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

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/rculist.h>
  22 #include <linux/rculist_nulls.h>
  23 #include <linux/types.h>
  24 #include <linux/timer.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/errno.h>
  27 #include <linux/netlink.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/notifier.h>
  31
  32 #include <linux/netfilter.h>
  33 #include <net/netlink.h>
  34 #include <net/netfilter/nf_conntrack.h>
  35 #include <net/netfilter/nf_conntrack_core.h>
  36 #include <net/netfilter/nf_conntrack_expect.h>
  37 #include <net/netfilter/nf_conntrack_helper.h>
  38 #include <net/netfilter/nf_conntrack_l3proto.h>
  39 #include <net/netfilter/nf_conntrack_l4proto.h>
  40 #include <net/netfilter/nf_conntrack_tuple.h>
  41 #include <net/netfilter/nf_conntrack_acct.h>
  42 #ifdef CONFIG_NF_NAT_NEEDED
  43 #include <net/netfilter/nf_nat_core.h>
  44 #include <net/netfilter/nf_nat_protocol.h>
  45 #endif
  46
  47 #include <linux/netfilter/nfnetlink.h>
  48 #include <linux/netfilter/nfnetlink_conntrack.h>
  49
  50 MODULE_LICENSE("GPL");
  51
  52 static char __initdata version[] = "0.93";
  53
  54 static inline int
  55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  56                             const struct nf_conntrack_tuple *tuple,
  57                             struct nf_conntrack_l4proto *l4proto)
  58 {
  59         int ret = 0;
  60         struct nlattr *nest_parms;
  61
  62         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  63         if (!nest_parms)
  64                 goto nla_put_failure;
  65         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  66
  67         if (likely(l4proto->tuple_to_nlattr))
  68                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  69
  70         nla_nest_end(skb, nest_parms);
  71
  72         return ret;
  73
  74 nla_put_failure:
  75         return -1;
  76 }
  77
  78 static inline int
  79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  80                          const struct nf_conntrack_tuple *tuple,
  81                          struct nf_conntrack_l3proto *l3proto)
  82 {
  83         int ret = 0;
  84         struct nlattr *nest_parms;
  85
  86         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  87         if (!nest_parms)
  88                 goto nla_put_failure;
  89
  90         if (likely(l3proto->tuple_to_nlattr))
  91                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  92
  93         nla_nest_end(skb, nest_parms);
  94
  95         return ret;
  96
  97 nla_put_failure:
  98         return -1;
  99 }
 100
 101 static int
 102 ctnetlink_dump_tuples(struct sk_buff *skb,
 103                       const struct nf_conntrack_tuple *tuple)
 104 {
 105         int ret;
 106         struct nf_conntrack_l3proto *l3proto;
 107         struct nf_conntrack_l4proto *l4proto;
 108
 109         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 110         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 111
 112         if (unlikely(ret < 0))
 113                 return ret;
 114
 115         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 116         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 117
 118         return ret;
 119 }
 120
 121 static inline int
 122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 123 {
 124         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 125         return 0;
 126
 127 nla_put_failure:
 128         return -1;
 129 }
 130
 131 static inline int
 132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 133 {
 134         long timeout = (ct->timeout.expires - jiffies) / HZ;
 135
 136         if (timeout < 0)
 137                 timeout = 0;
 138
 139         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 140         return 0;
 141
 142 nla_put_failure:
 143         return -1;
 144 }
 145
 146 static inline int
 147 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 148 {
 149         struct nf_conntrack_l4proto *l4proto;
 150         struct nlattr *nest_proto;
 151         int ret;
 152
 153         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 154         if (!l4proto->to_nlattr)
 155                 return 0;
 156
 157         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 158         if (!nest_proto)
 159                 goto nla_put_failure;
 160
 161         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 162
 163         nla_nest_end(skb, nest_proto);
 164
 165         return ret;
 166
 167 nla_put_failure:
 168         return -1;
 169 }
 170
 171 static inline int
 172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 173 {
 174         struct nlattr *nest_helper;
 175         const struct nf_conn_help *help = nfct_help(ct);
 176         struct nf_conntrack_helper *helper;
 177
 178         if (!help)
 179                 return 0;
 180
 181         helper = rcu_dereference(help->helper);
 182         if (!helper)
 183                 goto out;
 184
 185         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 186         if (!nest_helper)
 187                 goto nla_put_failure;
 188         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 189
 190         if (helper->to_nlattr)
 191                 helper->to_nlattr(skb, ct);
 192
 193         nla_nest_end(skb, nest_helper);
 194 out:
 195         return 0;
 196
 197 nla_put_failure:
 198         return -1;
 199 }
 200
 201 static int
 202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 203                         enum ip_conntrack_dir dir)
 204 {
 205         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 206         struct nlattr *nest_count;
 207         const struct nf_conn_counter *acct;
 208
 209         acct = nf_conn_acct_find(ct);
 210         if (!acct)
 211                 return 0;
 212
 213         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 214         if (!nest_count)
 215                 goto nla_put_failure;
 216
 217         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 218                      cpu_to_be64(acct[dir].packets));
 219         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 220                      cpu_to_be64(acct[dir].bytes));
 221
 222         nla_nest_end(skb, nest_count);
 223
 224         return 0;
 225
 226 nla_put_failure:
 227         return -1;
 228 }
 229
 230 #ifdef CONFIG_NF_CONNTRACK_MARK
 231 static inline int
 232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 233 {
 234         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 235         return 0;
 236
 237 nla_put_failure:
 238         return -1;
 239 }
 240 #else
 241 #define ctnetlink_dump_mark(a, b) (0)
 242 #endif
 243
 244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 245 static inline int
 246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 247 {
 248         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 249         return 0;
 250
 251 nla_put_failure:
 252         return -1;
 253 }
 254 #else
 255 #define ctnetlink_dump_secmark(a, b) (0)
 256 #endif
 257
 258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 259
 260 static inline int
 261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 262 {
 263         struct nlattr *nest_parms;
 264
 265         if (!(ct->status & IPS_EXPECTED))
 266                 return 0;
 267
 268         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 269         if (!nest_parms)
 270                 goto nla_put_failure;
 271         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 272                 goto nla_put_failure;
 273         nla_nest_end(skb, nest_parms);
 274
 275         return 0;
 276
 277 nla_put_failure:
 278         return -1;
 279 }
 280
 281 #ifdef CONFIG_NF_NAT_NEEDED
 282 static int
 283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 284 {
 285         struct nlattr *nest_parms;
 286
 287         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 288         if (!nest_parms)
 289                 goto nla_put_failure;
 290
 291         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 292                      htonl(natseq->correction_pos));
 293         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 294                      htonl(natseq->offset_before));
 295         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 296                      htonl(natseq->offset_after));
 297
 298         nla_nest_end(skb, nest_parms);
 299
 300         return 0;
 301
 302 nla_put_failure:
 303         return -1;
 304 }
 305
 306 static inline int
 307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 308 {
 309         struct nf_nat_seq *natseq;
 310         struct nf_conn_nat *nat = nfct_nat(ct);
 311
