Pileus Git - ~andy/linux/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) 2005-2011 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/security.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/errno.h>
  28 #include <linux/netlink.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/netfilter.h>
  34 #include <net/netlink.h>
  35 #include <net/sock.h>
  36 #include <net/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_core.h>
  38 #include <net/netfilter/nf_conntrack_expect.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40 #include <net/netfilter/nf_conntrack_l3proto.h>
  41 #include <net/netfilter/nf_conntrack_l4proto.h>
  42 #include <net/netfilter/nf_conntrack_tuple.h>
  43 #include <net/netfilter/nf_conntrack_acct.h>
  44 #include <net/netfilter/nf_conntrack_zones.h>
  45 #include <net/netfilter/nf_conntrack_timestamp.h>
  46 #ifdef CONFIG_NF_NAT_NEEDED
  47 #include <net/netfilter/nf_nat_core.h>
  48 #include <net/netfilter/nf_nat_protocol.h>
  49 #endif
  50
  51 #include <linux/netfilter/nfnetlink.h>
  52 #include <linux/netfilter/nfnetlink_conntrack.h>
  53
  54 MODULE_LICENSE("GPL");
  55
  56 static char __initdata version[] = "0.93";
  57
  58 static inline int
  59 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  60                             const struct nf_conntrack_tuple *tuple,
  61                             struct nf_conntrack_l4proto *l4proto)
  62 {
  63         int ret = 0;
  64         struct nlattr *nest_parms;
  65
  66         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  67         if (!nest_parms)
  68                 goto nla_put_failure;
  69         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  70                 goto nla_put_failure;
  71
  72         if (likely(l4proto->tuple_to_nlattr))
  73                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  74
  75         nla_nest_end(skb, nest_parms);
  76
  77         return ret;
  78
  79 nla_put_failure:
  80         return -1;
  81 }
  82
  83 static inline int
  84 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  85                          const struct nf_conntrack_tuple *tuple,
  86                          struct nf_conntrack_l3proto *l3proto)
  87 {
  88         int ret = 0;
  89         struct nlattr *nest_parms;
  90
  91         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  92         if (!nest_parms)
  93                 goto nla_put_failure;
  94
  95         if (likely(l3proto->tuple_to_nlattr))
  96                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  97
  98         nla_nest_end(skb, nest_parms);
  99
 100         return ret;
 101
 102 nla_put_failure:
 103         return -1;
 104 }
 105
 106 static int
 107 ctnetlink_dump_tuples(struct sk_buff *skb,
 108                       const struct nf_conntrack_tuple *tuple)
 109 {
 110         int ret;
 111         struct nf_conntrack_l3proto *l3proto;
 112         struct nf_conntrack_l4proto *l4proto;
 113
 114         rcu_read_lock();
 115         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 116         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 117
 118         if (ret >= 0) {
 119                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
 120                                                tuple->dst.protonum);
 121                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 122         }
 123         rcu_read_unlock();
 124         return ret;
 125 }
 126
 127 static inline int
 128 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 129 {
 130         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 131                 goto nla_put_failure;
 132         return 0;
 133
 134 nla_put_failure:
 135         return -1;
 136 }
 137
 138 static inline int
 139 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 140 {
 141         long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
 142
 143         if (timeout < 0)
 144                 timeout = 0;
 145
 146         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 147                 goto nla_put_failure;
 148         return 0;
 149
 150 nla_put_failure:
 151         return -1;
 152 }
 153
 154 static inline int
 155 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 156 {
 157         struct nf_conntrack_l4proto *l4proto;
 158         struct nlattr *nest_proto;
 159         int ret;
 160
 161         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 162         if (!l4proto->to_nlattr)
 163                 return 0;
 164
 165         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 166         if (!nest_proto)
 167                 goto nla_put_failure;
 168
 169         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 170
 171         nla_nest_end(skb, nest_proto);
 172
 173         return ret;
 174
 175 nla_put_failure:
 176         return -1;
 177 }
 178
 179 static inline int
 180 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 181 {
 182         struct nlattr *nest_helper;
 183         const struct nf_conn_help *help = nfct_help(ct);
 184         struct nf_conntrack_helper *helper;
 185
 186         if (!help)
 187                 return 0;
 188
 189         helper = rcu_dereference(help->helper);
 190         if (!helper)
 191                 goto out;
 192
 193         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 194         if (!nest_helper)
 195                 goto nla_put_failure;
 196         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 197                 goto nla_put_failure;
 198
 199         if (helper->to_nlattr)
 200                 helper->to_nlattr(skb, ct);
 201
 202         nla_nest_end(skb, nest_helper);
 203 out:
 204         return 0;
 205
 206 nla_put_failure:
 207         return -1;
 208 }
 209
 210 static int
 211 dump_counters(struct sk_buff *skb, u64 pkts, u64 bytes,
 212               enum ip_conntrack_dir dir)
 213 {
 214         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 215         struct nlattr *nest_count;
 216
 217         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 218         if (!nest_count)
 219                 goto nla_put_failure;
 220
 221         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
 222             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
 223                 goto nla_put_failure;
 224
 225         nla_nest_end(skb, nest_count);
 226
 227         return 0;
 228
 229 nla_put_failure:
 230         return -1;
 231 }
 232
 233 static int
 234 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 235                         enum ip_conntrack_dir dir, int type)
 236 {
 237         struct nf_conn_counter *acct;
 238         u64 pkts, bytes;
 239
 240         acct = nf_conn_acct_find(ct);
 241         if (!acct)
 242                 return 0;
 243
 244         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 245                 pkts = atomic64_xchg(&acct[dir].packets, 0);
 246                 bytes = atomic64_xchg(&acct[dir].bytes, 0);
 247         } else {
 248                 pkts = atomic64_read(&acct[dir].packets);
 249                 bytes = atomic64_read(&acct[dir].bytes);
 250         }
 251         return dump_counters(skb, pkts, bytes, dir);
 252 }
 253
 254 static int
 255 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 256 {
 257         struct nlattr *nest_count;
 258         const struct nf_conn_tstamp *tstamp;
 259
 260         tstamp = nf_conn_tstamp_find(ct);
 261         if (!tstamp)
 262                 return 0;
 263
 264         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 265         if (!nest_count)
 266                 goto nla_put_failure;
 267
 268         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
 269             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 270                                                cpu_to_be64(tstamp->stop))))
 271                 goto nla_put_failure;
 272         nla_nest_end(skb, nest_count);
 273
 274         return 0;
 275
 276 nla_put_failure:
 277         return -1;
 278 }
 279
 280 #ifdef CONFIG_NF_CONNTRACK_MARK
 281 static inline int
 282 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 283 {
 284         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 285                 goto nla_put_failure;
 286         return 0;
 287
 288 nla_put_failure:
 289         return -1;
 290 }
 291 #else
 292 #define ctnetlink_dump_mark(a, b) (0)
 293 #endif
 294
 295 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 296 static inline int
 297 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 298 {
 299         struct nlattr *nest_secctx;
 300         int len, ret;
 301         char *secctx;
 302
 303         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 304         if (ret)
 305                 return 0;
 306
 307         ret = -1;
 308         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 309         if (!nest_secctx)
 310                 goto nla_put_failure;
 311
 312         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 313                 goto nla_put_failure;
 314         nla_nest_end(skb, nest_secctx);
 315
 316         ret = 0;
 317 nla_put_failure:
 318         security_release_secctx(secctx, len);
 319         return ret;
 320 }
 321 #else
 322 #define ctnetlink_dump_secctx(a, b) (0)
 323 #endif
 324
 325 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 326
 327 static inline int
 328 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 329 {
 330         struct nlattr *nest_parms;
 331
 332         if (!(ct->status & IPS_EXPECTED))
 333                 return 0;
 334
 335         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 336         if (!nest_parms)
 337                 goto nla_put_failure;
 338         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 339                 goto nla_put_failure;
 340         nla_nest_end(skb, nest_parms);
 341
 342         return 0;
 343
 344 nla_put_failure:
 345         return -1;
 346 }
 347
 348 #ifdef CONFIG_NF_NAT_NEEDED
 349 static int
 350 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 351 {
 352         struct nlattr *nest_parms;
 353
 354         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 355         if (!nest_parms)
 356                 goto nla_put_failure;
 357
 358         if (nla_put_be32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 359                          htonl(natseq->correction_pos)) ||
 360             nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 361                          htonl(natseq->offset_before)) ||
 362             nla_put_be32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 363                          htonl(natseq->offset_after)))
 364                 goto nla_put_failure;
 365
 366         nla_nest_end(skb, nest_parms);
 367
 368         return 0;
 369
 370 nla_put_failure:
 371         return -1;
 372 }
 373
 374 static inline int
 375 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 376 {
 377         struct nf_nat_seq *natseq;
 378         struct nf_conn_nat *nat = nfct_nat(ct);
 379
 380         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 381                 return 0;
 382
 383         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 384         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 385                 return -1;
 386
 387         natseq = &nat->seq[IP_CT_DIR_REPLY];
 388         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 389                 return -1;
 390
 391         return 0;
 392 }
 393 #else
 394 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 395 #endif
 396
 397 static inline int
 398 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 399 {
 400         if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
 401                 goto nla_put_failure;
 402         return 0;
 403
 404 nla_put_failure:
 405         return -1;
 406 }
 407
 408 static inline int
 409 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 410 {
 411         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 412                 goto nla_put_failure;
 413         return 0;
 414
 415 nla_put_failure:
 416         return -1;
 417 }
 418
 419 static int
 420 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, u32 type,
 421                     struct nf_conn *ct)
 422 {
