conntrack_expect *exp;
2508         struct nf_conntrack_tuple tuple;
2509         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2510         struct hlist_node *n, *next;
2511         u_int8_t u3 = nfmsg->nfgen_family;
2512         unsigned int i;
2513         u16 zone;
2514         int err;
2515
2516         if (cda[CTA_EXPECT_TUPLE]) {
2517                 /* delete a single expect by tuple */
2518                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2519                 if (err < 0)
2520                         return err;
2521
2522                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2523                 if (err < 0)
2524                         return err;
2525
2526                 /* bump usage count to 2 */
2527                 exp = nf_ct_expect_find_get(net, zone, &tuple);
2528                 if (!exp)
2529                         return -ENOENT;
2530
2531                 if (cda[CTA_EXPECT_ID]) {
2532                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2533                         if (ntohl(id) != (u32)(unsigned long)exp) {
2534                                 nf_ct_expect_put(exp);
2535                                 return -ENOENT;
2536                         }
2537                 }
2538
2539                 /* after list removal, usage count == 1 */
2540                 spin_lock_bh(&nf_conntrack_lock);
2541                 if (del_timer(&exp->timeout)) {
2542                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2543                                                    nlmsg_report(nlh));
2544                         nf_ct_expect_put(exp);
2545                 }
2546                 spin_unlock_bh(&nf_conntrack_lock);
2547                 /* have to put what we 'get' above.
2548                  * after this line usage count == 0 */
2549                 nf_ct_expect_put(exp);
2550         } else if (cda[CTA_EXPECT_HELP_NAME]) {
2551                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2552                 struct nf_conn_help *m_help;
2553
2554                 /* delete all expectations for this helper */
2555                 spin_lock_bh(&nf_conntrack_lock);
2556                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2557                         hlist_for_each_entry_safe(exp, n, next,
2558                                                   &net->ct.expect_hash[i],
2559                                                   hnode) {
2560                                 m_help = nfct_help(exp->master);
2561                                 if (!strcmp(m_help->helper->name, name) &&
2562                                     del_timer(&exp->timeout)) {
2563                                         nf_ct_unlink_expect_report(exp,
2564                                                         NETLINK_CB(skb).portid,
2565                                                         nlmsg_report(nlh));
2566                                         nf_ct_expect_put(exp);
2567                                 }
2568                         }
2569                 }
2570                 spin_unlock_bh(&nf_conntrack_lock);
2571         } else {
2572                 /* This basically means we have to flush everything*/
2573                 spin_lock_bh(&nf_conntrack_lock);
2574                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2575                         hlist_for_each_entry_safe(exp, n, next,
2576                                                   &net->ct.expect_hash[i],
2577                                                   hnode) {
2578                                 if (del_timer(&exp->timeout)) {
2579                                         nf_ct_unlink_expect_report(exp,
2580                                                         NETLINK_CB(skb).portid,
2581                                                         nlmsg_report(nlh));
2582                                         nf_ct_expect_put(exp);
2583                                 }
2584                         }
2585                 }
2586                 spin_unlock_bh(&nf_conntrack_lock);
2587         }
2588
2589         return 0;
2590 }
2591 static int
2592 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2593                         const struct nlattr * const cda[])
2594 {
2595         if (cda[CTA_EXPECT_TIMEOUT]) {
2596                 if (!del_timer(&x->timeout))
2597                         return -ETIME;
2598
2599                 x->timeout.expires = jiffies +
2600                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2601                 add_timer(&x->timeout);
2602         }
2603         return 0;
2604 }
2605
2606 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2607         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
2608         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
2609 };
2610
2611 static int
2612 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2613                            struct nf_conntrack_expect *exp,
2614                            u_int8_t u3)
2615 {
2616 #ifdef CONFIG_NF_NAT_NEEDED
2617         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2618         struct nf_conntrack_tuple nat_tuple = {};
2619         int err;
2620
2621         nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2622
2623         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2624                 return -EINVAL;
2625
