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 #include <linux/slab.h>
  31
  32 #include <linux/netfilter.h>
  33 #include <net/netlink.h>
  34 #include <net/sock.h>
  35 #include <net/netfilter/nf_conntrack.h>
  36 #include <net/netfilter/nf_conntrack_core.h>
  37 #include <net/netfilter/nf_conntrack_expect.h>
  38 #include <net/netfilter/nf_conntrack_helper.h>
  39 #include <net/netfilter/nf_conntrack_l3proto.h>
  40 #include <net/netfilter/nf_conntrack_l4proto.h>
  41 #include <net/netfilter/nf_conntrack_tuple.h>
  42 #include <net/netfilter/nf_conntrack_acct.h>
  43 #include <net/netfilter/nf_conntrack_zones.h>
  44 #ifdef CONFIG_NF_NAT_NEEDED
  45 #include <net/netfilter/nf_nat_core.h>
  46 #include <net/netfilter/nf_nat_protocol.h>
  47 #endif
  48
  49 #include <linux/netfilter/nfnetlink.h>
  50 #include <linux/netfilter/nfnetlink_conntrack.h>
  51
  52 MODULE_LICENSE("GPL");
  53
  54 static char __initdata version[] = "0.93";
  55
  56 static inline int
  57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  58                             const struct nf_conntrack_tuple *tuple,
  59                             struct nf_conntrack_l4proto *l4proto)
  60 {
  61         int ret = 0;
  62         struct nlattr *nest_parms;
  63
  64         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  65         if (!nest_parms)
  66                 goto nla_put_failure;
  67         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  68
  69         if (likely(l4proto->tuple_to_nlattr))
  70                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  71
  72         nla_nest_end(skb, nest_parms);
  73
  74         return ret;
  75
  76 nla_put_failure:
  77         return -1;
  78 }
  79
  80 static inline int
  81 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  82                          const struct nf_conntrack_tuple *tuple,
  83                          struct nf_conntrack_l3proto *l3proto)
  84 {
  85         int ret = 0;
  86         struct nlattr *nest_parms;
  87
  88         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  89         if (!nest_parms)
  90                 goto nla_put_failure;
  91
  92         if (likely(l3proto->tuple_to_nlattr))
  93                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  94
  95         nla_nest_end(skb, nest_parms);
  96
  97         return ret;
  98
  99 nla_put_failure:
 100         return -1;
 101 }
 102
 103 static int
 104 ctnetlink_dump_tuples(struct sk_buff *skb,
 105                       const struct nf_conntrack_tuple *tuple)
 106 {
 107         int ret;
 108         struct nf_conntrack_l3proto *l3proto;
 109         struct nf_conntrack_l4proto *l4proto;
 110
 111         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 112         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 113
 114         if (unlikely(ret < 0))
 115                 return ret;
 116
 117         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 118         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 119
 120         return ret;
 121 }
 122
 123 static inline int
 124 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 125 {
 126         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 127         return 0;
 128
 129 nla_put_failure:
 130         return -1;
 131 }
 132
 133 static inline int
 134 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 135 {
 136         long timeout = (ct->timeout.expires - jiffies) / HZ;
 137
 138         if (timeout < 0)
 139                 timeout = 0;
 140
 141         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 142         return 0;
 143
 144 nla_put_failure:
 145         return -1;
 146 }
 147
 148 static inline int
 149 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 150 {
 151         struct nf_conntrack_l4proto *l4proto;
 152         struct nlattr *nest_proto;
 153         int ret;
 154
 155         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 156         if (!l4proto->to_nlattr)
 157                 return 0;
 158
 159         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 160         if (!nest_proto)
 161                 goto nla_put_failure;
 162
 163         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 164
 165         nla_nest_end(skb, nest_proto);
 166
 167         return ret;
 168
 169 nla_put_failure:
 170         return -1;
 171 }
 172
 173 static inline int
 174 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 175 {
 176         struct nlattr *nest_helper;
 177         const struct nf_conn_help *help = nfct_help(ct);
 178         struct nf_conntrack_helper *helper;
 179
 180         if (!help)
 181                 return 0;
 182
 183         helper = rcu_dereference(help->helper);
 184         if (!helper)
 185                 goto out;
 186
 187         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 188         if (!nest_helper)
 189                 goto nla_put_failure;
 190         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 191
 192         if (helper->to_nlattr)
 193                 helper->to_nlattr(skb, ct);
 194
 195         nla_nest_end(skb, nest_helper);
 196 out:
 197         return 0;
 198
 199 nla_put_failure:
 200         return -1;
 201 }
 202
 203 static int
 204 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 205                         enum ip_conntrack_dir dir)
 206 {
 207         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 208         struct nlattr *nest_count;
 209         const struct nf_conn_counter *acct;
 210
 211         acct = nf_conn_acct_find(ct);
 212         if (!acct)
 213                 return 0;
 214
 215         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 216         if (!nest_count)
 217                 goto nla_put_failure;
 218
 219         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 220                      cpu_to_be64(acct[dir].packets));
 221         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 222                      cpu_to_be64(acct[dir].bytes));
 223
 224         nla_nest_end(skb, nest_count);
 225
 226         return 0;
 227
 228 nla_put_failure:
 229         return -1;
 230 }
 231
 232 #ifdef CONFIG_NF_CONNTRACK_MARK
 233 static inline int
 234 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 235 {
 236         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 237         return 0;
 238
 239 nla_put_failure:
 240         return -1;
 241 }
 242 #else
 243 #define ctnetlink_dump_mark(a, b) (0)
 244 #endif
 245
 246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 247 static inline int
 248 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 249 {
 250         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 251         return 0;
 252
 253 nla_put_failure:
 254         return -1;
 255 }
 256 #else
 257 #define ctnetlink_dump_secmark(a, b) (0)
 258 #endif
 259
 260 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 261
 262 static inline int
 263 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 264 {
 265         struct nlattr *nest_parms;
 266
 267         if (!(ct->status & IPS_EXPECTED))
 268                 return 0;
 269
 270         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 271         if (!nest_parms)
 272                 goto nla_put_failure;
 273         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 274                 goto nla_put_failure;
 275         nla_nest_end(skb, nest_parms);
 276
 277         return 0;
 278
 279 nla_put_failure:
 280         return -1;
 281 }
 282
 283 #ifdef CONFIG_NF_NAT_NEEDED
 284 static int
 285 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 286 {
 287         struct nlattr *nest_parms;
 288
 289         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 290         if (!nest_parms)
 291                 goto nla_put_failure;
 292
 293         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 294                      htonl(natseq->correction_pos));
 295         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 296                      htonl(natseq->offset_before));
 297         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 298                      htonl(natseq->offset_after));
 299
 300         nla_nest_end(skb, nest_parms);
 301
 302         return 0;
 303
 304 nla_put_failure:
 305         return -1;
 306 }
 307
 308 static inline int
 309 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 310 {
 311         struct nf_nat_seq *natseq;
 312         struct nf_conn_nat *nat = nfct_nat(ct);
 313
 314         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 315                 return 0;
 316
 317         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 318         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 319                 return -1;
 320
 321         natseq = &nat->seq[IP_CT_DIR_REPLY];
 322         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 323                 return -1;
 324
 325         return 0;
 326 }
 327 #else
 328 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 329 #endif
 330
 331 static inline int
 332 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 333 {
 334         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 335         return 0;
 336
 337 nla_put_failure:
 338         return -1;
 339 }
 340
 341 static inline int
 342 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 343 {
 344         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 345         return 0;
 346
 347 nla_put_failure:
 348         return -1;
 349 }
 350
 351 static int
 352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 353                     int event, struct nf_conn *ct)
 354 {
 355         struct nlmsghdr *nlh;
 356         struct nfgenmsg *nfmsg;
 357         struct nlattr *nest_parms;
 358         unsigned int flags = pid ? NLM_F_MULTI : 0;
 359
 360         event |= NFNL_SUBSYS_CTNETLINK << 8;
 361         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 362         if (nlh == NULL)
 363                 goto nlmsg_failure;
 364
 365         nfmsg = nlmsg_data(nlh);
 366         nfmsg->nfgen_family = nf_ct_l3num(ct);
