SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2007 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/timer.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/errno.h>
  25 #include <linux/netlink.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/notifier.h>
  29
  30 #include <linux/netfilter.h>
  31 #include <net/netlink.h>
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_core.h>
  34 #include <net/netfilter/nf_conntrack_expect.h>
  35 #include <net/netfilter/nf_conntrack_helper.h>
  36 #include <net/netfilter/nf_conntrack_l3proto.h>
  37 #include <net/netfilter/nf_conntrack_l4proto.h>
  38 #include <net/netfilter/nf_conntrack_tuple.h>
  39 #ifdef CONFIG_NF_NAT_NEEDED
  40 #include <net/netfilter/nf_nat_core.h>
  41 #include <net/netfilter/nf_nat_protocol.h>
  42 #endif
  43
  44 #include <linux/netfilter/nfnetlink.h>
  45 #include <linux/netfilter/nfnetlink_conntrack.h>
  46
  47 MODULE_LICENSE("GPL");
  48
  49 static char __initdata version[] = "0.93";
  50
  51 static inline int
  52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  53                             const struct nf_conntrack_tuple *tuple,
  54                             struct nf_conntrack_l4proto *l4proto)
  55 {
  56         int ret = 0;
  57         struct nlattr *nest_parms;
  58
  59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  60         if (!nest_parms)
  61                 goto nla_put_failure;
  62         NLA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
  63
  64         if (likely(l4proto->tuple_to_nlattr))
  65                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  66
  67         nla_nest_end(skb, nest_parms);
  68
  69         return ret;
  70
  71 nla_put_failure:
  72         return -1;
  73 }
  74
  75 static inline int
  76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  77                          const struct nf_conntrack_tuple *tuple,
  78                          struct nf_conntrack_l3proto *l3proto)
  79 {
  80         int ret = 0;
  81         struct nlattr *nest_parms;
  82
  83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  84         if (!nest_parms)
  85                 goto nla_put_failure;
  86
  87         if (likely(l3proto->tuple_to_nlattr))
  88                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  89
  90         nla_nest_end(skb, nest_parms);
  91
  92         return ret;
  93
  94 nla_put_failure:
  95         return -1;
  96 }
  97
  98 static inline int
  99 ctnetlink_dump_tuples(struct sk_buff *skb,
 100                       const struct nf_conntrack_tuple *tuple)
 101 {
 102         int ret;
 103         struct nf_conntrack_l3proto *l3proto;
 104         struct nf_conntrack_l4proto *l4proto;
 105
 106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 108         nf_ct_l3proto_put(l3proto);
 109
 110         if (unlikely(ret < 0))
 111                 return ret;
 112
 113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 115         nf_ct_l4proto_put(l4proto);
 116
 117         return ret;
 118 }
 119
 120 static inline int
 121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 122 {
 123         __be32 status = htonl((u_int32_t) ct->status);
 124         NLA_PUT(skb, CTA_STATUS, sizeof(status), &status);
 125         return 0;
 126
 127 nla_put_failure:
 128         return -1;
 129 }
 130
 131 static inline int
 132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 133 {
 134         long timeout_l = ct->timeout.expires - jiffies;
 135         __be32 timeout;
 136
 137         if (timeout_l < 0)
 138                 timeout = 0;
 139         else
 140                 timeout = htonl(timeout_l / HZ);
 141
 142         NLA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
 143         return 0;
 144
 145 nla_put_failure:
 146         return -1;
 147 }
 148
 149 static inline int
 150 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 151 {
 152         struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 153         struct nlattr *nest_proto;
 154         int ret;
 155
 156         if (!l4proto->to_nlattr) {
 157                 nf_ct_l4proto_put(l4proto);
 158                 return 0;
 159         }
 160
 161         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 162         if (!nest_proto)
 163                 goto nla_put_failure;
 164
 165         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 166
 167         nf_ct_l4proto_put(l4proto);
 168
 169         nla_nest_end(skb, nest_proto);
 170
 171         return ret;
 172
 173 nla_put_failure:
 174         nf_ct_l4proto_put(l4proto);
 175         return -1;
 176 }
 177
 178 static inline int
 179 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 180 {
 181         struct nlattr *nest_helper;
 182         const struct nf_conn_help *help = nfct_help(ct);
 183         struct nf_conntrack_helper *helper;
 184
 185         if (!help)
 186                 return 0;
 187
 188         rcu_read_lock();
 189         helper = rcu_dereference(help->helper);
 190         if (!helper)
 191                 goto out;
 192
 193         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 194         if (!nest_helper)
 195                 goto nla_put_failure;
 196         NLA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name);
 197
 198         if (helper->to_nlattr)
 199                 helper->to_nlattr(skb, ct);
 200
 201         nla_nest_end(skb, nest_helper);
 202 out:
 203         rcu_read_unlock();
 204         return 0;
 205
 206 nla_put_failure:
 207         rcu_read_unlock();
 208         return -1;
 209 }
 210
 211 #ifdef CONFIG_NF_CT_ACCT
 212 static inline int
 213 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 214                         enum ip_conntrack_dir dir)
 215 {
 216         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 217         struct nlattr *nest_count;
 218         __be32 tmp;
 219
 220         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 221         if (!nest_count)
 222                 goto nla_put_failure;
 223
 224         tmp = htonl(ct->counters[dir].packets);
 225         NLA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
 226
 227         tmp = htonl(ct->counters[dir].bytes);
 228         NLA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
 229
 230         nla_nest_end(skb, nest_count);
 231
 232         return 0;
 233
 234 nla_put_failure:
 235         return -1;
 236 }
 237 #else
 238 #define ctnetlink_dump_counters(a, b, c) (0)
 239 #endif
 240
 241 #ifdef CONFIG_NF_CONNTRACK_MARK
 242 static inline int
 243 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 244 {
 245         __be32 mark = htonl(ct->mark);
 246
 247         NLA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
 248         return 0;
 249
 250 nla_put_failure:
 251         return -1;
 252 }
 253 #else
 254 #define ctnetlink_dump_mark(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 inline int
 282 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 283 {
 284         __be32 tmp;
 285         struct nlattr *nest_parms;
 286
 287         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 288         if (!nest_parms)
 289                 goto nla_put_failure;
 290
 291         tmp = htonl(natseq->correction_pos);
 292         NLA_PUT(skb, CTA_NAT_SEQ_CORRECTION_POS, sizeof(tmp), &tmp);
 293         tmp = htonl(natseq->offset_before);
 294         NLA_PUT(skb, CTA_NAT_SEQ_OFFSET_BEFORE, sizeof(tmp), &tmp);
 295         tmp = htonl(natseq->offset_after);
 296         NLA_PUT(skb, CTA_NAT_SEQ_OFFSET_AFTER, sizeof(tmp), &tmp);
 297
 298         nla_nest_end(skb, nest_parms);
 299
 300         return 0;
 301
 302 nla_put_failure:
 303         return -1;
 304 }
 305
 306 static inline int
 307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 308 {
 309         struct nf_nat_seq *natseq;
 310         struct nf_conn_nat *nat = nfct_nat(ct);
 311
 312         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 313                 return 0;
 314
 315         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 316         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 317                 return -1;
 318
 319         natseq = &nat->seq[IP_CT_DIR_REPLY];
 320         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 321                 return -1;
 322
 323         return 0;
 324 }
 325 #else
 326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 327 #endif
 328
 329 static inline int
 330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 331 {
