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/rculist_nulls.h>
  23 #include <linux/types.h>
  24 #include <linux/timer.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/errno.h>
  27 #include <linux/netlink.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/interrupt.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, 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 static int
 349 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 350                     int event, struct nf_conn *ct)
 351 {
 352         struct nlmsghdr *nlh;
 353         struct nfgenmsg *nfmsg;
 354         struct nlattr *nest_parms;
 355         unsigned int flags = pid ? NLM_F_MULTI : 0;
 356
 357         event |= NFNL_SUBSYS_CTNETLINK << 8;
 358         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 359         if (nlh == NULL)
 360                 goto nlmsg_failure;
 361
 362         nfmsg = nlmsg_data(nlh);
 363         nfmsg->nfgen_family = nf_ct_l3num(ct);
 364         nfmsg->version      = NFNETLINK_V0;
 365         nfmsg->res_id       = 0;
 366
 367         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 368         if (!nest_parms)
 369                 goto nla_put_failure;
 370         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 371                 goto nla_put_failure;
 372         nla_nest_end(skb, nest_parms);
 373
 374         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 375         if (!nest_parms)
 376                 goto nla_put_failure;
 377         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 378                 goto nla_put_failure;
 379         nla_nest_end(skb, nest_parms);
 380
 381         if (ctnetlink_dump_status(skb, ct) < 0 ||
 382             ctnetlink_dump_timeout(skb, ct) < 0 ||
 383             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 384             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 385             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 386             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 387             ctnetlink_dump_mark(skb, ct) < 0 ||
 388             ctnetlink_dump_secmark(skb, ct) < 0 ||
 389             ctnetlink_dump_id(skb, ct) < 0 ||
 390             ctnetlink_dump_use(skb, ct) < 0 ||
 391             ctnetlink_dump_master(skb, ct) < 0 ||
 392             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 393                 goto nla_put_failure;
 394
 395         nlmsg_end(skb, nlh);
 396         return skb->len;
 397
 398 nlmsg_failure:
 399 nla_put_failure:
 400         nlmsg_cancel(skb, nlh);
 401         return -1;
 402 }
 403
 404 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 405 static inline size_t
 406 ctnetlink_proto_size(const struct nf_conn *ct)
 407 {
 408         struct nf_conntrack_l3proto *l3proto;
 409         struct nf_conntrack_l4proto *l4proto;
 410         size_t len = 0;
 411
 412         rcu_read_lock();
 413         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 414         len += l3proto->nla_size;
 415
 416         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 417         len += l4proto->nla_size;
 418         rcu_read_unlock();
 419
 420         return len;
 421 }
 422
 423 static inline size_t
 424 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 425 {
 426         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 427                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 428                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 429                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 430                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 431                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 432                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 433 #ifdef CONFIG_NF_CT_ACCT
 434                + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 435                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 436                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 437 #endif
 438                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 439                + nla_total_size(0) /* CTA_PROTOINFO */
 440                + nla_total_size(0) /* CTA_HELP */
 441                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 442 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 443                + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
 444 #endif
 445 #ifdef CONFIG_NF_NAT_NEEDED
 446                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 447                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 448 #endif
 449 #ifdef CONFIG_NF_CONNTRACK_MARK
 450                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 451 #endif
 452                + ctnetlink_proto_size(ct)
 453                ;
 454 }
 455
 456 static int
 457 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 458 {
 459         struct nlmsghdr *nlh;
 460         struct nfgenmsg *nfmsg;
 461         struct nlattr *nest_parms;
 462         struct nf_conn *ct = item->ct;
 463         struct sk_buff *skb;
 464         unsigned int type;
 465         unsigned int flags = 0, group;
 466         int err;
 467
 468         /* ignore our fake conntrack entry */
 469         if (ct == &nf_conntrack_untracked)
 470                 return 0;
 471
 472         if (events & (1 << IPCT_DESTROY)) {
 473                 type = IPCTNL_MSG_CT_DELETE;
 474                 group = NFNLGRP_CONNTRACK_DESTROY;
 475         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 476                 type = IPCTNL_MSG_CT_NEW;
 477                 flags = NLM_F_CREATE|NLM_F_EXCL;
 478                 group = NFNLGRP_CONNTRACK_NEW;
 479         } else  if (events) {
 480                 type = IPCTNL_MSG_CT_NEW;
 481                 group = NFNLGRP_CONNTRACK_UPDATE;
 482         } else
 483                 return 0;
 484
 485         if (!item->report && !nfnetlink_has_listeners(group))
 486                 return 0;
 487
 488         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 489         if (skb == NULL)
 490                 goto errout;
 491
 492         type |= NFNL_SUBSYS_CTNETLINK << 8;
 493         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 494         if (nlh == NULL)
 495                 goto nlmsg_failure;
 496
 497         nfmsg = nlmsg_data(nlh);
 498         nfmsg->nfgen_family = nf_ct_l3num(ct);
 499         nfmsg->version  = NFNETLINK_V0;
 500         nfmsg->res_id   = 0;
 501
 502         rcu_read_lock();
 503         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 504         if (!nest_parms)
 505                 goto nla_put_failure;
 506         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 507                 goto nla_put_failure;
 508         nla_nest_end(skb, nest_parms);
 509
 510         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 511         if (!nest_parms)
 512                 goto nla_put_failure;
 513         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 514                 goto nla_put_failure;
 515         nla_nest_end(skb, nest_parms);
 516
 517         if (ctnetlink_dump_id(skb, ct) < 0)
 518                 goto nla_put_failure;
 519
 520         if (ctnetlink_dump_status(skb, ct) < 0)
 521                 goto nla_put_failure;
 522
 523         if (events & (1 << IPCT_DESTROY)) {
 524                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 525                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 526                         goto nla_put_failure;
 527         } else {
 528                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 529                         goto nla_put_failure;
 530
 531                 if (events & (1 << IPCT_PROTOINFO)
