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/slab.h>
  31
  32 #include <linux/netfilter.h>
  33 #include <net/netlink.h>
  34 #include <net/sock.h>
  35 #include <net/netfilter/nf_conntrack.h>
  36 #include <net/netfilter/nf_conntrack_core.h>
  37 #include <net/netfilter/nf_conntrack_expect.h>
  38 #include <net/netfilter/nf_conntrack_helper.h>
  39 #include <net/netfilter/nf_conntrack_l3proto.h>
  40 #include <net/netfilter/nf_conntrack_l4proto.h>
  41 #include <net/netfilter/nf_conntrack_tuple.h>
  42 #include <net/netfilter/nf_conntrack_acct.h>
  43 #include <net/netfilter/nf_conntrack_zones.h>
  44 #ifdef CONFIG_NF_NAT_NEEDED
  45 #include <net/netfilter/nf_nat_core.h>
  46 #include <net/netfilter/nf_nat_protocol.h>
  47 #endif
  48
  49 #include <linux/netfilter/nfnetlink.h>
  50 #include <linux/netfilter/nfnetlink_conntrack.h>
  51
  52 MODULE_LICENSE("GPL");
  53
  54 static char __initdata version[] = "0.93";
  55
  56 static inline int
  57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  58                             const struct nf_conntrack_tuple *tuple,
  59                             struct nf_conntrack_l4proto *l4proto)
  60 {
  61         int ret = 0;
  62         struct nlattr *nest_parms;
  63
  64         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  65         if (!nest_parms)
  66                 goto nla_put_failure;
  67         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  68
  69         if (likely(l4proto->tuple_to_nlattr))
  70                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  71
  72         nla_nest_end(skb, nest_parms);
  73
  74         return ret;
  75
  76 nla_put_failure:
  77         return -1;
  78 }
  79
  80 static inline int
  81 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  82                          const struct nf_conntrack_tuple *tuple,
  83                          struct nf_conntrack_l3proto *l3proto)
  84 {
  85         int ret = 0;
  86         struct nlattr *nest_parms;
  87
  88         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  89         if (!nest_parms)
  90                 goto nla_put_failure;
  91
  92         if (likely(l3proto->tuple_to_nlattr))
  93                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  94
  95         nla_nest_end(skb, nest_parms);
  96
  97         return ret;
  98
  99 nla_put_failure:
 100         return -1;
 101 }
 102
 103 static int
 104 ctnetlink_dump_tuples(struct sk_buff *skb,
 105                       const struct nf_conntrack_tuple *tuple)
 106 {
 107         int ret;
 108         struct nf_conntrack_l3proto *l3proto;
 109         struct nf_conntrack_l4proto *l4proto;
 110
 111         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 112         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 113
 114         if (unlikely(ret < 0))
 115                 return ret;
 116
 117         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 118         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 119
 120         return ret;
 121 }
 122
 123 static inline int
 124 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 125 {
 126         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 127         return 0;
 128
 129 nla_put_failure:
 130         return -1;
 131 }
 132
 133 static inline int
 134 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 135 {
 136         long timeout = (ct->timeout.expires - jiffies) / HZ;
 137
 138         if (timeout < 0)
 139                 timeout = 0;
 140
 141         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 142         return 0;
 143
 144 nla_put_failure:
 145         return -1;
 146 }
 147
 148 static inline int
 149 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 150 {
 151         struct nf_conntrack_l4proto *l4proto;
 152         struct nlattr *nest_proto;
 153         int ret;
 154
 155         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 156         if (!l4proto->to_nlattr)
 157                 return 0;
 158
 159         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 160         if (!nest_proto)
 161                 goto nla_put_failure;
 162
 163         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 164
 165         nla_nest_end(skb, nest_proto);
 166
 167         return ret;
 168
 169 nla_put_failure:
 170         return -1;
 171 }
 172
 173 static inline int
 174 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 175 {
 176         struct nlattr *nest_helper;
 177         const struct nf_conn_help *help = nfct_help(ct);
 178         struct nf_conntrack_helper *helper;
 179
 180         if (!help)
 181                 return 0;
 182
 183         helper = rcu_dereference(help->helper);
 184         if (!helper)
 185                 goto out;
 186
 187         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 188         if (!nest_helper)
 189                 goto nla_put_failure;
