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/types.h>
  23 #include <linux/timer.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/errno.h>
  26 #include <linux/netlink.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/notifier.h>
  30
  31 #include <linux/netfilter.h>
  32 #include <net/netlink.h>
  33 #include <net/netfilter/nf_conntrack.h>
  34 #include <net/netfilter/nf_conntrack_core.h>
  35 #include <net/netfilter/nf_conntrack_expect.h>
  36 #include <net/netfilter/nf_conntrack_helper.h>
  37 #include <net/netfilter/nf_conntrack_l3proto.h>
  38 #include <net/netfilter/nf_conntrack_l4proto.h>
  39 #include <net/netfilter/nf_conntrack_tuple.h>
  40 #include <net/netfilter/nf_conntrack_acct.h>
  41 #ifdef CONFIG_NF_NAT_NEEDED
  42 #include <net/netfilter/nf_nat_core.h>
  43 #include <net/netfilter/nf_nat_protocol.h>
  44 #endif
  45
  46 #include <linux/netfilter/nfnetlink.h>
  47 #include <linux/netfilter/nfnetlink_conntrack.h>
  48
  49 MODULE_LICENSE("GPL");
  50
  51 static char __initdata version[] = "0.93";
  52
  53 static inline int
  54 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  55                             const struct nf_conntrack_tuple *tuple,
  56                             struct nf_conntrack_l4proto *l4proto)
  57 {
  58         int ret = 0;
  59         struct nlattr *nest_parms;
  60
  61         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  62         if (!nest_parms)
  63                 goto nla_put_failure;
  64         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  65
  66         if (likely(l4proto->tuple_to_nlattr))
  67                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  68
  69         nla_nest_end(skb, nest_parms);
  70
  71         return ret;
  72
  73 nla_put_failure:
  74         return -1;
  75 }
  76
  77 static inline int
  78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  79                          const struct nf_conntrack_tuple *tuple,
  80                          struct nf_conntrack_l3proto *l3proto)
  81 {
  82         int ret = 0;
  83         struct nlattr *nest_parms;
  84
  85         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  86         if (!nest_parms)
  87                 goto nla_put_failure;
  88
  89         if (likely(l3proto->tuple_to_nlattr))
  90                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  91
  92         nla_nest_end(skb, nest_parms);
  93
  94         return ret;
  95
  96 nla_put_failure:
  97         return -1;
  98 }
  99
 100 static int
 101 ctnetlink_dump_tuples(struct sk_buff *skb,
 102                       const struct nf_conntrack_tuple *tuple)
 103 {
 104         int ret;
 105         struct nf_conntrack_l3proto *l3proto;
 106         struct nf_conntrack_l4proto *l4proto;
 107
 108         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 109         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 110
 111         if (unlikely(ret < 0))
 112                 return ret;
 113
 114         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 115         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 116
 117         return ret;
 118 }
 119
 120 static inline int
 121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 122 {
 123         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 124         return 0;
 125
 126 nla_put_failure:
 127         return -1;
 128 }
 129
 130 static inline int
 131 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 132 {
 133         long timeout = (ct->timeout.expires - jiffies) / HZ;
 134
 135         if (timeout < 0)
 136                 timeout = 0;
 137
 138         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 139         return 0;
 140
 141 nla_put_failure:
 142         return -1;
 143 }
 144
 145 static inline int
 146 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 147 {
 148         struct nf_conntrack_l4proto *l4proto;
 149         struct nlattr *nest_proto;
 150         int ret;
 151
 152         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 153         if (!l4proto->to_nlattr)
 154                 return 0;
 155
 156         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 157         if (!nest_proto)
 158                 goto nla_put_failure;
 159
 160         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 161
 162         nla_nest_end(skb, nest_proto);
 163
 164         return ret;
 165
 166 nla_put_failure:
 167         return -1;
 168 }
 169
 170 static inline int
 171 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 172 {
 173         struct nlattr *nest_helper;
 174         const struct nf_conn_help *help = nfct_help(ct);
 175         struct nf_conntrack_helper *helper;
 176
 177         if (!help)
 178                 return 0;
 179
 180         helper = rcu_dereference(help->helper);
 181         if (!helper)
 182                 goto out;
 183
 184         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 185         if (!nest_helper)
 186                 goto nla_put_failure;
 187         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 188
 189         if (helper->to_nlattr)
 190                 helper->to_nlattr(skb, ct);
 191
 192         nla_nest_end(skb, nest_helper);
 193 out:
 194         return 0;
 195
 196 nla_put_failure:
 197         return -1;
 198 }
 199
 200 static int
 201 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 202                         enum ip_conntrack_dir dir)
 203 {
 204         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 205         struct nlattr *nest_count;
 206         const struct nf_conn_counter *acct;
 207
 208         acct = nf_conn_acct_find(ct);
 209         if (!acct)
 210                 return 0;
 211
 212         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 213         if (!nest_count)
 214                 goto nla_put_failure;
 215
 216         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 217                      cpu_to_be64(acct[dir].packets));
 218         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 219                      cpu_to_be64(acct[dir].bytes));
 220
 221         nla_nest_end(skb, nest_count);
 222
 223         return 0;
 224
 225 nla_put_failure:
 226         return -1;
 227 }
 228
 229 #ifdef CONFIG_NF_CONNTRACK_MARK
 230 static inline int
 231 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 232 {
 233         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 234         return 0;
 235
 236 nla_put_failure:
 237         return -1;
 238 }
 239 #else
 240 #define ctnetlink_dump_mark(a, b) (0)
 241 #endif
 242
 243 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 244 static inline int
 245 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 246 {
 247         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 248         return 0;
 249
 250 nla_put_failure:
 251         return -1;
 252 }
 253 #else
 254 #define ctnetlink_dump_secmark(a, b) (0)
 255 #endif
 256
 257 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 258
 259 static inline int
 260 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 261 {
 262         struct nlattr *nest_parms;
 263
 264         if (!(ct->status & IPS_EXPECTED))
 265                 return 0;
 266
 267         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 268         if (!nest_parms)
 269                 goto nla_put_failure;
 270         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 271                 goto nla_put_failure;
 272         nla_nest_end(skb, nest_parms);
 273
 274         return 0;
 275
 276 nla_put_failure:
 277         return -1;
 278 }
 279
 280 #ifdef CONFIG_NF_NAT_NEEDED
 281 static int
 282 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 283 {
 284         struct nlattr *nest_parms;
 285
 286         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 287         if (!nest_parms)
 288                 goto nla_put_failure;
 289
 290         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 291                      htonl(natseq->correction_pos));
 292         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 293                      htonl(natseq->offset_before));
 294         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 295                      htonl(natseq->offset_after));
 296
 297         nla_nest_end(skb, nest_parms);
 298
 299         return 0;
 300
 301 nla_put_failure:
 302         return -1;
 303 }
 304
 305 static inline int
 306 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 307 {
 308         struct nf_nat_seq *natseq;
 309         struct nf_conn_nat *nat = nfct_nat(ct);
 310
 311         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 312                 return 0;
 313
 314         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 315         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 316                 return -1;