 532                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 533                         goto nla_put_failure;
 534
 535                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 536                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 537                         goto nla_put_failure;
 538
 539 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 540                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 541                     && ctnetlink_dump_secmark(skb, ct) < 0)
 542                         goto nla_put_failure;
 543 #endif
 544
 545                 if (events & (1 << IPCT_RELATED) &&
 546                     ctnetlink_dump_master(skb, ct) < 0)
 547                         goto nla_put_failure;
 548
 549                 if (events & (1 << IPCT_NATSEQADJ) &&
 550                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 551                         goto nla_put_failure;
 552         }
 553
 554 #ifdef CONFIG_NF_CONNTRACK_MARK
 555         if ((events & (1 << IPCT_MARK) || ct->mark)
 556             && ctnetlink_dump_mark(skb, ct) < 0)
 557                 goto nla_put_failure;
 558 #endif
 559         rcu_read_unlock();
 560
 561         nlmsg_end(skb, nlh);
 562         err = nfnetlink_send(skb, item->pid, group, item->report, GFP_ATOMIC);
 563         if (err == -ENOBUFS || err == -EAGAIN)
 564                 return -ENOBUFS;
 565
 566         return 0;
 567
 568 nla_put_failure:
 569         rcu_read_unlock();
 570         nlmsg_cancel(skb, nlh);
 571 nlmsg_failure:
 572         kfree_skb(skb);
 573 errout:
 574         nfnetlink_set_err(0, group, -ENOBUFS);
 575         return 0;
 576 }
 577 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 578
 579 static int ctnetlink_done(struct netlink_callback *cb)
 580 {
 581         if (cb->args[1])
 582                 nf_ct_put((struct nf_conn *)cb->args[1]);
 583         return 0;
 584 }
 585
 586 static int
 587 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 588 {
 589         struct nf_conn *ct, *last;
 590         struct nf_conntrack_tuple_hash *h;
 591         struct hlist_nulls_node *n;
 592         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 593         u_int8_t l3proto = nfmsg->nfgen_family;
 594
 595         rcu_read_lock();
 596         last = (struct nf_conn *)cb->args[1];
 597         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 598 restart:
 599                 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 600                                          hnnode) {
 601                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 602                                 continue;
 603                         ct = nf_ct_tuplehash_to_ctrack(h);
 604                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 605                                 continue;
 606                         /* Dump entries of a given L3 protocol number.
 607                          * If it is not specified, ie. l3proto == 0,
 608                          * then dump everything. */
 609                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 610                                 goto releasect;
 611                         if (cb->args[1]) {
 612                                 if (ct != last)
 613                                         goto releasect;
 614                                 cb->args[1] = 0;
 615                         }
 616                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 617                                                 cb->nlh->nlmsg_seq,
 618                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 619                                 cb->args[1] = (unsigned long)ct;
 620                                 goto out;
 621                         }
 622
 623                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 624                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 625                                 struct nf_conn_counter *acct;
 626
 627                                 acct = nf_conn_acct_find(ct);
 628                                 if (acct)
 629                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 630                         }
 631 releasect:
 632                 nf_ct_put(ct);
 633                 }
 634                 if (cb->args[1]) {
 635                         cb->args[1] = 0;
 636                         goto restart;
 637                 }
 638         }
 639 out:
 640         rcu_read_unlock();
 641         if (last)
 642                 nf_ct_put(last);
 643
 644         return skb->len;
 645 }
 646
 647 static inline int
 648 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 649 {
 650         struct nlattr *tb[CTA_IP_MAX+1];
 651         struct nf_conntrack_l3proto *l3proto;
 652         int ret = 0;
 653
 654         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 655
 656         rcu_read_lock();
 657         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 658
 659         if (likely(l3proto->nlattr_to_tuple)) {
 660                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 661                                           l3proto->nla_policy);
 662                 if (ret == 0)
 663                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 664         }
 665
 666         rcu_read_unlock();
 667
 668         return ret;
 669 }
 670
 671 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 672         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 673 };
 674
 675 static inline int
 676 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 677                             struct nf_conntrack_tuple *tuple)
 678 {
 679         struct nlattr *tb[CTA_PROTO_MAX+1];
 680         struct nf_conntrack_l4proto *l4proto;
 681         int ret = 0;
 682
 683         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 684         if (ret < 0)
 685                 return ret;
 686
 687         if (!tb[CTA_PROTO_NUM])
 688                 return -EINVAL;
 689         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 690
 691         rcu_read_lock();
 692         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 693
 694         if (likely(l4proto->nlattr_to_tuple)) {
 695                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 696                                           l4proto->nla_policy);
 697                 if (ret == 0)
 698                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 699         }
 700
 701         rcu_read_unlock();
 702
 703         return ret;
 704 }
 705
 706 static int
 707 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 708                       struct nf_conntrack_tuple *tuple,
 709                       enum ctattr_tuple type, u_int8_t l3num)
 710 {
 711         struct nlattr *tb[CTA_TUPLE_MAX+1];
 712         int err;
 713
 714         memset(tuple, 0, sizeof(*tuple));
 715
 716         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 717
 718         if (!tb[CTA_TUPLE_IP])
 719                 return -EINVAL;
 720
 721         tuple->src.l3num = l3num;
 722
 723         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 724         if (err < 0)
 725                 return err;
 726
 727         if (!tb[CTA_TUPLE_PROTO])
 728                 return -EINVAL;
 729
 730         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 731         if (err < 0)
 732                 return err;
 733
 734         /* orig and expect tuples get DIR_ORIGINAL */
 735         if (type == CTA_TUPLE_REPLY)
 736                 tuple->dst.dir = IP_CT_DIR_REPLY;
 737         else
 738                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 739
 740         return 0;
 741 }
 742
 743 static inline int
 744 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 745 {
 746         struct nlattr *tb[CTA_HELP_MAX+1];
