git.oblomov.eu Git - linux-2.6/blob - 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) 2005-2007 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/types.h>
  22 #include <linux/timer.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/errno.h>
  25 #include <linux/netlink.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/notifier.h>
  29
  30 #include <linux/netfilter.h>
  31 #include <net/netlink.h>
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_core.h>
  34 #include <net/netfilter/nf_conntrack_expect.h>
  35 #include <net/netfilter/nf_conntrack_helper.h>
  36 #include <net/netfilter/nf_conntrack_l3proto.h>
  37 #include <net/netfilter/nf_conntrack_l4proto.h>
  38 #include <net/netfilter/nf_conntrack_tuple.h>
  39 #ifdef CONFIG_NF_NAT_NEEDED
  40 #include <net/netfilter/nf_nat_core.h>
  41 #include <net/netfilter/nf_nat_protocol.h>
  42 #endif
  43
  44 #include <linux/netfilter/nfnetlink.h>
  45 #include <linux/netfilter/nfnetlink_conntrack.h>
  46
  47 MODULE_LICENSE("GPL");
  48
  49 static char __initdata version[] = "0.93";
  50
  51 static inline int
  52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  53                             const struct nf_conntrack_tuple *tuple,
  54                             struct nf_conntrack_l4proto *l4proto)
  55 {
  56         int ret = 0;
  57         struct nlattr *nest_parms;
  58
  59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  60         if (!nest_parms)
  61                 goto nla_put_failure;
  62         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  63
  64         if (likely(l4proto->tuple_to_nlattr))
  65                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  66
  67         nla_nest_end(skb, nest_parms);
  68
  69         return ret;
  70
  71 nla_put_failure:
  72         return -1;
  73 }
  74
  75 static inline int
  76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  77                          const struct nf_conntrack_tuple *tuple,
  78                          struct nf_conntrack_l3proto *l3proto)
  79 {
  80         int ret = 0;
  81         struct nlattr *nest_parms;
  82
  83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  84         if (!nest_parms)
  85                 goto nla_put_failure;
  86
  87         if (likely(l3proto->tuple_to_nlattr))
  88                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  89
  90         nla_nest_end(skb, nest_parms);
  91
  92         return ret;
  93
  94 nla_put_failure:
  95         return -1;
  96 }
  97
  98 static int
  99 ctnetlink_dump_tuples(struct sk_buff *skb,
 100                       const struct nf_conntrack_tuple *tuple)
 101 {
 102         int ret;
 103         struct nf_conntrack_l3proto *l3proto;
 104         struct nf_conntrack_l4proto *l4proto;
 105
 106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 108         nf_ct_l3proto_put(l3proto);
 109
 110         if (unlikely(ret < 0))
 111                 return ret;
 112
 113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 115         nf_ct_l4proto_put(l4proto);
 116
 117         return ret;
 118 }
 119
 120 static inline int
 121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 122 {
 123         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 124         return 0;
 125
 126 nla_put_failure:
 127         return -1;
 128 }
 129
 130 static inline int
 131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 132 {
 133         long timeout = (ct->timeout.expires - jiffies) / HZ;
 134
 135         if (timeout < 0)
 136                 timeout = 0;
 137
 138         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 139         return 0;
 140
 141 nla_put_failure:
 142         return -1;
 143 }
 144
 145 static inline int
 146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 147 {
 148         struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 149         struct nlattr *nest_proto;
 150         int ret;
 151
 152         if (!l4proto->to_nlattr) {
 153                 nf_ct_l4proto_put(l4proto);
 154                 return 0;
 155         }
 156
 157         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 158         if (!nest_proto)
 159                 goto nla_put_failure;
 160
 161         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 162
 163         nf_ct_l4proto_put(l4proto);
 164
 165         nla_nest_end(skb, nest_proto);
 166
 167         return ret;
 168
 169 nla_put_failure:
 170         nf_ct_l4proto_put(l4proto);
 171         return -1;
 172 }
 173
 174 static inline int
 175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 176 {
 177         struct nlattr *nest_helper;
 178         const struct nf_conn_help *help = nfct_help(ct);
 179         struct nf_conntrack_helper *helper;
 180
 181         if (!help)
 182                 return 0;
 183
 184         rcu_read_lock();
 185         helper = rcu_dereference(help->helper);
 186         if (!helper)
 187                 goto out;
 188
 189         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 190         if (!nest_helper)
 191                 goto nla_put_failure;
 192         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 193
 194         if (helper->to_nlattr)
 195                 helper->to_nlattr(skb, ct);
 196
 197         nla_nest_end(skb, nest_helper);
 198 out:
 199         rcu_read_unlock();
 200         return 0;
 201
 202 nla_put_failure:
 203         rcu_read_unlock();
 204         return -1;
 205 }
 206
 207 #ifdef CONFIG_NF_CT_ACCT
 208 static int
 209 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 210                         enum ip_conntrack_dir dir)
 211 {
 212         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 213         struct nlattr *nest_count;
 214
 215         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 216         if (!nest_count)
 217                 goto nla_put_failure;
 218
 219         NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
 220                      htonl(ct->counters[dir].packets));
 221         NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
 222                      htonl(ct->counters[dir].bytes));
 223
 224         nla_nest_end(skb, nest_count);
 225
 226         return 0;
 227
 228 nla_put_failure:
 229         return -1;
 230 }
 231 #else
 232 #define ctnetlink_dump_counters(a, b, c) (0)
 233 #endif
 234
 235 #ifdef CONFIG_NF_CONNTRACK_MARK
 236 static inline int
 237 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 238 {
 239         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 240         return 0;
 241
 242 nla_put_failure:
 243         return -1;
 244 }
 245 #else
 246 #define ctnetlink_dump_mark(a, b) (0)
 247 #endif
 248
 249 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 250 static inline int
 251 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 252 {
 253         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 254         return 0;
 255
 256 nla_put_failure:
 257         return -1;
 258 }
 259 #else
 260 #define ctnetlink_dump_secmark(a, b) (0)
 261 #endif
 262
 263 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 264
 265 static inline int
 266 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 267 {
 268         struct nlattr *nest_parms;
 269
 270         if (!(ct->status & IPS_EXPECTED))
 271                 return 0;
 272
 273         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 274         if (!nest_parms)
 275                 goto nla_put_failure;
 276         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 277                 goto nla_put_failure;
 278         nla_nest_end(skb, nest_parms);
 279
 280         return 0;
 281
 282 nla_put_failure:
 283         return -1;
 284 }
 285
 286 #ifdef CONFIG_NF_NAT_NEEDED
 287 static int
 288 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 289 {
 290         struct nlattr *nest_parms;
 291
 292         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 293         if (!nest_parms)
 294                 goto nla_put_failure;
 295
 296         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 297                      htonl(natseq->correction_pos));
 298         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 299                      htonl(natseq->offset_before));
 300         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 301                      htonl(natseq->offset_after));
 302
 303         nla_nest_end(skb, nest_parms);
 304
 305         return 0;
 306
 307 nla_put_failure:
 308         return -1;
 309 }
 310
 311 static inline int
 312 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 313 {
 314         struct nf_nat_seq *natseq;
 315         struct nf_conn_nat *nat = nfct_nat(ct);
 316
 317         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 318                 return 0;
 319
 320         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 321         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 322                 return -1;
 323
