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/rculist.h>
  22 #include <linux/types.h>
  23 #include <linux/timer.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/errno.h>
  26 #include <linux/netlink.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/notifier.h>
  30
  31 #include <linux/netfilter.h>
  32 #include <net/netlink.h>
  33 #include <net/netfilter/nf_conntrack.h>
  34 #include <net/netfilter/nf_conntrack_core.h>
  35 #include <net/netfilter/nf_conntrack_expect.h>
  36 #include <net/netfilter/nf_conntrack_helper.h>
  37 #include <net/netfilter/nf_conntrack_l3proto.h>
  38 #include <net/netfilter/nf_conntrack_l4proto.h>
  39 #include <net/netfilter/nf_conntrack_tuple.h>
  40 #include <net/netfilter/nf_conntrack_acct.h>
  41 #ifdef CONFIG_NF_NAT_NEEDED
  42 #include <net/netfilter/nf_nat_core.h>
  43 #include <net/netfilter/nf_nat_protocol.h>
  44 #endif
  45
  46 #include <linux/netfilter/nfnetlink.h>
  47 #include <linux/netfilter/nfnetlink_conntrack.h>
  48
  49 MODULE_LICENSE("GPL");
  50
  51 static char __initdata version[] = "0.93";
  52
  53 static inline int
  54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  55                             const struct nf_conntrack_tuple *tuple,
  56                             struct nf_conntrack_l4proto *l4proto)
  57 {
  58         int ret = 0;
  59         struct nlattr *nest_parms;
  60
  61         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  62         if (!nest_parms)
  63                 goto nla_put_failure;
  64         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  65
  66         if (likely(l4proto->tuple_to_nlattr))
  67                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  68
  69         nla_nest_end(skb, nest_parms);
  70
  71         return ret;
  72
  73 nla_put_failure:
  74         return -1;
  75 }
  76
  77 static inline int
  78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  79                          const struct nf_conntrack_tuple *tuple,
  80                          struct nf_conntrack_l3proto *l3proto)
  81 {
  82         int ret = 0;
  83         struct nlattr *nest_parms;
  84
  85         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  86         if (!nest_parms)
  87                 goto nla_put_failure;
  88
  89         if (likely(l3proto->tuple_to_nlattr))
  90                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  91
  92         nla_nest_end(skb, nest_parms);
  93
  94         return ret;
  95
  96 nla_put_failure:
  97         return -1;
  98 }
  99
 100 static int
 101 ctnetlink_dump_tuples(struct sk_buff *skb,
 102                       const struct nf_conntrack_tuple *tuple)
 103 {
 104         int ret;
 105         struct nf_conntrack_l3proto *l3proto;
 106         struct nf_conntrack_l4proto *l4proto;
 107
 108         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 109         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 110
 111         if (unlikely(ret < 0))
 112                 return ret;
 113
 114         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 115         ret = ctnetlink_dump_tuples_proto(skb, tuple, 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(nf_ct_l3num(ct), nf_ct_protonum(ct));
 153         if (!l4proto->to_nlattr)
 154                 return 0;
 155
 156         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 157         if (!nest_proto)
 158                 goto nla_put_failure;
 159
 160         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 161
 162         nla_nest_end(skb, nest_proto);
 163
 164         return ret;
 165
 166 nla_put_failure:
 167         return -1;
 168 }
 169
 170 static inline int
 171 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 172 {
 173         struct nlattr *nest_helper;
 174         const struct nf_conn_help *help = nfct_help(ct);
 175         struct nf_conntrack_helper *helper;
 176
 177         if (!help)
 178                 return 0;
 179
 180         helper = rcu_dereference(help->helper);
 181         if (!helper)
 182                 goto out;
 183
 184         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 185         if (!nest_helper)
 186                 goto nla_put_failure;
 187         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 188
 189         if (helper->to_nlattr)
 190                 helper->to_nlattr(skb, ct);
 191
 192         nla_nest_end(skb, nest_helper);
 193 out:
 194         return 0;
 195
 196 nla_put_failure:
 197         return -1;
 198 }
 199
 200 static int
 201 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 202                         enum ip_conntrack_dir dir)
 203 {
 204         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 205         struct nlattr *nest_count;
 206         const struct nf_conn_counter *acct;
 207
 208         acct = nf_conn_acct_find(ct);
 209         if (!acct)
 210                 return 0;
 211
 212         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 213         if (!nest_count)
 214                 goto nla_put_failure;
 215
 216         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 217                      cpu_to_be64(acct[dir].packets));
 218         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 219                      cpu_to_be64(acct[dir].bytes));
 220
 221         nla_nest_end(skb, nest_count);
 222
 223         return 0;
 224
 225 nla_put_failure:
 226         return -1;
 227 }
 228
 229 #ifdef CONFIG_NF_CONNTRACK_MARK
 230 static inline int
 231 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 232 {
 233         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 234         return 0;
 235
 236 nla_put_failure:
 237         return -1;
 238 }
 239 #else
 240 #define ctnetlink_dump_mark(a, b) (0)
 241 #endif
 242
 243 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 244 static inline int
 245 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 246 {
 247         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 248         return 0;
 249
 250 nla_put_failure:
 251         return -1;
 252 }
 253 #else
 254 #define ctnetlink_dump_secmark(a, b) (0)
 255 #endif
 256
 257 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 258
 259 static inline int
 260 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 261 {
 262         struct nlattr *nest_parms;
 263
 264         if (!(ct->status & IPS_EXPECTED))
 265                 return 0;
 266
 267         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 268         if (!nest_parms)
 269                 goto nla_put_failure;
 270         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 271                 goto nla_put_failure;
 272         nla_nest_end(skb, nest_parms);
 273
 274         return 0;
 275
 276 nla_put_failure:
 277         return -1;
 278 }
 279
 280 #ifdef CONFIG_NF_NAT_NEEDED
 281 static int
 282 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 283 {
 284         struct nlattr *nest_parms;
 285
 286         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 287         if (!nest_parms)
 288                 goto nla_put_failure;
 289
 290         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 291                      htonl(natseq->correction_pos));
 292         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 293                      htonl(natseq->offset_before));
 294         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 295                      htonl(natseq->offset_after));
 296
 297         nla_nest_end(skb, nest_parms);
 298
 299         return 0;
 300
 301 nla_put_failure:
 302         return -1;
 303 }
 304
 305 static inline int
 306 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 307 {
 308         struct nf_nat_seq *natseq;
 309         struct nf_conn_nat *nat = nfct_nat(ct);
 310
 311         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 312                 return 0;
 313
 314         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 315         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 316                 return -1;
 317
 318         natseq = &nat->seq[IP_CT_DIR_REPLY];
 319         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 320                 return -1;
 321
 322         return 0;
 323 }
 324 #else
 325 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 326 #endif
 327
 328 static inline int
 329 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 330 {
