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 (!item->report && !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         rcu_read_lock();
 603         l3proto = __nf_ct_l3proto_find(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         rcu_read_unlock();
 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         rcu_read_lock();
 638         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 639
 640         if (likely(l4proto->nlattr_to_tuple)) {
 641                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 642                                           l4proto->nla_policy);
 643                 if (ret == 0)
 644                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 645         }
 646
 647         rcu_read_unlock();
 648
 649         return ret;
 650 }
 651
 652 static int
 653 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 654                       enum ctattr_tuple type, u_int8_t l3num)
 655 {
 656         struct nlattr *tb[CTA_TUPLE_MAX+1];
 657         int err;
 658
 659         memset(tuple, 0, sizeof(*tuple));
 660
 661         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 662
 663         if (!tb[CTA_TUPLE_IP])
 664                 return -EINVAL;
 665
 666         tuple->src.l3num = l3num;
 667
 668         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 669         if (err < 0)
 670                 return err;
 671
 672         if (!tb[CTA_TUPLE_PROTO])
 673                 return -EINVAL;
 674
 675         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 676         if (err < 0)
 677                 return err;
 678
 679         /* orig and expect tuples get DIR_ORIGINAL */
 680         if (type == CTA_TUPLE_REPLY)
 681                 tuple->dst.dir = IP_CT_DIR_REPLY;
 682         else
 683                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 684
 685         return 0;
 686 }
 687
 688 static inline int
 689 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 690 {
 691         struct nlattr *tb[CTA_HELP_MAX+1];
 692
 693         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 694
 695         if (!tb[CTA_HELP_NAME])
 696                 return -EINVAL;
 697
 698         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 699
 700         return 0;
 701 }
 702
 703 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 704         [CTA_STATUS]            = { .type = NLA_U32 },
 705         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 706         [CTA_MARK]              = { .type = NLA_U32 },
 707         [CTA_USE]               = { .type = NLA_U32 },
 708         [CTA_ID]                = { .type = NLA_U32 },
 709 };
 710
 711 static int
 712 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 713                         struct nlmsghdr *nlh, struct nlattr *cda[])
 714 {
 715         struct nf_conntrack_tuple_hash *h;
 716         struct nf_conntrack_tuple tuple;
 717         struct nf_conn *ct;
 718         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 719         u_int8_t u3 = nfmsg->nfgen_family;
 720         int err = 0;
 721
 722         if (cda[CTA_TUPLE_ORIG])
 723                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 724         else if (cda[CTA_TUPLE_REPLY])
 725                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 726         else {
 727                 /* Flush the whole table */
 728                 nf_conntrack_flush(&init_net,
 729                                    NETLINK_CB(skb).pid,
 730                                    nlmsg_report(nlh));
 731                 return 0;
 732         }
 733
 734         if (err < 0)
 735                 return err;
 736
 737         h = nf_conntrack_find_get(&init_net, &tuple);
 738         if (!h)
 739                 return -ENOENT;
 740
 741         ct = nf_ct_tuplehash_to_ctrack(h);
 742
 743         if (cda[CTA_ID]) {
 744                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 745                 if (id != (u32)(unsigned long)ct) {
 746                         nf_ct_put(ct);
 747                         return -ENOENT;
 748                 }
 749         }
 750
 751         nf_conntrack_event_report(IPCT_DESTROY,
 752                                   ct,
 753                                   NETLINK_CB(skb).pid,
 754                                   nlmsg_report(nlh));
 755
 756         /* death_by_timeout would report the event again */
 757         set_bit(IPS_DYING_BIT, &ct->status);
 758
 759         nf_ct_kill(ct);
 760         nf_ct_put(ct);
 761
 762         return 0;
 763 }
 764
 765 static int
 766 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 767                         struct nlmsghdr *nlh, struct nlattr *cda[])
 768 {
 769         struct nf_conntrack_tuple_hash *h;
 770         struct nf_conntrack_tuple tuple;
 771         struct nf_conn *ct;
 772         struct sk_buff *skb2 = NULL;
 773         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 774         u_int8_t u3 = nfmsg->nfgen_family;
 775         int err = 0;
 776
 777         if (nlh->nlmsg_flags & NLM_F_DUMP)
 778                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 779                                           ctnetlink_done);
 780
 781         if (cda[CTA_TUPLE_ORIG])
 782                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 783         else if (cda[CTA_TUPLE_REPLY])
 784                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 785         else
 786                 return -EINVAL;
 787
 788         if (err < 0)
 789                 return err;
 790
 791         h = nf_conntrack_find_get(&init_net, &tuple);
 792         if (!h)
 793                 return -ENOENT;
 794
 795         ct = nf_ct_tuplehash_to_ctrack(h);
 796
 797         err = -ENOMEM;
 798         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 799         if (!skb2) {
 800                 nf_ct_put(ct);
 801                 return -ENOMEM;
 802         }
 803
 804         rcu_read_lock();
 805         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 806                                   IPCTNL_MSG_CT_NEW, 1, ct);
 807         rcu_read_unlock();
 808         nf_ct_put(ct);