 423         struct nlmsghdr *nlh;
 424         struct nfgenmsg *nfmsg;
 425         struct nlattr *nest_parms;
 426         unsigned int flags = pid ? NLM_F_MULTI : 0, event;
 427
 428         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
 429         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 430         if (nlh == NULL)
 431                 goto nlmsg_failure;
 432
 433         nfmsg = nlmsg_data(nlh);
 434         nfmsg->nfgen_family = nf_ct_l3num(ct);
 435         nfmsg->version      = NFNETLINK_V0;
 436         nfmsg->res_id       = 0;
 437
 438         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 439         if (!nest_parms)
 440                 goto nla_put_failure;
 441         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 442                 goto nla_put_failure;
 443         nla_nest_end(skb, nest_parms);
 444
 445         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 446         if (!nest_parms)
 447                 goto nla_put_failure;
 448         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 449                 goto nla_put_failure;
 450         nla_nest_end(skb, nest_parms);
 451
 452         if (nf_ct_zone(ct) &&
 453             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 454                 goto nla_put_failure;
 455
 456         if (ctnetlink_dump_status(skb, ct) < 0 ||
 457             ctnetlink_dump_timeout(skb, ct) < 0 ||
 458             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL, type) < 0 ||
 459             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY, type) < 0 ||
 460             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 461             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 462             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 463             ctnetlink_dump_mark(skb, ct) < 0 ||
 464             ctnetlink_dump_secctx(skb, ct) < 0 ||
 465             ctnetlink_dump_id(skb, ct) < 0 ||
 466             ctnetlink_dump_use(skb, ct) < 0 ||
 467             ctnetlink_dump_master(skb, ct) < 0 ||
 468             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 469                 goto nla_put_failure;
 470
 471         nlmsg_end(skb, nlh);
 472         return skb->len;
 473
 474 nlmsg_failure:
 475 nla_put_failure:
 476         nlmsg_cancel(skb, nlh);
 477         return -1;
 478 }
 479
 480 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 481 static inline size_t
 482 ctnetlink_proto_size(const struct nf_conn *ct)
 483 {
 484         struct nf_conntrack_l3proto *l3proto;
 485         struct nf_conntrack_l4proto *l4proto;
 486         size_t len = 0;
 487
 488         rcu_read_lock();
 489         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 490         len += l3proto->nla_size;
 491
 492         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 493         len += l4proto->nla_size;
 494         rcu_read_unlock();
 495
 496         return len;
 497 }
 498
 499 static inline size_t
 500 ctnetlink_counters_size(const struct nf_conn *ct)
 501 {
 502         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 503                 return 0;
 504         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 505                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 506                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 507                ;
 508 }
 509
 510 static inline int
 511 ctnetlink_secctx_size(const struct nf_conn *ct)
 512 {
 513 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 514         int len, ret;
 515
 516         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 517         if (ret)
 518                 return 0;
 519
 520         return nla_total_size(0) /* CTA_SECCTX */
 521                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 522 #else
 523         return 0;
 524 #endif
 525 }
 526
 527 static inline size_t
 528 ctnetlink_timestamp_size(const struct nf_conn *ct)
 529 {
 530 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 531         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 532                 return 0;
 533         return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
 534 #else
 535         return 0;
 536 #endif
 537 }
 538
 539 static inline size_t
 540 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 541 {
 542         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 543                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 544                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 545                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 546                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 547                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 548                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 549                + ctnetlink_counters_size(ct)
 550                + ctnetlink_timestamp_size(ct)
 551                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 552                + nla_total_size(0) /* CTA_PROTOINFO */
 553                + nla_total_size(0) /* CTA_HELP */
 554                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 555                + ctnetlink_secctx_size(ct)
 556 #ifdef CONFIG_NF_NAT_NEEDED
 557                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 558                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 559 #endif
 560 #ifdef CONFIG_NF_CONNTRACK_MARK
 561                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 562 #endif
 563                + ctnetlink_proto_size(ct)
 564                ;
 565 }
 566
 567 static int
 568 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 569 {
 570         struct net *net;
 571         struct nlmsghdr *nlh;
 572         struct nfgenmsg *nfmsg;
 573         struct nlattr *nest_parms;
 574         struct nf_conn *ct = item->ct;
 575         struct sk_buff *skb;
 576         unsigned int type;
 577         unsigned int flags = 0, group;
 578         int err;
 579
 580         /* ignore our fake conntrack entry */
 581         if (nf_ct_is_untracked(ct))
 582                 return 0;
 583
 584         if (events & (1 << IPCT_DESTROY)) {
 585                 type = IPCTNL_MSG_CT_DELETE;
 586                 group = NFNLGRP_CONNTRACK_DESTROY;
 587         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 588                 type = IPCTNL_MSG_CT_NEW;
 589                 flags = NLM_F_CREATE|NLM_F_EXCL;
 590                 group = NFNLGRP_CONNTRACK_NEW;
 591         } else  if (events) {
 592                 type = IPCTNL_MSG_CT_NEW;
 593                 group = NFNLGRP_CONNTRACK_UPDATE;
 594         } else
 595                 return 0;
 596
 597         net = nf_ct_net(ct);
 598         if (!item->report && !nfnetlink_has_listeners(net, group))
 599                 return 0;
 600
 601         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 602         if (skb == NULL)
 603                 goto errout;
 604
 605         type |= NFNL_SUBSYS_CTNETLINK << 8;
 606         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 607         if (nlh == NULL)
 608                 goto nlmsg_failure;
 609
 610         nfmsg = nlmsg_data(nlh);
 611         nfmsg->nfgen_family = nf_ct_l3num(ct);
 612         nfmsg->version  = NFNETLINK_V0;
 613         nfmsg->res_id   = 0;
 614
 615         rcu_read_lock();
 616         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 617         if (!nest_parms)
 618                 goto nla_put_failure;
 619         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 620                 goto nla_put_failure;
 621         nla_nest_end(skb, nest_parms);
 622
 623         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 624         if (!nest_parms)
 625                 goto nla_put_failure;
 626         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 627                 goto nla_put_failure;
 628         nla_nest_end(skb, nest_parms);
 629
 630         if (nf_ct_zone(ct) &&
 631             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 632                 goto nla_put_failure;
 633
 634         if (ctnetlink_dump_id(skb, ct) < 0)
 635                 goto nla_put_failure;
 636
 637         if (ctnetlink_dump_status(skb, ct) < 0)
 638                 goto nla_put_failure;
 639
 640         if (events & (1 << IPCT_DESTROY)) {
 641                 if (ctnetlink_dump_counters(skb, ct,
 642                                             IP_CT_DIR_ORIGINAL, type) < 0 ||
 643                     ctnetlink_dump_counters(skb, ct,
 644                                             IP_CT_DIR_REPLY, type) < 0 ||
 645                     ctnetlink_dump_timestamp(skb, ct) < 0)
 646                         goto nla_put_failure;
 647         } else {
 648                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 649                         goto nla_put_failure;
 650
 651                 if (events & (1 << IPCT_PROTOINFO)
 652                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 653                         goto nla_put_failure;
 654
 655                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 656                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 657                         goto nla_put_failure;
 658
 659 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 660                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 661                     && ctnetlink_dump_secctx(skb, ct) < 0)
 662                         goto nla_put_failure;
 663 #endif
 664
 665                 if (events & (1 << IPCT_RELATED) &&
 666                     ctnetlink_dump_master(skb, ct) < 0)
 667                         goto nla_put_failure;
 668
 669                 if (events & (1 << IPCT_NATSEQADJ) &&
 670                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 671                         goto nla_put_failure;
 672         }
 673
 674 #ifdef CONFIG_NF_CONNTRACK_MARK
 675         if ((events & (1 << IPCT_MARK) || ct->mark)
 676             && ctnetlink_dump_mark(skb, ct) < 0)
 677                 goto nla_put_failure;
 678 #endif
 679         rcu_read_unlock();
 680
 681         nlmsg_end(skb, nlh);
 682         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 683                              GFP_ATOMIC);
 684         if (err == -ENOBUFS || err == -EAGAIN)
 685                 return -ENOBUFS;
 686
 687         return 0;
 688
 689 nla_put_failure:
 690         rcu_read_unlock();
 691         nlmsg_cancel(skb, nlh);
 692 nlmsg_failure:
 693         kfree_skb(skb);
 694 errout:
 695         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 696                 return -ENOBUFS;
 697
 698         return 0;
 699 }
 700 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 701
 702 static int ctnetlink_done(struct netlink_callback *cb)
 703 {
 704         if (cb->args[1])
 705                 nf_ct_put((struct nf_conn *)cb->args[1]);
 706         if (cb->data)
 707                 kfree(cb->data);
 708         return 0;
 709 }
 710
 711 struct ctnetlink_dump_filter {
 712         struct {
 713                 u_int32_t val;
 714                 u_int32_t mask;
 715         } mark;
 716 };
 717
 718 static int
 719 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 720 {
 721         struct net *net = sock_net(skb->sk);
 722         struct nf_conn *ct, *last;
 723         struct nf_conntrack_tuple_hash *h;
 724         struct hlist_nulls_node *n;
 725         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 726         u_int8_t l3proto = nfmsg->nfgen_family;
 727         int res;
 728 #ifdef CONFIG_NF_CONNTRACK_MARK
 729         const struct ctnetlink_dump_filter *filter = cb->data;
 730 #endif
 731
 732         spin_lock_bh(&nf_conntrack_lock);
 733         last = (struct nf_conn *)cb->args[1];
 734         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 735 restart:
 736                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 737                                          hnnode) {
 738                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 739                                 continue;
 740                         ct = nf_ct_tuplehash_to_ctrack(h);
 741                         /* Dump entries of a given L3 protocol number.