 331         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 332         return 0;
 333
 334 nla_put_failure:
 335         return -1;
 336 }
 337
 338 static inline int
 339 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 340 {
 341         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 342         return 0;
 343
 344 nla_put_failure:
 345         return -1;
 346 }
 347
 348 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 349
 350 static int
 351 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 352                     int event, int nowait,
 353                     const struct nf_conn *ct)
 354 {
 355         struct nlmsghdr *nlh;
 356         struct nfgenmsg *nfmsg;
 357         struct nlattr *nest_parms;
 358         unsigned char *b = skb_tail_pointer(skb);
 359
 360         event |= NFNL_SUBSYS_CTNETLINK << 8;
 361         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 362         nfmsg  = NLMSG_DATA(nlh);
 363
 364         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 365         nfmsg->nfgen_family = nf_ct_l3num(ct);
 366         nfmsg->version      = NFNETLINK_V0;
 367         nfmsg->res_id       = 0;
 368
 369         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 370         if (!nest_parms)
 371                 goto nla_put_failure;
 372         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 373                 goto nla_put_failure;
 374         nla_nest_end(skb, nest_parms);
 375
 376         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 377         if (!nest_parms)
 378                 goto nla_put_failure;
 379         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 380                 goto nla_put_failure;
 381         nla_nest_end(skb, nest_parms);
 382
 383         if (ctnetlink_dump_status(skb, ct) < 0 ||
 384             ctnetlink_dump_timeout(skb, ct) < 0 ||
 385             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 386             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 387             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 388             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 389             ctnetlink_dump_mark(skb, ct) < 0 ||
 390             ctnetlink_dump_secmark(skb, ct) < 0 ||
 391             ctnetlink_dump_id(skb, ct) < 0 ||
 392             ctnetlink_dump_use(skb, ct) < 0 ||
 393             ctnetlink_dump_master(skb, ct) < 0 ||
 394             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 395                 goto nla_put_failure;
 396
 397         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 398         return skb->len;
 399
 400 nlmsg_failure:
 401 nla_put_failure:
 402         nlmsg_trim(skb, b);
 403         return -1;
 404 }
 405
 406 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 407 static int ctnetlink_conntrack_event(struct notifier_block *this,
 408                                      unsigned long events, void *ptr)
 409 {
 410         struct nlmsghdr *nlh;
 411         struct nfgenmsg *nfmsg;
 412         struct nlattr *nest_parms;
 413         struct nf_ct_event *item = (struct nf_ct_event *)ptr;
 414         struct nf_conn *ct = item->ct;
 415         struct sk_buff *skb;
 416         unsigned int type;
 417         sk_buff_data_t b;
 418         unsigned int flags = 0, group;
 419
 420         /* ignore our fake conntrack entry */
 421         if (ct == &nf_conntrack_untracked)
 422                 return NOTIFY_DONE;
 423
 424         if (events & IPCT_DESTROY) {
 425                 type = IPCTNL_MSG_CT_DELETE;
 426                 group = NFNLGRP_CONNTRACK_DESTROY;
 427         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 428                 type = IPCTNL_MSG_CT_NEW;
 429                 flags = NLM_F_CREATE|NLM_F_EXCL;
 430                 group = NFNLGRP_CONNTRACK_NEW;
 431         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 432                 type = IPCTNL_MSG_CT_NEW;
 433                 group = NFNLGRP_CONNTRACK_UPDATE;
 434         } else
 435                 return NOTIFY_DONE;
 436
 437         if (!nfnetlink_has_listeners(group))
 438                 return NOTIFY_DONE;
 439
 440         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 441         if (!skb)
 442                 return NOTIFY_DONE;
 443
 444         b = skb->tail;
 445
 446         type |= NFNL_SUBSYS_CTNETLINK << 8;
 447         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
 448         nfmsg = NLMSG_DATA(nlh);
 449
 450         nlh->nlmsg_flags    = flags;
 451         nfmsg->nfgen_family = nf_ct_l3num(ct);
 452         nfmsg->version  = NFNETLINK_V0;
 453         nfmsg->res_id   = 0;
 454
 455         rcu_read_lock();
 456         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 457         if (!nest_parms)
 458                 goto nla_put_failure;
 459         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 460                 goto nla_put_failure;
 461         nla_nest_end(skb, nest_parms);
 462
 463         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 464         if (!nest_parms)
 465                 goto nla_put_failure;
 466         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 467                 goto nla_put_failure;
 468         nla_nest_end(skb, nest_parms);
 469
 470         if (ctnetlink_dump_id(skb, ct) < 0)
 471                 goto nla_put_failure;
 472
 473         if (ctnetlink_dump_status(skb, ct) < 0)
 474                 goto nla_put_failure;
 475
 476         if (events & IPCT_DESTROY) {
 477                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 478                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 479                         goto nla_put_failure;
 480         } else {
 481                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 482                         goto nla_put_failure;
 483
 484                 if (events & IPCT_PROTOINFO
 485                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 486                         goto nla_put_failure;
 487
 488                 if ((events & IPCT_HELPER || nfct_help(ct))
 489                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 490                         goto nla_put_failure;
 491
 492 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 493                 if ((events & IPCT_SECMARK || ct->secmark)
 494                     && ctnetlink_dump_secmark(skb, ct) < 0)
 495                         goto nla_put_failure;
 496 #endif
 497
 498                 if (events & IPCT_RELATED &&
 499                     ctnetlink_dump_master(skb, ct) < 0)
 500                         goto nla_put_failure;
 501
 502                 if (events & IPCT_NATSEQADJ &&
 503                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 504                         goto nla_put_failure;
 505         }
 506
 507 #ifdef CONFIG_NF_CONNTRACK_MARK
 508         if ((events & IPCT_MARK || ct->mark)
 509             && ctnetlink_dump_mark(skb, ct) < 0)
 510                 goto nla_put_failure;
 511 #endif
 512         rcu_read_unlock();
 513
 514         nlh->nlmsg_len = skb->tail - b;
 515         nfnetlink_send(skb, item->pid, group, item->report);
 516         return NOTIFY_DONE;
 517
 518 nla_put_failure:
 519         rcu_read_unlock();
 520 nlmsg_failure:
 521         kfree_skb(skb);
 522         return NOTIFY_DONE;
 523 }
 524 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 525
 526 static int ctnetlink_done(struct netlink_callback *cb)
 527 {
 528         if (cb->args[1])
 529                 nf_ct_put((struct nf_conn *)cb->args[1]);
 530         return 0;
 531 }
 532
 533 static int
 534 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 535 {
 536         struct nf_conn *ct, *last;
 537         struct nf_conntrack_tuple_hash *h;
 538         struct hlist_node *n;
 539         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 540         u_int8_t l3proto = nfmsg->nfgen_family;
 541
 542         rcu_read_lock();
 543         last = (struct nf_conn *)cb->args[1];
 544         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 545 restart:
 546                 hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 547                                          hnode) {
 548                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 549                                 continue;
 550                         ct = nf_ct_tuplehash_to_ctrack(h);
 551                         /* Dump entries of a given L3 protocol number.