 809         if (err <= 0)
 810                 goto free;
 811
 812         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 813         if (err < 0)
 814                 goto out;
 815
 816         return 0;
 817
 818 free:
 819         kfree_skb(skb2);
 820 out:
 821         return err;
 822 }
 823
 824 #ifdef CONFIG_NF_NAT_NEEDED
 825 static int
 826 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 827                           enum nf_nat_manip_type manip,
 828                           struct nlattr *attr)
 829 {
 830         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 831
 832         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 833         if (!parse_nat_setup) {
 834 #ifdef CONFIG_MODULES
 835                 rcu_read_unlock();
 836                 spin_unlock_bh(&nf_conntrack_lock);
 837                 nfnl_unlock();
 838                 if (request_module("nf-nat-ipv4") < 0) {
 839                         nfnl_lock();
 840                         spin_lock_bh(&nf_conntrack_lock);
 841                         rcu_read_lock();
 842                         return -EOPNOTSUPP;
 843                 }
 844                 nfnl_lock();
 845                 spin_lock_bh(&nf_conntrack_lock);
 846                 rcu_read_lock();
 847                 if (nfnetlink_parse_nat_setup_hook)
 848                         return -EAGAIN;
 849 #endif
 850                 return -EOPNOTSUPP;
 851         }
 852
 853         return parse_nat_setup(ct, manip, attr);
 854 }
 855 #endif
 856
 857 static int
 858 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 859 {
 860         unsigned long d;
 861         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 862         d = ct->status ^ status;
 863
 864         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 865                 /* unchangeable */
 866                 return -EBUSY;
 867
 868         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 869                 /* SEEN_REPLY bit can only be set */
 870                 return -EBUSY;
 871
 872         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 873                 /* ASSURED bit can only be set */
 874                 return -EBUSY;
 875
 876         /* Be careful here, modifying NAT bits can screw up things,
 877          * so don't let users modify them directly if they don't pass
 878          * nf_nat_range. */
 879         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 880         return 0;
 881 }
 882
 883 static int
 884 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 885 {
 886 #ifdef CONFIG_NF_NAT_NEEDED
 887         int ret;
 888
 889         if (cda[CTA_NAT_DST]) {
 890                 ret = ctnetlink_parse_nat_setup(ct,
 891                                                 IP_NAT_MANIP_DST,
 892                                                 cda[CTA_NAT_DST]);
 893                 if (ret < 0)
 894                         return ret;
 895         }
 896         if (cda[CTA_NAT_SRC]) {
 897                 ret = ctnetlink_parse_nat_setup(ct,
 898                                                 IP_NAT_MANIP_SRC,
 899                                                 cda[CTA_NAT_SRC]);
 900                 if (ret < 0)
 901                         return ret;
 902         }
 903         return 0;
 904 #else
 905         return -EOPNOTSUPP;
 906 #endif
 907 }
 908
 909 static inline int
 910 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 911 {
 912         struct nf_conntrack_helper *helper;
 913         struct nf_conn_help *help = nfct_help(ct);
 914         char *helpname;
 915         int err;
 916
 917         /* don't change helper of sibling connections */
 918         if (ct->master)
 919                 return -EBUSY;
 920
 921         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 922         if (err < 0)
 923                 return err;
 924
 925         if (!strcmp(helpname, "")) {
 926                 if (help && help->helper) {
 927                         /* we had a helper before ... */
 928                         nf_ct_remove_expectations(ct);
 929                         rcu_assign_pointer(help->helper, NULL);
 930                 }
 931
 932                 return 0;
 933         }
 934
 935         helper = __nf_conntrack_helper_find_byname(helpname);
 936         if (helper == NULL) {
 937 #ifdef CONFIG_MODULES
 938                 spin_unlock_bh(&nf_conntrack_lock);
 939
 940                 if (request_module("nfct-helper-%s", helpname) < 0) {
 941                         spin_lock_bh(&nf_conntrack_lock);
 942                         return -EOPNOTSUPP;
 943                 }
 944
 945                 spin_lock_bh(&nf_conntrack_lock);
 946                 helper = __nf_conntrack_helper_find_byname(helpname);
 947                 if (helper)
 948                         return -EAGAIN;
 949 #endif
 950                 return -EOPNOTSUPP;
 951         }
 952
 953         if (help) {
 954                 if (help->helper == helper)
 955                         return 0;
 956                 if (help->helper)
 957                         return -EBUSY;
 958                 /* need to zero data of old helper */
 959                 memset(&help->help, 0, sizeof(help->help));
 960         } else {
 961                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
 962                 if (help == NULL)
 963                         return -ENOMEM;
 964         }
 965
 966         rcu_assign_pointer(help->helper, helper);
 967
 968         return 0;
 969 }
 970
 971 static inline int
 972 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 973 {
 974         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 975
 976         if (!del_timer(&ct->timeout))
 977                 return -ETIME;
 978
 979         ct->timeout.expires = jiffies + timeout * HZ;
 980         add_timer(&ct->timeout);
 981
 982         return 0;
 983 }
 984
 985 static inline int
 986 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 987 {
 988         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
 989         struct nf_conntrack_l4proto *l4proto;
 990         int err = 0;
 991
 992         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 993