 312         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 313                 return 0;
 314
 315         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 316         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 317                 return -1;
 318
 319         natseq = &nat->seq[IP_CT_DIR_REPLY];
 320         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 321                 return -1;
 322
 323         return 0;
 324 }
 325 #else
 326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 327 #endif
 328
 329 static inline int
 330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 331 {
 332         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 333         return 0;
 334
 335 nla_put_failure:
 336         return -1;
 337 }
 338
 339 static inline int
 340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 341 {
 342         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 343         return 0;
 344
 345 nla_put_failure:
 346         return -1;
 347 }
 348
 349 static int
 350 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 351                     int event, const struct nf_conn *ct)
 352 {
 353         struct nlmsghdr *nlh;
 354         struct nfgenmsg *nfmsg;
 355         struct nlattr *nest_parms;
 356         unsigned char *b = skb_tail_pointer(skb);
 357
 358         event |= NFNL_SUBSYS_CTNETLINK << 8;
 359         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 360         nfmsg  = NLMSG_DATA(nlh);
 361
 362         nlh->nlmsg_flags    = pid ? NLM_F_MULTI : 0;
 363         nfmsg->nfgen_family = nf_ct_l3num(ct);
 364         nfmsg->version      = NFNETLINK_V0;
 365         nfmsg->res_id       = 0;
 366
 367         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 368         if (!nest_parms)
 369                 goto nla_put_failure;
 370         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 371                 goto nla_put_failure;
 372         nla_nest_end(skb, nest_parms);
 373
 374         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 375         if (!nest_parms)
 376                 goto nla_put_failure;
 377         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 378                 goto nla_put_failure;
 379         nla_nest_end(skb, nest_parms);
 380
 381         if (ctnetlink_dump_status(skb, ct) < 0 ||
 382             ctnetlink_dump_timeout(skb, ct) < 0 ||
 383             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 384             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 385             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 386             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 387             ctnetlink_dump_mark(skb, ct) < 0 ||
 388             ctnetlink_dump_secmark(skb, ct) < 0 ||
 389             ctnetlink_dump_id(skb, ct) < 0 ||
 390             ctnetlink_dump_use(skb, ct) < 0 ||
 391             ctnetlink_dump_master(skb, ct) < 0 ||
 392             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 393                 goto nla_put_failure;
 394
 395         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 396         return skb->len;
 397
 398 nlmsg_failure:
 399 nla_put_failure:
 400         nlmsg_trim(skb, b);
 401         return -1;
 402 }
 403
 404 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 405 /*
 406  * The general structure of a ctnetlink event is
 407  *
 408  *  CTA_TUPLE_ORIG
 409  *    <l3/l4-proto-attributes>
 410  *  CTA_TUPLE_REPLY
 411  *    <l3/l4-proto-attributes>
 412  *  CTA_ID
 413  *  ...
 414  *  CTA_PROTOINFO
 415  *    <l4-proto-attributes>
 416  *  CTA_TUPLE_MASTER
 417  *    <l3/l4-proto-attributes>
 418  *
 419  * Therefore the formular is
 420  *
 421  *   size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
 422  *              + sizeof(protoinfo_nlas)
 423  */
 424 static struct sk_buff *
 425 ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
 426 {
 427         struct nf_conntrack_l3proto *l3proto;
 428         struct nf_conntrack_l4proto *l4proto;
 429         int len;
 430
 431 #define NLA_TYPE_SIZE(type)             nla_total_size(sizeof(type))
 432
 433         /* proto independant part */
 434         len = NLMSG_SPACE(sizeof(struct nfgenmsg))
 435                 + 3 * nla_total_size(0)         /* CTA_TUPLE_ORIG|REPL|MASTER */
 436                 + 3 * nla_total_size(0)         /* CTA_TUPLE_IP */
 437                 + 3 * nla_total_size(0)         /* CTA_TUPLE_PROTO */
 438                 + 3 * NLA_TYPE_SIZE(u_int8_t)   /* CTA_PROTO_NUM */
 439                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_ID */
 440                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_STATUS */
 441 #ifdef CONFIG_NF_CT_ACCT
 442                 + 2 * nla_total_size(0)         /* CTA_COUNTERS_ORIG|REPL */
 443                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_PACKETS */
 444                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_BYTES */
 445 #endif
 446                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_TIMEOUT */
 447                 + nla_total_size(0)             /* CTA_PROTOINFO */
 448                 + nla_total_size(0)             /* CTA_HELP */
 449                 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 450 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 451                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_SECMARK */
 452 #endif
 453 #ifdef CONFIG_NF_NAT_NEEDED
 454                 + 2 * nla_total_size(0)         /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 455                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_POS */
 456                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_BEFORE */
 457                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_AFTER */
 458 #endif
 459 #ifdef CONFIG_NF_CONNTRACK_MARK
 460                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_MARK */
 461 #endif
 462                 ;
 463
 464 #undef NLA_TYPE_SIZE
 465
 466         rcu_read_lock();
 467         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 468         len += l3proto->nla_size;
 469
 470         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 471         len += l4proto->nla_size;
 472         rcu_read_unlock();
 473
 474         return alloc_skb(len, gfp);
 475 }
 476
 477 static int ctnetlink_conntrack_event(struct notifier_block *this,
 478                                      unsigned long events, void *ptr)
 479 {
 480         struct nlmsghdr *nlh;
 481         struct nfgenmsg *nfmsg;
 482         struct nlattr *nest_parms;
 483         struct nf_ct_event *item = (struct nf_ct_event *)ptr;
 484         struct nf_conn *ct = item->ct;
 485         struct sk_buff *skb;
 486         unsigned int type;
 487         sk_buff_data_t b;
 488         unsigned int flags = 0, group;
 489
 490         /* ignore our fake conntrack entry */
 491         if (ct == &nf_conntrack_untracked)
 492                 return NOTIFY_DONE;
 493
 494         if (events & IPCT_DESTROY) {
 495                 type = IPCTNL_MSG_CT_DELETE;
 496                 group = NFNLGRP_CONNTRACK_DESTROY;
 497         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 498                 type = IPCTNL_MSG_CT_NEW;
 499                 flags = NLM_F_CREATE|NLM_F_EXCL;
 500                 group = NFNLGRP_CONNTRACK_NEW;
 501         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 502                 type = IPCTNL_MSG_CT_NEW;
 503                 group = NFNLGRP_CONNTRACK_UPDATE;
 504         } else
 505                 return NOTIFY_DONE;
 506
 507         if (!item->report && !nfnetlink_has_listeners(group))
 508                 return NOTIFY_DONE;
 509
 510         skb = ctnetlink_alloc_skb(nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL),
 511                                   GFP_ATOMIC);
 512         if (!skb)
 513                 goto errout;
 514
 515         b = skb->tail;
 516
 517         type |= NFNL_SUBSYS_CTNETLINK << 8;
 518         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
 519         nfmsg = NLMSG_DATA(nlh);
 520
 521         nlh->nlmsg_flags    = flags;
 522         nfmsg->nfgen_family = nf_ct_l3num(ct);
 523         nfmsg->version  = NFNETLINK_V0;
 524         nfmsg->res_id   = 0;
 525
 526         rcu_read_lock();
 527         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 528         if (!nest_parms)
 529                 goto nla_put_failure;
 530         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 531                 goto nla_put_failure;
 532         nla_nest_end(skb, nest_parms);
 533
 534         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 535         if (!nest_parms)
