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 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 350
 351 static int
 352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 353                     int event, int nowait,
 354                     const struct nf_conn *ct)
 355 {
 356         struct nlmsghdr *nlh;
 357         struct nfgenmsg *nfmsg;
 358         struct nlattr *nest_parms;
 359         unsigned char *b = skb_tail_pointer(skb);
 360
 361         event |= NFNL_SUBSYS_CTNETLINK << 8;
 362         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 363         nfmsg  = NLMSG_DATA(nlh);
 364
 365         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 366         nfmsg->nfgen_family = nf_ct_l3num(ct);
 367         nfmsg->version      = NFNETLINK_V0;
 368         nfmsg->res_id       = 0;
 369
 370         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 371         if (!nest_parms)
 372                 goto nla_put_failure;
 373         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 374                 goto nla_put_failure;
 375         nla_nest_end(skb, nest_parms);
 376
 377         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 378         if (!nest_parms)
 379                 goto nla_put_failure;
 380         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 381                 goto nla_put_failure;
 382         nla_nest_end(skb, nest_parms);
 383
 384         if (ctnetlink_dump_status(skb, ct) < 0 ||
 385             ctnetlink_dump_timeout(skb, ct) < 0 ||
 386             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 387             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 388             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 389             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 390             ctnetlink_dump_mark(skb, ct) < 0 ||
 391             ctnetlink_dump_secmark(skb, ct) < 0 ||
 392             ctnetlink_dump_id(skb, ct) < 0 ||
 393             ctnetlink_dump_use(skb, ct) < 0 ||
 394             ctnetlink_dump_master(skb, ct) < 0 ||
 395             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 396                 goto nla_put_failure;
 397
 398         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 399         return skb->len;
 400
 401 nlmsg_failure:
 402 nla_put_failure:
 403         nlmsg_trim(skb, b);
 404         return -1;
 405 }
 406
 407 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 408 /*
 409  * The general structure of a ctnetlink event is
 410  *
 411  *  CTA_TUPLE_ORIG
 412  *    <l3/l4-proto-attributes>
 413  *  CTA_TUPLE_REPLY
 414  *    <l3/l4-proto-attributes>
 415  *  CTA_ID
 416  *  ...
 417  *  CTA_PROTOINFO
 418  *    <l4-proto-attributes>
 419  *  CTA_TUPLE_MASTER
 420  *    <l3/l4-proto-attributes>
 421  *
 422  * Therefore the formular is
 423  *
 424  *   size = sizeof(headers) + sizeof(generic_nlas) + 3 * sizeof(tuple_nlas)
 425  *              + sizeof(protoinfo_nlas)
 426  */
 427 static struct sk_buff *
 428 ctnetlink_alloc_skb(const struct nf_conntrack_tuple *tuple, gfp_t gfp)
 429 {
 430         struct nf_conntrack_l3proto *l3proto;
 431         struct nf_conntrack_l4proto *l4proto;
 432         int len;
 433
 434 #define NLA_TYPE_SIZE(type)             nla_total_size(sizeof(type))
 435
 436         /* proto independant part */
 437         len = NLMSG_SPACE(sizeof(struct nfgenmsg))
 438                 + 3 * nla_total_size(0)         /* CTA_TUPLE_ORIG|REPL|MASTER */
 439                 + 3 * nla_total_size(0)         /* CTA_TUPLE_IP */
 440                 + 3 * nla_total_size(0)         /* CTA_TUPLE_PROTO */
 441                 + 3 * NLA_TYPE_SIZE(u_int8_t)   /* CTA_PROTO_NUM */
 442                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_ID */
 443                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_STATUS */
 444                 + 2 * nla_total_size(0)         /* CTA_COUNTERS_ORIG|REPL */
 445                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_PACKETS */
 446                 + 2 * NLA_TYPE_SIZE(uint64_t)   /* CTA_COUNTERS_BYTES */
 447                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_TIMEOUT */
 448                 + nla_total_size(0)             /* CTA_PROTOINFO */
 449                 + nla_total_size(0)             /* CTA_HELP */
 450                 + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 451                 + NLA_TYPE_SIZE(u_int32_t)      /* CTA_SECMARK */
 452                 + 2 * nla_total_size(0)         /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 453                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_POS */
 454                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_BEFORE */
 455                 + 2 * NLA_TYPE_SIZE(u_int32_t)  /* CTA_NAT_SEQ_CORRECTION_AFTER */
 456                 + NLA_TYPE_SIZE(u_int32_t);     /* CTA_MARK */
 457
 458 #undef NLA_TYPE_SIZE
 459
 460         rcu_read_lock();
 461         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 462         len += l3proto->nla_size;
 463
 464         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 465         len += l4proto->nla_size;
 466         rcu_read_unlock();
 467
 468         return alloc_skb(len, gfp);
 469 }
 470
 471 static int ctnetlink_conntrack_event(struct notifier_block *this,
 472                                      unsigned long events, void *ptr)
 473 {
 474         struct nlmsghdr *nlh;
 475         struct nfgenmsg *nfmsg;
 476         struct nlattr *nest_parms;
 477         struct nf_ct_event *item = (struct nf_ct_event *)ptr;
 478         struct nf_conn *ct = item->ct;
 479         struct sk_buff *skb;
 480         unsigned int type;
 481         sk_buff_data_t b;
 482         unsigned int flags = 0, group;
 483
 484         /* ignore our fake conntrack entry */
 485         if (ct == &nf_conntrack_untracked)
 486                 return NOTIFY_DONE;
 487
 488         if (events & IPCT_DESTROY) {
 489                 type = IPCTNL_MSG_CT_DELETE;
 490                 group = NFNLGRP_CONNTRACK_DESTROY;
 491         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 492                 type = IPCTNL_MSG_CT_NEW;
 493                 flags = NLM_F_CREATE|NLM_F_EXCL;
 494                 group = NFNLGRP_CONNTRACK_NEW;
 495         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 496                 type = IPCTNL_MSG_CT_NEW;
 497                 group = NFNLGRP_CONNTRACK_UPDATE;
 498         } else
 499                 return NOTIFY_DONE;
 500
 501         if (!item->report && !nfnetlink_has_listeners(group))
 502                 return NOTIFY_DONE;
 503
 504         skb = ctnetlink_alloc_skb(tuple(ct, IP_CT_DIR_ORIGINAL), GFP_ATOMIC);
 505         if (!skb)
 506                 return NOTIFY_DONE;
 507
 508         b = skb->tail;
 509
 510         type |= NFNL_SUBSYS_CTNETLINK << 8;
 511         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
 512         nfmsg = NLMSG_DATA(nlh);
 513
 514         nlh->nlmsg_flags    = flags;
 515         nfmsg->nfgen_family = nf_ct_l3num(ct);
 516         nfmsg->version  = NFNETLINK_V0;
 517         nfmsg->res_id   = 0;
 518
 519         rcu_read_lock();
 520         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 521         if (!nest_parms)
 522                 goto nla_put_failure;