 367         nfmsg->version      = NFNETLINK_V0;
 368         nfmsg->res_id       = 0;
 369
 370         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 371         if (!nest_parms)
 372                 goto nla_put_failure;
 373         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 374                 goto nla_put_failure;
 375         nla_nest_end(skb, nest_parms);
 376
 377         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 378         if (!nest_parms)
 379                 goto nla_put_failure;
 380         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 381                 goto nla_put_failure;
 382         nla_nest_end(skb, nest_parms);
 383
 384         if (nf_ct_zone(ct))
 385                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 386
 387         if (ctnetlink_dump_status(skb, ct) < 0 ||
 388             ctnetlink_dump_timeout(skb, ct) < 0 ||
 389             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 390             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 391             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 392             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 393             ctnetlink_dump_mark(skb, ct) < 0 ||
 394             ctnetlink_dump_secmark(skb, ct) < 0 ||
 395             ctnetlink_dump_id(skb, ct) < 0 ||
 396             ctnetlink_dump_use(skb, ct) < 0 ||
 397             ctnetlink_dump_master(skb, ct) < 0 ||
 398             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 399                 goto nla_put_failure;
 400
 401         nlmsg_end(skb, nlh);
 402         return skb->len;
 403
 404 nlmsg_failure:
 405 nla_put_failure:
 406         nlmsg_cancel(skb, nlh);
 407         return -1;
 408 }
 409
 410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 411 static inline size_t
 412 ctnetlink_proto_size(const struct nf_conn *ct)
 413 {
 414         struct nf_conntrack_l3proto *l3proto;
 415         struct nf_conntrack_l4proto *l4proto;
 416         size_t len = 0;
 417
 418         rcu_read_lock();
 419         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 420         len += l3proto->nla_size;
 421
 422         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 423         len += l4proto->nla_size;
 424         rcu_read_unlock();
 425
 426         return len;
 427 }
 428
 429 static inline size_t
 430 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 431 {
 432         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 433                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 434                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 435                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 436                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 437                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 438                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 439 #ifdef CONFIG_NF_CT_ACCT
 440                + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 441                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 442                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 443 #endif
 444                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 445                + nla_total_size(0) /* CTA_PROTOINFO */
 446                + nla_total_size(0) /* CTA_HELP */
 447                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 448 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 449                + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
 450 #endif
 451 #ifdef CONFIG_NF_NAT_NEEDED
 452                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 453                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 454 #endif
 455 #ifdef CONFIG_NF_CONNTRACK_MARK
 456                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 457 #endif
 458                + ctnetlink_proto_size(ct)
 459                ;
 460 }
 461
 462 static int
 463 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 464 {
 465         struct net *net;
 466         struct nlmsghdr *nlh;
 467         struct nfgenmsg *nfmsg;
 468         struct nlattr *nest_parms;
 469         struct nf_conn *ct = item->ct;
 470         struct sk_buff *skb;
 471         unsigned int type;
 472         unsigned int flags = 0, group;
 473         int err;
 474
 475         /* ignore our fake conntrack entry */
 476         if (ct == &nf_conntrack_untracked)
 477                 return 0;
 478
 479         if (events & (1 << IPCT_DESTROY)) {
 480                 type = IPCTNL_MSG_CT_DELETE;
 481                 group = NFNLGRP_CONNTRACK_DESTROY;
 482         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 483                 type = IPCTNL_MSG_CT_NEW;
 484                 flags = NLM_F_CREATE|NLM_F_EXCL;
 485                 group = NFNLGRP_CONNTRACK_NEW;
 486         } else  if (events) {
 487                 type = IPCTNL_MSG_CT_NEW;
 488                 group = NFNLGRP_CONNTRACK_UPDATE;
 489         } else
 490                 return 0;
 491
 492         net = nf_ct_net(ct);
 493         if (!item->report && !nfnetlink_has_listeners(net, group))
 494                 return 0;
 495
 496         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 497         if (skb == NULL)
 498                 goto errout;
 499
 500         type |= NFNL_SUBSYS_CTNETLINK << 8;
 501         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 502         if (nlh == NULL)
 503                 goto nlmsg_failure;
 504
 505         nfmsg = nlmsg_data(nlh);
 506         nfmsg->nfgen_family = nf_ct_l3num(ct);
 507         nfmsg->version  = NFNETLINK_V0;
 508         nfmsg->res_id   = 0;
 509
 510         rcu_read_lock();
 511         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 512         if (!nest_parms)
 513                 goto nla_put_failure;
 514         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 515                 goto nla_put_failure;
 516         nla_nest_end(skb, nest_parms);
 517
 518         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 519         if (!nest_parms)
 520                 goto nla_put_failure;
 521         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 522                 goto nla_put_failure;
 523         nla_nest_end(skb, nest_parms);
 524
 525         if (nf_ct_zone(ct))
 526                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 527
 528         if (ctnetlink_dump_id(skb, ct) < 0)
 529                 goto nla_put_failure;
 530
 531         if (ctnetlink_dump_status(skb, ct) < 0)
 532                 goto nla_put_failure;
 533
 534         if (events & (1 << IPCT_DESTROY)) {
 535                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 536                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 537                         goto nla_put_failure;
 538         } else {
 539                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 540                         goto nla_put_failure;
 541
 542                 if (events & (1 << IPCT_PROTOINFO)
 543                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 544                         goto nla_put_failure;
 545
 546                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 547                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 548                         goto nla_put_failure;
 549
 550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 551                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 552                     && ctnetlink_dump_secmark(skb, ct) < 0)
 553                         goto nla_put_failure;
 554 #endif
 555
 556                 if (events & (1 << IPCT_RELATED) &&
 557                     ctnetlink_dump_master(skb, ct) < 0)
 558                         goto nla_put_failure;
 559
 560                 if (events & (1 << IPCT_NATSEQADJ) &&
 561                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 562                         goto nla_put_failure;
 563         }
 564
 565 #ifdef CONFIG_NF_CONNTRACK_MARK
 566         if ((events & (1 << IPCT_MARK) || ct->mark)
 567             && ctnetlink_dump_mark(skb, ct) < 0)
 568                 goto nla_put_failure;
 569 #endif
 570         rcu_read_unlock();
 571
 572         nlmsg_end(skb, nlh);
 573         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 574                              GFP_ATOMIC);
 575         if (err == -ENOBUFS || err == -EAGAIN)
 576                 return -ENOBUFS;
 577
 578         return 0;
 579
 580 nla_put_failure:
 581         rcu_read_unlock();
 582         nlmsg_cancel(skb, nlh);
 583 nlmsg_failure:
 584         kfree_skb(skb);
 585 errout:
 586         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 587                 return -ENOBUFS;
 588
 589         return 0;
 590 }
 591 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 592
 593 static int ctnetlink_done(struct netlink_callback *cb)
 594 {
 595         if (cb->args[1])
 596                 nf_ct_put((struct nf_conn *)cb->args[1]);
 597         return 0;
 598 }
 599
 600 static int
 601 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 602 {
 603         struct net *net = sock_net(skb->sk);
 604         struct nf_conn *ct, *last;
 605         struct nf_conntrack_tuple_hash *h;
 606         struct hlist_nulls_node *n;
 607         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 608         u_int8_t l3proto = nfmsg->nfgen_family;
 609
 610         rcu_read_lock();
 611         last = (struct nf_conn *)cb->args[1];
 612         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 613 restart:
 614                 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
 615                                          hnnode) {
 616                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 617                                 continue;
 618                         ct = nf_ct_tuplehash_to_ctrack(h);
 619                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 620                                 continue;
 621                         /* Dump entries of a given L3 protocol number.