 747
 748         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 749
 750         if (!tb[CTA_HELP_NAME])
 751                 return -EINVAL;
 752
 753         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 754
 755         return 0;
 756 }
 757
 758 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 759         [CTA_STATUS]            = { .type = NLA_U32 },
 760         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 761         [CTA_MARK]              = { .type = NLA_U32 },
 762         [CTA_USE]               = { .type = NLA_U32 },
 763         [CTA_ID]                = { .type = NLA_U32 },
 764 };
 765
 766 static int
 767 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 768                         const struct nlmsghdr *nlh,
 769                         const struct nlattr * const cda[])
 770 {
 771         struct nf_conntrack_tuple_hash *h;
 772         struct nf_conntrack_tuple tuple;
 773         struct nf_conn *ct;
 774         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 775         u_int8_t u3 = nfmsg->nfgen_family;
 776         int err = 0;
 777
 778         if (cda[CTA_TUPLE_ORIG])
 779                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 780         else if (cda[CTA_TUPLE_REPLY])
 781                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 782         else {
 783                 /* Flush the whole table */
 784                 nf_conntrack_flush_report(&init_net,
 785                                          NETLINK_CB(skb).pid,
 786                                          nlmsg_report(nlh));
 787                 return 0;
 788         }
 789
 790         if (err < 0)
 791                 return err;
 792
 793         h = nf_conntrack_find_get(&init_net, &tuple);
 794         if (!h)
 795                 return -ENOENT;
 796
 797         ct = nf_ct_tuplehash_to_ctrack(h);
 798
 799         if (cda[CTA_ID]) {
 800                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 801                 if (id != (u32)(unsigned long)ct) {
 802                         nf_ct_put(ct);
 803                         return -ENOENT;
 804                 }
 805         }
 806
 807         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 808                                       NETLINK_CB(skb).pid,
 809                                       nlmsg_report(nlh)) < 0) {
 810                 nf_ct_delete_from_lists(ct);
 811                 /* we failed to report the event, try later */
 812                 nf_ct_insert_dying_list(ct);
 813                 nf_ct_put(ct);
 814                 return 0;
 815         }
 816
 817         /* death_by_timeout would report the event again */
 818         set_bit(IPS_DYING_BIT, &ct->status);
 819
 820         nf_ct_kill(ct);
 821         nf_ct_put(ct);
 822
 823         return 0;
 824 }
 825
 826 static int
 827 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 828                         const struct nlmsghdr *nlh,
 829                         const struct nlattr * const cda[])
 830 {
 831         struct nf_conntrack_tuple_hash *h;
 832         struct nf_conntrack_tuple tuple;
 833         struct nf_conn *ct;
 834         struct sk_buff *skb2 = NULL;
 835         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 836         u_int8_t u3 = nfmsg->nfgen_family;
 837         int err = 0;
 838
 839         if (nlh->nlmsg_flags & NLM_F_DUMP)
 840                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 841                                           ctnetlink_done);
 842
 843         if (cda[CTA_TUPLE_ORIG])
 844                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 845         else if (cda[CTA_TUPLE_REPLY])
 846                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 847         else
 848                 return -EINVAL;
 849
 850         if (err < 0)
 851                 return err;
 852
 853         h = nf_conntrack_find_get(&init_net, &tuple);
 854         if (!h)
 855                 return -ENOENT;
 856
 857         ct = nf_ct_tuplehash_to_ctrack(h);
 858
 859         err = -ENOMEM;
 860         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 861         if (skb2 == NULL) {
 862                 nf_ct_put(ct);
 863                 return -ENOMEM;
 864         }
 865
 866         rcu_read_lock();
 867         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 868                                   IPCTNL_MSG_CT_NEW, ct);
 869         rcu_read_unlock();
 870         nf_ct_put(ct);
 871         if (err <= 0)
 872                 goto free;
 873
 874         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 875         if (err < 0)
 876                 goto out;
 877
 878         return 0;
 879
 880 free:
 881         kfree_skb(skb2);
 882 out:
 883         return err;
 884 }
 885
 886 #ifdef CONFIG_NF_NAT_NEEDED
 887 static int
 888 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 889                           enum nf_nat_manip_type manip,
 890                           const struct nlattr *attr)
 891 {
 892         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 893
 894         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 895         if (!parse_nat_setup) {
 896 #ifdef CONFIG_MODULES
 897                 rcu_read_unlock();
 898                 spin_unlock_bh(&nf_conntrack_lock);
 899                 nfnl_unlock();
 900                 if (request_module("nf-nat-ipv4") < 0) {
 901                         nfnl_lock();
 902                         spin_lock_bh(&nf_conntrack_lock);
 903                         rcu_read_lock();
 904                         return -EOPNOTSUPP;
 905                 }
 906                 nfnl_lock();
 907                 spin_lock_bh(&nf_conntrack_lock);
 908                 rcu_read_lock();
 909                 if (nfnetlink_parse_nat_setup_hook)
 910                         return -EAGAIN;
 911 #endif
 912                 return -EOPNOTSUPP;
 913         }
 914
 915         return parse_nat_setup(ct, manip, attr);
 916 }
 917 #endif
 918
 919 static int
 920 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
 921 {
 922         unsigned long d;
 923         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 924         d = ct->status ^ status;
 925
 926         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 927                 /* unchangeable */
 928                 return -EBUSY;
 929
 930         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 931                 /* SEEN_REPLY bit can only be set */
 932                 return -EBUSY;
 933
 934         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 935                 /* ASSURED bit can only be set */
 936                 return -EBUSY;
 937
 938         /* Be careful here, modifying NAT bits can screw up things,
 939          * so don't let users modify them directly if they don't pass
 940          * nf_nat_range. */
 941         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 942         return 0;
 943 }
 944
 945 static int
 946 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
 947 {
 948 #ifdef CONFIG_NF_NAT_NEEDED
 949         int ret;
 950
 951         if (cda[CTA_NAT_DST]) {
 952                 ret = ctnetlink_parse_nat_setup(ct,
 953                                                 IP_NAT_MANIP_DST,
 954                                                 cda[CTA_NAT_DST]);
 955                 if (ret < 0)
 956                         return ret;
 957         }
 958         if (cda[CTA_NAT_SRC]) {
 959                 ret = ctnetlink_parse_nat_setup(ct,
 960                                                 IP_NAT_MANIP_SRC,
 961                                                 cda[CTA_NAT_SRC]);
 962                 if (ret < 0)
 963                         return ret;
 964         }
 965         return 0;
