SAFE public projects git trees. - safe/jmp/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 (events & IPCT_DESTROY) {
 479                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 480                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 481                         goto nla_put_failure;
 482         } else {
 483                 if (ctnetlink_dump_status(skb, ct) < 0)
 484                         goto nla_put_failure;
 485
 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         if (del_timer(&ct->timeout))
 816                 ct->timeout.function((unsigned long)ct);
 817
 818         nf_ct_put(ct);
 819
 820         return 0;
 821 }
 822
 823 static int
 824 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 825                         struct nlmsghdr *nlh, struct nlattr *cda[])
 826 {
 827         struct nf_conntrack_tuple_hash *h;
 828         struct nf_conntrack_tuple tuple;
 829         struct nf_conn *ct;
 830         struct sk_buff *skb2 = NULL;
 831         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 832         u_int8_t u3 = nfmsg->nfgen_family;
 833         int err = 0;
 834
 835         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 836 #ifndef CONFIG_NF_CT_ACCT
 837                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 838                         return -ENOTSUPP;
 839 #endif
 840                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 841                                           ctnetlink_done);
 842         }
 843
 844         if (cda[CTA_TUPLE_ORIG])
 845                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 846         else if (cda[CTA_TUPLE_REPLY])
 847                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 848         else
 849                 return -EINVAL;
 850
 851         if (err < 0)
 852                 return err;
 853
 854         h = nf_conntrack_find_get(&tuple);
 855         if (!h)
 856                 return -ENOENT;
 857
 858         ct = nf_ct_tuplehash_to_ctrack(h);
 859
 860         err = -ENOMEM;
 861         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 862         if (!skb2) {
 863                 nf_ct_put(ct);
 864                 return -ENOMEM;
 865         }
 866
 867         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 868                                   IPCTNL_MSG_CT_NEW, 1, ct);
 869         nf_ct_put(ct);
 870         if (err <= 0)
 871                 goto free;
 872
 873         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 874         if (err < 0)
 875                 goto out;
 876
 877         return 0;
 878
 879 free:
 880         kfree_skb(skb2);
 881 out:
 882         return err;
 883 }
 884
 885 static int
 886 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 887 {
 888         unsigned long d;
 889         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 890         d = ct->status ^ status;
 891
 892         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 893                 /* unchangeable */
 894                 return -EBUSY;
 895
 896         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 897                 /* SEEN_REPLY bit can only be set */
 898                 return -EBUSY;
 899
 900         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 901                 /* ASSURED bit can only be set */
 902                 return -EBUSY;
 903
 904         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 905 #ifndef CONFIG_NF_NAT_NEEDED
 906                 return -EOPNOTSUPP;
 907 #else
 908                 struct nf_nat_range range;
 909
 910                 if (cda[CTA_NAT_DST]) {
 911                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 912                                                 &range) < 0)
 913                                 return -EINVAL;
 914                         if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
 915                                 return -EEXIST;
 916                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
 917                 }
 918                 if (cda[CTA_NAT_SRC]) {
 919                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 920                                                 &range) < 0)
 921                                 return -EINVAL;
 922                         if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
 923                                 return -EEXIST;
 924                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
 925                 }
 926 #endif
 927         }
 928
 929         /* Be careful here, modifying NAT bits can screw up things,
 930          * so don't let users modify them directly if they don't pass
 931          * nf_nat_range. */
 932         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 933         return 0;
 934 }
 935
 936
 937 static inline int
 938 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 939 {
 940         struct nf_conntrack_helper *helper;
 941         struct nf_conn_help *help = nfct_help(ct);
 942         char *helpname;
 943         int err;
 944
 945         /* don't change helper of sibling connections */
 946         if (ct->master)
 947                 return -EBUSY;
 948
 949         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 950         if (err < 0)
 951                 return err;
 952
 953         if (!strcmp(helpname, "")) {
 954                 if (help && help->helper) {
 955                         /* we had a helper before ... */
 956                         nf_ct_remove_expectations(ct);
 957                         rcu_assign_pointer(help->helper, NULL);
 958                 }
 959
 960                 return 0;