 622                          * If it is not specified, ie. l3proto == 0,
 623                          * then dump everything. */
 624                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 625                                 goto releasect;
 626                         if (cb->args[1]) {
 627                                 if (ct != last)
 628                                         goto releasect;
 629                                 cb->args[1] = 0;
 630                         }
 631                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 632                                                 cb->nlh->nlmsg_seq,
 633                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 634                                 cb->args[1] = (unsigned long)ct;
 635                                 goto out;
 636                         }
 637
 638                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 639                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 640                                 struct nf_conn_counter *acct;
 641
 642                                 acct = nf_conn_acct_find(ct);
 643                                 if (acct)
 644                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 645                         }
 646 releasect:
 647                 nf_ct_put(ct);
 648                 }
 649                 if (cb->args[1]) {
 650                         cb->args[1] = 0;
 651                         goto restart;
 652                 }
 653         }
 654 out:
 655         rcu_read_unlock();
 656         if (last)
 657                 nf_ct_put(last);
 658
 659         return skb->len;
 660 }
 661
 662 static inline int
 663 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 664 {
 665         struct nlattr *tb[CTA_IP_MAX+1];
 666         struct nf_conntrack_l3proto *l3proto;
 667         int ret = 0;
 668
 669         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 670
 671         rcu_read_lock();
 672         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 673
 674         if (likely(l3proto->nlattr_to_tuple)) {
 675                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 676                                           l3proto->nla_policy);
 677                 if (ret == 0)
 678                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 679         }
 680
 681         rcu_read_unlock();
 682
 683         return ret;
 684 }
 685
 686 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 687         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 688 };
 689
 690 static inline int
 691 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 692                             struct nf_conntrack_tuple *tuple)
 693 {
 694         struct nlattr *tb[CTA_PROTO_MAX+1];
 695         struct nf_conntrack_l4proto *l4proto;
 696         int ret = 0;
 697
 698         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 699         if (ret < 0)
 700                 return ret;
 701
 702         if (!tb[CTA_PROTO_NUM])
 703                 return -EINVAL;
 704         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 705
 706         rcu_read_lock();
 707         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 708
 709         if (likely(l4proto->nlattr_to_tuple)) {
 710                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 711                                           l4proto->nla_policy);
 712                 if (ret == 0)
 713                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 714         }
 715
 716         rcu_read_unlock();
 717
 718         return ret;
 719 }
 720
 721 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 722         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 723         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 724 };
 725
 726 static int
 727 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 728                       struct nf_conntrack_tuple *tuple,
 729                       enum ctattr_tuple type, u_int8_t l3num)
 730 {
 731         struct nlattr *tb[CTA_TUPLE_MAX+1];
 732         int err;
 733
 734         memset(tuple, 0, sizeof(*tuple));
 735
 736         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 737
 738         if (!tb[CTA_TUPLE_IP])
 739                 return -EINVAL;
 740
 741         tuple->src.l3num = l3num;
 742
 743         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 744         if (err < 0)
 745                 return err;
 746
 747         if (!tb[CTA_TUPLE_PROTO])
 748                 return -EINVAL;
 749
 750         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 751         if (err < 0)
 752                 return err;
 753
 754         /* orig and expect tuples get DIR_ORIGINAL */
 755         if (type == CTA_TUPLE_REPLY)
 756                 tuple->dst.dir = IP_CT_DIR_REPLY;
 757         else
 758                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 759
 760         return 0;
 761 }
 762
 763 static int
 764 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 765 {
 766         if (attr)
 767 #ifdef CONFIG_NF_CONNTRACK_ZONES
 768                 *zone = ntohs(nla_get_be16(attr));
 769 #else
 770                 return -EOPNOTSUPP;
 771 #endif
 772         else
 773                 *zone = 0;
 774
 775         return 0;
 776 }
 777
 778 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 779         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 780 };
 781
 782 static inline int
 783 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 784 {
 785         struct nlattr *tb[CTA_HELP_MAX+1];
 786
 787         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 788
 789         if (!tb[CTA_HELP_NAME])
 790                 return -EINVAL;
 791
 792         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 793
 794         return 0;
 795 }
 796
 797 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 798         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 799         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 800         [CTA_STATUS]            = { .type = NLA_U32 },
 801         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 802         [CTA_HELP]              = { .type = NLA_NESTED },
 803         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 804         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 805         [CTA_MARK]              = { .type = NLA_U32 },
 806         [CTA_ID]                = { .type = NLA_U32 },
 807         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 808         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 809         [CTA_ZONE]              = { .type = NLA_U16 },
 810 };
 811
 812 static int
 813 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 814                         const struct nlmsghdr *nlh,
 815                         const struct nlattr * const cda[])
 816 {
 817         struct net *net = sock_net(ctnl);
 818         struct nf_conntrack_tuple_hash *h;
 819         struct nf_conntrack_tuple tuple;
 820         struct nf_conn *ct;
 821         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 822         u_int8_t u3 = nfmsg->nfgen_family;
 823         u16 zone;
 824         int err;
 825
 826         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 827         if (err < 0)
 828                 return err;
 829
 830         if (cda[CTA_TUPLE_ORIG])
 831                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 832         else if (cda[CTA_TUPLE_REPLY])
 833                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 834         else {
 835                 /* Flush the whole table */
 836                 nf_conntrack_flush_report(net,
 837                                          NETLINK_CB(skb).pid,
 838                                          nlmsg_report(nlh));
 839                 return 0;
 840         }
 841
 842         if (err < 0)
 843                 return err;
 844
 845         h = nf_conntrack_find_get(net, zone, &tuple);
 846         if (!h)
 847                 return -ENOENT;
 848
 849         ct = nf_ct_tuplehash_to_ctrack(h);
 850
 851         if (cda[CTA_ID]) {
 852                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 853                 if (id != (u32)(unsigned long)ct) {
 854                         nf_ct_put(ct);
 855                         return -ENOENT;
 856                 }
 857         }
 858
 859         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 860                                       NETLINK_CB(skb).pid,
 861                                       nlmsg_report(nlh)) < 0) {
 862                 nf_ct_delete_from_lists(ct);
 863                 /* we failed to report the event, try later */
 864                 nf_ct_insert_dying_list(ct);
 865                 nf_ct_put(ct);
 866                 return 0;
 867         }
 868
 869         /* death_by_timeout would report the event again */