 523         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 524                 goto nla_put_failure;
 525         nla_nest_end(skb, nest_parms);
 526
 527         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 528         if (!nest_parms)
 529                 goto nla_put_failure;
 530         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 531                 goto nla_put_failure;
 532         nla_nest_end(skb, nest_parms);
 533
 534         if (ctnetlink_dump_id(skb, ct) < 0)
 535                 goto nla_put_failure;
 536
 537         if (ctnetlink_dump_status(skb, ct) < 0)
 538                 goto nla_put_failure;
 539
 540         if (events & IPCT_DESTROY) {
 541                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 542                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 543                         goto nla_put_failure;
 544         } else {
 545                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 546                         goto nla_put_failure;
 547
 548                 if (events & IPCT_PROTOINFO
 549                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 550                         goto nla_put_failure;
 551
 552                 if ((events & IPCT_HELPER || nfct_help(ct))
 553                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 554                         goto nla_put_failure;
 555
 556 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 557                 if ((events & IPCT_SECMARK || ct->secmark)
 558                     && ctnetlink_dump_secmark(skb, ct) < 0)
 559                         goto nla_put_failure;
 560 #endif
 561
 562                 if (events & IPCT_RELATED &&
 563                     ctnetlink_dump_master(skb, ct) < 0)
 564                         goto nla_put_failure;
 565
 566                 if (events & IPCT_NATSEQADJ &&
 567                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 568                         goto nla_put_failure;
 569         }
 570
 571 #ifdef CONFIG_NF_CONNTRACK_MARK
 572         if ((events & IPCT_MARK || ct->mark)
 573             && ctnetlink_dump_mark(skb, ct) < 0)
 574                 goto nla_put_failure;
 575 #endif
 576         rcu_read_unlock();
 577
 578         nlh->nlmsg_len = skb->tail - b;
 579         nfnetlink_send(skb, item->pid, group, item->report);
 580         return NOTIFY_DONE;
 581
 582 nla_put_failure:
 583         rcu_read_unlock();
 584 nlmsg_failure:
 585         nfnetlink_set_err(0, group, -ENOBUFS);
 586         kfree_skb(skb);
 587         return NOTIFY_DONE;
 588 }
 589 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 590
 591 static int ctnetlink_done(struct netlink_callback *cb)
 592 {
 593         if (cb->args[1])
 594                 nf_ct_put((struct nf_conn *)cb->args[1]);
 595         return 0;
 596 }
 597
 598 static int
 599 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 600 {
 601         struct nf_conn *ct, *last;
 602         struct nf_conntrack_tuple_hash *h;
 603         struct hlist_nulls_node *n;
 604         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 605         u_int8_t l3proto = nfmsg->nfgen_family;
 606
 607         rcu_read_lock();
 608         last = (struct nf_conn *)cb->args[1];
 609         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 610 restart:
 611                 hlist_nulls_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 612                                          hnnode) {
 613                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 614                                 continue;
 615                         ct = nf_ct_tuplehash_to_ctrack(h);
 616                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 617                                 continue;
 618                         /* Dump entries of a given L3 protocol number.
 619                          * If it is not specified, ie. l3proto == 0,
 620                          * then dump everything. */
 621                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 622                                 goto releasect;
 623                         if (cb->args[1]) {
 624                                 if (ct != last)
 625                                         goto releasect;
 626                                 cb->args[1] = 0;
 627                         }
 628                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 629                                                 cb->nlh->nlmsg_seq,
 630                                                 IPCTNL_MSG_CT_NEW,
 631                                                 1, ct) < 0) {
 632                                 cb->args[1] = (unsigned long)ct;
 633                                 goto out;
 634                         }
 635
 636                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 637                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 638                                 struct nf_conn_counter *acct;
 639
 640                                 acct = nf_conn_acct_find(ct);
 641                                 if (acct)
 642                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 643                         }
 644 releasect:
 645                 nf_ct_put(ct);
 646                 }
 647                 if (cb->args[1]) {
 648                         cb->args[1] = 0;
 649                         goto restart;
 650                 }
 651         }
 652 out:
 653         rcu_read_unlock();
 654         if (last)
 655                 nf_ct_put(last);
 656
 657         return skb->len;
 658 }
 659
 660 static inline int
 661 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 662 {
 663         struct nlattr *tb[CTA_IP_MAX+1];
 664         struct nf_conntrack_l3proto *l3proto;
 665         int ret = 0;
 666
 667         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 668
 669         rcu_read_lock();
 670         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 671
 672         if (likely(l3proto->nlattr_to_tuple)) {
 673                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 674                                           l3proto->nla_policy);
 675                 if (ret == 0)
 676                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 677         }
 678
 679         rcu_read_unlock();
 680
 681         return ret;
 682 }
 683
 684 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 685         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 686 };
 687
 688 static inline int
 689 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 690                             struct nf_conntrack_tuple *tuple)
 691 {
 692         struct nlattr *tb[CTA_PROTO_MAX+1];
 693         struct nf_conntrack_l4proto *l4proto;
 694         int ret = 0;
 695
 696         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 697         if (ret < 0)
 698                 return ret;
 699
 700         if (!tb[CTA_PROTO_NUM])
 701                 return -EINVAL;
 702         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 703
 704         rcu_read_lock();
 705         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 706
 707         if (likely(l4proto->nlattr_to_tuple)) {
 708                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 709                                           l4proto->nla_policy);