 552                          * If it is not specified, ie. l3proto == 0,
 553                          * then dump everything. */
 554                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 555                                 continue;
 556                         if (cb->args[1]) {
 557                                 if (ct != last)
 558                                         continue;
 559                                 cb->args[1] = 0;
 560                         }
 561                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 562                                                 cb->nlh->nlmsg_seq,
 563                                                 IPCTNL_MSG_CT_NEW,
 564                                                 1, ct) < 0) {
 565                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
 566                                         continue;
 567                                 cb->args[1] = (unsigned long)ct;
 568                                 goto out;
 569                         }
 570
 571                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 572                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 573                                 struct nf_conn_counter *acct;
 574
 575                                 acct = nf_conn_acct_find(ct);
 576                                 if (acct)
 577                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 578                         }
 579                 }
 580                 if (cb->args[1]) {
 581                         cb->args[1] = 0;
 582                         goto restart;
 583                 }
 584         }
 585 out:
 586         rcu_read_unlock();
 587         if (last)
 588                 nf_ct_put(last);
 589
 590         return skb->len;
 591 }
 592
 593 static inline int
 594 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 595 {
 596         struct nlattr *tb[CTA_IP_MAX+1];
 597         struct nf_conntrack_l3proto *l3proto;
 598         int ret = 0;
 599
 600         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 601
 602         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 603
 604         if (likely(l3proto->nlattr_to_tuple)) {
 605                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 606                                           l3proto->nla_policy);
 607                 if (ret == 0)
 608                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 609         }
 610
 611         nf_ct_l3proto_put(l3proto);
 612
 613         return ret;
 614 }
 615
 616 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 617         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 618 };
 619
 620 static inline int
 621 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 622                             struct nf_conntrack_tuple *tuple)
 623 {
 624         struct nlattr *tb[CTA_PROTO_MAX+1];
 625         struct nf_conntrack_l4proto *l4proto;
 626         int ret = 0;
 627
 628         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 629         if (ret < 0)
 630                 return ret;
 631
 632         if (!tb[CTA_PROTO_NUM])
 633                 return -EINVAL;
 634         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 635
 636         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 637
 638         if (likely(l4proto->nlattr_to_tuple)) {
 639                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 640                                           l4proto->nla_policy);
 641                 if (ret == 0)
 642                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 643         }
 644
 645         nf_ct_l4proto_put(l4proto);
 646
 647         return ret;
 648 }
 649
 650 static int
 651 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 652                       enum ctattr_tuple type, u_int8_t l3num)
 653 {
 654         struct nlattr *tb[CTA_TUPLE_MAX+1];
 655         int err;
 656
 657         memset(tuple, 0, sizeof(*tuple));
 658
 659         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 660
 661         if (!tb[CTA_TUPLE_IP])
 662                 return -EINVAL;
 663
 664         tuple->src.l3num = l3num;
 665
 666         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 667         if (err < 0)
 668                 return err;
 669
 670         if (!tb[CTA_TUPLE_PROTO])
 671                 return -EINVAL;
 672
 673         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 674         if (err < 0)
 675                 return err;
 676
 677         /* orig and expect tuples get DIR_ORIGINAL */
 678         if (type == CTA_TUPLE_REPLY)
 679                 tuple->dst.dir = IP_CT_DIR_REPLY;
 680         else
 681                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 682
 683         return 0;
 684 }
 685
 686 static inline int
 687 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 688 {
 689         struct nlattr *tb[CTA_HELP_MAX+1];
 690
 691         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 692
 693         if (!tb[CTA_HELP_NAME])
 694                 return -EINVAL;
 695
 696         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 697
 698         return 0;
 699 }
 700
 701 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 702         [CTA_STATUS]            = { .type = NLA_U32 },
 703         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 704         [CTA_MARK]              = { .type = NLA_U32 },
 705         [CTA_USE]               = { .type = NLA_U32 },
 706         [CTA_ID]                = { .type = NLA_U32 },
 707 };
 708
 709 static int
 710 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 711                         struct nlmsghdr *nlh, struct nlattr *cda[])
 712 {
 713         struct nf_conntrack_tuple_hash *h;
 714         struct nf_conntrack_tuple tuple;
 715         struct nf_conn *ct;
 716         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 717         u_int8_t u3 = nfmsg->nfgen_family;
 718         int err = 0;
 719
 720         if (cda[CTA_TUPLE_ORIG])
 721                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 722         else if (cda[CTA_TUPLE_REPLY])
 723                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 724         else {
 725                 /* Flush the whole table */
 726                 nf_conntrack_flush(&init_net,
 727                                    NETLINK_CB(skb).pid,
 728                                    nlmsg_report(nlh));
 729                 return 0;
 730         }
 731
 732         if (err < 0)
 733                 return err;
 734
 735         h = nf_conntrack_find_get(&init_net, &tuple);
 736         if (!h)
 737                 return -ENOENT;
 738
 739         ct = nf_ct_tuplehash_to_ctrack(h);
 740
 741         if (cda[CTA_ID]) {
 742                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 743                 if (id != (u32)(unsigned long)ct) {
 744                         nf_ct_put(ct);
 745                         return -ENOENT;
 746                 }
 747         }
 748
 749         nf_conntrack_event_report(IPCT_DESTROY,
 750                                   ct,
 751                                   NETLINK_CB(skb).pid,
 752                                   nlmsg_report(nlh));
 753
 754         /* death_by_timeout would report the event again */
 755         set_bit(IPS_DYING_BIT, &ct->status);
 756
 757         nf_ct_kill(ct);
 758         nf_ct_put(ct);
 759
 760         return 0;
 761 }
 762
 763 static int
 764 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 765                         struct nlmsghdr *nlh, struct nlattr *cda[])
 766 {
 767         struct nf_conntrack_tuple_hash *h;
 768         struct nf_conntrack_tuple tuple;
 769         struct nf_conn *ct;
 770         struct sk_buff *skb2 = NULL;
 771         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 772         u_int8_t u3 = nfmsg->nfgen_family;
 773         int err = 0;
 774
 775         if (nlh->nlmsg_flags & NLM_F_DUMP)
 776                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 777                                           ctnetlink_done);