 961         }
 962
 963         helper = __nf_conntrack_helper_find_byname(helpname);
 964         if (helper == NULL)
 965                 return -EOPNOTSUPP;
 966
 967         if (help) {
 968                 if (help->helper == helper)
 969                         return 0;
 970                 if (help->helper)
 971                         return -EBUSY;
 972                 /* need to zero data of old helper */
 973                 memset(&help->help, 0, sizeof(help->help));
 974         } else {
 975                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 976                 if (help == NULL)
 977                         return -ENOMEM;
 978         }
 979
 980         rcu_assign_pointer(help->helper, helper);
 981
 982         return 0;
 983 }
 984
 985 static inline int
 986 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 987 {
 988         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 989
 990         if (!del_timer(&ct->timeout))
 991                 return -ETIME;
 992
 993         ct->timeout.expires = jiffies + timeout * HZ;
 994         add_timer(&ct->timeout);
 995
 996         return 0;
 997 }
 998
 999 static inline int
1000 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1001 {
1002         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1003         struct nf_conntrack_l4proto *l4proto;
1004         int err = 0;
1005
1006         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1007
1008         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1009         if (l4proto->from_nlattr)
1010                 err = l4proto->from_nlattr(tb, ct);
1011         nf_ct_l4proto_put(l4proto);
1012
1013         return err;
1014 }
1015
1016 #ifdef CONFIG_NF_NAT_NEEDED
1017 static inline int
1018 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1019 {
1020         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1021
1022         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1023
1024         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1025                 return -EINVAL;
1026
1027         natseq->correction_pos =
1028                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1029
1030         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1031                 return -EINVAL;
1032
1033         natseq->offset_before =
1034                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1035
1036         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1037                 return -EINVAL;
1038
1039         natseq->offset_after =
1040                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1041
1042         return 0;
1043 }
1044
1045 static int
1046 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1047 {
1048         int ret = 0;
1049         struct nf_conn_nat *nat = nfct_nat(ct);
1050
1051         if (!nat)
1052                 return 0;
1053
1054         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1055                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1056                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1057                 if (ret < 0)
1058                         return ret;
1059
1060                 ct->status |= IPS_SEQ_ADJUST;
1061         }
1062
1063         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1064                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1065                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1066                 if (ret < 0)
1067                         return ret;
1068
1069                 ct->status |= IPS_SEQ_ADJUST;
1070         }
1071
1072         return 0;
1073 }
1074 #endif
1075
1076 static int
1077 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1078 {
1079         int err;
1080
1081         if (cda[CTA_HELP]) {
1082                 err = ctnetlink_change_helper(ct, cda);
1083                 if (err < 0)
1084                         return err;
1085         }
1086
1087         if (cda[CTA_TIMEOUT]) {
1088                 err = ctnetlink_change_timeout(ct, cda);
1089                 if (err < 0)
1090                         return err;
1091         }
1092
1093         if (cda[CTA_STATUS]) {
1094                 err = ctnetlink_change_status(ct, cda);
1095                 if (err < 0)
1096                         return err;
1097         }
1098
1099         if (cda[CTA_PROTOINFO]) {
1100                 err = ctnetlink_change_protoinfo(ct, cda);
1101                 if (err < 0)
1102                         return err;
1103         }
1104
1105 #if defined(CONFIG_NF_CONNTRACK_MARK)
1106         if (cda[CTA_MARK])
1107                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1108 #endif
1109
1110 #ifdef CONFIG_NF_NAT_NEEDED
1111         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1112                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1113                 if (err < 0)
1114                         return err;
1115         }
1116 #endif
1117
1118         return 0;
1119 }
1120
1121 static int
1122 ctnetlink_create_conntrack(struct nlattr *cda[],
1123                            struct nf_conntrack_tuple *otuple,
1124                            struct nf_conntrack_tuple *rtuple,
1125                            struct nf_conn *master_ct)
1126 {
1127         struct nf_conn *ct;
1128         int err = -EINVAL;
1129         struct nf_conn_help *help;
1130         struct nf_conntrack_helper *helper;
1131
1132         ct = nf_conntrack_alloc(otuple, rtuple);
1133         if (ct == NULL || IS_ERR(ct))
1134                 return -ENOMEM;
1135
1136         if (!cda[CTA_TIMEOUT])
1137                 goto err;
1138         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1139