 710                 if (ret == 0)
 711                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 712         }
 713
 714         rcu_read_unlock();
 715
 716         return ret;
 717 }
 718
 719 static int
 720 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 721                       enum ctattr_tuple type, u_int8_t l3num)
 722 {
 723         struct nlattr *tb[CTA_TUPLE_MAX+1];
 724         int err;
 725
 726         memset(tuple, 0, sizeof(*tuple));
 727
 728         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 729
 730         if (!tb[CTA_TUPLE_IP])
 731                 return -EINVAL;
 732
 733         tuple->src.l3num = l3num;
 734
 735         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 736         if (err < 0)
 737                 return err;
 738
 739         if (!tb[CTA_TUPLE_PROTO])
 740                 return -EINVAL;
 741
 742         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 743         if (err < 0)
 744                 return err;
 745
 746         /* orig and expect tuples get DIR_ORIGINAL */
 747         if (type == CTA_TUPLE_REPLY)
 748                 tuple->dst.dir = IP_CT_DIR_REPLY;
 749         else
 750                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 751
 752         return 0;
 753 }
 754
 755 static inline int
 756 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 757 {
 758         struct nlattr *tb[CTA_HELP_MAX+1];
 759
 760         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 761
 762         if (!tb[CTA_HELP_NAME])
 763                 return -EINVAL;
 764
 765         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 766
 767         return 0;
 768 }
 769
 770 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 771         [CTA_STATUS]            = { .type = NLA_U32 },
 772         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 773         [CTA_MARK]              = { .type = NLA_U32 },
 774         [CTA_USE]               = { .type = NLA_U32 },
 775         [CTA_ID]                = { .type = NLA_U32 },
 776 };
 777
 778 static int
 779 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 780                         struct nlmsghdr *nlh, struct nlattr *cda[])
 781 {
 782         struct nf_conntrack_tuple_hash *h;
 783         struct nf_conntrack_tuple tuple;
 784         struct nf_conn *ct;
 785         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 786         u_int8_t u3 = nfmsg->nfgen_family;
 787         int err = 0;
 788
 789         if (cda[CTA_TUPLE_ORIG])
 790                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 791         else if (cda[CTA_TUPLE_REPLY])
 792                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 793         else {
 794                 /* Flush the whole table */
 795                 nf_conntrack_flush(&init_net,
 796                                    NETLINK_CB(skb).pid,
 797                                    nlmsg_report(nlh));
 798                 return 0;
 799         }
 800
 801         if (err < 0)
 802                 return err;
 803
 804         h = nf_conntrack_find_get(&init_net, &tuple);
 805         if (!h)
 806                 return -ENOENT;
 807
 808         ct = nf_ct_tuplehash_to_ctrack(h);
 809
 810         if (cda[CTA_ID]) {
 811                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 812                 if (id != (u32)(unsigned long)ct) {
 813                         nf_ct_put(ct);
 814                         return -ENOENT;
 815                 }
 816         }
 817
 818         nf_conntrack_event_report(IPCT_DESTROY,
 819                                   ct,
 820                                   NETLINK_CB(skb).pid,
 821                                   nlmsg_report(nlh));
 822
 823         /* death_by_timeout would report the event again */
 824         set_bit(IPS_DYING_BIT, &ct->status);
 825
 826         nf_ct_kill(ct);
 827         nf_ct_put(ct);
 828
 829         return 0;
 830 }
 831
 832 static int
 833 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 834                         struct nlmsghdr *nlh, struct nlattr *cda[])
 835 {
 836         struct nf_conntrack_tuple_hash *h;
 837         struct nf_conntrack_tuple tuple;
 838         struct nf_conn *ct;
 839         struct sk_buff *skb2 = NULL;
 840         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 841         u_int8_t u3 = nfmsg->nfgen_family;
 842         int err = 0;
 843
 844         if (nlh->nlmsg_flags & NLM_F_DUMP)
 845                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 846                                           ctnetlink_done);
 847
 848         if (cda[CTA_TUPLE_ORIG])
 849                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 850         else if (cda[CTA_TUPLE_REPLY])
 851                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 852         else
 853                 return -EINVAL;
 854
 855         if (err < 0)
 856                 return err;
 857
 858         h = nf_conntrack_find_get(&init_net, &tuple);
 859         if (!h)
 860                 return -ENOENT;
 861
 862         ct = nf_ct_tuplehash_to_ctrack(h);
 863
 864         err = -ENOMEM;
 865         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 866         if (!skb2) {
 867                 nf_ct_put(ct);
 868                 return -ENOMEM;
 869         }
 870
 871         rcu_read_lock();
 872         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 873                                   IPCTNL_MSG_CT_NEW, 1, ct);
 874         rcu_read_unlock();
 875         nf_ct_put(ct);
 876         if (err <= 0)
 877                 goto free;
 878
 879         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 880         if (err < 0)
 881                 goto out;
 882
 883         return 0;
 884
 885 free:
 886         kfree_skb(skb2);
 887 out:
 888         return err;
 889 }
 890
 891 #ifdef CONFIG_NF_NAT_NEEDED
 892 static int
 893 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 894                           enum nf_nat_manip_type manip,
 895                           struct nlattr *attr)
 896 {
 897         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 898
 899         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 900         if (!parse_nat_setup) {
 901 #ifdef CONFIG_MODULES
 902                 rcu_read_unlock();
 903                 spin_unlock_bh(&nf_conntrack_lock);
 904                 nfnl_unlock();
 905                 if (request_module("nf-nat-ipv4") < 0) {
 906                         nfnl_lock();
 907                         spin_lock_bh(&nf_conntrack_lock);
 908                         rcu_read_lock();
 909                         return -EOPNOTSUPP;
 910                 }
 911                 nfnl_lock();
 912                 spin_lock_bh(&nf_conntrack_lock);
 913                 rcu_read_lock();
 914                 if (nfnetlink_parse_nat_setup_hook)
 915                         return -EAGAIN;
 916 #endif
 917                 return -EOPNOTSUPP;
 918         }
 919
 920         return parse_nat_setup(ct, manip, attr);
 921 }
 922 #endif
 923
 924 static int
 925 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 926 {
 927         unsigned long d;
 928         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 929         d = ct->status ^ status;