 994         rcu_read_lock();
 995         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 996         if (l4proto->from_nlattr)
 997                 err = l4proto->from_nlattr(tb, ct);
 998         rcu_read_unlock();
 999
1000         return err;
1001 }
1002
1003 #ifdef CONFIG_NF_NAT_NEEDED
1004 static inline int
1005 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1006 {
1007         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1008
1009         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1010
1011         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1012                 return -EINVAL;
1013
1014         natseq->correction_pos =
1015                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1016
1017         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1018                 return -EINVAL;
1019
1020         natseq->offset_before =
1021                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1022
1023         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1024                 return -EINVAL;
1025
1026         natseq->offset_after =
1027                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1028
1029         return 0;
1030 }
1031
1032 static int
1033 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1034 {
1035         int ret = 0;
1036         struct nf_conn_nat *nat = nfct_nat(ct);
1037
1038         if (!nat)
1039                 return 0;
1040
1041         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1042                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1043                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1044                 if (ret < 0)
1045                         return ret;
1046
1047                 ct->status |= IPS_SEQ_ADJUST;
1048         }
1049
1050         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1051                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1052                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1053                 if (ret < 0)
1054                         return ret;
1055
1056                 ct->status |= IPS_SEQ_ADJUST;
1057         }
1058
1059         return 0;
1060 }
1061 #endif
1062
1063 static int
1064 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1065 {
1066         int err;
1067
1068         /* only allow NAT changes and master assignation for new conntracks */
1069         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1070                 return -EOPNOTSUPP;
1071
1072         if (cda[CTA_HELP]) {
1073                 err = ctnetlink_change_helper(ct, cda);
1074                 if (err < 0)
1075                         return err;
1076         }
1077
1078         if (cda[CTA_TIMEOUT]) {
1079                 err = ctnetlink_change_timeout(ct, cda);
1080                 if (err < 0)
1081                         return err;
1082         }
1083
1084         if (cda[CTA_STATUS]) {
1085                 err = ctnetlink_change_status(ct, cda);
1086                 if (err < 0)
1087                         return err;
1088         }
1089
1090         if (cda[CTA_PROTOINFO]) {
1091                 err = ctnetlink_change_protoinfo(ct, cda);
1092                 if (err < 0)
1093                         return err;
1094         }
1095
1096 #if defined(CONFIG_NF_CONNTRACK_MARK)
1097         if (cda[CTA_MARK])
1098                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1099 #endif
1100
1101 #ifdef CONFIG_NF_NAT_NEEDED
1102         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1103                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1104                 if (err < 0)
1105                         return err;
1106         }
1107 #endif
1108
1109         return 0;
1110 }
1111
1112 static inline void
1113 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1114 {
1115         unsigned int events = 0;
1116
1117         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1118                 events |= IPCT_RELATED;
1119         else
1120                 events |= IPCT_NEW;
1121
1122         nf_conntrack_event_report(IPCT_STATUS |
1123                                   IPCT_HELPER |
1124                                   IPCT_REFRESH |
1125                                   IPCT_PROTOINFO |
1126                                   IPCT_NATSEQADJ |
1127                                   IPCT_MARK |
1128                                   events,
1129                                   ct,
1130                                   pid,
1131                                   report);
1132 }
1133
1134 static struct nf_conn *
1135 ctnetlink_create_conntrack(struct nlattr *cda[],
1136                            struct nf_conntrack_tuple *otuple,
1137                            struct nf_conntrack_tuple *rtuple,
1138                            u8 u3)
1139 {
1140         struct nf_conn *ct;
1141         int err = -EINVAL;
1142         struct nf_conntrack_helper *helper;
1143
1144         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1145         if (IS_ERR(ct))
1146                 return ERR_PTR(-ENOMEM);
1147
1148         if (!cda[CTA_TIMEOUT])
1149                 goto err1;
1150         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1151
1152         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1153         ct->status |= IPS_CONFIRMED;
1154
1155         rcu_read_lock();
1156         if (cda[CTA_HELP]) {
1157                 char *helpname;
1158
1159                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1160                 if (err < 0)
1161                         goto err2;
1162
1163                 helper = __nf_conntrack_helper_find_byname(helpname);
1164                 if (helper == NULL) {
1165                         rcu_read_unlock();
1166 #ifdef CONFIG_MODULES
1167                         if (request_module("nfct-helper-%s", helpname) < 0) {
1168                                 err = -EOPNOTSUPP;
1169                                 goto err1;
1170                         }
1171
1172                         rcu_read_lock();
1173                         helper = __nf_conntrack_helper_find_byname(helpname);
1174                         if (helper) {