 332         __be32 id = htonl((unsigned long)ct);
 333         NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
 334         return 0;
 335
 336 nla_put_failure:
 337         return -1;
 338 }
 339
 340 static inline int
 341 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 342 {
 343         __be32 use = htonl(atomic_read(&ct->ct_general.use));
 344
 345         NLA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
 346         return 0;
 347
 348 nla_put_failure:
 349         return -1;
 350 }
 351
 352 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 353
 354 static int
 355 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 356                     int event, int nowait,
 357                     const struct nf_conn *ct)
 358 {
 359         struct nlmsghdr *nlh;
 360         struct nfgenmsg *nfmsg;
 361         struct nlattr *nest_parms;
 362         unsigned char *b = skb_tail_pointer(skb);
 363
 364         event |= NFNL_SUBSYS_CTNETLINK << 8;
 365         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 366         nfmsg  = NLMSG_DATA(nlh);
 367
 368         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 369         nfmsg->nfgen_family =
 370                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 371         nfmsg->version      = NFNETLINK_V0;
 372         nfmsg->res_id       = 0;
 373
 374         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 375         if (!nest_parms)
 376                 goto nla_put_failure;
 377         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 378                 goto nla_put_failure;
 379         nla_nest_end(skb, nest_parms);
 380
 381         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 382         if (!nest_parms)
 383                 goto nla_put_failure;
 384         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 385                 goto nla_put_failure;
 386         nla_nest_end(skb, nest_parms);
 387
 388         if (ctnetlink_dump_status(skb, ct) < 0 ||
 389             ctnetlink_dump_timeout(skb, ct) < 0 ||
 390             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 391             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 392             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 393             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 394             ctnetlink_dump_mark(skb, ct) < 0 ||
 395             ctnetlink_dump_id(skb, ct) < 0 ||
 396             ctnetlink_dump_use(skb, ct) < 0 ||
 397             ctnetlink_dump_master(skb, ct) < 0 ||
 398             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 399                 goto nla_put_failure;
 400
 401         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 402         return skb->len;
 403
 404 nlmsg_failure:
 405 nla_put_failure:
 406         nlmsg_trim(skb, b);
 407         return -1;
 408 }
 409
 410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 411 static int ctnetlink_conntrack_event(struct notifier_block *this,
 412                                      unsigned long events, void *ptr)
 413 {
 414         struct nlmsghdr *nlh;
 415         struct nfgenmsg *nfmsg;
 416         struct nlattr *nest_parms;
 417         struct nf_conn *ct = (struct nf_conn *)ptr;
 418         struct sk_buff *skb;
 419         unsigned int type;
 420         sk_buff_data_t b;
 421         unsigned int flags = 0, group;
 422
 423         /* ignore our fake conntrack entry */
 424         if (ct == &nf_conntrack_untracked)
 425                 return NOTIFY_DONE;
 426
 427         if (events & IPCT_DESTROY) {
 428                 type = IPCTNL_MSG_CT_DELETE;
 429                 group = NFNLGRP_CONNTRACK_DESTROY;
 430         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 431                 type = IPCTNL_MSG_CT_NEW;
 432                 flags = NLM_F_CREATE|NLM_F_EXCL;
 433                 group = NFNLGRP_CONNTRACK_NEW;
 434         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 435                 type = IPCTNL_MSG_CT_NEW;
 436                 group = NFNLGRP_CONNTRACK_UPDATE;
 437         } else
 438                 return NOTIFY_DONE;
 439
 440         if (!nfnetlink_has_listeners(group))
 441                 return NOTIFY_DONE;
 442
 443         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 444         if (!skb)
 445                 return NOTIFY_DONE;
 446
 447         b = skb->tail;
 448
 449         type |= NFNL_SUBSYS_CTNETLINK << 8;
 450         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 451         nfmsg = NLMSG_DATA(nlh);
 452
 453         nlh->nlmsg_flags    = flags;
 454         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 455         nfmsg->version  = NFNETLINK_V0;
 456         nfmsg->res_id   = 0;
 457
 458         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 459         if (!nest_parms)
 460                 goto nla_put_failure;
 461         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 462                 goto nla_put_failure;
 463         nla_nest_end(skb, nest_parms);
 464
 465         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 466         if (!nest_parms)
 467                 goto nla_put_failure;
 468         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 469                 goto nla_put_failure;
 470         nla_nest_end(skb, nest_parms);
 471
 472         if (events & IPCT_DESTROY) {
 473                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 474                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 475                         goto nla_put_failure;
 476         } else {
 477                 if (ctnetlink_dump_status(skb, ct) < 0)
 478                         goto nla_put_failure;
 479
 480                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 481                         goto nla_put_failure;
 482
 483                 if (events & IPCT_PROTOINFO
 484                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 485                         goto nla_put_failure;
 486
 487                 if ((events & IPCT_HELPER || nfct_help(ct))
 488                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 489                         goto nla_put_failure;
 490
 491 #ifdef CONFIG_NF_CONNTRACK_MARK
 492                 if ((events & IPCT_MARK || ct->mark)
 493                     && ctnetlink_dump_mark(skb, ct) < 0)
 494                         goto nla_put_failure;
 495 #endif
 496
 497                 if (events & IPCT_COUNTER_FILLING &&
 498                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 499                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 500                         goto nla_put_failure;
 501
 502                 if (events & IPCT_RELATED &&
 503                     ctnetlink_dump_master(skb, ct) < 0)
 504                         goto nla_put_failure;
 505
 506                 if (events & IPCT_NATSEQADJ &&
 507                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 508                         goto nla_put_failure;
 509         }
 510
 511         nlh->nlmsg_len = skb->tail - b;
 512         nfnetlink_send(skb, 0, group, 0);
 513         return NOTIFY_DONE;
 514
 515 nlmsg_failure:
 516 nla_put_failure:
 517         kfree_skb(skb);
 518         return NOTIFY_DONE;
 519 }
 520 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 521
 522 static int ctnetlink_done(struct netlink_callback *cb)
 523 {
 524         if (cb->args[1])
 525                 nf_ct_put((struct nf_conn *)cb->args[1]);
 526         return 0;
 527 }
 528
 529 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
 530
 531 static int
 532 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 533 {
 534         struct nf_conn *ct, *last;
 535         struct nf_conntrack_tuple_hash *h;
 536         struct hlist_node *n;
 537         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 538         u_int8_t l3proto = nfmsg->nfgen_family;
 539
 540         read_lock_bh(&nf_conntrack_lock);
 541         last = (struct nf_conn *)cb->args[1];
 542         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 543 restart:
 544                 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
 545                                      hnode) {
 546                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 547                                 continue;
 548                         ct = nf_ct_tuplehash_to_ctrack(h);
 549                         /* Dump entries of a given L3 protocol number.