 324         natseq = &nat->seq[IP_CT_DIR_REPLY];
 325         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 326                 return -1;
 327
 328         return 0;
 329 }
 330 #else
 331 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 332 #endif
 333
 334 static inline int
 335 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 336 {
 337         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 338         return 0;
 339
 340 nla_put_failure:
 341         return -1;
 342 }
 343
 344 static inline int
 345 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 346 {
 347         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 348         return 0;
 349
 350 nla_put_failure:
 351         return -1;
 352 }
 353
 354 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 355
 356 static int
 357 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 358                     int event, int nowait,
 359                     const struct nf_conn *ct)
 360 {
 361         struct nlmsghdr *nlh;
 362         struct nfgenmsg *nfmsg;
 363         struct nlattr *nest_parms;
 364         unsigned char *b = skb_tail_pointer(skb);
 365
 366         event |= NFNL_SUBSYS_CTNETLINK << 8;
 367         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 368         nfmsg  = NLMSG_DATA(nlh);
 369
 370         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 371         nfmsg->nfgen_family =
 372                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 373         nfmsg->version      = NFNETLINK_V0;
 374         nfmsg->res_id       = 0;
 375
 376         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 377         if (!nest_parms)
 378                 goto nla_put_failure;
 379         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 380                 goto nla_put_failure;
 381         nla_nest_end(skb, nest_parms);
 382
 383         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 384         if (!nest_parms)
 385                 goto nla_put_failure;
 386         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 387                 goto nla_put_failure;
 388         nla_nest_end(skb, nest_parms);
 389
 390         if (ctnetlink_dump_status(skb, ct) < 0 ||
 391             ctnetlink_dump_timeout(skb, ct) < 0 ||
 392             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 393             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 394             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 395             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 396             ctnetlink_dump_mark(skb, ct) < 0 ||
 397             ctnetlink_dump_secmark(skb, ct) < 0 ||
 398             ctnetlink_dump_id(skb, ct) < 0 ||
 399             ctnetlink_dump_use(skb, ct) < 0 ||
 400             ctnetlink_dump_master(skb, ct) < 0 ||
 401             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 402                 goto nla_put_failure;
 403
 404         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 405         return skb->len;
 406
 407 nlmsg_failure:
 408 nla_put_failure:
 409         nlmsg_trim(skb, b);
 410         return -1;
 411 }
 412
 413 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 414 static int ctnetlink_conntrack_event(struct notifier_block *this,
 415                                      unsigned long events, void *ptr)
 416 {
 417         struct nlmsghdr *nlh;
 418         struct nfgenmsg *nfmsg;
 419         struct nlattr *nest_parms;
 420         struct nf_conn *ct = (struct nf_conn *)ptr;
 421         struct sk_buff *skb;
 422         unsigned int type;
 423         sk_buff_data_t b;
 424         unsigned int flags = 0, group;
 425
 426         /* ignore our fake conntrack entry */
 427         if (ct == &nf_conntrack_untracked)
 428                 return NOTIFY_DONE;
 429
 430         if (events & IPCT_DESTROY) {
 431                 type = IPCTNL_MSG_CT_DELETE;
 432                 group = NFNLGRP_CONNTRACK_DESTROY;
 433         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 434                 type = IPCTNL_MSG_CT_NEW;
 435                 flags = NLM_F_CREATE|NLM_F_EXCL;
 436                 group = NFNLGRP_CONNTRACK_NEW;
 437         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 438                 type = IPCTNL_MSG_CT_NEW;
 439                 group = NFNLGRP_CONNTRACK_UPDATE;
 440         } else
 441                 return NOTIFY_DONE;
 442
 443         if (!nfnetlink_has_listeners(group))
 444                 return NOTIFY_DONE;
 445
 446         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 447         if (!skb)
 448                 return NOTIFY_DONE;
 449
 450         b = skb->tail;
 451
 452         type |= NFNL_SUBSYS_CTNETLINK << 8;
 453         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 454         nfmsg = NLMSG_DATA(nlh);
 455
 456         nlh->nlmsg_flags    = flags;
 457         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 458         nfmsg->version  = NFNETLINK_V0;
 459         nfmsg->res_id   = 0;
 460
 461         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 462         if (!nest_parms)
 463                 goto nla_put_failure;
 464         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 465                 goto nla_put_failure;
 466         nla_nest_end(skb, nest_parms);
 467
 468         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 469         if (!nest_parms)
 470                 goto nla_put_failure;
 471         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 472                 goto nla_put_failure;
 473         nla_nest_end(skb, nest_parms);
 474
 475         if (events & IPCT_DESTROY) {
 476                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 477                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 478                         goto nla_put_failure;
 479         } else {
 480                 if (ctnetlink_dump_status(skb, ct) < 0)
 481                         goto nla_put_failure;
 482
 483                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 484                         goto nla_put_failure;
 485
 486                 if (events & IPCT_PROTOINFO
 487                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 488                         goto nla_put_failure;
 489
 490                 if ((events & IPCT_HELPER || nfct_help(ct))
 491                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 492                         goto nla_put_failure;
 493
 494 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 495                 if ((events & IPCT_SECMARK || ct->secmark)
 496                     && ctnetlink_dump_secmark(skb, ct) < 0)
 497                         goto nla_put_failure;
 498 #endif
 499
 500                 if (events & IPCT_COUNTER_FILLING &&
 501                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 502                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 503                         goto nla_put_failure;
 504
 505                 if (events & IPCT_RELATED &&
 506                     ctnetlink_dump_master(skb, ct) < 0)
 507                         goto nla_put_failure;
 508
 509                 if (events & IPCT_NATSEQADJ &&
 510                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 511                         goto nla_put_failure;
 512         }
 513
 514 #ifdef CONFIG_NF_CONNTRACK_MARK
 515         if ((events & IPCT_MARK || ct->mark)
 516             && ctnetlink_dump_mark(skb, ct) < 0)
 517                 goto nla_put_failure;
 518 #endif
 519
 520         nlh->nlmsg_len = skb->tail - b;
 521         nfnetlink_send(skb, 0, group, 0);
 522         return NOTIFY_DONE;
 523
 524 nlmsg_failure:
 525 nla_put_failure:
 526         kfree_skb(skb);
 527         return NOTIFY_DONE;
 528 }
 529 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 530
 531 static int ctnetlink_done(struct netlink_callback *cb)
 532 {
 533         if (cb->args[1])
 534                 nf_ct_put((struct nf_conn *)cb->args[1]);
 535         return 0;
 536 }
 537
 538 #define L3PROTO(ct) (ct)->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
 539
 540 static int
 541 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 542 {
 543         struct nf_conn *ct, *last;
 544         struct nf_conntrack_tuple_hash *h;
 545         struct hlist_node *n;
 546         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 547         u_int8_t l3proto = nfmsg->nfgen_family;
 548
 549         rcu_read_lock();
 550         last = (struct nf_conn *)cb->args[1];
 551         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 552 restart:
 553                 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
 554                                          hnode) {
 555                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 556                                 continue;
 557                         ct = nf_ct_tuplehash_to_ctrack(h);
 558                         /* Dump entries of a given L3 protocol number.