 966 #else
 967         return -EOPNOTSUPP;
 968 #endif
 969 }
 970
 971 static inline int
 972 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
 973 {
 974         struct nf_conntrack_helper *helper;
 975         struct nf_conn_help *help = nfct_help(ct);
 976         char *helpname = NULL;
 977         int err;
 978
 979         /* don't change helper of sibling connections */
 980         if (ct->master)
 981                 return -EBUSY;
 982
 983         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 984         if (err < 0)
 985                 return err;
 986
 987         if (!strcmp(helpname, "")) {
 988                 if (help && help->helper) {
 989                         /* we had a helper before ... */
 990                         nf_ct_remove_expectations(ct);
 991                         rcu_assign_pointer(help->helper, NULL);
 992                 }
 993
 994                 return 0;
 995         }
 996
 997         helper = __nf_conntrack_helper_find_byname(helpname);
 998         if (helper == NULL) {
 999 #ifdef CONFIG_MODULES
1000                 spin_unlock_bh(&nf_conntrack_lock);
1001
1002                 if (request_module("nfct-helper-%s", helpname) < 0) {
1003                         spin_lock_bh(&nf_conntrack_lock);
1004                         return -EOPNOTSUPP;
1005                 }
1006
1007                 spin_lock_bh(&nf_conntrack_lock);
1008                 helper = __nf_conntrack_helper_find_byname(helpname);
1009                 if (helper)
1010                         return -EAGAIN;
1011 #endif
1012                 return -EOPNOTSUPP;
1013         }
1014
1015         if (help) {
1016                 if (help->helper == helper)
1017                         return 0;
1018                 if (help->helper)
1019                         return -EBUSY;
1020                 /* need to zero data of old helper */
1021                 memset(&help->help, 0, sizeof(help->help));
1022         } else {
1023                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1024                 if (help == NULL)
1025                         return -ENOMEM;
1026         }
1027
1028         rcu_assign_pointer(help->helper, helper);
1029
1030         return 0;
1031 }
1032
1033 static inline int
1034 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1035 {
1036         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1037
1038         if (!del_timer(&ct->timeout))
1039                 return -ETIME;
1040
1041         ct->timeout.expires = jiffies + timeout * HZ;
1042         add_timer(&ct->timeout);
1043
1044         return 0;
1045 }
1046
1047 static inline int
1048 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1049 {
1050         const struct nlattr *attr = cda[CTA_PROTOINFO];
1051         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1052         struct nf_conntrack_l4proto *l4proto;
1053         int err = 0;
1054
1055         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1056
1057         rcu_read_lock();
1058         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1059         if (l4proto->from_nlattr)
1060                 err = l4proto->from_nlattr(tb, ct);
1061         rcu_read_unlock();
1062
1063         return err;
1064 }
1065
1066 #ifdef CONFIG_NF_NAT_NEEDED
1067 static inline int
1068 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1069 {
1070         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1071
1072         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1073
1074         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1075                 return -EINVAL;
1076
1077         natseq->correction_pos =
1078                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1079
1080         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1081                 return -EINVAL;
1082
1083         natseq->offset_before =
1084                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1085
1086         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1087                 return -EINVAL;
1088
1089         natseq->offset_after =
1090                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1091
1092         return 0;
1093 }
1094
1095 static int
1096 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1097                              const struct nlattr * const cda[])
1098 {
1099         int ret = 0;
1100         struct nf_conn_nat *nat = nfct_nat(ct);
1101
1102         if (!nat)
1103                 return 0;
1104
1105         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1106                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1107                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1108                 if (ret < 0)
1109                         return ret;
1110
1111                 ct->status |= IPS_SEQ_ADJUST;
1112         }
1113
1114         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1115                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1116                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1117                 if (ret < 0)
1118                         return ret;
1119
1120                 ct->status |= IPS_SEQ_ADJUST;
1121         }
1122
1123         return 0;
1124 }
1125 #endif
1126
1127 static int
1128 ctnetlink_change_conntrack(struct nf_conn *ct,
1129                            const struct nlattr * const cda[])
1130 {
1131         int err;
1132
1133         /* only allow NAT changes and master assignation for new conntracks */
1134         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1135                 return -EOPNOTSUPP;
1136
1137         if (cda[CTA_HELP]) {
1138                 err = ctnetlink_change_helper(ct, cda);
1139                 if (err < 0)
1140                         return err;
1141         }
1142
1143         if (cda[CTA_TIMEOUT]) {
1144                 err = ctnetlink_change_timeout(ct, cda);
1145                 if (err < 0)
1146                         return err;
1147         }
1148
1149         if (cda[CTA_STATUS]) {
1150                 err = ctnetlink_change_status(ct, cda);
1151                 if (err < 0)
1152                         return err;
1153         }
1154
1155         if (cda[CTA_PROTOINFO]) {
1156                 err = ctnetlink_change_protoinfo(ct, cda);
1157                 if (err < 0)
1158                         return err;
1159         }
1160
1161 #if defined(CONFIG_NF_CONNTRACK_MARK)
1162         if (cda[CTA_MARK])
1163                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1164 #endif
1165
1166 #ifdef CONFIG_NF_NAT_NEEDED
1167         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1168                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1169                 if (err < 0)
1170                         return err;
1171         }
1172 #endif
1173
1174         return 0;
1175 }
1176
1177 static struct nf_conn *
1178 ctnetlink_create_conntrack(const struct nlattr * const cda[],
1179                            struct nf_conntrack_tuple *otuple,
1180                            struct nf_conntrack_tuple *rtuple,
1181                            u8 u3)
1182 {
1183         struct nf_conn *ct;
1184         int err = -EINVAL;
1185         struct nf_conntrack_helper *helper;
1186
1187         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1188         if (IS_ERR(ct))
1189                 return ERR_PTR(-ENOMEM);
1190
1191         if (!cda[CTA_TIMEOUT])
1192                 goto err1;
1193         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1194
1195         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1196         ct->status |= IPS_CONFIRMED;
1197
1198         rcu_read_lock();
1199         if (cda[CTA_HELP]) {
1200                 char *helpname = NULL;
1201
1202                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1203                 if (err < 0)