 536                 goto nla_put_failure;
 537         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 538                 goto nla_put_failure;
 539         nla_nest_end(skb, nest_parms);
 540
 541         if (ctnetlink_dump_id(skb, ct) < 0)
 542                 goto nla_put_failure;
 543
 544         if (ctnetlink_dump_status(skb, ct) < 0)
 545                 goto nla_put_failure;
 546
 547         if (events & IPCT_DESTROY) {
 548                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 549                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 550                         goto nla_put_failure;
 551         } else {
 552                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 553                         goto nla_put_failure;
 554
 555                 if (events & IPCT_PROTOINFO
 556                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 557                         goto nla_put_failure;
 558
 559                 if ((events & IPCT_HELPER || nfct_help(ct))
 560                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 561                         goto nla_put_failure;
 562
 563 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 564                 if ((events & IPCT_SECMARK || ct->secmark)
 565                     && ctnetlink_dump_secmark(skb, ct) < 0)
 566                         goto nla_put_failure;
 567 #endif
 568
 569                 if (events & IPCT_RELATED &&
 570                     ctnetlink_dump_master(skb, ct) < 0)
 571                         goto nla_put_failure;
 572
 573                 if (events & IPCT_NATSEQADJ &&
 574                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 575                         goto nla_put_failure;
 576         }
 577
 578 #ifdef CONFIG_NF_CONNTRACK_MARK
 579         if ((events & IPCT_MARK || ct->mark)
 580             && ctnetlink_dump_mark(skb, ct) < 0)
 581                 goto nla_put_failure;
 582 #endif
 583         rcu_read_unlock();
 584
 585         nlh->nlmsg_len = skb->tail - b;
 586         nfnetlink_send(skb, item->pid, group, item->report);
 587         return NOTIFY_DONE;
 588
 589 nla_put_failure:
 590         rcu_read_unlock();
 591 nlmsg_failure:
 592         kfree_skb(skb);
 593 errout:
 594         nfnetlink_set_err(0, group, -ENOBUFS);
 595         return NOTIFY_DONE;
 596 }
 597 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 598
 599 static int ctnetlink_done(struct netlink_callback *cb)
 600 {
 601         if (cb->args[1])
 602                 nf_ct_put((struct nf_conn *)cb->args[1]);
 603         return 0;
 604 }
 605
 606 static int
 607 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 608 {
 609         struct nf_conn *ct, *last;
 610         struct nf_conntrack_tuple_hash *h;
 611         struct hlist_nulls_node *n;
 612         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 613         u_int8_t l3proto = nfmsg->nfgen_family;
 614
 615         rcu_read_lock();
 616         last = (struct nf_conn *)cb->args[1];
 617         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 618 restart:
 619                 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 620                                          hnnode) {
 621                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 622                                 continue;
 623                         ct = nf_ct_tuplehash_to_ctrack(h);
 624                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 625                                 continue;
 626                         /* Dump entries of a given L3 protocol number.
 627                          * If it is not specified, ie. l3proto == 0,
 628                          * then dump everything. */
 629                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 630                                 goto releasect;
 631                         if (cb->args[1]) {
 632                                 if (ct != last)
 633                                         goto releasect;
 634                                 cb->args[1] = 0;
 635                         }
 636                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 637                                                 cb->nlh->nlmsg_seq,
 638                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 639                                 cb->args[1] = (unsigned long)ct;
 640                                 goto out;
 641                         }
 642
 643                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 644                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 645                                 struct nf_conn_counter *acct;
 646
 647                                 acct = nf_conn_acct_find(ct);
 648                                 if (acct)
 649                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 650                         }
 651 releasect:
 652                 nf_ct_put(ct);
 653                 }
 654                 if (cb->args[1]) {
 655                         cb->args[1] = 0;
 656                         goto restart;
 657                 }
 658         }
 659 out:
 660         rcu_read_unlock();
 661         if (last)
 662                 nf_ct_put(last);
 663
 664         return skb->len;
 665 }
 666
 667 static inline int
 668 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 669 {
 670         struct nlattr *tb[CTA_IP_MAX+1];
 671         struct nf_conntrack_l3proto *l3proto;
 672         int ret = 0;
 673
 674         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 675
 676         rcu_read_lock();
 677         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 678
 679         if (likely(l3proto->nlattr_to_tuple)) {
 680                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 681                                           l3proto->nla_policy);
 682                 if (ret == 0)
 683                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 684         }
 685
 686         rcu_read_unlock();
 687
 688         return ret;
 689 }
 690
 691 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 692         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 693 };
 694
 695 static inline int
 696 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 697                             struct nf_conntrack_tuple *tuple)
 698 {
 699         struct nlattr *tb[CTA_PROTO_MAX+1];
 700         struct nf_conntrack_l4proto *l4proto;
 701         int ret = 0;
 702
 703         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 704         if (ret < 0)
 705                 return ret;
 706
 707         if (!tb[CTA_PROTO_NUM])
 708                 return -EINVAL;
 709         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 710
 711         rcu_read_lock();
 712         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 713
 714         if (likely(l4proto->nlattr_to_tuple)) {
 715                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 716                                           l4proto->nla_policy);
 717                 if (ret == 0)
 718                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 719         }
 720
 721         rcu_read_unlock();
 722
 723         return ret;
 724 }
 725
 726 static int
 727 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 728                       enum ctattr_tuple type, u_int8_t l3num)
 729 {
 730         struct nlattr *tb[CTA_TUPLE_MAX+1];
 731         int err;
 732
 733         memset(tuple, 0, sizeof(*tuple));
 734
 735         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 736
 737         if (!tb[CTA_TUPLE_IP])
 738                 return -EINVAL;
 739
 740         tuple->src.l3num = l3num;
 741
 742         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 743         if (err < 0)
 744                 return err;
 745
 746         if (!tb[CTA_TUPLE_PROTO])
 747                 return -EINVAL;
 748
 749         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 750         if (err < 0)
 751                 return err;
 752
 753         /* orig and expect tuples get DIR_ORIGINAL */
 754         if (type == CTA_TUPLE_REPLY)
 755                 tuple->dst.dir = IP_CT_DIR_REPLY;
 756         else
 757                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 758
 759         return 0;
 760 }
 761
 762 static inline int
 763 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 764 {
 765         struct nlattr *tb[CTA_HELP_MAX+1];
 766
 767         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 768
 769         if (!tb[CTA_HELP_NAME])
 770                 return -EINVAL;
 771
 772         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 773
 774         return 0;
 775 }
