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) 2005-2008 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;
 149         struct nlattr *nest_proto;
 150         int ret;
 151
 152         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
 153         if (!l4proto->to_nlattr) {
 154                 nf_ct_l4proto_put(l4proto);
 155                 return 0;
 156         }
 157
 158         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 159         if (!nest_proto)
 160                 goto nla_put_failure;
 161
 162         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 163
 164         nf_ct_l4proto_put(l4proto);
 165
 166         nla_nest_end(skb, nest_proto);
 167
 168         return ret;
 169
 170 nla_put_failure:
 171         nf_ct_l4proto_put(l4proto);
 172         return -1;
 173 }
 174
 175 static inline int
 176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 177 {
 178         struct nlattr *nest_helper;
 179         const struct nf_conn_help *help = nfct_help(ct);
 180         struct nf_conntrack_helper *helper;
 181
 182         if (!help)
 183                 return 0;
 184
 185         rcu_read_lock();
 186         helper = rcu_dereference(help->helper);
 187         if (!helper)
 188                 goto out;
 189
 190         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 191         if (!nest_helper)
 192                 goto nla_put_failure;
 193         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 194
 195         if (helper->to_nlattr)
 196                 helper->to_nlattr(skb, ct);
 197
 198         nla_nest_end(skb, nest_helper);
 199 out:
 200         rcu_read_unlock();
 201         return 0;
 202
 203 nla_put_failure:
 204         rcu_read_unlock();
 205         return -1;
 206 }
 207
 208 #ifdef CONFIG_NF_CT_ACCT
 209 static int
 210 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 211                         enum ip_conntrack_dir dir)
 212 {
 213         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 214         struct nlattr *nest_count;
 215
 216         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 217         if (!nest_count)
 218                 goto nla_put_failure;
 219
 220         NLA_PUT_BE32(skb, CTA_COUNTERS32_PACKETS,
 221                      htonl(ct->counters[dir].packets));
 222         NLA_PUT_BE32(skb, CTA_COUNTERS32_BYTES,
 223                      htonl(ct->counters[dir].bytes));
 224
 225         nla_nest_end(skb, nest_count);
 226
 227         return 0;
 228
 229 nla_put_failure:
 230         return -1;
 231 }
 232 #else
 233 #define ctnetlink_dump_counters(a, b, c) (0)
 234 #endif
 235
 236 #ifdef CONFIG_NF_CONNTRACK_MARK
 237 static inline int
 238 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 239 {
 240         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 241         return 0;
 242
 243 nla_put_failure:
 244         return -1;
 245 }
 246 #else
 247 #define ctnetlink_dump_mark(a, b) (0)
 248 #endif
 249
 250 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 251 static inline int
 252 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 253 {
 254         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 255         return 0;
 256
 257 nla_put_failure:
 258         return -1;
 259 }
 260 #else
 261 #define ctnetlink_dump_secmark(a, b) (0)
 262 #endif
 263
 264 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 265
 266 static inline int
 267 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 268 {
 269         struct nlattr *nest_parms;
 270
 271         if (!(ct->status & IPS_EXPECTED))
 272                 return 0;
 273
 274         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 275         if (!nest_parms)
 276                 goto nla_put_failure;
 277         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 278                 goto nla_put_failure;
 279         nla_nest_end(skb, nest_parms);
 280
 281         return 0;
 282
 283 nla_put_failure:
 284         return -1;
 285 }
 286
 287 #ifdef CONFIG_NF_NAT_NEEDED
 288 static int
 289 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 290 {
 291         struct nlattr *nest_parms;
 292
 293         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 294         if (!nest_parms)
 295                 goto nla_put_failure;
 296
 297         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 298                      htonl(natseq->correction_pos));
 299         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 300                      htonl(natseq->offset_before));
 301         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 302                      htonl(natseq->offset_after));
 303
 304         nla_nest_end(skb, nest_parms);
 305
 306         return 0;
 307
 308 nla_put_failure:
 309         return -1;
 310 }
 311
 312 static inline int
 313 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 314 {
 315         struct nf_nat_seq *natseq;
 316         struct nf_conn_nat *nat = nfct_nat(ct);
 317
 318         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 319                 return 0;
 320
 321         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 322         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 323                 return -1;
 324
 325         natseq = &nat->seq[IP_CT_DIR_REPLY];
 326         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 327                 return -1;
 328
 329         return 0;
 330 }
 331 #else
 332 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 333 #endif
 334
 335 static inline int
 336 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 337 {
 338         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 339         return 0;
 340
 341 nla_put_failure:
 342         return -1;
 343 }
 344
 345 static inline int
 346 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 347 {
 348         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 349         return 0;
 350
 351 nla_put_failure:
 352         return -1;
 353 }
 354
 355 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 356
 357 static int
 358 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 359                     int event, int nowait,
 360                     const struct nf_conn *ct)
 361 {
 362         struct nlmsghdr *nlh;
 363         struct nfgenmsg *nfmsg;
 364         struct nlattr *nest_parms;
 365         unsigned char *b = skb_tail_pointer(skb);
 366
 367         event |= NFNL_SUBSYS_CTNETLINK << 8;
 368         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 369         nfmsg  = NLMSG_DATA(nlh);
 370
 371         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 372         nfmsg->nfgen_family = nf_ct_l3num(ct);
 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 = nf_ct_l3num(ct);
 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 (ctnetlink_dump_id(skb, ct) < 0)
 476                 goto nla_put_failure;
 477
 478         if (ctnetlink_dump_status(skb, ct) < 0)
 479                 goto nla_put_failure;
 480
 481         if (events & IPCT_DESTROY) {
 482                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 483                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 484                         goto nla_put_failure;