 317
 318         natseq = &nat->seq[IP_CT_DIR_REPLY];
 319         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 320                 return -1;
 321
 322         return 0;
 323 }
 324 #else
 325 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 326 #endif
 327
 328 static inline int
 329 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 330 {
 331         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 332         return 0;
 333
 334 nla_put_failure:
 335         return -1;
 336 }
 337
 338 static inline int
 339 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 340 {
 341         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 342         return 0;
 343
 344 nla_put_failure:
 345         return -1;
 346 }
 347
 348 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 349
 350 static int
 351 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 352                     int event, int nowait,
 353                     const struct nf_conn *ct)
 354 {
 355         struct nlmsghdr *nlh;
 356         struct nfgenmsg *nfmsg;
 357         struct nlattr *nest_parms;
 358         unsigned char *b = skb_tail_pointer(skb);
 359
 360         event |= NFNL_SUBSYS_CTNETLINK << 8;
 361         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 362         nfmsg  = NLMSG_DATA(nlh);
 363
 364         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 365         nfmsg->nfgen_family = nf_ct_l3num(ct);
 366         nfmsg->version      = NFNETLINK_V0;
 367         nfmsg->res_id       = 0;
 368
 369         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 370         if (!nest_parms)
 371                 goto nla_put_failure;
 372         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 373                 goto nla_put_failure;
 374         nla_nest_end(skb, nest_parms);
 375
 376         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 377         if (!nest_parms)
 378                 goto nla_put_failure;
 379         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 380                 goto nla_put_failure;
 381         nla_nest_end(skb, nest_parms);
 382
 383         if (ctnetlink_dump_status(skb, ct) < 0 ||
 384             ctnetlink_dump_timeout(skb, ct) < 0 ||
 385             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 386             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 387             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 388             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 389             ctnetlink_dump_mark(skb, ct) < 0 ||
 390             ctnetlink_dump_secmark(skb, ct) < 0 ||
 391             ctnetlink_dump_id(skb, ct) < 0 ||
 392             ctnetlink_dump_use(skb, ct) < 0 ||
 393             ctnetlink_dump_master(skb, ct) < 0 ||
 394             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 395                 goto nla_put_failure;
 396
 397         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 398         return skb->len;
 399
 400 nlmsg_failure:
 401 nla_put_failure:
 402         nlmsg_trim(skb, b);
 403         return -1;
 404 }
 405
 406 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 407 static int ctnetlink_conntrack_event(struct notifier_block *this,
 408                                      unsigned long events, void *ptr)
 409 {
 410         struct nlmsghdr *nlh;
 411         struct nfgenmsg *nfmsg;
 412         struct nlattr *nest_parms;
 413         struct nf_conn *ct = (struct nf_conn *)ptr;
 414         struct sk_buff *skb;
 415         unsigned int type;
 416         sk_buff_data_t b;
 417         unsigned int flags = 0, group;
 418
 419         /* ignore our fake conntrack entry */
 420         if (ct == &nf_conntrack_untracked)
 421                 return NOTIFY_DONE;
 422
 423         if (events & IPCT_DESTROY) {
 424                 type = IPCTNL_MSG_CT_DELETE;
 425                 group = NFNLGRP_CONNTRACK_DESTROY;
 426         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 427                 type = IPCTNL_MSG_CT_NEW;
 428                 flags = NLM_F_CREATE|NLM_F_EXCL;
 429                 group = NFNLGRP_CONNTRACK_NEW;
 430         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 431                 type = IPCTNL_MSG_CT_NEW;
 432                 group = NFNLGRP_CONNTRACK_UPDATE;
 433         } else
 434                 return NOTIFY_DONE;
 435
 436         if (!nfnetlink_has_listeners(group))
 437                 return NOTIFY_DONE;
 438
 439         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 440         if (!skb)
 441                 return NOTIFY_DONE;
 442
 443         b = skb->tail;
 444
 445         type |= NFNL_SUBSYS_CTNETLINK << 8;
 446         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 447         nfmsg = NLMSG_DATA(nlh);
 448
 449         nlh->nlmsg_flags    = flags;
 450         nfmsg->nfgen_family = nf_ct_l3num(ct);
 451         nfmsg->version  = NFNETLINK_V0;
 452         nfmsg->res_id   = 0;
 453
 454         rcu_read_lock();
 455         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 456         if (!nest_parms)
 457                 goto nla_put_failure;
 458         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 459                 goto nla_put_failure;
 460         nla_nest_end(skb, nest_parms);
 461
 462         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 463         if (!nest_parms)
 464                 goto nla_put_failure;
 465         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 466                 goto nla_put_failure;
 467         nla_nest_end(skb, nest_parms);
 468
 469         if (ctnetlink_dump_id(skb, ct) < 0)
 470                 goto nla_put_failure;
 471
 472         if (ctnetlink_dump_status(skb, ct) < 0)
 473                 goto nla_put_failure;
 474
 475         if (events & IPCT_DESTROY) {
 476                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 477                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 478                         goto nla_put_failure;
 479         } else {
 480                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 481                         goto nla_put_failure;
 482
 483                 if (events & IPCT_PROTOINFO
 484                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 485                         goto nla_put_failure;
 486
 487                 if ((events & IPCT_HELPER || nfct_help(ct))
 488                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 489                         goto nla_put_failure;
 490
 491 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 492                 if ((events & IPCT_SECMARK || ct->secmark)
 493                     && ctnetlink_dump_secmark(skb, ct) < 0)
 494                         goto nla_put_failure;
 495 #endif
 496
 497                 if (events & IPCT_RELATED &&
 498                     ctnetlink_dump_master(skb, ct) < 0)
 499                         goto nla_put_failure;
 500
 501                 if (events & IPCT_NATSEQADJ &&
 502                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 503                         goto nla_put_failure;
 504         }
 505
 506 #ifdef CONFIG_NF_CONNTRACK_MARK
 507         if ((events & IPCT_MARK || ct->mark)
 508             && ctnetlink_dump_mark(skb, ct) < 0)
 509                 goto nla_put_failure;
 510 #endif
 511         rcu_read_unlock();
 512
 513         nlh->nlmsg_len = skb->tail - b;
 514         nfnetlink_send(skb, 0, group, 0);
 515         return NOTIFY_DONE;
 516
 517 nla_put_failure:
 518         rcu_read_unlock();
 519 nlmsg_failure:
 520         kfree_skb(skb);
 521         return NOTIFY_DONE;
 522 }
 523 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 524
 525 static int ctnetlink_done(struct netlink_callback *cb)
 526 {
 527         if (cb->args[1])
 528                 nf_ct_put((struct nf_conn *)cb->args[1]);
 529         return 0;
 530 }
 531
 532 static int
 533 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 534 {
 535         struct nf_conn *ct, *last;
 536         struct nf_conntrack_tuple_hash *h;
 537         struct hlist_node *n;
 538         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 539         u_int8_t l3proto = nfmsg->nfgen_family;
 540
 541         rcu_read_lock();
 542         last = (struct nf_conn *)cb->args[1];
 543         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 544 restart:
 545                 hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 546                                          hnode) {
 547                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 548                                 continue;
 549                         ct = nf_ct_tuplehash_to_ctrack(h);
 550                         /* Dump entries of a given L3 protocol number.
