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/sock.h>
  34 #include <net/netfilter/nf_conntrack.h>
  35 #include <net/netfilter/nf_conntrack_core.h>
  36 #include <net/netfilter/nf_conntrack_expect.h>
  37 #include <net/netfilter/nf_conntrack_helper.h>
  38 #include <net/netfilter/nf_conntrack_l3proto.h>
  39 #include <net/netfilter/nf_conntrack_l4proto.h>
  40 #include <net/netfilter/nf_conntrack_tuple.h>
  41 #include <net/netfilter/nf_conntrack_acct.h>
  42 #ifdef CONFIG_NF_NAT_NEEDED
  43 #include <net/netfilter/nf_nat_core.h>
  44 #include <net/netfilter/nf_nat_protocol.h>
  45 #endif
  46
  47 #include <linux/netfilter/nfnetlink.h>
  48 #include <linux/netfilter/nfnetlink_conntrack.h>
  49
  50 MODULE_LICENSE("GPL");
  51
  52 static char __initdata version[] = "0.93";
  53
  54 static inline int
  55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  56                             const struct nf_conntrack_tuple *tuple,
  57                             struct nf_conntrack_l4proto *l4proto)
  58 {
  59         int ret = 0;
  60         struct nlattr *nest_parms;
  61
  62         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  63         if (!nest_parms)
  64                 goto nla_put_failure;
  65         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  66
  67         if (likely(l4proto->tuple_to_nlattr))
  68                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  69
  70         nla_nest_end(skb, nest_parms);
  71
  72         return ret;
  73
  74 nla_put_failure:
  75         return -1;
  76 }
  77
  78 static inline int
  79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  80                          const struct nf_conntrack_tuple *tuple,
  81                          struct nf_conntrack_l3proto *l3proto)
  82 {
  83         int ret = 0;
  84         struct nlattr *nest_parms;
  85
  86         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  87         if (!nest_parms)
  88                 goto nla_put_failure;
  89
  90         if (likely(l3proto->tuple_to_nlattr))
  91                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  92
  93         nla_nest_end(skb, nest_parms);
  94
  95         return ret;
  96
  97 nla_put_failure:
  98         return -1;
  99 }
 100
 101 static int
 102 ctnetlink_dump_tuples(struct sk_buff *skb,
 103                       const struct nf_conntrack_tuple *tuple)
 104 {
 105         int ret;
 106         struct nf_conntrack_l3proto *l3proto;
 107         struct nf_conntrack_l4proto *l4proto;
 108
 109         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 110         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 111
 112         if (unlikely(ret < 0))
 113                 return ret;
 114
 115         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 116         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 117
 118         return ret;
 119 }
 120
 121 static inline int
 122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 123 {
 124         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->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 = (ct->timeout.expires - jiffies) / HZ;
 135
 136         if (timeout < 0)
 137                 timeout = 0;
 138
 139         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 140         return 0;
 141
 142 nla_put_failure:
 143         return -1;
 144 }
 145
 146 static inline int
 147 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 148 {
 149         struct nf_conntrack_l4proto *l4proto;
 150         struct nlattr *nest_proto;
 151         int ret;
 152
 153         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 154         if (!l4proto->to_nlattr)
 155                 return 0;
 156
 157         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 158         if (!nest_proto)
 159                 goto nla_put_failure;
 160
 161         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 162
 163         nla_nest_end(skb, nest_proto);
 164
 165         return ret;
 166
 167 nla_put_failure:
 168         return -1;
 169 }
 170
 171 static inline int
 172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 173 {
 174         struct nlattr *nest_helper;
 175         const struct nf_conn_help *help = nfct_help(ct);
 176         struct nf_conntrack_helper *helper;
 177
 178         if (!help)
 179                 return 0;
 180
 181         helper = rcu_dereference(help->helper);
 182         if (!helper)
 183                 goto out;
 184
 185         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 186         if (!nest_helper)
 187                 goto nla_put_failure;
 188         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 189
 190         if (helper->to_nlattr)
 191                 helper->to_nlattr(skb, ct);
 192
 193         nla_nest_end(skb, nest_helper);
 194 out:
 195         return 0;
 196
 197 nla_put_failure:
 198         return -1;
 199 }
 200
 201 static int
 202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 203                         enum ip_conntrack_dir dir)
 204 {
 205         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 206         struct nlattr *nest_count;
 207         const struct nf_conn_counter *acct;
 208
 209         acct = nf_conn_acct_find(ct);
 210         if (!acct)
 211                 return 0;
 212
 213         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 214         if (!nest_count)
 215                 goto nla_put_failure;
 216
 217         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 218                      cpu_to_be64(acct[dir].packets));
 219         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 220                      cpu_to_be64(acct[dir].bytes));
 221
 222         nla_nest_end(skb, nest_count);
 223
 224         return 0;
 225
 226 nla_put_failure:
 227         return -1;
 228 }
 229
 230 #ifdef CONFIG_NF_CONNTRACK_MARK
 231 static inline int
 232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 233 {
 234         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 235         return 0;
 236
 237 nla_put_failure:
 238         return -1;
 239 }
 240 #else
 241 #define ctnetlink_dump_mark(a, b) (0)
 242 #endif
 243
 244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 245 static inline int
 246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 247 {
 248         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 249         return 0;
 250
 251 nla_put_failure:
 252         return -1;
 253 }
 254 #else
 255 #define ctnetlink_dump_secmark(a, b) (0)
 256 #endif
 257
 258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 259
 260 static inline int
 261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 262 {
 263         struct nlattr *nest_parms;
 264
 265         if (!(ct->status & IPS_EXPECTED))
 266                 return 0;
 267
 268         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 269         if (!nest_parms)
 270                 goto nla_put_failure;
 271         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 272                 goto nla_put_failure;
 273         nla_nest_end(skb, nest_parms);
 274
 275         return 0;
 276
 277 nla_put_failure:
 278         return -1;
 279 }
 280
 281 #ifdef CONFIG_NF_NAT_NEEDED
 282 static int
 283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 284 {
 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         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 292                      htonl(natseq->correction_pos));
 293         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 294                      htonl(natseq->offset_before));
 295         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 296                      htonl(natseq->offset_after));
 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         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 333         return 0;
 334
 335 nla_put_failure:
 336         return -1;
 337 }
 338
 339 static inline int
 340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 341 {
 342         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 343         return 0;
 344
 345 nla_put_failure:
 346         return -1;
 347 }
 348
 349 static int
 350 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 351                     int event, struct nf_conn *ct)
 352 {
 353         struct nlmsghdr *nlh;
 354         struct nfgenmsg *nfmsg;
 355         struct nlattr *nest_parms;
 356         unsigned int flags = pid ? NLM_F_MULTI : 0;
 357
 358         event |= NFNL_SUBSYS_CTNETLINK << 8;
 359         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 360         if (nlh == NULL)
 361                 goto nlmsg_failure;
 362
 363         nfmsg = nlmsg_data(nlh);
 364         nfmsg->nfgen_family = nf_ct_l3num(ct);
 365         nfmsg->version      = NFNETLINK_V0;
 366         nfmsg->res_id       = 0;
 367
 368         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 369         if (!nest_parms)
 370                 goto nla_put_failure;
 371         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 372                 goto nla_put_failure;
 373         nla_nest_end(skb, nest_parms);
 374
 375         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 376         if (!nest_parms)
 377                 goto nla_put_failure;