 559                          * If it is not specified, ie. l3proto == 0,
 560                          * then dump everything. */
 561                         if (l3proto && L3PROTO(ct) != l3proto)
 562                                 continue;
 563                         if (cb->args[1]) {
 564                                 if (ct != last)
 565                                         continue;
 566                                 cb->args[1] = 0;
 567                         }
 568                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 569                                                 cb->nlh->nlmsg_seq,
 570                                                 IPCTNL_MSG_CT_NEW,
 571                                                 1, ct) < 0) {
 572                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
 573                                         continue;
 574                                 cb->args[1] = (unsigned long)ct;
 575                                 goto out;
 576                         }
 577 #ifdef CONFIG_NF_CT_ACCT
 578                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 579                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 580                                 memset(&ct->counters, 0, sizeof(ct->counters));
 581 #endif
 582                 }
 583                 if (cb->args[1]) {
 584                         cb->args[1] = 0;
 585                         goto restart;
 586                 }
 587         }
 588 out:
 589         rcu_read_unlock();
 590         if (last)
 591                 nf_ct_put(last);
 592
 593         return skb->len;
 594 }
 595
 596 static inline int
 597 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 598 {
 599         struct nlattr *tb[CTA_IP_MAX+1];
 600         struct nf_conntrack_l3proto *l3proto;
 601         int ret = 0;
 602
 603         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 604
 605         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 606
 607         if (likely(l3proto->nlattr_to_tuple)) {
 608                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 609                                           l3proto->nla_policy);
 610                 if (ret == 0)
 611                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 612         }
 613
 614         nf_ct_l3proto_put(l3proto);
 615
 616         return ret;
 617 }
 618
 619 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 620         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 621 };
 622
 623 static inline int
 624 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 625                             struct nf_conntrack_tuple *tuple)
 626 {
 627         struct nlattr *tb[CTA_PROTO_MAX+1];
 628         struct nf_conntrack_l4proto *l4proto;
 629         int ret = 0;
 630
 631         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 632         if (ret < 0)
 633                 return ret;
 634
 635         if (!tb[CTA_PROTO_NUM])
 636                 return -EINVAL;
 637         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 638
 639         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 640
 641         if (likely(l4proto->nlattr_to_tuple)) {
 642                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 643                                           l4proto->nla_policy);
 644                 if (ret == 0)
 645                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 646         }
 647
 648         nf_ct_l4proto_put(l4proto);
 649
 650         return ret;
 651 }
 652
 653 static int
 654 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 655                       enum ctattr_tuple type, u_int8_t l3num)
 656 {
 657         struct nlattr *tb[CTA_TUPLE_MAX+1];
 658         int err;
 659
 660         memset(tuple, 0, sizeof(*tuple));
 661
 662         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 663
 664         if (!tb[CTA_TUPLE_IP])
 665                 return -EINVAL;
 666
 667         tuple->src.l3num = l3num;
 668
 669         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 670         if (err < 0)
 671                 return err;
 672
 673         if (!tb[CTA_TUPLE_PROTO])
 674                 return -EINVAL;
 675
 676         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 677         if (err < 0)
 678                 return err;
 679
 680         /* orig and expect tuples get DIR_ORIGINAL */
 681         if (type == CTA_TUPLE_REPLY)
 682                 tuple->dst.dir = IP_CT_DIR_REPLY;
 683         else
 684                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 685
 686         return 0;
 687 }
 688
 689 #ifdef CONFIG_NF_NAT_NEEDED
 690 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
 691         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
 692         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
 693 };
 694
 695 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 696                                      const struct nf_conn *ct,
 697                                      struct nf_nat_range *range)
 698 {
 699         struct nlattr *tb[CTA_PROTONAT_MAX+1];
 700         const struct nf_nat_protocol *npt;
 701         int err;
 702
 703         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
 704         if (err < 0)
 705                 return err;
 706
 707         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 708
 709         if (!npt->nlattr_to_range) {
 710                 nf_nat_proto_put(npt);
 711                 return 0;
 712         }
 713
 714         /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
 715         if (npt->nlattr_to_range(tb, range) > 0)
 716                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
 717
 718         nf_nat_proto_put(npt);
 719
 720         return 0;
 721 }
 722
 723 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
 724         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
 725         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
 726 };
 727
 728 static inline int
 729 nfnetlink_parse_nat(struct nlattr *nat,
 730                     const struct nf_conn *ct, struct nf_nat_range *range)
 731 {
 732         struct nlattr *tb[CTA_NAT_MAX+1];
 733         int err;
 734
 735         memset(range, 0, sizeof(*range));
 736
 737         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
 738         if (err < 0)
 739                 return err;
 740
 741         if (tb[CTA_NAT_MINIP])
 742                 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
 743
 744         if (!tb[CTA_NAT_MAXIP])
 745                 range->max_ip = range->min_ip;
 746         else
 747                 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
 748
 749         if (range->min_ip)
 750                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 751
 752         if (!tb[CTA_NAT_PROTO])
 753                 return 0;
 754
 755         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
 756         if (err < 0)
 757                 return err;
 758
 759         return 0;
 760 }
 761 #endif
 762
 763 static inline int
 764 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 765 {
 766         struct nlattr *tb[CTA_HELP_MAX+1];
 767
 768         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 769
 770         if (!tb[CTA_HELP_NAME])
 771                 return -EINVAL;
 772
 773         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 774