 551                          * If it is not specified, ie. l3proto == 0,
 552                          * then dump everything. */
 553                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 554                                 continue;
 555                         if (cb->args[1]) {
 556                                 if (ct != last)
 557                                         continue;
 558                                 cb->args[1] = 0;
 559                         }
 560                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 561                                                 cb->nlh->nlmsg_seq,
 562                                                 IPCTNL_MSG_CT_NEW,
 563                                                 1, ct) < 0) {
 564                                 if (!atomic_inc_not_zero(&ct->ct_general.use))
 565                                         continue;
 566                                 cb->args[1] = (unsigned long)ct;
 567                                 goto out;
 568                         }
 569
 570                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 571                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 572                                 struct nf_conn_counter *acct;
 573
 574                                 acct = nf_conn_acct_find(ct);
 575                                 if (acct)
 576                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 577                         }
 578                 }
 579                 if (cb->args[1]) {
 580                         cb->args[1] = 0;
 581                         goto restart;
 582                 }
 583         }
 584 out:
 585         rcu_read_unlock();
 586         if (last)
 587                 nf_ct_put(last);
 588
 589         return skb->len;
 590 }
 591
 592 static inline int
 593 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 594 {
 595         struct nlattr *tb[CTA_IP_MAX+1];
 596         struct nf_conntrack_l3proto *l3proto;
 597         int ret = 0;
 598
 599         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 600
 601         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 602
 603         if (likely(l3proto->nlattr_to_tuple)) {
 604                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 605                                           l3proto->nla_policy);
 606                 if (ret == 0)
 607                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 608         }
 609
 610         nf_ct_l3proto_put(l3proto);
 611
 612         return ret;
 613 }
 614
 615 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 616         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 617 };
 618
 619 static inline int
 620 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 621                             struct nf_conntrack_tuple *tuple)
 622 {
 623         struct nlattr *tb[CTA_PROTO_MAX+1];
 624         struct nf_conntrack_l4proto *l4proto;
 625         int ret = 0;
 626
 627         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 628         if (ret < 0)
 629                 return ret;
 630
 631         if (!tb[CTA_PROTO_NUM])
 632                 return -EINVAL;
 633         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 634
 635         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 636
 637         if (likely(l4proto->nlattr_to_tuple)) {
 638                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 639                                           l4proto->nla_policy);
 640                 if (ret == 0)
 641                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 642         }
 643
 644         nf_ct_l4proto_put(l4proto);
 645
 646         return ret;
 647 }
 648
 649 static int
 650 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 651                       enum ctattr_tuple type, u_int8_t l3num)
 652 {
 653         struct nlattr *tb[CTA_TUPLE_MAX+1];
 654         int err;
 655
 656         memset(tuple, 0, sizeof(*tuple));
 657
 658         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 659
 660         if (!tb[CTA_TUPLE_IP])
 661                 return -EINVAL;
 662
 663         tuple->src.l3num = l3num;
 664
 665         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 666         if (err < 0)
 667                 return err;
 668
 669         if (!tb[CTA_TUPLE_PROTO])
 670                 return -EINVAL;
 671
 672         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 673         if (err < 0)
 674                 return err;
 675
 676         /* orig and expect tuples get DIR_ORIGINAL */
 677         if (type == CTA_TUPLE_REPLY)
 678                 tuple->dst.dir = IP_CT_DIR_REPLY;
 679         else
 680                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 681
 682         return 0;
 683 }
 684
 685 static inline int
 686 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 687 {
 688         struct nlattr *tb[CTA_HELP_MAX+1];
 689
 690         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 691
 692         if (!tb[CTA_HELP_NAME])
 693                 return -EINVAL;
 694
 695         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 696
 697         return 0;
 698 }
 699
 700 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 701         [CTA_STATUS]            = { .type = NLA_U32 },
 702         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 703         [CTA_MARK]              = { .type = NLA_U32 },
 704         [CTA_USE]               = { .type = NLA_U32 },
 705         [CTA_ID]                = { .type = NLA_U32 },
 706 };
 707
 708 static int
 709 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 710                         struct nlmsghdr *nlh, struct nlattr *cda[])
 711 {
 712         struct nf_conntrack_tuple_hash *h;
 713         struct nf_conntrack_tuple tuple;
 714         struct nf_conn *ct;
 715         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 716         u_int8_t u3 = nfmsg->nfgen_family;
 717         int err = 0;
 718
 719         if (cda[CTA_TUPLE_ORIG])
 720                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 721         else if (cda[CTA_TUPLE_REPLY])
 722                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 723         else {
 724                 /* Flush the whole table */
 725                 nf_conntrack_flush(&init_net);
 726                 return 0;
 727         }
 728
 729         if (err < 0)
 730                 return err;
 731
 732         h = nf_conntrack_find_get(&init_net, &tuple);
 733         if (!h)
 734                 return -ENOENT;
 735
 736         ct = nf_ct_tuplehash_to_ctrack(h);
 737
 738         if (cda[CTA_ID]) {
 739                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 740                 if (id != (u32)(unsigned long)ct) {
 741                         nf_ct_put(ct);
 742                         return -ENOENT;
 743                 }
 744         }
 745
 746         nf_ct_kill(ct);
 747         nf_ct_put(ct);
 748
 749         return 0;
 750 }
 751
 752 static int
 753 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 754                         struct nlmsghdr *nlh, struct nlattr *cda[])
 755 {
 756         struct nf_conntrack_tuple_hash *h;