 485         } else {
 486                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 487                         goto nla_put_failure;
 488
 489                 if (events & IPCT_PROTOINFO
 490                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 491                         goto nla_put_failure;
 492
 493                 if ((events & IPCT_HELPER || nfct_help(ct))
 494                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 495                         goto nla_put_failure;
 496
 497 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 498                 if ((events & IPCT_SECMARK || ct->secmark)
 499                     && ctnetlink_dump_secmark(skb, ct) < 0)
 500                         goto nla_put_failure;
 501 #endif
 502
 503                 if (events & IPCT_COUNTER_FILLING &&
 504                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 505                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 506                         goto nla_put_failure;
 507
 508                 if (events & IPCT_RELATED &&
 509                     ctnetlink_dump_master(skb, ct) < 0)
 510                         goto nla_put_failure;
 511
 512                 if (events & IPCT_NATSEQADJ &&
 513                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 514                         goto nla_put_failure;
 515         }
 516
 517 #ifdef CONFIG_NF_CONNTRACK_MARK
 518         if ((events & IPCT_MARK || ct->mark)
 519             && ctnetlink_dump_mark(skb, ct) < 0)
 520                 goto nla_put_failure;
 521 #endif
 522
 523         nlh->nlmsg_len = skb->tail - b;
 524         nfnetlink_send(skb, 0, group, 0);
 525         return NOTIFY_DONE;
 526
 527 nlmsg_failure:
 528 nla_put_failure:
 529         kfree_skb(skb);
 530         return NOTIFY_DONE;
 531 }
 532 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 533
 534 static int ctnetlink_done(struct netlink_callback *cb)
 535 {
 536         if (cb->args[1])
 537                 nf_ct_put((struct nf_conn *)cb->args[1]);
 538         return 0;
 539 }
 540
 541 static int
 542 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 543 {
 544         struct nf_conn *ct, *last;
 545         struct nf_conntrack_tuple_hash *h;
 546         struct hlist_node *n;
 547         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 548         u_int8_t l3proto = nfmsg->nfgen_family;
 549
 550         rcu_read_lock();
 551         last = (struct nf_conn *)cb->args[1];
 552         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 553 restart:
 554                 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
 555                                          hnode) {
 556                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 557                                 continue;
 558                         ct = nf_ct_tuplehash_to_ctrack(h);
 559                         /* Dump entries of a given L3 protocol number.
 560                          * If it is not specified, ie. l3proto == 0,
 561                          * then dump everything. */
 562                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 563                                 continue;
 564                         if (cb->args[1]) {
 565                                 if (ct != last)
 566                                         continue;
 567                                 cb->args[1] = 0;
 568                         }
 569                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 570                                                 cb->nlh->nlmsg_seq,
 571                                                 IPCTNL_MSG_CT_NEW,
 572                                                 1, ct) < 0) {
 573                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
 574                                         continue;
 575                                 cb->args[1] = (unsigned long)ct;
 576                                 goto out;
 577                         }
 578 #ifdef CONFIG_NF_CT_ACCT
 579                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 580                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 581                                 memset(&ct->counters, 0, sizeof(ct->counters));
 582 #endif
 583                 }
 584                 if (cb->args[1]) {
 585                         cb->args[1] = 0;
 586                         goto restart;
 587                 }
 588         }
 589 out:
 590         rcu_read_unlock();
 591         if (last)
 592                 nf_ct_put(last);
 593
 594         return skb->len;
 595 }
 596
 597 static inline int
 598 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 599 {
 600         struct nlattr *tb[CTA_IP_MAX+1];
 601         struct nf_conntrack_l3proto *l3proto;
 602         int ret = 0;
 603
 604         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 605
 606         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 607
 608         if (likely(l3proto->nlattr_to_tuple)) {
 609                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 610                                           l3proto->nla_policy);
 611                 if (ret == 0)
 612                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 613         }
 614
 615         nf_ct_l3proto_put(l3proto);
 616
 617         return ret;
 618 }
 619
 620 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 621         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 622 };
 623
 624 static inline int
 625 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 626                             struct nf_conntrack_tuple *tuple)
 627 {
 628         struct nlattr *tb[CTA_PROTO_MAX+1];
 629         struct nf_conntrack_l4proto *l4proto;
 630         int ret = 0;
 631
 632         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 633         if (ret < 0)
 634                 return ret;
 635
 636         if (!tb[CTA_PROTO_NUM])
 637                 return -EINVAL;
 638         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 639
 640         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 641
 642         if (likely(l4proto->nlattr_to_tuple)) {
 643                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 644                                           l4proto->nla_policy);
 645                 if (ret == 0)
 646                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 647         }
 648
 649         nf_ct_l4proto_put(l4proto);
 650
 651         return ret;
 652 }
 653
 654 static int
 655 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 656                       enum ctattr_tuple type, u_int8_t l3num)
 657 {
 658         struct nlattr *tb[CTA_TUPLE_MAX+1];
 659         int err;
 660
 661         memset(tuple, 0, sizeof(*tuple));
 662
 663         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 664
 665         if (!tb[CTA_TUPLE_IP])
 666                 return -EINVAL;
 667
 668         tuple->src.l3num = l3num;
 669
 670         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 671         if (err < 0)
 672                 return err;
 673
 674         if (!tb[CTA_TUPLE_PROTO])