 930
 931         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 932                 /* unchangeable */
 933                 return -EBUSY;
 934
 935         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 936                 /* SEEN_REPLY bit can only be set */
 937                 return -EBUSY;
 938
 939         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 940                 /* ASSURED bit can only be set */
 941                 return -EBUSY;
 942
 943         /* Be careful here, modifying NAT bits can screw up things,
 944          * so don't let users modify them directly if they don't pass
 945          * nf_nat_range. */
 946         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 947         return 0;
 948 }
 949
 950 static int
 951 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 952 {
 953 #ifdef CONFIG_NF_NAT_NEEDED
 954         int ret;
 955
 956         if (cda[CTA_NAT_DST]) {
 957                 ret = ctnetlink_parse_nat_setup(ct,
 958                                                 IP_NAT_MANIP_DST,
 959                                                 cda[CTA_NAT_DST]);
 960                 if (ret < 0)
 961                         return ret;
 962         }
 963         if (cda[CTA_NAT_SRC]) {
 964                 ret = ctnetlink_parse_nat_setup(ct,
 965                                                 IP_NAT_MANIP_SRC,
 966                                                 cda[CTA_NAT_SRC]);
 967                 if (ret < 0)
 968                         return ret;
 969         }
 970         return 0;
 971 #else
 972         return -EOPNOTSUPP;
 973 #endif
 974 }
 975
 976 static inline int
 977 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 978 {
 979         struct nf_conntrack_helper *helper;
 980         struct nf_conn_help *help = nfct_help(ct);
 981         char *helpname;
 982         int err;
 983
 984         /* don't change helper of sibling connections */
 985         if (ct->master)
 986                 return -EBUSY;
 987
 988         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 989         if (err < 0)
 990                 return err;
 991
 992         if (!strcmp(helpname, "")) {
 993                 if (help && help->helper) {
 994                         /* we had a helper before ... */
 995                         nf_ct_remove_expectations(ct);
 996                         rcu_assign_pointer(help->helper, NULL);
 997                 }
 998
 999                 return 0;
1000         }
1001
1002         helper = __nf_conntrack_helper_find_byname(helpname);
1003         if (helper == NULL) {
1004 #ifdef CONFIG_MODULES
1005                 spin_unlock_bh(&nf_conntrack_lock);
1006
1007                 if (request_module("nfct-helper-%s", helpname) < 0) {
1008                         spin_lock_bh(&nf_conntrack_lock);
1009                         return -EOPNOTSUPP;
1010                 }
1011
1012                 spin_lock_bh(&nf_conntrack_lock);
1013                 helper = __nf_conntrack_helper_find_byname(helpname);
1014                 if (helper)
1015                         return -EAGAIN;
1016 #endif
1017                 return -EOPNOTSUPP;
1018         }
1019
1020         if (help) {
1021                 if (help->helper == helper)
1022                         return 0;
1023                 if (help->helper)
1024                         return -EBUSY;
1025                 /* need to zero data of old helper */
1026                 memset(&help->help, 0, sizeof(help->help));
1027         } else {
1028                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1029                 if (help == NULL)
1030                         return -ENOMEM;
1031         }
1032
1033         rcu_assign_pointer(help->helper, helper);
1034
1035         return 0;
1036 }
1037
1038 static inline int
1039 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
1040 {
1041         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1042
1043         if (!del_timer(&ct->timeout))
1044                 return -ETIME;
1045
1046         ct->timeout.expires = jiffies + timeout * HZ;
1047         add_timer(&ct->timeout);
1048
1049         return 0;
1050 }
1051
1052 static inline int
1053 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
1054 {
1055         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
1056         struct nf_conntrack_l4proto *l4proto;
1057         int err = 0;
1058
1059         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
1060
1061         rcu_read_lock();
1062         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1063         if (l4proto->from_nlattr)
1064                 err = l4proto->from_nlattr(tb, ct);
1065         rcu_read_unlock();
1066
1067         return err;
1068 }
1069
1070 #ifdef CONFIG_NF_NAT_NEEDED
1071 static inline int
1072 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
1073 {
1074         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1075
1076         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
1077
1078         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1079                 return -EINVAL;
1080
1081         natseq->correction_pos =
1082                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1083
1084         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1085                 return -EINVAL;
1086
1087         natseq->offset_before =
1088                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1089
1090         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1091                 return -EINVAL;
1092
1093         natseq->offset_after =
1094                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1095
1096         return 0;
1097 }
1098
1099 static int
1100 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1101 {
1102         int ret = 0;
1103         struct nf_conn_nat *nat = nfct_nat(ct);
1104
1105         if (!nat)
1106                 return 0;
1107
1108         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1109                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1110                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1111                 if (ret < 0)
1112                         return ret;
1113
1114                 ct->status |= IPS_SEQ_ADJUST;
1115         }
1116
1117         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1118                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1119                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1120                 if (ret < 0)
1121                         return ret;
1122
1123                 ct->status |= IPS_SEQ_ADJUST;
1124         }
1125
1126         return 0;
1127 }
1128 #endif
1129
1130 static int
1131 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1132 {
1133         int err;
1134
1135         /* only allow NAT changes and master assignation for new conntracks */
1136         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1137                 return -EOPNOTSUPP;
1138
1139         if (cda[CTA_HELP]) {
1140                 err = ctnetlink_change_helper(ct, cda);
1141                 if (err < 0)
1142                         return err;
1143         }
1144
1145         if (cda[CTA_TIMEOUT]) {
1146                 err = ctnetlink_change_timeout(ct, cda);
1147                 if (err < 0)