 778
 779         if (cda[CTA_TUPLE_ORIG])
 780                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 781         else if (cda[CTA_TUPLE_REPLY])
 782                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 783         else
 784                 return -EINVAL;
 785
 786         if (err < 0)
 787                 return err;
 788
 789         h = nf_conntrack_find_get(&init_net, &tuple);
 790         if (!h)
 791                 return -ENOENT;
 792
 793         ct = nf_ct_tuplehash_to_ctrack(h);
 794
 795         err = -ENOMEM;
 796         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 797         if (!skb2) {
 798                 nf_ct_put(ct);
 799                 return -ENOMEM;
 800         }
 801
 802         rcu_read_lock();
 803         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 804                                   IPCTNL_MSG_CT_NEW, 1, ct);
 805         rcu_read_unlock();
 806         nf_ct_put(ct);
 807         if (err <= 0)
 808                 goto free;
 809
 810         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 811         if (err < 0)
 812                 goto out;
 813
 814         return 0;
 815
 816 free:
 817         kfree_skb(skb2);
 818 out:
 819         return err;
 820 }
 821
 822 #ifdef CONFIG_NF_NAT_NEEDED
 823 static int
 824 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 825                           enum nf_nat_manip_type manip,
 826                           struct nlattr *attr)
 827 {
 828         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 829
 830         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 831         if (!parse_nat_setup) {
 832 #ifdef CONFIG_MODULES
 833                 rcu_read_unlock();
 834                 nfnl_unlock();
 835                 if (request_module("nf-nat-ipv4") < 0) {
 836                         nfnl_lock();
 837                         rcu_read_lock();
 838                         return -EOPNOTSUPP;
 839                 }
 840                 nfnl_lock();
 841                 rcu_read_lock();
 842                 if (nfnetlink_parse_nat_setup_hook)
 843                         return -EAGAIN;
 844 #endif
 845                 return -EOPNOTSUPP;
 846         }
 847
 848         return parse_nat_setup(ct, manip, attr);
 849 }
 850 #endif
 851
 852 static int
 853 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 854 {
 855         unsigned long d;
 856         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 857         d = ct->status ^ status;
 858
 859         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 860                 /* unchangeable */
 861                 return -EBUSY;
 862
 863         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 864                 /* SEEN_REPLY bit can only be set */
 865                 return -EBUSY;
 866
 867         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 868                 /* ASSURED bit can only be set */
 869                 return -EBUSY;
 870
 871         /* Be careful here, modifying NAT bits can screw up things,
 872          * so don't let users modify them directly if they don't pass
 873          * nf_nat_range. */
 874         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 875         return 0;
 876 }
 877
 878 static int
 879 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 880 {
 881 #ifdef CONFIG_NF_NAT_NEEDED
 882         int ret;
 883
 884         if (cda[CTA_NAT_DST]) {
 885                 ret = ctnetlink_parse_nat_setup(ct,
 886                                                 IP_NAT_MANIP_DST,
 887                                                 cda[CTA_NAT_DST]);
 888                 if (ret < 0)
 889                         return ret;
 890         }
 891         if (cda[CTA_NAT_SRC]) {
 892                 ret = ctnetlink_parse_nat_setup(ct,
 893                                                 IP_NAT_MANIP_SRC,
 894                                                 cda[CTA_NAT_SRC]);
 895                 if (ret < 0)
 896                         return ret;
 897         }
 898         return 0;
 899 #else
 900         return -EOPNOTSUPP;
 901 #endif
 902 }
 903
 904 static inline int
 905 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 906 {
 907         struct nf_conntrack_helper *helper;
 908         struct nf_conn_help *help = nfct_help(ct);
 909         char *helpname;
 910         int err;
 911
 912         /* don't change helper of sibling connections */
 913         if (ct->master)
 914                 return -EBUSY;
 915
 916         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 917         if (err < 0)
 918                 return err;
 919
 920         if (!strcmp(helpname, "")) {
 921                 if (help && help->helper) {
 922                         /* we had a helper before ... */
 923                         nf_ct_remove_expectations(ct);
 924                         rcu_assign_pointer(help->helper, NULL);
 925                 }
 926
 927                 return 0;
 928         }
 929
 930         helper = __nf_conntrack_helper_find_byname(helpname);
 931         if (helper == NULL) {
 932 #ifdef CONFIG_MODULES
 933                 spin_unlock_bh(&nf_conntrack_lock);
 934
 935                 if (request_module("nfct-helper-%s", helpname) < 0) {
 936                         spin_lock_bh(&nf_conntrack_lock);
 937                         return -EOPNOTSUPP;
 938                 }
 939
 940                 spin_lock_bh(&nf_conntrack_lock);
 941                 helper = __nf_conntrack_helper_find_byname(helpname);
 942                 if (helper)
 943                         return -EAGAIN;
 944 #endif
 945                 return -EOPNOTSUPP;
 946         }
 947
 948         if (help) {
 949                 if (help->helper == helper)
 950                         return 0;
 951                 if (help->helper)
 952                         return -EBUSY;
 953                 /* need to zero data of old helper */
 954                 memset(&help->help, 0, sizeof(help->help));
 955         } else {
 956                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
 957                 if (help == NULL)
 958                         return -ENOMEM;
 959         }
 960
 961         rcu_assign_pointer(help->helper, helper);
 962
 963         return 0;
 964 }
 965
 966 static inline int
 967 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 968 {
 969         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 970
 971         if (!del_timer(&ct->timeout))
 972                 return -ETIME;
 973
 974         ct->timeout.expires = jiffies + timeout * HZ;
 975         add_timer(&ct->timeout);
 976
 977         return 0;
 978 }
 979
 980 static inline int
 981 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 982 {
 983         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
 984         struct nf_conntrack_l4proto *l4proto;
 985         int err = 0;
 986
 987         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 988
 989         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
 990         if (l4proto->from_nlattr)
 991                 err = l4proto->from_nlattr(tb, ct);
 992         nf_ct_l4proto_put(l4proto);
 993
 994         return err;
 995 }
 996
 997 #ifdef CONFIG_NF_NAT_NEEDED
 998 static inline int
 999 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1000 {
1001         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1002
1003         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1004
1005         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1006                 return -EINVAL;
1007
1008         natseq->correction_pos =
1009                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1010
1011         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1012                 return -EINVAL;
1013
1014         natseq->offset_before =
1015                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1016
1017         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1018                 return -EINVAL;
1019
1020         natseq->offset_after =