 190         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 191
 192         if (helper->to_nlattr)
 193                 helper->to_nlattr(skb, ct);
 194
 195         nla_nest_end(skb, nest_helper);
 196 out:
 197         return 0;
 198
 199 nla_put_failure:
 200         return -1;
 201 }
 202
 203 static int
 204 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 205                         enum ip_conntrack_dir dir)
 206 {
 207         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 208         struct nlattr *nest_count;
 209         const struct nf_conn_counter *acct;
 210
 211         acct = nf_conn_acct_find(ct);
 212         if (!acct)
 213                 return 0;
 214
 215         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 216         if (!nest_count)
 217                 goto nla_put_failure;
 218
 219         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 220                      cpu_to_be64(acct[dir].packets));
 221         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 222                      cpu_to_be64(acct[dir].bytes));
 223
 224         nla_nest_end(skb, nest_count);
 225
 226         return 0;
 227
 228 nla_put_failure:
 229         return -1;
 230 }
 231
 232 #ifdef CONFIG_NF_CONNTRACK_MARK
 233 static inline int
 234 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 235 {
 236         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 237         return 0;
 238
 239 nla_put_failure:
 240         return -1;
 241 }
 242 #else
 243 #define ctnetlink_dump_mark(a, b) (0)
 244 #endif
 245
 246 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 247 static inline int
 248 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 249 {
 250         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 251         return 0;
 252
 253 nla_put_failure:
 254         return -1;
 255 }
 256 #else
 257 #define ctnetlink_dump_secmark(a, b) (0)
 258 #endif
 259
 260 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 261
 262 static inline int
 263 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 264 {
 265         struct nlattr *nest_parms;
 266
 267         if (!(ct->status & IPS_EXPECTED))
 268                 return 0;
 269
 270         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 271         if (!nest_parms)
 272                 goto nla_put_failure;
 273         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 274                 goto nla_put_failure;
 275         nla_nest_end(skb, nest_parms);
 276
 277         return 0;
 278
 279 nla_put_failure:
 280         return -1;
 281 }
 282
 283 #ifdef CONFIG_NF_NAT_NEEDED
 284 static int
 285 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 286 {
 287         struct nlattr *nest_parms;
 288
 289         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 290         if (!nest_parms)
 291                 goto nla_put_failure;
 292
 293         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 294                      htonl(natseq->correction_pos));
 295         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 296                      htonl(natseq->offset_before));
 297         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 298                      htonl(natseq->offset_after));
 299
 300         nla_nest_end(skb, nest_parms);
 301
 302         return 0;
 303
 304 nla_put_failure:
 305         return -1;
 306 }
 307
 308 static inline int
 309 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 310 {
 311         struct nf_nat_seq *natseq;
 312         struct nf_conn_nat *nat = nfct_nat(ct);
 313
 314         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 315                 return 0;
 316
 317         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 318         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 319                 return -1;
 320
 321         natseq = &nat->seq[IP_CT_DIR_REPLY];
 322         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 323                 return -1;
 324
 325         return 0;
 326 }
 327 #else
 328 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 329 #endif
 330
 331 static inline int
 332 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 333 {
 334         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 335         return 0;
 336
 337 nla_put_failure:
 338         return -1;
 339 }
 340
 341 static inline int
 342 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 343 {
 344         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 345         return 0;
 346
 347 nla_put_failure:
 348         return -1;
 349 }
 350
 351 static int
 352 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 353                     int event, struct nf_conn *ct)
 354 {
 355         struct nlmsghdr *nlh;
 356         struct nfgenmsg *nfmsg;
 357         struct nlattr *nest_parms;
 358         unsigned int flags = pid ? NLM_F_MULTI : 0;
 359
 360         event |= NFNL_SUBSYS_CTNETLINK << 8;