1148                         return err;
1149         }
1150
1151         if (cda[CTA_STATUS]) {
1152                 err = ctnetlink_change_status(ct, cda);
1153                 if (err < 0)
1154                         return err;
1155         }
1156
1157         if (cda[CTA_PROTOINFO]) {
1158                 err = ctnetlink_change_protoinfo(ct, cda);
1159                 if (err < 0)
1160                         return err;
1161         }
1162
1163 #if defined(CONFIG_NF_CONNTRACK_MARK)
1164         if (cda[CTA_MARK])
1165                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1166 #endif
1167
1168 #ifdef CONFIG_NF_NAT_NEEDED
1169         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1170                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1171                 if (err < 0)
1172                         return err;
1173         }
1174 #endif
1175
1176         return 0;
1177 }
1178
1179 static inline void
1180 ctnetlink_event_report(struct nf_conn *ct, u32 pid, int report)
1181 {
1182         unsigned int events = 0;
1183
1184         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1185                 events |= IPCT_RELATED;
1186         else
1187                 events |= IPCT_NEW;
1188
1189         nf_conntrack_event_report(IPCT_STATUS |
1190                                   IPCT_HELPER |
1191                                   IPCT_REFRESH |
1192                                   IPCT_PROTOINFO |
1193                                   IPCT_NATSEQADJ |
1194                                   IPCT_MARK |
1195                                   events,
1196                                   ct,
1197                                   pid,
1198                                   report);
1199 }
1200
1201 static struct nf_conn *
1202 ctnetlink_create_conntrack(struct nlattr *cda[],
1203                            struct nf_conntrack_tuple *otuple,
1204                            struct nf_conntrack_tuple *rtuple,
1205                            u8 u3)
1206 {
1207         struct nf_conn *ct;
1208         int err = -EINVAL;
1209         struct nf_conntrack_helper *helper;
1210
1211         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1212         if (IS_ERR(ct))
1213                 return ERR_PTR(-ENOMEM);
1214
1215         if (!cda[CTA_TIMEOUT])
1216                 goto err1;
1217         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1218
1219         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1220         ct->status |= IPS_CONFIRMED;
1221
1222         rcu_read_lock();
1223         if (cda[CTA_HELP]) {
1224                 char *helpname;
1225
1226                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1227                 if (err < 0)
1228                         goto err2;
1229
1230                 helper = __nf_conntrack_helper_find_byname(helpname);
1231                 if (helper == NULL) {
1232                         rcu_read_unlock();
1233 #ifdef CONFIG_MODULES
1234                         if (request_module("nfct-helper-%s", helpname) < 0) {
1235                                 err = -EOPNOTSUPP;
1236                                 goto err1;
1237                         }
1238
1239                         rcu_read_lock();
1240                         helper = __nf_conntrack_helper_find_byname(helpname);
1241                         if (helper) {
1242                                 err = -EAGAIN;
1243                                 goto err2;
1244                         }
1245                         rcu_read_unlock();
1246 #endif
1247                         err = -EOPNOTSUPP;
1248                         goto err1;
1249                 } else {
1250                         struct nf_conn_help *help;
1251
1252                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1253                         if (help == NULL) {
1254                                 err = -ENOMEM;
1255                                 goto err2;
1256                         }
1257
1258                         /* not in hash table yet so not strictly necessary */
1259                         rcu_assign_pointer(help->helper, helper);
1260                 }
1261         } else {
1262                 /* try an implicit helper assignation */
1263                 err = __nf_ct_try_assign_helper(ct, GFP_ATOMIC);
1264                 if (err < 0)
1265                         goto err2;
1266         }
1267
1268         if (cda[CTA_STATUS]) {
1269                 err = ctnetlink_change_status(ct, cda);
1270                 if (err < 0)
1271                         goto err2;
1272         }
1273
1274         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1275                 err = ctnetlink_change_nat(ct, cda);
1276                 if (err < 0)
1277                         goto err2;
1278         }
1279
1280 #ifdef CONFIG_NF_NAT_NEEDED
1281         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1282                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1283                 if (err < 0)
1284                         goto err2;
1285         }
1286 #endif
1287
1288         if (cda[CTA_PROTOINFO]) {
1289                 err = ctnetlink_change_protoinfo(ct, cda);
1290                 if (err < 0)
1291                         goto err2;
1292         }
1293
1294         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1295
1296 #if defined(CONFIG_NF_CONNTRACK_MARK)
1297         if (cda[CTA_MARK])
1298                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1299 #endif
1300
1301         /* setup master conntrack: this is a confirmed expectation */
1302         if (cda[CTA_TUPLE_MASTER]) {
1303                 struct nf_conntrack_tuple master;
1304                 struct nf_conntrack_tuple_hash *master_h;
1305                 struct nf_conn *master_ct;
1306
1307                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1308                 if (err < 0)
1309                         goto err2;
1310
1311                 master_h = nf_conntrack_find_get(&init_net, &master);
1312                 if (master_h == NULL) {
1313                         err = -ENOENT;
1314                         goto err2;
1315                 }
1316                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1317                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1318                 ct->master = master_ct;
1319         }
1320
1321         add_timer(&ct->timeout);
1322         nf_conntrack_hash_insert(ct);
1323         rcu_read_unlock();
1324
1325         return ct;
1326
1327 err2:
1328         rcu_read_unlock();
1329 err1:
1330         nf_conntrack_free(ct);
1331         return ERR_PTR(err);
1332 }
1333
1334 static int
1335 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1336                         struct nlmsghdr *nlh, struct nlattr *cda[])
1337 {
1338         struct nf_conntrack_tuple otuple, rtuple;
1339         struct nf_conntrack_tuple_hash *h = NULL;
1340         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1341         u_int8_t u3 = nfmsg->nfgen_family;
1342         int err = 0;
1343
1344         if (cda[CTA_TUPLE_ORIG]) {
1345                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1346                 if (err < 0)
1347                         return err;
1348         }
1349
1350         if (cda[CTA_TUPLE_REPLY]) {