 742                          * If it is not specified, ie. l3proto == 0,
 743                          * then dump everything. */
 744                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 745                                 continue;
 746                         if (cb->args[1]) {
 747                                 if (ct != last)
 748                                         continue;
 749                                 cb->args[1] = 0;
 750                         }
 751 #ifdef CONFIG_NF_CONNTRACK_MARK
 752                         if (filter && !((ct->mark & filter->mark.mask) ==
 753                                         filter->mark.val)) {
 754                                 continue;
 755                         }
 756 #endif
 757                         rcu_read_lock();
 758                         res =
 759                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 760                                             cb->nlh->nlmsg_seq,
 761                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 762                                             ct);
 763                         rcu_read_unlock();
 764                         if (res < 0) {
 765                                 nf_conntrack_get(&ct->ct_general);
 766                                 cb->args[1] = (unsigned long)ct;
 767                                 goto out;
 768                         }
 769                 }
 770                 if (cb->args[1]) {
 771                         cb->args[1] = 0;
 772                         goto restart;
 773                 }
 774         }
 775 out:
 776         spin_unlock_bh(&nf_conntrack_lock);
 777         if (last)
 778                 nf_ct_put(last);
 779
 780         return skb->len;
 781 }
 782
 783 static inline int
 784 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 785 {
 786         struct nlattr *tb[CTA_IP_MAX+1];
 787         struct nf_conntrack_l3proto *l3proto;
 788         int ret = 0;
 789
 790         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 791
 792         rcu_read_lock();
 793         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 794
 795         if (likely(l3proto->nlattr_to_tuple)) {
 796                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 797                                           l3proto->nla_policy);
 798                 if (ret == 0)
 799                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 800         }
 801
 802         rcu_read_unlock();
 803
 804         return ret;
 805 }
 806
 807 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 808         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 809 };
 810
 811 static inline int
 812 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 813                             struct nf_conntrack_tuple *tuple)
 814 {
 815         struct nlattr *tb[CTA_PROTO_MAX+1];
 816         struct nf_conntrack_l4proto *l4proto;
 817         int ret = 0;
 818
 819         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 820         if (ret < 0)
 821                 return ret;
 822
 823         if (!tb[CTA_PROTO_NUM])
 824                 return -EINVAL;
 825         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 826
 827         rcu_read_lock();
 828         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 829
 830         if (likely(l4proto->nlattr_to_tuple)) {
 831                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 832                                           l4proto->nla_policy);
 833                 if (ret == 0)
 834                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 835         }
 836
 837         rcu_read_unlock();
 838
 839         return ret;
 840 }
 841
 842 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 843         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 844         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 845 };
 846
 847 static int
 848 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 849                       struct nf_conntrack_tuple *tuple,
 850                       enum ctattr_type type, u_int8_t l3num)
 851 {
 852         struct nlattr *tb[CTA_TUPLE_MAX+1];
 853         int err;
 854
 855         memset(tuple, 0, sizeof(*tuple));
 856
 857         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 858
 859         if (!tb[CTA_TUPLE_IP])
 860                 return -EINVAL;
 861
 862         tuple->src.l3num = l3num;
 863
 864         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 865         if (err < 0)
 866                 return err;
 867
 868         if (!tb[CTA_TUPLE_PROTO])
 869                 return -EINVAL;
 870
 871         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 872         if (err < 0)
 873                 return err;
 874
 875         /* orig and expect tuples get DIR_ORIGINAL */
 876         if (type == CTA_TUPLE_REPLY)
 877                 tuple->dst.dir = IP_CT_DIR_REPLY;
 878         else
 879                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 880
 881         return 0;
 882 }
 883
 884 static int
 885 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 886 {
 887         if (attr)
 888 #ifdef CONFIG_NF_CONNTRACK_ZONES
 889                 *zone = ntohs(nla_get_be16(attr));
 890 #else
 891                 return -EOPNOTSUPP;
 892 #endif
 893         else
 894                 *zone = 0;
 895
 896         return 0;
 897 }
 898
 899 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 900         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 901 };
 902
 903 static inline int
 904 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 905 {
 906         struct nlattr *tb[CTA_HELP_MAX+1];
 907
 908         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 909
 910         if (!tb[CTA_HELP_NAME])
 911                 return -EINVAL;
 912
 913         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 914
 915         return 0;
 916 }
 917
 918 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 919         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 920         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 921         [CTA_STATUS]            = { .type = NLA_U32 },
 922         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 923         [CTA_HELP]              = { .type = NLA_NESTED },
 924         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 925         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 926         [CTA_MARK]              = { .type = NLA_U32 },
 927         [CTA_ID]                = { .type = NLA_U32 },
 928         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 929         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 930         [CTA_ZONE]              = { .type = NLA_U16 },
 931         [CTA_MARK_MASK]         = { .type = NLA_U32 },
 932 };
 933
 934 static int
 935 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 936                         const struct nlmsghdr *nlh,
 937                         const struct nlattr * const cda[])
 938 {
 939         struct net *net = sock_net(ctnl);
 940         struct nf_conntrack_tuple_hash *h;
 941         struct nf_conntrack_tuple tuple;
 942         struct nf_conn *ct;
 943         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 944         u_int8_t u3 = nfmsg->nfgen_family;
 945         u16 zone;
 946         int err;
 947
 948         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 949         if (err < 0)
 950                 return err;
 951
 952         if (cda[CTA_TUPLE_ORIG])
 953                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 954         else if (cda[CTA_TUPLE_REPLY])
 955                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 956         else {
 957                 /* Flush the whole table */
 958                 nf_conntrack_flush_report(net,
 959                                          NETLINK_CB(skb).pid,
 960                                          nlmsg_report(nlh));
 961                 return 0;
 962         }
 963
 964         if (err < 0)
 965                 return err;
 966
 967         h = nf_conntrack_find_get(net, zone, &tuple);
 968         if (!h)
 969                 return -ENOENT;
 970
 971         ct = nf_ct_tuplehash_to_ctrack(h);
 972
 973         if (cda[CTA_ID]) {
 974                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 975                 if (id != (u32)(unsigned long)ct) {
 976                         nf_ct_put(ct);
 977                         return -ENOENT;
 978                 }
 979         }
 980
 981         if (del_timer(&ct->timeout)) {
 982                 if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 983                                               NETLINK_CB(skb).pid,
 984                                               nlmsg_report(nlh)) < 0) {
 985                         nf_ct_delete_from_lists(ct);
 986                         /* we failed to report the event, try later */
 987                         nf_ct_insert_dying_list(ct);
 988                         nf_ct_put(ct);
 989                         return 0;
 990                 }
 991                 /* death_by_timeout would report the event again */
 992                 set_bit(IPS_DYING_BIT, &ct->status);
 993                 nf_ct_delete_from_lists(ct);
 994                 nf_ct_put(ct);
 995         }
 996         nf_ct_put(ct);
 997
 998         return 0;
 999 }
1000
1001 static int
1002 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1003                         const struct nlmsghdr *nlh,
1004                         const struct nlattr * const cda[])
1005 {
1006         struct net *net = sock_net(ctnl);
1007         struct nf_conntrack_tuple_hash *h;
1008         struct nf_conntrack_tuple tuple;
1009         struct nf_conn *ct;
1010         struct sk_buff *skb2 = NULL;
1011         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1012         u_int8_t u3 = nfmsg->nfgen_family;
1013         u16 zone;
1014         int err;
1015
1016         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1017                 struct netlink_dump_control c = {
1018                         .dump = ctnetlink_dump_table,
1019                         .done = ctnetlink_done,
1020                 };
1021 #ifdef CONFIG_NF_CONNTRACK_MARK
1022                 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1023                         struct ctnetlink_dump_filter *filter;
1024
1025                         filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1026                                          GFP_ATOMIC);
1027                         if (filter == NULL)
1028                                 return -ENOMEM;
1029
1030                         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1031                         filter->mark.mask =