 550                          * If it is not specified, ie. l3proto == 0,
 551                          * then dump everything. */
 552                         if (l3proto && L3PROTO(ct) != l3proto)
 553                                 continue;
 554                         if (cb->args[1]) {
 555                                 if (ct != last)
 556                                         continue;
 557                                 cb->args[1] = 0;
 558                         }
 559                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 560                                                 cb->nlh->nlmsg_seq,
 561                                                 IPCTNL_MSG_CT_NEW,
 562                                                 1, ct) < 0) {
 563                                 nf_conntrack_get(&ct->ct_general);
 564                                 cb->args[1] = (unsigned long)ct;
 565                                 goto out;
 566                         }
 567 #ifdef CONFIG_NF_CT_ACCT
 568                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 569                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 570                                 memset(&ct->counters, 0, sizeof(ct->counters));
 571 #endif
 572                 }
 573                 if (cb->args[1]) {
 574                         cb->args[1] = 0;
 575                         goto restart;
 576                 }
 577         }
 578 out:
 579         read_unlock_bh(&nf_conntrack_lock);
 580         if (last)
 581                 nf_ct_put(last);
 582
 583         return skb->len;
 584 }
 585
 586 static inline int
 587 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 588 {
 589         struct nlattr *tb[CTA_IP_MAX+1];
 590         struct nf_conntrack_l3proto *l3proto;
 591         int ret = 0;
 592
 593         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 594
 595         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 596
 597         if (likely(l3proto->nlattr_to_tuple)) {
 598                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 599                                           l3proto->nla_policy);
 600                 if (ret == 0)
 601                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 602         }
 603
 604         nf_ct_l3proto_put(l3proto);
 605
 606         return ret;
 607 }
 608
 609 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 610         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 611 };
 612
 613 static inline int
 614 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 615                             struct nf_conntrack_tuple *tuple)
 616 {
 617         struct nlattr *tb[CTA_PROTO_MAX+1];
 618         struct nf_conntrack_l4proto *l4proto;
 619         int ret = 0;
 620
 621         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 622         if (ret < 0)
 623                 return ret;
 624
 625         if (!tb[CTA_PROTO_NUM])
 626                 return -EINVAL;
 627         tuple->dst.protonum = *(u_int8_t *)nla_data(tb[CTA_PROTO_NUM]);
 628
 629         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 630
 631         if (likely(l4proto->nlattr_to_tuple)) {
 632                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 633                                           l4proto->nla_policy);
 634                 if (ret == 0)
 635                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 636         }
 637
 638         nf_ct_l4proto_put(l4proto);
 639
 640         return ret;
 641 }
 642
 643 static inline int
 644 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 645                       enum ctattr_tuple type, u_int8_t l3num)
 646 {
 647         struct nlattr *tb[CTA_TUPLE_MAX+1];
 648         int err;
 649
 650         memset(tuple, 0, sizeof(*tuple));
 651
 652         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 653
 654         if (!tb[CTA_TUPLE_IP])
 655                 return -EINVAL;
 656
 657         tuple->src.l3num = l3num;
 658
 659         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 660         if (err < 0)
 661                 return err;
 662
 663         if (!tb[CTA_TUPLE_PROTO])
 664                 return -EINVAL;
 665
 666         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 667         if (err < 0)
 668                 return err;
 669
 670         /* orig and expect tuples get DIR_ORIGINAL */
 671         if (type == CTA_TUPLE_REPLY)
 672                 tuple->dst.dir = IP_CT_DIR_REPLY;
 673         else
 674                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 675
 676         return 0;
 677 }
 678
 679 #ifdef CONFIG_NF_NAT_NEEDED
 680 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
 681         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
 682         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
 683 };
 684
 685 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 686                                      const struct nf_conn *ct,
 687                                      struct nf_nat_range *range)
 688 {
 689         struct nlattr *tb[CTA_PROTONAT_MAX+1];
 690         struct nf_nat_protocol *npt;
 691         int err;
 692
 693         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
 694         if (err < 0)
 695                 return err;
 696
 697         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 698
 699         if (!npt->nlattr_to_range) {
 700                 nf_nat_proto_put(npt);
 701                 return 0;
 702         }
 703
 704         /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
 705         if (npt->nlattr_to_range(tb, range) > 0)
 706                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
 707
 708         nf_nat_proto_put(npt);
 709
 710         return 0;
 711 }
 712
 713 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
 714         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
 715         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
 716 };
 717
 718 static inline int
 719 nfnetlink_parse_nat(struct nlattr *nat,
 720                     const struct nf_conn *ct, struct nf_nat_range *range)
 721 {
 722         struct nlattr *tb[CTA_NAT_MAX+1];
 723         int err;
 724
 725         memset(range, 0, sizeof(*range));
 726
 727         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
 728         if (err < 0)
 729                 return err;
 730
 731         if (tb[CTA_NAT_MINIP])
 732                 range->min_ip = *(__be32 *)nla_data(tb[CTA_NAT_MINIP]);
 733
 734         if (!tb[CTA_NAT_MAXIP])
 735                 range->max_ip = range->min_ip;
 736         else
 737                 range->max_ip = *(__be32 *)nla_data(tb[CTA_NAT_MAXIP]);
 738
 739         if (range->min_ip)
 740                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 741
 742         if (!tb[CTA_NAT_PROTO])
 743                 return 0;
 744
 745         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
 746         if (err < 0)
 747                 return err;
 748
 749         return 0;
 750 }
 751 #endif
 752
 753 static inline int
 754 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 755 {
 756         struct nlattr *tb[CTA_HELP_MAX+1];
 757
 758         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 759
 760         if (!tb[CTA_HELP_NAME])
 761                 return -EINVAL;
 762
 763         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 764
 765         return 0;
 766 }
 767