1204                         goto err2;
1205
1206                 helper = __nf_conntrack_helper_find_byname(helpname);
1207                 if (helper == NULL) {
1208                         rcu_read_unlock();
1209 #ifdef CONFIG_MODULES
1210                         if (request_module("nfct-helper-%s", helpname) < 0) {
1211                                 err = -EOPNOTSUPP;
1212                                 goto err1;
1213                         }
1214
1215                         rcu_read_lock();
1216                         helper = __nf_conntrack_helper_find_byname(helpname);
1217                         if (helper) {
1218                                 err = -EAGAIN;
1219                                 goto err2;
1220                         }
1221                         rcu_read_unlock();
1222 #endif
1223                         err = -EOPNOTSUPP;
1224                         goto err1;
1225                 } else {
1226                         struct nf_conn_help *help;
1227
1228                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1229                         if (help == NULL) {
1230                                 err = -ENOMEM;
1231                                 goto err2;
1232                         }
1233
1234                         /* not in hash table yet so not strictly necessary */
1235                         rcu_assign_pointer(help->helper, helper);
1236                 }
1237         } else {
1238                 /* try an implicit helper assignation */
1239                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1240                 if (err < 0)
1241                         goto err2;
1242         }
1243
1244         if (cda[CTA_STATUS]) {
1245                 err = ctnetlink_change_status(ct, cda);
1246                 if (err < 0)
1247                         goto err2;
1248         }
1249
1250         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1251                 err = ctnetlink_change_nat(ct, cda);
1252                 if (err < 0)
1253                         goto err2;
1254         }
1255
1256 #ifdef CONFIG_NF_NAT_NEEDED
1257         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1258                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1259                 if (err < 0)
1260                         goto err2;
1261         }
1262 #endif
1263
1264         if (cda[CTA_PROTOINFO]) {
1265                 err = ctnetlink_change_protoinfo(ct, cda);
1266                 if (err < 0)
1267                         goto err2;
1268         }
1269
1270         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1271         nf_ct_ecache_ext_add(ct, GFP_ATOMIC);
1272
1273 #if defined(CONFIG_NF_CONNTRACK_MARK)
1274         if (cda[CTA_MARK])
1275                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1276 #endif
1277
1278         /* setup master conntrack: this is a confirmed expectation */
1279         if (cda[CTA_TUPLE_MASTER]) {
1280                 struct nf_conntrack_tuple master;
1281                 struct nf_conntrack_tuple_hash *master_h;
1282                 struct nf_conn *master_ct;
1283
1284                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1285                 if (err < 0)
1286                         goto err2;
1287
1288                 master_h = nf_conntrack_find_get(&init_net, &master);
1289                 if (master_h == NULL) {
1290                         err = -ENOENT;
1291                         goto err2;
1292                 }
1293                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1294                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1295                 ct->master = master_ct;
1296         }
1297
1298         add_timer(&ct->timeout);
1299         nf_conntrack_hash_insert(ct);
1300         rcu_read_unlock();
1301
1302         return ct;
1303
1304 err2:
1305         rcu_read_unlock();
1306 err1:
1307         nf_conntrack_free(ct);
1308         return ERR_PTR(err);
1309 }
1310
1311 static int
1312 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1313                         const struct nlmsghdr *nlh,
1314                         const struct nlattr * const cda[])
1315 {
1316         struct nf_conntrack_tuple otuple, rtuple;
1317         struct nf_conntrack_tuple_hash *h = NULL;
1318         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1319         u_int8_t u3 = nfmsg->nfgen_family;
1320         int err = 0;
1321
1322         if (cda[CTA_TUPLE_ORIG]) {
1323                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1324                 if (err < 0)
1325                         return err;
1326         }
1327
1328         if (cda[CTA_TUPLE_REPLY]) {
1329                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1330                 if (err < 0)
1331                         return err;
1332         }
1333
1334         spin_lock_bh(&nf_conntrack_lock);
1335         if (cda[CTA_TUPLE_ORIG])
1336                 h = __nf_conntrack_find(&init_net, &otuple);
1337         else if (cda[CTA_TUPLE_REPLY])
1338                 h = __nf_conntrack_find(&init_net, &rtuple);
1339
1340         if (h == NULL) {
1341                 err = -ENOENT;
1342                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1343                         struct nf_conn *ct;
1344                         enum ip_conntrack_events events;
1345
1346                         ct = ctnetlink_create_conntrack(cda, &otuple,
1347                                                         &rtuple, u3);
1348                         if (IS_ERR(ct)) {
1349                                 err = PTR_ERR(ct);
1350                                 goto out_unlock;
1351                         }
1352                         err = 0;
1353                         nf_conntrack_get(&ct->ct_general);
1354                         spin_unlock_bh(&nf_conntrack_lock);
1355                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1356                                 events = IPCT_RELATED;
1357                         else
1358                                 events = IPCT_NEW;
1359
1360                         nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1361                                                       (1 << IPCT_HELPER) |
1362                                                       (1 << IPCT_PROTOINFO) |
1363                                                       (1 << IPCT_NATSEQADJ) |
1364                                                       (1 << IPCT_MARK) | events,
1365                                                       ct, NETLINK_CB(skb).pid,
1366                                                       nlmsg_report(nlh));
1367                         nf_ct_put(ct);
1368                 } else
1369                         spin_unlock_bh(&nf_conntrack_lock);
1370
1371                 return err;
1372         }
1373         /* implicit 'else' */
1374
1375         /* We manipulate the conntrack inside the global conntrack table lock,
1376          * so there's no need to increase the refcount */
1377         err = -EEXIST;
1378         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1379                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1380
1381                 err = ctnetlink_change_conntrack(ct, cda);
1382                 if (err == 0) {
1383                         nf_conntrack_get(&ct->ct_general);
1384                         spin_unlock_bh(&nf_conntrack_lock);
1385                         nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1386                                                       (1 << IPCT_HELPER) |
1387                                                       (1 << IPCT_PROTOINFO) |
1388                                                       (1 << IPCT_NATSEQADJ) |