1032                                 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1033                         c.data = filter;
1034                 }
1035 #endif
1036                 return netlink_dump_start(ctnl, skb, nlh, &c);
1037         }
1038
1039         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1040         if (err < 0)
1041                 return err;
1042
1043         if (cda[CTA_TUPLE_ORIG])
1044                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1045         else if (cda[CTA_TUPLE_REPLY])
1046                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1047         else
1048                 return -EINVAL;
1049
1050         if (err < 0)
1051                 return err;
1052
1053         h = nf_conntrack_find_get(net, zone, &tuple);
1054         if (!h)
1055                 return -ENOENT;
1056
1057         ct = nf_ct_tuplehash_to_ctrack(h);
1058
1059         err = -ENOMEM;
1060         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1061         if (skb2 == NULL) {
1062                 nf_ct_put(ct);
1063                 return -ENOMEM;
1064         }
1065
1066         rcu_read_lock();
1067         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1068                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1069         rcu_read_unlock();
1070         nf_ct_put(ct);
1071         if (err <= 0)
1072                 goto free;
1073
1074         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1075         if (err < 0)
1076                 goto out;
1077
1078         return 0;
1079
1080 free:
1081         kfree_skb(skb2);
1082 out:
1083         /* this avoids a loop in nfnetlink. */
1084         return err == -EAGAIN ? -ENOBUFS : err;
1085 }
1086
1087 #ifdef CONFIG_NF_NAT_NEEDED
1088 static int
1089 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1090                           enum nf_nat_manip_type manip,
1091                           const struct nlattr *attr)
1092 {
1093         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1094
1095         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1096         if (!parse_nat_setup) {
1097 #ifdef CONFIG_MODULES
1098                 rcu_read_unlock();
1099                 nfnl_unlock();
1100                 if (request_module("nf-nat-ipv4") < 0) {
1101                         nfnl_lock();
1102                         rcu_read_lock();
1103                         return -EOPNOTSUPP;
1104                 }
1105                 nfnl_lock();
1106                 rcu_read_lock();
1107                 if (nfnetlink_parse_nat_setup_hook)
1108                         return -EAGAIN;
1109 #endif
1110                 return -EOPNOTSUPP;
1111         }
1112
1113         return parse_nat_setup(ct, manip, attr);
1114 }
1115 #endif
1116
1117 static int
1118 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1119 {
1120         unsigned long d;
1121         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1122         d = ct->status ^ status;
1123
1124         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1125                 /* unchangeable */
1126                 return -EBUSY;
1127
1128         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1129                 /* SEEN_REPLY bit can only be set */
1130                 return -EBUSY;
1131
1132         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1133                 /* ASSURED bit can only be set */
1134                 return -EBUSY;
1135
1136         /* Be careful here, modifying NAT bits can screw up things,
1137          * so don't let users modify them directly if they don't pass
1138          * nf_nat_range. */
1139         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1140         return 0;
1141 }
1142
1143 static int
1144 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1145 {
1146 #ifdef CONFIG_NF_NAT_NEEDED
1147         int ret;
1148
1149         if (cda[CTA_NAT_DST]) {
1150                 ret = ctnetlink_parse_nat_setup(ct,
1151                                                 NF_NAT_MANIP_DST,
1152                                                 cda[CTA_NAT_DST]);
1153                 if (ret < 0)
1154                         return ret;
1155         }
1156         if (cda[CTA_NAT_SRC]) {
1157                 ret = ctnetlink_parse_nat_setup(ct,
1158                                                 NF_NAT_MANIP_SRC,
1159                                                 cda[CTA_NAT_SRC]);
1160                 if (ret < 0)
1161                         return ret;
1162         }
1163         return 0;
1164 #else
1165         return -EOPNOTSUPP;
1166 #endif
1167 }
1168
1169 static inline int
1170 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1171 {
1172         struct nf_conntrack_helper *helper;
1173         struct nf_conn_help *help = nfct_help(ct);
1174         char *helpname = NULL;
1175         int err;
1176
1177         /* don't change helper of sibling connections */
1178         if (ct->master)
1179                 return -EBUSY;
1180
1181         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1182         if (err < 0)
1183                 return err;
1184
1185         if (!strcmp(helpname, "")) {
1186                 if (help && help->helper) {
1187                         /* we had a helper before ... */
1188                         nf_ct_remove_expectations(ct);
1189                         RCU_INIT_POINTER(help->helper, NULL);
1190                 }
1191
1192                 return 0;
1193         }
1194
1195         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1196                                             nf_ct_protonum(ct));
1197         if (helper == NULL) {
1198 #ifdef CONFIG_MODULES
1199                 spin_unlock_bh(&nf_conntrack_lock);
1200
1201                 if (request_module("nfct-helper-%s", helpname) < 0) {
1202                         spin_lock_bh(&nf_conntrack_lock);
1203                         return -EOPNOTSUPP;
1204                 }
1205
1206                 spin_lock_bh(&nf_conntrack_lock);
1207                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1208                                                     nf_ct_protonum(ct));
1209                 if (helper)
1210                         return -EAGAIN;
1211 #endif
1212                 return -EOPNOTSUPP;
1213         }
1214
1215         if (help) {
1216                 if (help->helper == helper)
1217                         return 0;
1218                 if (help->helper)
1219                         return -EBUSY;
1220                 /* need to zero data of old helper */
1221                 memset(&help->help, 0, sizeof(help->help));
1222         } else {
1223                 /* we cannot set a helper for an existing conntrack */
1224                 return -EOPNOTSUPP;
1225         }
1226
1227         rcu_assign_pointer(help->helper, helper);
1228
1229         return 0;
1230 }
1231
1232 static inline int
1233 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1234 {
1235         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1236
1237         if (!del_timer(&ct->timeout))
1238                 return -ETIME;
1239
1240         ct->timeout.expires = jiffies + timeout * HZ;
1241         add_timer(&ct->timeout);
1242
1243         return 0;
1244 }
1245
1246 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1247         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1248         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1249         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1250 };
1251
1252 static inline int
1253 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1254 {
1255         const struct nlattr *attr = cda[CTA_PROTOINFO];
1256         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1257         struct nf_conntrack_l4proto *l4proto;
1258         int err = 0;
1259
1260         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1261
1262         rcu_read_lock();
1263         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1264         if (l4proto->from_nlattr)
1265                 err = l4proto->from_nlattr(tb, ct);
1266         rcu_read_unlock();
1267
1268         return err;
1269 }
1270
1271 #ifdef CONFIG_NF_NAT_NEEDED
1272 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1273         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1274         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1275         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1276 };
1277
1278 static inline int
1279 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1280 {
1281         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1282
1283         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1284
1285         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1286                 return -EINVAL;
1287
1288         natseq->correction_pos =
1289                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1290
1291         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1292                 return -EINVAL;
1293
1294         natseq->offset_before =
1295                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1296
1297         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1298                 return -EINVAL;
1299
1300         natseq->offset_after =
1301                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1302
1303         return 0;
1304 }
1305
1306 static int
1307 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1308                              const struct nlattr * const cda[])
1309 {
1310         int ret = 0;
1311         struct nf_conn_nat *nat = nfct_nat(ct);
1312
1313         if (!nat)
1314                 return 0;
1315
1316         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1317                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1318                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1319                 if (ret < 0)
1320                         return ret;
1321
1322                 ct->status |= IPS_SEQ_ADJUST;
1323         }
1324
1325         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1326                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1327                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1328                 if (ret < 0)
1329                         return ret;
1330
1331                 ct->status |= IPS_SEQ_ADJUST;
1332         }
1333
1334         return 0;
1335 }
1336 #endif
1337
1338 static int
1339 ctnetlink_change_conntrack(struct nf_conn *ct,
1340                            const struct nlattr * const cda[])
1341 {
1342         int err;
1343
1344         /* only allow NAT changes and master assignation for new conntracks */
1345         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1346                 return -EOPNOTSUPP;
1347
1348         if (cda[CTA_HELP]) {
1349                 err = ctnetlink_change_helper(ct, cda);