1175                                 err = -EAGAIN;
1176                                 goto err2;
1177                         }
1178                         rcu_read_unlock();
1179 #endif
1180                         err = -EOPNOTSUPP;
1181                         goto err1;
1182                 } else {
1183                         struct nf_conn_help *help;
1184
1185                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1186                         if (help == NULL) {
1187                                 err = -ENOMEM;
1188                                 goto err2;
1189                         }
1190
1191                         /* not in hash table yet so not strictly necessary */
1192                         rcu_assign_pointer(help->helper, helper);
1193                 }
1194         } else {
1195                 /* try an implicit helper assignation */
1196                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1197                 if (err < 0)
1198                         goto err2;
1199         }
1200
1201         if (cda[CTA_STATUS]) {
1202                 err = ctnetlink_change_status(ct, cda);
1203                 if (err < 0)
1204                         goto err2;
1205         }
1206
1207         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1208                 err = ctnetlink_change_nat(ct, cda);
1209                 if (err < 0)
1210                         goto err2;
1211         }
1212
1213 #ifdef CONFIG_NF_NAT_NEEDED
1214         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1215                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1216                 if (err < 0)
1217                         goto err2;
1218         }
1219 #endif
1220
1221         if (cda[CTA_PROTOINFO]) {
1222                 err = ctnetlink_change_protoinfo(ct, cda);
1223                 if (err < 0)
1224                         goto err2;
1225         }
1226
1227         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1228
1229 #if defined(CONFIG_NF_CONNTRACK_MARK)
1230         if (cda[CTA_MARK])
1231                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1232 #endif
1233
1234         /* setup master conntrack: this is a confirmed expectation */
1235         if (cda[CTA_TUPLE_MASTER]) {
1236                 struct nf_conntrack_tuple master;
1237                 struct nf_conntrack_tuple_hash *master_h;
1238                 struct nf_conn *master_ct;
1239
1240                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1241                 if (err < 0)
1242                         goto err2;
1243
1244                 master_h = __nf_conntrack_find(&init_net, &master);
1245                 if (master_h == NULL) {
1246                         err = -ENOENT;
1247                         goto err2;
1248                 }
1249                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1250                 nf_conntrack_get(&master_ct->ct_general);
1251                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1252                 ct->master = master_ct;
1253         }
1254
1255         add_timer(&ct->timeout);
1256         nf_conntrack_hash_insert(ct);
1257         rcu_read_unlock();
1258
1259         return ct;
1260
1261 err2:
1262         rcu_read_unlock();
1263 err1:
1264         nf_conntrack_free(ct);
1265         return ERR_PTR(err);
1266 }
1267
1268 static int
1269 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1270                         struct nlmsghdr *nlh, struct nlattr *cda[])
1271 {
1272         struct nf_conntrack_tuple otuple, rtuple;
1273         struct nf_conntrack_tuple_hash *h = NULL;
1274         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1275         u_int8_t u3 = nfmsg->nfgen_family;
1276         int err = 0;
1277
1278         if (cda[CTA_TUPLE_ORIG]) {
1279                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1280                 if (err < 0)
1281                         return err;
1282         }
1283
1284         if (cda[CTA_TUPLE_REPLY]) {
1285                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1286                 if (err < 0)
1287                         return err;
1288         }
1289
1290         spin_lock_bh(&nf_conntrack_lock);
1291         if (cda[CTA_TUPLE_ORIG])
1292                 h = __nf_conntrack_find(&init_net, &otuple);
1293         else if (cda[CTA_TUPLE_REPLY])
1294                 h = __nf_conntrack_find(&init_net, &rtuple);
1295
1296         if (h == NULL) {
1297                 err = -ENOENT;
1298                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1299                         struct nf_conn *ct;
1300
1301                         ct = ctnetlink_create_conntrack(cda, &otuple,
1302                                                         &rtuple, u3);
1303                         if (IS_ERR(ct)) {
1304                                 err = PTR_ERR(ct);
1305                                 goto out_unlock;
1306                         }
1307                         err = 0;
1308                         nf_conntrack_get(&ct->ct_general);
1309                         spin_unlock_bh(&nf_conntrack_lock);
1310                         ctnetlink_event_report(ct,
1311                                                NETLINK_CB(skb).pid,
1312                                                nlmsg_report(nlh));
1313                         nf_ct_put(ct);
1314                 } else
1315                         spin_unlock_bh(&nf_conntrack_lock);
1316
1317                 return err;
1318         }
1319         /* implicit 'else' */
1320
1321         /* We manipulate the conntrack inside the global conntrack table lock,
1322          * so there's no need to increase the refcount */
1323         err = -EEXIST;
1324         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1325                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1326
1327                 err = ctnetlink_change_conntrack(ct, cda);
1328                 if (err == 0) {
1329                         nf_conntrack_get(&ct->ct_general);
1330                         spin_unlock_bh(&nf_conntrack_lock);
1331                         ctnetlink_event_report(ct,