 378         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 379                 goto nla_put_failure;
 380         nla_nest_end(skb, nest_parms);
 381
 382         if (ctnetlink_dump_status(skb, ct) < 0 ||
 383             ctnetlink_dump_timeout(skb, ct) < 0 ||
 384             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 385             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 386             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 387             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 388             ctnetlink_dump_mark(skb, ct) < 0 ||
 389             ctnetlink_dump_secmark(skb, ct) < 0 ||
 390             ctnetlink_dump_id(skb, ct) < 0 ||
 391             ctnetlink_dump_use(skb, ct) < 0 ||
 392             ctnetlink_dump_master(skb, ct) < 0 ||
 393             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 394                 goto nla_put_failure;
 395
 396         nlmsg_end(skb, nlh);
 397         return skb->len;
 398
 399 nlmsg_failure:
 400 nla_put_failure:
 401         nlmsg_cancel(skb, nlh);
 402         return -1;
 403 }
 404
 405 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 406 static inline size_t
 407 ctnetlink_proto_size(const struct nf_conn *ct)
 408 {
 409         struct nf_conntrack_l3proto *l3proto;
 410         struct nf_conntrack_l4proto *l4proto;
 411         size_t len = 0;
 412
 413         rcu_read_lock();
 414         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 415         len += l3proto->nla_size;
 416
 417         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 418         len += l4proto->nla_size;
 419         rcu_read_unlock();
 420
 421         return len;
 422 }
 423
 424 static inline size_t
 425 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 426 {
 427         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 428                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 429                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 430                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 431                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 432                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 433                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 434 #ifdef CONFIG_NF_CT_ACCT
 435                + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 436                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 437                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 438 #endif
 439                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 440                + nla_total_size(0) /* CTA_PROTOINFO */
 441                + nla_total_size(0) /* CTA_HELP */
 442                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 443 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 444                + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
 445 #endif
 446 #ifdef CONFIG_NF_NAT_NEEDED
 447                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 448                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 449 #endif
 450 #ifdef CONFIG_NF_CONNTRACK_MARK
 451                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 452 #endif
 453                + ctnetlink_proto_size(ct)
 454                ;
 455 }
 456
 457 static int
 458 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 459 {
 460         struct net *net;
 461         struct nlmsghdr *nlh;
 462         struct nfgenmsg *nfmsg;
 463         struct nlattr *nest_parms;
 464         struct nf_conn *ct = item->ct;
 465         struct sk_buff *skb;
 466         unsigned int type;
 467         unsigned int flags = 0, group;
 468         int err;
 469
 470         /* ignore our fake conntrack entry */
 471         if (ct == &nf_conntrack_untracked)
 472                 return 0;
 473
 474         if (events & (1 << IPCT_DESTROY)) {
 475                 type = IPCTNL_MSG_CT_DELETE;
 476                 group = NFNLGRP_CONNTRACK_DESTROY;
 477         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 478                 type = IPCTNL_MSG_CT_NEW;
 479                 flags = NLM_F_CREATE|NLM_F_EXCL;
 480                 group = NFNLGRP_CONNTRACK_NEW;
 481         } else  if (events) {
 482                 type = IPCTNL_MSG_CT_NEW;
 483                 group = NFNLGRP_CONNTRACK_UPDATE;
 484         } else
 485                 return 0;
 486
 487         net = nf_ct_net(ct);
 488         if (!item->report && !nfnetlink_has_listeners(net, group))
 489                 return 0;
 490
 491         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 492         if (skb == NULL)
 493                 goto errout;
 494
 495         type |= NFNL_SUBSYS_CTNETLINK << 8;
 496         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 497         if (nlh == NULL)
 498                 goto nlmsg_failure;
 499
 500         nfmsg = nlmsg_data(nlh);
 501         nfmsg->nfgen_family = nf_ct_l3num(ct);
 502         nfmsg->version  = NFNETLINK_V0;
 503         nfmsg->res_id   = 0;
 504
 505         rcu_read_lock();
 506         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 507         if (!nest_parms)
 508                 goto nla_put_failure;
 509         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 510                 goto nla_put_failure;
 511         nla_nest_end(skb, nest_parms);
 512
 513         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 514         if (!nest_parms)
 515                 goto nla_put_failure;
 516         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 517                 goto nla_put_failure;
 518         nla_nest_end(skb, nest_parms);
 519
 520         if (ctnetlink_dump_id(skb, ct) < 0)
 521                 goto nla_put_failure;
 522
 523         if (ctnetlink_dump_status(skb, ct) < 0)
 524                 goto nla_put_failure;
 525
 526         if (events & (1 << IPCT_DESTROY)) {
 527                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 528                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 529                         goto nla_put_failure;
 530         } else {
 531                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 532                         goto nla_put_failure;
 533
 534                 if (events & (1 << IPCT_PROTOINFO)
 535                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 536                         goto nla_put_failure;
 537
 538                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 539                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 540                         goto nla_put_failure;
 541
 542 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 543                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 544                     && ctnetlink_dump_secmark(skb, ct) < 0)
 545                         goto nla_put_failure;
 546 #endif
 547
 548                 if (events & (1 << IPCT_RELATED) &&
 549                     ctnetlink_dump_master(skb, ct) < 0)
 550                         goto nla_put_failure;
 551
 552                 if (events & (1 << IPCT_NATSEQADJ) &&
 553                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 554                         goto nla_put_failure;
 555         }
 556
 557 #ifdef CONFIG_NF_CONNTRACK_MARK
 558         if ((events & (1 << IPCT_MARK) || ct->mark)
 559             && ctnetlink_dump_mark(skb, ct) < 0)
 560                 goto nla_put_failure;
 561 #endif
 562         rcu_read_unlock();
 563
 564         nlmsg_end(skb, nlh);
 565         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 566                              GFP_ATOMIC);
 567         if (err == -ENOBUFS || err == -EAGAIN)
 568                 return -ENOBUFS;
 569
 570         return 0;
 571
 572 nla_put_failure:
 573         rcu_read_unlock();
 574         nlmsg_cancel(skb, nlh);
 575 nlmsg_failure:
 576         kfree_skb(skb);
 577 errout:
 578         nfnetlink_set_err(net, 0, group, -ENOBUFS);
 579         return 0;
 580 }
 581 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 582
 583 static int ctnetlink_done(struct netlink_callback *cb)
 584 {
 585         if (cb->args[1])
 586                 nf_ct_put((struct nf_conn *)cb->args[1]);
 587         return 0;
 588 }
 589
 590 static int
 591 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 592 {
 593         struct net *net = sock_net(skb->sk);
 594         struct nf_conn *ct, *last;
 595         struct nf_conntrack_tuple_hash *h;
 596         struct hlist_nulls_node *n;
 597         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 598         u_int8_t l3proto = nfmsg->nfgen_family;
 599
 600         rcu_read_lock();
 601         last = (struct nf_conn *)cb->args[1];
 602         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 603 restart:
 604                 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
 605                                          hnnode) {
 606                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 607                                 continue;
 608                         ct = nf_ct_tuplehash_to_ctrack(h);
 609                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 610                                 continue;
 611                         /* Dump entries of a given L3 protocol number.