1140         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1141         ct->status |= IPS_CONFIRMED;
1142
1143         if (cda[CTA_STATUS]) {
1144                 err = ctnetlink_change_status(ct, cda);
1145                 if (err < 0)
1146                         goto err;
1147         }
1148
1149         if (cda[CTA_PROTOINFO]) {
1150                 err = ctnetlink_change_protoinfo(ct, cda);
1151                 if (err < 0)
1152                         goto err;
1153         }
1154
1155 #if defined(CONFIG_NF_CONNTRACK_MARK)
1156         if (cda[CTA_MARK])
1157                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1158 #endif
1159
1160         rcu_read_lock();
1161         helper = __nf_ct_helper_find(rtuple);
1162         if (helper) {
1163                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1164                 if (help == NULL) {
1165                         rcu_read_unlock();
1166                         err = -ENOMEM;
1167                         goto err;
1168                 }
1169                 /* not in hash table yet so not strictly necessary */
1170                 rcu_assign_pointer(help->helper, helper);
1171         }
1172
1173         /* setup master conntrack: this is a confirmed expectation */
1174         if (master_ct) {
1175                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1176                 ct->master = master_ct;
1177         }
1178
1179         add_timer(&ct->timeout);
1180         nf_conntrack_hash_insert(ct);
1181         rcu_read_unlock();
1182
1183         return 0;
1184
1185 err:
1186         nf_conntrack_free(ct);
1187         return err;
1188 }
1189
1190 static int
1191 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1192                         struct nlmsghdr *nlh, struct nlattr *cda[])
1193 {
1194         struct nf_conntrack_tuple otuple, rtuple;
1195         struct nf_conntrack_tuple_hash *h = NULL;
1196         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1197         u_int8_t u3 = nfmsg->nfgen_family;
1198         int err = 0;
1199
1200         if (cda[CTA_TUPLE_ORIG]) {
1201                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1202                 if (err < 0)
1203                         return err;
1204         }
1205
1206         if (cda[CTA_TUPLE_REPLY]) {
1207                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1208                 if (err < 0)
1209                         return err;
1210         }
1211
1212         spin_lock_bh(&nf_conntrack_lock);
1213         if (cda[CTA_TUPLE_ORIG])
1214                 h = __nf_conntrack_find(&otuple);
1215         else if (cda[CTA_TUPLE_REPLY])
1216                 h = __nf_conntrack_find(&rtuple);
1217
1218         if (h == NULL) {
1219                 struct nf_conntrack_tuple master;
1220                 struct nf_conntrack_tuple_hash *master_h = NULL;
1221                 struct nf_conn *master_ct = NULL;
1222
1223                 if (cda[CTA_TUPLE_MASTER]) {
1224                         err = ctnetlink_parse_tuple(cda,
1225                                                     &master,
1226                                                     CTA_TUPLE_MASTER,
1227                                                     u3);
1228                         if (err < 0)
1229                                 goto out_unlock;
1230
1231                         master_h = __nf_conntrack_find(&master);
1232                         if (master_h == NULL) {
1233                                 err = -ENOENT;
1234                                 goto out_unlock;
1235                         }
1236                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1237                         atomic_inc(&master_ct->ct_general.use);
1238                 }
1239
1240                 spin_unlock_bh(&nf_conntrack_lock);
1241                 err = -ENOENT;
1242                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1243                         err = ctnetlink_create_conntrack(cda,
1244                                                          &otuple,
1245                                                          &rtuple,
1246                                                          master_ct);
1247                 if (err < 0 && master_ct)
1248                         nf_ct_put(master_ct);
1249
1250                 return err;
1251         }
1252         /* implicit 'else' */
1253
1254         /* We manipulate the conntrack inside the global conntrack table lock,
1255          * so there's no need to increase the refcount */
1256         err = -EEXIST;
1257         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1258                 /* we only allow nat config for new conntracks */
1259                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1260                         err = -EOPNOTSUPP;
1261                         goto out_unlock;
1262                 }
1263                 /* can't link an existing conntrack to a master */
1264                 if (cda[CTA_TUPLE_MASTER]) {
1265                         err = -EOPNOTSUPP;
1266                         goto out_unlock;
1267                 }
1268                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1269                                                  cda);
1270         }
1271
1272 out_unlock:
1273         spin_unlock_bh(&nf_conntrack_lock);
1274         return err;
1275 }
1276
1277 /***********************************************************************
1278  * EXPECT
1279  ***********************************************************************/
1280
1281 static inline int
1282 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1283                          const struct nf_conntrack_tuple *tuple,
