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) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/timer.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/errno.h>
  25 #include <linux/netlink.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/notifier.h>
  29
  30 #include <linux/netfilter.h>
  31 #include <net/netlink.h>
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_core.h>
  34 #include <net/netfilter/nf_conntrack_expect.h>
  35 #include <net/netfilter/nf_conntrack_helper.h>
  36 #include <net/netfilter/nf_conntrack_l3proto.h>
  37 #include <net/netfilter/nf_conntrack_l4proto.h>
  38 #include <net/netfilter/nf_conntrack_tuple.h>
  39 #ifdef CONFIG_NF_NAT_NEEDED
  40 #include <net/netfilter/nf_nat_core.h>
  41 #include <net/netfilter/nf_nat_protocol.h>
  42 #endif
  43
  44 #include <linux/netfilter/nfnetlink.h>
  45 #include <linux/netfilter/nfnetlink_conntrack.h>
  46
  47 MODULE_LICENSE("GPL");
  48
  49 static char __initdata version[] = "0.93";
  50
  51 static inline int
  52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  53                             const struct nf_conntrack_tuple *tuple,
  54                             struct nf_conntrack_l4proto *l4proto)
  55 {
  56         int ret = 0;
  57         struct nlattr *nest_parms;
  58
  59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  60         if (!nest_parms)
  61                 goto nla_put_failure;
  62         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  63
  64         if (likely(l4proto->tuple_to_nlattr))
  65                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  66
  67         nla_nest_end(skb, nest_parms);
  68
  69         return ret;
  70
  71 nla_put_failure:
  72         return -1;
  73 }
  74
  75 static inline int
  76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  77                          const struct nf_conntrack_tuple *tuple,
  78                          struct nf_conntrack_l3proto *l3proto)
  79 {
  80         int ret = 0;
  81         struct nlattr *nest_parms;
  82
  83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  84         if (!nest_parms)
  85                 goto nla_put_failure;
  86
  87         if (likely(l3proto->tuple_to_nlattr))
  88                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  89
  90         nla_nest_end(skb, nest_parms);
  91
  92         return ret;
  93
  94 nla_put_failure:
  95         return -1;
  96 }
  97
  98 static int
  99 ctnetlink_dump_tuples(struct sk_buff *skb,
 100                       const struct nf_conntrack_tuple *tuple)
 101 {
 102         int ret;
 103         struct nf_conntrack_l3proto *l3proto;
 104         struct nf_conntrack_l4proto *l4proto;
 105
 106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 108         nf_ct_l3proto_put(l3proto);
 109
 110         if (unlikely(ret < 0))
 111                 return ret;
 112
 113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 115         nf_ct_l4proto_put(l4proto);
 116
 117         return ret;
 118 }
 119
 120 static inline int
 121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 122 {
 123         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 124         return 0;
 125
 126 nla_put_failure:
 127         return -1;
 128 }
 129
 130 static inline int
 131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 132 {
 133         long timeout = (ct->timeout.expires - jiffies) / HZ;
 134
 135         if (timeout < 0)
 136                 timeout = 0;
 137
 138         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 139         return 0;
 140
 141 nla_put_failure:
 142         return -1;
 143 }
 144
 145 static inline int
 146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 147 {
 148         struct nf_conntrack_l4proto *l4proto;
 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 (events & IPCT_DESTROY) {
 476                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 477                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 478                         goto nla_put_failure;
 479         } else {
 480                 if (ctnetlink_dump_status(skb, ct) < 0)
 481                         goto nla_put_failure;
 482
 483                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 484                         goto nla_put_failure;
 485
 486                 if (events & IPCT_PROTOINFO
 487                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 488                         goto nla_put_failure;
 489
 490                 if ((events & IPCT_HELPER || nfct_help(ct))
 491                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 492                         goto nla_put_failure;
 493
 494 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 495                 if ((events & IPCT_SECMARK || ct->secmark)
 496                     && ctnetlink_dump_secmark(skb, ct) < 0)
 497                         goto nla_put_failure;
 498 #endif
 499
 500                 if (events & IPCT_COUNTER_FILLING &&
 501                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 502                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 503                         goto nla_put_failure;
 504
 505                 if (events & IPCT_RELATED &&
 506                     ctnetlink_dump_master(skb, ct) < 0)
 507                         goto nla_put_failure;
 508
 509                 if (events & IPCT_NATSEQADJ &&
 510                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 511                         goto nla_put_failure;
 512         }
 513
 514 #ifdef CONFIG_NF_CONNTRACK_MARK
 515         if ((events & IPCT_MARK || ct->mark)
 516             && ctnetlink_dump_mark(skb, ct) < 0)
 517                 goto nla_put_failure;
 518 #endif
 519
 520         nlh->nlmsg_len = skb->tail - b;
 521         nfnetlink_send(skb, 0, group, 0);
 522         return NOTIFY_DONE;
 523
 524 nlmsg_failure:
 525 nla_put_failure:
 526         kfree_skb(skb);
 527         return NOTIFY_DONE;
 528 }
 529 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 530
 531 static int ctnetlink_done(struct netlink_callback *cb)
 532 {
 533         if (cb->args[1])
 534                 nf_ct_put((struct nf_conn *)cb->args[1]);
 535         return 0;
 536 }
 537
 538 static int
 539 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 540 {
 541         struct nf_conn *ct, *last;
 542         struct nf_conntrack_tuple_hash *h;
 543         struct hlist_node *n;
 544         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 545         u_int8_t l3proto = nfmsg->nfgen_family;
 546
 547         rcu_read_lock();
 548         last = (struct nf_conn *)cb->args[1];
 549         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 550 restart:
 551                 hlist_for_each_entry_rcu(h, n, &nf_conntrack_hash[cb->args[0]],
 552                                          hnode) {
 553                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 554                                 continue;
 555                         ct = nf_ct_tuplehash_to_ctrack(h);
 556                         /* Dump entries of a given L3 protocol number.