 757         struct nf_conntrack_tuple tuple;
 758         struct nf_conn *ct;
 759         struct sk_buff *skb2 = NULL;
 760         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 761         u_int8_t u3 = nfmsg->nfgen_family;
 762         int err = 0;
 763
 764         if (nlh->nlmsg_flags & NLM_F_DUMP)
 765                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 766                                           ctnetlink_done);
 767
 768         if (cda[CTA_TUPLE_ORIG])
 769                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 770         else if (cda[CTA_TUPLE_REPLY])
 771                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 772         else
 773                 return -EINVAL;
 774
 775         if (err < 0)
 776                 return err;
 777
 778         h = nf_conntrack_find_get(&init_net, &tuple);
 779         if (!h)
 780                 return -ENOENT;
 781
 782         ct = nf_ct_tuplehash_to_ctrack(h);
 783
 784         err = -ENOMEM;
 785         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 786         if (!skb2) {
 787                 nf_ct_put(ct);
 788                 return -ENOMEM;
 789         }
 790
 791         rcu_read_lock();
 792         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 793                                   IPCTNL_MSG_CT_NEW, 1, ct);
 794         rcu_read_unlock();
 795         nf_ct_put(ct);
 796         if (err <= 0)
 797                 goto free;
 798
 799         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 800         if (err < 0)
 801                 goto out;
 802
 803         return 0;
 804
 805 free:
 806         kfree_skb(skb2);
 807 out:
 808         return err;
 809 }
 810
 811 #ifdef CONFIG_NF_NAT_NEEDED
 812 static int
 813 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 814                           enum nf_nat_manip_type manip,
 815                           struct nlattr *attr)
 816 {
 817         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 818
 819         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 820         if (!parse_nat_setup) {
 821 #ifdef CONFIG_MODULES
 822                 rcu_read_unlock();
 823                 nfnl_unlock();
 824                 if (request_module("nf-nat-ipv4") < 0) {
 825                         nfnl_lock();
 826                         rcu_read_lock();
 827                         return -EOPNOTSUPP;
 828                 }
 829                 nfnl_lock();
 830                 rcu_read_lock();
 831                 if (nfnetlink_parse_nat_setup_hook)
 832                         return -EAGAIN;
 833 #endif
 834                 return -EOPNOTSUPP;
 835         }
 836
 837         return parse_nat_setup(ct, manip, attr);
 838 }
 839 #endif
 840
 841 static int
 842 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 843 {
 844         unsigned long d;
 845         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 846         d = ct->status ^ status;
 847
 848         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 849                 /* unchangeable */
 850                 return -EBUSY;
 851
 852         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 853                 /* SEEN_REPLY bit can only be set */
 854                 return -EBUSY;
 855
 856         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 857                 /* ASSURED bit can only be set */
 858                 return -EBUSY;
 859
 860         /* Be careful here, modifying NAT bits can screw up things,
 861          * so don't let users modify them directly if they don't pass
 862          * nf_nat_range. */
 863         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 864         return 0;
 865 }
 866
 867 static int
 868 ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 869 {
 870 #ifdef CONFIG_NF_NAT_NEEDED
 871         int ret;
 872
 873         if (cda[CTA_NAT_DST]) {
 874                 ret = ctnetlink_parse_nat_setup(ct,
 875                                                 IP_NAT_MANIP_DST,
 876                                                 cda[CTA_NAT_DST]);
 877                 if (ret < 0)
 878                         return ret;
 879         }
 880         if (cda[CTA_NAT_SRC]) {
 881                 ret = ctnetlink_parse_nat_setup(ct,
 882                                                 IP_NAT_MANIP_SRC,
 883                                                 cda[CTA_NAT_SRC]);
 884                 if (ret < 0)
 885                         return ret;
 886         }
 887         return 0;
 888 #else
 889         return -EOPNOTSUPP;
 890 #endif
 891 }
 892
 893 static inline int
 894 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 895 {
 896         struct nf_conntrack_helper *helper;
 897         struct nf_conn_help *help = nfct_help(ct);
 898         char *helpname;
 899         int err;
 900
 901         /* don't change helper of sibling connections */
 902         if (ct->master)
 903                 return -EBUSY;
 904
 905         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 906         if (err < 0)
 907                 return err;
 908
 909         if (!strcmp(helpname, "")) {
 910                 if (help && help->helper) {
 911                         /* we had a helper before ... */
 912                         nf_ct_remove_expectations(ct);
 913                         rcu_assign_pointer(help->helper, NULL);
 914                 }
 915
 916                 return 0;
 917         }
 918
 919         helper = __nf_conntrack_helper_find_byname(helpname);
 920         if (helper == NULL)
 921                 return -EOPNOTSUPP;
 922
 923         if (help) {
 924                 if (help->helper == helper)
 925                         return 0;
 926                 if (help->helper)
 927                         return -EBUSY;
 928                 /* need to zero data of old helper */
 929                 memset(&help->help, 0, sizeof(help->help));
 930         } else {
 931                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
 932                 if (help == NULL)
 933                         return -ENOMEM;
 934         }
 935
 936         rcu_assign_pointer(help->helper, helper);
 937
 938         return 0;
 939 }
 940
 941 static inline int
 942 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 943 {
 944         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 945
 946         if (!del_timer(&ct->timeout))
 947                 return -ETIME;
 948
 949         ct->timeout.expires = jiffies + timeout * HZ;
 950         add_timer(&ct->timeout);
 951
 952         return 0;
 953 }
 954
 955 static inline int
 956 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 957 {
 958         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
 959         struct nf_conntrack_l4proto *l4proto;
 960         int err = 0;
 961
 962         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 963
 964         l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
 965         if (l4proto->from_nlattr)
 966                 err = l4proto->from_nlattr(tb, ct);
 967         nf_ct_l4proto_put(l4proto);
 968
 969         return err;
 970 }
 971
 972 #ifdef CONFIG_NF_NAT_NEEDED
 973 static inline int