1284                          enum ctattr_expect type)
1285 {
1286         struct nlattr *nest_parms;
1287
1288         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1289         if (!nest_parms)
1290                 goto nla_put_failure;
1291         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1292                 goto nla_put_failure;
1293         nla_nest_end(skb, nest_parms);
1294
1295         return 0;
1296
1297 nla_put_failure:
1298         return -1;
1299 }
1300
1301 static inline int
1302 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1303                         const struct nf_conntrack_tuple *tuple,
1304                         const struct nf_conntrack_tuple_mask *mask)
1305 {
1306         int ret;
1307         struct nf_conntrack_l3proto *l3proto;
1308         struct nf_conntrack_l4proto *l4proto;
1309         struct nf_conntrack_tuple m;
1310         struct nlattr *nest_parms;
1311
1312         memset(&m, 0xFF, sizeof(m));
1313         m.src.u.all = mask->src.u.all;
1314         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1315
1316         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1317         if (!nest_parms)
1318                 goto nla_put_failure;
1319
1320         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1321         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1322         nf_ct_l3proto_put(l3proto);
1323
1324         if (unlikely(ret < 0))
1325                 goto nla_put_failure;
1326
1327         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1328         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1329         nf_ct_l4proto_put(l4proto);
1330         if (unlikely(ret < 0))
1331                 goto nla_put_failure;
1332
1333         nla_nest_end(skb, nest_parms);
1334
1335         return 0;
1336
1337 nla_put_failure:
1338         return -1;
1339 }
1340
1341 static int
1342 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1343                           const struct nf_conntrack_expect *exp)
1344 {
1345         struct nf_conn *master = exp->master;
1346         long timeout = (exp->timeout.expires - jiffies) / HZ;
1347
1348         if (timeout < 0)
1349                 timeout = 0;
1350
1351         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1352                 goto nla_put_failure;
1353         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1354                 goto nla_put_failure;
1355         if (ctnetlink_exp_dump_tuple(skb,
1356                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1357                                  CTA_EXPECT_MASTER) < 0)
1358                 goto nla_put_failure;
1359
1360         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1361         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1362
1363         return 0;
1364
1365 nla_put_failure:
1366         return -1;
1367 }
1368
1369 static int
1370 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1371                     int event,
1372                     int nowait,
1373                     const struct nf_conntrack_expect *exp)
1374 {
1375         struct nlmsghdr *nlh;
1376         struct nfgenmsg *nfmsg;
1377         unsigned char *b = skb_tail_pointer(skb);
1378
1379         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1380         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1381         nfmsg  = NLMSG_DATA(nlh);
1382
1383         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1384         nfmsg->nfgen_family = exp->tuple.src.l3num;
1385         nfmsg->version      = NFNETLINK_V0;
1386         nfmsg->res_id       = 0;
1387
1388         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1389                 goto nla_put_failure;
1390
1391         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1392         return skb->len;
1393
1394 nlmsg_failure:
1395 nla_put_failure:
1396         nlmsg_trim(skb, b);
1397         return -1;
1398 }
1399
1400 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1401 static int ctnetlink_expect_event(struct notifier_block *this,
1402                                   unsigned long events, void *ptr)
1403 {
1404         struct nlmsghdr *nlh;
1405         struct nfgenmsg *nfmsg;
1406         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1407         struct sk_buff *skb;
1408         unsigned int type;
1409         sk_buff_data_t b;
1410         int flags = 0;
1411
1412         if (events & IPEXP_NEW) {
1413                 type = IPCTNL_MSG_EXP_NEW;
1414                 flags = NLM_F_CREATE|NLM_F_EXCL;
1415         } else
1416                 return NOTIFY_DONE;
1417
1418         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1419                 return NOTIFY_DONE;
1420
1421         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1422         if (!skb)
1423                 return NOTIFY_DONE;
1424
1425         b = skb->tail;
1426
1427         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1428         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1429         nfmsg = NLMSG_DATA(nlh);
1430
1431         nlh->nlmsg_flags    = flags;
1432         nfmsg->nfgen_family = exp->tuple.src.l3num;
1433         nfmsg->version      = NFNETLINK_V0;
1434         nfmsg->res_id       = 0;
1435
1436         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1437                 goto nla_put_failure;
1438
1439         nlh->nlmsg_len = skb->tail - b;
1440         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1441         return NOTIFY_DONE;
1442
1443 nlmsg_failure:
1444 nla_put_failure:
1445         kfree_skb(skb);
1446         return NOTIFY_DONE;
1447 }
1448 #endif
1449 static int ctnetlink_exp_done(struct netlink_callback *cb)
