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