 675                 return -EINVAL;
 676
 677         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 678         if (err < 0)
 679                 return err;
 680
 681         /* orig and expect tuples get DIR_ORIGINAL */
 682         if (type == CTA_TUPLE_REPLY)
 683                 tuple->dst.dir = IP_CT_DIR_REPLY;
 684         else
 685                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 686
 687         return 0;
 688 }
 689
 690 #ifdef CONFIG_NF_NAT_NEEDED
 691 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
 692         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
 693         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
 694 };
 695
 696 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 697                                      const struct nf_conn *ct,
 698                                      struct nf_nat_range *range)
 699 {
 700         struct nlattr *tb[CTA_PROTONAT_MAX+1];
 701         const struct nf_nat_protocol *npt;
 702         int err;
 703
 704         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
 705         if (err < 0)
 706                 return err;
 707
 708         npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
 709         if (npt->nlattr_to_range)
 710                 err = npt->nlattr_to_range(tb, range);
 711         nf_nat_proto_put(npt);
 712         return err;
 713 }
 714
 715 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
 716         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
 717         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
 718 };
 719
 720 static inline int
 721 nfnetlink_parse_nat(struct nlattr *nat,
 722                     const struct nf_conn *ct, struct nf_nat_range *range)
 723 {
 724         struct nlattr *tb[CTA_NAT_MAX+1];
 725         int err;
 726
 727         memset(range, 0, sizeof(*range));
 728
 729         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
 730         if (err < 0)
 731                 return err;
 732
 733         if (tb[CTA_NAT_MINIP])
 734                 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
 735
 736         if (!tb[CTA_NAT_MAXIP])
 737                 range->max_ip = range->min_ip;
 738         else
 739                 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
 740
 741         if (range->min_ip)
 742                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 743
 744         if (!tb[CTA_NAT_PROTO])
 745                 return 0;
 746
 747         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
 748         if (err < 0)
 749                 return err;
 750
 751         return 0;
 752 }
 753 #endif
 754
 755 static inline int
 756 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 757 {
 758         struct nlattr *tb[CTA_HELP_MAX+1];
 759
 760         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 761
 762         if (!tb[CTA_HELP_NAME])
 763                 return -EINVAL;
 764
 765         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 766
 767         return 0;
 768 }
 769
 770 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 771         [CTA_STATUS]            = { .type = NLA_U32 },
 772         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 773         [CTA_MARK]              = { .type = NLA_U32 },
 774         [CTA_USE]               = { .type = NLA_U32 },
 775         [CTA_ID]                = { .type = NLA_U32 },
 776 };
 777
 778 static int
 779 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 780                         struct nlmsghdr *nlh, struct nlattr *cda[])
 781 {
 782         struct nf_conntrack_tuple_hash *h;
 783         struct nf_conntrack_tuple tuple;
 784         struct nf_conn *ct;
 785         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 786         u_int8_t u3 = nfmsg->nfgen_family;
 787         int err = 0;
 788
 789         if (cda[CTA_TUPLE_ORIG])
 790                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 791         else if (cda[CTA_TUPLE_REPLY])
 792                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 793         else {
 794                 /* Flush the whole table */
 795                 nf_conntrack_flush();
 796                 return 0;
 797         }
 798
 799         if (err < 0)
 800                 return err;
 801
 802         h = nf_conntrack_find_get(&tuple);
 803         if (!h)
 804                 return -ENOENT;
 805
 806         ct = nf_ct_tuplehash_to_ctrack(h);
 807
 808         if (cda[CTA_ID]) {
 809                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 810                 if (id != (u32)(unsigned long)ct) {
 811                         nf_ct_put(ct);
 812                         return -ENOENT;
 813                 }
 814         }
 815
 816         nf_ct_kill(ct);
 817         nf_ct_put(ct);
 818
 819         return 0;
 820 }
 821
 822 static int
 823 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 824                         struct nlmsghdr *nlh, struct nlattr *cda[])
 825 {
 826         struct nf_conntrack_tuple_hash *h;
 827         struct nf_conntrack_tuple tuple;
 828         struct nf_conn *ct;
 829         struct sk_buff *skb2 = NULL;
 830         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 831         u_int8_t u3 = nfmsg->nfgen_family;
 832         int err = 0;
 833
 834         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 835 #ifndef CONFIG_NF_CT_ACCT
 836                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 837                         return -ENOTSUPP;
 838 #endif
 839                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 840                                           ctnetlink_done);
 841         }
 842
 843         if (cda[CTA_TUPLE_ORIG])
 844                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 845         else if (cda[CTA_TUPLE_REPLY])
 846                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 847         else
 848                 return -EINVAL;
 849
 850         if (err < 0)
 851                 return err;
 852
 853         h = nf_conntrack_find_get(&tuple);
 854         if (!h)
 855                 return -ENOENT;
 856
 857         ct = nf_ct_tuplehash_to_ctrack(h);
 858
 859         err = -ENOMEM;
 860         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 861         if (!skb2) {
 862                 nf_ct_put(ct);
 863                 return -ENOMEM;
 864         }
 865
 866         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 867                                   IPCTNL_MSG_CT_NEW, 1, ct);
 868         nf_ct_put(ct);
 869         if (err <= 0)
 870                 goto free;
 871
 872         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 873         if (err < 0)
 874                 goto out;
 875
 876         return 0;
 877
 878 free:
 879         kfree_skb(skb2);
 880 out:
 881         return err;
 882 }
 883
 884 static int
 885 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 886 {
 887         unsigned long d;
 888         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 889         d = ct->status ^ status;
 890
 891         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 892                 /* unchangeable */