 612                          * If it is not specified, ie. l3proto == 0,
 613                          * then dump everything. */
 614                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 615                                 goto releasect;
 616                         if (cb->args[1]) {
 617                                 if (ct != last)
 618                                         goto releasect;
 619                                 cb->args[1] = 0;
 620                         }
 621                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 622                                                 cb->nlh->nlmsg_seq,
 623                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 624                                 cb->args[1] = (unsigned long)ct;
 625                                 goto out;
 626                         }
 627
 628                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 629                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 630                                 struct nf_conn_counter *acct;
 631
 632                                 acct = nf_conn_acct_find(ct);
 633                                 if (acct)
 634                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 635                         }
 636 releasect:
 637                 nf_ct_put(ct);
 638                 }
 639                 if (cb->args[1]) {
 640                         cb->args[1] = 0;
 641                         goto restart;
 642                 }
 643         }
 644 out:
 645         rcu_read_unlock();
 646         if (last)
 647                 nf_ct_put(last);
 648
 649         return skb->len;
 650 }
 651
 652 static inline int
 653 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 654 {
 655         struct nlattr *tb[CTA_IP_MAX+1];
 656         struct nf_conntrack_l3proto *l3proto;
 657         int ret = 0;
 658
 659         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 660
 661         rcu_read_lock();
 662         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 663
 664         if (likely(l3proto->nlattr_to_tuple)) {
 665                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 666                                           l3proto->nla_policy);
 667                 if (ret == 0)
 668                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 669         }
 670
 671         rcu_read_unlock();
 672
 673         return ret;
 674 }
 675
 676 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 677         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 678 };
 679
 680 static inline int
 681 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 682                             struct nf_conntrack_tuple *tuple)
 683 {
 684         struct nlattr *tb[CTA_PROTO_MAX+1];
 685         struct nf_conntrack_l4proto *l4proto;
 686         int ret = 0;
 687
 688         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 689         if (ret < 0)
 690                 return ret;
 691
 692         if (!tb[CTA_PROTO_NUM])
 693                 return -EINVAL;
 694         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 695
 696         rcu_read_lock();
 697         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 698
 699         if (likely(l4proto->nlattr_to_tuple)) {
 700                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 701                                           l4proto->nla_policy);
 702                 if (ret == 0)
 703                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 704         }
 705
 706         rcu_read_unlock();
 707
 708         return ret;
 709 }
 710
 711 static int
 712 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 713                       struct nf_conntrack_tuple *tuple,
 714                       enum ctattr_tuple type, u_int8_t l3num)
 715 {
 716         struct nlattr *tb[CTA_TUPLE_MAX+1];
 717         int err;
 718
 719         memset(tuple, 0, sizeof(*tuple));
 720
 721         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 722
 723         if (!tb[CTA_TUPLE_IP])
 724                 return -EINVAL;
 725
 726         tuple->src.l3num = l3num;
 727
 728         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 729         if (err < 0)
 730                 return err;
 731
 732         if (!tb[CTA_TUPLE_PROTO])
 733                 return -EINVAL;
 734
 735         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 736         if (err < 0)
 737                 return err;
 738
 739         /* orig and expect tuples get DIR_ORIGINAL */
 740         if (type == CTA_TUPLE_REPLY)
 741                 tuple->dst.dir = IP_CT_DIR_REPLY;
 742         else
 743                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 744
 745         return 0;
 746 }
 747
 748 static inline int
 749 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 750 {
 751         struct nlattr *tb[CTA_HELP_MAX+1];
 752
 753         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 754
 755         if (!tb[CTA_HELP_NAME])
 756                 return -EINVAL;
 757
 758         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 759
 760         return 0;
 761 }
 762
 763 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 764         [CTA_STATUS]            = { .type = NLA_U32 },
 765         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 766         [CTA_MARK]              = { .type = NLA_U32 },
 767         [CTA_USE]               = { .type = NLA_U32 },
 768         [CTA_ID]                = { .type = NLA_U32 },
 769 };
 770
 771 static int
 772 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 773                         const struct nlmsghdr *nlh,
 774                         const struct nlattr * const cda[])
 775 {
 776         struct net *net = sock_net(ctnl);
 777         struct nf_conntrack_tuple_hash *h;
 778         struct nf_conntrack_tuple tuple;
 779         struct nf_conn *ct;
 780         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 781         u_int8_t u3 = nfmsg->nfgen_family;
 782         int err = 0;
 783
 784         if (cda[CTA_TUPLE_ORIG])
 785                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 786         else if (cda[CTA_TUPLE_REPLY])
 787                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 788         else {
 789                 /* Flush the whole table */
 790                 nf_conntrack_flush_report(net,
 791                                          NETLINK_CB(skb).pid,
 792                                          nlmsg_report(nlh));
 793                 return 0;
 794         }
 795
 796         if (err < 0)
 797                 return err;
 798
 799         h = nf_conntrack_find_get(net, &tuple);
 800         if (!h)
 801                 return -ENOENT;
 802
 803         ct = nf_ct_tuplehash_to_ctrack(h);
 804
 805         if (cda[CTA_ID]) {
 806                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 807                 if (id != (u32)(unsigned long)ct) {
 808                         nf_ct_put(ct);
 809                         return -ENOENT;
 810                 }
 811         }
 812
 813         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 814                                       NETLINK_CB(skb).pid,
 815                                       nlmsg_report(nlh)) < 0) {
 816                 nf_ct_delete_from_lists(ct);
 817                 /* we failed to report the event, try later */
 818                 nf_ct_insert_dying_list(ct);
 819                 nf_ct_put(ct);
 820                 return 0;
 821         }
 822
 823         /* death_by_timeout would report the event again */
 824         set_bit(IPS_DYING_BIT, &ct->status);
 825
 826         nf_ct_kill(ct);
 827         nf_ct_put(ct);
 828
 829         return 0;
 830 }
 831
 832 static int
 833 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 834                         const struct nlmsghdr *nlh,
 835                         const struct nlattr * const cda[])
 836 {
 837         struct net *net = sock_net(ctnl);
 838         struct nf_conntrack_tuple_hash *h;
 839         struct nf_conntrack_tuple tuple;
 840         struct nf_conn *ct;
 841         struct sk_buff *skb2 = NULL;