 775         return 0;
 776 }
 777
 778 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 779         [CTA_STATUS]            = { .type = NLA_U32 },
 780         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 781         [CTA_MARK]              = { .type = NLA_U32 },
 782         [CTA_USE]               = { .type = NLA_U32 },
 783         [CTA_ID]                = { .type = NLA_U32 },
 784 };
 785
 786 static int
 787 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 788                         struct nlmsghdr *nlh, struct nlattr *cda[])
 789 {
 790         struct nf_conntrack_tuple_hash *h;
 791         struct nf_conntrack_tuple tuple;
 792         struct nf_conn *ct;
 793         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 794         u_int8_t u3 = nfmsg->nfgen_family;
 795         int err = 0;
 796
 797         if (cda[CTA_TUPLE_ORIG])
 798                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 799         else if (cda[CTA_TUPLE_REPLY])
 800                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 801         else {
 802                 /* Flush the whole table */
 803                 nf_conntrack_flush();
 804                 return 0;
 805         }
 806
 807         if (err < 0)
 808                 return err;
 809
 810         h = nf_conntrack_find_get(&tuple);
 811         if (!h)
 812                 return -ENOENT;
 813
 814         ct = nf_ct_tuplehash_to_ctrack(h);
 815
 816         if (cda[CTA_ID]) {
 817                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 818                 if (id != (u32)(unsigned long)ct) {
 819                         nf_ct_put(ct);
 820                         return -ENOENT;
 821                 }
 822         }
 823         if (del_timer(&ct->timeout))
 824                 ct->timeout.function((unsigned long)ct);
 825
 826         nf_ct_put(ct);
 827
 828         return 0;
 829 }
 830
 831 static int
 832 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 833                         struct nlmsghdr *nlh, struct nlattr *cda[])
 834 {
 835         struct nf_conntrack_tuple_hash *h;
 836         struct nf_conntrack_tuple tuple;
 837         struct nf_conn *ct;
 838         struct sk_buff *skb2 = NULL;
 839         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 840         u_int8_t u3 = nfmsg->nfgen_family;
 841         int err = 0;
 842
 843         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 844 #ifndef CONFIG_NF_CT_ACCT
 845                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 846                         return -ENOTSUPP;
 847 #endif
 848                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 849                                           ctnetlink_done);
 850         }
 851
 852         if (cda[CTA_TUPLE_ORIG])
 853                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 854         else if (cda[CTA_TUPLE_REPLY])
 855                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 856         else
 857                 return -EINVAL;
 858
 859         if (err < 0)
 860                 return err;
 861
 862         h = nf_conntrack_find_get(&tuple);
 863         if (!h)
 864                 return -ENOENT;
 865
 866         ct = nf_ct_tuplehash_to_ctrack(h);
 867
 868         err = -ENOMEM;
 869         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 870         if (!skb2) {
 871                 nf_ct_put(ct);
 872                 return -ENOMEM;
 873         }
 874
 875         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 876                                   IPCTNL_MSG_CT_NEW, 1, ct);
 877         nf_ct_put(ct);
 878         if (err <= 0)
 879                 goto free;
 880
 881         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 882         if (err < 0)
 883                 goto out;
 884
 885         return 0;
 886
 887 free:
 888         kfree_skb(skb2);
 889 out:
 890         return err;
 891 }
 892
 893 static int
 894 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 895 {
 896         unsigned long d;
 897         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 898         d = ct->status ^ status;
 899
 900         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 901                 /* unchangeable */
 902                 return -EINVAL;
 903
 904         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 905                 /* SEEN_REPLY bit can only be set */
 906                 return -EINVAL;
 907
 908
 909         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 910                 /* ASSURED bit can only be set */
 911                 return -EINVAL;
 912
 913         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 914 #ifndef CONFIG_NF_NAT_NEEDED
 915                 return -EINVAL;
 916 #else
 917                 struct nf_nat_range range;
 918
 919                 if (cda[CTA_NAT_DST]) {
 920                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 921                                                 &range) < 0)
 922                                 return -EINVAL;
 923                         if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
 924                                 return -EEXIST;
 925                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
 926                 }
 927                 if (cda[CTA_NAT_SRC]) {
 928                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 929                                                 &range) < 0)
 930                                 return -EINVAL;
 931                         if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
 932                                 return -EEXIST;
 933                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
 934                 }
 935 #endif
 936         }
 937
 938         /* Be careful here, modifying NAT bits can screw up things,
 939          * so don't let users modify them directly if they don't pass
 940          * nf_nat_range. */
 941         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 942         return 0;
 943 }
 944
 945
 946 static inline int
 947 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 948 {
 949         struct nf_conntrack_helper *helper;
 950         struct nf_conn_help *help = nfct_help(ct);
 951         char *helpname;
 952         int err;
 953
 954         /* don't change helper of sibling connections */
 955         if (ct->master)
 956                 return -EINVAL;
 957
 958         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 959         if (err < 0)
 960                 return err;
 961
 962         if (!strcmp(helpname, "")) {
 963                 if (help && help->helper) {
 964                         /* we had a helper before ... */
 965                         nf_ct_remove_expectations(ct);
 966                         rcu_assign_pointer(help->helper, NULL);
 967                 }
 968
 969                 return 0;
 970         }
 971
 972         helper = __nf_conntrack_helper_find_byname(helpname);
 973         if (helper == NULL)
 974                 return -EINVAL;
 975
 976         if (help) {
 977                 if (help->helper == helper)
 978                         return 0;
 979                 if (help->helper)
 980                         return -EBUSY;
 981                 /* need to zero data of old helper */
 982                 memset(&help->help, 0, sizeof(help->help));
 983         } else {