 768 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 769         [CTA_STATUS]            = { .type = NLA_U32 },
 770         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 771         [CTA_MARK]              = { .type = NLA_U32 },
 772         [CTA_USE]               = { .type = NLA_U32 },
 773         [CTA_ID]                = { .type = NLA_U32 },
 774 };
 775
 776 static int
 777 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 778                         struct nlmsghdr *nlh, struct nlattr *cda[])
 779 {
 780         struct nf_conntrack_tuple_hash *h;
 781         struct nf_conntrack_tuple tuple;
 782         struct nf_conn *ct;
 783         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 784         u_int8_t u3 = nfmsg->nfgen_family;
 785         int err = 0;
 786
 787         if (cda[CTA_TUPLE_ORIG])
 788                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 789         else if (cda[CTA_TUPLE_REPLY])
 790                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 791         else {
 792                 /* Flush the whole table */
 793                 nf_conntrack_flush();
 794                 return 0;
 795         }
 796
 797         if (err < 0)
 798                 return err;
 799
 800         h = nf_conntrack_find_get(&tuple);
 801         if (!h)
 802                 return -ENOENT;
 803
 804         ct = nf_ct_tuplehash_to_ctrack(h);
 805
 806         if (cda[CTA_ID]) {
 807                 u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
 808                 if (id != (u32)(unsigned long)ct) {
 809                         nf_ct_put(ct);
 810                         return -ENOENT;
 811                 }
 812         }
 813         if (del_timer(&ct->timeout))
 814                 ct->timeout.function((unsigned long)ct);
 815
 816         nf_ct_put(ct);
 817
 818         return 0;
 819 }
 820
 821 static int
 822 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 823                         struct nlmsghdr *nlh, struct nlattr *cda[])
 824 {
 825         struct nf_conntrack_tuple_hash *h;
 826         struct nf_conntrack_tuple tuple;
 827         struct nf_conn *ct;
 828         struct sk_buff *skb2 = NULL;
 829         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 830         u_int8_t u3 = nfmsg->nfgen_family;
 831         int err = 0;
 832
 833         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 834 #ifndef CONFIG_NF_CT_ACCT
 835                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 836                         return -ENOTSUPP;
 837 #endif
 838                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 839                                           ctnetlink_done);
 840         }
 841
 842         if (cda[CTA_TUPLE_ORIG])
 843                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 844         else if (cda[CTA_TUPLE_REPLY])
 845                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 846         else
 847                 return -EINVAL;
 848
 849         if (err < 0)
 850                 return err;
 851
 852         h = nf_conntrack_find_get(&tuple);
 853         if (!h)
 854                 return -ENOENT;
 855
 856         ct = nf_ct_tuplehash_to_ctrack(h);
 857
 858         err = -ENOMEM;
 859         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 860         if (!skb2) {
 861                 nf_ct_put(ct);
 862                 return -ENOMEM;
 863         }
 864
 865         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 866                                   IPCTNL_MSG_CT_NEW, 1, ct);
 867         nf_ct_put(ct);
 868         if (err <= 0)
 869                 goto free;
 870
 871         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 872         if (err < 0)
 873                 goto out;
 874
 875         return 0;
 876
 877 free:
 878         kfree_skb(skb2);
 879 out:
 880         return err;
 881 }
 882
 883 static inline int
 884 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 885 {
 886         unsigned long d;
 887         unsigned int status = ntohl(*(__be32 *)nla_data(cda[CTA_STATUS]));
 888         d = ct->status ^ status;
 889
 890         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 891                 /* unchangeable */
 892                 return -EINVAL;
 893
 894         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 895                 /* SEEN_REPLY bit can only be set */
 896                 return -EINVAL;
 897
 898
 899         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 900                 /* ASSURED bit can only be set */
 901                 return -EINVAL;
 902
 903         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 904 #ifndef CONFIG_NF_NAT_NEEDED
 905                 return -EINVAL;
 906 #else
 907                 struct nf_nat_range range;
 908
 909                 if (cda[CTA_NAT_DST]) {
 910                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 911                                                 &range) < 0)
 912                                 return -EINVAL;
 913                         if (nf_nat_initialized(ct,
 914                                                HOOK2MANIP(NF_INET_PRE_ROUTING)))
 915                                 return -EEXIST;
 916                         nf_nat_setup_info(ct, &range, NF_INET_PRE_ROUTING);
 917                 }
 918                 if (cda[CTA_NAT_SRC]) {
 919                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 920                                                 &range) < 0)
 921                                 return -EINVAL;
 922                         if (nf_nat_initialized(ct,
 923                                                HOOK2MANIP(NF_INET_POST_ROUTING)))
 924                                 return -EEXIST;
 925                         nf_nat_setup_info(ct, &range, NF_INET_POST_ROUTING);
 926                 }
 927 #endif
 928         }
 929
 930         /* Be careful here, modifying NAT bits can screw up things,
 931          * so don't let users modify them directly if they don't pass
 932          * nf_nat_range. */
 933         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 934         return 0;
 935 }
 936
 937
 938 static inline int
 939 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 940 {
 941         struct nf_conntrack_helper *helper;
 942         struct nf_conn_help *help = nfct_help(ct);
 943         char *helpname;
 944         int err;
 945
 946         /* don't change helper of sibling connections */
 947         if (ct->master)
 948                 return -EINVAL;
 949
 950         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 951         if (err < 0)
 952                 return err;
 953
 954         if (!strcmp(helpname, "")) {
 955                 if (help && help->helper) {
 956                         /* we had a helper before ... */
 957                         nf_ct_remove_expectations(ct);
 958                         rcu_assign_pointer(help->helper, NULL);
 959                 }
 960
 961                 return 0;
 962         }
 963
 964         helper = __nf_conntrack_helper_find_byname(helpname);
 965         if (helper == NULL)
 966                 return -EINVAL;
 967
 968         if (help) {
 969                 if (help->helper == helper)
 970                         return 0;
 971                 if (help->helper)
 972                         return -EBUSY;
 973                 /* need to zero data of old helper */
 974                 memset(&help->help, 0, sizeof(help->help));