1350                 if (err < 0)
1351                         return err;
1352         }
1353
1354         if (cda[CTA_TIMEOUT]) {
1355                 err = ctnetlink_change_timeout(ct, cda);
1356                 if (err < 0)
1357                         return err;
1358         }
1359
1360         if (cda[CTA_STATUS]) {
1361                 err = ctnetlink_change_status(ct, cda);
1362                 if (err < 0)
1363                         return err;
1364         }
1365
1366         if (cda[CTA_PROTOINFO]) {
1367                 err = ctnetlink_change_protoinfo(ct, cda);
1368                 if (err < 0)
1369                         return err;
1370         }
1371
1372 #if defined(CONFIG_NF_CONNTRACK_MARK)
1373         if (cda[CTA_MARK])
1374                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1375 #endif
1376
1377 #ifdef CONFIG_NF_NAT_NEEDED
1378         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1379                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1380                 if (err < 0)
1381                         return err;
1382         }
1383 #endif
1384
1385         return 0;
1386 }
1387
1388 static struct nf_conn *
1389 ctnetlink_create_conntrack(struct net *net, u16 zone,
1390                            const struct nlattr * const cda[],
1391                            struct nf_conntrack_tuple *otuple,
1392                            struct nf_conntrack_tuple *rtuple,
1393                            u8 u3)
1394 {
1395         struct nf_conn *ct;
1396         int err = -EINVAL;
1397         struct nf_conntrack_helper *helper;
1398         struct nf_conn_tstamp *tstamp;
1399
1400         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1401         if (IS_ERR(ct))
1402                 return ERR_PTR(-ENOMEM);
1403
1404         if (!cda[CTA_TIMEOUT])
1405                 goto err1;
1406         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1407
1408         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1409
1410         rcu_read_lock();
1411         if (cda[CTA_HELP]) {
1412                 char *helpname = NULL;
1413
1414                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1415                 if (err < 0)
1416                         goto err2;
1417
1418                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1419                                                     nf_ct_protonum(ct));
1420                 if (helper == NULL) {
1421                         rcu_read_unlock();
1422 #ifdef CONFIG_MODULES
1423                         if (request_module("nfct-helper-%s", helpname) < 0) {
1424                                 err = -EOPNOTSUPP;
1425                                 goto err1;
1426                         }
1427
1428                         rcu_read_lock();
1429                         helper = __nf_conntrack_helper_find(helpname,
1430                                                             nf_ct_l3num(ct),
1431                                                             nf_ct_protonum(ct));
1432                         if (helper) {
1433                                 err = -EAGAIN;
1434                                 goto err2;
1435                         }
1436                         rcu_read_unlock();
1437 #endif
1438                         err = -EOPNOTSUPP;
1439                         goto err1;
1440                 } else {
1441                         struct nf_conn_help *help;
1442
1443                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1444                         if (help == NULL) {
1445                                 err = -ENOMEM;
1446                                 goto err2;
1447                         }
1448
1449                         /* not in hash table yet so not strictly necessary */
1450                         RCU_INIT_POINTER(help->helper, helper);
1451                 }
1452         } else {
1453                 /* try an implicit helper assignation */
1454                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1455                 if (err < 0)
1456                         goto err2;
1457         }
1458
1459         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1460                 err = ctnetlink_change_nat(ct, cda);
1461                 if (err < 0)
1462                         goto err2;
1463         }
1464
1465         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1466         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1467         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1468         /* we must add conntrack extensions before confirmation. */
1469         ct->status |= IPS_CONFIRMED;
1470
1471         if (cda[CTA_STATUS]) {
1472                 err = ctnetlink_change_status(ct, cda);
1473                 if (err < 0)
1474                         goto err2;
1475         }
1476
1477 #ifdef CONFIG_NF_NAT_NEEDED
1478         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1479                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1480                 if (err < 0)
1481                         goto err2;
1482         }
1483 #endif
1484
1485         memset(&ct->proto, 0, sizeof(ct->proto));
1486         if (cda[CTA_PROTOINFO]) {
1487                 err = ctnetlink_change_protoinfo(ct, cda);
1488                 if (err < 0)
1489                         goto err2;
1490         }
1491
1492 #if defined(CONFIG_NF_CONNTRACK_MARK)
1493         if (cda[CTA_MARK])
1494                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1495 #endif
1496
1497         /* setup master conntrack: this is a confirmed expectation */
1498         if (cda[CTA_TUPLE_MASTER]) {
1499                 struct nf_conntrack_tuple master;
1500                 struct nf_conntrack_tuple_hash *master_h;
1501                 struct nf_conn *master_ct;
1502
1503                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1504                 if (err < 0)
1505                         goto err2;
1506
1507                 master_h = nf_conntrack_find_get(net, zone, &master);
1508                 if (master_h == NULL) {
1509                         err = -ENOENT;
1510                         goto err2;
1511                 }
1512                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1513                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1514                 ct->master = master_ct;
1515         }
1516         tstamp = nf_conn_tstamp_find(ct);
1517         if (tstamp)
1518                 tstamp->start = ktime_to_ns(ktime_get_real());
1519
1520         err = nf_conntrack_hash_check_insert(ct);
1521         if (err < 0)
1522                 goto err2;
1523
1524         rcu_read_unlock();
1525
1526         return ct;
1527
1528 err2:
1529         rcu_read_unlock();
1530 err1:
1531         nf_conntrack_free(ct);
1532         return ERR_PTR(err);
1533 }
1534
1535 static int
1536 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1537                         const struct nlmsghdr *nlh,
1538                         const struct nlattr * const cda[])
1539 {
1540         struct net *net = sock_net(ctnl);
1541         struct nf_conntrack_tuple otuple, rtuple;
1542         struct nf_conntrack_tuple_hash *h = NULL;
1543         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1544         struct nf_conn *ct;
1545         u_int8_t u3 = nfmsg->nfgen_family;
1546         u16 zone;
1547         int err;
1548
1549         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1550         if (err < 0)
1551                 return err;
1552
1553         if (cda[CTA_TUPLE_ORIG]) {
1554                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1555                 if (err < 0)
1556                         return err;
1557         }
1558
1559         if (cda[CTA_TUPLE_REPLY]) {
1560                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1561                 if (err < 0)
1562                         return err;
1563         }
1564
1565         if (cda[CTA_TUPLE_ORIG])
1566                 h = nf_conntrack_find_get(net, zone, &otuple);
1567         else if (cda[CTA_TUPLE_REPLY])
1568                 h = nf_conntrack_find_get(net, zone, &rtuple);
1569
1570         if (h == NULL) {
1571                 err = -ENOENT;
1572                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1573                         enum ip_conntrack_events events;
1574
1575                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1576                                                         &rtuple, u3);
1577                         if (IS_ERR(ct))
1578                                 return PTR_ERR(ct);
1579
1580                         err = 0;
1581                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1582                                 events = IPCT_RELATED;
1583                         else
1584                                 events = IPCT_NEW;
1585
1586                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1587                                                       (1 << IPCT_ASSURED) |
1588                                                       (1 << IPCT_HELPER) |
1589                                                       (1 << IPCT_PROTOINFO) |
1590                                                       (1 << IPCT_NATSEQADJ) |
1591                                                       (1 << IPCT_MARK) | events,
1592                                                       ct, NETLINK_CB(skb).pid,
1593                                                       nlmsg_report(nlh));
1594                         nf_ct_put(ct);
1595                 }
1596
1597                 return err;
1598         }
1599         /* implicit 'else' */
1600
1601         err = -EEXIST;
1602         ct = nf_ct_tuplehash_to_ctrack(h);
1603         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1604                 spin_lock_bh(&nf_conntrack_lock);
1605                 err = ctnetlink_change_conntrack(ct, cda);
1606                 spin_unlock_bh(&nf_conntrack_lock);
1607                 if (err == 0) {
1608                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1609                                                       (1 << IPCT_ASSURED) |
1610                                                       (1 << IPCT_HELPER) |
1611                                                       (1 << IPCT_PROTOINFO) |
1612                                                       (1 << IPCT_NATSEQADJ) |
1613                                                       (1 << IPCT_MARK),
1614                                                       ct, NETLINK_CB(skb).pid,
1615                                                       nlmsg_report(nlh));
1616                 }
1617         }
1618
1619         nf_ct_put(ct);
1620         return err;
1621 }
1622
1623 /***********************************************************************