 984                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 985                 if (help == NULL)
 986                         return -ENOMEM;
 987         }
 988
 989         rcu_assign_pointer(help->helper, helper);
 990
 991         return 0;
 992 }
 993
 994 static inline int
 995 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 996 {
 997         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 998
 999         if (!del_timer(&ct->timeout))
1000                 return -ETIME;
1001
1002         ct->timeout.expires = jiffies + timeout * HZ;
1003         add_timer(&ct->timeout);
1004
1005         return 0;
1006 }
1007
1008 static inline int
1009 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1010 {
1011         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1012         struct nf_conntrack_l4proto *l4proto;
1013         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1014         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1015         int err = 0;
1016
1017         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1018
1019         l4proto = nf_ct_l4proto_find_get(l3num, npt);
1020
1021         if (l4proto->from_nlattr)
1022                 err = l4proto->from_nlattr(tb, ct);
1023         nf_ct_l4proto_put(l4proto);
1024
1025         return err;
1026 }
1027
1028 #ifdef CONFIG_NF_NAT_NEEDED
1029 static inline int
1030 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1031 {
1032         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1033
1034         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1035
1036         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1037                 return -EINVAL;
1038
1039         natseq->correction_pos =
1040                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1041
1042         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1043                 return -EINVAL;
1044
1045         natseq->offset_before =
1046                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1047
1048         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1049                 return -EINVAL;
1050
1051         natseq->offset_after =
1052                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1053
1054         return 0;
1055 }
1056
1057 static int
1058 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1059 {
1060         int ret = 0;
1061         struct nf_conn_nat *nat = nfct_nat(ct);
1062
1063         if (!nat)
1064                 return 0;
1065
1066         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1067                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1068                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1069                 if (ret < 0)
1070                         return ret;
1071
1072                 ct->status |= IPS_SEQ_ADJUST;
1073         }
1074
1075         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1076                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1077                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1078                 if (ret < 0)
1079                         return ret;
1080
1081                 ct->status |= IPS_SEQ_ADJUST;
1082         }
1083
1084         return 0;
1085 }
1086 #endif
1087
1088 static int
1089 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1090 {
1091         int err;
1092
1093         if (cda[CTA_HELP]) {
1094                 err = ctnetlink_change_helper(ct, cda);
1095                 if (err < 0)
1096                         return err;
1097         }
1098
1099         if (cda[CTA_TIMEOUT]) {
1100                 err = ctnetlink_change_timeout(ct, cda);
1101                 if (err < 0)
1102                         return err;
1103         }
1104
1105         if (cda[CTA_STATUS]) {
1106                 err = ctnetlink_change_status(ct, cda);
1107                 if (err < 0)
1108                         return err;
1109         }
1110
1111         if (cda[CTA_PROTOINFO]) {
1112                 err = ctnetlink_change_protoinfo(ct, cda);
1113                 if (err < 0)
1114                         return err;
1115         }
1116
1117 #if defined(CONFIG_NF_CONNTRACK_MARK)
1118         if (cda[CTA_MARK])
1119                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1120 #endif
1121
1122 #ifdef CONFIG_NF_NAT_NEEDED
1123         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1124                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1125                 if (err < 0)
1126                         return err;
1127         }
1128 #endif
1129
1130         return 0;
1131 }
1132
1133 static int
1134 ctnetlink_create_conntrack(struct nlattr *cda[],
1135                            struct nf_conntrack_tuple *otuple,
1136                            struct nf_conntrack_tuple *rtuple,
1137                            struct nf_conn *master_ct)
1138 {
1139         struct nf_conn *ct;
1140         int err = -EINVAL;
1141         struct nf_conn_help *help;
1142         struct nf_conntrack_helper *helper;
1143
1144         ct = nf_conntrack_alloc(otuple, rtuple);
1145         if (ct == NULL || IS_ERR(ct))
1146                 return -ENOMEM;
1147
1148         if (!cda[CTA_TIMEOUT])
1149                 goto err;
1150         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1151
1152         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1153         ct->status |= IPS_CONFIRMED;
1154
1155         if (cda[CTA_STATUS]) {
1156                 err = ctnetlink_change_status(ct, cda);
1157                 if (err < 0)
1158                         goto err;
1159         }
1160
1161         if (cda[CTA_PROTOINFO]) {
1162                 err = ctnetlink_change_protoinfo(ct, cda);
1163                 if (err < 0)
1164                         goto err;
1165         }
1166
1167 #if defined(CONFIG_NF_CONNTRACK_MARK)
1168         if (cda[CTA_MARK])
1169                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1170 #endif
1171
1172         rcu_read_lock();
1173         helper = __nf_ct_helper_find(rtuple);
1174         if (helper) {
1175                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1176                 if (help == NULL) {
1177                         rcu_read_unlock();
1178                         err = -ENOMEM;
1179                         goto err;
1180                 }
1181                 /* not in hash table yet so not strictly necessary */
1182                 rcu_assign_pointer(help->helper, helper);
1183         }
1184
1185         /* setup master conntrack: this is a confirmed expectation */
1186         if (master_ct) {
1187                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1188                 ct->master = master_ct;
1189         }
1190
1191         add_timer(&ct->timeout);
1192         nf_conntrack_hash_insert(ct);
1193         rcu_read_unlock();
1194
1195         return 0;
1196
1197 err:
1198         nf_conntrack_free(ct);
1199         return err;
1200 }
1201
1202 static int
1203 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1204                         struct nlmsghdr *nlh, struct nlattr *cda[])
1205 {
1206         struct nf_conntrack_tuple otuple, rtuple;
1207         struct nf_conntrack_tuple_hash *h = NULL;
1208         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1209         u_int8_t u3 = nfmsg->nfgen_family;
1210         int err = 0;
1211
1212         if (cda[CTA_TUPLE_ORIG]) {
1213                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1214                 if (err < 0)