 974 change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
 975 {
 976         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
 977
 978         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
 979
 980         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
 981                 return -EINVAL;
 982
 983         natseq->correction_pos =
 984                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
 985
 986         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
 987                 return -EINVAL;
 988
 989         natseq->offset_before =
 990                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
 991
 992         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
 993                 return -EINVAL;
 994
 995         natseq->offset_after =
 996                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
 997
 998         return 0;
 999 }
1000
1001 static int
1002 ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1003 {
1004         int ret = 0;
1005         struct nf_conn_nat *nat = nfct_nat(ct);
1006
1007         if (!nat)
1008                 return 0;
1009
1010         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1011                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1012                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1013                 if (ret < 0)
1014                         return ret;
1015
1016                 ct->status |= IPS_SEQ_ADJUST;
1017         }
1018
1019         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1020                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1021                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1022                 if (ret < 0)
1023                         return ret;
1024
1025                 ct->status |= IPS_SEQ_ADJUST;
1026         }
1027
1028         return 0;
1029 }
1030 #endif
1031
1032 static int
1033 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1034 {
1035         int err;
1036
1037         if (cda[CTA_HELP]) {
1038                 err = ctnetlink_change_helper(ct, cda);
1039                 if (err < 0)
1040                         return err;
1041         }
1042
1043         if (cda[CTA_TIMEOUT]) {
1044                 err = ctnetlink_change_timeout(ct, cda);
1045                 if (err < 0)
1046                         return err;
1047         }
1048
1049         if (cda[CTA_STATUS]) {
1050                 err = ctnetlink_change_status(ct, cda);
1051                 if (err < 0)
1052                         return err;
1053         }
1054
1055         if (cda[CTA_PROTOINFO]) {
1056                 err = ctnetlink_change_protoinfo(ct, cda);
1057                 if (err < 0)
1058                         return err;
1059         }
1060
1061 #if defined(CONFIG_NF_CONNTRACK_MARK)
1062         if (cda[CTA_MARK])
1063                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1064 #endif
1065
1066 #ifdef CONFIG_NF_NAT_NEEDED
1067         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1068                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1069                 if (err < 0)
1070                         return err;
1071         }
1072 #endif
1073
1074         return 0;
1075 }
1076
1077 static int
1078 ctnetlink_create_conntrack(struct nlattr *cda[],
1079                            struct nf_conntrack_tuple *otuple,
1080                            struct nf_conntrack_tuple *rtuple,
1081                            struct nf_conn *master_ct)
1082 {
1083         struct nf_conn *ct;
1084         int err = -EINVAL;
1085         struct nf_conn_help *help;
1086         struct nf_conntrack_helper *helper;
1087
1088         ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_KERNEL);
1089         if (ct == NULL || IS_ERR(ct))
1090                 return -ENOMEM;
1091
1092         if (!cda[CTA_TIMEOUT])
1093                 goto err;
1094         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1095
1096         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1097         ct->status |= IPS_CONFIRMED;
1098
1099         rcu_read_lock();
1100         helper = __nf_ct_helper_find(rtuple);
1101         if (helper) {
1102                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1103                 if (help == NULL) {
1104                         rcu_read_unlock();
1105                         err = -ENOMEM;
1106                         goto err;
1107                 }
1108                 /* not in hash table yet so not strictly necessary */
1109                 rcu_assign_pointer(help->helper, helper);
1110         }
1111
1112         if (cda[CTA_STATUS]) {
1113                 err = ctnetlink_change_status(ct, cda);
1114                 if (err < 0) {
1115                         rcu_read_unlock();
1116                         goto err;
1117                 }
1118         }
1119
1120         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1121                 err = ctnetlink_change_nat(ct, cda);
1122                 if (err < 0) {
1123                         rcu_read_unlock();
1124                         goto err;
1125                 }
1126         }
1127
1128         if (cda[CTA_PROTOINFO]) {
1129                 err = ctnetlink_change_protoinfo(ct, cda);
1130                 if (err < 0) {
1131                         rcu_read_unlock();
1132                         goto err;
1133                 }
1134         }
1135
1136         nf_ct_acct_ext_add(ct, GFP_KERNEL);
1137
1138 #if defined(CONFIG_NF_CONNTRACK_MARK)
1139         if (cda[CTA_MARK])
1140                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1141 #endif
1142
1143         /* setup master conntrack: this is a confirmed expectation */
1144         if (master_ct) {
1145                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1146                 ct->master = master_ct;
1147         }
1148
1149         add_timer(&ct->timeout);
1150         nf_conntrack_hash_insert(ct);
1151         rcu_read_unlock();
1152
1153         return 0;
1154
1155 err:
1156         nf_conntrack_free(ct);
1157         return err;
1158 }
1159
1160 static int
1161 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1162                         struct nlmsghdr *nlh, struct nlattr *cda[])
1163 {
1164         struct nf_conntrack_tuple otuple, rtuple;
1165         struct nf_conntrack_tuple_hash *h = NULL;
1166         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1167         u_int8_t u3 = nfmsg->nfgen_family;
1168         int err = 0;
1169
1170         if (cda[CTA_TUPLE_ORIG]) {
1171                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1172                 if (err < 0)
1173                         return err;
1174         }
1175
1176         if (cda[CTA_TUPLE_REPLY]) {
1177                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1178                 if (err < 0)
1179                         return err;
1180         }
1181
1182         spin_lock_bh(&nf_conntrack_lock);
1183         if (cda[CTA_TUPLE_ORIG])
1184                 h = __nf_conntrack_find(&init_net, &otuple);
1185         else if (cda[CTA_TUPLE_REPLY])
1186                 h = __nf_conntrack_find(&init_net, &rtuple);
1187
1188         if (h == NULL) {