 975         } else {
 976                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 977                 if (help == NULL)
 978                         return -ENOMEM;
 979         }
 980
 981         rcu_assign_pointer(help->helper, helper);
 982
 983         return 0;
 984 }
 985
 986 static inline int
 987 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 988 {
 989         u_int32_t timeout = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
 990
 991         if (!del_timer(&ct->timeout))
 992                 return -ETIME;
 993
 994         ct->timeout.expires = jiffies + timeout * HZ;
 995         add_timer(&ct->timeout);
 996
 997         return 0;
 998 }
 999
1000 static inline int
1001 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1002 {
1003         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1004         struct nf_conntrack_l4proto *l4proto;
1005         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
1006         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
1007         int err = 0;
1008
1009         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1010
1011         l4proto = nf_ct_l4proto_find_get(l3num, npt);
1012
1013         if (l4proto->from_nlattr)
1014                 err = l4proto->from_nlattr(tb, ct);
1015         nf_ct_l4proto_put(l4proto);
1016
1017         return err;
1018 }
1019
1020 #ifdef CONFIG_NF_NAT_NEEDED
1021 static inline int
1022 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1023 {
1024         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1025
1026         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1027
1028         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1029                 return -EINVAL;
1030
1031         natseq->correction_pos =
1032                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1033
1034         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1035                 return -EINVAL;
1036
1037         natseq->offset_before =
1038                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1039
1040         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1041                 return -EINVAL;
1042
1043         natseq->offset_after =
1044                 ntohl(*(__be32 *)nla_data(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1045
1046         return 0;
1047 }
1048
1049 static int
1050 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1051 {
1052         int ret = 0;
1053         struct nf_conn_nat *nat = nfct_nat(ct);
1054
1055         if (!nat)
1056                 return 0;
1057
1058         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1059                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1060                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1061                 if (ret < 0)
1062                         return ret;
1063
1064                 ct->status |= IPS_SEQ_ADJUST;
1065         }
1066
1067         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1068                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1069                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1070                 if (ret < 0)
1071                         return ret;
1072
1073                 ct->status |= IPS_SEQ_ADJUST;
1074         }
1075
1076         return 0;
1077 }
1078 #endif
1079
1080 static int
1081 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1082 {
1083         int err;
1084
1085         if (cda[CTA_HELP]) {
1086                 err = ctnetlink_change_helper(ct, cda);
1087                 if (err < 0)
1088                         return err;
1089         }
1090
1091         if (cda[CTA_TIMEOUT]) {
1092                 err = ctnetlink_change_timeout(ct, cda);
1093                 if (err < 0)
1094                         return err;
1095         }
1096
1097         if (cda[CTA_STATUS]) {
1098                 err = ctnetlink_change_status(ct, cda);
1099                 if (err < 0)
1100                         return err;
1101         }
1102
1103         if (cda[CTA_PROTOINFO]) {
1104                 err = ctnetlink_change_protoinfo(ct, cda);
1105                 if (err < 0)
1106                         return err;
1107         }
1108
1109 #if defined(CONFIG_NF_CONNTRACK_MARK)
1110         if (cda[CTA_MARK])
1111                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1112 #endif
1113
1114 #ifdef CONFIG_NF_NAT_NEEDED
1115         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1116                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1117                 if (err < 0)
1118                         return err;
1119         }
1120 #endif
1121
1122         return 0;
1123 }
1124
1125 static int
1126 ctnetlink_create_conntrack(struct nlattr *cda[],
1127                            struct nf_conntrack_tuple *otuple,
1128                            struct nf_conntrack_tuple *rtuple,
1129                            struct nf_conn *master_ct)
1130 {
1131         struct nf_conn *ct;
1132         int err = -EINVAL;
1133         struct nf_conn_help *help;
1134         struct nf_conntrack_helper *helper;
1135
1136         ct = nf_conntrack_alloc(otuple, rtuple);
1137         if (ct == NULL || IS_ERR(ct))
1138                 return -ENOMEM;
1139
1140         if (!cda[CTA_TIMEOUT])
1141                 goto err;
1142         ct->timeout.expires = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
1143
1144         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1145         ct->status |= IPS_CONFIRMED;
1146
1147         if (cda[CTA_STATUS]) {
1148                 err = ctnetlink_change_status(ct, cda);
1149                 if (err < 0)
1150                         goto err;
1151         }
1152
1153         if (cda[CTA_PROTOINFO]) {
1154                 err = ctnetlink_change_protoinfo(ct, cda);
1155                 if (err < 0)
1156                         goto err;
1157         }
1158
1159 #if defined(CONFIG_NF_CONNTRACK_MARK)
1160         if (cda[CTA_MARK])
1161                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1162 #endif
1163
1164         helper = nf_ct_helper_find_get(rtuple);
1165         if (helper) {
1166                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1167                 if (help == NULL) {
1168                         nf_ct_helper_put(helper);
1169                         err = -ENOMEM;
1170                         goto err;
1171                 }
1172                 /* not in hash table yet so not strictly necessary */
1173                 rcu_assign_pointer(help->helper, helper);
1174         }
1175
1176         /* setup master conntrack: this is a confirmed expectation */
1177         if (master_ct) {
1178                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1179                 ct->master = master_ct;
1180         }
1181
1182         add_timer(&ct->timeout);
1183         nf_conntrack_hash_insert(ct);
1184
1185         if (helper)
1186                 nf_ct_helper_put(helper);
1187
1188         return 0;
1189
1190 err:
1191         nf_conntrack_free(ct);
1192         return err;
1193 }
1194
1195 static int
1196 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1197                         struct nlmsghdr *nlh, struct nlattr *cda[])
1198 {
1199         struct nf_conntrack_tuple otuple, rtuple;
1200         struct nf_conntrack_tuple_hash *h = NULL;
1201         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1202         u_int8_t u3 = nfmsg->nfgen_family;
1203         int err = 0;
1204