 842         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 843         u_int8_t u3 = nfmsg->nfgen_family;
 844         int err = 0;
 845
 846         if (nlh->nlmsg_flags & NLM_F_DUMP)
 847                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 848                                           ctnetlink_done);
 849
 850         if (cda[CTA_TUPLE_ORIG])
 851                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 852         else if (cda[CTA_TUPLE_REPLY])
 853                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 854         else
 855                 return -EINVAL;
 856
 857         if (err < 0)
 858                 return err;
 859
 860         h = nf_conntrack_find_get(net, &tuple);
 861         if (!h)
 862                 return -ENOENT;
 863
 864         ct = nf_ct_tuplehash_to_ctrack(h);
 865
 866         err = -ENOMEM;
 867         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 868         if (skb2 == NULL) {
 869                 nf_ct_put(ct);
 870                 return -ENOMEM;
 871         }
 872
 873         rcu_read_lock();
 874         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 875                                   IPCTNL_MSG_CT_NEW, ct);
 876         rcu_read_unlock();
 877         nf_ct_put(ct);
 878         if (err <= 0)
 879                 goto free;
 880
 881         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 882         if (err < 0)
 883                 goto out;
 884
 885         return 0;
 886
 887 free:
 888         kfree_skb(skb2);
 889 out:
 890         return err;
 891 }
 892
 893 #ifdef CONFIG_NF_NAT_NEEDED
 894 static int
 895 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 896                           enum nf_nat_manip_type manip,
 897                           const struct nlattr *attr)
 898 {
 899         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 900
 901         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 902         if (!parse_nat_setup) {
 903 #ifdef CONFIG_MODULES
 904                 rcu_read_unlock();
 905                 spin_unlock_bh(&nf_conntrack_lock);
 906                 nfnl_unlock();
 907                 if (request_module("nf-nat-ipv4") < 0) {
 908                         nfnl_lock();
 909                         spin_lock_bh(&nf_conntrack_lock);
 910                         rcu_read_lock();
 911                         return -EOPNOTSUPP;
 912                 }
 913                 nfnl_lock();
 914                 spin_lock_bh(&nf_conntrack_lock);
 915                 rcu_read_lock();
 916                 if (nfnetlink_parse_nat_setup_hook)
 917                         return -EAGAIN;
 918 #endif
 919                 return -EOPNOTSUPP;
 920         }
 921
 922         return parse_nat_setup(ct, manip, attr);
 923 }
 924 #endif
 925
 926 static int
 927 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
 928 {
 929         unsigned long d;
 930         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 931         d = ct->status ^ status;
 932
 933         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 934                 /* unchangeable */
 935                 return -EBUSY;
 936
 937         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 938                 /* SEEN_REPLY bit can only be set */
 939                 return -EBUSY;
 940
 941         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 942                 /* ASSURED bit can only be set */
 943                 return -EBUSY;
 944
 945         /* Be careful here, modifying NAT bits can screw up things,
 946          * so don't let users modify them directly if they don't pass
 947          * nf_nat_range. */
 948         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 949         return 0;
 950 }
 951
 952 static int
 953 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
 954 {
 955 #ifdef CONFIG_NF_NAT_NEEDED
 956         int ret;
 957
 958         if (cda[CTA_NAT_DST]) {
 959                 ret = ctnetlink_parse_nat_setup(ct,
 960                                                 IP_NAT_MANIP_DST,
 961                                                 cda[CTA_NAT_DST]);
 962                 if (ret < 0)
 963                         return ret;
 964         }
 965         if (cda[CTA_NAT_SRC]) {
 966                 ret = ctnetlink_parse_nat_setup(ct,
 967                                                 IP_NAT_MANIP_SRC,
 968                                                 cda[CTA_NAT_SRC]);
 969                 if (ret < 0)
 970                         return ret;
 971         }
 972         return 0;
 973 #else
 974         return -EOPNOTSUPP;
 975 #endif
 976 }
 977
 978 static inline int
 979 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
 980 {
 981         struct nf_conntrack_helper *helper;
 982         struct nf_conn_help *help = nfct_help(ct);
 983         char *helpname = NULL;
 984         int err;
 985
 986         /* don't change helper of sibling connections */
 987         if (ct->master)
 988                 return -EBUSY;
 989
 990         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 991         if (err < 0)
 992                 return err;
 993
 994         if (!strcmp(helpname, "")) {
 995                 if (help && help->helper) {
 996                         /* we had a helper before ... */
 997                         nf_ct_remove_expectations(ct);
 998                         rcu_assign_pointer(help->helper, NULL);
 999                 }
1000
1001                 return 0;
1002         }
1003
1004         helper = __nf_conntrack_helper_find_byname(helpname);
1005         if (helper == NULL) {
1006 #ifdef CONFIG_MODULES
1007                 spin_unlock_bh(&nf_conntrack_lock);
1008
1009                 if (request_module("nfct-helper-%s", helpname) < 0) {
1010                         spin_lock_bh(&nf_conntrack_lock);
1011                         return -EOPNOTSUPP;
1012                 }
1013
1014                 spin_lock_bh(&nf_conntrack_lock);
1015                 helper = __nf_conntrack_helper_find_byname(helpname);
1016                 if (helper)
1017                         return -EAGAIN;
1018 #endif
1019                 return -EOPNOTSUPP;
1020         }
1021
1022         if (help) {
1023                 if (help->helper == helper)
1024                         return 0;
1025                 if (help->helper)
1026                         return -EBUSY;
1027                 /* need to zero data of old helper */
1028                 memset(&help->help, 0, sizeof(help->help));
1029         } else {
1030                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1031                 if (help == NULL)
1032                         return -ENOMEM;
1033         }
1034
1035         rcu_assign_pointer(help->helper, helper);
1036
1037         return 0;
1038 }
1039
1040 static inline int
1041 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1042 {
1043         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1044
1045         if (!del_timer(&ct->timeout))
1046                 return -ETIME;
1047
1048         ct->timeout.expires = jiffies + timeout * HZ;
1049         add_timer(&ct->timeout);
1050
1051         return 0;
1052 }
1053
1054 static inline int
1055 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1056 {
1057         const struct nlattr *attr = cda[CTA_PROTOINFO];
1058         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1059         struct nf_conntrack_l4proto *l4proto;
1060         int err = 0;
1061
1062         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1063
1064         rcu_read_lock();
1065         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1066         if (l4proto->from_nlattr)
1067                 err = l4proto->from_nlattr(tb, ct);
1068         rcu_read_unlock();
1069
1070         return err;
1071 }
1072
1073 #ifdef CONFIG_NF_NAT_NEEDED
1074 static inline int
1075 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1076 {
1077         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1078
1079         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1080
1081         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1082                 return -EINVAL;
1083
1084         natseq->correction_pos =