1215                         return err;
1216         }
1217
1218         if (cda[CTA_TUPLE_REPLY]) {
1219                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1220                 if (err < 0)
1221                         return err;
1222         }
1223
1224         spin_lock_bh(&nf_conntrack_lock);
1225         if (cda[CTA_TUPLE_ORIG])
1226                 h = __nf_conntrack_find(&otuple);
1227         else if (cda[CTA_TUPLE_REPLY])
1228                 h = __nf_conntrack_find(&rtuple);
1229
1230         if (h == NULL) {
1231                 struct nf_conntrack_tuple master;
1232                 struct nf_conntrack_tuple_hash *master_h = NULL;
1233                 struct nf_conn *master_ct = NULL;
1234
1235                 if (cda[CTA_TUPLE_MASTER]) {
1236                         err = ctnetlink_parse_tuple(cda,
1237                                                     &master,
1238                                                     CTA_TUPLE_MASTER,
1239                                                     u3);
1240                         if (err < 0)
1241                                 goto out_unlock;
1242
1243                         master_h = __nf_conntrack_find(&master);
1244                         if (master_h == NULL) {
1245                                 err = -ENOENT;
1246                                 goto out_unlock;
1247                         }
1248                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1249                         atomic_inc(&master_ct->ct_general.use);
1250                 }
1251
1252                 spin_unlock_bh(&nf_conntrack_lock);
1253                 err = -ENOENT;
1254                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1255                         err = ctnetlink_create_conntrack(cda,
1256                                                          &otuple,
1257                                                          &rtuple,
1258                                                          master_ct);
1259                 if (err < 0 && master_ct)
1260                         nf_ct_put(master_ct);
1261
1262                 return err;
1263         }
1264         /* implicit 'else' */
1265
1266         /* We manipulate the conntrack inside the global conntrack table lock,
1267          * so there's no need to increase the refcount */
1268         err = -EEXIST;
1269         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1270                 /* we only allow nat config for new conntracks */
1271                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1272                         err = -EINVAL;
1273                         goto out_unlock;
1274                 }
1275                 /* can't link an existing conntrack to a master */
1276                 if (cda[CTA_TUPLE_MASTER]) {
1277                         err = -EINVAL;
1278                         goto out_unlock;
1279                 }
1280                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1281                                                  cda);
1282         }
1283
1284 out_unlock:
1285         spin_unlock_bh(&nf_conntrack_lock);
1286         return err;
1287 }
1288
1289 /***********************************************************************
1290  * EXPECT
1291  ***********************************************************************/
1292
1293 static inline int
1294 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1295                          const struct nf_conntrack_tuple *tuple,
1296                          enum ctattr_expect type)
1297 {
1298         struct nlattr *nest_parms;
1299
1300         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1301         if (!nest_parms)
1302                 goto nla_put_failure;
1303         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1304                 goto nla_put_failure;
1305         nla_nest_end(skb, nest_parms);
1306
1307         return 0;
1308
1309 nla_put_failure:
1310         return -1;
1311 }
1312
1313 static inline int
1314 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1315                         const struct nf_conntrack_tuple *tuple,
1316                         const struct nf_conntrack_tuple_mask *mask)
1317 {
1318         int ret;
1319         struct nf_conntrack_l3proto *l3proto;
1320         struct nf_conntrack_l4proto *l4proto;
1321         struct nf_conntrack_tuple m;
1322         struct nlattr *nest_parms;
1323
1324         memset(&m, 0xFF, sizeof(m));
1325         m.src.u.all = mask->src.u.all;
1326         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1327
1328         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1329         if (!nest_parms)
1330                 goto nla_put_failure;
1331
1332         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1333         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1334         nf_ct_l3proto_put(l3proto);
1335
1336         if (unlikely(ret < 0))
1337                 goto nla_put_failure;
1338
1339         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1340         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1341         nf_ct_l4proto_put(l4proto);
1342         if (unlikely(ret < 0))
1343                 goto nla_put_failure;
1344
1345         nla_nest_end(skb, nest_parms);
1346
1347         return 0;
1348
1349 nla_put_failure:
1350         return -1;
1351 }
1352
1353 static int
1354 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1355                           const struct nf_conntrack_expect *exp)
1356 {
1357         struct nf_conn *master = exp->master;
1358         long timeout = (exp->timeout.expires - jiffies) / HZ;
1359
1360         if (timeout < 0)
1361                 timeout = 0;
1362
1363         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1364                 goto nla_put_failure;
1365         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1366                 goto nla_put_failure;
1367         if (ctnetlink_exp_dump_tuple(skb,
1368                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1369                                  CTA_EXPECT_MASTER) < 0)
1370                 goto nla_put_failure;
1371
1372         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1373         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1374
1375         return 0;
1376
1377 nla_put_failure:
1378         return -1;
1379 }
1380
1381 static int
1382 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1383                     int event,
1384                     int nowait,
1385                     const struct nf_conntrack_expect *exp)
1386 {
1387         struct nlmsghdr *nlh;
1388         struct nfgenmsg *nfmsg;
1389         unsigned char *b = skb_tail_pointer(skb);
1390
1391         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1392         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1393         nfmsg  = NLMSG_DATA(nlh);
1394
1395         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1396         nfmsg->nfgen_family = exp->tuple.src.l3num;
1397         nfmsg->version      = NFNETLINK_V0;
1398         nfmsg->res_id       = 0;
1399
1400         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1401                 goto nla_put_failure;
1402
1403         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1404         return skb->len;
1405
1406 nlmsg_failure:
1407 nla_put_failure:
1408         nlmsg_trim(skb, b);
1409         return -1;