 893                 return -EBUSY;
 894
 895         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 896                 /* SEEN_REPLY bit can only be set */
 897                 return -EBUSY;
 898
 899         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 900                 /* ASSURED bit can only be set */
 901                 return -EBUSY;
 902
 903         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 904 #ifndef CONFIG_NF_NAT_NEEDED
 905                 return -EOPNOTSUPP;
 906 #else
 907                 struct nf_nat_range range;
 908
 909                 if (cda[CTA_NAT_DST]) {
 910                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 911                                                 &range) < 0)
 912                                 return -EINVAL;
 913                         if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
 914                                 return -EEXIST;
 915                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
 916                 }
 917                 if (cda[CTA_NAT_SRC]) {
 918                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 919                                                 &range) < 0)
 920                                 return -EINVAL;
 921                         if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
 922                                 return -EEXIST;
 923                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
 924                 }
 925 #endif
 926         }
 927
 928         /* Be careful here, modifying NAT bits can screw up things,
 929          * so don't let users modify them directly if they don't pass
 930          * nf_nat_range. */
 931         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 932         return 0;
 933 }
 934
 935
 936 static inline int
 937 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 938 {
 939         struct nf_conntrack_helper *helper;
 940         struct nf_conn_help *help = nfct_help(ct);
 941         char *helpname;
 942         int err;
 943
 944         /* don't change helper of sibling connections */
 945         if (ct->master)
 946                 return -EBUSY;
 947
 948         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 949         if (err < 0)
 950                 return err;
 951
 952         if (!strcmp(helpname, "")) {
 953                 if (help && help->helper) {
 954                         /* we had a helper before ... */
 955                         nf_ct_remove_expectations(ct);
 956                         rcu_assign_pointer(help->helper, NULL);
 957                 }
 958
 959                 return 0;
 960         }
 961
 962         helper = __nf_conntrack_helper_find_byname(helpname);
 963         if (helper == NULL)
 964                 return -EOPNOTSUPP;
 965
 966         if (help) {
 967                 if (help->helper == helper)
 968                         return 0;
 969                 if (help->helper)
 970                         return -EBUSY;
 971                 /* need to zero data of old helper */
 972                 memset(&help->help, 0, sizeof(help->help));
 973         } else {
 974                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 975                 if (help == NULL)
 976                         return -ENOMEM;
 977         }
 978
 979         rcu_assign_pointer(help->helper, helper);
 980
 981         return 0;
 982 }
 983
 984 static inline int
 985 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 986 {
 987         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 988
 989         if (!del_timer(&ct->timeout))
 990                 return -ETIME;
 991
 992         ct->timeout.expires = jiffies + timeout * HZ;
 993         add_timer(&ct->timeout);
 994
 995         return 0;
 996 }
 997
 998 static inline int
 999 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1000 {
1001         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1002         struct nf_conntrack_l4proto *l4proto;
1003         int err = 0;
1004
1005         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1006
1007         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1008         if (l4proto->from_nlattr)
1009                 err = l4proto->from_nlattr(tb, ct);
1010         nf_ct_l4proto_put(l4proto);
1011
1012         return err;
1013 }
1014
1015 #ifdef CONFIG_NF_NAT_NEEDED
1016 static inline int
1017 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1018 {
1019         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1020
1021         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1022
1023         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1024                 return -EINVAL;
1025
1026         natseq->correction_pos =
1027                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1028
1029         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1030                 return -EINVAL;
1031
1032         natseq->offset_before =
1033                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1034
1035         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1036                 return -EINVAL;
1037
1038         natseq->offset_after =
1039                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1040
1041         return 0;
1042 }
1043
1044 static int
1045 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1046 {
1047         int ret = 0;
1048         struct nf_conn_nat *nat = nfct_nat(ct);
1049
1050         if (!nat)
1051                 return 0;
1052
1053         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1054                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1055                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1056                 if (ret < 0)
1057                         return ret;
1058
1059                 ct->status |= IPS_SEQ_ADJUST;
1060         }
1061
1062         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1063                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1064                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1065                 if (ret < 0)
1066                         return ret;
1067
1068                 ct->status |= IPS_SEQ_ADJUST;
1069         }
1070
1071         return 0;
1072 }
1073 #endif
1074
1075 static int
1076 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1077 {
1078         int err;
1079
1080         if (cda[CTA_HELP]) {
1081                 err = ctnetlink_change_helper(ct, cda);
1082                 if (err < 0)
1083                         return err;
1084         }
1085
1086         if (cda[CTA_TIMEOUT]) {
1087                 err = ctnetlink_change_timeout(ct, cda);
1088                 if (err < 0)
1089                         return err;
1090         }
1091
1092         if (cda[CTA_STATUS]) {
1093                 err = ctnetlink_change_status(ct, cda);
1094                 if (err < 0)
1095                         return err;
1096         }
1097
1098         if (cda[CTA_PROTOINFO]) {
1099                 err = ctnetlink_change_protoinfo(ct, cda);
1100                 if (err < 0)
1101                         return err;
1102         }