1085                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1086
1087         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1088                 return -EINVAL;
1089
1090         natseq->offset_before =
1091                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1092
1093         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1094                 return -EINVAL;
1095
1096         natseq->offset_after =
1097                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1098
1099         return 0;
1100 }
1101
1102 static int
1103 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1104                              const struct nlattr * const cda[])
1105 {
1106         int ret = 0;
1107         struct nf_conn_nat *nat = nfct_nat(ct);
1108
1109         if (!nat)
1110                 return 0;
1111
1112         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1113                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1114                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1115                 if (ret < 0)
1116                         return ret;
1117
1118                 ct->status |= IPS_SEQ_ADJUST;
1119         }
1120
1121         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1122                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1123                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1124                 if (ret < 0)
1125                         return ret;
1126
1127                 ct->status |= IPS_SEQ_ADJUST;
1128         }
1129
1130         return 0;
1131 }
1132 #endif
1133
1134 static int
1135 ctnetlink_change_conntrack(struct nf_conn *ct,
1136                            const struct nlattr * const cda[])
1137 {
1138         int err;
1139
1140         /* only allow NAT changes and master assignation for new conntracks */
1141         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1142                 return -EOPNOTSUPP;
1143
1144         if (cda[CTA_HELP]) {
1145                 err = ctnetlink_change_helper(ct, cda);
1146                 if (err < 0)
1147                         return err;
1148         }
1149
1150         if (cda[CTA_TIMEOUT]) {
1151                 err = ctnetlink_change_timeout(ct, cda);
1152                 if (err < 0)
1153                         return err;
1154         }
1155
1156         if (cda[CTA_STATUS]) {
1157                 err = ctnetlink_change_status(ct, cda);
1158                 if (err < 0)
1159                         return err;
1160         }
1161
1162         if (cda[CTA_PROTOINFO]) {
1163                 err = ctnetlink_change_protoinfo(ct, cda);
1164                 if (err < 0)
1165                         return err;
1166         }
1167
1168 #if defined(CONFIG_NF_CONNTRACK_MARK)
1169         if (cda[CTA_MARK])
1170                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1171 #endif
1172
1173 #ifdef CONFIG_NF_NAT_NEEDED
1174         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1175                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1176                 if (err < 0)
1177                         return err;
1178         }
1179 #endif
1180
1181         return 0;
1182 }
1183
1184 static struct nf_conn *
1185 ctnetlink_create_conntrack(struct net *net,
1186                            const struct nlattr * const cda[],
1187                            struct nf_conntrack_tuple *otuple,
1188                            struct nf_conntrack_tuple *rtuple,
1189                            u8 u3)
1190 {
1191         struct nf_conn *ct;
1192         int err = -EINVAL;
1193         struct nf_conntrack_helper *helper;
1194
1195         ct = nf_conntrack_alloc(net, otuple, rtuple, GFP_ATOMIC);
1196         if (IS_ERR(ct))
1197                 return ERR_PTR(-ENOMEM);
1198
1199         if (!cda[CTA_TIMEOUT])
1200                 goto err1;
1201         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1202
1203         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1204         ct->status |= IPS_CONFIRMED;
1205
1206         rcu_read_lock();
1207         if (cda[CTA_HELP]) {
1208                 char *helpname = NULL;
1209
1210                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1211                 if (err < 0)
1212                         goto err2;
1213
1214                 helper = __nf_conntrack_helper_find_byname(helpname);
1215                 if (helper == NULL) {
1216                         rcu_read_unlock();
1217 #ifdef CONFIG_MODULES
1218                         if (request_module("nfct-helper-%s", helpname) < 0) {
1219                                 err = -EOPNOTSUPP;
1220                                 goto err1;
1221                         }
1222
1223                         rcu_read_lock();
1224                         helper = __nf_conntrack_helper_find_byname(helpname);
1225                         if (helper) {
1226                                 err = -EAGAIN;
1227                                 goto err2;
1228                         }
1229                         rcu_read_unlock();
1230 #endif
1231                         err = -EOPNOTSUPP;
1232                         goto err1;
1233                 } else {
1234                         struct nf_conn_help *help;
1235
1236                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1237                         if (help == NULL) {
1238                                 err = -ENOMEM;
1239                                 goto err2;
1240                         }
1241
1242                         /* not in hash table yet so not strictly necessary */
1243                         rcu_assign_pointer(help->helper, helper);
1244                 }
1245         } else {
1246                 /* try an implicit helper assignation */
1247                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1248                 if (err < 0)
1249                         goto err2;
1250         }
1251
1252         if (cda[CTA_STATUS]) {
1253                 err = ctnetlink_change_status(ct, cda);
1254                 if (err < 0)
1255                         goto err2;
1256         }
1257
1258         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1259                 err = ctnetlink_change_nat(ct, cda);
1260                 if (err < 0)
1261                         goto err2;
1262         }
1263
1264 #ifdef CONFIG_NF_NAT_NEEDED
1265         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1266                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1267                 if (err < 0)
1268                         goto err2;
1269         }
1270 #endif
1271
1272         if (cda[CTA_PROTOINFO]) {
1273                 err = ctnetlink_change_protoinfo(ct, cda);
1274                 if (err < 0)
1275                         goto err2;
1276         }
1277
1278         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1279         nf_ct_ecache_ext_add(ct, GFP_ATOMIC);
1280
1281 #if defined(CONFIG_NF_CONNTRACK_MARK)
1282         if (cda[CTA_MARK])
1283                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1284 #endif
1285
1286         /* setup master conntrack: this is a confirmed expectation */
1287         if (cda[CTA_TUPLE_MASTER]) {
1288                 struct nf_conntrack_tuple master;
1289                 struct nf_conntrack_tuple_hash *master_h;
1290                 struct nf_conn *master_ct;
1291
1292                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1293                 if (err < 0)
1294                         goto err2;
1295
1296                 master_h = nf_conntrack_find_get(net, &master);
1297                 if (master_h == NULL) {
1298                         err = -ENOENT;
1299                         goto err2;
1300                 }
1301                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1302                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1303                 ct->master = master_ct;
1304         }
1305
1306         add_timer(&ct->timeout);
1307         nf_conntrack_hash_insert(ct);
1308         rcu_read_unlock();
1309
1310         return ct;
1311
1312 err2:
1313         rcu_read_unlock();
1314 err1:
1315         nf_conntrack_free(ct);
1316         return ERR_PTR(err);