 557                          * If it is not specified, ie. l3proto == 0,
 558                          * then dump everything. */
 559                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 560                                 continue;
 561                         if (cb->args[1]) {
 562                                 if (ct != last)
 563                                         continue;
 564                                 cb->args[1] = 0;
 565                         }
 566                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 567                                                 cb->nlh->nlmsg_seq,
 568                                                 IPCTNL_MSG_CT_NEW,
 569                                                 1, ct) < 0) {
 570                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
 571                                         continue;
 572                                 cb->args[1] = (unsigned long)ct;
 573                                 goto out;
 574                         }
 575 #ifdef CONFIG_NF_CT_ACCT
 576                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 577                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 578                                 memset(&ct->counters, 0, sizeof(ct->counters));
 579 #endif
 580                 }
 581                 if (cb->args[1]) {
 582                         cb->args[1] = 0;
 583                         goto restart;
 584                 }
 585         }
 586 out:
 587         rcu_read_unlock();
 588         if (last)
 589                 nf_ct_put(last);
 590
 591         return skb->len;
 592 }
 593
 594 static inline int
 595 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 596 {
 597         struct nlattr *tb[CTA_IP_MAX+1];
 598         struct nf_conntrack_l3proto *l3proto;
 599         int ret = 0;
 600
 601         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 602
 603         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 604
 605         if (likely(l3proto->nlattr_to_tuple)) {
 606                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 607                                           l3proto->nla_policy);
 608                 if (ret == 0)
 609                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 610         }
 611
 612         nf_ct_l3proto_put(l3proto);
 613
 614         return ret;
 615 }
 616
 617 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 618         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 619 };
 620
 621 static inline int
 622 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 623                             struct nf_conntrack_tuple *tuple)
 624 {
 625         struct nlattr *tb[CTA_PROTO_MAX+1];
 626         struct nf_conntrack_l4proto *l4proto;
 627         int ret = 0;
 628
 629         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 630         if (ret < 0)
 631                 return ret;
 632
 633         if (!tb[CTA_PROTO_NUM])
 634                 return -EINVAL;
 635         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 636
 637         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 638
 639         if (likely(l4proto->nlattr_to_tuple)) {
 640                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 641                                           l4proto->nla_policy);
 642                 if (ret == 0)
 643                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 644         }
 645
 646         nf_ct_l4proto_put(l4proto);
 647
 648         return ret;
 649 }
 650
 651 static int
 652 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 653                       enum ctattr_tuple type, u_int8_t l3num)
 654 {
 655         struct nlattr *tb[CTA_TUPLE_MAX+1];
 656         int err;
 657
 658         memset(tuple, 0, sizeof(*tuple));
 659
 660         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 661
 662         if (!tb[CTA_TUPLE_IP])
 663                 return -EINVAL;
 664
 665         tuple->src.l3num = l3num;
 666
 667         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 668         if (err < 0)
 669                 return err;
 670
 671         if (!tb[CTA_TUPLE_PROTO])
 672                 return -EINVAL;
 673
 674         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 675         if (err < 0)
 676                 return err;
 677
 678         /* orig and expect tuples get DIR_ORIGINAL */
 679         if (type == CTA_TUPLE_REPLY)
 680                 tuple->dst.dir = IP_CT_DIR_REPLY;
 681         else
 682                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 683
 684         return 0;
 685 }
 686
 687 #ifdef CONFIG_NF_NAT_NEEDED
 688 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
 689         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
 690         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
 691 };
 692
 693 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 694                                      const struct nf_conn *ct,
 695                                      struct nf_nat_range *range)
 696 {
 697         struct nlattr *tb[CTA_PROTONAT_MAX+1];
 698         const struct nf_nat_protocol *npt;
 699         int err;
 700
 701         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
 702         if (err < 0)
 703                 return err;
 704
 705         npt = nf_nat_proto_find_get(nf_ct_protonum(ct));
 706         if (npt->nlattr_to_range)
 707                 err = npt->nlattr_to_range(tb, range);
 708         nf_nat_proto_put(npt);
 709         return err;
 710 }
 711
 712 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
 713         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
 714         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
 715 };
 716
 717 static inline int
 718 nfnetlink_parse_nat(struct nlattr *nat,
 719                     const struct nf_conn *ct, struct nf_nat_range *range)
 720 {
 721         struct nlattr *tb[CTA_NAT_MAX+1];
 722         int err;
 723
 724         memset(range, 0, sizeof(*range));
 725
 726         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
 727         if (err < 0)
 728                 return err;
 729
 730         if (tb[CTA_NAT_MINIP])
 731                 range->min_ip = nla_get_be32(tb[CTA_NAT_MINIP]);
 732
 733         if (!tb[CTA_NAT_MAXIP])
 734                 range->max_ip = range->min_ip;
 735         else
 736                 range->max_ip = nla_get_be32(tb[CTA_NAT_MAXIP]);
 737
 738         if (range->min_ip)
 739                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 740
 741         if (!tb[CTA_NAT_PROTO])
 742                 return 0;
 743
 744         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
 745         if (err < 0)