1389                                                       (1 << IPCT_MARK),
1390                                                       ct, NETLINK_CB(skb).pid,
1391                                                       nlmsg_report(nlh));
1392                         nf_ct_put(ct);
1393                 } else
1394                         spin_unlock_bh(&nf_conntrack_lock);
1395
1396                 return err;
1397         }
1398
1399 out_unlock:
1400         spin_unlock_bh(&nf_conntrack_lock);
1401         return err;
1402 }
1403
1404 /***********************************************************************
1405  * EXPECT
1406  ***********************************************************************/
1407
1408 static inline int
1409 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1410                          const struct nf_conntrack_tuple *tuple,
1411                          enum ctattr_expect type)
1412 {
1413         struct nlattr *nest_parms;
1414
1415         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1416         if (!nest_parms)
1417                 goto nla_put_failure;
1418         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1419                 goto nla_put_failure;
1420         nla_nest_end(skb, nest_parms);
1421
1422         return 0;
1423
1424 nla_put_failure:
1425         return -1;
1426 }
1427
1428 static inline int
1429 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1430                         const struct nf_conntrack_tuple *tuple,
1431                         const struct nf_conntrack_tuple_mask *mask)
1432 {
1433         int ret;
1434         struct nf_conntrack_l3proto *l3proto;
1435         struct nf_conntrack_l4proto *l4proto;
1436         struct nf_conntrack_tuple m;
1437         struct nlattr *nest_parms;
1438
1439         memset(&m, 0xFF, sizeof(m));
1440         m.src.u.all = mask->src.u.all;
1441         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1442
1443         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1444         if (!nest_parms)
1445                 goto nla_put_failure;
1446
1447         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1448         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1449
1450         if (unlikely(ret < 0))
1451                 goto nla_put_failure;
1452
1453         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1454         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1455         if (unlikely(ret < 0))
1456                 goto nla_put_failure;
1457
1458         nla_nest_end(skb, nest_parms);
1459
1460         return 0;
1461
1462 nla_put_failure:
1463         return -1;
1464 }
1465
1466 static int
1467 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1468                           const struct nf_conntrack_expect *exp)
1469 {
1470         struct nf_conn *master = exp->master;
1471         long timeout = (exp->timeout.expires - jiffies) / HZ;
1472
1473         if (timeout < 0)
1474                 timeout = 0;
1475
1476         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1477                 goto nla_put_failure;
1478         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1479                 goto nla_put_failure;
1480         if (ctnetlink_exp_dump_tuple(skb,
1481                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1482                                  CTA_EXPECT_MASTER) < 0)
1483                 goto nla_put_failure;
1484
1485         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1486         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1487
1488         return 0;
1489
1490 nla_put_failure:
1491         return -1;
1492 }
1493
1494 static int
1495 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1496                         int event, const struct nf_conntrack_expect *exp)
1497 {
1498         struct nlmsghdr *nlh;
1499         struct nfgenmsg *nfmsg;
1500         unsigned int flags = pid ? NLM_F_MULTI : 0;
1501
1502         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1503         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1504         if (nlh == NULL)
1505                 goto nlmsg_failure;
1506
1507         nfmsg = nlmsg_data(nlh);
1508         nfmsg->nfgen_family = exp->tuple.src.l3num;
1509         nfmsg->version      = NFNETLINK_V0;
1510         nfmsg->res_id       = 0;
1511
1512         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1513                 goto nla_put_failure;
1514
1515         nlmsg_end(skb, nlh);
1516         return skb->len;
1517
1518 nlmsg_failure:
1519 nla_put_failure:
1520         nlmsg_cancel(skb, nlh);
1521         return -1;
1522 }
1523
1524 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1525 static int
1526 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1527 {
1528         struct nlmsghdr *nlh;
1529         struct nfgenmsg *nfmsg;
1530         struct nf_conntrack_expect *exp = item->exp;
1531         struct sk_buff *skb;
1532         unsigned int type;
1533         int flags = 0;
1534
1535         if (events & (1 << IPEXP_NEW)) {
1536                 type = IPCTNL_MSG_EXP_NEW;
1537                 flags = NLM_F_CREATE|NLM_F_EXCL;
1538         } else
1539                 return 0;
1540
1541         if (!item->report &&
1542             !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1543                 return 0;
1544
1545         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1546         if (skb == NULL)
1547                 goto errout;
1548
1549         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1550         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1551         if (nlh == NULL)
1552                 goto nlmsg_failure;
1553
1554         nfmsg = nlmsg_data(nlh);
1555         nfmsg->nfgen_family = exp->tuple.src.l3num;
1556         nfmsg->version      = NFNETLINK_V0;
1557         nfmsg->res_id       = 0;
1558
1559         rcu_read_lock();
1560         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1561                 goto nla_put_failure;
1562         rcu_read_unlock();
1563
1564         nlmsg_end(skb, nlh);
1565         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1566                        item->report, GFP_ATOMIC);
1567         return 0;
1568
1569 nla_put_failure:
1570         rcu_read_unlock();
1571         nlmsg_cancel(skb, nlh);
1572 nlmsg_failure:
1573         kfree_skb(skb);
1574 errout:
1575         nfnetlink_set_err(0, 0, -ENOBUFS);
1576         return 0;
1577 }
1578 #endif
1579 static int ctnetlink_exp_done(struct netlink_callback *cb)
1580 {
1581         if (cb->args[1])
1582                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1583         return 0;
1584 }
1585
1586 static int
1587 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1588 {
1589         struct net *net = &init_net;
1590         struct nf_conntrack_expect *exp, *last;
1591         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1592         struct hlist_node *n;
1593         u_int8_t l3proto = nfmsg->nfgen_family;
1594
1595         rcu_read_lock();
1596         last = (struct nf_conntrack_expect *)cb->args[1];
1597         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1598 restart:
1599                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1600                                      hnode) {
1601                         if (l3proto && exp->tuple.src.l3num != l3proto)
1602                                 continue;
1603                         if (cb->args[1]) {
1604                                 if (exp != last)
1605                                         continue;
1606                                 cb->args[1] = 0;
1607                         }
1608                         if (ctnetlink_exp_fill_info(skb,
1609                                                     NETLINK_CB(cb->skb).pid,