 776
 777 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 778         [CTA_STATUS]            = { .type = NLA_U32 },
 779         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 780         [CTA_MARK]              = { .type = NLA_U32 },
 781         [CTA_USE]               = { .type = NLA_U32 },
 782         [CTA_ID]                = { .type = NLA_U32 },
 783 };
 784
 785 static int
 786 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 787                         struct nlmsghdr *nlh, struct nlattr *cda[])
 788 {
 789         struct nf_conntrack_tuple_hash *h;
 790         struct nf_conntrack_tuple tuple;
 791         struct nf_conn *ct;
 792         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 793         u_int8_t u3 = nfmsg->nfgen_family;
 794         int err = 0;
 795
 796         if (cda[CTA_TUPLE_ORIG])
 797                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 798         else if (cda[CTA_TUPLE_REPLY])
 799                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 800         else {
 801                 /* Flush the whole table */
 802                 nf_conntrack_flush(&init_net,
 803                                    NETLINK_CB(skb).pid,
 804                                    nlmsg_report(nlh));
 805                 return 0;
 806         }
 807
 808         if (err < 0)
 809                 return err;
 810
 811         h = nf_conntrack_find_get(&init_net, &tuple);
 812         if (!h)
 813                 return -ENOENT;
 814
 815         ct = nf_ct_tuplehash_to_ctrack(h);
 816
 817         if (cda[CTA_ID]) {
 818                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 819                 if (id != (u32)(unsigned long)ct) {
 820                         nf_ct_put(ct);
 821                         return -ENOENT;
 822                 }
 823         }
 824
 825         nf_conntrack_event_report(IPCT_DESTROY,
 826                                   ct,
 827                                   NETLINK_CB(skb).pid,
 828                                   nlmsg_report(nlh));
 829
 830         /* death_by_timeout would report the event again */
 831         set_bit(IPS_DYING_BIT, &ct->status);
 832
 833         nf_ct_kill(ct);
 834         nf_ct_put(ct);
 835
 836         return 0;
 837 }
 838
 839 static int
 840 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 841                         struct nlmsghdr *nlh, struct nlattr *cda[])
 842 {
 843         struct nf_conntrack_tuple_hash *h;
 844         struct nf_conntrack_tuple tuple;
 845         struct nf_conn *ct;
 846         struct sk_buff *skb2 = NULL;
 847         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 848         u_int8_t u3 = nfmsg->nfgen_family;
 849         int err = 0;
 850
 851         if (nlh->nlmsg_flags & NLM_F_DUMP)
 852                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 853                                           ctnetlink_done);
 854
 855         if (cda[CTA_TUPLE_ORIG])
 856                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 857         else if (cda[CTA_TUPLE_REPLY])
 858                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 859         else
 860                 return -EINVAL;
 861
 862         if (err < 0)
 863                 return err;
 864
 865         h = nf_conntrack_find_get(&init_net, &tuple);
 866         if (!h)
 867                 return -ENOENT;
 868
 869         ct = nf_ct_tuplehash_to_ctrack(h);
 870
 871         err = -ENOMEM;
 872         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 873         if (!skb2) {
 874                 nf_ct_put(ct);
 875                 return -ENOMEM;
 876         }
 877
 878         rcu_read_lock();
 879         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 880                                   IPCTNL_MSG_CT_NEW, ct);
 881         rcu_read_unlock();
 882         nf_ct_put(ct);
 883         if (err <= 0)
 884                 goto free;
 885
 886         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 887         if (err < 0)
 888                 goto out;
 889
 890         return 0;
 891
 892 free:
 893         kfree_skb(skb2);
 894 out:
 895         return err;
 896 }
 897
 898 #ifdef CONFIG_NF_NAT_NEEDED
 899 static int
 900 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 901                           enum nf_nat_manip_type manip,
 902                           struct nlattr *attr)
 903 {
 904         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 905
 906         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 907         if (!parse_nat_setup) {
 908 #ifdef CONFIG_MODULES
 909                 rcu_read_unlock();
 910                 spin_unlock_bh(&nf_conntrack_lock);
 911                 nfnl_unlock();
 912                 if (request_module("nf-nat-ipv4") < 0) {
 913                         nfnl_lock();
 914                         spin_lock_bh(&nf_conntrack_lock);
 915                         rcu_read_lock();
 916                         return -EOPNOTSUPP;
 917                 }
 918                 nfnl_lock();
 919                 spin_lock_bh(&nf_conntrack_lock);
 920                 rcu_read_lock();
 921                 if (nfnetlink_parse_nat_setup_hook)
 922                         return -EAGAIN;
 923 #endif
 924                 return -EOPNOTSUPP;
 925         }
 926
 927         return parse_nat_setup(ct, manip, attr);
 928 }
 929 #endif
 930
 931 static int
 932 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 933 {
 934         unsigned long d;
 935         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 936         d = ct->status ^ status;
 937
 938         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 939                 /* unchangeable */
 940                 return -EBUSY;
 941
 942         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 943                 /* SEEN_REPLY bit can only be set */
 944                 return -EBUSY;
 945
 946         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 947                 /* ASSURED bit can only be set */
 948                 return -EBUSY;
 949
 950         /* Be careful here, modifying NAT bits can screw up things,
 951          * so don't let users modify them directly if they don't pass
 952          * nf_nat_range. */
 953         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 954         return 0;
 955 }
 956
 957 static int
 958 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 959 {
 960 #ifdef CONFIG_NF_NAT_NEEDED
 961         int ret;
 962
 963         if (cda[CTA_NAT_DST]) {
 964                 ret = ctnetlink_parse_nat_setup(ct,
 965                                                 IP_NAT_MANIP_DST,
 966                                                 cda[CTA_NAT_DST]);
 967                 if (ret < 0)
 968                         return ret;
 969         }
 970         if (cda[CTA_NAT_SRC]) {
 971                 ret = ctnetlink_parse_nat_setup(ct,
 972                                                 IP_NAT_MANIP_SRC,
 973                                                 cda[CTA_NAT_SRC]);
 974                 if (ret < 0)
 975                         return ret;
 976         }
 977         return 0;
 978 #else
 979         return -EOPNOTSUPP;
 980 #endif
 981 }
 982
 983 static inline int
 984 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 985 {
 986         struct nf_conntrack_helper *helper;
 987         struct nf_conn_help *help = nfct_help(ct);
 988         char *helpname = NULL;
 989         int err;
 990
 991         /* don't change helper of sibling connections */
 992         if (ct->master)
 993                 return -EBUSY;
 994
 995         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 996         if (err < 0)
 997                 return err;
 998
 999         if (!strcmp(helpname, "")) {
1000                 if (help && help->helper) {
1001                         /* we had a helper before ... */
1002                         nf_ct_remove_expectations(ct);
1003                         rcu_assign_pointer(help->helper, NULL);
1004                 }
1005
1006                 return 0;
1007         }
1008
1009         helper = __nf_conntrack_helper_find_byname(helpname);
1010         if (helper == NULL) {
1011 #ifdef CONFIG_MODULES
1012                 spin_unlock_bh(&nf_conntrack_lock);
1013
1014                 if (request_module("nfct-helper-%s", helpname) < 0) {
1015                         spin_lock_bh(&nf_conntrack_lock);
1016                         return -EOPNOTSUPP;
1017                 }
1018
1019                 spin_lock_bh(&nf_conntrack_lock);
1020                 helper = __nf_conntrack_helper_find_byname(helpname);
1021                 if (helper)
1022                         return -EAGAIN;