 746                 return err;
 747
 748         return 0;
 749 }
 750 #endif
 751
 752 static inline int
 753 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 754 {
 755         struct nlattr *tb[CTA_HELP_MAX+1];
 756
 757         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 758
 759         if (!tb[CTA_HELP_NAME])
 760                 return -EINVAL;
 761
 762         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 763
 764         return 0;
 765 }
 766
 767 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 768         [CTA_STATUS]            = { .type = NLA_U32 },
 769         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 770         [CTA_MARK]              = { .type = NLA_U32 },
 771         [CTA_USE]               = { .type = NLA_U32 },
 772         [CTA_ID]                = { .type = NLA_U32 },
 773 };
 774
 775 static int
 776 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 777                         struct nlmsghdr *nlh, struct nlattr *cda[])
 778 {
 779         struct nf_conntrack_tuple_hash *h;
 780         struct nf_conntrack_tuple tuple;
 781         struct nf_conn *ct;
 782         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 783         u_int8_t u3 = nfmsg->nfgen_family;
 784         int err = 0;
 785
 786         if (cda[CTA_TUPLE_ORIG])
 787                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 788         else if (cda[CTA_TUPLE_REPLY])
 789                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 790         else {
 791                 /* Flush the whole table */
 792                 nf_conntrack_flush();
 793                 return 0;
 794         }
 795
 796         if (err < 0)
 797                 return err;
 798
 799         h = nf_conntrack_find_get(&tuple);
 800         if (!h)
 801                 return -ENOENT;
 802
 803         ct = nf_ct_tuplehash_to_ctrack(h);
 804
 805         if (cda[CTA_ID]) {
 806                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 807                 if (id != (u32)(unsigned long)ct) {
 808                         nf_ct_put(ct);
 809                         return -ENOENT;
 810                 }
 811         }
 812         if (del_timer(&ct->timeout))
 813                 ct->timeout.function((unsigned long)ct);
 814
 815         nf_ct_put(ct);
 816
 817         return 0;
 818 }
 819
 820 static int
 821 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 822                         struct nlmsghdr *nlh, struct nlattr *cda[])
 823 {
 824         struct nf_conntrack_tuple_hash *h;
 825         struct nf_conntrack_tuple tuple;
 826         struct nf_conn *ct;
 827         struct sk_buff *skb2 = NULL;
 828         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 829         u_int8_t u3 = nfmsg->nfgen_family;
 830         int err = 0;
 831
 832         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 833 #ifndef CONFIG_NF_CT_ACCT
 834                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 835                         return -ENOTSUPP;
 836 #endif
 837                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 838                                           ctnetlink_done);
 839         }
 840
 841         if (cda[CTA_TUPLE_ORIG])
 842                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 843         else if (cda[CTA_TUPLE_REPLY])
 844                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 845         else
 846                 return -EINVAL;
 847
 848         if (err < 0)
 849                 return err;
 850
 851         h = nf_conntrack_find_get(&tuple);
 852         if (!h)
 853                 return -ENOENT;
 854
 855         ct = nf_ct_tuplehash_to_ctrack(h);
 856
 857         err = -ENOMEM;
 858         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 859         if (!skb2) {
 860                 nf_ct_put(ct);
 861                 return -ENOMEM;
 862         }
 863
 864         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 865                                   IPCTNL_MSG_CT_NEW, 1, ct);
 866         nf_ct_put(ct);
 867         if (err <= 0)
 868                 goto free;
 869
 870         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 871         if (err < 0)
 872                 goto out;
 873
 874         return 0;
 875
 876 free:
 877         kfree_skb(skb2);
 878 out:
 879         return err;
 880 }
 881
 882 static int
 883 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 884 {
 885         unsigned long d;
 886         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 887         d = ct->status ^ status;
 888
 889         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 890                 /* unchangeable */
 891                 return -EINVAL;
 892
 893         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 894                 /* SEEN_REPLY bit can only be set */
 895                 return -EINVAL;
 896
 897
 898         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 899                 /* ASSURED bit can only be set */
 900                 return -EINVAL;
 901
 902         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 903 #ifndef CONFIG_NF_NAT_NEEDED
 904                 return -EINVAL;
 905 #else
 906                 struct nf_nat_range range;
 907
 908                 if (cda[CTA_NAT_DST]) {
 909                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 910                                                 &range) < 0)
 911                                 return -EINVAL;
 912                         if (nf_nat_initialized(ct, IP_NAT_MANIP_DST))
 913                                 return -EEXIST;
 914                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_DST);
 915                 }
 916                 if (cda[CTA_NAT_SRC]) {
 917                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 918                                                 &range) < 0)
 919                                 return -EINVAL;
 920                         if (nf_nat_initialized(ct, IP_NAT_MANIP_SRC))
 921                                 return -EEXIST;
 922                         nf_nat_setup_info(ct, &range, IP_NAT_MANIP_SRC);
 923                 }
 924 #endif
 925         }
 926
 927         /* Be careful here, modifying NAT bits can screw up things,
 928          * so don't let users modify them directly if they don't pass
 929          * nf_nat_range. */
 930         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 931         return 0;
 932 }
 933
 934
 935 static inline int
 936 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 937 {
 938         struct nf_conntrack_helper *helper;
 939         struct nf_conn_help *help = nfct_help(ct);
 940         char *helpname;
 941         int err;
 942