1103
1104 #if defined(CONFIG_NF_CONNTRACK_MARK)
1105         if (cda[CTA_MARK])
1106                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1107 #endif
1108
1109 #ifdef CONFIG_NF_NAT_NEEDED
1110         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1111                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1112                 if (err < 0)
1113                         return err;
1114         }
1115 #endif
1116
1117         return 0;
1118 }
1119
1120 static int
1121 ctnetlink_create_conntrack(struct nlattr *cda[],
1122                            struct nf_conntrack_tuple *otuple,
1123                            struct nf_conntrack_tuple *rtuple,
1124                            struct nf_conn *master_ct)
1125 {
1126         struct nf_conn *ct;
1127         int err = -EINVAL;
1128         struct nf_conn_help *help;
1129         struct nf_conntrack_helper *helper;
1130
1131         ct = nf_conntrack_alloc(otuple, rtuple);
1132         if (ct == NULL || IS_ERR(ct))
1133                 return -ENOMEM;
1134
1135         if (!cda[CTA_TIMEOUT])
1136                 goto err;
1137         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1138
1139         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1140         ct->status |= IPS_CONFIRMED;
1141
1142         if (cda[CTA_STATUS]) {
1143                 err = ctnetlink_change_status(ct, cda);
1144                 if (err < 0)
1145                         goto err;
1146         }
1147
1148         if (cda[CTA_PROTOINFO]) {
1149                 err = ctnetlink_change_protoinfo(ct, cda);
1150                 if (err < 0)
1151                         goto err;
1152         }
1153
1154 #if defined(CONFIG_NF_CONNTRACK_MARK)
1155         if (cda[CTA_MARK])
1156                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1157 #endif
1158
1159         rcu_read_lock();
1160         helper = __nf_ct_helper_find(rtuple);
1161         if (helper) {
1162                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1163                 if (help == NULL) {
1164                         rcu_read_unlock();
1165                         err = -ENOMEM;
1166                         goto err;
1167                 }
1168                 /* not in hash table yet so not strictly necessary */
1169                 rcu_assign_pointer(help->helper, helper);
1170         }
1171
1172         /* setup master conntrack: this is a confirmed expectation */
1173         if (master_ct) {
1174                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1175                 ct->master = master_ct;
1176         }
1177
1178         add_timer(&ct->timeout);
1179         nf_conntrack_hash_insert(ct);
1180         rcu_read_unlock();
1181
1182         return 0;
1183
1184 err:
1185         nf_conntrack_free(ct);
1186         return err;
1187 }
1188
1189 static int
1190 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1191                         struct nlmsghdr *nlh, struct nlattr *cda[])
1192 {
1193         struct nf_conntrack_tuple otuple, rtuple;
1194         struct nf_conntrack_tuple_hash *h = NULL;
1195         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1196         u_int8_t u3 = nfmsg->nfgen_family;
1197         int err = 0;
1198
1199         if (cda[CTA_TUPLE_ORIG]) {
1200                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1201                 if (err < 0)
1202                         return err;
1203         }
1204
1205         if (cda[CTA_TUPLE_REPLY]) {
1206                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1207                 if (err < 0)
1208                         return err;
1209         }
1210
1211         spin_lock_bh(&nf_conntrack_lock);
1212         if (cda[CTA_TUPLE_ORIG])
1213                 h = __nf_conntrack_find(&otuple);
1214         else if (cda[CTA_TUPLE_REPLY])
1215                 h = __nf_conntrack_find(&rtuple);
1216
1217         if (h == NULL) {
1218                 struct nf_conntrack_tuple master;
1219                 struct nf_conntrack_tuple_hash *master_h = NULL;
1220                 struct nf_conn *master_ct = NULL;
1221
1222                 if (cda[CTA_TUPLE_MASTER]) {
1223                         err = ctnetlink_parse_tuple(cda,
1224                                                     &master,
1225                                                     CTA_TUPLE_MASTER,
1226                                                     u3);
1227                         if (err < 0)
1228                                 goto out_unlock;
1229
1230                         master_h = __nf_conntrack_find(&master);
1231                         if (master_h == NULL) {
1232                                 err = -ENOENT;
1233                                 goto out_unlock;
1234                         }
1235                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1236                         atomic_inc(&master_ct->ct_general.use);
1237                 }
1238
1239                 spin_unlock_bh(&nf_conntrack_lock);
1240                 err = -ENOENT;
1241                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1242                         err = ctnetlink_create_conntrack(cda,
1243                                                          &otuple,
1244                                                          &rtuple,
1245                                                          master_ct);
1246                 if (err < 0 && master_ct)
1247                         nf_ct_put(master_ct);
1248
1249                 return err;
1250         }
1251         /* implicit 'else' */
1252
1253         /* We manipulate the conntrack inside the global conntrack table lock,
1254          * so there's no need to increase the refcount */
1255         err = -EEXIST;
1256         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1257                 /* we only allow nat config for new conntracks */
1258                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1259                         err = -EOPNOTSUPP;
1260                         goto out_unlock;
1261                 }
1262                 /* can't link an existing conntrack to a master */
1263                 if (cda[CTA_TUPLE_MASTER]) {
1264                         err = -EOPNOTSUPP;
1265                         goto out_unlock;
1266                 }
1267                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1268                                                  cda);
1269         }
1270
1271 out_unlock:
1272         spin_unlock_bh(&nf_conntrack_lock);
1273         return err;
1274 }
1275
1276 /***********************************************************************
1277  * EXPECT
1278  ***********************************************************************/
1279
1280 static inline int
1281 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1282                          const struct nf_conntrack_tuple *tuple,
1283                          enum ctattr_expect type)
1284 {
1285         struct nlattr *nest_parms;
1286
1287         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1288         if (!nest_parms)
1289                 goto nla_put_failure;