1351                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1352                 if (err < 0)
1353                         return err;
1354         }
1355
1356         spin_lock_bh(&nf_conntrack_lock);
1357         if (cda[CTA_TUPLE_ORIG])
1358                 h = __nf_conntrack_find(&init_net, &otuple);
1359         else if (cda[CTA_TUPLE_REPLY])
1360                 h = __nf_conntrack_find(&init_net, &rtuple);
1361
1362         if (h == NULL) {
1363                 err = -ENOENT;
1364                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1365                         struct nf_conn *ct;
1366
1367                         ct = ctnetlink_create_conntrack(cda, &otuple,
1368                                                         &rtuple, u3);
1369                         if (IS_ERR(ct)) {
1370                                 err = PTR_ERR(ct);
1371                                 goto out_unlock;
1372                         }
1373                         err = 0;
1374                         nf_conntrack_get(&ct->ct_general);
1375                         spin_unlock_bh(&nf_conntrack_lock);
1376                         ctnetlink_event_report(ct,
1377                                                NETLINK_CB(skb).pid,
1378                                                nlmsg_report(nlh));
1379                         nf_ct_put(ct);
1380                 } else
1381                         spin_unlock_bh(&nf_conntrack_lock);
1382
1383                 return err;
1384         }
1385         /* implicit 'else' */
1386
1387         /* We manipulate the conntrack inside the global conntrack table lock,
1388          * so there's no need to increase the refcount */
1389         err = -EEXIST;
1390         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1391                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1392
1393                 err = ctnetlink_change_conntrack(ct, cda);
1394                 if (err == 0) {
1395                         nf_conntrack_get(&ct->ct_general);
1396                         spin_unlock_bh(&nf_conntrack_lock);
1397                         ctnetlink_event_report(ct,
1398                                                NETLINK_CB(skb).pid,
1399                                                nlmsg_report(nlh));
1400                         nf_ct_put(ct);
1401                 } else
1402                         spin_unlock_bh(&nf_conntrack_lock);
1403
1404                 return err;
1405         }
1406
1407 out_unlock:
1408         spin_unlock_bh(&nf_conntrack_lock);
1409         return err;
1410 }
1411
1412 /***********************************************************************
1413  * EXPECT
1414  ***********************************************************************/
1415
1416 static inline int
1417 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1418                          const struct nf_conntrack_tuple *tuple,
1419                          enum ctattr_expect type)
1420 {
1421         struct nlattr *nest_parms;
1422
1423         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1424         if (!nest_parms)
1425                 goto nla_put_failure;
1426         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1427                 goto nla_put_failure;
1428         nla_nest_end(skb, nest_parms);
1429
1430         return 0;
1431
1432 nla_put_failure:
1433         return -1;
1434 }
1435
1436 static inline int
1437 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1438                         const struct nf_conntrack_tuple *tuple,
1439                         const struct nf_conntrack_tuple_mask *mask)
1440 {
1441         int ret;
1442         struct nf_conntrack_l3proto *l3proto;
1443         struct nf_conntrack_l4proto *l4proto;
1444         struct nf_conntrack_tuple m;
1445         struct nlattr *nest_parms;
1446
1447         memset(&m, 0xFF, sizeof(m));
1448         m.src.u.all = mask->src.u.all;
1449         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1450
1451         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1452         if (!nest_parms)
1453                 goto nla_put_failure;
1454
1455         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1456         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1457
1458         if (unlikely(ret < 0))
1459                 goto nla_put_failure;
1460
1461         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1462         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1463         if (unlikely(ret < 0))
1464                 goto nla_put_failure;
1465
1466         nla_nest_end(skb, nest_parms);
1467
1468         return 0;
1469
1470 nla_put_failure:
1471         return -1;
1472 }
1473
1474 static int
1475 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1476                           const struct nf_conntrack_expect *exp)
1477 {
1478         struct nf_conn *master = exp->master;
1479         long timeout = (exp->timeout.expires - jiffies) / HZ;
1480
1481         if (timeout < 0)
1482                 timeout = 0;
1483
1484         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1485                 goto nla_put_failure;
1486         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1487                 goto nla_put_failure;
1488         if (ctnetlink_exp_dump_tuple(skb,
1489                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1490                                  CTA_EXPECT_MASTER) < 0)
1491                 goto nla_put_failure;
1492
1493         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1494         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1495
1496         return 0;
1497
1498 nla_put_failure:
1499         return -1;
1500 }
1501
1502 static int
1503 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1504                     int event,
1505                     int nowait,
1506                     const struct nf_conntrack_expect *exp)
1507 {
1508         struct nlmsghdr *nlh;
1509         struct nfgenmsg *nfmsg;
1510         unsigned char *b = skb_tail_pointer(skb);
1511
1512         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1513         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1514         nfmsg  = NLMSG_DATA(nlh);
1515
1516         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1517         nfmsg->nfgen_family = exp->tuple.src.l3num;
1518         nfmsg->version      = NFNETLINK_V0;
1519         nfmsg->res_id       = 0;
1520
1521         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1522                 goto nla_put_failure;
1523
1524         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1525         return skb->len;
1526
1527 nlmsg_failure:
1528 nla_put_failure:
1529         nlmsg_trim(skb, b);
1530         return -1;
1531 }
1532
1533 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1534 static int ctnetlink_expect_event(struct notifier_block *this,
1535                                   unsigned long events, void *ptr)
1536 {
1537         struct nlmsghdr *nlh;
1538         struct nfgenmsg *nfmsg;
1539         struct nf_exp_event *item = (struct nf_exp_event *)ptr;
1540         struct nf_conntrack_expect *exp = item->exp;
1541         struct sk_buff *skb;
1542         unsigned int type;
1543         sk_buff_data_t b;
1544         int flags = 0;
1545