1450 {
1451         if (cb->args[1])
1452                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1453         return 0;
1454 }
1455
1456 static int
1457 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1458 {
1459         struct nf_conntrack_expect *exp, *last;
1460         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1461         struct hlist_node *n;
1462         u_int8_t l3proto = nfmsg->nfgen_family;
1463
1464         rcu_read_lock();
1465         last = (struct nf_conntrack_expect *)cb->args[1];
1466         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1467 restart:
1468                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1469                                      hnode) {
1470                         if (l3proto && exp->tuple.src.l3num != l3proto)
1471                                 continue;
1472                         if (cb->args[1]) {
1473                                 if (exp != last)
1474                                         continue;
1475                                 cb->args[1] = 0;
1476                         }
1477                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1478                                                     cb->nlh->nlmsg_seq,
1479                                                     IPCTNL_MSG_EXP_NEW,
1480                                                     1, exp) < 0) {
1481                                 if (!atomic_inc_not_zero(&exp->use))
1482                                         continue;
1483                                 cb->args[1] = (unsigned long)exp;
1484                                 goto out;
1485                         }
1486                 }
1487                 if (cb->args[1]) {
1488                         cb->args[1] = 0;
1489                         goto restart;
1490                 }
1491         }
1492 out:
1493         rcu_read_unlock();
1494         if (last)
1495                 nf_ct_expect_put(last);
1496
1497         return skb->len;
1498 }
1499
1500 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1501         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1502         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1503 };
1504
1505 static int
1506 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1507                      struct nlmsghdr *nlh, struct nlattr *cda[])
1508 {
1509         struct nf_conntrack_tuple tuple;
1510         struct nf_conntrack_expect *exp;
1511         struct sk_buff *skb2;
1512         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1513         u_int8_t u3 = nfmsg->nfgen_family;
1514         int err = 0;
1515
1516         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1517                 return netlink_dump_start(ctnl, skb, nlh,
1518                                           ctnetlink_exp_dump_table,
1519                                           ctnetlink_exp_done);
1520         }
1521
1522         if (cda[CTA_EXPECT_MASTER])
1523                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1524         else
1525                 return -EINVAL;
1526
1527         if (err < 0)
1528                 return err;
1529
1530         exp = nf_ct_expect_find_get(&tuple);
1531         if (!exp)
1532                 return -ENOENT;
1533
1534         if (cda[CTA_EXPECT_ID]) {
1535                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1536                 if (ntohl(id) != (u32)(unsigned long)exp) {
1537                         nf_ct_expect_put(exp);
1538                         return -ENOENT;
1539                 }
1540         }
1541
1542         err = -ENOMEM;
1543         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1544         if (!skb2)
1545                 goto out;
1546
1547         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1548                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1549                                       1, exp);
1550         if (err <= 0)
1551                 goto free;
1552
1553         nf_ct_expect_put(exp);
1554
1555         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1556
1557 free:
1558         kfree_skb(skb2);
1559 out:
1560         nf_ct_expect_put(exp);
1561         return err;
1562 }
1563
1564 static int
1565 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1566                      struct nlmsghdr *nlh, struct nlattr *cda[])
1567 {
1568         struct nf_conntrack_expect *exp;
1569         struct nf_conntrack_tuple tuple;
1570         struct nf_conntrack_helper *h;
1571         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1572         struct hlist_node *n, *next;
1573         u_int8_t u3 = nfmsg->nfgen_family;
1574         unsigned int i;
1575         int err;
1576
1577         if (cda[CTA_EXPECT_TUPLE]) {
1578                 /* delete a single expect by tuple */
1579                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1580                 if (err < 0)
1581                         return err;
1582
1583                 /* bump usage count to 2 */
1584                 exp = nf_ct_expect_find_get(&tuple);
1585                 if (!exp)
1586                         return -ENOENT;
1587
1588                 if (cda[CTA_EXPECT_ID]) {
1589                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1590                         if (ntohl(id) != (u32)(unsigned long)exp) {
1591                                 nf_ct_expect_put(exp);
1592                                 return -ENOENT;
1593                         }
1594                 }
1595
1596                 /* after list removal, usage count == 1 */
1597                 nf_ct_unexpect_related(exp);
1598                 /* have to put what we 'get' above.