1023 #endif
1024                 return -EOPNOTSUPP;
1025         }
1026
1027         if (help) {
1028                 if (help->helper == helper)
1029                         return 0;
1030                 if (help->helper)
1031                         return -EBUSY;
1032                 /* need to zero data of old helper */
1033                 memset(&help->help, 0, sizeof(help->help));
1034         } else {
1035                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1036                 if (help == NULL)
1037                         return -ENOMEM;
1038         }
1039
1040         rcu_assign_pointer(help->helper, helper);
1041
1042         return 0;
1043 }
1044
1045 static inline int
1046 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1047 {
1048         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1049
1050         if (!del_timer(&ct->timeout))
1051                 return -ETIME;
1052
1053         ct->timeout.expires = jiffies + timeout * HZ;
1054         add_timer(&ct->timeout);
1055
1056         return 0;
1057 }
1058
1059 static inline int
1060 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1061 {
1062         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1063         struct nf_conntrack_l4proto *l4proto;
1064         int err = 0;
1065
1066         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1067
1068         rcu_read_lock();
1069         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1070         if (l4proto->from_nlattr)
1071                 err = l4proto->from_nlattr(tb, ct);
1072         rcu_read_unlock();
1073
1074         return err;
1075 }
1076
1077 #ifdef CONFIG_NF_NAT_NEEDED
1078 static inline int
1079 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1080 {
1081         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1082
1083         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1084
1085         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1086                 return -EINVAL;
1087
1088         natseq->correction_pos =
1089                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1090
1091         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1092                 return -EINVAL;
1093
1094         natseq->offset_before =
1095                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1096
1097         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1098                 return -EINVAL;
1099
1100         natseq->offset_after =
1101                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1102
1103         return 0;
1104 }
1105
1106 static int
1107 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1108 {
1109         int ret = 0;
1110         struct nf_conn_nat *nat = nfct_nat(ct);
1111
1112         if (!nat)
1113                 return 0;
1114
1115         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1116                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1117                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1118                 if (ret < 0)
1119                         return ret;
1120
1121                 ct->status |= IPS_SEQ_ADJUST;
1122         }
1123
1124         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1125                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1126                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1127                 if (ret < 0)
1128                         return ret;
1129
1130                 ct->status |= IPS_SEQ_ADJUST;
1131         }
1132
1133         return 0;
1134 }
1135 #endif
1136
1137 static int
1138 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1139 {
1140         int err;
1141
1142         /* only allow NAT changes and master assignation for new conntracks */
1143         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1144                 return -EOPNOTSUPP;
1145
1146         if (cda[CTA_HELP]) {
1147                 err = ctnetlink_change_helper(ct, cda);
1148                 if (err < 0)
1149                         return err;
1150         }
1151
1152         if (cda[CTA_TIMEOUT]) {
1153                 err = ctnetlink_change_timeout(ct, cda);
1154                 if (err < 0)
1155                         return err;
1156         }
1157
1158         if (cda[CTA_STATUS]) {
1159                 err = ctnetlink_change_status(ct, cda);
1160                 if (err < 0)
1161                         return err;
1162         }
1163
1164         if (cda[CTA_PROTOINFO]) {
1165                 err = ctnetlink_change_protoinfo(ct, cda);
1166                 if (err < 0)
1167                         return err;
1168         }
1169
1170 #if defined(CONFIG_NF_CONNTRACK_MARK)
1171         if (cda[CTA_MARK])
1172                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1173 #endif
1174
1175 #ifdef CONFIG_NF_NAT_NEEDED
1176         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1177                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1178                 if (err < 0)
1179                         return err;
1180         }
1181 #endif
1182
1183         return 0;
1184 }
1185
1186 static struct nf_conn *
1187 ctnetlink_create_conntrack(struct nlattr *cda[],
1188                            struct nf_conntrack_tuple *otuple,
1189                            struct nf_conntrack_tuple *rtuple,
1190                            u8 u3)
1191 {
1192         struct nf_conn *ct;
1193         int err = -EINVAL;
1194         struct nf_conntrack_helper *helper;
1195
1196         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1197         if (IS_ERR(ct))
1198                 return ERR_PTR(-ENOMEM);
1199
1200         if (!cda[CTA_TIMEOUT])
1201                 goto err1;
1202         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1203
1204         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1205         ct->status |= IPS_CONFIRMED;
1206
1207         rcu_read_lock();
1208         if (cda[CTA_HELP]) {
1209                 char *helpname = NULL;
1210
1211                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1212                 if (err < 0)
1213                         goto err2;
1214
1215                 helper = __nf_conntrack_helper_find_byname(helpname);
1216                 if (helper == NULL) {
1217                         rcu_read_unlock();
1218 #ifdef CONFIG_MODULES
1219                         if (request_module("nfct-helper-%s", helpname) < 0) {
1220                                 err = -EOPNOTSUPP;
1221                                 goto err1;
1222                         }
1223
1224                         rcu_read_lock();
1225                         helper = __nf_conntrack_helper_find_byname(helpname);
1226                         if (helper) {
1227                                 err = -EAGAIN;
1228                                 goto err2;
1229                         }
1230                         rcu_read_unlock();
1231 #endif
1232                         err = -EOPNOTSUPP;
1233                         goto err1;
1234                 } else {
1235                         struct nf_conn_help *help;
1236
1237                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1238                         if (help == NULL) {
1239                                 err = -ENOMEM;
1240                                 goto err2;
1241                         }
1242
1243                         /* not in hash table yet so not strictly necessary */
1244                         rcu_assign_pointer(help->helper, helper);
1245                 }
1246         } else {
1247                 /* try an implicit helper assignation */
1248                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1249                 if (err < 0)
1250                         goto err2;
1251         }
1252
1253         if (cda[CTA_STATUS]) {
1254                 err = ctnetlink_change_status(ct, cda);
1255                 if (err < 0)
1256                         goto err2;
1257         }
1258
1259         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1260                 err = ctnetlink_change_nat(ct, cda);
1261                 if (err < 0)
1262                         goto err2;
1263         }
1264
1265 #ifdef CONFIG_NF_NAT_NEEDED
1266         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1267                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1268                 if (err < 0)
1269                         goto err2;
1270         }
1271 #endif
1272
1273         if (cda[CTA_PROTOINFO]) {
1274                 err = ctnetlink_change_protoinfo(ct, cda);
1275                 if (err < 0)
1276                         goto err2;
1277         }
1278
1279         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1280