1546         if (events & IPEXP_NEW) {
1547                 type = IPCTNL_MSG_EXP_NEW;
1548                 flags = NLM_F_CREATE|NLM_F_EXCL;
1549         } else
1550                 return NOTIFY_DONE;
1551
1552         if (!item->report &&
1553             !nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1554                 return NOTIFY_DONE;
1555
1556         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1557         if (!skb)
1558                 return NOTIFY_DONE;
1559
1560         b = skb->tail;
1561
1562         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1563         nlh   = NLMSG_PUT(skb, item->pid, 0, type, sizeof(struct nfgenmsg));
1564         nfmsg = NLMSG_DATA(nlh);
1565
1566         nlh->nlmsg_flags    = flags;
1567         nfmsg->nfgen_family = exp->tuple.src.l3num;
1568         nfmsg->version      = NFNETLINK_V0;
1569         nfmsg->res_id       = 0;
1570
1571         rcu_read_lock();
1572         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1573                 goto nla_put_failure;
1574         rcu_read_unlock();
1575
1576         nlh->nlmsg_len = skb->tail - b;
1577         nfnetlink_send(skb, item->pid, NFNLGRP_CONNTRACK_EXP_NEW, item->report);
1578         return NOTIFY_DONE;
1579
1580 nla_put_failure:
1581         rcu_read_unlock();
1582 nlmsg_failure:
1583         nfnetlink_set_err(0, 0, -ENOBUFS);
1584         kfree_skb(skb);
1585         return NOTIFY_DONE;
1586 }
1587 #endif
1588 static int ctnetlink_exp_done(struct netlink_callback *cb)
1589 {
1590         if (cb->args[1])
1591                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1592         return 0;
1593 }
1594
1595 static int
1596 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1597 {
1598         struct net *net = &init_net;
1599         struct nf_conntrack_expect *exp, *last;
1600         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1601         struct hlist_node *n;
1602         u_int8_t l3proto = nfmsg->nfgen_family;
1603
1604         rcu_read_lock();
1605         last = (struct nf_conntrack_expect *)cb->args[1];
1606         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1607 restart:
1608                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1609                                      hnode) {
1610                         if (l3proto && exp->tuple.src.l3num != l3proto)
1611                                 continue;
1612                         if (cb->args[1]) {
1613                                 if (exp != last)
1614                                         continue;
1615                                 cb->args[1] = 0;
1616                         }
1617                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1618                                                     cb->nlh->nlmsg_seq,
1619                                                     IPCTNL_MSG_EXP_NEW,
1620                                                     1, exp) < 0) {
1621                                 if (!atomic_inc_not_zero(&exp->use))
1622                                         continue;
1623                                 cb->args[1] = (unsigned long)exp;
1624                                 goto out;
1625                         }
1626                 }
1627                 if (cb->args[1]) {
1628                         cb->args[1] = 0;
1629                         goto restart;
1630                 }
1631         }
1632 out:
1633         rcu_read_unlock();
1634         if (last)
1635                 nf_ct_expect_put(last);
1636
1637         return skb->len;
1638 }
1639
1640 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1641         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1642         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1643 };
1644
1645 static int
1646 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1647                      struct nlmsghdr *nlh, struct nlattr *cda[])
1648 {
1649         struct nf_conntrack_tuple tuple;
1650         struct nf_conntrack_expect *exp;
1651         struct sk_buff *skb2;
1652         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1653         u_int8_t u3 = nfmsg->nfgen_family;
1654         int err = 0;
1655
1656         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1657                 return netlink_dump_start(ctnl, skb, nlh,
1658                                           ctnetlink_exp_dump_table,
1659                                           ctnetlink_exp_done);
1660         }
1661
1662         if (cda[CTA_EXPECT_MASTER])
1663                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1664         else
1665                 return -EINVAL;
1666
1667         if (err < 0)
1668                 return err;
1669
1670         exp = nf_ct_expect_find_get(&init_net, &tuple);
1671         if (!exp)
1672                 return -ENOENT;
1673
1674         if (cda[CTA_EXPECT_ID]) {
1675                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1676                 if (ntohl(id) != (u32)(unsigned long)exp) {
1677                         nf_ct_expect_put(exp);
1678                         return -ENOENT;
1679                 }
1680         }
1681
1682         err = -ENOMEM;
1683         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1684         if (!skb2)
1685                 goto out;
1686
1687         rcu_read_lock();
1688         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1689                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1690                                       1, exp);
1691         rcu_read_unlock();
1692         if (err <= 0)
1693                 goto free;
1694
1695         nf_ct_expect_put(exp);
1696
1697         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1698
1699 free:
1700         kfree_skb(skb2);
1701 out:
1702         nf_ct_expect_put(exp);
1703         return err;
1704 }
1705
1706 static int
1707 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1708                      struct nlmsghdr *nlh, struct nlattr *cda[])
1709 {
1710         struct nf_conntrack_expect *exp;
1711         struct nf_conntrack_tuple tuple;
1712         struct nf_conntrack_helper *h;
1713         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1714         struct hlist_node *n, *next;
1715         u_int8_t u3 = nfmsg->nfgen_family;
1716         unsigned int i;
1717         int err;
1718
1719         if (cda[CTA_EXPECT_TUPLE]) {
1720                 /* delete a single expect by tuple */
1721                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1722                 if (err < 0)
1723                         return err;
1724
1725                 /* bump usage count to 2 */
1726                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1727                 if (!exp)
1728                         return -ENOENT;
1729
1730                 if (cda[CTA_EXPECT_ID]) {
1731                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1732                         if (ntohl(id) != (u32)(unsigned long)exp) {
1733                                 nf_ct_expect_put(exp);
1734                                 return -ENOENT;
1735                         }
1736                 }
1737
1738                 /* after list removal, usage count == 1 */
1739                 nf_ct_unexpect_related(exp);
1740                 /* have to put what we 'get' above.