 943         /* don't change helper of sibling connections */
 944         if (ct->master)
 945                 return -EINVAL;
 946
 947         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 948         if (err < 0)
 949                 return err;
 950
 951         if (!strcmp(helpname, "")) {
 952                 if (help && help->helper) {
 953                         /* we had a helper before ... */
 954                         nf_ct_remove_expectations(ct);
 955                         rcu_assign_pointer(help->helper, NULL);
 956                 }
 957
 958                 return 0;
 959         }
 960
 961         helper = __nf_conntrack_helper_find_byname(helpname);
 962         if (helper == NULL)
 963                 return -EINVAL;
 964
 965         if (help) {
 966                 if (help->helper == helper)
 967                         return 0;
 968                 if (help->helper)
 969                         return -EBUSY;
 970                 /* need to zero data of old helper */
 971                 memset(&help->help, 0, sizeof(help->help));
 972         } else {
 973                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 974                 if (help == NULL)
 975                         return -ENOMEM;
 976         }
 977
 978         rcu_assign_pointer(help->helper, helper);
 979
 980         return 0;
 981 }
 982
 983 static inline int
 984 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 985 {
 986         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 987
 988         if (!del_timer(&ct->timeout))
 989                 return -ETIME;
 990
 991         ct->timeout.expires = jiffies + timeout * HZ;
 992         add_timer(&ct->timeout);
 993
 994         return 0;
 995 }
 996
 997 static inline int
 998 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 999 {
1000         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1001         struct nf_conntrack_l4proto *l4proto;
1002         int err = 0;
1003
1004         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1005
1006         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
1007         if (l4proto->from_nlattr)
1008                 err = l4proto->from_nlattr(tb, ct);
1009         nf_ct_l4proto_put(l4proto);
1010
1011         return err;
1012 }
1013
1014 #ifdef CONFIG_NF_NAT_NEEDED
1015 static inline int
1016 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1017 {
1018         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1019
1020         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1021
1022         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1023                 return -EINVAL;
1024
1025         natseq->correction_pos =
1026                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1027
1028         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1029                 return -EINVAL;
1030
1031         natseq->offset_before =
1032                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1033
1034         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1035                 return -EINVAL;
1036
1037         natseq->offset_after =
1038                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1039
1040         return 0;
1041 }
1042
1043 static int
1044 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1045 {
1046         int ret = 0;
1047         struct nf_conn_nat *nat = nfct_nat(ct);
1048
1049         if (!nat)
1050                 return 0;
1051
1052         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1053                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1054                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1055                 if (ret < 0)
1056                         return ret;
1057
1058                 ct->status |= IPS_SEQ_ADJUST;
1059         }
1060
1061         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1062                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1063                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1064                 if (ret < 0)
1065                         return ret;
1066
1067                 ct->status |= IPS_SEQ_ADJUST;
1068         }
1069
1070         return 0;
1071 }
1072 #endif
1073
1074 static int
1075 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1076 {
1077         int err;
1078
1079         if (cda[CTA_HELP]) {
1080                 err = ctnetlink_change_helper(ct, cda);
1081                 if (err < 0)
1082                         return err;
1083         }
1084
1085         if (cda[CTA_TIMEOUT]) {
1086                 err = ctnetlink_change_timeout(ct, cda);
1087                 if (err < 0)
1088                         return err;
1089         }
1090
1091         if (cda[CTA_STATUS]) {
1092                 err = ctnetlink_change_status(ct, cda);
1093                 if (err < 0)
1094                         return err;
1095         }
1096
1097         if (cda[CTA_PROTOINFO]) {
1098                 err = ctnetlink_change_protoinfo(ct, cda);
1099                 if (err < 0)
1100                         return err;
1101         }
1102
1103 #if defined(CONFIG_NF_CONNTRACK_MARK)
1104         if (cda[CTA_MARK])
1105                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1106 #endif
1107
1108 #ifdef CONFIG_NF_NAT_NEEDED
1109         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1110                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1111                 if (err < 0)
1112                         return err;
1113         }
1114 #endif
1115
1116         return 0;
1117 }
1118
1119 static int
1120 ctnetlink_create_conntrack(struct nlattr *cda[],
1121                            struct nf_conntrack_tuple *otuple,
1122                            struct nf_conntrack_tuple *rtuple,
1123                            struct nf_conn *master_ct)
1124 {
1125         struct nf_conn *ct;
1126         int err = -EINVAL;
1127         struct nf_conn_help *help;
1128         struct nf_conntrack_helper *helper;
1129
1130         ct = nf_conntrack_alloc(otuple, rtuple);
1131         if (ct == NULL || IS_ERR(ct))
1132                 return -ENOMEM;
1133
1134         if (!cda[CTA_TIMEOUT])
1135                 goto err;
1136         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1137
1138         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1139         ct->status |= IPS_CONFIRMED;
1140
1141         if (cda[CTA_STATUS]) {
1142                 err = ctnetlink_change_status(ct, cda);
1143                 if (err < 0)
1144                         goto err;
1145         }
1146
1147         if (cda[CTA_PROTOINFO]) {
1148                 err = ctnetlink_change_protoinfo(ct, cda);
1149                 if (err < 0)
1150                         goto err;
1151         }