 870         set_bit(IPS_DYING_BIT, &ct->status);
 871
 872         nf_ct_kill(ct);
 873         nf_ct_put(ct);
 874
 875         return 0;
 876 }
 877
 878 static int
 879 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 880                         const struct nlmsghdr *nlh,
 881                         const struct nlattr * const cda[])
 882 {
 883         struct net *net = sock_net(ctnl);
 884         struct nf_conntrack_tuple_hash *h;
 885         struct nf_conntrack_tuple tuple;
 886         struct nf_conn *ct;
 887         struct sk_buff *skb2 = NULL;
 888         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 889         u_int8_t u3 = nfmsg->nfgen_family;
 890         u16 zone;
 891         int err;
 892
 893         if (nlh->nlmsg_flags & NLM_F_DUMP)
 894                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 895                                           ctnetlink_done);
 896
 897         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 898         if (err < 0)
 899                 return err;
 900
 901         if (cda[CTA_TUPLE_ORIG])
 902                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 903         else if (cda[CTA_TUPLE_REPLY])
 904                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 905         else
 906                 return -EINVAL;
 907
 908         if (err < 0)
 909                 return err;
 910
 911         h = nf_conntrack_find_get(net, zone, &tuple);
 912         if (!h)
 913                 return -ENOENT;
 914
 915         ct = nf_ct_tuplehash_to_ctrack(h);
 916
 917         err = -ENOMEM;
 918         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 919         if (skb2 == NULL) {
 920                 nf_ct_put(ct);
 921                 return -ENOMEM;
 922         }
 923
 924         rcu_read_lock();
 925         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 926                                   IPCTNL_MSG_CT_NEW, ct);
 927         rcu_read_unlock();
 928         nf_ct_put(ct);
 929         if (err <= 0)
 930                 goto free;
 931
 932         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 933         if (err < 0)
 934                 goto out;
 935
 936         return 0;
 937
 938 free:
 939         kfree_skb(skb2);
 940 out:
 941         return err;
 942 }
 943
 944 #ifdef CONFIG_NF_NAT_NEEDED
 945 static int
 946 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 947                           enum nf_nat_manip_type manip,
 948                           const struct nlattr *attr)
 949 {
 950         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 951
 952         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 953         if (!parse_nat_setup) {
 954 #ifdef CONFIG_MODULES
 955                 rcu_read_unlock();
 956                 spin_unlock_bh(&nf_conntrack_lock);
 957                 nfnl_unlock();
 958                 if (request_module("nf-nat-ipv4") < 0) {
 959                         nfnl_lock();
 960                         spin_lock_bh(&nf_conntrack_lock);
 961                         rcu_read_lock();
 962                         return -EOPNOTSUPP;
 963                 }
 964                 nfnl_lock();
 965                 spin_lock_bh(&nf_conntrack_lock);
 966                 rcu_read_lock();
 967                 if (nfnetlink_parse_nat_setup_hook)
 968                         return -EAGAIN;
 969 #endif
 970                 return -EOPNOTSUPP;
 971         }
 972
 973         return parse_nat_setup(ct, manip, attr);
 974 }
 975 #endif
 976
 977 static int
 978 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
 979 {
 980         unsigned long d;
 981         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 982         d = ct->status ^ status;
 983
 984         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 985                 /* unchangeable */
 986                 return -EBUSY;
 987
 988         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 989                 /* SEEN_REPLY bit can only be set */
 990                 return -EBUSY;
 991
 992         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 993                 /* ASSURED bit can only be set */
 994                 return -EBUSY;
 995
 996         /* Be careful here, modifying NAT bits can screw up things,
 997          * so don't let users modify them directly if they don't pass
 998          * nf_nat_range. */
 999         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1000         return 0;
1001 }
1002
1003 static int
1004 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1005 {
1006 #ifdef CONFIG_NF_NAT_NEEDED
1007         int ret;
1008
1009         if (cda[CTA_NAT_DST]) {
1010                 ret = ctnetlink_parse_nat_setup(ct,
1011                                                 IP_NAT_MANIP_DST,
1012                                                 cda[CTA_NAT_DST]);
1013                 if (ret < 0)
1014                         return ret;
1015         }
1016         if (cda[CTA_NAT_SRC]) {
1017                 ret = ctnetlink_parse_nat_setup(ct,
1018                                                 IP_NAT_MANIP_SRC,
1019                                                 cda[CTA_NAT_SRC]);
1020                 if (ret < 0)
1021                         return ret;
1022         }
1023         return 0;
1024 #else
1025         return -EOPNOTSUPP;
1026 #endif
1027 }
1028
1029 static inline int
1030 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1031 {
1032         struct nf_conntrack_helper *helper;
1033         struct nf_conn_help *help = nfct_help(ct);
1034         char *helpname = NULL;
1035         int err;
1036
1037         /* don't change helper of sibling connections */
1038         if (ct->master)
1039                 return -EBUSY;
1040
1041         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1042         if (err < 0)
1043                 return err;
1044
1045         if (!strcmp(helpname, "")) {
1046                 if (help && help->helper) {
1047                         /* we had a helper before ... */
1048                         nf_ct_remove_expectations(ct);
1049                         rcu_assign_pointer(help->helper, NULL);
1050                 }
1051
1052                 return 0;
1053         }
1054
1055         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1056                                             nf_ct_protonum(ct));
1057         if (helper == NULL) {
1058 #ifdef CONFIG_MODULES
1059                 spin_unlock_bh(&nf_conntrack_lock);
1060
1061                 if (request_module("nfct-helper-%s", helpname) < 0) {
1062                         spin_lock_bh(&nf_conntrack_lock);
1063                         return -EOPNOTSUPP;
1064                 }
1065
1066                 spin_lock_bh(&nf_conntrack_lock);
1067                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1068                                                     nf_ct_protonum(ct));
1069                 if (helper)
1070                         return -EAGAIN;
1071 #endif
1072                 return -EOPNOTSUPP;
1073         }
1074
1075         if (help) {
1076                 if (help->helper == helper)
1077                         return 0;
1078                 if (help->helper)
1079                         return -EBUSY;
1080                 /* need to zero data of old helper */
1081                 memset(&help->help, 0, sizeof(help->help));
1082         } else {
1083                 /* we cannot set a helper for an existing conntrack */
1084                 return -EOPNOTSUPP;
1085         }
1086
1087         rcu_assign_pointer(help->helper, helper);
1088
1089         return 0;
1090 }
1091
1092 static inline int
1093 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1094 {
1095         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1096
1097         if (!del_timer(&ct->timeout))
1098                 return -ETIME;
1099
1100         ct->timeout.expires = jiffies + timeout * HZ;
1101         add_timer(&ct->timeout);
1102
1103         return 0;
1104 }
1105
1106 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1107         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1108         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1109         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1110 };
1111
1112 static inline int
1113 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1114 {
1115         const struct nlattr *attr = cda[CTA_PROTOINFO];
1116         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1117         struct nf_conntrack_l4proto *l4proto;
1118         int err = 0;
1119
1120         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1121
1122         rcu_read_lock();
1123         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1124         if (l4proto->from_nlattr)
1125                 err = l4proto->from_nlattr(tb, ct);
1126         rcu_read_unlock();
1127
1128         return err;
1129 }
1130