1599                  * after this line usage count == 0 */
1600                 nf_ct_expect_put(exp);
1601         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1602                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1603                 struct nf_conn_help *m_help;
1604
1605                 /* delete all expectations for this helper */
1606                 spin_lock_bh(&nf_conntrack_lock);
1607                 h = __nf_conntrack_helper_find_byname(name);
1608                 if (!h) {
1609                         spin_unlock_bh(&nf_conntrack_lock);
1610                         return -EOPNOTSUPP;
1611                 }
1612                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1613                         hlist_for_each_entry_safe(exp, n, next,
1614                                                   &nf_ct_expect_hash[i],
1615                                                   hnode) {
1616                                 m_help = nfct_help(exp->master);
1617                                 if (m_help->helper == h
1618                                     && del_timer(&exp->timeout)) {
1619                                         nf_ct_unlink_expect(exp);
1620                                         nf_ct_expect_put(exp);
1621                                 }
1622                         }
1623                 }
1624                 spin_unlock_bh(&nf_conntrack_lock);
1625         } else {
1626                 /* This basically means we have to flush everything*/
1627                 spin_lock_bh(&nf_conntrack_lock);
1628                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1629                         hlist_for_each_entry_safe(exp, n, next,
1630                                                   &nf_ct_expect_hash[i],
1631                                                   hnode) {
1632                                 if (del_timer(&exp->timeout)) {
1633                                         nf_ct_unlink_expect(exp);
1634                                         nf_ct_expect_put(exp);
1635                                 }
1636                         }
1637                 }
1638                 spin_unlock_bh(&nf_conntrack_lock);
1639         }
1640
1641         return 0;
1642 }
1643 static int
1644 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1645 {
1646         return -EOPNOTSUPP;
1647 }
1648
1649 static int
1650 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1651 {
1652         struct nf_conntrack_tuple tuple, mask, master_tuple;
1653         struct nf_conntrack_tuple_hash *h = NULL;
1654         struct nf_conntrack_expect *exp;
1655         struct nf_conn *ct;
1656         struct nf_conn_help *help;
1657         int err = 0;
1658
1659         /* caller guarantees that those three CTA_EXPECT_* exist */
1660         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1661         if (err < 0)
1662                 return err;
1663         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1664         if (err < 0)
1665                 return err;
1666         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1667         if (err < 0)
1668                 return err;
1669
1670         /* Look for master conntrack of this expectation */
1671         h = nf_conntrack_find_get(&master_tuple);
1672         if (!h)
1673                 return -ENOENT;
1674         ct = nf_ct_tuplehash_to_ctrack(h);
1675         help = nfct_help(ct);
1676
1677         if (!help || !help->helper) {
1678                 /* such conntrack hasn't got any helper, abort */
1679                 err = -EINVAL;
1680                 goto out;
1681         }
1682
1683         exp = nf_ct_expect_alloc(ct);
1684         if (!exp) {
1685                 err = -ENOMEM;
1686                 goto out;
1687         }
1688
1689         exp->expectfn = NULL;
1690         exp->flags = 0;
1691         exp->master = ct;
1692         exp->helper = NULL;
1693         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1694         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1695         exp->mask.src.u.all = mask.src.u.all;
1696
1697         err = nf_ct_expect_related(exp);
1698         nf_ct_expect_put(exp);
1699
1700 out:
1701         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1702         return err;
1703 }
1704
1705 static int
1706 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1707                      struct nlmsghdr *nlh, struct nlattr *cda[])
1708 {
1709         struct nf_conntrack_tuple tuple;
1710         struct nf_conntrack_expect *exp;
1711         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1712         u_int8_t u3 = nfmsg->nfgen_family;
1713         int err = 0;
1714
1715         if (!cda[CTA_EXPECT_TUPLE]
1716             || !cda[CTA_EXPECT_MASK]
1717             || !cda[CTA_EXPECT_MASTER])
1718                 return -EINVAL;
1719
1720         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1721         if (err < 0)
1722                 return err;
1723
1724         spin_lock_bh(&nf_conntrack_lock);
1725         exp = __nf_ct_expect_find(&tuple);
1726
1727         if (!exp) {
1728                 spin_unlock_bh(&nf_conntrack_lock);
1729                 err = -ENOENT;