1189                 struct nf_conntrack_tuple master;
1190                 struct nf_conntrack_tuple_hash *master_h = NULL;
1191                 struct nf_conn *master_ct = NULL;
1192
1193                 if (cda[CTA_TUPLE_MASTER]) {
1194                         err = ctnetlink_parse_tuple(cda,
1195                                                     &master,
1196                                                     CTA_TUPLE_MASTER,
1197                                                     u3);
1198                         if (err < 0)
1199                                 goto out_unlock;
1200
1201                         master_h = __nf_conntrack_find(&init_net, &master);
1202                         if (master_h == NULL) {
1203                                 err = -ENOENT;
1204                                 goto out_unlock;
1205                         }
1206                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1207                         nf_conntrack_get(&master_ct->ct_general);
1208                 }
1209
1210                 spin_unlock_bh(&nf_conntrack_lock);
1211                 err = -ENOENT;
1212                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1213                         err = ctnetlink_create_conntrack(cda,
1214                                                          &otuple,
1215                                                          &rtuple,
1216                                                          master_ct);
1217                 if (err < 0 && master_ct)
1218                         nf_ct_put(master_ct);
1219
1220                 return err;
1221         }
1222         /* implicit 'else' */
1223
1224         /* We manipulate the conntrack inside the global conntrack table lock,
1225          * so there's no need to increase the refcount */
1226         err = -EEXIST;
1227         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1228                 /* we only allow nat config for new conntracks */
1229                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1230                         err = -EOPNOTSUPP;
1231                         goto out_unlock;
1232                 }
1233                 /* can't link an existing conntrack to a master */
1234                 if (cda[CTA_TUPLE_MASTER]) {
1235                         err = -EOPNOTSUPP;
1236                         goto out_unlock;
1237                 }
1238                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1239                                                  cda);
1240         }
1241
1242 out_unlock:
1243         spin_unlock_bh(&nf_conntrack_lock);
1244         return err;
1245 }
1246
1247 /***********************************************************************
1248  * EXPECT
1249  ***********************************************************************/
1250
1251 static inline int
1252 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1253                          const struct nf_conntrack_tuple *tuple,
1254                          enum ctattr_expect type)
1255 {
1256         struct nlattr *nest_parms;
1257
1258         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1259         if (!nest_parms)
1260                 goto nla_put_failure;
1261         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1262                 goto nla_put_failure;
1263         nla_nest_end(skb, nest_parms);
1264
1265         return 0;
1266
1267 nla_put_failure:
1268         return -1;
1269 }
1270
1271 static inline int
1272 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1273                         const struct nf_conntrack_tuple *tuple,
1274                         const struct nf_conntrack_tuple_mask *mask)
1275 {
1276         int ret;
1277         struct nf_conntrack_l3proto *l3proto;
1278         struct nf_conntrack_l4proto *l4proto;
1279         struct nf_conntrack_tuple m;
1280         struct nlattr *nest_parms;
1281
1282         memset(&m, 0xFF, sizeof(m));
1283         m.src.u.all = mask->src.u.all;
1284         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1285
1286         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1287         if (!nest_parms)
1288                 goto nla_put_failure;
1289
1290         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1291         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1292
1293         if (unlikely(ret < 0))
1294                 goto nla_put_failure;
1295
1296         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1297         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1298         if (unlikely(ret < 0))
1299                 goto nla_put_failure;
1300
1301         nla_nest_end(skb, nest_parms);
1302
1303         return 0;
1304
1305 nla_put_failure:
1306         return -1;
1307 }
1308
1309 static int
1310 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1311                           const struct nf_conntrack_expect *exp)
1312 {
1313         struct nf_conn *master = exp->master;
1314         long timeout = (exp->timeout.expires - jiffies) / HZ;
1315
1316         if (timeout < 0)
1317                 timeout = 0;
1318
1319         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1320                 goto nla_put_failure;
1321         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1322                 goto nla_put_failure;
1323         if (ctnetlink_exp_dump_tuple(skb,
1324                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1325                                  CTA_EXPECT_MASTER) < 0)
1326                 goto nla_put_failure;
1327
1328         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1329         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1330
1331         return 0;
1332
1333 nla_put_failure:
1334         return -1;
1335 }
1336
1337 static int
1338 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1339                     int event,
1340                     int nowait,
1341                     const struct nf_conntrack_expect *exp)
1342 {
1343         struct nlmsghdr *nlh;
1344         struct nfgenmsg *nfmsg;
1345         unsigned char *b = skb_tail_pointer(skb);
1346
1347         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1348         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1349         nfmsg  = NLMSG_DATA(nlh);
1350
1351         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1352         nfmsg->nfgen_family = exp->tuple.src.l3num;
1353         nfmsg->version      = NFNETLINK_V0;
1354         nfmsg->res_id       = 0;
1355
1356         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1357                 goto nla_put_failure;
1358
1359         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1360         return skb->len;
1361
1362 nlmsg_failure:
1363 nla_put_failure:
1364         nlmsg_trim(skb, b);
1365         return -1;
1366 }
1367
1368 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1369 static int ctnetlink_expect_event(struct notifier_block *this,
1370                                   unsigned long events, void *ptr)
1371 {
1372         struct nlmsghdr *nlh;
1373         struct nfgenmsg *nfmsg;
1374         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1375         struct sk_buff *skb;
1376         unsigned int type;
1377         sk_buff_data_t b;