1624  * EXPECT
1625  ***********************************************************************/
1626
1627 static inline int
1628 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1629                          const struct nf_conntrack_tuple *tuple,
1630                          enum ctattr_expect type)
1631 {
1632         struct nlattr *nest_parms;
1633
1634         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1635         if (!nest_parms)
1636                 goto nla_put_failure;
1637         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1638                 goto nla_put_failure;
1639         nla_nest_end(skb, nest_parms);
1640
1641         return 0;
1642
1643 nla_put_failure:
1644         return -1;
1645 }
1646
1647 static inline int
1648 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1649                         const struct nf_conntrack_tuple *tuple,
1650                         const struct nf_conntrack_tuple_mask *mask)
1651 {
1652         int ret;
1653         struct nf_conntrack_l3proto *l3proto;
1654         struct nf_conntrack_l4proto *l4proto;
1655         struct nf_conntrack_tuple m;
1656         struct nlattr *nest_parms;
1657
1658         memset(&m, 0xFF, sizeof(m));
1659         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1660         m.src.u.all = mask->src.u.all;
1661         m.dst.protonum = tuple->dst.protonum;
1662
1663         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1664         if (!nest_parms)
1665                 goto nla_put_failure;
1666
1667         rcu_read_lock();
1668         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1669         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1670         if (ret >= 0) {
1671                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
1672                                                tuple->dst.protonum);
1673         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1674         }
1675         rcu_read_unlock();
1676
1677         if (unlikely(ret < 0))
1678                 goto nla_put_failure;
1679
1680         nla_nest_end(skb, nest_parms);
1681
1682         return 0;
1683
1684 nla_put_failure:
1685         return -1;
1686 }
1687
1688 static int
1689 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1690                           const struct nf_conntrack_expect *exp)
1691 {
1692         struct nf_conn *master = exp->master;
1693         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
1694         struct nf_conn_help *help;
1695 #ifdef CONFIG_NF_NAT_NEEDED
1696         struct nlattr *nest_parms;
1697         struct nf_conntrack_tuple nat_tuple = {};
1698 #endif
1699         struct nf_ct_helper_expectfn *expfn;
1700
1701         if (timeout < 0)
1702                 timeout = 0;
1703
1704         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1705                 goto nla_put_failure;
1706         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1707                 goto nla_put_failure;
1708         if (ctnetlink_exp_dump_tuple(skb,
1709                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1710                                  CTA_EXPECT_MASTER) < 0)
1711                 goto nla_put_failure;
1712
1713 #ifdef CONFIG_NF_NAT_NEEDED
1714         if (exp->saved_ip || exp->saved_proto.all) {
1715                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
1716                 if (!nest_parms)
1717                         goto nla_put_failure;
1718
1719                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
1720                         goto nla_put_failure;
1721
1722                 nat_tuple.src.l3num = nf_ct_l3num(master);
1723                 nat_tuple.src.u3.ip = exp->saved_ip;
1724                 nat_tuple.dst.protonum = nf_ct_protonum(master);
1725                 nat_tuple.src.u = exp->saved_proto;
1726
1727                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
1728                                                 CTA_EXPECT_NAT_TUPLE) < 0)
1729                         goto nla_put_failure;
1730                 nla_nest_end(skb, nest_parms);
1731         }
1732 #endif
1733         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
1734             nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
1735             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
1736             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
1737                 goto nla_put_failure;
1738         help = nfct_help(master);
1739         if (help) {
1740                 struct nf_conntrack_helper *helper;
1741
1742                 helper = rcu_dereference(help->helper);
1743                 if (helper &&
1744                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
1745                         goto nla_put_failure;
1746         }
1747         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
1748         if (expfn != NULL &&
1749             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
1750                 goto nla_put_failure;
1751
1752         return 0;
1753
1754 nla_put_failure:
1755         return -1;
1756 }
1757
1758 static int
1759 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1760                         int event, const struct nf_conntrack_expect *exp)
1761 {
1762         struct nlmsghdr *nlh;
1763         struct nfgenmsg *nfmsg;
1764         unsigned int flags = pid ? NLM_F_MULTI : 0;
1765
1766         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1767         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1768         if (nlh == NULL)
1769                 goto nlmsg_failure;
1770
1771         nfmsg = nlmsg_data(nlh);
1772         nfmsg->nfgen_family = exp->tuple.src.l3num;
1773         nfmsg->version      = NFNETLINK_V0;
1774         nfmsg->res_id       = 0;
1775
1776         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1777                 goto nla_put_failure;
1778
1779         nlmsg_end(skb, nlh);
1780         return skb->len;
1781
1782 nlmsg_failure:
1783 nla_put_failure:
1784         nlmsg_cancel(skb, nlh);
1785         return -1;
1786 }
1787
1788 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1789 static int
1790 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1791 {
1792         struct nf_conntrack_expect *exp = item->exp;
1793         struct net *net = nf_ct_exp_net(exp);
1794         struct nlmsghdr *nlh;
1795         struct nfgenmsg *nfmsg;
1796         struct sk_buff *skb;
1797         unsigned int type, group;
1798         int flags = 0;
1799
1800         if (events & (1 << IPEXP_DESTROY)) {
1801                 type = IPCTNL_MSG_EXP_DELETE;
1802                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1803         } else if (events & (1 << IPEXP_NEW)) {
1804                 type = IPCTNL_MSG_EXP_NEW;
1805                 flags = NLM_F_CREATE|NLM_F_EXCL;
1806                 group = NFNLGRP_CONNTRACK_EXP_NEW;
1807         } else
1808                 return 0;
1809
1810         if (!item->report && !nfnetlink_has_listeners(net, group))
1811                 return 0;
1812
1813         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1814         if (skb == NULL)
1815                 goto errout;
1816
1817         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1818         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1819         if (nlh == NULL)
1820                 goto nlmsg_failure;
1821
1822         nfmsg = nlmsg_data(nlh);
1823         nfmsg->nfgen_family = exp->tuple.src.l3num;
1824         nfmsg->version      = NFNETLINK_V0;
1825         nfmsg->res_id       = 0;
1826
1827         rcu_read_lock();
1828         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1829                 goto nla_put_failure;
1830         rcu_read_unlock();
1831
1832         nlmsg_end(skb, nlh);
1833         nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1834         return 0;
1835
1836 nla_put_failure:
1837         rcu_read_unlock();
1838         nlmsg_cancel(skb, nlh);
1839 nlmsg_failure:
1840         kfree_skb(skb);
1841 errout:
1842         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1843         return 0;
1844 }
1845 #endif
1846 static int ctnetlink_exp_done(struct netlink_callback *cb)
1847 {
1848         if (cb->args[1])
1849                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1850         return 0;
1851 }
1852
1853 static int
1854 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1855 {
1856         struct net *net = sock_net(skb->sk);
1857         struct nf_conntrack_expect *exp, *last;
1858         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1859         struct hlist_node *n;
1860         u_int8_t l3proto = nfmsg->nfgen_family;
1861
1862         rcu_read_lock();
1863         last = (struct nf_conntrack_expect *)cb->args[1];
1864         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1865 restart:
1866                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1867                                      hnode) {
1868                         if (l3proto && exp->tuple.src.l3num != l3proto)
1869                                 continue;
1870                         if (cb->args[1]) {
1871                                 if (exp != last)
1872                                         continue;
1873                                 cb->args[1] = 0;
1874                         }
1875                         if (ctnetlink_exp_fill_info(skb,
1876                                                     NETLINK_CB(cb->skb).pid,
1877                                                     cb->nlh->nlmsg_seq,
1878                                                     IPCTNL_MSG_EXP_NEW,
1879                                                     exp) < 0) {
1880                                 if (!atomic_inc_not_zero(&exp->use))
1881                                         continue;
1882                                 cb->args[1] = (unsigned long)exp;
1883                                 goto out;
1884                         }
1885                 }
1886                 if (cb->args[1]) {
1887                         cb->args[1] = 0;
1888                         goto restart;
1889                 }
1890         }
1891 out:
1892         rcu_read_unlock();
1893         if (last)
1894                 nf_ct_expect_put(last);
1895
1896         return skb->len;
1897 }
1898
1899 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1900         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1901         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1902         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1903         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1904         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1905         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1906         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1907         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1908         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