1317 }
1318
1319 static int
1320 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1321                         const struct nlmsghdr *nlh,
1322                         const struct nlattr * const cda[])
1323 {
1324         struct net *net = sock_net(ctnl);
1325         struct nf_conntrack_tuple otuple, rtuple;
1326         struct nf_conntrack_tuple_hash *h = NULL;
1327         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1328         u_int8_t u3 = nfmsg->nfgen_family;
1329         int err = 0;
1330
1331         if (cda[CTA_TUPLE_ORIG]) {
1332                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1333                 if (err < 0)
1334                         return err;
1335         }
1336
1337         if (cda[CTA_TUPLE_REPLY]) {
1338                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1339                 if (err < 0)
1340                         return err;
1341         }
1342
1343         spin_lock_bh(&nf_conntrack_lock);
1344         if (cda[CTA_TUPLE_ORIG])
1345                 h = __nf_conntrack_find(net, &otuple);
1346         else if (cda[CTA_TUPLE_REPLY])
1347                 h = __nf_conntrack_find(net, &rtuple);
1348
1349         if (h == NULL) {
1350                 err = -ENOENT;
1351                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1352                         struct nf_conn *ct;
1353                         enum ip_conntrack_events events;
1354
1355                         ct = ctnetlink_create_conntrack(net, cda, &otuple,
1356                                                         &rtuple, u3);
1357                         if (IS_ERR(ct)) {
1358                                 err = PTR_ERR(ct);
1359                                 goto out_unlock;
1360                         }
1361                         err = 0;
1362                         nf_conntrack_get(&ct->ct_general);
1363                         spin_unlock_bh(&nf_conntrack_lock);
1364                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1365                                 events = IPCT_RELATED;
1366                         else
1367                                 events = IPCT_NEW;
1368
1369                         nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1370                                                       (1 << IPCT_HELPER) |
1371                                                       (1 << IPCT_PROTOINFO) |
1372                                                       (1 << IPCT_NATSEQADJ) |
1373                                                       (1 << IPCT_MARK) | events,
1374                                                       ct, NETLINK_CB(skb).pid,
1375                                                       nlmsg_report(nlh));
1376                         nf_ct_put(ct);
1377                 } else
1378                         spin_unlock_bh(&nf_conntrack_lock);
1379
1380                 return err;
1381         }
1382         /* implicit 'else' */
1383
1384         /* We manipulate the conntrack inside the global conntrack table lock,
1385          * so there's no need to increase the refcount */
1386         err = -EEXIST;
1387         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1388                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1389
1390                 err = ctnetlink_change_conntrack(ct, cda);
1391                 if (err == 0) {
1392                         nf_conntrack_get(&ct->ct_general);
1393                         spin_unlock_bh(&nf_conntrack_lock);
1394                         nf_conntrack_eventmask_report((1 << IPCT_STATUS) |
1395                                                       (1 << IPCT_HELPER) |
1396                                                       (1 << IPCT_PROTOINFO) |
1397                                                       (1 << IPCT_NATSEQADJ) |
1398                                                       (1 << IPCT_MARK),
1399                                                       ct, NETLINK_CB(skb).pid,
1400                                                       nlmsg_report(nlh));
1401                         nf_ct_put(ct);
1402                 } else
1403                         spin_unlock_bh(&nf_conntrack_lock);
1404
1405                 return err;
1406         }
1407
1408 out_unlock:
1409         spin_unlock_bh(&nf_conntrack_lock);
1410         return err;
1411 }
1412
1413 /***********************************************************************
1414  * EXPECT
1415  ***********************************************************************/
1416
1417 static inline int
1418 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1419                          const struct nf_conntrack_tuple *tuple,
1420                          enum ctattr_expect type)
1421 {
1422         struct nlattr *nest_parms;
1423
1424         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1425         if (!nest_parms)
1426                 goto nla_put_failure;
1427         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1428                 goto nla_put_failure;
1429         nla_nest_end(skb, nest_parms);
1430
1431         return 0;
1432
1433 nla_put_failure:
1434         return -1;
1435 }
1436
1437 static inline int
1438 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1439                         const struct nf_conntrack_tuple *tuple,
1440                         const struct nf_conntrack_tuple_mask *mask)
1441 {
1442         int ret;
1443         struct nf_conntrack_l3proto *l3proto;
1444         struct nf_conntrack_l4proto *l4proto;
1445         struct nf_conntrack_tuple m;
1446         struct nlattr *nest_parms;
1447
1448         memset(&m, 0xFF, sizeof(m));
1449         m.src.u.all = mask->src.u.all;
1450         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1451
1452         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1453         if (!nest_parms)
1454                 goto nla_put_failure;
1455
1456         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1457         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1458
1459         if (unlikely(ret < 0))
1460                 goto nla_put_failure;
1461
1462         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1463         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1464         if (unlikely(ret < 0))
1465                 goto nla_put_failure;
1466
1467         nla_nest_end(skb, nest_parms);
1468
1469         return 0;
1470
1471 nla_put_failure:
1472         return -1;
1473 }
1474
1475 static int
1476 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1477                           const struct nf_conntrack_expect *exp)
1478 {
1479         struct nf_conn *master = exp->master;
1480         long timeout = (exp->timeout.expires - jiffies) / HZ;
1481
1482         if (timeout < 0)
1483                 timeout = 0;
1484
1485         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1486                 goto nla_put_failure;
1487         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1488                 goto nla_put_failure;
1489         if (ctnetlink_exp_dump_tuple(skb,
1490                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1491                                  CTA_EXPECT_MASTER) < 0)
1492                 goto nla_put_failure;
1493
1494         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1495         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1496
1497         return 0;
1498
1499 nla_put_failure:
1500         return -1;
1501 }
1502
1503 static int
1504 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1505                         int event, const struct nf_conntrack_expect *exp)
1506 {
1507         struct nlmsghdr *nlh;
1508         struct nfgenmsg *nfmsg;
1509         unsigned int flags = pid ? NLM_F_MULTI : 0;
1510
1511         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1512         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1513         if (nlh == NULL)
1514                 goto nlmsg_failure;
1515
1516         nfmsg = nlmsg_data(nlh);
1517         nfmsg->nfgen_family = exp->tuple.src.l3num;
1518         nfmsg->version      = NFNETLINK_V0;
1519         nfmsg->res_id       = 0;
1520