 361         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 362         if (nlh == NULL)
 363                 goto nlmsg_failure;
 364
 365         nfmsg = nlmsg_data(nlh);
 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, nf_ct_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, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 381                 goto nla_put_failure;
 382         nla_nest_end(skb, nest_parms);
 383
 384         if (nf_ct_zone(ct))
 385                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 386
 387         if (ctnetlink_dump_status(skb, ct) < 0 ||
 388             ctnetlink_dump_timeout(skb, ct) < 0 ||
 389             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 390             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 391             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 392             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 393             ctnetlink_dump_mark(skb, ct) < 0 ||
 394             ctnetlink_dump_secmark(skb, ct) < 0 ||
 395             ctnetlink_dump_id(skb, ct) < 0 ||
 396             ctnetlink_dump_use(skb, ct) < 0 ||
 397             ctnetlink_dump_master(skb, ct) < 0 ||
 398             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 399                 goto nla_put_failure;
 400
 401         nlmsg_end(skb, nlh);
 402         return skb->len;
 403
 404 nlmsg_failure:
 405 nla_put_failure:
 406         nlmsg_cancel(skb, nlh);
 407         return -1;
 408 }
 409
 410 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 411 static inline size_t
 412 ctnetlink_proto_size(const struct nf_conn *ct)
 413 {
 414         struct nf_conntrack_l3proto *l3proto;
 415         struct nf_conntrack_l4proto *l4proto;
 416         size_t len = 0;
 417
 418         rcu_read_lock();
 419         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 420         len += l3proto->nla_size;
 421
 422         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 423         len += l4proto->nla_size;
 424         rcu_read_unlock();
 425
 426         return len;
 427 }
 428
 429 static inline size_t
 430 ctnetlink_counters_size(const struct nf_conn *ct)
 431 {
 432         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 433                 return 0;
 434         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 435                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 436                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 437                ;
 438 }
 439
 440 static inline size_t
 441 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 442 {
 443         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 444                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 445                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 446                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 447                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 448                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 449                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 450                + ctnetlink_counters_size(ct)
 451                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 452                + nla_total_size(0) /* CTA_PROTOINFO */
 453                + nla_total_size(0) /* CTA_HELP */
 454                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 455 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 456                + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
 457 #endif
 458 #ifdef CONFIG_NF_NAT_NEEDED
 459                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 460                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 461 #endif
 462 #ifdef CONFIG_NF_CONNTRACK_MARK
 463                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 464 #endif
 465                + ctnetlink_proto_size(ct)
 466                ;
 467 }
 468
 469 static int
 470 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 471 {
 472         struct net *net;
 473         struct nlmsghdr *nlh;
 474         struct nfgenmsg *nfmsg;
 475         struct nlattr *nest_parms;
 476         struct nf_conn *ct = item->ct;
 477         struct sk_buff *skb;
 478         unsigned int type;
 479         unsigned int flags = 0, group;
 480         int err;
 481
 482         /* ignore our fake conntrack entry */
 483         if (ct == &nf_conntrack_untracked)
 484                 return 0;
 485
 486         if (events & (1 << IPCT_DESTROY)) {
 487                 type = IPCTNL_MSG_CT_DELETE;
 488                 group = NFNLGRP_CONNTRACK_DESTROY;
 489         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 490                 type = IPCTNL_MSG_CT_NEW;
 491                 flags = NLM_F_CREATE|NLM_F_EXCL;
 492                 group = NFNLGRP_CONNTRACK_NEW;
 493         } else  if (events) {