1290         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1291                 goto nla_put_failure;
1292         nla_nest_end(skb, nest_parms);
1293
1294         return 0;
1295
1296 nla_put_failure:
1297         return -1;
1298 }
1299
1300 static inline int
1301 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1302                         const struct nf_conntrack_tuple *tuple,
1303                         const struct nf_conntrack_tuple_mask *mask)
1304 {
1305         int ret;
1306         struct nf_conntrack_l3proto *l3proto;
1307         struct nf_conntrack_l4proto *l4proto;
1308         struct nf_conntrack_tuple m;
1309         struct nlattr *nest_parms;
1310
1311         memset(&m, 0xFF, sizeof(m));
1312         m.src.u.all = mask->src.u.all;
1313         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1314
1315         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1316         if (!nest_parms)
1317                 goto nla_put_failure;
1318
1319         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1320         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1321         nf_ct_l3proto_put(l3proto);
1322
1323         if (unlikely(ret < 0))
1324                 goto nla_put_failure;
1325
1326         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1327         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1328         nf_ct_l4proto_put(l4proto);
1329         if (unlikely(ret < 0))
1330                 goto nla_put_failure;
1331
1332         nla_nest_end(skb, nest_parms);
1333
1334         return 0;
1335
1336 nla_put_failure:
1337         return -1;
1338 }
1339
1340 static int
1341 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1342                           const struct nf_conntrack_expect *exp)
1343 {
1344         struct nf_conn *master = exp->master;
1345         long timeout = (exp->timeout.expires - jiffies) / HZ;
1346
1347         if (timeout < 0)
1348                 timeout = 0;
1349
1350         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1351                 goto nla_put_failure;
1352         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1353                 goto nla_put_failure;
1354         if (ctnetlink_exp_dump_tuple(skb,
1355                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1356                                  CTA_EXPECT_MASTER) < 0)
1357                 goto nla_put_failure;
1358
1359         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1360         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1361
1362         return 0;
1363
1364 nla_put_failure:
1365         return -1;
1366 }
1367
1368 static int
1369 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1370                     int event,
1371                     int nowait,
1372                     const struct nf_conntrack_expect *exp)
1373 {
1374         struct nlmsghdr *nlh;
1375         struct nfgenmsg *nfmsg;
1376         unsigned char *b = skb_tail_pointer(skb);
1377
1378         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1379         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1380         nfmsg  = NLMSG_DATA(nlh);
1381
1382         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1383         nfmsg->nfgen_family = exp->tuple.src.l3num;
1384         nfmsg->version      = NFNETLINK_V0;
1385         nfmsg->res_id       = 0;
1386
1387         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1388                 goto nla_put_failure;
1389
1390         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1391         return skb->len;
1392
1393 nlmsg_failure:
1394 nla_put_failure:
1395         nlmsg_trim(skb, b);
1396         return -1;
1397 }
1398
1399 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1400 static int ctnetlink_expect_event(struct notifier_block *this,
1401                                   unsigned long events, void *ptr)
1402 {
1403         struct nlmsghdr *nlh;
1404         struct nfgenmsg *nfmsg;
1405         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1406         struct sk_buff *skb;
1407         unsigned int type;
1408         sk_buff_data_t b;
1409         int flags = 0;
1410
1411         if (events & IPEXP_NEW) {
1412                 type = IPCTNL_MSG_EXP_NEW;
1413                 flags = NLM_F_CREATE|NLM_F_EXCL;
1414         } else
1415                 return NOTIFY_DONE;
1416
1417         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1418                 return NOTIFY_DONE;
1419
1420         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1421         if (!skb)
1422                 return NOTIFY_DONE;
1423
1424         b = skb->tail;
1425
1426         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1427         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1428         nfmsg = NLMSG_DATA(nlh);
1429
1430         nlh->nlmsg_flags    = flags;
1431         nfmsg->nfgen_family = exp->tuple.src.l3num;
1432         nfmsg->version      = NFNETLINK_V0;
1433         nfmsg->res_id       = 0;
1434
1435         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1436                 goto nla_put_failure;
1437
1438         nlh->nlmsg_len = skb->tail - b;
1439         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1440         return NOTIFY_DONE;
1441
1442 nlmsg_failure:
1443 nla_put_failure:
1444         kfree_skb(skb);
1445         return NOTIFY_DONE;
1446 }
1447 #endif
1448 static int ctnetlink_exp_done(struct netlink_callback *cb)
1449 {
1450         if (cb->args[1])
1451                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1452         return 0;
1453 }
1454
1455 static int
1456 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1457 {
1458         struct nf_conntrack_expect *exp, *last;
1459         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1460         struct hlist_node *n;
1461         u_int8_t l3proto = nfmsg->nfgen_family;
1462
1463         rcu_read_lock();
1464         last = (struct nf_conntrack_expect *)cb->args[1];
1465         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1466 restart:
1467                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1468                                      hnode) {
1469                         if (l3proto && exp->tuple.src.l3num != l3proto)
1470                                 continue;
1471                         if (cb->args[1]) {
1472                                 if (exp != last)
1473                                         continue;
1474                                 cb->args[1] = 0;
1475                         }
1476                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1477                                                     cb->nlh->nlmsg_seq,
1478                                                     IPCTNL_MSG_EXP_NEW,
1479                                                     1, exp) < 0) {
1480                                 if (!atomic_inc_not_zero(&exp->use))
1481                                         continue;
1482                                 cb->args[1] = (unsigned long)exp;
1483                                 goto out;
1484                         }
1485                 }
1486                 if (cb->args[1]) {
1487                         cb->args[1] = 0;
1488                         goto restart;