1021                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1022
1023         return 0;
1024 }
1025
1026 static int
1027 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1028 {
1029         int ret = 0;
1030         struct nf_conn_nat *nat = nfct_nat(ct);
1031
1032         if (!nat)
1033                 return 0;
1034
1035         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1036                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1037                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1038                 if (ret < 0)
1039                         return ret;
1040
1041                 ct->status |= IPS_SEQ_ADJUST;
1042         }
1043
1044         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1045                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1046                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1047                 if (ret < 0)
1048                         return ret;
1049
1050                 ct->status |= IPS_SEQ_ADJUST;
1051         }
1052
1053         return 0;
1054 }
1055 #endif
1056
1057 static int
1058 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1059 {
1060         int err;
1061
1062         if (cda[CTA_HELP]) {
1063                 err = ctnetlink_change_helper(ct, cda);
1064                 if (err < 0)
1065                         return err;
1066         }
1067
1068         if (cda[CTA_TIMEOUT]) {
1069                 err = ctnetlink_change_timeout(ct, cda);
1070                 if (err < 0)
1071                         return err;
1072         }
1073
1074         if (cda[CTA_STATUS]) {
1075                 err = ctnetlink_change_status(ct, cda);
1076                 if (err < 0)
1077                         return err;
1078         }
1079
1080         if (cda[CTA_PROTOINFO]) {
1081                 err = ctnetlink_change_protoinfo(ct, cda);
1082                 if (err < 0)
1083                         return err;
1084         }
1085
1086 #if defined(CONFIG_NF_CONNTRACK_MARK)
1087         if (cda[CTA_MARK])
1088                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1089 #endif
1090
1091 #ifdef CONFIG_NF_NAT_NEEDED
1092         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1093                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1094                 if (err < 0)
1095                         return err;
1096         }
1097 #endif
1098
1099         return 0;
1100 }
1101
1102 static inline void
1103 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1104 {
1105         unsigned int events = 0;
1106
1107         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1108                 events |= IPCT_RELATED;
1109         else
1110                 events |= IPCT_NEW;
1111
1112         nf_conntrack_event_report(IPCT_STATUS |
1113                                   IPCT_HELPER |
1114                                   IPCT_REFRESH |
1115                                   IPCT_PROTOINFO |
1116                                   IPCT_NATSEQADJ |
1117                                   IPCT_MARK |
1118                                   events,
1119                                   ct,
1120                                   pid,
1121                                   report);
1122 }
1123
1124 static int
1125 ctnetlink_create_conntrack(struct nlattr *cda[],
1126                            struct nf_conntrack_tuple *otuple,
1127                            struct nf_conntrack_tuple *rtuple,
1128                            struct nf_conn *master_ct,
1129                            u32 pid,
1130                            int report)
1131 {
1132         struct nf_conn *ct;
1133         int err = -EINVAL;
1134         struct nf_conntrack_helper *helper;
1135
1136         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1137         if (ct == NULL || IS_ERR(ct))
1138                 return -ENOMEM;
1139
1140         if (!cda[CTA_TIMEOUT])
1141                 goto err;
1142         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1143
1144         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1145         ct->status |= IPS_CONFIRMED;
1146
1147         rcu_read_lock();
1148         if (cda[CTA_HELP]) {
1149                 char *helpname;
1150
1151                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1152                 if (err < 0) {
1153                         rcu_read_unlock();
1154                         goto err;
1155                 }
1156
1157                 helper = __nf_conntrack_helper_find_byname(helpname);
1158                 if (helper == NULL) {
1159                         rcu_read_unlock();
1160 #ifdef CONFIG_MODULES
1161                         if (request_module("nfct-helper-%s", helpname) < 0) {
1162                                 err = -EOPNOTSUPP;
1163                                 goto err;
1164                         }
1165
1166                         rcu_read_lock();
1167                         helper = __nf_conntrack_helper_find_byname(helpname);
1168                         if (helper) {
1169                                 rcu_read_unlock();
1170                                 err = -EAGAIN;
1171                                 goto err;
1172                         }
1173                         rcu_read_unlock();
1174 #endif
1175                         err = -EOPNOTSUPP;
1176                         goto err;
1177                 } else {
1178                         struct nf_conn_help *help;
1179
1180                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1181                         if (help == NULL) {
1182                                 rcu_read_unlock();
1183                                 err = -ENOMEM;
1184                                 goto err;
1185                         }
1186
1187                         /* not in hash table yet so not strictly necessary */
1188                         rcu_assign_pointer(help->helper, helper);
1189                 }
1190         } else {
1191                 /* try an implicit helper assignation */
1192                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1193                 if (err < 0) {
1194                         rcu_read_unlock();
1195                         goto err;
1196                 }
1197         }
1198
1199         if (cda[CTA_STATUS]) {
1200                 err = ctnetlink_change_status(ct, cda);
1201                 if (err < 0) {
1202                         rcu_read_unlock();
1203                         goto err;
1204                 }
1205         }
1206
1207         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1208                 err = ctnetlink_change_nat(ct, cda);
1209                 if (err < 0) {
1210                         rcu_read_unlock();
1211                         goto err;
1212                 }
1213         }
1214
1215         if (cda[CTA_PROTOINFO]) {
1216                 err = ctnetlink_change_protoinfo(ct, cda);
1217                 if (err < 0) {
1218                         rcu_read_unlock();
1219                         goto err;
1220                 }
1221         }
1222
1223         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1224
1225 #if defined(CONFIG_NF_CONNTRACK_MARK)
1226         if (cda[CTA_MARK])
1227                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1228 #endif
1229
1230         /* setup master conntrack: this is a confirmed expectation */
1231         if (master_ct) {
1232                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1233                 ct->master = master_ct;
1234         }
1235
1236         nf_conntrack_get(&ct->ct_general);
1237         add_timer(&ct->timeout);
1238         nf_conntrack_hash_insert(ct);
1239         rcu_read_unlock();
1240         ctnetlink_event_report(ct, pid, report);
1241         nf_ct_put(ct);
1242
1243         return 0;
1244
1245 err:
1246         nf_conntrack_free(ct);
1247         return err;
1248 }
1249
1250 static int
1251 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1252                         struct nlmsghdr *nlh, struct nlattr *cda[])
1253 {