1281 #if defined(CONFIG_NF_CONNTRACK_MARK)
1282         if (cda[CTA_MARK])
1283                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1284 #endif
1285
1286         /* setup master conntrack: this is a confirmed expectation */
1287         if (cda[CTA_TUPLE_MASTER]) {
1288                 struct nf_conntrack_tuple master;
1289                 struct nf_conntrack_tuple_hash *master_h;
1290                 struct nf_conn *master_ct;
1291
1292                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1293                 if (err < 0)
1294                         goto err2;
1295
1296                 master_h = nf_conntrack_find_get(&init_net, &master);
1297                 if (master_h == NULL) {
1298                         err = -ENOENT;
1299                         goto err2;
1300                 }
1301                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1302                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1303                 ct->master = master_ct;
1304         }
1305
1306         add_timer(&ct->timeout);
1307         nf_conntrack_hash_insert(ct);
1308         rcu_read_unlock();
1309
1310         return ct;
1311
1312 err2:
1313         rcu_read_unlock();
1314 err1:
1315         nf_conntrack_free(ct);
1316         return ERR_PTR(err);
1317 }
1318
1319 static int
1320 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1321                         struct nlmsghdr *nlh, struct nlattr *cda[])
1322 {
1323         struct nf_conntrack_tuple otuple, rtuple;
1324         struct nf_conntrack_tuple_hash *h = NULL;
1325         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1326         u_int8_t u3 = nfmsg->nfgen_family;
1327         int err = 0;
1328
1329         if (cda[CTA_TUPLE_ORIG]) {
1330                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1331                 if (err < 0)
1332                         return err;
1333         }
1334
1335         if (cda[CTA_TUPLE_REPLY]) {
1336                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1337                 if (err < 0)
1338                         return err;
1339         }
1340
1341         spin_lock_bh(&nf_conntrack_lock);
1342         if (cda[CTA_TUPLE_ORIG])
1343                 h = __nf_conntrack_find(&init_net, &otuple);
1344         else if (cda[CTA_TUPLE_REPLY])
1345                 h = __nf_conntrack_find(&init_net, &rtuple);
1346
1347         if (h == NULL) {
1348                 err = -ENOENT;
1349                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1350                         struct nf_conn *ct;
1351                         enum ip_conntrack_events events;
1352
1353                         ct = ctnetlink_create_conntrack(cda, &otuple,
1354                                                         &rtuple, u3);
1355                         if (IS_ERR(ct)) {
1356                                 err = PTR_ERR(ct);
1357                                 goto out_unlock;
1358                         }
1359                         err = 0;
1360                         nf_conntrack_get(&ct->ct_general);
1361                         spin_unlock_bh(&nf_conntrack_lock);
1362                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1363                                 events = IPCT_RELATED;
1364                         else
1365                                 events = IPCT_NEW;
1366
1367                         nf_conntrack_event_report(IPCT_STATUS |
1368                                                   IPCT_HELPER |
1369                                                   IPCT_PROTOINFO |
1370                                                   IPCT_NATSEQADJ |
1371                                                   IPCT_MARK | events,
1372                                                   ct, NETLINK_CB(skb).pid,
1373                                                   nlmsg_report(nlh));
1374                         nf_ct_put(ct);
1375                 } else
1376                         spin_unlock_bh(&nf_conntrack_lock);
1377
1378                 return err;
1379         }
1380         /* implicit 'else' */
1381
1382         /* We manipulate the conntrack inside the global conntrack table lock,
1383          * so there's no need to increase the refcount */
1384         err = -EEXIST;
1385         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1386                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1387
1388                 err = ctnetlink_change_conntrack(ct, cda);
1389                 if (err == 0) {
1390                         nf_conntrack_get(&ct->ct_general);
1391                         spin_unlock_bh(&nf_conntrack_lock);
1392                         nf_conntrack_event_report(IPCT_STATUS |
1393                                                   IPCT_HELPER |
1394                                                   IPCT_PROTOINFO |
1395                                                   IPCT_NATSEQADJ |
1396                                                   IPCT_MARK,
1397                                                   ct, NETLINK_CB(skb).pid,
1398                                                   nlmsg_report(nlh));
1399                         nf_ct_put(ct);
1400                 } else
1401                         spin_unlock_bh(&nf_conntrack_lock);
1402
1403                 return err;
1404         }
1405
1406 out_unlock:
1407         spin_unlock_bh(&nf_conntrack_lock);
1408         return err;
1409 }
1410
1411 /***********************************************************************
1412  * EXPECT
1413  ***********************************************************************/
1414
1415 static inline int
1416 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1417                          const struct nf_conntrack_tuple *tuple,
1418                          enum ctattr_expect type)
1419 {
1420         struct nlattr *nest_parms;
1421
1422         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1423         if (!nest_parms)
1424                 goto nla_put_failure;
1425         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1426                 goto nla_put_failure;
1427         nla_nest_end(skb, nest_parms);
1428
1429         return 0;
1430
1431 nla_put_failure:
1432         return -1;
1433 }
1434
1435 static inline int
1436 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1437                         const struct nf_conntrack_tuple *tuple,
1438                         const struct nf_conntrack_tuple_mask *mask)
1439 {
1440         int ret;
1441         struct nf_conntrack_l3proto *l3proto;
1442         struct nf_conntrack_l4proto *l4proto;
1443         struct nf_conntrack_tuple m;
1444         struct nlattr *nest_parms;
1445
1446         memset(&m, 0xFF, sizeof(m));
1447         m.src.u.all = mask->src.u.all;
1448         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1449
1450         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1451         if (!nest_parms)
1452                 goto nla_put_failure;
1453
1454         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1455         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1456
1457         if (unlikely(ret < 0))
1458                 goto nla_put_failure;
1459
1460         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1461         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1462         if (unlikely(ret < 0))
1463                 goto nla_put_failure;
1464
1465         nla_nest_end(skb, nest_parms);
1466
1467         return 0;
1468
1469 nla_put_failure:
1470         return -1;
1471 }
1472
1473 static int
1474 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1475                           const struct nf_conntrack_expect *exp)
1476 {
1477         struct nf_conn *master = exp->master;
1478         long timeout = (exp->timeout.expires - jiffies) / HZ;
1479
1480         if (timeout < 0)
1481                 timeout = 0;
1482
1483         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1484                 goto nla_put_failure;
1485         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1486                 goto nla_put_failure;
1487         if (ctnetlink_exp_dump_tuple(skb,
1488                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1489                                  CTA_EXPECT_MASTER) < 0)
1490                 goto nla_put_failure;
1491
1492         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1493         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1494
1495         return 0;
1496
1497 nla_put_failure:
1498         return -1;
1499 }
1500
1501 static int
1502 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1503                         int event, const struct nf_conntrack_expect *exp)