1489                 }
1490         }
1491 out:
1492         rcu_read_unlock();
1493         if (last)
1494                 nf_ct_expect_put(last);
1495
1496         return skb->len;
1497 }
1498
1499 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1500         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1501         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1502 };
1503
1504 static int
1505 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1506                      struct nlmsghdr *nlh, struct nlattr *cda[])
1507 {
1508         struct nf_conntrack_tuple tuple;
1509         struct nf_conntrack_expect *exp;
1510         struct sk_buff *skb2;
1511         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1512         u_int8_t u3 = nfmsg->nfgen_family;
1513         int err = 0;
1514
1515         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1516                 return netlink_dump_start(ctnl, skb, nlh,
1517                                           ctnetlink_exp_dump_table,
1518                                           ctnetlink_exp_done);
1519         }
1520
1521         if (cda[CTA_EXPECT_MASTER])
1522                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1523         else
1524                 return -EINVAL;
1525
1526         if (err < 0)
1527                 return err;
1528
1529         exp = nf_ct_expect_find_get(&tuple);
1530         if (!exp)
1531                 return -ENOENT;
1532
1533         if (cda[CTA_EXPECT_ID]) {
1534                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1535                 if (ntohl(id) != (u32)(unsigned long)exp) {
1536                         nf_ct_expect_put(exp);
1537                         return -ENOENT;
1538                 }
1539         }
1540
1541         err = -ENOMEM;
1542         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1543         if (!skb2)
1544                 goto out;
1545
1546         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1547                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1548                                       1, exp);
1549         if (err <= 0)
1550                 goto free;
1551
1552         nf_ct_expect_put(exp);
1553
1554         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1555
1556 free:
1557         kfree_skb(skb2);
1558 out:
1559         nf_ct_expect_put(exp);
1560         return err;
1561 }
1562
1563 static int
1564 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1565                      struct nlmsghdr *nlh, struct nlattr *cda[])
1566 {
1567         struct nf_conntrack_expect *exp;
1568         struct nf_conntrack_tuple tuple;
1569         struct nf_conntrack_helper *h;
1570         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1571         struct hlist_node *n, *next;
1572         u_int8_t u3 = nfmsg->nfgen_family;
1573         unsigned int i;
1574         int err;
1575
1576         if (cda[CTA_EXPECT_TUPLE]) {
1577                 /* delete a single expect by tuple */
1578                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1579                 if (err < 0)
1580                         return err;
1581
1582                 /* bump usage count to 2 */
1583                 exp = nf_ct_expect_find_get(&tuple);
1584                 if (!exp)
1585                         return -ENOENT;
1586
1587                 if (cda[CTA_EXPECT_ID]) {
1588                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1589                         if (ntohl(id) != (u32)(unsigned long)exp) {
1590                                 nf_ct_expect_put(exp);
1591                                 return -ENOENT;
1592                         }
1593                 }
1594
1595                 /* after list removal, usage count == 1 */
1596                 nf_ct_unexpect_related(exp);
1597                 /* have to put what we 'get' above.
1598                  * after this line usage count == 0 */
1599                 nf_ct_expect_put(exp);
1600         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1601                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1602                 struct nf_conn_help *m_help;
1603
1604                 /* delete all expectations for this helper */
1605                 spin_lock_bh(&nf_conntrack_lock);
1606                 h = __nf_conntrack_helper_find_byname(name);
1607                 if (!h) {
1608                         spin_unlock_bh(&nf_conntrack_lock);
1609                         return -EOPNOTSUPP;
1610                 }
1611                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1612                         hlist_for_each_entry_safe(exp, n, next,
1613                                                   &nf_ct_expect_hash[i],
1614                                                   hnode) {
1615                                 m_help = nfct_help(exp->master);
1616                                 if (m_help->helper == h
1617                                     && del_timer(&exp->timeout)) {
1618                                         nf_ct_unlink_expect(exp);
1619                                         nf_ct_expect_put(exp);
1620                                 }
1621                         }
1622                 }
1623                 spin_unlock_bh(&nf_conntrack_lock);
1624         } else {
1625                 /* This basically means we have to flush everything*/
1626                 spin_lock_bh(&nf_conntrack_lock);
1627                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1628                         hlist_for_each_entry_safe(exp, n, next,
1629                                                   &nf_ct_expect_hash[i],
1630                                                   hnode) {
1631                                 if (del_timer(&exp->timeout)) {
1632                                         nf_ct_unlink_expect(exp);
1633                                         nf_ct_expect_put(exp);
1634                                 }
1635                         }
1636                 }
1637                 spin_unlock_bh(&nf_conntrack_lock);
1638         }
1639
1640         return 0;
1641 }
1642 static int
1643 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1644 {
1645         return -EOPNOTSUPP;
1646 }
1647
1648 static int
1649 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1650 {
1651         struct nf_conntrack_tuple tuple, mask, master_tuple;
1652         struct nf_conntrack_tuple_hash *h = NULL;
1653         struct nf_conntrack_expect *exp;
1654         struct nf_conn *ct;
1655         struct nf_conn_help *help;
1656         int err = 0;
1657
1658         /* caller guarantees that those three CTA_EXPECT_* exist */
1659         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1660         if (err < 0)
1661                 return err;
1662         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1663         if (err < 0)
1664                 return err;
1665         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1666         if (err < 0)
1667                 return err;
1668
1669         /* Look for master conntrack of this expectation */
1670         h = nf_conntrack_find_get(&master_tuple);