 494                 type = IPCTNL_MSG_CT_NEW;
 495                 group = NFNLGRP_CONNTRACK_UPDATE;
 496         } else
 497                 return 0;
 498
 499         net = nf_ct_net(ct);
 500         if (!item->report && !nfnetlink_has_listeners(net, group))
 501                 return 0;
 502
 503         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 504         if (skb == NULL)
 505                 goto errout;
 506
 507         type |= NFNL_SUBSYS_CTNETLINK << 8;
 508         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 509         if (nlh == NULL)
 510                 goto nlmsg_failure;
 511
 512         nfmsg = nlmsg_data(nlh);
 513         nfmsg->nfgen_family = nf_ct_l3num(ct);
 514         nfmsg->version  = NFNETLINK_V0;
 515         nfmsg->res_id   = 0;
 516
 517         rcu_read_lock();
 518         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 519         if (!nest_parms)
 520                 goto nla_put_failure;
 521         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 522                 goto nla_put_failure;
 523         nla_nest_end(skb, nest_parms);
 524
 525         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 526         if (!nest_parms)
 527                 goto nla_put_failure;
 528         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 529                 goto nla_put_failure;
 530         nla_nest_end(skb, nest_parms);
 531
 532         if (nf_ct_zone(ct))
 533                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 534
 535         if (ctnetlink_dump_id(skb, ct) < 0)
 536                 goto nla_put_failure;
 537
 538         if (ctnetlink_dump_status(skb, ct) < 0)
 539                 goto nla_put_failure;
 540
 541         if (events & (1 << IPCT_DESTROY)) {
 542                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 543                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 544                         goto nla_put_failure;
 545         } else {
 546                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 547                         goto nla_put_failure;
 548
 549                 if (events & (1 << IPCT_PROTOINFO)
 550                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 551                         goto nla_put_failure;
 552
 553                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 554                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 555                         goto nla_put_failure;
 556
 557 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 558                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 559                     && ctnetlink_dump_secmark(skb, ct) < 0)
 560                         goto nla_put_failure;
 561 #endif
 562
 563                 if (events & (1 << IPCT_RELATED) &&
 564                     ctnetlink_dump_master(skb, ct) < 0)
 565                         goto nla_put_failure;
 566
 567                 if (events & (1 << IPCT_NATSEQADJ) &&
 568                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 569                         goto nla_put_failure;
 570         }
 571
 572 #ifdef CONFIG_NF_CONNTRACK_MARK
 573         if ((events & (1 << IPCT_MARK) || ct->mark)
 574             && ctnetlink_dump_mark(skb, ct) < 0)
 575                 goto nla_put_failure;
 576 #endif
 577         rcu_read_unlock();
 578
 579         nlmsg_end(skb, nlh);
 580         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 581                              GFP_ATOMIC);
 582         if (err == -ENOBUFS || err == -EAGAIN)
 583                 return -ENOBUFS;
 584
 585         return 0;
 586
 587 nla_put_failure:
 588         rcu_read_unlock();
 589         nlmsg_cancel(skb, nlh);
 590 nlmsg_failure:
 591         kfree_skb(skb);
 592 errout:
 593         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 594                 return -ENOBUFS;
 595
 596         return 0;
 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 net *net = sock_net(skb->sk);
 611         struct nf_conn *ct, *last;
 612         struct nf_conntrack_tuple_hash *h;
 613         struct hlist_nulls_node *n;
 614         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 615         u_int8_t l3proto = nfmsg->nfgen_family;
 616
 617         rcu_read_lock();
 618         last = (struct nf_conn *)cb->args[1];
 619         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 620 restart:
 621                 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
 622                                          hnnode) {
 623                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 624                                 continue;
 625                         ct = nf_ct_tuplehash_to_ctrack(h);
 626                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 627                                 continue;
 628                         /* Dump entries of a given L3 protocol number.