1332                                                NETLINK_CB(skb).pid,
1333                                                nlmsg_report(nlh));
1334                         nf_ct_put(ct);
1335                 } else
1336                         spin_unlock_bh(&nf_conntrack_lock);
1337
1338                 return err;
1339         }
1340
1341 out_unlock:
1342         spin_unlock_bh(&nf_conntrack_lock);
1343         return err;
1344 }
1345
1346 /***********************************************************************
1347  * EXPECT
1348  ***********************************************************************/
1349
1350 static inline int
1351 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1352                          const struct nf_conntrack_tuple *tuple,
1353                          enum ctattr_expect type)
1354 {
1355         struct nlattr *nest_parms;
1356
1357         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1358         if (!nest_parms)
1359                 goto nla_put_failure;
1360         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1361                 goto nla_put_failure;
1362         nla_nest_end(skb, nest_parms);
1363
1364         return 0;
1365
1366 nla_put_failure:
1367         return -1;
1368 }
1369
1370 static inline int
1371 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1372                         const struct nf_conntrack_tuple *tuple,
1373                         const struct nf_conntrack_tuple_mask *mask)
1374 {
1375         int ret;
1376         struct nf_conntrack_l3proto *l3proto;
1377         struct nf_conntrack_l4proto *l4proto;
1378         struct nf_conntrack_tuple m;
1379         struct nlattr *nest_parms;
1380
1381         memset(&m, 0xFF, sizeof(m));
1382         m.src.u.all = mask->src.u.all;
1383         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1384
1385         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1386         if (!nest_parms)
1387                 goto nla_put_failure;
1388
1389         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1390         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1391
1392         if (unlikely(ret < 0))
1393                 goto nla_put_failure;
1394
1395         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1396         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1397         if (unlikely(ret < 0))
1398                 goto nla_put_failure;
1399
1400         nla_nest_end(skb, nest_parms);
1401
1402         return 0;
1403
1404 nla_put_failure:
1405         return -1;
1406 }
1407
1408 static int
1409 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1410                           const struct nf_conntrack_expect *exp)
1411 {
1412         struct nf_conn *master = exp->master;
1413         long timeout = (exp->timeout.expires - jiffies) / HZ;
1414
1415         if (timeout < 0)
1416                 timeout = 0;
1417
1418         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1419                 goto nla_put_failure;
1420         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1421                 goto nla_put_failure;
1422         if (ctnetlink_exp_dump_tuple(skb,
1423                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1424                                  CTA_EXPECT_MASTER) < 0)
1425                 goto nla_put_failure;
1426
1427         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1428         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1429
1430         return 0;
1431
1432 nla_put_failure:
1433         return -1;
1434 }
1435
1436 static int
1437 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1438                     int event,
1439                     int nowait,
1440                     const struct nf_conntrack_expect *exp)
1441 {
1442         struct nlmsghdr *nlh;
1443         struct nfgenmsg *nfmsg;
1444         unsigned char *b = skb_tail_pointer(skb);
1445
1446         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1447         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1448         nfmsg  = NLMSG_DATA(nlh);
1449
1450         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1451         nfmsg->nfgen_family = exp->tuple.src.l3num;
1452         nfmsg->version      = NFNETLINK_V0;
1453         nfmsg->res_id       = 0;
1454
1455         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1456                 goto nla_put_failure;
1457
1458         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1459         return skb->len;
1460
1461 nlmsg_failure:
1462 nla_put_failure:
1463         nlmsg_trim(skb, b);
1464         return -1;
1465 }
1466
1467 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1468 static int ctnetlink_expect_event(struct notifier_block *this,
1469                                   unsigned long events, void *ptr)
1470 {
1471         struct nlmsghdr *nlh;
1472         struct nfgenmsg *nfmsg;
1473         struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1474         struct nf_conntrack_expect *exp = item->exp;
1475         struct sk_buff *skb;
1476         unsigned int type;
1477         sk_buff_data_t b;
1478         int flags = 0;
1479
1480         if (events & IPEXP_NEW) {
1481                 type = IPCTNL_MSG_EXP_NEW;
1482                 flags = NLM_F_CREATE|NLM_F_EXCL;
1483         } else
1484                 return NOTIFY_DONE;
1485
1486         if (!item->report &&
1487             !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1488                 return NOTIFY_DONE;
1489
1490         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1491         if (!skb)
1492                 return NOTIFY_DONE;
1493
1494         b = skb->tail;
1495
1496         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1497         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1498         nfmsg = NLMSG_DATA(nlh);
1499
1500         nlh->nlmsg_flags    = flags;
1501         nfmsg->nfgen_family = exp->tuple.src.l3num;
1502         nfmsg->version      = NFNETLINK_V0;
1503         nfmsg->res_id       = 0;
1504
1505         rcu_read_lock();
1506         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1507                 goto nla_put_failure;
1508         rcu_read_unlock();