2626         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2627                                         &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2628         if (err < 0)
2629                 return err;
2630
2631         exp->saved_addr = nat_tuple.src.u3;
2632         exp->saved_proto = nat_tuple.src.u;
2633         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2634
2635         return 0;
2636 #else
2637         return -EOPNOTSUPP;
2638 #endif
2639 }
2640
2641 static int
2642 ctnetlink_create_expect(struct net *net, u16 zone,
2643                         const struct nlattr * const cda[],
2644                         u_int8_t u3,
2645                         u32 portid, int report)
2646 {
2647         struct nf_conntrack_tuple tuple, mask, master_tuple;
2648         struct nf_conntrack_tuple_hash *h = NULL;
2649         struct nf_conntrack_expect *exp;
2650         struct nf_conn *ct;
2651         struct nf_conn_help *help;
2652         struct nf_conntrack_helper *helper = NULL;
2653         u_int32_t class = 0;
2654         int err = 0;
2655
2656         /* caller guarantees that those three CTA_EXPECT_* exist */
2657         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2658         if (err < 0)
2659                 return err;
2660         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2661         if (err < 0)
2662                 return err;
2663         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2664         if (err < 0)
2665                 return err;
2666
2667         /* Look for master conntrack of this expectation */
2668         h = nf_conntrack_find_get(net, zone, &master_tuple);
2669         if (!h)
2670                 return -ENOENT;
2671         ct = nf_ct_tuplehash_to_ctrack(h);
2672
2673         /* Look for helper of this expectation */
2674         if (cda[CTA_EXPECT_HELP_NAME]) {
2675                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2676
2677                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2678                                                     nf_ct_protonum(ct));
2679                 if (helper == NULL) {
2680 #ifdef CONFIG_MODULES
2681                         if (request_module("nfct-helper-%s", helpname) < 0) {
2682                                 err = -EOPNOTSUPP;
2683                                 goto out;
2684                         }
2685
2686                         helper = __nf_conntrack_helper_find(helpname,
2687                                                             nf_ct_l3num(ct),
2688                                                             nf_ct_protonum(ct));
2689                         if (helper) {
2690                                 err = -EAGAIN;
2691                                 goto out;
2692                         }
2693 #endif
2694                         err = -EOPNOTSUPP;
2695                         goto out;
2696                 }
2697         }
2698
2699         if (cda[CTA_EXPECT_CLASS] && helper) {
2700                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2701                 if (class > helper->expect_class_max) {
2702                         err = -EINVAL;
2703                         goto out;
2704                 }
2705         }
2706         exp = nf_ct_expect_alloc(ct);
2707         if (!exp) {
2708                 err = -ENOMEM;
2709                 goto out;
2710         }
2711         help = nfct_help(ct);
2712         if (!help) {
2713                 if (!cda[CTA_EXPECT_TIMEOUT]) {
2714                         err = -EINVAL;
2715                         goto err_out;
2716                 }
2717                 exp->timeout.expires =
2718                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2719
2720                 exp->flags = NF_CT_EXPECT_USERSPACE;
2721                 if (cda[CTA_EXPECT_FLAGS]) {
2722                         exp->flags |=
2723                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2724                 }
2725         } else {
2726                 if (cda[CTA_EXPECT_FLAGS]) {
2727                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2728                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2729                 } else
2730                         exp->flags = 0;
2731         }
2732         if (cda[CTA_EXPECT_FN]) {
2733                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2734                 struct nf_ct_helper_expectfn *expfn;
2735
2736                 expfn = nf_ct_helper_expectfn_find_by_name(name);
2737                 if (expfn == NULL) {
2738                         err = -EINVAL;
2739                         goto err_out;
2740                 }
2741                 exp->expectfn = expfn->expectfn;
2742         } else
2743                 exp->expectfn = NULL;
2744
2745         exp->class = class;
2746         exp->master = ct;
2747         exp->helper = helper;
2748         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2749         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2750         exp->mask.src.u.all = mask.src.u.all;
2751
2752         if (cda[CTA_EXPECT_NAT]) {
2753                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2754                                                  exp, u3);
2755                 if (err < 0)
2756                         goto err_out;
2757         }
2758         err = nf_ct_expect_related_report(exp, portid, report);
2759 err_out:
2760         nf_ct_expect_put(exp);
2761 out:
2762         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2763         return err;
2764 }
2765
2766 static int
2767 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2768                      const struct nlmsghdr *nlh,
2769                      const struct nlattr * const cda[])
2770 {
2771         struct net *net = sock_net(ctnl);
2772         struct nf_conntrack_tuple tuple;
2773         struct nf_conntrack_expect *exp;
2774         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2775         u_int8_t u3 = nfmsg->nfgen_family;
2776         u16 zone;
2777         int err;
2778
2779         if (!cda[CTA_EXPECT_TUPLE]
2780             || !cda[CTA_EXPECT_MASK]
2781             || !cda[CTA_EXPECT_MASTER])
2782                 return -EINVAL;
2783
2784         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2785         if (err < 0)
2786                 return err;
2787
2788         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2789         if (err < 0)
2790                 return err;
2791
2792         spin_lock_bh(&nf_conntrack_lock);
2793         exp = __nf_ct_expect_find(net, zone, &tuple);
2794
2795         if (!exp) {
2796                 spin_unlock_bh(&nf_conntrack_lock);
2797                 err = -ENOENT;
2798                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2799                         err = ctnetlink_create_expect(net, zone, cda,
2800                                                       u3,
2801                                                       NETLINK_CB(skb).portid,
2802                                                       nlmsg_report(nlh));
2803                 }
2804                 return err;
2805         }
2806
2807         err = -EEXIST;
2808         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2809                 err = ctnetlink_change_expect(exp, cda);
2810         spin_unlock_bh(&nf_conntrack_lock);
2811
2812         return err;
2813 }
2814
2815 static int
2816 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2817                              const struct ip_conntrack_stat *st)
2818 {
2819         struct nlmsghdr *nlh;
2820         struct nfgenmsg *nfmsg;
2821         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2822
2823         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2824         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2825         if (nlh == NULL)
2826                 goto nlmsg_failure;
2827
2828         nfmsg = nlmsg_data(nlh);
2829         nfmsg->nfgen_family = AF_UNSPEC;
2830         nfmsg->version      = NFNETLINK_V0;
2831         nfmsg->res_id       = htons(cpu);
2832
2833         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
2834             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
2835             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
2836                 goto nla_put_failure;
2837
2838         nlmsg_end(skb, nlh);
2839         return skb->len;
2840
2841 nla_put_failure:
2842 nlmsg_failure:
2843         nlmsg_cancel(skb, nlh);
2844         return -1;
2845 }
2846
2847 static int
2848 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
2849 {
2850         int cpu;
2851         struct net *net = sock_net(skb->sk);
2852
2853         if (cb->args[0] == nr_cpu_ids)
2854                 return 0;
2855
2856         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
2857                 const struct ip_conntrack_stat *st;
2858
2859                 if (!cpu_possible(cpu))
2860                         continue;
2861
2862                 st = per_cpu_ptr(net->ct.stat, cpu);
2863                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
2864                                                  cb->nlh->nlmsg_seq,
2865                                                  cpu, st) < 0)
2866                         break;
2867         }
2868         cb->args[0] = cpu;
2869
2870         return skb->len;
2871 }
2872
2873 static int
2874 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
2875                        const struct nlmsghdr *nlh,
2876                        const struct nlattr * const cda[])
2877 {
2878         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2879                 struct netlink_dump_control c = {
2880                         .dump = ctnetlink_exp_stat_cpu_dump,
2881                 };
2882                 return netlink_dump_start(ctnl, skb, nlh, &c);
2883         }
2884
2885         return 0;
2886 }
2887
2888 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2889 static struct nf_ct_event_notifier ctnl_notifier = {
2890         .fcn = ctnetlink_conntrack_event,
2891 };
2892
2893 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2894         .fcn = ctnetlink_expect_event,
2895 };
2896 #endif
2897
2898 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2899         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2900                                             .attr_count = CTA_MAX,
2901                                             .policy = ct_nla_policy },
2902         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2903                                             .attr_count = CTA_MAX,
2904                                             .policy = ct_nla_policy },
2905         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2906                                             .attr_count = CTA_MAX,