1131 #ifdef CONFIG_NF_NAT_NEEDED
1132 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1133         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1134         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1135         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1136 };
1137
1138 static inline int
1139 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1140 {
1141         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1142
1143         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1144
1145         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1146                 return -EINVAL;
1147
1148         natseq->correction_pos =
1149                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1150
1151         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1152                 return -EINVAL;
1153
1154         natseq->offset_before =
1155                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1156
1157         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1158                 return -EINVAL;
1159
1160         natseq->offset_after =
1161                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1162
1163         return 0;
1164 }
1165
1166 static int
1167 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1168                              const struct nlattr * const cda[])
1169 {
1170         int ret = 0;
1171         struct nf_conn_nat *nat = nfct_nat(ct);
1172
1173         if (!nat)
1174                 return 0;
1175
1176         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1177                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1178                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1179                 if (ret < 0)
1180                         return ret;
1181
1182                 ct->status |= IPS_SEQ_ADJUST;
1183         }
1184
1185         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1186                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1187                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1188                 if (ret < 0)
1189                         return ret;
1190
1191                 ct->status |= IPS_SEQ_ADJUST;
1192         }
1193
1194         return 0;
1195 }
1196 #endif
1197
1198 static int
1199 ctnetlink_change_conntrack(struct nf_conn *ct,
1200                            const struct nlattr * const cda[])
1201 {
1202         int err;
1203
1204         /* only allow NAT changes and master assignation for new conntracks */
1205         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1206                 return -EOPNOTSUPP;
1207
1208         if (cda[CTA_HELP]) {
1209                 err = ctnetlink_change_helper(ct, cda);
1210                 if (err < 0)
1211                         return err;
1212         }
1213
1214         if (cda[CTA_TIMEOUT]) {
1215                 err = ctnetlink_change_timeout(ct, cda);
1216                 if (err < 0)
1217                         return err;
1218         }
1219
1220         if (cda[CTA_STATUS]) {
1221                 err = ctnetlink_change_status(ct, cda);
1222                 if (err < 0)
1223                         return err;
1224         }
1225
1226         if (cda[CTA_PROTOINFO]) {
1227                 err = ctnetlink_change_protoinfo(ct, cda);
1228                 if (err < 0)
1229                         return err;
1230         }
1231
1232 #if defined(CONFIG_NF_CONNTRACK_MARK)
1233         if (cda[CTA_MARK])
1234                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1235 #endif
1236
1237 #ifdef CONFIG_NF_NAT_NEEDED
1238         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1239                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1240                 if (err < 0)
1241                         return err;
1242         }
1243 #endif
1244
1245         return 0;
1246 }
1247
1248 static struct nf_conn *
1249 ctnetlink_create_conntrack(struct net *net, u16 zone,
1250                            const struct nlattr * const cda[],
1251                            struct nf_conntrack_tuple *otuple,
1252                            struct nf_conntrack_tuple *rtuple,
1253                            u8 u3)
1254 {
1255         struct nf_conn *ct;
1256         int err = -EINVAL;
1257         struct nf_conntrack_helper *helper;
1258
1259         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1260         if (IS_ERR(ct))
1261                 return ERR_PTR(-ENOMEM);
1262
1263         if (!cda[CTA_TIMEOUT])
1264                 goto err1;
1265         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1266
1267         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1268
1269         rcu_read_lock();
1270         if (cda[CTA_HELP]) {
1271                 char *helpname = NULL;
1272
1273                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1274                 if (err < 0)
1275                         goto err2;
1276
1277                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1278                                                     nf_ct_protonum(ct));
1279                 if (helper == NULL) {
1280                         rcu_read_unlock();
1281 #ifdef CONFIG_MODULES
1282                         if (request_module("nfct-helper-%s", helpname) < 0) {
1283                                 err = -EOPNOTSUPP;
1284                                 goto err1;
1285                         }
1286
1287                         rcu_read_lock();
1288                         helper = __nf_conntrack_helper_find(helpname,
1289                                                             nf_ct_l3num(ct),
1290                                                             nf_ct_protonum(ct));
1291                         if (helper) {
1292                                 err = -EAGAIN;
1293                                 goto err2;
1294                         }
1295                         rcu_read_unlock();
1296 #endif
1297                         err = -EOPNOTSUPP;
1298                         goto err1;
1299                 } else {
1300                         struct nf_conn_help *help;
1301
1302                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1303                         if (help == NULL) {
1304                                 err = -ENOMEM;
1305                                 goto err2;
1306                         }
1307
1308                         /* not in hash table yet so not strictly necessary */
1309                         rcu_assign_pointer(help->helper, helper);
1310                 }
1311         } else {
1312                 /* try an implicit helper assignation */
1313                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1314                 if (err < 0)
1315                         goto err2;
1316         }
1317
1318         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1319                 err = ctnetlink_change_nat(ct, cda);
1320                 if (err < 0)
1321                         goto err2;
1322         }
1323
1324         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1325         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1326         /* we must add conntrack extensions before confirmation. */
1327         ct->status |= IPS_CONFIRMED;
1328
1329         if (cda[CTA_STATUS]) {
1330                 err = ctnetlink_change_status(ct, cda);
1331                 if (err < 0)
1332                         goto err2;
1333         }
1334
1335 #ifdef CONFIG_NF_NAT_NEEDED
1336         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1337                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1338                 if (err < 0)
1339                         goto err2;
1340         }
1341 #endif
1342
1343         if (cda[CTA_PROTOINFO]) {
1344                 err = ctnetlink_change_protoinfo(ct, cda);
1345                 if (err < 0)
1346                         goto err2;
1347         }
1348
1349 #if defined(CONFIG_NF_CONNTRACK_MARK)
1350         if (cda[CTA_MARK])
1351                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1352 #endif
1353
1354         /* setup master conntrack: this is a confirmed expectation */
1355         if (cda[CTA_TUPLE_MASTER]) {
1356                 struct nf_conntrack_tuple master;
1357                 struct nf_conntrack_tuple_hash *master_h;
1358                 struct nf_conn *master_ct;
1359
1360                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1361                 if (err < 0)
1362                         goto err2;
1363
1364                 master_h = nf_conntrack_find_get(net, zone, &master);
1365                 if (master_h == NULL) {
1366                         err = -ENOENT;
1367                         goto err2;
1368                 }
1369                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1370                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1371                 ct->master = master_ct;