1504 {
1505         struct nlmsghdr *nlh;
1506         struct nfgenmsg *nfmsg;
1507         unsigned char *b = skb_tail_pointer(skb);
1508
1509         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1510         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1511         nfmsg  = NLMSG_DATA(nlh);
1512
1513         nlh->nlmsg_flags    = pid ? NLM_F_MULTI : 0;
1514         nfmsg->nfgen_family = exp->tuple.src.l3num;
1515         nfmsg->version      = NFNETLINK_V0;
1516         nfmsg->res_id       = 0;
1517
1518         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1519                 goto nla_put_failure;
1520
1521         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1522         return skb->len;
1523
1524 nlmsg_failure:
1525 nla_put_failure:
1526         nlmsg_trim(skb, b);
1527         return -1;
1528 }
1529
1530 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1531 static int ctnetlink_expect_event(struct notifier_block *this,
1532                                   unsigned long events, void *ptr)
1533 {
1534         struct nlmsghdr *nlh;
1535         struct nfgenmsg *nfmsg;
1536         struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1537         struct nf_conntrack_expect *exp = item->exp;
1538         struct sk_buff *skb;
1539         unsigned int type;
1540         sk_buff_data_t b;
1541         int flags = 0;
1542
1543         if (events & IPEXP_NEW) {
1544                 type = IPCTNL_MSG_EXP_NEW;
1545                 flags = NLM_F_CREATE|NLM_F_EXCL;
1546         } else
1547                 return NOTIFY_DONE;
1548
1549         if (!item->report &&
1550             !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1551                 return NOTIFY_DONE;
1552
1553         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1554         if (!skb)
1555                 goto errout;
1556
1557         b = skb->tail;
1558
1559         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1560         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1561         nfmsg = NLMSG_DATA(nlh);
1562
1563         nlh->nlmsg_flags    = flags;
1564         nfmsg->nfgen_family = exp->tuple.src.l3num;
1565         nfmsg->version      = NFNETLINK_V0;
1566         nfmsg->res_id       = 0;
1567
1568         rcu_read_lock();
1569         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1570                 goto nla_put_failure;
1571         rcu_read_unlock();
1572
1573         nlh->nlmsg_len = skb->tail - b;
1574         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1575         return NOTIFY_DONE;
1576
1577 nla_put_failure:
1578         rcu_read_unlock();
1579 nlmsg_failure:
1580         kfree_skb(skb);
1581 errout:
1582         nfnetlink_set_err(0, 0, -ENOBUFS);
1583         return NOTIFY_DONE;
1584 }
1585 #endif
1586 static int ctnetlink_exp_done(struct netlink_callback *cb)
1587 {
1588         if (cb->args[1])
1589                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1590         return 0;
1591 }
1592
1593 static int
1594 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1595 {
1596         struct net *net = &init_net;
1597         struct nf_conntrack_expect *exp, *last;
1598         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1599         struct hlist_node *n;
1600         u_int8_t l3proto = nfmsg->nfgen_family;
1601
1602         rcu_read_lock();
1603         last = (struct nf_conntrack_expect *)cb->args[1];
1604         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1605 restart:
1606                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1607                                      hnode) {
1608                         if (l3proto && exp->tuple.src.l3num != l3proto)
1609                                 continue;
1610                         if (cb->args[1]) {
1611                                 if (exp != last)
1612                                         continue;
1613                                 cb->args[1] = 0;
1614                         }
1615                         if (ctnetlink_exp_fill_info(skb,
1616                                                     NETLINK_CB(cb->skb).pid,
1617                                                     cb->nlh->nlmsg_seq,
1618                                                     IPCTNL_MSG_EXP_NEW,
1619                                                     exp) < 0) {
1620                                 if (!atomic_inc_not_zero(&exp->use))
1621                                         continue;
1622                                 cb->args[1] = (unsigned long)exp;
1623                                 goto out;
1624                         }
1625                 }
1626                 if (cb->args[1]) {
1627                         cb->args[1] = 0;
1628                         goto restart;
1629                 }
1630         }
1631 out:
1632         rcu_read_unlock();
1633         if (last)
1634                 nf_ct_expect_put(last);
1635
1636         return skb->len;
1637 }
1638
1639 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1640         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1641         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1642 };
1643
1644 static int
1645 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1646                      struct nlmsghdr *nlh, struct nlattr *cda[])
1647 {
1648         struct nf_conntrack_tuple tuple;
1649         struct nf_conntrack_expect *exp;
1650         struct sk_buff *skb2;
1651         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1652         u_int8_t u3 = nfmsg->nfgen_family;
1653         int err = 0;
1654
1655         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1656                 return netlink_dump_start(ctnl, skb, nlh,
1657                                           ctnetlink_exp_dump_table,
1658                                           ctnetlink_exp_done);
1659         }
1660
1661         if (cda[CTA_EXPECT_MASTER])
1662                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1663         else
1664                 return -EINVAL;
1665
1666         if (err < 0)
1667                 return err;
1668
1669         exp = nf_ct_expect_find_get(&init_net, &tuple);
1670         if (!exp)
1671                 return -ENOENT;
1672
1673         if (cda[CTA_EXPECT_ID]) {
1674                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1675                 if (ntohl(id) != (u32)(unsigned long)exp) {
1676                         nf_ct_expect_put(exp);
1677                         return -ENOENT;
1678                 }
1679         }
1680
1681         err = -ENOMEM;
1682         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1683         if (!skb2)
1684                 goto out;
1685
1686         rcu_read_lock();
1687         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1688                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1689         rcu_read_unlock();
1690         if (err <= 0)
1691                 goto free;
1692
1693         nf_ct_expect_put(exp);
1694
1695         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1696
1697 free:
1698         kfree_skb(skb2);
1699 out:
1700         nf_ct_expect_put(exp);
1701         return err;
1702 }
1703
1704 static int
1705 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1706                      struct nlmsghdr *nlh, struct nlattr *cda[])
1707 {
1708         struct nf_conntrack_expect *exp;
1709         struct nf_conntrack_tuple tuple;
1710         struct nf_conntrack_helper *h;
1711         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1712         struct hlist_node *n, *next;
1713         u_int8_t u3 = nfmsg->nfgen_family;
1714         unsigned int i;
1715         int err;
1716
1717         if (cda[CTA_EXPECT_TUPLE]) {
1718                 /* delete a single expect by tuple */
1719                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1720                 if (err < 0)
1721                         return err;
1722
1723                 /* bump usage count to 2 */
1724                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1725                 if (!exp)
1726                         return -ENOENT;
1727
1728                 if (cda[CTA_EXPECT_ID]) {
1729                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1730                         if (ntohl(id) != (u32)(unsigned long)exp) {
1731                                 nf_ct_expect_put(exp);
1732                                 return -ENOENT;
1733                         }
1734                 }
1735
1736                 /* after list removal, usage count == 1 */
1737                 nf_ct_unexpect_related(exp);
1738                 /* have to put what we 'get' above.