1410 }
1411
1412 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1413 static int ctnetlink_expect_event(struct notifier_block *this,
1414                                   unsigned long events, void *ptr)
1415 {
1416         struct nlmsghdr *nlh;
1417         struct nfgenmsg *nfmsg;
1418         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1419         struct sk_buff *skb;
1420         unsigned int type;
1421         sk_buff_data_t b;
1422         int flags = 0;
1423
1424         if (events & IPEXP_NEW) {
1425                 type = IPCTNL_MSG_EXP_NEW;
1426                 flags = NLM_F_CREATE|NLM_F_EXCL;
1427         } else
1428                 return NOTIFY_DONE;
1429
1430         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1431                 return NOTIFY_DONE;
1432
1433         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1434         if (!skb)
1435                 return NOTIFY_DONE;
1436
1437         b = skb->tail;
1438
1439         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1440         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1441         nfmsg = NLMSG_DATA(nlh);
1442
1443         nlh->nlmsg_flags    = flags;
1444         nfmsg->nfgen_family = exp->tuple.src.l3num;
1445         nfmsg->version      = NFNETLINK_V0;
1446         nfmsg->res_id       = 0;
1447
1448         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1449                 goto nla_put_failure;
1450
1451         nlh->nlmsg_len = skb->tail - b;
1452         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1453         return NOTIFY_DONE;
1454
1455 nlmsg_failure:
1456 nla_put_failure:
1457         kfree_skb(skb);
1458         return NOTIFY_DONE;
1459 }
1460 #endif
1461 static int ctnetlink_exp_done(struct netlink_callback *cb)
1462 {
1463         if (cb->args[1])
1464                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1465         return 0;
1466 }
1467
1468 static int
1469 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1470 {
1471         struct nf_conntrack_expect *exp, *last;
1472         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1473         struct hlist_node *n;
1474         u_int8_t l3proto = nfmsg->nfgen_family;
1475
1476         rcu_read_lock();
1477         last = (struct nf_conntrack_expect *)cb->args[1];
1478         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1479 restart:
1480                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1481                                      hnode) {
1482                         if (l3proto && exp->tuple.src.l3num != l3proto)
1483                                 continue;
1484                         if (cb->args[1]) {
1485                                 if (exp != last)
1486                                         continue;
1487                                 cb->args[1] = 0;
1488                         }
1489                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1490                                                     cb->nlh->nlmsg_seq,
1491                                                     IPCTNL_MSG_EXP_NEW,
1492                                                     1, exp) < 0) {
1493                                 if (!atomic_inc_not_zero(&exp->use))
1494                                         continue;
1495                                 cb->args[1] = (unsigned long)exp;
1496                                 goto out;
1497                         }
1498                 }
1499                 if (cb->args[1]) {
1500                         cb->args[1] = 0;
1501                         goto restart;
1502                 }
1503         }
1504 out:
1505         rcu_read_unlock();
1506         if (last)
1507                 nf_ct_expect_put(last);
1508
1509         return skb->len;
1510 }
1511
1512 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1513         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1514         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1515 };
1516
1517 static int
1518 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1519                      struct nlmsghdr *nlh, struct nlattr *cda[])
1520 {
1521         struct nf_conntrack_tuple tuple;
1522         struct nf_conntrack_expect *exp;
1523         struct sk_buff *skb2;
1524         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1525         u_int8_t u3 = nfmsg->nfgen_family;
1526         int err = 0;
1527
1528         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1529                 return netlink_dump_start(ctnl, skb, nlh,
1530                                           ctnetlink_exp_dump_table,
1531                                           ctnetlink_exp_done);
1532         }
1533
1534         if (cda[CTA_EXPECT_MASTER])
1535                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1536         else
1537                 return -EINVAL;
1538
1539         if (err < 0)
1540                 return err;
1541
1542         exp = nf_ct_expect_find_get(&tuple);
1543         if (!exp)
1544                 return -ENOENT;
1545
1546         if (cda[CTA_EXPECT_ID]) {
1547                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1548                 if (ntohl(id) != (u32)(unsigned long)exp) {
1549                         nf_ct_expect_put(exp);
1550                         return -ENOENT;
1551                 }
1552         }
1553
1554         err = -ENOMEM;
1555         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1556         if (!skb2)
1557                 goto out;
1558
1559         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1560                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1561                                       1, exp);
1562         if (err <= 0)
1563                 goto free;
1564
1565         nf_ct_expect_put(exp);
1566
1567         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1568
1569 free:
1570         kfree_skb(skb2);
1571 out:
1572         nf_ct_expect_put(exp);
1573         return err;
1574 }
1575
1576 static int
1577 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1578                      struct nlmsghdr *nlh, struct nlattr *cda[])
1579 {
1580         struct nf_conntrack_expect *exp;
1581         struct nf_conntrack_tuple tuple;
1582         struct nf_conntrack_helper *h;
1583         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1584         struct hlist_node *n, *next;
1585         u_int8_t u3 = nfmsg->nfgen_family;
1586         unsigned int i;
1587         int err;
1588
1589         if (cda[CTA_EXPECT_TUPLE]) {
1590                 /* delete a single expect by tuple */
1591                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1592                 if (err < 0)
1593                         return err;
1594
1595                 /* bump usage count to 2 */
1596                 exp = nf_ct_expect_find_get(&tuple);
1597                 if (!exp)
1598                         return -ENOENT;
1599
1600                 if (cda[CTA_EXPECT_ID]) {
1601                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1602                         if (ntohl(id) != (u32)(unsigned long)exp) {
1603                                 nf_ct_expect_put(exp);
1604                                 return -ENOENT;
1605                         }
1606                 }
1607
1608                 /* after list removal, usage count == 1 */
1609                 nf_ct_unexpect_related(exp);
1610                 /* have to put what we 'get' above.