1372         }
1373
1374         add_timer(&ct->timeout);
1375         nf_conntrack_hash_insert(ct);
1376         rcu_read_unlock();
1377
1378         return ct;
1379
1380 err2:
1381         rcu_read_unlock();
1382 err1:
1383         nf_conntrack_free(ct);
1384         return ERR_PTR(err);
1385 }
1386
1387 static int
1388 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1389                         const struct nlmsghdr *nlh,
1390                         const struct nlattr * const cda[])
1391 {
1392         struct net *net = sock_net(ctnl);
1393         struct nf_conntrack_tuple otuple, rtuple;
1394         struct nf_conntrack_tuple_hash *h = NULL;
1395         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1396         u_int8_t u3 = nfmsg->nfgen_family;
1397         u16 zone;
1398         int err;
1399
1400         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1401         if (err < 0)
1402                 return err;
1403
1404         if (cda[CTA_TUPLE_ORIG]) {
1405                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1406                 if (err < 0)
1407                         return err;
1408         }
1409
1410         if (cda[CTA_TUPLE_REPLY]) {
1411                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1412                 if (err < 0)
1413                         return err;
1414         }
1415
1416         spin_lock_bh(&nf_conntrack_lock);
1417         if (cda[CTA_TUPLE_ORIG])
1418                 h = __nf_conntrack_find(net, zone, &otuple);
1419         else if (cda[CTA_TUPLE_REPLY])
1420                 h = __nf_conntrack_find(net, zone, &rtuple);
1421
1422         if (h == NULL) {
1423                 err = -ENOENT;
1424                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1425                         struct nf_conn *ct;
1426                         enum ip_conntrack_events events;
1427
1428                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1429                                                         &rtuple, u3);
1430                         if (IS_ERR(ct)) {
1431                                 err = PTR_ERR(ct);
1432                                 goto out_unlock;
1433                         }
1434                         err = 0;
1435                         nf_conntrack_get(&ct->ct_general);
1436                         spin_unlock_bh(&nf_conntrack_lock);
1437                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1438                                 events = IPCT_RELATED;
1439                         else
1440                                 events = IPCT_NEW;
1441
1442                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1443                                                       (1 << IPCT_ASSURED) |
1444                                                       (1 << IPCT_HELPER) |
1445                                                       (1 << IPCT_PROTOINFO) |
1446                                                       (1 << IPCT_NATSEQADJ) |
1447                                                       (1 << IPCT_MARK) | events,
1448                                                       ct, NETLINK_CB(skb).pid,
1449                                                       nlmsg_report(nlh));
1450                         nf_ct_put(ct);
1451                 } else
1452                         spin_unlock_bh(&nf_conntrack_lock);
1453
1454                 return err;
1455         }
1456         /* implicit 'else' */
1457
1458         /* We manipulate the conntrack inside the global conntrack table lock,
1459          * so there's no need to increase the refcount */
1460         err = -EEXIST;
1461         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1462                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1463
1464                 err = ctnetlink_change_conntrack(ct, cda);
1465                 if (err == 0) {
1466                         nf_conntrack_get(&ct->ct_general);
1467                         spin_unlock_bh(&nf_conntrack_lock);
1468                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1469                                                       (1 << IPCT_ASSURED) |
1470                                                       (1 << IPCT_HELPER) |
1471                                                       (1 << IPCT_PROTOINFO) |
1472                                                       (1 << IPCT_NATSEQADJ) |
1473                                                       (1 << IPCT_MARK),
1474                                                       ct, NETLINK_CB(skb).pid,
1475                                                       nlmsg_report(nlh));
1476                         nf_ct_put(ct);
1477                 } else
1478                         spin_unlock_bh(&nf_conntrack_lock);
1479
1480                 return err;
1481         }
1482
1483 out_unlock:
1484         spin_unlock_bh(&nf_conntrack_lock);
1485         return err;
1486 }
1487
1488 /***********************************************************************
1489  * EXPECT
1490  ***********************************************************************/
1491
1492 static inline int
1493 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1494                          const struct nf_conntrack_tuple *tuple,
1495                          enum ctattr_expect type)
1496 {
1497         struct nlattr *nest_parms;
1498
1499         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1500         if (!nest_parms)
1501                 goto nla_put_failure;
1502         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1503                 goto nla_put_failure;
1504         nla_nest_end(skb, nest_parms);
1505
1506         return 0;
1507
1508 nla_put_failure:
1509         return -1;
1510 }
1511
1512 static inline int
1513 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1514                         const struct nf_conntrack_tuple *tuple,
1515                         const struct nf_conntrack_tuple_mask *mask)
1516 {
1517         int ret;
1518         struct nf_conntrack_l3proto *l3proto;
1519         struct nf_conntrack_l4proto *l4proto;
1520         struct nf_conntrack_tuple m;
1521         struct nlattr *nest_parms;
1522
1523         memset(&m, 0xFF, sizeof(m));
1524         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1525         m.src.u.all = mask->src.u.all;
1526         m.dst.protonum = tuple->dst.protonum;
1527
1528         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1529         if (!nest_parms)
1530                 goto nla_put_failure;
1531
1532         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1533         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1534
1535         if (unlikely(ret < 0))
1536                 goto nla_put_failure;
1537
1538         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1539         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1540         if (unlikely(ret < 0))
1541                 goto nla_put_failure;
1542
1543         nla_nest_end(skb, nest_parms);
1544
1545         return 0;
1546
1547 nla_put_failure:
1548         return -1;
1549 }
1550
1551 static int
1552 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1553                           const struct nf_conntrack_expect *exp)
1554 {
1555         struct nf_conn *master = exp->master;
1556         struct nf_conntrack_helper *helper;
1557         long timeout = (exp->timeout.expires - jiffies) / HZ;
1558
1559         if (timeout < 0)
1560                 timeout = 0;
1561
1562         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1563                 goto nla_put_failure;
1564         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1565                 goto nla_put_failure;
1566         if (ctnetlink_exp_dump_tuple(skb,
1567                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1568                                  CTA_EXPECT_MASTER) < 0)
1569                 goto nla_put_failure;
1570
1571         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1572         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1573         helper = rcu_dereference(nfct_help(master)->helper);
1574         if (helper)
1575                 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1576
1577         return 0;
1578
1579 nla_put_failure:
1580         return -1;
1581 }
1582
1583 static int
1584 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1585                         int event, const struct nf_conntrack_expect *exp)
1586 {
1587         struct nlmsghdr *nlh;
1588         struct nfgenmsg *nfmsg;
1589         unsigned int flags = pid ? NLM_F_MULTI : 0;
1590
1591         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1592         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1593         if (nlh == NULL)
1594                 goto nlmsg_failure;
1595
1596         nfmsg = nlmsg_data(nlh);
1597         nfmsg->nfgen_family = exp->tuple.src.l3num;