1739                  * after this line usage count == 0 */
1740                 nf_ct_expect_put(exp);
1741         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1742                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1743                 struct nf_conn_help *m_help;
1744
1745                 /* delete all expectations for this helper */
1746                 spin_lock_bh(&nf_conntrack_lock);
1747                 h = __nf_conntrack_helper_find_byname(name);
1748                 if (!h) {
1749                         spin_unlock_bh(&nf_conntrack_lock);
1750                         return -EOPNOTSUPP;
1751                 }
1752                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1753                         hlist_for_each_entry_safe(exp, n, next,
1754                                                   &init_net.ct.expect_hash[i],
1755                                                   hnode) {
1756                                 m_help = nfct_help(exp->master);
1757                                 if (m_help->helper == h
1758                                     && del_timer(&exp->timeout)) {
1759                                         nf_ct_unlink_expect(exp);
1760                                         nf_ct_expect_put(exp);
1761                                 }
1762                         }
1763                 }
1764                 spin_unlock_bh(&nf_conntrack_lock);
1765         } else {
1766                 /* This basically means we have to flush everything*/
1767                 spin_lock_bh(&nf_conntrack_lock);
1768                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1769                         hlist_for_each_entry_safe(exp, n, next,
1770                                                   &init_net.ct.expect_hash[i],
1771                                                   hnode) {
1772                                 if (del_timer(&exp->timeout)) {
1773                                         nf_ct_unlink_expect(exp);
1774                                         nf_ct_expect_put(exp);
1775                                 }
1776                         }
1777                 }
1778                 spin_unlock_bh(&nf_conntrack_lock);
1779         }
1780
1781         return 0;
1782 }
1783 static int
1784 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1785 {
1786         return -EOPNOTSUPP;
1787 }
1788
1789 static int
1790 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1791 {
1792         struct nf_conntrack_tuple tuple, mask, master_tuple;
1793         struct nf_conntrack_tuple_hash *h = NULL;
1794         struct nf_conntrack_expect *exp;
1795         struct nf_conn *ct;
1796         struct nf_conn_help *help;
1797         int err = 0;
1798
1799         /* caller guarantees that those three CTA_EXPECT_* exist */
1800         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1801         if (err < 0)
1802                 return err;
1803         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1804         if (err < 0)
1805                 return err;
1806         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1807         if (err < 0)
1808                 return err;
1809
1810         /* Look for master conntrack of this expectation */
1811         h = nf_conntrack_find_get(&init_net, &master_tuple);
1812         if (!h)
1813                 return -ENOENT;
1814         ct = nf_ct_tuplehash_to_ctrack(h);
1815         help = nfct_help(ct);
1816
1817         if (!help || !help->helper) {
1818                 /* such conntrack hasn't got any helper, abort */
1819                 err = -EOPNOTSUPP;
1820                 goto out;
1821         }
1822
1823         exp = nf_ct_expect_alloc(ct);
1824         if (!exp) {
1825                 err = -ENOMEM;
1826                 goto out;
1827         }
1828
1829         exp->class = 0;
1830         exp->expectfn = NULL;
1831         exp->flags = 0;
1832         exp->master = ct;
1833         exp->helper = NULL;
1834         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1835         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1836         exp->mask.src.u.all = mask.src.u.all;
1837
1838         err = nf_ct_expect_related_report(exp, pid, report);
1839         nf_ct_expect_put(exp);
1840
1841 out:
1842         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1843         return err;
1844 }
1845
1846 static int
1847 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1848                      struct nlmsghdr *nlh, struct nlattr *cda[])
1849 {
1850         struct nf_conntrack_tuple tuple;
1851         struct nf_conntrack_expect *exp;
1852         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1853         u_int8_t u3 = nfmsg->nfgen_family;
1854         int err = 0;
1855
1856         if (!cda[CTA_EXPECT_TUPLE]
1857             || !cda[CTA_EXPECT_MASK]
1858             || !cda[CTA_EXPECT_MASTER])
1859                 return -EINVAL;
1860
1861         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1862         if (err < 0)
1863                 return err;
1864
1865         spin_lock_bh(&nf_conntrack_lock);
1866         exp = __nf_ct_expect_find(&init_net, &tuple);
1867
1868         if (!exp) {
1869                 spin_unlock_bh(&nf_conntrack_lock);
1870                 err = -ENOENT;
1871                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1872                         err = ctnetlink_create_expect(cda,
1873                                                       u3,
1874                                                       NETLINK_CB(skb).pid,
1875                                                       nlmsg_report(nlh));
1876                 }
1877                 return err;
1878         }
1879
1880         err = -EEXIST;
1881         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1882                 err = ctnetlink_change_expect(exp, cda);
1883         spin_unlock_bh(&nf_conntrack_lock);
1884
1885         return err;
1886 }
1887
1888 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1889 static struct notifier_block ctnl_notifier = {
1890         .notifier_call  = ctnetlink_conntrack_event,
1891 };
1892
1893 static struct notifier_block ctnl_notifier_exp = {
1894         .notifier_call  = ctnetlink_expect_event,
1895 };
1896 #endif
1897
1898 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1899         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1900                                             .attr_count = CTA_MAX,
1901                                             .policy = ct_nla_policy },
1902         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1903                                             .attr_count = CTA_MAX,
1904                                             .policy = ct_nla_policy },
1905         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1906                                             .attr_count = CTA_MAX,
1907                                             .policy = ct_nla_policy },
1908         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1909                                             .attr_count = CTA_MAX,
1910                                             .policy = ct_nla_policy },
1911 };
1912
1913 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1914         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1915                                             .attr_count = CTA_EXPECT_MAX,
1916                                             .policy = exp_nla_policy },
1917         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1918                                             .attr_count = CTA_EXPECT_MAX,
1919                                             .policy = exp_nla_policy },
1920         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1921                                             .attr_count = CTA_EXPECT_MAX,
1922                                             .policy = exp_nla_policy },
1923 };
1924
1925 static const struct nfnetlink_subsystem ctnl_subsys = {
1926         .name                           = "conntrack",
1927         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1928         .cb_count                       = IPCTNL_MSG_MAX,
1929         .cb                             = ctnl_cb,
1930 };
1931
1932 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1933         .name                           = "conntrack_expect",
1934         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1935         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1936         .cb                             = ctnl_exp_cb,
1937 };
1938
1939 MODULE_ALIAS("ip_conntrack_netlink");
1940 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1941 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1942
1943 static int __init ctnetlink_init(void)
1944 {
1945         int ret;
1946
1947         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1948         ret = nfnetlink_subsys_register(&ctnl_subsys);
1949         if (ret < 0) {
1950                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1951                 goto err_out;
1952         }
1953
1954         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1955         if (ret < 0) {
1956                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1957                 goto err_unreg_subsys;
1958         }
1959
1960 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1961         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1962         if (ret < 0) {
1963                 printk("ctnetlink_init: cannot register notifier.\n");
1964                 goto err_unreg_exp_subsys;
1965         }
1966
1967         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1968         if (ret < 0) {
1969                 printk("ctnetlink_init: cannot expect register notifier.\n");
1970                 goto err_unreg_notifier;
1971         }
1972 #endif
1973
1974         return 0;
1975
1976 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1977 err_unreg_notifier:
1978         nf_conntrack_unregister_notifier(&ctnl_notifier);
1979 err_unreg_exp_subsys:
1980         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1981 #endif
1982 err_unreg_subsys:
1983         nfnetlink_subsys_unregister(&ctnl_subsys);
1984 err_out:
1985         return ret;
1986 }
1987
1988 static void __exit ctnetlink_exit(void)
1989 {
1990         printk("ctnetlink: unregistering from nfnetlink.\n");
1991
1992 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1993         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1994         nf_conntrack_unregister_notifier(&ctnl_notifier);
1995 #endif
1996
1997         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1998         nfnetlink_subsys_unregister(&ctnl_subsys);
1999         return;
2000 }
2001
2002 module_init(ctnetlink_init);
2003 module_exit(ctnetlink_exit);