1671         if (!h)
1672                 return -ENOENT;
1673         ct = nf_ct_tuplehash_to_ctrack(h);
1674         help = nfct_help(ct);
1675
1676         if (!help || !help->helper) {
1677                 /* such conntrack hasn't got any helper, abort */
1678                 err = -EINVAL;
1679                 goto out;
1680         }
1681
1682         exp = nf_ct_expect_alloc(ct);
1683         if (!exp) {
1684                 err = -ENOMEM;
1685                 goto out;
1686         }
1687
1688         exp->expectfn = NULL;
1689         exp->flags = 0;
1690         exp->master = ct;
1691         exp->helper = NULL;
1692         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1693         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1694         exp->mask.src.u.all = mask.src.u.all;
1695
1696         err = nf_ct_expect_related(exp);
1697         nf_ct_expect_put(exp);
1698
1699 out:
1700         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1701         return err;
1702 }
1703
1704 static int
1705 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1706                      struct nlmsghdr *nlh, struct nlattr *cda[])
1707 {
1708         struct nf_conntrack_tuple tuple;
1709         struct nf_conntrack_expect *exp;
1710         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1711         u_int8_t u3 = nfmsg->nfgen_family;
1712         int err = 0;
1713
1714         if (!cda[CTA_EXPECT_TUPLE]
1715             || !cda[CTA_EXPECT_MASK]
1716             || !cda[CTA_EXPECT_MASTER])
1717                 return -EINVAL;
1718
1719         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1720         if (err < 0)
1721                 return err;
1722
1723         spin_lock_bh(&nf_conntrack_lock);
1724         exp = __nf_ct_expect_find(&tuple);
1725
1726         if (!exp) {
1727                 spin_unlock_bh(&nf_conntrack_lock);
1728                 err = -ENOENT;
1729                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1730                         err = ctnetlink_create_expect(cda, u3);
1731                 return err;
1732         }
1733
1734         err = -EEXIST;
1735         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1736                 err = ctnetlink_change_expect(exp, cda);
1737         spin_unlock_bh(&nf_conntrack_lock);
1738
1739         return err;
1740 }
1741
1742 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1743 static struct notifier_block ctnl_notifier = {
1744         .notifier_call  = ctnetlink_conntrack_event,
1745 };
1746
1747 static struct notifier_block ctnl_notifier_exp = {
1748         .notifier_call  = ctnetlink_expect_event,
1749 };
1750 #endif
1751
1752 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1753         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1754                                             .attr_count = CTA_MAX,
1755                                             .policy = ct_nla_policy },
1756         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1757                                             .attr_count = CTA_MAX,
1758                                             .policy = ct_nla_policy },
1759         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1760                                             .attr_count = CTA_MAX,
1761                                             .policy = ct_nla_policy },
1762         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1763                                             .attr_count = CTA_MAX,
1764                                             .policy = ct_nla_policy },
1765 };
1766
1767 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1768         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1769                                             .attr_count = CTA_EXPECT_MAX,
1770                                             .policy = exp_nla_policy },
1771         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1772                                             .attr_count = CTA_EXPECT_MAX,
1773                                             .policy = exp_nla_policy },
1774         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1775                                             .attr_count = CTA_EXPECT_MAX,
1776                                             .policy = exp_nla_policy },
1777 };
1778
1779 static const struct nfnetlink_subsystem ctnl_subsys = {
1780         .name                           = "conntrack",
1781         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1782         .cb_count                       = IPCTNL_MSG_MAX,
1783         .cb                             = ctnl_cb,
1784 };
1785
1786 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1787         .name                           = "conntrack_expect",
1788         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1789         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1790         .cb                             = ctnl_exp_cb,
1791 };
1792
1793 MODULE_ALIAS("ip_conntrack_netlink");
1794 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1795 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1796
1797 static int __init ctnetlink_init(void)
1798 {
1799         int ret;
1800
1801         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1802         ret = nfnetlink_subsys_register(&ctnl_subsys);
1803         if (ret < 0) {
1804                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1805                 goto err_out;
1806         }
1807
1808         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1809         if (ret < 0) {
1810                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1811                 goto err_unreg_subsys;
1812         }
1813
1814 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1815         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1816         if (ret < 0) {
1817                 printk("ctnetlink_init: cannot register notifier.\n");
1818                 goto err_unreg_exp_subsys;
1819         }
1820
1821         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1822         if (ret < 0) {
1823                 printk("ctnetlink_init: cannot expect register notifier.\n");
1824                 goto err_unreg_notifier;
1825         }
1826 #endif
1827
1828         return 0;
1829
1830 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1831 err_unreg_notifier:
1832         nf_conntrack_unregister_notifier(&ctnl_notifier);
1833 err_unreg_exp_subsys:
1834         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1835 #endif
1836 err_unreg_subsys:
1837         nfnetlink_subsys_unregister(&ctnl_subsys);
1838 err_out:
1839         return ret;
1840 }
1841
1842 static void __exit ctnetlink_exit(void)
1843 {
1844         printk("ctnetlink: unregistering from nfnetlink.\n");
1845
1846 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1847         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1848         nf_conntrack_unregister_notifier(&ctnl_notifier);
1849 #endif
1850
1851         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1852         nfnetlink_subsys_unregister(&ctnl_subsys);
1853         return;
1854 }
1855
1856 module_init(ctnetlink_init);
1857 module_exit(ctnetlink_exit);