1730                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1731                         err = ctnetlink_create_expect(cda, u3);
1732                 return err;
1733         }
1734
1735         err = -EEXIST;
1736         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1737                 err = ctnetlink_change_expect(exp, cda);
1738         spin_unlock_bh(&nf_conntrack_lock);
1739
1740         return err;
1741 }
1742
1743 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1744 static struct notifier_block ctnl_notifier = {
1745         .notifier_call  = ctnetlink_conntrack_event,
1746 };
1747
1748 static struct notifier_block ctnl_notifier_exp = {
1749         .notifier_call  = ctnetlink_expect_event,
1750 };
1751 #endif
1752
1753 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1754         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1755                                             .attr_count = CTA_MAX,
1756                                             .policy = ct_nla_policy },
1757         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1758                                             .attr_count = CTA_MAX,
1759                                             .policy = ct_nla_policy },
1760         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1761                                             .attr_count = CTA_MAX,
1762                                             .policy = ct_nla_policy },
1763         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1764                                             .attr_count = CTA_MAX,
1765                                             .policy = ct_nla_policy },
1766 };
1767
1768 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1769         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1770                                             .attr_count = CTA_EXPECT_MAX,
1771                                             .policy = exp_nla_policy },
1772         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1773                                             .attr_count = CTA_EXPECT_MAX,
1774                                             .policy = exp_nla_policy },
1775         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1776                                             .attr_count = CTA_EXPECT_MAX,
1777                                             .policy = exp_nla_policy },
1778 };
1779
1780 static const struct nfnetlink_subsystem ctnl_subsys = {
1781         .name                           = "conntrack",
1782         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1783         .cb_count                       = IPCTNL_MSG_MAX,
1784         .cb                             = ctnl_cb,
1785 };
1786
1787 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1788         .name                           = "conntrack_expect",
1789         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1790         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1791         .cb                             = ctnl_exp_cb,
1792 };
1793
1794 MODULE_ALIAS("ip_conntrack_netlink");
1795 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1796 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1797
1798 static int __init ctnetlink_init(void)
1799 {
1800         int ret;
1801
1802         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1803         ret = nfnetlink_subsys_register(&ctnl_subsys);
1804         if (ret < 0) {
1805                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1806                 goto err_out;
1807         }
1808
1809         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1810         if (ret < 0) {
1811                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1812                 goto err_unreg_subsys;
1813         }
1814
1815 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1816         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1817         if (ret < 0) {
1818                 printk("ctnetlink_init: cannot register notifier.\n");
1819                 goto err_unreg_exp_subsys;
1820         }
1821
1822         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1823         if (ret < 0) {
1824                 printk("ctnetlink_init: cannot expect register notifier.\n");
1825                 goto err_unreg_notifier;
1826         }
1827 #endif
1828
1829         return 0;
1830
1831 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1832 err_unreg_notifier:
1833         nf_conntrack_unregister_notifier(&ctnl_notifier);
1834 err_unreg_exp_subsys:
1835         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1836 #endif
1837 err_unreg_subsys:
1838         nfnetlink_subsys_unregister(&ctnl_subsys);
1839 err_out:
1840         return ret;
1841 }
1842
1843 static void __exit ctnetlink_exit(void)
1844 {
1845         printk("ctnetlink: unregistering from nfnetlink.\n");
1846
1847 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1848         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1849         nf_conntrack_unregister_notifier(&ctnl_notifier);
1850 #endif
1851
1852         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1853         nfnetlink_subsys_unregister(&ctnl_subsys);
1854         return;
1855 }
1856
1857 module_init(ctnetlink_init);
1858 module_exit(ctnetlink_exit);