1205         if (cda[CTA_TUPLE_ORIG]) {
1206                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1207                 if (err < 0)
1208                         return err;
1209         }
1210
1211         if (cda[CTA_TUPLE_REPLY]) {
1212                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1213                 if (err < 0)
1214                         return err;
1215         }
1216
1217         write_lock_bh(&nf_conntrack_lock);
1218         if (cda[CTA_TUPLE_ORIG])
1219                 h = __nf_conntrack_find(&otuple, NULL);
1220         else if (cda[CTA_TUPLE_REPLY])
1221                 h = __nf_conntrack_find(&rtuple, NULL);
1222
1223         if (h == NULL) {
1224                 struct nf_conntrack_tuple master;
1225                 struct nf_conntrack_tuple_hash *master_h = NULL;
1226                 struct nf_conn *master_ct = NULL;
1227
1228                 if (cda[CTA_TUPLE_MASTER]) {
1229                         err = ctnetlink_parse_tuple(cda,
1230                                                     &master,
1231                                                     CTA_TUPLE_MASTER,
1232                                                     u3);
1233                         if (err < 0)
1234                                 return err;
1235
1236                         master_h = __nf_conntrack_find(&master, NULL);
1237                         if (master_h == NULL) {
1238                                 err = -ENOENT;
1239                                 goto out_unlock;
1240                         }
1241                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1242                         atomic_inc(&master_ct->ct_general.use);
1243                 }
1244
1245                 write_unlock_bh(&nf_conntrack_lock);
1246                 err = -ENOENT;
1247                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1248                         err = ctnetlink_create_conntrack(cda,
1249                                                          &otuple,
1250                                                          &rtuple,
1251                                                          master_ct);
1252                 if (err < 0 && master_ct)
1253                         nf_ct_put(master_ct);
1254
1255                 return err;
1256         }
1257         /* implicit 'else' */
1258
1259         /* We manipulate the conntrack inside the global conntrack table lock,
1260          * so there's no need to increase the refcount */
1261         err = -EEXIST;
1262         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1263                 /* we only allow nat config for new conntracks */
1264                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1265                         err = -EINVAL;
1266                         goto out_unlock;
1267                 }
1268                 /* can't link an existing conntrack to a master */
1269                 if (cda[CTA_TUPLE_MASTER]) {
1270                         err = -EINVAL;
1271                         goto out_unlock;
1272                 }
1273                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1274                                                  cda);
1275         }
1276
1277 out_unlock:
1278         write_unlock_bh(&nf_conntrack_lock);
1279         return err;
1280 }
1281
1282 /***********************************************************************
1283  * EXPECT
1284  ***********************************************************************/
1285
1286 static inline int
1287 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1288                          const struct nf_conntrack_tuple *tuple,
1289                          enum ctattr_expect type)
1290 {
1291         struct nlattr *nest_parms;
1292
1293         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1294         if (!nest_parms)
1295                 goto nla_put_failure;
1296         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1297                 goto nla_put_failure;
1298         nla_nest_end(skb, nest_parms);
1299
1300         return 0;
1301
1302 nla_put_failure:
1303         return -1;
1304 }
1305
1306 static inline int
1307 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1308                         const struct nf_conntrack_tuple *tuple,
1309                         const struct nf_conntrack_tuple_mask *mask)
1310 {
1311         int ret;
1312         struct nf_conntrack_l3proto *l3proto;
1313         struct nf_conntrack_l4proto *l4proto;
1314         struct nf_conntrack_tuple m;
1315         struct nlattr *nest_parms;
1316
1317         memset(&m, 0xFF, sizeof(m));
1318         m.src.u.all = mask->src.u.all;
1319         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1320
1321         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1322         if (!nest_parms)
1323                 goto nla_put_failure;
1324
1325         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1326         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1327         nf_ct_l3proto_put(l3proto);
1328
1329         if (unlikely(ret < 0))
1330                 goto nla_put_failure;
1331
1332         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1333         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1334         nf_ct_l4proto_put(l4proto);
1335         if (unlikely(ret < 0))
1336                 goto nla_put_failure;
1337
1338         nla_nest_end(skb, nest_parms);
1339
1340         return 0;
1341
1342 nla_put_failure:
1343         return -1;
1344 }
1345
1346 static inline int
1347 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1348                           const struct nf_conntrack_expect *exp)
1349 {
1350         struct nf_conn *master = exp->master;
1351         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1352         __be32 id = htonl((unsigned long)exp);
1353
1354         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1355                 goto nla_put_failure;
1356         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1357                 goto nla_put_failure;
1358         if (ctnetlink_exp_dump_tuple(skb,
1359                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1360                                  CTA_EXPECT_MASTER) < 0)
1361                 goto nla_put_failure;
1362
1363         NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1364         NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1365
1366         return 0;
1367
1368 nla_put_failure:
1369         return -1;
1370 }
1371
1372 static int
1373 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1374                     int event,
1375                     int nowait,
1376                     const struct nf_conntrack_expect *exp)
1377 {
1378         struct nlmsghdr *nlh;
1379         struct nfgenmsg *nfmsg;
1380         unsigned char *b = skb_tail_pointer(skb);
1381
1382         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1383         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1384         nfmsg  = NLMSG_DATA(nlh);
1385
1386         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1387         nfmsg->nfgen_family = exp->tuple.src.l3num;
1388         nfmsg->version      = NFNETLINK_V0;
1389         nfmsg->res_id       = 0;
1390
1391         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1392                 goto nla_put_failure;
1393
1394         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1395         return skb->len;
1396
1397 nlmsg_failure:
1398 nla_put_failure:
1399         nlmsg_trim(skb, b);
1400         return -1;
1401 }
1402
1403 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1404 static int ctnetlink_expect_event(struct notifier_block *this,
1405                                   unsigned long events, void *ptr)
1406 {
1407         struct nlmsghdr *nlh;
1408         struct nfgenmsg *nfmsg;
1409         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1410         struct sk_buff *skb;
1411         unsigned int type;
1412         sk_buff_data_t b;
1413         int flags = 0;
1414
1415         if (events & IPEXP_NEW) {
1416                 type = IPCTNL_MSG_EXP_NEW;
1417                 flags = NLM_F_CREATE|NLM_F_EXCL;
1418         } else
1419                 return NOTIFY_DONE;
1420
1421         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1422                 return NOTIFY_DONE;
1423
1424         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1425         if (!skb)
1426                 return NOTIFY_DONE;
1427
1428         b = skb->tail;
1429
1430         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1431         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1432         nfmsg = NLMSG_DATA(nlh);
1433
1434         nlh->nlmsg_flags    = flags;
1435         nfmsg->nfgen_family = exp->tuple.src.l3num;
1436         nfmsg->version      = NFNETLINK_V0;
1437         nfmsg->res_id       = 0;
1438
1439         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1440                 goto nla_put_failure;
1441
1442         nlh->nlmsg_len = skb->tail - b;
1443         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1444         return NOTIFY_DONE;
1445
1446 nlmsg_failure:
1447 nla_put_failure:
1448         kfree_skb(skb);
1449         return NOTIFY_DONE;
1450 }
1451 #endif
1452 static int ctnetlink_exp_done(struct netlink_callback *cb)
1453 {
1454         if (cb->args[1])
1455                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1456         return 0;
1457 }
1458
1459 static int
1460 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1461 {
1462         struct nf_conntrack_expect *exp, *last;
1463         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1464         struct hlist_node *n;
1465         u_int8_t l3proto = nfmsg->nfgen_family;
1466
1467         read_lock_bh(&nf_conntrack_lock);
1468         last = (struct nf_conntrack_expect *)cb->args[1];
1469         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1470 restart:
1471                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1472                                      hnode) {
1473                         if (l3proto && exp->tuple.src.l3num != l3proto)
1474                                 continue;
1475                         if (cb->args[1]) {
1476                                 if (exp != last)
1477                                         continue;
1478                                 cb->args[1] = 0;
1479                         }
1480                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1481                                                     cb->nlh->nlmsg_seq,
1482                                                     IPCTNL_MSG_EXP_NEW,
1483                                                     1, exp) < 0) {
1484                                 atomic_inc(&exp->use);
1485                                 cb->args[1] = (unsigned long)exp;
1486                                 goto out;
1487                         }
1488                 }
1489                 if (cb->args[1]) {
1490                         cb->args[1] = 0;
1491                         goto restart;
1492                 }
1493         }
1494 out:
1495         read_unlock_bh(&nf_conntrack_lock);
1496         if (last)
1497                 nf_ct_expect_put(last);
1498
1499         return skb->len;
1500 }
1501
1502 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1503         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1504         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1505 };
1506
1507 static int
1508 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1509                      struct nlmsghdr *nlh, struct nlattr *cda[])
1510 {
1511         struct nf_conntrack_tuple tuple;
1512         struct nf_conntrack_expect *exp;
1513         struct sk_buff *skb2;
1514         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1515         u_int8_t u3 = nfmsg->nfgen_family;
1516         int err = 0;
1517
1518         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1519                 return netlink_dump_start(ctnl, skb, nlh,
1520                                           ctnetlink_exp_dump_table,
1521                                           ctnetlink_exp_done);
1522         }
1523
1524         if (cda[CTA_EXPECT_MASTER])
1525                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1526         else
1527                 return -EINVAL;
1528
1529         if (err < 0)
1530                 return err;
1531
1532         exp = nf_ct_expect_find_get(&tuple);
1533         if (!exp)
1534                 return -ENOENT;
1535
1536         if (cda[CTA_EXPECT_ID]) {
1537                 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1538                 if (ntohl(id) != (u32)(unsigned long)exp) {
1539                         nf_ct_expect_put(exp);
1540                         return -ENOENT;
1541                 }
1542         }
1543
1544         err = -ENOMEM;
1545         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1546         if (!skb2)
1547                 goto out;
1548
1549         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1550                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1551                                       1, exp);
1552         if (err <= 0)
1553                 goto free;
1554
1555         nf_ct_expect_put(exp);
1556
1557         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1558
1559 free:
1560         kfree_skb(skb2);
1561 out:
1562         nf_ct_expect_put(exp);
1563         return err;
1564 }
1565
1566 static int
1567 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1568                      struct nlmsghdr *nlh, struct nlattr *cda[])
1569 {
1570         struct nf_conntrack_expect *exp;
1571         struct nf_conntrack_tuple tuple;
1572         struct nf_conntrack_helper *h;
1573         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1574         struct hlist_node *n, *next;
1575         u_int8_t u3 = nfmsg->nfgen_family;
1576         unsigned int i;
1577         int err;
1578
1579         if (cda[CTA_EXPECT_TUPLE]) {
1580                 /* delete a single expect by tuple */
1581                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1582                 if (err < 0)
1583                         return err;
1584
1585                 /* bump usage count to 2 */
1586                 exp = nf_ct_expect_find_get(&tuple);
1587                 if (!exp)
1588                         return -ENOENT;
1589
1590                 if (cda[CTA_EXPECT_ID]) {
1591                         __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1592                         if (ntohl(id) != (u32)(unsigned long)exp) {
1593                                 nf_ct_expect_put(exp);
1594                                 return -ENOENT;
1595                         }
1596                 }
1597
1598                 /* after list removal, usage count == 1 */
1599                 nf_ct_unexpect_related(exp);
1600                 /* have to put what we 'get' above.