1610                                                     cb->nlh->nlmsg_seq,
1611                                                     IPCTNL_MSG_EXP_NEW,
1612                                                     exp) < 0) {
1613                                 if (!atomic_inc_not_zero(&exp->use))
1614                                         continue;
1615                                 cb->args[1] = (unsigned long)exp;
1616                                 goto out;
1617                         }
1618                 }
1619                 if (cb->args[1]) {
1620                         cb->args[1] = 0;
1621                         goto restart;
1622                 }
1623         }
1624 out:
1625         rcu_read_unlock();
1626         if (last)
1627                 nf_ct_expect_put(last);
1628
1629         return skb->len;
1630 }
1631
1632 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1633         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1634         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1635 };
1636
1637 static int
1638 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1639                      const struct nlmsghdr *nlh,
1640                      const struct nlattr * const cda[])
1641 {
1642         struct nf_conntrack_tuple tuple;
1643         struct nf_conntrack_expect *exp;
1644         struct sk_buff *skb2;
1645         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1646         u_int8_t u3 = nfmsg->nfgen_family;
1647         int err = 0;
1648
1649         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1650                 return netlink_dump_start(ctnl, skb, nlh,
1651                                           ctnetlink_exp_dump_table,
1652                                           ctnetlink_exp_done);
1653         }
1654
1655         if (cda[CTA_EXPECT_MASTER])
1656                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1657         else
1658                 return -EINVAL;
1659
1660         if (err < 0)
1661                 return err;
1662
1663         exp = nf_ct_expect_find_get(&init_net, &tuple);
1664         if (!exp)
1665                 return -ENOENT;
1666
1667         if (cda[CTA_EXPECT_ID]) {
1668                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1669                 if (ntohl(id) != (u32)(unsigned long)exp) {
1670                         nf_ct_expect_put(exp);
1671                         return -ENOENT;
1672                 }
1673         }
1674
1675         err = -ENOMEM;
1676         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1677         if (skb2 == NULL)
1678                 goto out;
1679
1680         rcu_read_lock();
1681         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1682                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1683         rcu_read_unlock();
1684         if (err <= 0)
1685                 goto free;
1686
1687         nf_ct_expect_put(exp);
1688
1689         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1690
1691 free:
1692         kfree_skb(skb2);
1693 out:
1694         nf_ct_expect_put(exp);
1695         return err;
1696 }
1697
1698 static int
1699 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1700                      const struct nlmsghdr *nlh,
1701                      const struct nlattr * const cda[])
1702 {
1703         struct nf_conntrack_expect *exp;
1704         struct nf_conntrack_tuple tuple;
1705         struct nf_conntrack_helper *h;
1706         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1707         struct hlist_node *n, *next;
1708         u_int8_t u3 = nfmsg->nfgen_family;
1709         unsigned int i;
1710         int err;
1711
1712         if (cda[CTA_EXPECT_TUPLE]) {
1713                 /* delete a single expect by tuple */
1714                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1715                 if (err < 0)
1716                         return err;
1717
1718                 /* bump usage count to 2 */
1719                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1720                 if (!exp)
1721                         return -ENOENT;
1722
1723                 if (cda[CTA_EXPECT_ID]) {
1724                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1725                         if (ntohl(id) != (u32)(unsigned long)exp) {
1726                                 nf_ct_expect_put(exp);
1727                                 return -ENOENT;
1728                         }
1729                 }
1730
1731                 /* after list removal, usage count == 1 */
1732                 nf_ct_unexpect_related(exp);
1733                 /* have to put what we 'get' above.
1734                  * after this line usage count == 0 */
1735                 nf_ct_expect_put(exp);
1736         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1737                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1738                 struct nf_conn_help *m_help;
1739
1740                 /* delete all expectations for this helper */
1741                 spin_lock_bh(&nf_conntrack_lock);
1742                 h = __nf_conntrack_helper_find_byname(name);
1743                 if (!h) {
1744                         spin_unlock_bh(&nf_conntrack_lock);
1745                         return -EOPNOTSUPP;
1746                 }
1747                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1748                         hlist_for_each_entry_safe(exp, n, next,
1749                                                   &init_net.ct.expect_hash[i],
1750                                                   hnode) {
1751                                 m_help = nfct_help(exp->master);
1752                                 if (m_help->helper == h
1753                                     && del_timer(&exp->timeout)) {
1754                                         nf_ct_unlink_expect(exp);
1755                                         nf_ct_expect_put(exp);
1756                                 }
1757                         }
1758                 }
1759                 spin_unlock_bh(&nf_conntrack_lock);
1760         } else {
1761                 /* This basically means we have to flush everything*/
1762                 spin_lock_bh(&nf_conntrack_lock);
1763                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1764                         hlist_for_each_entry_safe(exp, n, next,
1765                                                   &init_net.ct.expect_hash[i],
1766                                                   hnode) {
1767                                 if (del_timer(&exp->timeout)) {
1768                                         nf_ct_unlink_expect(exp);
1769                                         nf_ct_expect_put(exp);
1770                                 }
1771                         }
1772                 }
1773                 spin_unlock_bh(&nf_conntrack_lock);
1774         }
1775
1776         return 0;
1777 }
1778 static int
1779 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1780                         const struct nlattr * const cda[])
1781 {
1782         return -EOPNOTSUPP;
1783 }
1784
1785 static int
1786 ctnetlink_create_expect(const struct nlattr * const cda[], u_int8_t u3,
1787                         u32 pid, int report)
1788 {
1789         struct nf_conntrack_tuple tuple, mask, master_tuple;
1790         struct nf_conntrack_tuple_hash *h = NULL;
1791         struct nf_conntrack_expect *exp;
1792         struct nf_conn *ct;
1793         struct nf_conn_help *help;
1794         int err = 0;
1795
1796         /* caller guarantees that those three CTA_EXPECT_* exist */
1797         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1798         if (err < 0)
1799                 return err;
1800         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1801         if (err < 0)