1909         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
1910         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
1911 };
1912
1913 static int
1914 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1915                      const struct nlmsghdr *nlh,
1916                      const struct nlattr * const cda[])
1917 {
1918         struct net *net = sock_net(ctnl);
1919         struct nf_conntrack_tuple tuple;
1920         struct nf_conntrack_expect *exp;
1921         struct sk_buff *skb2;
1922         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1923         u_int8_t u3 = nfmsg->nfgen_family;
1924         u16 zone;
1925         int err;
1926
1927         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1928                 struct netlink_dump_control c = {
1929                         .dump = ctnetlink_exp_dump_table,
1930                         .done = ctnetlink_exp_done,
1931                 };
1932                 return netlink_dump_start(ctnl, skb, nlh, &c);
1933         }
1934
1935         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1936         if (err < 0)
1937                 return err;
1938
1939         if (cda[CTA_EXPECT_TUPLE])
1940                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1941         else if (cda[CTA_EXPECT_MASTER])
1942                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1943         else
1944                 return -EINVAL;
1945
1946         if (err < 0)
1947                 return err;
1948
1949         exp = nf_ct_expect_find_get(net, zone, &tuple);
1950         if (!exp)
1951                 return -ENOENT;
1952
1953         if (cda[CTA_EXPECT_ID]) {
1954                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1955                 if (ntohl(id) != (u32)(unsigned long)exp) {
1956                         nf_ct_expect_put(exp);
1957                         return -ENOENT;
1958                 }
1959         }
1960
1961         err = -ENOMEM;
1962         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1963         if (skb2 == NULL) {
1964                 nf_ct_expect_put(exp);
1965                 goto out;
1966         }
1967
1968         rcu_read_lock();
1969         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1970                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1971         rcu_read_unlock();
1972         nf_ct_expect_put(exp);
1973         if (err <= 0)
1974                 goto free;
1975
1976         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1977         if (err < 0)
1978                 goto out;
1979
1980         return 0;
1981
1982 free:
1983         kfree_skb(skb2);
1984 out:
1985         /* this avoids a loop in nfnetlink. */
1986         return err == -EAGAIN ? -ENOBUFS : err;
1987 }
1988
1989 static int
1990 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1991                      const struct nlmsghdr *nlh,
1992                      const struct nlattr * const cda[])
1993 {
1994         struct net *net = sock_net(ctnl);
1995         struct nf_conntrack_expect *exp;
1996         struct nf_conntrack_tuple tuple;
1997         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1998         struct hlist_node *n, *next;
1999         u_int8_t u3 = nfmsg->nfgen_family;
2000         unsigned int i;
2001         u16 zone;
2002         int err;
2003
2004         if (cda[CTA_EXPECT_TUPLE]) {
2005                 /* delete a single expect by tuple */
2006                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2007                 if (err < 0)
2008                         return err;
2009
2010                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2011                 if (err < 0)
2012                         return err;
2013
2014                 /* bump usage count to 2 */
2015                 exp = nf_ct_expect_find_get(net, zone, &tuple);
2016                 if (!exp)
2017                         return -ENOENT;
2018
2019                 if (cda[CTA_EXPECT_ID]) {
2020                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2021                         if (ntohl(id) != (u32)(unsigned long)exp) {
2022                                 nf_ct_expect_put(exp);
2023                                 return -ENOENT;
2024                         }
2025                 }
2026
2027                 /* after list removal, usage count == 1 */
2028                 spin_lock_bh(&nf_conntrack_lock);
2029                 if (del_timer(&exp->timeout)) {
2030                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
2031                                                    nlmsg_report(nlh));
2032                         nf_ct_expect_put(exp);
2033                 }
2034                 spin_unlock_bh(&nf_conntrack_lock);
2035                 /* have to put what we 'get' above.
2036                  * after this line usage count == 0 */
2037                 nf_ct_expect_put(exp);
2038         } else if (cda[CTA_EXPECT_HELP_NAME]) {
2039                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2040                 struct nf_conn_help *m_help;
2041
2042                 /* delete all expectations for this helper */
2043                 spin_lock_bh(&nf_conntrack_lock);
2044                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2045                         hlist_for_each_entry_safe(exp, n, next,
2046                                                   &net->ct.expect_hash[i],
2047                                                   hnode) {
2048                                 m_help = nfct_help(exp->master);
2049                                 if (!strcmp(m_help->helper->name, name) &&
2050                                     del_timer(&exp->timeout)) {
2051                                         nf_ct_unlink_expect_report(exp,
2052                                                         NETLINK_CB(skb).pid,
2053                                                         nlmsg_report(nlh));
2054                                         nf_ct_expect_put(exp);
2055                                 }
2056                         }
2057                 }
2058                 spin_unlock_bh(&nf_conntrack_lock);
2059         } else {
2060                 /* This basically means we have to flush everything*/
2061                 spin_lock_bh(&nf_conntrack_lock);
2062                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2063                         hlist_for_each_entry_safe(exp, n, next,
2064                                                   &net->ct.expect_hash[i],
2065                                                   hnode) {
2066                                 if (del_timer(&exp->timeout)) {
2067                                         nf_ct_unlink_expect_report(exp,
2068                                                         NETLINK_CB(skb).pid,
2069                                                         nlmsg_report(nlh));
2070                                         nf_ct_expect_put(exp);
2071                                 }
2072                         }
2073                 }
2074                 spin_unlock_bh(&nf_conntrack_lock);
2075         }
2076
2077         return 0;
2078 }
2079 static int
2080 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2081                         const struct nlattr * const cda[])
2082 {
2083         if (cda[CTA_EXPECT_TIMEOUT]) {
2084                 if (!del_timer(&x->timeout))
2085                         return -ETIME;
2086
2087                 x->timeout.expires = jiffies +
2088                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2089                 add_timer(&x->timeout);
2090         }
2091         return 0;
2092 }
2093
2094 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2095         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
2096         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
2097 };
2098
2099 static int
2100 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2101                            struct nf_conntrack_expect *exp,
2102                            u_int8_t u3)
2103 {
2104 #ifdef CONFIG_NF_NAT_NEEDED
2105         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2106         struct nf_conntrack_tuple nat_tuple = {};
2107         int err;
2108
2109         nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2110
2111         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2112                 return -EINVAL;
2113
2114         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2115                                         &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2116         if (err < 0)
2117                 return err;
2118
2119         exp->saved_ip = nat_tuple.src.u3.ip;
2120         exp->saved_proto = nat_tuple.src.u;
2121         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2122
2123         return 0;
2124 #else
2125         return -EOPNOTSUPP;
2126 #endif
2127 }
2128
2129 static int
2130 ctnetlink_create_expect(struct net *net, u16 zone,
2131                         const struct nlattr * const cda[],
2132                         u_int8_t u3,
2133                         u32 pid, int report)
2134 {
2135         struct nf_conntrack_tuple tuple, mask, master_tuple;
2136         struct nf_conntrack_tuple_hash *h = NULL;
2137         struct nf_conntrack_expect *exp;
2138         struct nf_conn *ct;
2139         struct nf_conn_help *help;
2140         struct nf_conntrack_helper *helper = NULL;
2141         u_int32_t class = 0;
2142         int err = 0;
2143
2144         /* caller guarantees that those three CTA_EXPECT_* exist */
2145         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2146         if (err < 0)
2147                 return err;
2148         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2149         if (err < 0)
2150                 return err;
2151         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2152         if (err < 0)
2153                 return err;
2154
2155         /* Look for master conntrack of this expectation */
2156         h = nf_conntrack_find_get(net, zone, &master_tuple);
2157         if (!h)
2158                 return -ENOENT;
2159         ct = nf_ct_tuplehash_to_ctrack(h);
2160
2161         /* Look for helper of this expectation */
2162         if (cda[CTA_EXPECT_HELP_NAME]) {
2163                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2164
2165                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2166                                                     nf_ct_protonum(ct));
2167                 if (helper == NULL) {
2168 #ifdef CONFIG_MODULES
2169                         if (request_module("nfct-helper-%s", helpname) < 0) {