1378         int flags = 0;
1379
1380         if (events & IPEXP_NEW) {
1381                 type = IPCTNL_MSG_EXP_NEW;
1382                 flags = NLM_F_CREATE|NLM_F_EXCL;
1383         } else
1384                 return NOTIFY_DONE;
1385
1386         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1387                 return NOTIFY_DONE;
1388
1389         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1390         if (!skb)
1391                 return NOTIFY_DONE;
1392
1393         b = skb->tail;
1394
1395         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1396         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1397         nfmsg = NLMSG_DATA(nlh);
1398
1399         nlh->nlmsg_flags    = flags;
1400         nfmsg->nfgen_family = exp->tuple.src.l3num;
1401         nfmsg->version      = NFNETLINK_V0;
1402         nfmsg->res_id       = 0;
1403
1404         rcu_read_lock();
1405         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1406                 goto nla_put_failure;
1407         rcu_read_unlock();
1408
1409         nlh->nlmsg_len = skb->tail - b;
1410         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1411         return NOTIFY_DONE;
1412
1413 nla_put_failure:
1414         rcu_read_unlock();
1415 nlmsg_failure:
1416         kfree_skb(skb);
1417         return NOTIFY_DONE;
1418 }
1419 #endif
1420 static int ctnetlink_exp_done(struct netlink_callback *cb)
1421 {
1422         if (cb->args[1])
1423                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1424         return 0;
1425 }
1426
1427 static int
1428 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1429 {
1430         struct net *net = &init_net;
1431         struct nf_conntrack_expect *exp, *last;
1432         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1433         struct hlist_node *n;
1434         u_int8_t l3proto = nfmsg->nfgen_family;
1435
1436         rcu_read_lock();
1437         last = (struct nf_conntrack_expect *)cb->args[1];
1438         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1439 restart:
1440                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1441                                      hnode) {
1442                         if (l3proto && exp->tuple.src.l3num != l3proto)
1443                                 continue;
1444                         if (cb->args[1]) {
1445                                 if (exp != last)
1446                                         continue;
1447                                 cb->args[1] = 0;
1448                         }
1449                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1450                                                     cb->nlh->nlmsg_seq,
1451                                                     IPCTNL_MSG_EXP_NEW,
1452                                                     1, exp) < 0) {
1453                                 if (!atomic_inc_not_zero(&exp->use))
1454                                         continue;
1455                                 cb->args[1] = (unsigned long)exp;
1456                                 goto out;
1457                         }
1458                 }
1459                 if (cb->args[1]) {
1460                         cb->args[1] = 0;
1461                         goto restart;
1462                 }
1463         }
1464 out:
1465         rcu_read_unlock();
1466         if (last)
1467                 nf_ct_expect_put(last);
1468
1469         return skb->len;
1470 }
1471
1472 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1473         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1474         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1475 };
1476
1477 static int
1478 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1479                      struct nlmsghdr *nlh, struct nlattr *cda[])
1480 {
1481         struct nf_conntrack_tuple tuple;
1482         struct nf_conntrack_expect *exp;
1483         struct sk_buff *skb2;
1484         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1485         u_int8_t u3 = nfmsg->nfgen_family;
1486         int err = 0;
1487
1488         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1489                 return netlink_dump_start(ctnl, skb, nlh,
1490                                           ctnetlink_exp_dump_table,
1491                                           ctnetlink_exp_done);
1492         }
1493
1494         if (cda[CTA_EXPECT_MASTER])
1495                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1496         else
1497                 return -EINVAL;
1498
1499         if (err < 0)
1500                 return err;
1501
1502         exp = nf_ct_expect_find_get(&init_net, &tuple);
1503         if (!exp)
1504                 return -ENOENT;
1505
1506         if (cda[CTA_EXPECT_ID]) {
1507                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1508                 if (ntohl(id) != (u32)(unsigned long)exp) {
1509                         nf_ct_expect_put(exp);
1510                         return -ENOENT;
1511                 }
1512         }
1513
1514         err = -ENOMEM;
1515         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1516         if (!skb2)
1517                 goto out;
1518
1519         rcu_read_lock();
1520         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1521                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1522                                       1, exp);
1523         rcu_read_unlock();
1524         if (err <= 0)
1525                 goto free;
1526
1527         nf_ct_expect_put(exp);
1528
1529         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1530
1531 free:
1532         kfree_skb(skb2);
1533 out:
1534         nf_ct_expect_put(exp);
1535         return err;
1536 }
1537
1538 static int
1539 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1540                      struct nlmsghdr *nlh, struct nlattr *cda[])
1541 {
1542         struct nf_conntrack_expect *exp;
1543         struct nf_conntrack_tuple tuple;
1544         struct nf_conntrack_helper *h;
1545         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1546         struct hlist_node *n, *next;
1547         u_int8_t u3 = nfmsg->nfgen_family;
1548         unsigned int i;
1549         int err;
1550
1551         if (cda[CTA_EXPECT_TUPLE]) {
1552                 /* delete a single expect by tuple */
1553                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1554                 if (err < 0)
1555                         return err;
1556
1557                 /* bump usage count to 2 */
1558                 exp = nf_ct_expect_find_get(&init_net, &tuple);
1559                 if (!exp)
1560                         return -ENOENT;
1561
1562                 if (cda[CTA_EXPECT_ID]) {
1563                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1564                         if (ntohl(id) != (u32)(unsigned long)exp) {
1565                                 nf_ct_expect_put(exp);
1566                                 return -ENOENT;
1567                         }
1568                 }
1569
1570                 /* after list removal, usage count == 1 */
1571                 nf_ct_unexpect_related(exp);
1572                 /* have to put what we 'get' above.