1598         nfmsg->version      = NFNETLINK_V0;
1599         nfmsg->res_id       = 0;
1600
1601         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1602                 goto nla_put_failure;
1603
1604         nlmsg_end(skb, nlh);
1605         return skb->len;
1606
1607 nlmsg_failure:
1608 nla_put_failure:
1609         nlmsg_cancel(skb, nlh);
1610         return -1;
1611 }
1612
1613 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1614 static int
1615 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1616 {
1617         struct nf_conntrack_expect *exp = item->exp;
1618         struct net *net = nf_ct_exp_net(exp);
1619         struct nlmsghdr *nlh;
1620         struct nfgenmsg *nfmsg;
1621         struct sk_buff *skb;
1622         unsigned int type;
1623         int flags = 0;
1624
1625         if (events & (1 << IPEXP_NEW)) {
1626                 type = IPCTNL_MSG_EXP_NEW;
1627                 flags = NLM_F_CREATE|NLM_F_EXCL;
1628         } else
1629                 return 0;
1630
1631         if (!item->report &&
1632             !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1633                 return 0;
1634
1635         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1636         if (skb == NULL)
1637                 goto errout;
1638
1639         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1640         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1641         if (nlh == NULL)
1642                 goto nlmsg_failure;
1643
1644         nfmsg = nlmsg_data(nlh);
1645         nfmsg->nfgen_family = exp->tuple.src.l3num;
1646         nfmsg->version      = NFNETLINK_V0;
1647         nfmsg->res_id       = 0;
1648
1649         rcu_read_lock();
1650         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1651                 goto nla_put_failure;
1652         rcu_read_unlock();
1653
1654         nlmsg_end(skb, nlh);
1655         nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1656                        item->report, GFP_ATOMIC);
1657         return 0;
1658
1659 nla_put_failure:
1660         rcu_read_unlock();
1661         nlmsg_cancel(skb, nlh);
1662 nlmsg_failure:
1663         kfree_skb(skb);
1664 errout:
1665         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1666         return 0;
1667 }
1668 #endif
1669 static int ctnetlink_exp_done(struct netlink_callback *cb)
1670 {
1671         if (cb->args[1])
1672                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1673         return 0;
1674 }
1675
1676 static int
1677 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1678 {
1679         struct net *net = sock_net(skb->sk);
1680         struct nf_conntrack_expect *exp, *last;
1681         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1682         struct hlist_node *n;
1683         u_int8_t l3proto = nfmsg->nfgen_family;
1684
1685         rcu_read_lock();
1686         last = (struct nf_conntrack_expect *)cb->args[1];
1687         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1688 restart:
1689                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1690                                      hnode) {
1691                         if (l3proto && exp->tuple.src.l3num != l3proto)
1692                                 continue;
1693                         if (cb->args[1]) {
1694                                 if (exp != last)
1695                                         continue;
1696                                 cb->args[1] = 0;
1697                         }
1698                         if (ctnetlink_exp_fill_info(skb,
1699                                                     NETLINK_CB(cb->skb).pid,
1700                                                     cb->nlh->nlmsg_seq,
1701                                                     IPCTNL_MSG_EXP_NEW,
1702                                                     exp) < 0) {
1703                                 if (!atomic_inc_not_zero(&exp->use))
1704                                         continue;
1705                                 cb->args[1] = (unsigned long)exp;
1706                                 goto out;
1707                         }
1708                 }
1709                 if (cb->args[1]) {
1710                         cb->args[1] = 0;
1711                         goto restart;
1712                 }
1713         }
1714 out:
1715         rcu_read_unlock();
1716         if (last)
1717                 nf_ct_expect_put(last);
1718
1719         return skb->len;
1720 }
1721
1722 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1723         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1724         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1725         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1726         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1727         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1728         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1729 };
1730
1731 static int
1732 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1733                      const struct nlmsghdr *nlh,
1734                      const struct nlattr * const cda[])
1735 {
1736         struct net *net = sock_net(ctnl);
1737         struct nf_conntrack_tuple tuple;
1738         struct nf_conntrack_expect *exp;
1739         struct sk_buff *skb2;
1740         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1741         u_int8_t u3 = nfmsg->nfgen_family;
1742         u16 zone;
1743         int err;
1744
1745         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1746                 return netlink_dump_start(ctnl, skb, nlh,
1747                                           ctnetlink_exp_dump_table,
1748                                           ctnetlink_exp_done);
1749         }
1750
1751         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1752         if (err < 0)
1753                 return err;
1754
1755         if (cda[CTA_EXPECT_MASTER])
1756                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1757         else
1758                 return -EINVAL;
1759
1760         if (err < 0)
1761                 return err;
1762
1763         exp = nf_ct_expect_find_get(net, zone, &tuple);
1764         if (!exp)
1765                 return -ENOENT;
1766
1767         if (cda[CTA_EXPECT_ID]) {
1768                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1769                 if (ntohl(id) != (u32)(unsigned long)exp) {
1770                         nf_ct_expect_put(exp);
1771                         return -ENOENT;
1772                 }
1773         }
1774
1775         err = -ENOMEM;
1776         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1777         if (skb2 == NULL)
1778                 goto out;
1779
1780         rcu_read_lock();
1781         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1782                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1783         rcu_read_unlock();
1784         if (err <= 0)
1785                 goto free;
1786
1787         nf_ct_expect_put(exp);
1788
1789         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1790
1791 free:
1792         kfree_skb(skb2);
1793 out:
1794         nf_ct_expect_put(exp);
1795         return err;
1796 }
1797
1798 static int
1799 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1800                      const struct nlmsghdr *nlh,
1801                      const struct nlattr * const cda[])
1802 {
1803         struct net *net = sock_net(ctnl);
1804         struct nf_conntrack_expect *exp;
1805         struct nf_conntrack_tuple tuple;
1806         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1807         struct hlist_node *n, *next;
1808         u_int8_t u3 = nfmsg->nfgen_family;
1809         unsigned int i;
1810         u16 zone;
1811         int err;
1812
1813         if (cda[CTA_EXPECT_TUPLE]) {
1814                 /* delete a single expect by tuple */
1815                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1816                 if (err < 0)
1817                         return err;
1818
1819                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1820                 if (err < 0)
1821                         return err;
1822
1823                 /* bump usage count to 2 */
1824                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1825                 if (!exp)
1826                         return -ENOENT;
1827
1828                 if (cda[CTA_EXPECT_ID]) {
1829                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1830                         if (ntohl(id) != (u32)(unsigned long)exp) {
1831                                 nf_ct_expect_put(exp);
1832                                 return -ENOENT;
1833                         }
1834                 }
1835
1836                 /* after list removal, usage count == 1 */
1837                 nf_ct_unexpect_related(exp);
1838                 /* have to put what we 'get' above.