1521         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1522                 goto nla_put_failure;
1523
1524         nlmsg_end(skb, nlh);
1525         return skb->len;
1526
1527 nlmsg_failure:
1528 nla_put_failure:
1529         nlmsg_cancel(skb, nlh);
1530         return -1;
1531 }
1532
1533 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1534 static int
1535 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1536 {
1537         struct nf_conntrack_expect *exp = item->exp;
1538         struct net *net = nf_ct_exp_net(exp);
1539         struct nlmsghdr *nlh;
1540         struct nfgenmsg *nfmsg;
1541         struct sk_buff *skb;
1542         unsigned int type;
1543         int flags = 0;
1544
1545         if (events & (1 << IPEXP_NEW)) {
1546                 type = IPCTNL_MSG_EXP_NEW;
1547                 flags = NLM_F_CREATE|NLM_F_EXCL;
1548         } else
1549                 return 0;
1550
1551         if (!item->report &&
1552             !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1553                 return 0;
1554
1555         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1556         if (skb == NULL)
1557                 goto errout;
1558
1559         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1560         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1561         if (nlh == NULL)
1562                 goto nlmsg_failure;
1563
1564         nfmsg = nlmsg_data(nlh);
1565         nfmsg->nfgen_family = exp->tuple.src.l3num;
1566         nfmsg->version      = NFNETLINK_V0;
1567         nfmsg->res_id       = 0;
1568
1569         rcu_read_lock();
1570         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1571                 goto nla_put_failure;
1572         rcu_read_unlock();
1573
1574         nlmsg_end(skb, nlh);
1575         nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1576                        item->report, GFP_ATOMIC);
1577         return 0;
1578
1579 nla_put_failure:
1580         rcu_read_unlock();
1581         nlmsg_cancel(skb, nlh);
1582 nlmsg_failure:
1583         kfree_skb(skb);
1584 errout:
1585         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1586         return 0;
1587 }
1588 #endif
1589 static int ctnetlink_exp_done(struct netlink_callback *cb)
1590 {
1591         if (cb->args[1])
1592                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1593         return 0;
1594 }
1595
1596 static int
1597 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1598 {
1599         struct net *net = sock_net(skb->sk);
1600         struct nf_conntrack_expect *exp, *last;
1601         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1602         struct hlist_node *n;
1603         u_int8_t l3proto = nfmsg->nfgen_family;
1604
1605         rcu_read_lock();
1606         last = (struct nf_conntrack_expect *)cb->args[1];
1607         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1608 restart:
1609                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1610                                      hnode) {
1611                         if (l3proto && exp->tuple.src.l3num != l3proto)
1612                                 continue;
1613                         if (cb->args[1]) {
1614                                 if (exp != last)
1615                                         continue;
1616                                 cb->args[1] = 0;
1617                         }
1618                         if (ctnetlink_exp_fill_info(skb,
1619                                                     NETLINK_CB(cb->skb).pid,
1620                                                     cb->nlh->nlmsg_seq,
1621                                                     IPCTNL_MSG_EXP_NEW,
1622                                                     exp) < 0) {
1623                                 if (!atomic_inc_not_zero(&exp->use))
1624                                         continue;
1625                                 cb->args[1] = (unsigned long)exp;
1626                                 goto out;
1627                         }
1628                 }
1629                 if (cb->args[1]) {
1630                         cb->args[1] = 0;
1631                         goto restart;
1632                 }
1633         }
1634 out:
1635         rcu_read_unlock();
1636         if (last)
1637                 nf_ct_expect_put(last);
1638
1639         return skb->len;
1640 }
1641
1642 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1643         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1644         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1645 };
1646
1647 static int
1648 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1649                      const struct nlmsghdr *nlh,
1650                      const struct nlattr * const cda[])
1651 {
1652         struct net *net = sock_net(ctnl);
1653         struct nf_conntrack_tuple tuple;
1654         struct nf_conntrack_expect *exp;
1655         struct sk_buff *skb2;
1656         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1657         u_int8_t u3 = nfmsg->nfgen_family;
1658         int err = 0;
1659
1660         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1661                 return netlink_dump_start(ctnl, skb, nlh,
1662                                           ctnetlink_exp_dump_table,
1663                                           ctnetlink_exp_done);
1664         }
1665
1666         if (cda[CTA_EXPECT_MASTER])
1667                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1668         else
1669                 return -EINVAL;
1670
1671         if (err < 0)
1672                 return err;
1673
1674         exp = nf_ct_expect_find_get(net, &tuple);
1675         if (!exp)
1676                 return -ENOENT;
1677
1678         if (cda[CTA_EXPECT_ID]) {
1679                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1680                 if (ntohl(id) != (u32)(unsigned long)exp) {
1681                         nf_ct_expect_put(exp);
1682                         return -ENOENT;
1683                 }
1684         }
1685
1686         err = -ENOMEM;
1687         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688         if (skb2 == NULL)
1689                 goto out;
1690
1691         rcu_read_lock();
1692         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1693                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1694         rcu_read_unlock();
1695         if (err <= 0)
1696                 goto free;
1697
1698         nf_ct_expect_put(exp);
1699
1700         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1701
1702 free:
1703         kfree_skb(skb2);
1704 out:
1705         nf_ct_expect_put(exp);
1706         return err;
1707 }
1708
1709 static int
1710 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1711                      const struct nlmsghdr *nlh,
1712                      const struct nlattr * const cda[])
1713 {
1714         struct net *net = sock_net(ctnl);
1715         struct nf_conntrack_expect *exp;
1716         struct nf_conntrack_tuple tuple;
1717         struct nf_conntrack_helper *h;
1718         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1719         struct hlist_node *n, *next;
1720         u_int8_t u3 = nfmsg->nfgen_family;
1721         unsigned int i;
1722         int err;
1723
1724         if (cda[CTA_EXPECT_TUPLE]) {
1725                 /* delete a single expect by tuple */
1726                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1727                 if (err < 0)
1728                         return err;
1729
1730                 /* bump usage count to 2 */
1731                 exp = nf_ct_expect_find_get(net, &tuple);
1732                 if (!exp)
1733                         return -ENOENT;
1734
1735                 if (cda[CTA_EXPECT_ID]) {
1736                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1737                         if (ntohl(id) != (u32)(unsigned long)exp) {
1738                                 nf_ct_expect_put(exp);
1739                                 return -ENOENT;
1740                         }
1741                 }
1742
1743                 /* after list removal, usage count == 1 */
1744                 nf_ct_unexpect_related(exp);
1745                 /* have to put what we 'get' above.