1152
1153 #if defined(CONFIG_NF_CONNTRACK_MARK)
1154         if (cda[CTA_MARK])
1155                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1156 #endif
1157
1158         rcu_read_lock();
1159         helper = __nf_ct_helper_find(rtuple);
1160         if (helper) {
1161                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1162                 if (help == NULL) {
1163                         rcu_read_unlock();
1164                         err = -ENOMEM;
1165                         goto err;
1166                 }
1167                 /* not in hash table yet so not strictly necessary */
1168                 rcu_assign_pointer(help->helper, helper);
1169         }
1170
1171         /* setup master conntrack: this is a confirmed expectation */
1172         if (master_ct) {
1173                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1174                 ct->master = master_ct;
1175         }
1176
1177         add_timer(&ct->timeout);
1178         nf_conntrack_hash_insert(ct);
1179         rcu_read_unlock();
1180
1181         return 0;
1182
1183 err:
1184         nf_conntrack_free(ct);
1185         return err;
1186 }
1187
1188 static int
1189 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1190                         struct nlmsghdr *nlh, struct nlattr *cda[])
1191 {
1192         struct nf_conntrack_tuple otuple, rtuple;
1193         struct nf_conntrack_tuple_hash *h = NULL;
1194         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1195         u_int8_t u3 = nfmsg->nfgen_family;
1196         int err = 0;
1197
1198         if (cda[CTA_TUPLE_ORIG]) {
1199                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1200                 if (err < 0)
1201                         return err;
1202         }
1203
1204         if (cda[CTA_TUPLE_REPLY]) {
1205                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1206                 if (err < 0)
1207                         return err;
1208         }
1209
1210         spin_lock_bh(&nf_conntrack_lock);
1211         if (cda[CTA_TUPLE_ORIG])
1212                 h = __nf_conntrack_find(&otuple);
1213         else if (cda[CTA_TUPLE_REPLY])
1214                 h = __nf_conntrack_find(&rtuple);
1215
1216         if (h == NULL) {
1217                 struct nf_conntrack_tuple master;
1218                 struct nf_conntrack_tuple_hash *master_h = NULL;
1219                 struct nf_conn *master_ct = NULL;
1220
1221                 if (cda[CTA_TUPLE_MASTER]) {
1222                         err = ctnetlink_parse_tuple(cda,
1223                                                     &master,
1224                                                     CTA_TUPLE_MASTER,
1225                                                     u3);
1226                         if (err < 0)
1227                                 goto out_unlock;
1228
1229                         master_h = __nf_conntrack_find(&master);
1230                         if (master_h == NULL) {
1231                                 err = -ENOENT;
1232                                 goto out_unlock;
1233                         }
1234                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1235                         atomic_inc(&master_ct->ct_general.use);
1236                 }
1237
1238                 spin_unlock_bh(&nf_conntrack_lock);
1239                 err = -ENOENT;
1240                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1241                         err = ctnetlink_create_conntrack(cda,
1242                                                          &otuple,
1243                                                          &rtuple,
1244                                                          master_ct);
1245                 if (err < 0 && master_ct)
1246                         nf_ct_put(master_ct);
1247
1248                 return err;
1249         }
1250         /* implicit 'else' */
1251
1252         /* We manipulate the conntrack inside the global conntrack table lock,
1253          * so there's no need to increase the refcount */
1254         err = -EEXIST;
1255         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1256                 /* we only allow nat config for new conntracks */
1257                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1258                         err = -EINVAL;
1259                         goto out_unlock;
1260                 }
1261                 /* can't link an existing conntrack to a master */
1262                 if (cda[CTA_TUPLE_MASTER]) {
1263                         err = -EINVAL;
1264                         goto out_unlock;
1265                 }
1266                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1267                                                  cda);
1268         }
1269
1270 out_unlock:
1271         spin_unlock_bh(&nf_conntrack_lock);
1272         return err;
1273 }
1274
1275 /***********************************************************************
1276  * EXPECT
1277  ***********************************************************************/
1278
1279 static inline int
1280 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1281                          const struct nf_conntrack_tuple *tuple,
1282                          enum ctattr_expect type)
1283 {
1284         struct nlattr *nest_parms;
1285
1286         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1287         if (!nest_parms)
1288                 goto nla_put_failure;
1289         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1290                 goto nla_put_failure;
1291         nla_nest_end(skb, nest_parms);
1292
1293         return 0;
1294
1295 nla_put_failure:
1296         return -1;
1297 }
1298
1299 static inline int
1300 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1301                         const struct nf_conntrack_tuple *tuple,
1302                         const struct nf_conntrack_tuple_mask *mask)
1303 {
1304         int ret;
1305         struct nf_conntrack_l3proto *l3proto;
1306         struct nf_conntrack_l4proto *l4proto;
1307         struct nf_conntrack_tuple m;
1308         struct nlattr *nest_parms;
1309
1310         memset(&m, 0xFF, sizeof(m));
1311         m.src.u.all = mask->src.u.all;
1312         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1313
1314         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1315         if (!nest_parms)
1316                 goto nla_put_failure;
1317
1318         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1319         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1320         nf_ct_l3proto_put(l3proto);
1321
1322         if (unlikely(ret < 0))
1323                 goto nla_put_failure;
1324