1802                 return err;
1803         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1804         if (err < 0)
1805                 return err;
1806
1807         /* Look for master conntrack of this expectation */
1808         h = nf_conntrack_find_get(&init_net, &master_tuple);
1809         if (!h)
1810                 return -ENOENT;
1811         ct = nf_ct_tuplehash_to_ctrack(h);
1812         help = nfct_help(ct);
1813
1814         if (!help || !help->helper) {
1815                 /* such conntrack hasn't got any helper, abort */
1816                 err = -EOPNOTSUPP;
1817                 goto out;
1818         }
1819
1820         exp = nf_ct_expect_alloc(ct);
1821         if (!exp) {
1822                 err = -ENOMEM;
1823                 goto out;
1824         }
1825
1826         exp->class = 0;
1827         exp->expectfn = NULL;
1828         exp->flags = 0;
1829         exp->master = ct;
1830         exp->helper = NULL;
1831         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1832         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1833         exp->mask.src.u.all = mask.src.u.all;
1834
1835         err = nf_ct_expect_related_report(exp, pid, report);
1836         nf_ct_expect_put(exp);
1837
1838 out:
1839         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1840         return err;
1841 }
1842
1843 static int
1844 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1845                      const struct nlmsghdr *nlh,
1846                      const struct nlattr * const cda[])
1847 {
1848         struct nf_conntrack_tuple tuple;
1849         struct nf_conntrack_expect *exp;
1850         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1851         u_int8_t u3 = nfmsg->nfgen_family;
1852         int err = 0;
1853
1854         if (!cda[CTA_EXPECT_TUPLE]
1855             || !cda[CTA_EXPECT_MASK]
1856             || !cda[CTA_EXPECT_MASTER])
1857                 return -EINVAL;
1858
1859         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1860         if (err < 0)
1861                 return err;
1862
1863         spin_lock_bh(&nf_conntrack_lock);
1864         exp = __nf_ct_expect_find(&init_net, &tuple);
1865
1866         if (!exp) {
1867                 spin_unlock_bh(&nf_conntrack_lock);
1868                 err = -ENOENT;
1869                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1870                         err = ctnetlink_create_expect(cda,
1871                                                       u3,
1872                                                       NETLINK_CB(skb).pid,
1873                                                       nlmsg_report(nlh));
1874                 }
1875                 return err;
1876         }
1877
1878         err = -EEXIST;
1879         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1880                 err = ctnetlink_change_expect(exp, cda);
1881         spin_unlock_bh(&nf_conntrack_lock);
1882
1883         return err;
1884 }
1885
1886 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1887 static struct nf_ct_event_notifier ctnl_notifier = {
1888         .fcn = ctnetlink_conntrack_event,
1889 };
1890
1891 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1892         .fcn = ctnetlink_expect_event,
1893 };
1894 #endif
1895
1896 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1897         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1898                                             .attr_count = CTA_MAX,
1899                                             .policy = ct_nla_policy },
1900         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1901                                             .attr_count = CTA_MAX,
1902                                             .policy = ct_nla_policy },
1903         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1904                                             .attr_count = CTA_MAX,
1905                                             .policy = ct_nla_policy },
1906         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1907                                             .attr_count = CTA_MAX,
1908                                             .policy = ct_nla_policy },
1909 };
1910
1911 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1912         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1913                                             .attr_count = CTA_EXPECT_MAX,
1914                                             .policy = exp_nla_policy },
1915         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1916                                             .attr_count = CTA_EXPECT_MAX,
1917                                             .policy = exp_nla_policy },
1918         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1919                                             .attr_count = CTA_EXPECT_MAX,
1920                                             .policy = exp_nla_policy },
1921 };
1922
1923 static const struct nfnetlink_subsystem ctnl_subsys = {
1924         .name                           = "conntrack",
1925         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1926         .cb_count                       = IPCTNL_MSG_MAX,
1927         .cb                             = ctnl_cb,
1928 };
1929
1930 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1931         .name                           = "conntrack_expect",
1932         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1933         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1934         .cb                             = ctnl_exp_cb,
1935 };
1936
1937 MODULE_ALIAS("ip_conntrack_netlink");
1938 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1939 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1940
1941 static int __init ctnetlink_init(void)
1942 {
1943         int ret;
1944
1945         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1946         ret = nfnetlink_subsys_register(&ctnl_subsys);
1947         if (ret < 0) {
1948                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1949                 goto err_out;
1950         }
1951
1952         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1953         if (ret < 0) {
1954                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1955                 goto err_unreg_subsys;
1956         }
1957
1958 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1959         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1960         if (ret < 0) {
1961                 printk("ctnetlink_init: cannot register notifier.\n");
1962                 goto err_unreg_exp_subsys;
1963         }
1964
1965         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1966         if (ret < 0) {
1967                 printk("ctnetlink_init: cannot expect register notifier.\n");
1968                 goto err_unreg_notifier;
1969         }
1970 #endif
1971
1972         return 0;
1973
1974 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1975 err_unreg_notifier:
1976         nf_conntrack_unregister_notifier(&ctnl_notifier);
1977 err_unreg_exp_subsys:
1978         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1979 #endif
1980 err_unreg_subsys:
1981         nfnetlink_subsys_unregister(&ctnl_subsys);
1982 err_out:
1983         return ret;
1984 }
1985
1986 static void __exit ctnetlink_exit(void)
1987 {
1988         printk("ctnetlink: unregistering from nfnetlink.\n");
1989
1990 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1991         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1992         nf_conntrack_unregister_notifier(&ctnl_notifier);
1993 #endif
1994
1995         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1996         nfnetlink_subsys_unregister(&ctnl_subsys);
1997         return;
1998 }
1999
2000 module_init(ctnetlink_init);
2001 module_exit(ctnetlink_exit);