1746                  * after this line usage count == 0 */
1747                 nf_ct_expect_put(exp);
1748         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1749                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1750                 struct nf_conn_help *m_help;
1751
1752                 /* delete all expectations for this helper */
1753                 spin_lock_bh(&nf_conntrack_lock);
1754                 h = __nf_conntrack_helper_find_byname(name);
1755                 if (!h) {
1756                         spin_unlock_bh(&nf_conntrack_lock);
1757                         return -EOPNOTSUPP;
1758                 }
1759                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1760                         hlist_for_each_entry_safe(exp, n, next,
1761                                                   &net->ct.expect_hash[i],
1762                                                   hnode) {
1763                                 m_help = nfct_help(exp->master);
1764                                 if (m_help->helper == h
1765                                     && del_timer(&exp->timeout)) {
1766                                         nf_ct_unlink_expect(exp);
1767                                         nf_ct_expect_put(exp);
1768                                 }
1769                         }
1770                 }
1771                 spin_unlock_bh(&nf_conntrack_lock);
1772         } else {
1773                 /* This basically means we have to flush everything*/
1774                 spin_lock_bh(&nf_conntrack_lock);
1775                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1776                         hlist_for_each_entry_safe(exp, n, next,
1777                                                   &net->ct.expect_hash[i],
1778                                                   hnode) {
1779                                 if (del_timer(&exp->timeout)) {
1780                                         nf_ct_unlink_expect(exp);
1781                                         nf_ct_expect_put(exp);
1782                                 }
1783                         }
1784                 }
1785                 spin_unlock_bh(&nf_conntrack_lock);
1786         }
1787
1788         return 0;
1789 }
1790 static int
1791 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1792                         const struct nlattr * const cda[])
1793 {
1794         return -EOPNOTSUPP;
1795 }
1796
1797 static int
1798 ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
1799                         u_int8_t u3,
1800                         u32 pid, int report)
1801 {
1802         struct nf_conntrack_tuple tuple, mask, master_tuple;
1803         struct nf_conntrack_tuple_hash *h = NULL;
1804         struct nf_conntrack_expect *exp;
1805         struct nf_conn *ct;
1806         struct nf_conn_help *help;
1807         int err = 0;
1808
1809         /* caller guarantees that those three CTA_EXPECT_* exist */
1810         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1811         if (err < 0)
1812                 return err;
1813         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1814         if (err < 0)
1815                 return err;
1816         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1817         if (err < 0)
1818                 return err;
1819
1820         /* Look for master conntrack of this expectation */
1821         h = nf_conntrack_find_get(net, &master_tuple);
1822         if (!h)
1823                 return -ENOENT;
1824         ct = nf_ct_tuplehash_to_ctrack(h);
1825         help = nfct_help(ct);
1826
1827         if (!help || !help->helper) {
1828                 /* such conntrack hasn't got any helper, abort */
1829                 err = -EOPNOTSUPP;
1830                 goto out;
1831         }
1832
1833         exp = nf_ct_expect_alloc(ct);
1834         if (!exp) {
1835                 err = -ENOMEM;
1836                 goto out;
1837         }
1838
1839         exp->class = 0;
1840         exp->expectfn = NULL;
1841         exp->flags = 0;
1842         exp->master = ct;
1843         exp->helper = NULL;
1844         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1845         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1846         exp->mask.src.u.all = mask.src.u.all;
1847
1848         err = nf_ct_expect_related_report(exp, pid, report);
1849         nf_ct_expect_put(exp);
1850
1851 out:
1852         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1853         return err;
1854 }
1855
1856 static int
1857 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1858                      const struct nlmsghdr *nlh,
1859                      const struct nlattr * const cda[])
1860 {
1861         struct net *net = sock_net(ctnl);
1862         struct nf_conntrack_tuple tuple;
1863         struct nf_conntrack_expect *exp;
1864         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1865         u_int8_t u3 = nfmsg->nfgen_family;
1866         int err = 0;
1867
1868         if (!cda[CTA_EXPECT_TUPLE]
1869             || !cda[CTA_EXPECT_MASK]
1870             || !cda[CTA_EXPECT_MASTER])
1871                 return -EINVAL;
1872
1873         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1874         if (err < 0)
1875                 return err;
1876
1877         spin_lock_bh(&nf_conntrack_lock);
1878         exp = __nf_ct_expect_find(net, &tuple);
1879
1880         if (!exp) {
1881                 spin_unlock_bh(&nf_conntrack_lock);
1882                 err = -ENOENT;
1883                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1884                         err = ctnetlink_create_expect(net, cda,
1885                                                       u3,
1886                                                       NETLINK_CB(skb).pid,
1887                                                       nlmsg_report(nlh));
1888                 }
1889                 return err;
1890         }
1891
1892         err = -EEXIST;
1893         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1894                 err = ctnetlink_change_expect(exp, cda);
1895         spin_unlock_bh(&nf_conntrack_lock);
1896
1897         return err;
1898 }
1899
1900 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1901 static struct nf_ct_event_notifier ctnl_notifier = {
1902         .fcn = ctnetlink_conntrack_event,
1903 };
1904
1905 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1906         .fcn = ctnetlink_expect_event,
1907 };
1908 #endif
1909
1910 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1911         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1912                                             .attr_count = CTA_MAX,
1913                                             .policy = ct_nla_policy },
1914         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1915                                             .attr_count = CTA_MAX,
1916                                             .policy = ct_nla_policy },
1917         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1918                                             .attr_count = CTA_MAX,
1919                                             .policy = ct_nla_policy },
1920         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1921                                             .attr_count = CTA_MAX,
1922                                             .policy = ct_nla_policy },
1923 };
1924
1925 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1926         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1927                                             .attr_count = CTA_EXPECT_MAX,
1928                                             .policy = exp_nla_policy },
1929         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1930                                             .attr_count = CTA_EXPECT_MAX,
1931                                             .policy = exp_nla_policy },
1932         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1933                                             .attr_count = CTA_EXPECT_MAX,
1934                                             .policy = exp_nla_policy },
1935 };
1936
1937 static const struct nfnetlink_subsystem ctnl_subsys = {
1938         .name                           = "conntrack",
1939         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1940         .cb_count                       = IPCTNL_MSG_MAX,
1941         .cb                             = ctnl_cb,
1942 };
1943
1944 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1945         .name                           = "conntrack_expect",
1946         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1947         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1948         .cb                             = ctnl_exp_cb,
1949 };
1950
1951 MODULE_ALIAS("ip_conntrack_netlink");
1952 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1953 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1954
1955 static int __init ctnetlink_init(void)
1956 {
1957         int ret;
1958
1959         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1960         ret = nfnetlink_subsys_register(&ctnl_subsys);
1961         if (ret < 0) {
1962                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1963                 goto err_out;
1964         }
1965
1966         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1967         if (ret < 0) {
1968                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1969                 goto err_unreg_subsys;
1970         }
1971
1972 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1973         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1974         if (ret < 0) {
1975                 printk("ctnetlink_init: cannot register notifier.\n");
1976                 goto err_unreg_exp_subsys;
1977         }
1978
1979         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1980         if (ret < 0) {
1981                 printk("ctnetlink_init: cannot expect register notifier.\n");
1982                 goto err_unreg_notifier;
1983         }
1984 #endif
1985
1986         return 0;
1987
1988 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1989 err_unreg_notifier:
1990         nf_conntrack_unregister_notifier(&ctnl_notifier);
1991 err_unreg_exp_subsys:
1992         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1993 #endif
1994 err_unreg_subsys:
1995         nfnetlink_subsys_unregister(&ctnl_subsys);
1996 err_out:
1997         return ret;
1998 }
1999
2000 static void __exit ctnetlink_exit(void)
2001 {
2002         printk("ctnetlink: unregistering from nfnetlink.\n");
2003
2004 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2005         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2006         nf_conntrack_unregister_notifier(&ctnl_notifier);
2007 #endif
2008
2009         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2010         nfnetlink_subsys_unregister(&ctnl_subsys);
2011         return;
2012 }
2013
2014 module_init(ctnetlink_init);
2015 module_exit(ctnetlink_exit);