1325         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1326         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1327         nf_ct_l4proto_put(l4proto);
1328         if (unlikely(ret < 0))
1329                 goto nla_put_failure;
1330
1331         nla_nest_end(skb, nest_parms);
1332
1333         return 0;
1334
1335 nla_put_failure:
1336         return -1;
1337 }
1338
1339 static int
1340 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1341                           const struct nf_conntrack_expect *exp)
1342 {
1343         struct nf_conn *master = exp->master;
1344         long timeout = (exp->timeout.expires - jiffies) / HZ;
1345
1346         if (timeout < 0)
1347                 timeout = 0;
1348
1349         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1350                 goto nla_put_failure;
1351         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1352                 goto nla_put_failure;
1353         if (ctnetlink_exp_dump_tuple(skb,
1354                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1355                                  CTA_EXPECT_MASTER) < 0)
1356                 goto nla_put_failure;
1357
1358         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1359         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1360
1361         return 0;
1362
1363 nla_put_failure:
1364         return -1;
1365 }
1366
1367 static int
1368 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1369                     int event,
1370                     int nowait,
1371                     const struct nf_conntrack_expect *exp)
1372 {
1373         struct nlmsghdr *nlh;
1374         struct nfgenmsg *nfmsg;
1375         unsigned char *b = skb_tail_pointer(skb);
1376
1377         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1378         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1379         nfmsg  = NLMSG_DATA(nlh);
1380
1381         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1382         nfmsg->nfgen_family = exp->tuple.src.l3num;
1383         nfmsg->version      = NFNETLINK_V0;
1384         nfmsg->res_id       = 0;
1385
1386         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1387                 goto nla_put_failure;
1388
1389         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1390         return skb->len;
1391
1392 nlmsg_failure:
1393 nla_put_failure:
1394         nlmsg_trim(skb, b);
1395         return -1;
1396 }
1397
1398 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1399 static int ctnetlink_expect_event(struct notifier_block *this,
1400                                   unsigned long events, void *ptr)
1401 {
1402         struct nlmsghdr *nlh;
1403         struct nfgenmsg *nfmsg;
1404         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1405         struct sk_buff *skb;
1406         unsigned int type;
1407         sk_buff_data_t b;
1408         int flags = 0;
1409
1410         if (events & IPEXP_NEW) {
1411                 type = IPCTNL_MSG_EXP_NEW;
1412                 flags = NLM_F_CREATE|NLM_F_EXCL;
1413         } else
1414                 return NOTIFY_DONE;
1415
1416         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1417                 return NOTIFY_DONE;
1418
1419         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1420         if (!skb)
1421                 return NOTIFY_DONE;
1422
1423         b = skb->tail;
1424
1425         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1426         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1427         nfmsg = NLMSG_DATA(nlh);
1428
1429         nlh->nlmsg_flags    = flags;
1430         nfmsg->nfgen_family = exp->tuple.src.l3num;
1431         nfmsg->version      = NFNETLINK_V0;
1432         nfmsg->res_id       = 0;
1433
1434         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1435                 goto nla_put_failure;
1436
1437         nlh->nlmsg_len = skb->tail - b;
1438         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1439         return NOTIFY_DONE;
1440
1441 nlmsg_failure:
1442 nla_put_failure:
1443         kfree_skb(skb);
1444         return NOTIFY_DONE;
1445 }
1446 #endif
1447 static int ctnetlink_exp_done(struct netlink_callback *cb)
1448 {
1449         if (cb->args[1])
1450                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1451         return 0;
1452 }
1453
1454 static int
1455 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1456 {
1457         struct nf_conntrack_expect *exp, *last;
1458         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1459         struct hlist_node *n;
1460         u_int8_t l3proto = nfmsg->nfgen_family;
1461
1462         rcu_read_lock();
1463         last = (struct nf_conntrack_expect *)cb->args[1];
1464         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1465 restart:
1466                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1467                                      hnode) {
1468                         if (l3proto && exp->tuple.src.l3num != l3proto)
1469                                 continue;
1470                         if (cb->args[1]) {
1471                                 if (exp != last)
1472                                         continue;
1473                                 cb->args[1] = 0;
1474                         }
1475                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1476                                                     cb->nlh->nlmsg_seq,
1477                                                     IPCTNL_MSG_EXP_NEW,
1478                                                     1, exp) < 0) {
1479                                 if (!atomic_inc_not_zero(&exp->use))
1480                                         continue;
1481                                 cb->args[1] = (unsigned long)exp;
1482                                 goto out;
1483                         }
1484                 }
1485                 if (cb->args[1]) {
1486                         cb->args[1] = 0;
1487                         goto restart;
1488                 }
1489         }
1490 out:
1491         rcu_read_unlock();
1492         if (last)
1493                 nf_ct_expect_put(last);
1494
1495         return skb->len;
1496 }
1497
1498 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1499         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1500         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1501 };
1502
1503 static int
1504 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1505                      struct nlmsghdr *nlh, struct nlattr *cda[])
1506 {
1507         struct nf_conntrack_tuple tuple;
1508         struct nf_conntrack_expect *exp;
1509         struct sk_buff *skb2;
1510         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1511         u_int8_t u3 = nfmsg->nfgen_family;
1512         int err = 0;
1513