1741                  * after this line usage count == 0 */
1742                 nf_ct_expect_put(exp);
1743         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1744                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1745                 struct nf_conn_help *m_help;
1746
1747                 /* delete all expectations for this helper */
1748                 spin_lock_bh(&nf_conntrack_lock);
1749                 h = __nf_conntrack_helper_find_byname(name);
1750                 if (!h) {
1751                         spin_unlock_bh(&nf_conntrack_lock);
1752                         return -EOPNOTSUPP;
1753                 }
1754                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1755                         hlist_for_each_entry_safe(exp, n, next,
1756                                                   &init_net.ct.expect_hash[i],
1757                                                   hnode) {
1758                                 m_help = nfct_help(exp->master);
1759                                 if (m_help->helper == h
1760                                     && del_timer(&exp->timeout)) {
1761                                         nf_ct_unlink_expect(exp);
1762                                         nf_ct_expect_put(exp);
1763                                 }
1764                         }
1765                 }
1766                 spin_unlock_bh(&nf_conntrack_lock);
1767         } else {
1768                 /* This basically means we have to flush everything*/
1769                 spin_lock_bh(&nf_conntrack_lock);
1770                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1771                         hlist_for_each_entry_safe(exp, n, next,
1772                                                   &init_net.ct.expect_hash[i],
1773                                                   hnode) {
1774                                 if (del_timer(&exp->timeout)) {
1775                                         nf_ct_unlink_expect(exp);
1776                                         nf_ct_expect_put(exp);
1777                                 }
1778                         }
1779                 }
1780                 spin_unlock_bh(&nf_conntrack_lock);
1781         }
1782
1783         return 0;
1784 }
1785 static int
1786 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1787 {
1788         return -EOPNOTSUPP;
1789 }
1790
1791 static int
1792 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3, u32 pid, int report)
1793 {
1794         struct nf_conntrack_tuple tuple, mask, master_tuple;
1795         struct nf_conntrack_tuple_hash *h = NULL;
1796         struct nf_conntrack_expect *exp;
1797         struct nf_conn *ct;
1798         struct nf_conn_help *help;
1799         int err = 0;
1800
1801         /* caller guarantees that those three CTA_EXPECT_* exist */
1802         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1803         if (err < 0)
1804                 return err;
1805         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1806         if (err < 0)
1807                 return err;
1808         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1809         if (err < 0)
1810                 return err;
1811
1812         /* Look for master conntrack of this expectation */
1813         h = nf_conntrack_find_get(&init_net, &master_tuple);
1814         if (!h)
1815                 return -ENOENT;
1816         ct = nf_ct_tuplehash_to_ctrack(h);
1817         help = nfct_help(ct);
1818
1819         if (!help || !help->helper) {
1820                 /* such conntrack hasn't got any helper, abort */
1821                 err = -EOPNOTSUPP;
1822                 goto out;
1823         }
1824
1825         exp = nf_ct_expect_alloc(ct);
1826         if (!exp) {
1827                 err = -ENOMEM;
1828                 goto out;
1829         }
1830
1831         exp->expectfn = NULL;
1832         exp->flags = 0;
1833         exp->master = ct;
1834         exp->helper = NULL;
1835         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1836         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1837         exp->mask.src.u.all = mask.src.u.all;
1838
1839         err = nf_ct_expect_related_report(exp, pid, report);
1840         nf_ct_expect_put(exp);
1841
1842 out:
1843         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1844         return err;
1845 }
1846
1847 static int
1848 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1849                      struct nlmsghdr *nlh, struct nlattr *cda[])
1850 {
1851         struct nf_conntrack_tuple tuple;
1852         struct nf_conntrack_expect *exp;
1853         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1854         u_int8_t u3 = nfmsg->nfgen_family;
1855         int err = 0;
1856
1857         if (!cda[CTA_EXPECT_TUPLE]
1858             || !cda[CTA_EXPECT_MASK]
1859             || !cda[CTA_EXPECT_MASTER])
1860                 return -EINVAL;
1861
1862         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1863         if (err < 0)
1864                 return err;
1865
1866         spin_lock_bh(&nf_conntrack_lock);
1867         exp = __nf_ct_expect_find(&init_net, &tuple);
1868
1869         if (!exp) {
1870                 spin_unlock_bh(&nf_conntrack_lock);
1871                 err = -ENOENT;
1872                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1873                         err = ctnetlink_create_expect(cda,
1874                                                       u3,
1875                                                       NETLINK_CB(skb).pid,
1876                                                       nlmsg_report(nlh));
1877                 }
1878                 return err;
1879         }
1880
1881         err = -EEXIST;
1882         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1883                 err = ctnetlink_change_expect(exp, cda);
1884         spin_unlock_bh(&nf_conntrack_lock);
1885
1886         return err;
1887 }
1888
1889 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1890 static struct notifier_block ctnl_notifier = {
1891         .notifier_call  = ctnetlink_conntrack_event,
1892 };
1893
1894 static struct notifier_block ctnl_notifier_exp = {
1895         .notifier_call  = ctnetlink_expect_event,
1896 };
1897 #endif
1898
1899 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1900         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1901                                             .attr_count = CTA_MAX,
1902                                             .policy = ct_nla_policy },
1903         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1904                                             .attr_count = CTA_MAX,
1905                                             .policy = ct_nla_policy },
1906         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1907                                             .attr_count = CTA_MAX,
1908                                             .policy = ct_nla_policy },
1909         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1910                                             .attr_count = CTA_MAX,
1911                                             .policy = ct_nla_policy },
1912 };
1913
1914 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1915         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1916                                             .attr_count = CTA_EXPECT_MAX,
1917                                             .policy = exp_nla_policy },
1918         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1919                                             .attr_count = CTA_EXPECT_MAX,
1920                                             .policy = exp_nla_policy },
1921         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1922                                             .attr_count = CTA_EXPECT_MAX,
1923                                             .policy = exp_nla_policy },
1924 };
1925
1926 static const struct nfnetlink_subsystem ctnl_subsys = {
1927         .name                           = "conntrack",
1928         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1929         .cb_count                       = IPCTNL_MSG_MAX,
1930         .cb                             = ctnl_cb,
1931 };
1932
1933 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1934         .name                           = "conntrack_expect",
1935         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1936         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1937         .cb                             = ctnl_exp_cb,
1938 };
1939
1940 MODULE_ALIAS("ip_conntrack_netlink");
1941 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1942 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1943
1944 static int __init ctnetlink_init(void)
1945 {
1946         int ret;
1947
1948         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1949         ret = nfnetlink_subsys_register(&ctnl_subsys);
1950         if (ret < 0) {
1951                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1952                 goto err_out;
1953         }
1954
1955         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1956         if (ret < 0) {
1957                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1958                 goto err_unreg_subsys;
1959         }
1960
1961 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1962         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1963         if (ret < 0) {
1964                 printk("ctnetlink_init: cannot register notifier.\n");
1965                 goto err_unreg_exp_subsys;
1966         }
1967
1968         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1969         if (ret < 0) {
1970                 printk("ctnetlink_init: cannot expect register notifier.\n");
1971                 goto err_unreg_notifier;
1972         }
1973 #endif
1974
1975         return 0;
1976
1977 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1978 err_unreg_notifier:
1979         nf_conntrack_unregister_notifier(&ctnl_notifier);
1980 err_unreg_exp_subsys:
1981         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1982 #endif
1983 err_unreg_subsys:
1984         nfnetlink_subsys_unregister(&ctnl_subsys);
1985 err_out:
1986         return ret;
1987 }
1988
1989 static void __exit ctnetlink_exit(void)
1990 {
1991         printk("ctnetlink: unregistering from nfnetlink.\n");
1992
1993 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1994         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1995         nf_conntrack_unregister_notifier(&ctnl_notifier);
1996 #endif
1997
1998         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1999         nfnetlink_subsys_unregister(&ctnl_subsys);
2000         return;
2001 }
2002
2003 module_init(ctnetlink_init);
2004 module_exit(ctnetlink_exit);