1509
1510         nlh->nlmsg_len = skb->tail - b;
1511         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1512         return NOTIFY_DONE;
1513
1514 nla_put_failure:
1515         rcu_read_unlock();
1516 nlmsg_failure:
1517         kfree_skb(skb);
1518         return NOTIFY_DONE;
1519 }
1520 #endif
1521 static int ctnetlink_exp_done(struct netlink_callback *cb)
1522 {
1523         if (cb->args[1])
1524                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1525         return 0;
1526 }
1527
1528 static int
1529 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1530 {
1531         struct net *net = &init_net;
1532         struct nf_conntrack_expect *exp, *last;
1533         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1534         struct hlist_node *n;
1535         u_int8_t l3proto = nfmsg->nfgen_family;
1536
1537         rcu_read_lock();
1538         last = (struct nf_conntrack_expect *)cb->args[1];
1539         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1540 restart:
1541                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1542                                      hnode) {
1543                         if (l3proto && exp->tuple.src.l3num != l3proto)
1544                                 continue;
1545                         if (cb->args[1]) {
1546                                 if (exp != last)
1547                                         continue;
1548                                 cb->args[1] = 0;
1549                         }
1550                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1551                                                     cb->nlh->nlmsg_seq,
1552                                                     IPCTNL_MSG_EXP_NEW,
1553                                                     1, exp) < 0) {
1554                                 if (!atomic_inc_not_zero(&exp->use))
1555                                         continue;
1556                                 cb->args[1] = (unsigned long)exp;
1557                                 goto out;
1558                         }
1559                 }
1560                 if (cb->args[1]) {
1561                         cb->args[1] = 0;
1562                         goto restart;
1563                 }
1564         }
1565 out:
1566         rcu_read_unlock();
1567         if (last)
1568                 nf_ct_expect_put(last);
1569
1570         return skb->len;
1571 }
1572
1573 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1574         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1575         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1576 };
1577
1578 static int
1579 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1580                      struct nlmsghdr *nlh, struct nlattr *cda[])
1581 {
1582         struct nf_conntrack_tuple tuple;
1583         struct nf_conntrack_expect *exp;
1584         struct sk_buff *skb2;
1585         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1586         u_int8_t u3 = nfmsg->nfgen_family;
1587         int err = 0;
1588
1589         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1590                 return netlink_dump_start(ctnl, skb, nlh,
1591                                           ctnetlink_exp_dump_table,
1592                                           ctnetlink_exp_done);
1593         }
1594
1595         if (cda[CTA_EXPECT_MASTER])
1596                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1597         else
1598                 return -EINVAL;
1599
1600         if (err < 0)
1601                 return err;
1602
1603         exp = nf_ct_expect_find_get(&init_net, &tuple);
1604         if (!exp)
1605                 return -ENOENT;
1606
1607         if (cda[CTA_EXPECT_ID]) {
1608                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1609                 if (ntohl(id) != (u32)(unsigned long)exp) {
1610                         nf_ct_expect_put(exp);
1611                         return -ENOENT;
1612                 }
1613         }
1614
1615         err = -ENOMEM;
1616         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1617         if (!skb2)
1618                 goto out;
1619
1620         rcu_read_lock();
1621         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1622                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1623                                       1, exp);
1624         rcu_read_unlock();
1625         if (err <= 0)
1626                 goto free;
1627
1628         nf_ct_expect_put(exp);
1629
1630         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1631
1632 free:
1633         kfree_skb(skb2);
1634 out:
1635         nf_ct_expect_put(exp);
1636         return err;
1637 }
1638
1639 static int
1640 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1641                      struct nlmsghdr *nlh, struct nlattr *cda[])
1642 {
1643         struct nf_conntrack_expect *exp;
1644         struct nf_conntrack_tuple tuple;
1645         struct nf_conntrack_helper *h;
1646         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1647         struct hlist_node *n, *next;
1648         u_int8_t u3 = nfmsg->nfgen_family;
1649         unsigned int i;
1650         int err;
1651
1652         if (cda[CTA_EXPECT_TUPLE]) {
1653                 /* delete a single expect by tuple */
1654                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1655                 if (err < 0)
1656                         return err;
1657
1658                 /* bump usage count to 2 */
1659                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1660                 if (!exp)
1661                         return -ENOENT;
1662
1663                 if (cda[CTA_EXPECT_ID]) {
1664                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1665                         if (ntohl(id) != (u32)(unsigned long)exp) {
1666                                 nf_ct_expect_put(exp);
1667                                 return -ENOENT;
1668                         }
1669                 }
1670
1671                 /* after list removal, usage count == 1 */
1672                 nf_ct_unexpect_related(exp);
1673                 /* have to put what we 'get' above.