1254         struct nf_conntrack_tuple otuple, rtuple;
1255         struct nf_conntrack_tuple_hash *h = NULL;
1256         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1257         u_int8_t u3 = nfmsg->nfgen_family;
1258         int err = 0;
1259
1260         if (cda[CTA_TUPLE_ORIG]) {
1261                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1262                 if (err < 0)
1263                         return err;
1264         }
1265
1266         if (cda[CTA_TUPLE_REPLY]) {
1267                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1268                 if (err < 0)
1269                         return err;
1270         }
1271
1272         spin_lock_bh(&nf_conntrack_lock);
1273         if (cda[CTA_TUPLE_ORIG])
1274                 h = __nf_conntrack_find(&init_net, &otuple);
1275         else if (cda[CTA_TUPLE_REPLY])
1276                 h = __nf_conntrack_find(&init_net, &rtuple);
1277
1278         if (h == NULL) {
1279                 struct nf_conntrack_tuple master;
1280                 struct nf_conntrack_tuple_hash *master_h = NULL;
1281                 struct nf_conn *master_ct = NULL;
1282
1283                 if (cda[CTA_TUPLE_MASTER]) {
1284                         err = ctnetlink_parse_tuple(cda,
1285                                                     &master,
1286                                                     CTA_TUPLE_MASTER,
1287                                                     u3);
1288                         if (err < 0)
1289                                 goto out_unlock;
1290
1291                         master_h = __nf_conntrack_find(&init_net, &master);
1292                         if (master_h == NULL) {
1293                                 err = -ENOENT;
1294                                 goto out_unlock;
1295                         }
1296                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1297                         nf_conntrack_get(&master_ct->ct_general);
1298                 }
1299
1300                 err = -ENOENT;
1301                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1302                         err = ctnetlink_create_conntrack(cda,
1303                                                          &otuple,
1304                                                          &rtuple,
1305                                                          master_ct,
1306                                                          NETLINK_CB(skb).pid,
1307                                                          nlmsg_report(nlh));
1308                 spin_unlock_bh(&nf_conntrack_lock);
1309                 if (err < 0 && master_ct)
1310                         nf_ct_put(master_ct);
1311
1312                 return err;
1313         }
1314         /* implicit 'else' */
1315
1316         /* We manipulate the conntrack inside the global conntrack table lock,
1317          * so there's no need to increase the refcount */
1318         err = -EEXIST;
1319         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1320                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1321
1322                 /* we only allow nat config for new conntracks */
1323                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1324                         err = -EOPNOTSUPP;
1325                         goto out_unlock;
1326                 }
1327                 /* can't link an existing conntrack to a master */
1328                 if (cda[CTA_TUPLE_MASTER]) {
1329                         err = -EOPNOTSUPP;
1330                         goto out_unlock;
1331                 }
1332
1333                 err = ctnetlink_change_conntrack(ct, cda);
1334                 if (err == 0) {
1335                         nf_conntrack_get(&ct->ct_general);
1336                         spin_unlock_bh(&nf_conntrack_lock);
1337                         ctnetlink_event_report(ct,
1338                                                NETLINK_CB(skb).pid,
1339                                                nlmsg_report(nlh));
1340                         nf_ct_put(ct);
1341                 } else
1342                         spin_unlock_bh(&nf_conntrack_lock);
1343
1344                 return err;
1345         }
1346
1347 out_unlock:
1348         spin_unlock_bh(&nf_conntrack_lock);
1349         return err;
1350 }
1351
1352 /***********************************************************************
1353  * EXPECT
1354  ***********************************************************************/
1355
1356 static inline int
1357 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1358                          const struct nf_conntrack_tuple *tuple,
1359                          enum ctattr_expect type)
1360 {
1361         struct nlattr *nest_parms;
1362
1363         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1364         if (!nest_parms)
1365                 goto nla_put_failure;
1366         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1367                 goto nla_put_failure;
1368         nla_nest_end(skb, nest_parms);
1369
1370         return 0;
1371
1372 nla_put_failure:
1373         return -1;
1374 }
1375
1376 static inline int
1377 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1378                         const struct nf_conntrack_tuple *tuple,
1379                         const struct nf_conntrack_tuple_mask *mask)
1380 {
1381         int ret;
1382         struct nf_conntrack_l3proto *l3proto;
1383         struct nf_conntrack_l4proto *l4proto;
1384         struct nf_conntrack_tuple m;
1385         struct nlattr *nest_parms;
1386
1387         memset(&m, 0xFF, sizeof(m));
1388         m.src.u.all = mask->src.u.all;
1389         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1390
1391         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1392         if (!nest_parms)
1393                 goto nla_put_failure;
1394
1395         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1396         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1397
1398         if (unlikely(ret < 0))
1399                 goto nla_put_failure;
1400
1401         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1402         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1403         if (unlikely(ret < 0))
1404                 goto nla_put_failure;
1405
1406         nla_nest_end(skb, nest_parms);
1407
1408         return 0;
1409
1410 nla_put_failure:
1411         return -1;
1412 }
1413
1414 static int
1415 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1416                           const struct nf_conntrack_expect *exp)
1417 {
1418         struct nf_conn *master = exp->master;
1419         long timeout = (exp->timeout.expires - jiffies) / HZ;
1420
1421         if (timeout < 0)
1422                 timeout = 0;
1423
1424         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1425                 goto nla_put_failure;
1426         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1427                 goto nla_put_failure;
1428         if (ctnetlink_exp_dump_tuple(skb,
1429                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1430                                  CTA_EXPECT_MASTER) < 0)
1431                 goto nla_put_failure;
1432
1433         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1434         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1435
1436         return 0;
1437
1438 nla_put_failure:
1439         return -1;
1440 }
1441
1442 static int
1443 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1444                     int event,
1445                     int nowait,
1446                     const struct nf_conntrack_expect *exp)
1447 {
1448         struct nlmsghdr *nlh;
1449         struct nfgenmsg *nfmsg;
1450         unsigned char *b = skb_tail_pointer(skb);
1451
1452         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1453         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1454         nfmsg  = NLMSG_DATA(nlh);
1455
1456         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1457         nfmsg->nfgen_family = exp->tuple.src.l3num;
1458         nfmsg->version      = NFNETLINK_V0;