2907                                             .policy = ct_nla_policy },
2908         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2909                                             .attr_count = CTA_MAX,
2910                                             .policy = ct_nla_policy },
2911         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
2912         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
2913         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
2914         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
2915 };
2916
2917 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2918         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2919                                             .attr_count = CTA_EXPECT_MAX,
2920                                             .policy = exp_nla_policy },
2921         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2922                                             .attr_count = CTA_EXPECT_MAX,
2923                                             .policy = exp_nla_policy },
2924         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2925                                             .attr_count = CTA_EXPECT_MAX,
2926                                             .policy = exp_nla_policy },
2927         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
2928 };
2929
2930 static const struct nfnetlink_subsystem ctnl_subsys = {
2931         .name                           = "conntrack",
2932         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2933         .cb_count                       = IPCTNL_MSG_MAX,
2934         .cb                             = ctnl_cb,
2935 };
2936
2937 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2938         .name                           = "conntrack_expect",
2939         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2940         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2941         .cb                             = ctnl_exp_cb,
2942 };
2943
2944 MODULE_ALIAS("ip_conntrack_netlink");
2945 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2946 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2947
2948 static int __net_init ctnetlink_net_init(struct net *net)
2949 {
2950 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2951         int ret;
2952
2953         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2954         if (ret < 0) {
2955                 pr_err("ctnetlink_init: cannot register notifier.\n");
2956                 goto err_out;
2957         }
2958
2959         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2960         if (ret < 0) {
2961                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2962                 goto err_unreg_notifier;
2963         }
2964 #endif
2965         return 0;
2966
2967 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2968 err_unreg_notifier:
2969         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2970 err_out:
2971         return ret;
2972 #endif
2973 }
2974
2975 static void ctnetlink_net_exit(struct net *net)
2976 {
2977 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2978         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2979         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2980 #endif
2981 }
2982
2983 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2984 {
2985         struct net *net;
2986
2987         list_for_each_entry(net, net_exit_list, exit_list)
2988                 ctnetlink_net_exit(net);
2989 }
2990
2991 static struct pernet_operations ctnetlink_net_ops = {
2992         .init           = ctnetlink_net_init,
2993         .exit_batch     = ctnetlink_net_exit_batch,
2994 };
2995
2996 static int __init ctnetlink_init(void)
2997 {
2998         int ret;
2999
3000         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3001         ret = nfnetlink_subsys_register(&ctnl_subsys);
3002         if (ret < 0) {
3003                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3004                 goto err_out;
3005         }
3006
3007         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3008         if (ret < 0) {
3009                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3010                 goto err_unreg_subsys;
3011         }
3012
3013         ret = register_pernet_subsys(&ctnetlink_net_ops);
3014         if (ret < 0) {
3015                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3016                 goto err_unreg_exp_subsys;
3017         }
3018 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3019         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3020         RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3021 #endif
3022         return 0;
3023
3024 err_unreg_exp_subsys:
3025         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3026 err_unreg_subsys:
3027         nfnetlink_subsys_unregister(&ctnl_subsys);
3028 err_out:
3029         return ret;
3030 }
3031
3032 static void __exit ctnetlink_exit(void)
3033 {
3034         pr_info("ctnetlink: unregistering from nfnetlink.\n");
3035
3036         unregister_pernet_subsys(&ctnetlink_net_ops);
3037         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3038         nfnetlink_subsys_unregister(&ctnl_subsys);
3039 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3040         RCU_INIT_POINTER(nfq_ct_hook, NULL);
3041 #endif
3042 }
3043
3044 module_init(ctnetlink_init);
3045 module_exit(ctnetlink_exit);