1674                  * after this line usage count == 0 */
1675                 nf_ct_expect_put(exp);
1676         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1677                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1678                 struct nf_conn_help *m_help;
1679
1680                 /* delete all expectations for this helper */
1681                 spin_lock_bh(&nf_conntrack_lock);
1682                 h = __nf_conntrack_helper_find_byname(name);
1683                 if (!h) {
1684                         spin_unlock_bh(&nf_conntrack_lock);
1685                         return -EOPNOTSUPP;
1686                 }
1687                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1688                         hlist_for_each_entry_safe(exp, n, next,
1689                                                   &init_net.ct.expect_hash[i],
1690                                                   hnode) {
1691                                 m_help = nfct_help(exp->master);
1692                                 if (m_help->helper == h
1693                                     && del_timer(&exp->timeout)) {
1694                                         nf_ct_unlink_expect(exp);
1695                                         nf_ct_expect_put(exp);
1696                                 }
1697                         }
1698                 }
1699                 spin_unlock_bh(&nf_conntrack_lock);
1700         } else {
1701                 /* This basically means we have to flush everything*/
1702                 spin_lock_bh(&nf_conntrack_lock);
1703                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1704                         hlist_for_each_entry_safe(exp, n, next,
1705                                                   &init_net.ct.expect_hash[i],
1706                                                   hnode) {
1707                                 if (del_timer(&exp->timeout)) {
1708                                         nf_ct_unlink_expect(exp);
1709                                         nf_ct_expect_put(exp);
1710                                 }
1711                         }
1712                 }
1713                 spin_unlock_bh(&nf_conntrack_lock);
1714         }
1715
1716         return 0;
1717 }
1718 static int
1719 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1720 {
1721         return -EOPNOTSUPP;
1722 }
1723
1724 static int
1725 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1726 {
1727         struct nf_conntrack_tuple tuple, mask, master_tuple;
1728         struct nf_conntrack_tuple_hash *h = NULL;
1729         struct nf_conntrack_expect *exp;
1730         struct nf_conn *ct;
1731         struct nf_conn_help *help;
1732         int err = 0;
1733
1734         /* caller guarantees that those three CTA_EXPECT_* exist */
1735         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1736         if (err < 0)
1737                 return err;
1738         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1739         if (err < 0)
1740                 return err;
1741         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1742         if (err < 0)
1743                 return err;
1744
1745         /* Look for master conntrack of this expectation */
1746         h = nf_conntrack_find_get(&init_net, &master_tuple);
1747         if (!h)
1748                 return -ENOENT;
1749         ct = nf_ct_tuplehash_to_ctrack(h);
1750         help = nfct_help(ct);
1751
1752         if (!help || !help->helper) {
1753                 /* such conntrack hasn't got any helper, abort */
1754                 err = -EOPNOTSUPP;
1755                 goto out;
1756         }
1757
1758         exp = nf_ct_expect_alloc(ct);
1759         if (!exp) {
1760                 err = -ENOMEM;
1761                 goto out;
1762         }
1763
1764         exp->expectfn = NULL;
1765         exp->flags = 0;
1766         exp->master = ct;
1767         exp->helper = NULL;
1768         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1769         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1770         exp->mask.src.u.all = mask.src.u.all;
1771
1772         err = nf_ct_expect_related_report(exp, pid, report);
1773         nf_ct_expect_put(exp);
1774
1775 out:
1776         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1777         return err;
1778 }
1779
1780 static int
1781 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1782                      struct nlmsghdr *nlh, struct nlattr *cda[])
1783 {
1784         struct nf_conntrack_tuple tuple;
1785         struct nf_conntrack_expect *exp;
1786         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1787         u_int8_t u3 = nfmsg->nfgen_family;
1788         int err = 0;
1789
1790         if (!cda[CTA_EXPECT_TUPLE]
1791             || !cda[CTA_EXPECT_MASK]
1792             || !cda[CTA_EXPECT_MASTER])
1793                 return -EINVAL;
1794
1795         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1796         if (err < 0)
1797                 return err;
1798
1799         spin_lock_bh(&nf_conntrack_lock);
1800         exp = __nf_ct_expect_find(&init_net, &tuple);
1801
1802         if (!exp) {
1803                 spin_unlock_bh(&nf_conntrack_lock);
1804                 err = -ENOENT;
1805                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1806                         err = ctnetlink_create_expect(cda,