1601                  * after this line usage count == 0 */
1602                 nf_ct_expect_put(exp);
1603         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1604                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1605                 struct nf_conn_help *m_help;
1606
1607                 /* delete all expectations for this helper */
1608                 write_lock_bh(&nf_conntrack_lock);
1609                 h = __nf_conntrack_helper_find_byname(name);
1610                 if (!h) {
1611                         write_unlock_bh(&nf_conntrack_lock);
1612                         return -EINVAL;
1613                 }
1614                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1615                         hlist_for_each_entry_safe(exp, n, next,
1616                                                   &nf_ct_expect_hash[i],
1617                                                   hnode) {
1618                                 m_help = nfct_help(exp->master);
1619                                 if (m_help->helper == h
1620                                     && del_timer(&exp->timeout)) {
1621                                         nf_ct_unlink_expect(exp);
1622                                         nf_ct_expect_put(exp);
1623                                 }
1624                         }
1625                 }
1626                 write_unlock_bh(&nf_conntrack_lock);
1627         } else {
1628                 /* This basically means we have to flush everything*/
1629                 write_lock_bh(&nf_conntrack_lock);
1630                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1631                         hlist_for_each_entry_safe(exp, n, next,
1632                                                   &nf_ct_expect_hash[i],
1633                                                   hnode) {
1634                                 if (del_timer(&exp->timeout)) {
1635                                         nf_ct_unlink_expect(exp);
1636                                         nf_ct_expect_put(exp);
1637                                 }
1638                         }
1639                 }
1640                 write_unlock_bh(&nf_conntrack_lock);
1641         }
1642
1643         return 0;
1644 }
1645 static int
1646 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1647 {
1648         return -EOPNOTSUPP;
1649 }
1650
1651 static int
1652 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1653 {
1654         struct nf_conntrack_tuple tuple, mask, master_tuple;
1655         struct nf_conntrack_tuple_hash *h = NULL;
1656         struct nf_conntrack_expect *exp;
1657         struct nf_conn *ct;
1658         struct nf_conn_help *help;
1659         int err = 0;
1660
1661         /* caller guarantees that those three CTA_EXPECT_* exist */
1662         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1663         if (err < 0)
1664                 return err;
1665         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1666         if (err < 0)
1667                 return err;
1668         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1669         if (err < 0)
1670                 return err;
1671
1672         /* Look for master conntrack of this expectation */
1673         h = nf_conntrack_find_get(&master_tuple);
1674         if (!h)
1675                 return -ENOENT;
1676         ct = nf_ct_tuplehash_to_ctrack(h);
1677         help = nfct_help(ct);
1678
1679         if (!help || !help->helper) {
1680                 /* such conntrack hasn't got any helper, abort */
1681                 err = -EINVAL;
1682                 goto out;
1683         }
1684
1685         exp = nf_ct_expect_alloc(ct);
1686         if (!exp) {
1687                 err = -ENOMEM;
1688                 goto out;
1689         }
1690
1691         exp->expectfn = NULL;
1692         exp->flags = 0;
1693         exp->master = ct;
1694         exp->helper = NULL;
1695         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1696         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1697         exp->mask.src.u.all = mask.src.u.all;
1698
1699         err = nf_ct_expect_related(exp);
1700         nf_ct_expect_put(exp);
1701
1702 out:
1703         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1704         return err;
1705 }
1706
1707 static int
1708 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1709                      struct nlmsghdr *nlh, struct nlattr *cda[])
1710 {
1711         struct nf_conntrack_tuple tuple;
1712         struct nf_conntrack_expect *exp;
1713         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1714         u_int8_t u3 = nfmsg->nfgen_family;
1715         int err = 0;
1716
1717         if (!cda[CTA_EXPECT_TUPLE]
1718             || !cda[CTA_EXPECT_MASK]
1719             || !cda[CTA_EXPECT_MASTER])
1720                 return -EINVAL;
1721
1722         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1723         if (err < 0)
1724                 return err;
1725
1726         write_lock_bh(&nf_conntrack_lock);
1727         exp = __nf_ct_expect_find(&tuple);
1728
1729         if (!exp) {
1730                 write_unlock_bh(&nf_conntrack_lock);
1731                 err = -ENOENT;
1732                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1733                         err = ctnetlink_create_expect(cda, u3);
1734                 return err;
1735         }
1736
1737         err = -EEXIST;
1738         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1739                 err = ctnetlink_change_expect(exp, cda);
1740         write_unlock_bh(&nf_conntrack_lock);
1741
1742         return err;
1743 }
1744
1745 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1746 static struct notifier_block ctnl_notifier = {
1747         .notifier_call  = ctnetlink_conntrack_event,
1748 };
1749
1750 static struct notifier_block ctnl_notifier_exp = {
1751         .notifier_call  = ctnetlink_expect_event,
1752 };
1753 #endif
1754
1755 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1756         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1757                                             .attr_count = CTA_MAX,
1758                                             .policy = ct_nla_policy },
1759         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1760                                             .attr_count = CTA_MAX,
1761                                             .policy = ct_nla_policy },
1762         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1763                                             .attr_count = CTA_MAX,
1764                                             .policy = ct_nla_policy },
1765         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1766                                             .attr_count = CTA_MAX,
1767                                             .policy = ct_nla_policy },
1768 };
1769
1770 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1771         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1772                                             .attr_count = CTA_EXPECT_MAX,
1773                                             .policy = exp_nla_policy },
1774         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1775                                             .attr_count = CTA_EXPECT_MAX,
1776                                             .policy = exp_nla_policy },
1777         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1778                                             .attr_count = CTA_EXPECT_MAX,
1779                                             .policy = exp_nla_policy },
1780 };
1781
1782 static const struct nfnetlink_subsystem ctnl_subsys = {
1783         .name                           = "conntrack",
1784         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1785         .cb_count                       = IPCTNL_MSG_MAX,
1786         .cb                             = ctnl_cb,
1787 };
1788
1789 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1790         .name                           = "conntrack_expect",
1791         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1792         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1793         .cb                             = ctnl_exp_cb,
1794 };
1795
1796 MODULE_ALIAS("ip_conntrack_netlink");
1797 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1798 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1799
1800 static int __init ctnetlink_init(void)
1801 {
1802         int ret;
1803
1804         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1805         ret = nfnetlink_subsys_register(&ctnl_subsys);
1806         if (ret < 0) {
1807                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1808                 goto err_out;
1809         }
1810
1811         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1812         if (ret < 0) {
1813                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1814                 goto err_unreg_subsys;
1815         }
1816
1817 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1818         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1819         if (ret < 0) {
1820                 printk("ctnetlink_init: cannot register notifier.\n");
1821                 goto err_unreg_exp_subsys;
1822         }
1823
1824         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1825         if (ret < 0) {
1826                 printk("ctnetlink_init: cannot expect register notifier.\n");
1827                 goto err_unreg_notifier;
1828         }
1829 #endif
1830
1831         return 0;
1832
1833 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1834 err_unreg_notifier:
1835         nf_conntrack_unregister_notifier(&ctnl_notifier);
1836 err_unreg_exp_subsys:
1837         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1838 #endif
1839 err_unreg_subsys:
1840         nfnetlink_subsys_unregister(&ctnl_subsys);
1841 err_out:
1842         return ret;
1843 }
1844
1845 static void __exit ctnetlink_exit(void)
1846 {
1847         printk("ctnetlink: unregistering from nfnetlink.\n");
1848
1849 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1850         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1851         nf_conntrack_unregister_notifier(&ctnl_notifier);
1852 #endif
1853
1854         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1855         nfnetlink_subsys_unregister(&ctnl_subsys);
1856         return;
1857 }
1858
1859 module_init(ctnetlink_init);
1860 module_exit(ctnetlink_exit);