1514         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1515                 return netlink_dump_start(ctnl, skb, nlh,
1516                                           ctnetlink_exp_dump_table,
1517                                           ctnetlink_exp_done);
1518         }
1519
1520         if (cda[CTA_EXPECT_MASTER])
1521                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1522         else
1523                 return -EINVAL;
1524
1525         if (err < 0)
1526                 return err;
1527
1528         exp = nf_ct_expect_find_get(&tuple);
1529         if (!exp)
1530                 return -ENOENT;
1531
1532         if (cda[CTA_EXPECT_ID]) {
1533                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1534                 if (ntohl(id) != (u32)(unsigned long)exp) {
1535                         nf_ct_expect_put(exp);
1536                         return -ENOENT;
1537                 }
1538         }
1539
1540         err = -ENOMEM;
1541         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1542         if (!skb2)
1543                 goto out;
1544
1545         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1546                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1547                                       1, exp);
1548         if (err <= 0)
1549                 goto free;
1550
1551         nf_ct_expect_put(exp);
1552
1553         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1554
1555 free:
1556         kfree_skb(skb2);
1557 out:
1558         nf_ct_expect_put(exp);
1559         return err;
1560 }
1561
1562 static int
1563 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1564                      struct nlmsghdr *nlh, struct nlattr *cda[])
1565 {
1566         struct nf_conntrack_expect *exp;
1567         struct nf_conntrack_tuple tuple;
1568         struct nf_conntrack_helper *h;
1569         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1570         struct hlist_node *n, *next;
1571         u_int8_t u3 = nfmsg->nfgen_family;
1572         unsigned int i;
1573         int err;
1574
1575         if (cda[CTA_EXPECT_TUPLE]) {
1576                 /* delete a single expect by tuple */
1577                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1578                 if (err < 0)
1579                         return err;
1580
1581                 /* bump usage count to 2 */
1582                 exp = nf_ct_expect_find_get(&tuple);
1583                 if (!exp)
1584                         return -ENOENT;
1585
1586                 if (cda[CTA_EXPECT_ID]) {
1587                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1588                         if (ntohl(id) != (u32)(unsigned long)exp) {
1589                                 nf_ct_expect_put(exp);
1590                                 return -ENOENT;
1591                         }
1592                 }
1593
1594                 /* after list removal, usage count == 1 */
1595                 nf_ct_unexpect_related(exp);
1596                 /* have to put what we 'get' above.
1597                  * after this line usage count == 0 */
1598                 nf_ct_expect_put(exp);
1599         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1600                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1601                 struct nf_conn_help *m_help;
1602
1603                 /* delete all expectations for this helper */
1604                 spin_lock_bh(&nf_conntrack_lock);
1605                 h = __nf_conntrack_helper_find_byname(name);
1606                 if (!h) {
1607                         spin_unlock_bh(&nf_conntrack_lock);
1608                         return -EINVAL;
1609                 }
1610                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1611                         hlist_for_each_entry_safe(exp, n, next,
1612                                                   &nf_ct_expect_hash[i],
1613                                                   hnode) {
1614                                 m_help = nfct_help(exp->master);
1615                                 if (m_help->helper == h
1616                                     && del_timer(&exp->timeout)) {
1617                                         nf_ct_unlink_expect(exp);
1618                                         nf_ct_expect_put(exp);
1619                                 }
1620                         }
1621                 }
1622                 spin_unlock_bh(&nf_conntrack_lock);
1623         } else {
1624                 /* This basically means we have to flush everything*/
1625                 spin_lock_bh(&nf_conntrack_lock);
1626                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1627                         hlist_for_each_entry_safe(exp, n, next,
1628                                                   &nf_ct_expect_hash[i],
1629                                                   hnode) {
1630                                 if (del_timer(&exp->timeout)) {
1631                                         nf_ct_unlink_expect(exp);
1632                                         nf_ct_expect_put(exp);
1633                                 }
1634                         }
1635                 }
1636                 spin_unlock_bh(&nf_conntrack_lock);
1637         }
1638
1639         return 0;
1640 }
1641 static int
1642 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1643 {
1644         return -EOPNOTSUPP;
1645 }
1646
1647 static int
1648 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1649 {
1650         struct nf_conntrack_tuple tuple, mask, master_tuple;
1651         struct nf_conntrack_tuple_hash *h = NULL;
1652         struct nf_conntrack_expect *exp;
1653         struct nf_conn *ct;
1654         struct nf_conn_help *help;
1655         int err = 0;
1656
1657         /* caller guarantees that those three CTA_EXPECT_* exist */
1658         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1659         if (err < 0)
1660                 return err;
1661         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1662         if (err < 0)
1663                 return err;
1664         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1665         if (err < 0)
1666                 return err;
1667
1668         /* Look for master conntrack of this expectation */
1669         h = nf_conntrack_find_get(&master_tuple);
1670         if (!h)
1671                 return -ENOENT;
1672         ct = nf_ct_tuplehash_to_ctrack(h);
1673         help = nfct_help(ct);
1674
1675         if (!help || !help->helper) {
1676                 /* such conntrack hasn't got any helper, abort */
1677                 err = -EINVAL;
1678                 goto out;
1679         }
1680
1681         exp = nf_ct_expect_alloc(ct);
1682         if (!exp) {