1839                  * after this line usage count == 0 */
1840                 nf_ct_expect_put(exp);
1841         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1842                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1843                 struct nf_conn_help *m_help;
1844
1845                 /* delete all expectations for this helper */
1846                 spin_lock_bh(&nf_conntrack_lock);
1847                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1848                         hlist_for_each_entry_safe(exp, n, next,
1849                                                   &net->ct.expect_hash[i],
1850                                                   hnode) {
1851                                 m_help = nfct_help(exp->master);
1852                                 if (!strcmp(m_help->helper->name, name) &&
1853                                     del_timer(&exp->timeout)) {
1854                                         nf_ct_unlink_expect(exp);
1855                                         nf_ct_expect_put(exp);
1856                                 }
1857                         }
1858                 }
1859                 spin_unlock_bh(&nf_conntrack_lock);
1860         } else {
1861                 /* This basically means we have to flush everything*/
1862                 spin_lock_bh(&nf_conntrack_lock);
1863                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1864                         hlist_for_each_entry_safe(exp, n, next,
1865                                                   &net->ct.expect_hash[i],
1866                                                   hnode) {
1867                                 if (del_timer(&exp->timeout)) {
1868                                         nf_ct_unlink_expect(exp);
1869                                         nf_ct_expect_put(exp);
1870                                 }
1871                         }
1872                 }
1873                 spin_unlock_bh(&nf_conntrack_lock);
1874         }
1875
1876         return 0;
1877 }
1878 static int
1879 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1880                         const struct nlattr * const cda[])
1881 {
1882         return -EOPNOTSUPP;
1883 }
1884
1885 static int
1886 ctnetlink_create_expect(struct net *net, u16 zone,
1887                         const struct nlattr * const cda[],
1888                         u_int8_t u3,
1889                         u32 pid, int report)
1890 {
1891         struct nf_conntrack_tuple tuple, mask, master_tuple;
1892         struct nf_conntrack_tuple_hash *h = NULL;
1893         struct nf_conntrack_expect *exp;
1894         struct nf_conn *ct;
1895         struct nf_conn_help *help;
1896         int err = 0;
1897
1898         /* caller guarantees that those three CTA_EXPECT_* exist */
1899         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1900         if (err < 0)
1901                 return err;
1902         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1903         if (err < 0)
1904                 return err;
1905         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1906         if (err < 0)
1907                 return err;
1908
1909         /* Look for master conntrack of this expectation */
1910         h = nf_conntrack_find_get(net, zone, &master_tuple);
1911         if (!h)
1912                 return -ENOENT;
1913         ct = nf_ct_tuplehash_to_ctrack(h);
1914         help = nfct_help(ct);
1915
1916         if (!help || !help->helper) {
1917                 /* such conntrack hasn't got any helper, abort */
1918                 err = -EOPNOTSUPP;
1919                 goto out;
1920         }
1921
1922         exp = nf_ct_expect_alloc(ct);
1923         if (!exp) {
1924                 err = -ENOMEM;
1925                 goto out;
1926         }
1927
1928         exp->class = 0;
1929         exp->expectfn = NULL;
1930         exp->flags = 0;
1931         exp->master = ct;
1932         exp->helper = NULL;
1933         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1934         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1935         exp->mask.src.u.all = mask.src.u.all;
1936
1937         err = nf_ct_expect_related_report(exp, pid, report);
1938         nf_ct_expect_put(exp);
1939
1940 out:
1941         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1942         return err;
1943 }
1944
1945 static int
1946 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1947                      const struct nlmsghdr *nlh,
1948                      const struct nlattr * const cda[])
1949 {
1950         struct net *net = sock_net(ctnl);
1951         struct nf_conntrack_tuple tuple;
1952         struct nf_conntrack_expect *exp;
1953         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1954         u_int8_t u3 = nfmsg->nfgen_family;
1955         u16 zone;
1956         int err;
1957
1958         if (!cda[CTA_EXPECT_TUPLE]
1959             || !cda[CTA_EXPECT_MASK]
1960             || !cda[CTA_EXPECT_MASTER])
1961                 return -EINVAL;
1962
1963         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1964         if (err < 0)
1965                 return err;
1966
1967         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1968         if (err < 0)
1969                 return err;
1970
1971         spin_lock_bh(&nf_conntrack_lock);
1972         exp = __nf_ct_expect_find(net, zone, &tuple);
1973
1974         if (!exp) {
1975                 spin_unlock_bh(&nf_conntrack_lock);
1976                 err = -ENOENT;
1977                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1978                         err = ctnetlink_create_expect(net, zone, cda,
1979                                                       u3,
1980                                                       NETLINK_CB(skb).pid,
1981                                                       nlmsg_report(nlh));
1982                 }
1983                 return err;
1984         }
1985
1986         err = -EEXIST;
1987         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1988                 err = ctnetlink_change_expect(exp, cda);
1989         spin_unlock_bh(&nf_conntrack_lock);
1990
1991         return err;
1992 }
1993
1994 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1995 static struct nf_ct_event_notifier ctnl_notifier = {
1996         .fcn = ctnetlink_conntrack_event,
1997 };
1998
1999 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2000         .fcn = ctnetlink_expect_event,
2001 };
2002 #endif
2003
2004 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2005         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2006                                             .attr_count = CTA_MAX,
2007                                             .policy = ct_nla_policy },
2008         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2009                                             .attr_count = CTA_MAX,
2010                                             .policy = ct_nla_policy },
2011         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2012                                             .attr_count = CTA_MAX,
2013                                             .policy = ct_nla_policy },
2014         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2015                                             .attr_count = CTA_MAX,
2016                                             .policy = ct_nla_policy },
2017 };
2018
2019 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2020         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2021                                             .attr_count = CTA_EXPECT_MAX,
2022                                             .policy = exp_nla_policy },
2023         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2024                                             .attr_count = CTA_EXPECT_MAX,
2025                                             .policy = exp_nla_policy },
2026         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2027                                             .attr_count = CTA_EXPECT_MAX,
2028                                             .policy = exp_nla_policy },
2029 };
2030
2031 static const struct nfnetlink_subsystem ctnl_subsys = {
2032         .name                           = "conntrack",
2033         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2034         .cb_count                       = IPCTNL_MSG_MAX,
2035         .cb                             = ctnl_cb,
2036 };
2037
2038 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2039         .name                           = "conntrack_expect",
2040         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2041         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2042         .cb                             = ctnl_exp_cb,
2043 };
2044
2045 MODULE_ALIAS("ip_conntrack_netlink");
2046 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2047 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2048
2049 static int __init ctnetlink_init(void)
2050 {
2051         int ret;
2052
2053         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
2054         ret = nfnetlink_subsys_register(&ctnl_subsys);
2055         if (ret < 0) {
2056                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
2057                 goto err_out;
2058         }
2059
2060         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2061         if (ret < 0) {
2062                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2063                 goto err_unreg_subsys;
2064         }
2065
2066 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2067         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2068         if (ret < 0) {
2069                 printk("ctnetlink_init: cannot register notifier.\n");
2070                 goto err_unreg_exp_subsys;
2071         }
2072
2073         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2074         if (ret < 0) {
2075                 printk("ctnetlink_init: cannot expect register notifier.\n");
2076                 goto err_unreg_notifier;
2077         }
2078 #endif
2079
2080         return 0;
2081
2082 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2083 err_unreg_notifier:
2084         nf_conntrack_unregister_notifier(&ctnl_notifier);
2085 err_unreg_exp_subsys:
2086         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2087 #endif
2088 err_unreg_subsys:
2089         nfnetlink_subsys_unregister(&ctnl_subsys);
2090 err_out:
2091         return ret;
2092 }
2093
2094 static void __exit ctnetlink_exit(void)
2095 {
2096         printk("ctnetlink: unregistering from nfnetlink.\n");
2097
2098 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2099         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2100         nf_conntrack_unregister_notifier(&ctnl_notifier);
2101 #endif
2102
2103         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2104         nfnetlink_subsys_unregister(&ctnl_subsys);
2105         return;
2106 }
2107
2108 module_init(ctnetlink_init);
2109 module_exit(ctnetlink_exit);