2170                                 err = -EOPNOTSUPP;
2171                                 goto out;
2172                         }
2173
2174                         helper = __nf_conntrack_helper_find(helpname,
2175                                                             nf_ct_l3num(ct),
2176                                                             nf_ct_protonum(ct));
2177                         if (helper) {
2178                                 err = -EAGAIN;
2179                                 goto out;
2180                         }
2181 #endif
2182                         err = -EOPNOTSUPP;
2183                         goto out;
2184                 }
2185         }
2186
2187         if (cda[CTA_EXPECT_CLASS] && helper) {
2188                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2189                 if (class > helper->expect_class_max) {
2190                         err = -EINVAL;
2191                         goto out;
2192                 }
2193         }
2194         exp = nf_ct_expect_alloc(ct);
2195         if (!exp) {
2196                 err = -ENOMEM;
2197                 goto out;
2198         }
2199         help = nfct_help(ct);
2200         if (!help) {
2201                 if (!cda[CTA_EXPECT_TIMEOUT]) {
2202                         err = -EINVAL;
2203                         goto out;
2204                 }
2205                 exp->timeout.expires =
2206                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2207
2208                 exp->flags = NF_CT_EXPECT_USERSPACE;
2209                 if (cda[CTA_EXPECT_FLAGS]) {
2210                         exp->flags |=
2211                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2212                 }
2213         } else {
2214                 if (cda[CTA_EXPECT_FLAGS]) {
2215                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2216                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2217                 } else
2218                         exp->flags = 0;
2219         }
2220         if (cda[CTA_EXPECT_FN]) {
2221                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2222                 struct nf_ct_helper_expectfn *expfn;
2223
2224                 expfn = nf_ct_helper_expectfn_find_by_name(name);
2225                 if (expfn == NULL) {
2226                         err = -EINVAL;
2227                         goto err_out;
2228                 }
2229                 exp->expectfn = expfn->expectfn;
2230         } else
2231                 exp->expectfn = NULL;
2232
2233         exp->class = class;
2234         exp->master = ct;
2235         exp->helper = helper;
2236         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2237         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2238         exp->mask.src.u.all = mask.src.u.all;
2239
2240         if (cda[CTA_EXPECT_NAT]) {
2241                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2242                                                  exp, u3);
2243                 if (err < 0)
2244                         goto err_out;
2245         }
2246         err = nf_ct_expect_related_report(exp, pid, report);
2247 err_out:
2248         nf_ct_expect_put(exp);
2249 out:
2250         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2251         return err;
2252 }
2253
2254 static int
2255 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2256                      const struct nlmsghdr *nlh,
2257                      const struct nlattr * const cda[])
2258 {
2259         struct net *net = sock_net(ctnl);
2260         struct nf_conntrack_tuple tuple;
2261         struct nf_conntrack_expect *exp;
2262         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2263         u_int8_t u3 = nfmsg->nfgen_family;
2264         u16 zone;
2265         int err;
2266
2267         if (!cda[CTA_EXPECT_TUPLE]
2268             || !cda[CTA_EXPECT_MASK]
2269             || !cda[CTA_EXPECT_MASTER])
2270                 return -EINVAL;
2271
2272         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2273         if (err < 0)
2274                 return err;
2275
2276         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2277         if (err < 0)
2278                 return err;
2279
2280         spin_lock_bh(&nf_conntrack_lock);
2281         exp = __nf_ct_expect_find(net, zone, &tuple);
2282
2283         if (!exp) {
2284                 spin_unlock_bh(&nf_conntrack_lock);
2285                 err = -ENOENT;
2286                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2287                         err = ctnetlink_create_expect(net, zone, cda,
2288                                                       u3,
2289                                                       NETLINK_CB(skb).pid,
2290                                                       nlmsg_report(nlh));
2291                 }
2292                 return err;
2293         }
2294
2295         err = -EEXIST;
2296         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2297                 err = ctnetlink_change_expect(exp, cda);
2298         spin_unlock_bh(&nf_conntrack_lock);
2299
2300         return err;
2301 }
2302
2303 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2304 static struct nf_ct_event_notifier ctnl_notifier = {
2305         .fcn = ctnetlink_conntrack_event,
2306 };
2307
2308 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2309         .fcn = ctnetlink_expect_event,
2310 };
2311 #endif
2312
2313 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2314         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2315                                             .attr_count = CTA_MAX,
2316                                             .policy = ct_nla_policy },
2317         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2318                                             .attr_count = CTA_MAX,
2319                                             .policy = ct_nla_policy },
2320         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2321                                             .attr_count = CTA_MAX,
2322                                             .policy = ct_nla_policy },
2323         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2324                                             .attr_count = CTA_MAX,
2325                                             .policy = ct_nla_policy },
2326 };
2327
2328 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2329         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2330                                             .attr_count = CTA_EXPECT_MAX,
2331                                             .policy = exp_nla_policy },
2332         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2333                                             .attr_count = CTA_EXPECT_MAX,
2334                                             .policy = exp_nla_policy },
2335         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2336                                             .attr_count = CTA_EXPECT_MAX,
2337                                             .policy = exp_nla_policy },
2338 };
2339
2340 static const struct nfnetlink_subsystem ctnl_subsys = {
2341         .name                           = "conntrack",
2342         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2343         .cb_count                       = IPCTNL_MSG_MAX,
2344         .cb                             = ctnl_cb,
2345 };
2346
2347 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2348         .name                           = "conntrack_expect",
2349         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2350         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2351         .cb                             = ctnl_exp_cb,
2352 };
2353
2354 MODULE_ALIAS("ip_conntrack_netlink");
2355 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2356 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2357
2358 static int __net_init ctnetlink_net_init(struct net *net)
2359 {
2360 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2361         int ret;
2362
2363         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
2364         if (ret < 0) {
2365                 pr_err("ctnetlink_init: cannot register notifier.\n");
2366                 goto err_out;
2367         }
2368
2369         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
2370         if (ret < 0) {
2371                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2372                 goto err_unreg_notifier;
2373         }
2374 #endif
2375         return 0;
2376
2377 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2378 err_unreg_notifier:
2379         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2380 err_out:
2381         return ret;
2382 #endif
2383 }
2384
2385 static void ctnetlink_net_exit(struct net *net)
2386 {
2387 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2388         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
2389         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
2390 #endif
2391 }
2392
2393 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
2394 {
2395         struct net *net;
2396
2397         list_for_each_entry(net, net_exit_list, exit_list)
2398                 ctnetlink_net_exit(net);
2399 }
2400
2401 static struct pernet_operations ctnetlink_net_ops = {
2402         .init           = ctnetlink_net_init,
2403         .exit_batch     = ctnetlink_net_exit_batch,
2404 };
2405
2406 static int __init ctnetlink_init(void)
2407 {
2408         int ret;
2409
2410         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2411         ret = nfnetlink_subsys_register(&ctnl_subsys);
2412         if (ret < 0) {
2413                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2414                 goto err_out;
2415         }
2416
2417         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2418         if (ret < 0) {
2419                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2420                 goto err_unreg_subsys;
2421         }
2422
2423         if (register_pernet_subsys(&ctnetlink_net_ops)) {
2424                 pr_err("ctnetlink_init: cannot register pernet operations\n");
2425                 goto err_unreg_exp_subsys;
2426         }
2427
2428         return 0;
2429
2430 err_unreg_exp_subsys:
2431         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2432 err_unreg_subsys:
2433         nfnetlink_subsys_unregister(&ctnl_subsys);
2434 err_out:
2435         return ret;
2436 }
2437
2438 static void __exit ctnetlink_exit(void)
2439 {
2440         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2441
2442         unregister_pernet_subsys(&ctnetlink_net_ops);
2443         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2444         nfnetlink_subsys_unregister(&ctnl_subsys);
2445 }
2446
2447 module_init(ctnetlink_init);
2448 module_exit(ctnetlink_exit);