1459         nfmsg->res_id       = 0;
1460
1461         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1462                 goto nla_put_failure;
1463
1464         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1465         return skb->len;
1466
1467 nlmsg_failure:
1468 nla_put_failure:
1469         nlmsg_trim(skb, b);
1470         return -1;
1471 }
1472
1473 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1474 static int ctnetlink_expect_event(struct notifier_block *this,
1475                                   unsigned long events, void *ptr)
1476 {
1477         struct nlmsghdr *nlh;
1478         struct nfgenmsg *nfmsg;
1479         struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1480         struct nf_conntrack_expect *exp = item->exp;
1481         struct sk_buff *skb;
1482         unsigned int type;
1483         sk_buff_data_t b;
1484         int flags = 0;
1485
1486         if (events & IPEXP_NEW) {
1487                 type = IPCTNL_MSG_EXP_NEW;
1488                 flags = NLM_F_CREATE|NLM_F_EXCL;
1489         } else
1490                 return NOTIFY_DONE;
1491
1492         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1493                 return NOTIFY_DONE;
1494
1495         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1496         if (!skb)
1497                 return NOTIFY_DONE;
1498
1499         b = skb->tail;
1500
1501         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1502         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1503         nfmsg = NLMSG_DATA(nlh);
1504
1505         nlh->nlmsg_flags    = flags;
1506         nfmsg->nfgen_family = exp->tuple.src.l3num;
1507         nfmsg->version      = NFNETLINK_V0;
1508         nfmsg->res_id       = 0;
1509
1510         rcu_read_lock();
1511         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1512                 goto nla_put_failure;
1513         rcu_read_unlock();
1514
1515         nlh->nlmsg_len = skb->tail - b;
1516         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1517         return NOTIFY_DONE;
1518
1519 nla_put_failure:
1520         rcu_read_unlock();
1521 nlmsg_failure:
1522         kfree_skb(skb);
1523         return NOTIFY_DONE;
1524 }
1525 #endif
1526 static int ctnetlink_exp_done(struct netlink_callback *cb)
1527 {
1528         if (cb->args[1])
1529                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1530         return 0;
1531 }
1532
1533 static int
1534 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1535 {
1536         struct net *net = &init_net;
1537         struct nf_conntrack_expect *exp, *last;
1538         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1539         struct hlist_node *n;
1540         u_int8_t l3proto = nfmsg->nfgen_family;
1541
1542         rcu_read_lock();
1543         last = (struct nf_conntrack_expect *)cb->args[1];
1544         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1545 restart:
1546                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1547                                      hnode) {
1548                         if (l3proto && exp->tuple.src.l3num != l3proto)
1549                                 continue;
1550                         if (cb->args[1]) {
1551                                 if (exp != last)
1552                                         continue;
1553                                 cb->args[1] = 0;
1554                         }
1555                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1556                                                     cb->nlh->nlmsg_seq,
1557                                                     IPCTNL_MSG_EXP_NEW,
1558                                                     1, exp) < 0) {
1559                                 if (!atomic_inc_not_zero(&exp->use))
1560                                         continue;
1561                                 cb->args[1] = (unsigned long)exp;
1562                                 goto out;
1563                         }
1564                 }
1565                 if (cb->args[1]) {
1566                         cb->args[1] = 0;
1567                         goto restart;
1568                 }
1569         }
1570 out:
1571         rcu_read_unlock();
1572         if (last)
1573                 nf_ct_expect_put(last);
1574
1575         return skb->len;
1576 }
1577
1578 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1579         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1580         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1581 };
1582
1583 static int
1584 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1585                      struct nlmsghdr *nlh, struct nlattr *cda[])
1586 {
1587         struct nf_conntrack_tuple tuple;
1588         struct nf_conntrack_expect *exp;
1589         struct sk_buff *skb2;
1590         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1591         u_int8_t u3 = nfmsg->nfgen_family;
1592         int err = 0;
1593
1594         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1595                 return netlink_dump_start(ctnl, skb, nlh,
1596                                           ctnetlink_exp_dump_table,
1597                                           ctnetlink_exp_done);
1598         }
1599
1600         if (cda[CTA_EXPECT_MASTER])
1601                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1602         else
1603                 return -EINVAL;
1604
1605         if (err < 0)
1606                 return err;
1607
1608         exp = nf_ct_expect_find_get(&init_net, &tuple);
1609         if (!exp)
1610                 return -ENOENT;
1611
1612         if (cda[CTA_EXPECT_ID]) {
1613                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1614                 if (ntohl(id) != (u32)(unsigned long)exp) {
1615                         nf_ct_expect_put(exp);
1616                         return -ENOENT;
1617                 }
1618         }
1619
1620         err = -ENOMEM;
1621         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1622         if (!skb2)
1623                 goto out;
1624
1625         rcu_read_lock();
1626         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1627                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1628                                       1, exp);
1629         rcu_read_unlock();
1630         if (err <= 0)
1631                 goto free;
1632
1633         nf_ct_expect_put(exp);
1634
1635         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1636
1637 free:
1638         kfree_skb(skb2);
1639 out:
1640         nf_ct_expect_put(exp);
1641         return err;
1642 }
1643
1644 static int
1645 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1646                      struct nlmsghdr *nlh, struct nlattr *cda[])
1647 {
1648         struct nf_conntrack_expect *exp;
1649         struct nf_conntrack_tuple tuple;
1650         struct nf_conntrack_helper *h;
1651         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1652         struct hlist_node *n, *next;
1653         u_int8_t u3 = nfmsg->nfgen_family;
1654         unsigned int i;
1655         int err;
1656
1657         if (cda[CTA_EXPECT_TUPLE]) {
1658                 /* delete a single expect by tuple */
1659                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1660                 if (err < 0)
1661                         return err;
1662
1663                 /* bump usage count to 2 */
1664                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1665                 if (!exp)
1666                         return -ENOENT;
1667
1668                 if (cda[CTA_EXPECT_ID]) {
1669                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1670                         if (ntohl(id) != (u32)(unsigned long)exp) {
1671                                 nf_ct_expect_put(exp);
1672                                 return -ENOENT;
1673                         }
1674                 }
1675
1676                 /* after list removal, usage count == 1 */
1677                 nf_ct_unexpect_related(exp);
1678                 /* have to put what we 'get' above.