1573                  * after this line usage count == 0 */
1574                 nf_ct_expect_put(exp);
1575         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1576                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1577                 struct nf_conn_help *m_help;
1578
1579                 /* delete all expectations for this helper */
1580                 spin_lock_bh(&nf_conntrack_lock);
1581                 h = __nf_conntrack_helper_find_byname(name);
1582                 if (!h) {
1583                         spin_unlock_bh(&nf_conntrack_lock);
1584                         return -EOPNOTSUPP;
1585                 }
1586                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1587                         hlist_for_each_entry_safe(exp, n, next,
1588                                                   &init_net.ct.expect_hash[i],
1589                                                   hnode) {
1590                                 m_help = nfct_help(exp->master);
1591                                 if (m_help->helper == h
1592                                     && del_timer(&exp->timeout)) {
1593                                         nf_ct_unlink_expect(exp);
1594                                         nf_ct_expect_put(exp);
1595                                 }
1596                         }
1597                 }
1598                 spin_unlock_bh(&nf_conntrack_lock);
1599         } else {
1600                 /* This basically means we have to flush everything*/
1601                 spin_lock_bh(&nf_conntrack_lock);
1602                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1603                         hlist_for_each_entry_safe(exp, n, next,
1604                                                   &init_net.ct.expect_hash[i],
1605                                                   hnode) {
1606                                 if (del_timer(&exp->timeout)) {
1607                                         nf_ct_unlink_expect(exp);
1608                                         nf_ct_expect_put(exp);
1609                                 }
1610                         }
1611                 }
1612                 spin_unlock_bh(&nf_conntrack_lock);
1613         }
1614
1615         return 0;
1616 }
1617 static int
1618 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1619 {
1620         return -EOPNOTSUPP;
1621 }
1622
1623 static int
1624 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1625 {
1626         struct nf_conntrack_tuple tuple, mask, master_tuple;
1627         struct nf_conntrack_tuple_hash *h = NULL;
1628         struct nf_conntrack_expect *exp;
1629         struct nf_conn *ct;
1630         struct nf_conn_help *help;
1631         int err = 0;
1632
1633         /* caller guarantees that those three CTA_EXPECT_* exist */
1634         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1635         if (err < 0)
1636                 return err;
1637         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1638         if (err < 0)
1639                 return err;
1640         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1641         if (err < 0)
1642                 return err;
1643
1644         /* Look for master conntrack of this expectation */
1645         h = nf_conntrack_find_get(&init_net, &master_tuple);
1646         if (!h)
1647                 return -ENOENT;
1648         ct = nf_ct_tuplehash_to_ctrack(h);
1649         help = nfct_help(ct);
1650
1651         if (!help || !help->helper) {
1652                 /* such conntrack hasn't got any helper, abort */
1653                 err = -EOPNOTSUPP;
1654                 goto out;
1655         }
1656
1657         exp = nf_ct_expect_alloc(ct);
1658         if (!exp) {
1659                 err = -ENOMEM;
1660                 goto out;
1661         }
1662
1663         exp->expectfn = NULL;
1664         exp->flags = 0;
1665         exp->master = ct;
1666         exp->helper = NULL;
1667         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1668         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1669         exp->mask.src.u.all = mask.src.u.all;
1670
1671         err = nf_ct_expect_related(exp);
1672         nf_ct_expect_put(exp);
1673
1674 out:
1675         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1676         return err;
1677 }
1678
1679 static int
1680 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1681                      struct nlmsghdr *nlh, struct nlattr *cda[])
1682 {
1683         struct nf_conntrack_tuple tuple;
1684         struct nf_conntrack_expect *exp;
1685         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1686         u_int8_t u3 = nfmsg->nfgen_family;
1687         int err = 0;
1688
1689         if (!cda[CTA_EXPECT_TUPLE]
1690             || !cda[CTA_EXPECT_MASK]
1691             || !cda[CTA_EXPECT_MASTER])
1692                 return -EINVAL;
1693
1694         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1695         if (err < 0)
1696                 return err;
1697
1698         spin_lock_bh(&nf_conntrack_lock);
1699         exp = __nf_ct_expect_find(&init_net, &tuple);
1700
1701         if (!exp) {
1702                 spin_unlock_bh(&nf_conntrack_lock);
1703                 err = -ENOENT;
1704                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1705                         err = ctnetlink_create_expect(cda, u3);
1706                 return err;
1707         }
1708
1709         err = -EEXIST;
1710         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1711                 err = ctnetlink_change_expect(exp, cda);
1712         spin_unlock_bh(&nf_conntrack_lock);
1713
1714         return err;
1715 }
1716
1717 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1718 static struct notifier_block ctnl_notifier = {
1719         .notifier_call  = ctnetlink_conntrack_event,
1720 };
1721
1722 static struct notifier_block ctnl_notifier_exp = {
1723         .notifier_call  = ctnetlink_expect_event,
1724 };
1725 #endif
1726
1727 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1728         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1729                                             .attr_count = CTA_MAX,
1730                                             .policy = ct_nla_policy },
1731         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1732                                             .attr_count = CTA_MAX,
1733                                             .policy = ct_nla_policy },
1734         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1735                                             .attr_count = CTA_MAX,
1736                                             .policy = ct_nla_policy },
1737         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1738                                             .attr_count = CTA_MAX,
1739                                             .policy = ct_nla_policy },
1740 };
1741
1742 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1743         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1744                                             .attr_count = CTA_EXPECT_MAX,
1745                                             .policy = exp_nla_policy },
1746         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1747                                             .attr_count = CTA_EXPECT_MAX,
1748                                             .policy = exp_nla_policy },
1749         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1750                                             .attr_count = CTA_EXPECT_MAX,
1751                                             .policy = exp_nla_policy },
1752 };
1753
1754 static const struct nfnetlink_subsystem ctnl_subsys = {
1755         .name                           = "conntrack",
1756         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1757         .cb_count                       = IPCTNL_MSG_MAX,
1758         .cb                             = ctnl_cb,
1759 };
1760
1761 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1762         .name                           = "conntrack_expect",
1763         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1764         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1765         .cb                             = ctnl_exp_cb,
1766 };
1767
1768 MODULE_ALIAS("ip_conntrack_netlink");
1769 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1770 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1771
1772 static int __init ctnetlink_init(void)
1773 {
1774         int ret;
1775
1776         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1777         ret = nfnetlink_subsys_register(&ctnl_subsys);
1778         if (ret < 0) {
1779                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1780                 goto err_out;
1781         }
1782
1783         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1784         if (ret < 0) {
1785                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1786                 goto err_unreg_subsys;
1787         }
1788
1789 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1790         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1791         if (ret < 0) {
1792                 printk("ctnetlink_init: cannot register notifier.\n");
1793                 goto err_unreg_exp_subsys;
1794         }
1795
1796         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1797         if (ret < 0) {
1798                 printk("ctnetlink_init: cannot expect register notifier.\n");
1799                 goto err_unreg_notifier;
1800         }
1801 #endif
1802
1803         return 0;
1804
1805 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1806 err_unreg_notifier:
1807         nf_conntrack_unregister_notifier(&ctnl_notifier);
1808 err_unreg_exp_subsys:
1809         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1810 #endif
1811 err_unreg_subsys:
1812         nfnetlink_subsys_unregister(&ctnl_subsys);
1813 err_out:
1814         return ret;
1815 }
1816
1817 static void __exit ctnetlink_exit(void)
1818 {
1819         printk("ctnetlink: unregistering from nfnetlink.\n");
1820
1821 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1822         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1823         nf_conntrack_unregister_notifier(&ctnl_notifier);
1824 #endif
1825
1826         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1827         nfnetlink_subsys_unregister(&ctnl_subsys);
1828         return;
1829 }
1830
1831 module_init(ctnetlink_init);
1832 module_exit(ctnetlink_exit);