1807                                                       u3,
1808                                                       NETLINK_CB(skb).pid,
1809                                                       nlmsg_report(nlh));
1810                 }
1811                 return err;
1812         }
1813
1814         err = -EEXIST;
1815         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1816                 err = ctnetlink_change_expect(exp, cda);
1817         spin_unlock_bh(&nf_conntrack_lock);
1818
1819         return err;
1820 }
1821
1822 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1823 static struct notifier_block ctnl_notifier = {
1824         .notifier_call  = ctnetlink_conntrack_event,
1825 };
1826
1827 static struct notifier_block ctnl_notifier_exp = {
1828         .notifier_call  = ctnetlink_expect_event,
1829 };
1830 #endif
1831
1832 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1833         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1834                                             .attr_count = CTA_MAX,
1835                                             .policy = ct_nla_policy },
1836         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1837                                             .attr_count = CTA_MAX,
1838                                             .policy = ct_nla_policy },
1839         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1840                                             .attr_count = CTA_MAX,
1841                                             .policy = ct_nla_policy },
1842         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1843                                             .attr_count = CTA_MAX,
1844                                             .policy = ct_nla_policy },
1845 };
1846
1847 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1848         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1849                                             .attr_count = CTA_EXPECT_MAX,
1850                                             .policy = exp_nla_policy },
1851         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1852                                             .attr_count = CTA_EXPECT_MAX,
1853                                             .policy = exp_nla_policy },
1854         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1855                                             .attr_count = CTA_EXPECT_MAX,
1856                                             .policy = exp_nla_policy },
1857 };
1858
1859 static const struct nfnetlink_subsystem ctnl_subsys = {
1860         .name                           = "conntrack",
1861         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1862         .cb_count                       = IPCTNL_MSG_MAX,
1863         .cb                             = ctnl_cb,
1864 };
1865
1866 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1867         .name                           = "conntrack_expect",
1868         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1869         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1870         .cb                             = ctnl_exp_cb,
1871 };
1872
1873 MODULE_ALIAS("ip_conntrack_netlink");
1874 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1875 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1876
1877 static int __init ctnetlink_init(void)
1878 {
1879         int ret;
1880
1881         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1882         ret = nfnetlink_subsys_register(&ctnl_subsys);
1883         if (ret < 0) {
1884                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1885                 goto err_out;
1886         }
1887
1888         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1889         if (ret < 0) {
1890                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1891                 goto err_unreg_subsys;
1892         }
1893
1894 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1895         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1896         if (ret < 0) {
1897                 printk("ctnetlink_init: cannot register notifier.\n");
1898                 goto err_unreg_exp_subsys;
1899         }
1900
1901         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1902         if (ret < 0) {
1903                 printk("ctnetlink_init: cannot expect register notifier.\n");
1904                 goto err_unreg_notifier;
1905         }
1906 #endif
1907
1908         return 0;
1909
1910 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1911 err_unreg_notifier:
1912         nf_conntrack_unregister_notifier(&ctnl_notifier);
1913 err_unreg_exp_subsys:
1914         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1915 #endif
1916 err_unreg_subsys:
1917         nfnetlink_subsys_unregister(&ctnl_subsys);
1918 err_out:
1919         return ret;
1920 }
1921
1922 static void __exit ctnetlink_exit(void)
1923 {
1924         printk("ctnetlink: unregistering from nfnetlink.\n");
1925
1926 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1927         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1928         nf_conntrack_unregister_notifier(&ctnl_notifier);
1929 #endif
1930
1931         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1932         nfnetlink_subsys_unregister(&ctnl_subsys);
1933         return;
1934 }
1935
1936 module_init(ctnetlink_init);
1937 module_exit(ctnetlink_exit);