1679                  * after this line usage count == 0 */
1680                 nf_ct_expect_put(exp);
1681         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1682                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1683                 struct nf_conn_help *m_help;
1684
1685                 /* delete all expectations for this helper */
1686                 spin_lock_bh(&nf_conntrack_lock);
1687                 h = __nf_conntrack_helper_find_byname(name);
1688                 if (!h) {
1689                         spin_unlock_bh(&nf_conntrack_lock);
1690                         return -EOPNOTSUPP;
1691                 }
1692                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1693                         hlist_for_each_entry_safe(exp, n, next,
1694                                                   &init_net.ct.expect_hash[i],
1695                                                   hnode) {
1696                                 m_help = nfct_help(exp->master);
1697                                 if (m_help->helper == h
1698                                     && del_timer(&exp->timeout)) {
1699                                         nf_ct_unlink_expect(exp);
1700                                         nf_ct_expect_put(exp);
1701                                 }
1702                         }
1703                 }
1704                 spin_unlock_bh(&nf_conntrack_lock);
1705         } else {
1706                 /* This basically means we have to flush everything*/
1707                 spin_lock_bh(&nf_conntrack_lock);
1708                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1709                         hlist_for_each_entry_safe(exp, n, next,
1710                                                   &init_net.ct.expect_hash[i],
1711                                                   hnode) {
1712                                 if (del_timer(&exp->timeout)) {
1713                                         nf_ct_unlink_expect(exp);
1714                                         nf_ct_expect_put(exp);
1715                                 }
1716                         }
1717                 }
1718                 spin_unlock_bh(&nf_conntrack_lock);
1719         }
1720
1721         return 0;
1722 }
1723 static int
1724 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1725 {
1726         return -EOPNOTSUPP;
1727 }
1728
1729 static int
1730 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1731 {
1732         struct nf_conntrack_tuple tuple, mask, master_tuple;
1733         struct nf_conntrack_tuple_hash *h = NULL;
1734         struct nf_conntrack_expect *exp;
1735         struct nf_conn *ct;
1736         struct nf_conn_help *help;
1737         int err = 0;
1738
1739         /* caller guarantees that those three CTA_EXPECT_* exist */
1740         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1741         if (err < 0)
1742                 return err;
1743         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1744         if (err < 0)
1745                 return err;
1746         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1747         if (err < 0)
1748                 return err;
1749
1750         /* Look for master conntrack of this expectation */
1751         h = nf_conntrack_find_get(&init_net, &master_tuple);
1752         if (!h)
1753                 return -ENOENT;
1754         ct = nf_ct_tuplehash_to_ctrack(h);
1755         help = nfct_help(ct);
1756
1757         if (!help || !help->helper) {
1758                 /* such conntrack hasn't got any helper, abort */
1759                 err = -EOPNOTSUPP;
1760                 goto out;
1761         }
1762
1763         exp = nf_ct_expect_alloc(ct);
1764         if (!exp) {
1765                 err = -ENOMEM;
1766                 goto out;
1767         }
1768
1769         exp->expectfn = NULL;
1770         exp->flags = 0;
1771         exp->master = ct;
1772         exp->helper = NULL;
1773         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1774         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1775         exp->mask.src.u.all = mask.src.u.all;
1776
1777         err = nf_ct_expect_related_report(exp, pid, report);
1778         nf_ct_expect_put(exp);
1779
1780 out:
1781         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1782         return err;
1783 }
1784
1785 static int
1786 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1787                      struct nlmsghdr *nlh, struct nlattr *cda[])
1788 {
1789         struct nf_conntrack_tuple tuple;
1790         struct nf_conntrack_expect *exp;
1791         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1792         u_int8_t u3 = nfmsg->nfgen_family;
1793         int err = 0;
1794
1795         if (!cda[CTA_EXPECT_TUPLE]
1796             || !cda[CTA_EXPECT_MASK]
1797             || !cda[CTA_EXPECT_MASTER])
1798                 return -EINVAL;
1799
1800         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1801         if (err < 0)
1802                 return err;
1803
1804         spin_lock_bh(&nf_conntrack_lock);
1805         exp = __nf_ct_expect_find(&init_net, &tuple);
1806
1807         if (!exp) {
1808                 spin_unlock_bh(&nf_conntrack_lock);
1809                 err = -ENOENT;
1810                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1811                         err = ctnetlink_create_expect(cda,
1812                                                       u3,
1813                                                       NETLINK_CB(skb).pid,
1814                                                       nlmsg_report(nlh));
1815                 }
1816                 return err;
1817         }
1818
1819         err = -EEXIST;
1820         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1821                 err = ctnetlink_change_expect(exp, cda);
1822         spin_unlock_bh(&nf_conntrack_lock);
1823
1824         return err;
1825 }
1826
1827 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1828 static struct notifier_block ctnl_notifier = {
1829         .notifier_call  = ctnetlink_conntrack_event,
1830 };
1831
1832 static struct notifier_block ctnl_notifier_exp = {
1833         .notifier_call  = ctnetlink_expect_event,
1834 };
1835 #endif
1836
1837 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1838         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1839                                             .attr_count = CTA_MAX,
1840                                             .policy = ct_nla_policy },
1841         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1842                                             .attr_count = CTA_MAX,
1843                                             .policy = ct_nla_policy },
1844         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1845                                             .attr_count = CTA_MAX,
1846                                             .policy = ct_nla_policy },
1847         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1848                                             .attr_count = CTA_MAX,
1849                                             .policy = ct_nla_policy },
1850 };
1851
1852 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1853         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1854                                             .attr_count = CTA_EXPECT_MAX,
1855                                             .policy = exp_nla_policy },
1856         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1857                                             .attr_count = CTA_EXPECT_MAX,
1858                                             .policy = exp_nla_policy },
1859         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1860                                             .attr_count = CTA_EXPECT_MAX,
1861                                             .policy = exp_nla_policy },
1862 };
1863
1864 static const struct nfnetlink_subsystem ctnl_subsys = {
1865         .name                           = "conntrack",
1866         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1867         .cb_count                       = IPCTNL_MSG_MAX,
1868         .cb                             = ctnl_cb,
1869 };
1870
1871 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1872         .name                           = "conntrack_expect",
1873         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1874         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1875         .cb                             = ctnl_exp_cb,
1876 };
1877
1878 MODULE_ALIAS("ip_conntrack_netlink");
1879 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1880 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1881
1882 static int __init ctnetlink_init(void)
1883 {
1884         int ret;
1885
1886         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1887         ret = nfnetlink_subsys_register(&ctnl_subsys);
1888         if (ret < 0) {
1889                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1890                 goto err_out;
1891         }
1892
1893         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1894         if (ret < 0) {
1895                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1896                 goto err_unreg_subsys;
1897         }
1898
1899 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1900         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1901         if (ret < 0) {
1902                 printk("ctnetlink_init: cannot register notifier.\n");
1903                 goto err_unreg_exp_subsys;
1904         }
1905
1906         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1907         if (ret < 0) {
1908                 printk("ctnetlink_init: cannot expect register notifier.\n");
1909                 goto err_unreg_notifier;
1910         }
1911 #endif
1912
1913         return 0;
1914
1915 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1916 err_unreg_notifier:
1917         nf_conntrack_unregister_notifier(&ctnl_notifier);
1918 err_unreg_exp_subsys:
1919         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1920 #endif
1921 err_unreg_subsys:
1922         nfnetlink_subsys_unregister(&ctnl_subsys);
1923 err_out:
1924         return ret;
1925 }
1926
1927 static void __exit ctnetlink_exit(void)
1928 {
1929         printk("ctnetlink: unregistering from nfnetlink.\n");
1930
1931 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1932         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1933         nf_conntrack_unregister_notifier(&ctnl_notifier);
1934 #endif
1935
1936         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1937         nfnetlink_subsys_unregister(&ctnl_subsys);
1938         return;
1939 }
1940
1941 module_init(ctnetlink_init);
1942 module_exit(ctnetlink_exit);