1611                  * after this line usage count == 0 */
1612                 nf_ct_expect_put(exp);
1613         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1614                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1615                 struct nf_conn_help *m_help;
1616
1617                 /* delete all expectations for this helper */
1618                 spin_lock_bh(&nf_conntrack_lock);
1619                 h = __nf_conntrack_helper_find_byname(name);
1620                 if (!h) {
1621                         spin_unlock_bh(&nf_conntrack_lock);
1622                         return -EINVAL;
1623                 }
1624                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1625                         hlist_for_each_entry_safe(exp, n, next,
1626                                                   &nf_ct_expect_hash[i],
1627                                                   hnode) {
1628                                 m_help = nfct_help(exp->master);
1629                                 if (m_help->helper == h
1630                                     && del_timer(&exp->timeout)) {
1631                                         nf_ct_unlink_expect(exp);
1632                                         nf_ct_expect_put(exp);
1633                                 }
1634                         }
1635                 }
1636                 spin_unlock_bh(&nf_conntrack_lock);
1637         } else {
1638                 /* This basically means we have to flush everything*/
1639                 spin_lock_bh(&nf_conntrack_lock);
1640                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1641                         hlist_for_each_entry_safe(exp, n, next,
1642                                                   &nf_ct_expect_hash[i],
1643                                                   hnode) {
1644                                 if (del_timer(&exp->timeout)) {
1645                                         nf_ct_unlink_expect(exp);
1646                                         nf_ct_expect_put(exp);
1647                                 }
1648                         }
1649                 }
1650                 spin_unlock_bh(&nf_conntrack_lock);
1651         }
1652
1653         return 0;
1654 }
1655 static int
1656 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1657 {
1658         return -EOPNOTSUPP;
1659 }
1660
1661 static int
1662 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1663 {
1664         struct nf_conntrack_tuple tuple, mask, master_tuple;
1665         struct nf_conntrack_tuple_hash *h = NULL;
1666         struct nf_conntrack_expect *exp;
1667         struct nf_conn *ct;
1668         struct nf_conn_help *help;
1669         int err = 0;
1670
1671         /* caller guarantees that those three CTA_EXPECT_* exist */
1672         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1673         if (err < 0)
1674                 return err;
1675         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1676         if (err < 0)
1677                 return err;
1678         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1679         if (err < 0)
1680                 return err;
1681
1682         /* Look for master conntrack of this expectation */
1683         h = nf_conntrack_find_get(&master_tuple);
1684         if (!h)
1685                 return -ENOENT;
1686         ct = nf_ct_tuplehash_to_ctrack(h);
1687         help = nfct_help(ct);
1688
1689         if (!help || !help->helper) {
1690                 /* such conntrack hasn't got any helper, abort */
1691                 err = -EINVAL;
1692                 goto out;
1693         }
1694
1695         exp = nf_ct_expect_alloc(ct);
1696         if (!exp) {
1697                 err = -ENOMEM;
1698                 goto out;
1699         }
1700
1701         exp->expectfn = NULL;
1702         exp->flags = 0;
1703         exp->master = ct;
1704         exp->helper = NULL;
1705         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1706         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1707         exp->mask.src.u.all = mask.src.u.all;
1708
1709         err = nf_ct_expect_related(exp);
1710         nf_ct_expect_put(exp);
1711
1712 out:
1713         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1714         return err;
1715 }
1716
1717 static int
1718 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1719                      struct nlmsghdr *nlh, struct nlattr *cda[])
1720 {
1721         struct nf_conntrack_tuple tuple;
1722         struct nf_conntrack_expect *exp;
1723         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1724         u_int8_t u3 = nfmsg->nfgen_family;
1725         int err = 0;
1726
1727         if (!cda[CTA_EXPECT_TUPLE]
1728             || !cda[CTA_EXPECT_MASK]
1729             || !cda[CTA_EXPECT_MASTER])
1730                 return -EINVAL;
1731
1732         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1733         if (err < 0)
1734                 return err;
1735
1736         spin_lock_bh(&nf_conntrack_lock);
1737         exp = __nf_ct_expect_find(&tuple);
1738
1739         if (!exp) {
1740                 spin_unlock_bh(&nf_conntrack_lock);
1741                 err = -ENOENT;
1742                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1743                         err = ctnetlink_create_expect(cda, u3);
1744                 return err;
1745         }
1746
1747         err = -EEXIST;
1748         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1749                 err = ctnetlink_change_expect(exp, cda);
1750         spin_unlock_bh(&nf_conntrack_lock);
1751
1752         return err;
1753 }
1754
1755 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1756 static struct notifier_block ctnl_notifier = {
1757         .notifier_call  = ctnetlink_conntrack_event,
1758 };
1759
1760 static struct notifier_block ctnl_notifier_exp = {
1761         .notifier_call  = ctnetlink_expect_event,
1762 };
1763 #endif
1764
1765 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1766         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1767                                             .attr_count = CTA_MAX,
1768                                             .policy = ct_nla_policy },
1769         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1770                                             .attr_count = CTA_MAX,
1771                                             .policy = ct_nla_policy },
1772         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1773                                             .attr_count = CTA_MAX,
1774                                             .policy = ct_nla_policy },
1775         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1776                                             .attr_count = CTA_MAX,
1777                                             .policy = ct_nla_policy },
1778 };
1779
1780 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1781         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1782                                             .attr_count = CTA_EXPECT_MAX,
1783                                             .policy = exp_nla_policy },
1784         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1785                                             .attr_count = CTA_EXPECT_MAX,
1786                                             .policy = exp_nla_policy },
1787         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1788                                             .attr_count = CTA_EXPECT_MAX,
1789                                             .policy = exp_nla_policy },
1790 };
1791
1792 static const struct nfnetlink_subsystem ctnl_subsys = {
1793         .name                           = "conntrack",
1794         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1795         .cb_count                       = IPCTNL_MSG_MAX,
1796         .cb                             = ctnl_cb,
1797 };
1798
1799 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1800         .name                           = "conntrack_expect",
1801         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1802         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1803         .cb                             = ctnl_exp_cb,
1804 };
1805
1806 MODULE_ALIAS("ip_conntrack_netlink");
1807 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1808 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1809
1810 static int __init ctnetlink_init(void)
1811 {
1812         int ret;
1813
1814         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1815         ret = nfnetlink_subsys_register(&ctnl_subsys);
1816         if (ret < 0) {
1817                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1818                 goto err_out;
1819         }
1820
1821         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1822         if (ret < 0) {
1823                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1824                 goto err_unreg_subsys;
1825         }
1826
1827 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1828         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1829         if (ret < 0) {
1830                 printk("ctnetlink_init: cannot register notifier.\n");
1831                 goto err_unreg_exp_subsys;
1832         }
1833
1834         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1835         if (ret < 0) {
1836                 printk("ctnetlink_init: cannot expect register notifier.\n");
1837                 goto err_unreg_notifier;
1838         }
1839 #endif
1840
1841         return 0;
1842
1843 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1844 err_unreg_notifier:
1845         nf_conntrack_unregister_notifier(&ctnl_notifier);
1846 err_unreg_exp_subsys:
1847         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1848 #endif
1849 err_unreg_subsys:
1850         nfnetlink_subsys_unregister(&ctnl_subsys);
1851 err_out:
1852         return ret;
1853 }
1854
1855 static void __exit ctnetlink_exit(void)
1856 {
1857         printk("ctnetlink: unregistering from nfnetlink.\n");
1858
1859 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1860         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1861         nf_conntrack_unregister_notifier(&ctnl_notifier);
1862 #endif
1863
1864         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1865         nfnetlink_subsys_unregister(&ctnl_subsys);
1866         return;
1867 }
1868
1869 module_init(ctnetlink_init);
1870 module_exit(ctnetlink_exit);