1683                 err = -ENOMEM;
1684                 goto out;
1685         }
1686
1687         exp->expectfn = NULL;
1688         exp->flags = 0;
1689         exp->master = ct;
1690         exp->helper = NULL;
1691         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1692         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1693         exp->mask.src.u.all = mask.src.u.all;
1694
1695         err = nf_ct_expect_related(exp);
1696         nf_ct_expect_put(exp);
1697
1698 out:
1699         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1700         return err;
1701 }
1702
1703 static int
1704 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1705                      struct nlmsghdr *nlh, struct nlattr *cda[])
1706 {
1707         struct nf_conntrack_tuple tuple;
1708         struct nf_conntrack_expect *exp;
1709         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1710         u_int8_t u3 = nfmsg->nfgen_family;
1711         int err = 0;
1712
1713         if (!cda[CTA_EXPECT_TUPLE]
1714             || !cda[CTA_EXPECT_MASK]
1715             || !cda[CTA_EXPECT_MASTER])
1716                 return -EINVAL;
1717
1718         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1719         if (err < 0)
1720                 return err;
1721
1722         spin_lock_bh(&nf_conntrack_lock);
1723         exp = __nf_ct_expect_find(&tuple);
1724
1725         if (!exp) {
1726                 spin_unlock_bh(&nf_conntrack_lock);
1727                 err = -ENOENT;
1728                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1729                         err = ctnetlink_create_expect(cda, u3);
1730                 return err;
1731         }
1732
1733         err = -EEXIST;
1734         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1735                 err = ctnetlink_change_expect(exp, cda);
1736         spin_unlock_bh(&nf_conntrack_lock);
1737
1738         return err;
1739 }
1740
1741 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1742 static struct notifier_block ctnl_notifier = {
1743         .notifier_call  = ctnetlink_conntrack_event,
1744 };
1745
1746 static struct notifier_block ctnl_notifier_exp = {
1747         .notifier_call  = ctnetlink_expect_event,
1748 };
1749 #endif
1750
1751 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1752         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1753                                             .attr_count = CTA_MAX,
1754                                             .policy = ct_nla_policy },
1755         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1756                                             .attr_count = CTA_MAX,
1757                                             .policy = ct_nla_policy },
1758         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1759                                             .attr_count = CTA_MAX,
1760                                             .policy = ct_nla_policy },
1761         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1762                                             .attr_count = CTA_MAX,
1763                                             .policy = ct_nla_policy },
1764 };
1765
1766 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1767         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1768                                             .attr_count = CTA_EXPECT_MAX,
1769                                             .policy = exp_nla_policy },
1770         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1771                                             .attr_count = CTA_EXPECT_MAX,
1772                                             .policy = exp_nla_policy },
1773         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1774                                             .attr_count = CTA_EXPECT_MAX,
1775                                             .policy = exp_nla_policy },
1776 };
1777
1778 static const struct nfnetlink_subsystem ctnl_subsys = {
1779         .name                           = "conntrack",
1780         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1781         .cb_count                       = IPCTNL_MSG_MAX,
1782         .cb                             = ctnl_cb,
1783 };
1784
1785 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1786         .name                           = "conntrack_expect",
1787         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1788         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1789         .cb                             = ctnl_exp_cb,
1790 };
1791
1792 MODULE_ALIAS("ip_conntrack_netlink");
1793 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1794 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1795
1796 static int __init ctnetlink_init(void)
1797 {
1798         int ret;
1799
1800         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1801         ret = nfnetlink_subsys_register(&ctnl_subsys);
1802         if (ret < 0) {
1803                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1804                 goto err_out;
1805         }
1806
1807         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1808         if (ret < 0) {
1809                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1810                 goto err_unreg_subsys;
1811         }
1812
1813 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1814         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1815         if (ret < 0) {
1816                 printk("ctnetlink_init: cannot register notifier.\n");
1817                 goto err_unreg_exp_subsys;
1818         }
1819
1820         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1821         if (ret < 0) {
1822                 printk("ctnetlink_init: cannot expect register notifier.\n");
1823                 goto err_unreg_notifier;
1824         }
1825 #endif
1826
1827         return 0;
1828
1829 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1830 err_unreg_notifier:
1831         nf_conntrack_unregister_notifier(&ctnl_notifier);
1832 err_unreg_exp_subsys:
1833         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1834 #endif
1835 err_unreg_subsys:
1836         nfnetlink_subsys_unregister(&ctnl_subsys);
1837 err_out:
1838         return ret;
1839 }
1840
1841 static void __exit ctnetlink_exit(void)
1842 {
1843         printk("ctnetlink: unregistering from nfnetlink.\n");
1844
1845 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1846         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1847         nf_conntrack_unregister_notifier(&ctnl_notifier);
1848 #endif
1849
1850         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1851         nfnetlink_subsys_unregister(&ctnl_subsys);
1852         return;
1853 }
1854
1855 module_init(ctnetlink_init);
1856 module_exit(ctnetlink_exit);