 629                          * If it is not specified, ie. l3proto == 0,
 630                          * then dump everything. */
 631                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 632                                 goto releasect;
 633                         if (cb->args[1]) {
 634                                 if (ct != last)
 635                                         goto releasect;
 636                                 cb->args[1] = 0;
 637                         }
 638                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 639                                                 cb->nlh->nlmsg_seq,
 640                                                 IPCTNL_MSG_CT_NEW, 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 const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 729         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 730         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 731 };
 732
 733 static int
 734 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 735                       struct nf_conntrack_tuple *tuple,
 736                       enum ctattr_tuple type, u_int8_t l3num)
 737 {
 738         struct nlattr *tb[CTA_TUPLE_MAX+1];
 739         int err;
 740
 741         memset(tuple, 0, sizeof(*tuple));
 742
 743         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 744
 745         if (!tb[CTA_TUPLE_IP])
 746                 return -EINVAL;
 747
 748         tuple->src.l3num = l3num;
 749
 750         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 751         if (err < 0)
 752                 return err;
 753
 754         if (!tb[CTA_TUPLE_PROTO])
 755                 return -EINVAL;
 756
 757         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 758         if (err < 0)
 759                 return err;
 760
 761         /* orig and expect tuples get DIR_ORIGINAL */
 762         if (type == CTA_TUPLE_REPLY)
 763                 tuple->dst.dir = IP_CT_DIR_REPLY;
 764         else
 765                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 766
 767         return 0;
 768 }
 769
 770 static int
 771 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 772 {
 773         if (attr)
 774 #ifdef CONFIG_NF_CONNTRACK_ZONES
 775                 *zone = ntohs(nla_get_be16(attr));
 776 #else
 777                 return -EOPNOTSUPP;
 778 #endif
 779         else
 780                 *zone = 0;
 781
 782         return 0;
 783 }
 784
 785 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 786         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 787 };
 788
 789 static inline int
 790 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 791 {
 792         struct nlattr *tb[CTA_HELP_MAX+1];
 793
 794         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 795
 796         if (!tb[CTA_HELP_NAME])
 797                 return -EINVAL;
 798
 799         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 800
 801         return 0;
 802 }
 803
 804 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 805         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 806         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 807         [CTA_STATUS]            = { .type = NLA_U32 },
 808         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 809         [CTA_HELP]              = { .type = NLA_NESTED },
 810         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 811         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 812         [CTA_MARK]              = { .type = NLA_U32 },
 813         [CTA_ID]                = { .type = NLA_U32 },
 814         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 815         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 816         [CTA_ZONE]              = { .type = NLA_U16 },
 817 };
 818
 819 static int
 820 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 821                         const struct nlmsghdr *nlh,
 822                         const struct nlattr * const cda[])
 823 {
 824         struct net *net = sock_net(ctnl);
 825         struct nf_conntrack_tuple_hash *h;
 826         struct nf_conntrack_tuple tuple;
 827         struct nf_conn *ct;
 828         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 829         u_int8_t u3 = nfmsg->nfgen_family;
 830         u16 zone;
 831         int err;
 832
 833         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 834         if (err < 0)
 835                 return err;
 836
 837         if (cda[CTA_TUPLE_ORIG])
 838                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 839         else if (cda[CTA_TUPLE_REPLY])
 840                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 841         else {
 842                 /* Flush the whole table */
 843                 nf_conntrack_flush_report(net,
 844                                          NETLINK_CB(skb).pid,
 845                                          nlmsg_report(nlh));
 846                 return 0;
 847         }
 848
 849         if (err < 0)
 850                 return err;
 851
 852         h = nf_conntrack_find_get(net, zone, &tuple);
 853         if (!h)
 854                 return -ENOENT;
 855
 856         ct = nf_ct_tuplehash_to_ctrack(h);
 857
 858         if (cda[CTA_ID]) {
 859                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 860                 if (id != (u32)(unsigned long)ct) {
 861                         nf_ct_put(ct);
 862                         return -ENOENT;
 863                 }
 864         }
 865
 866         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 867                                       NETLINK_CB(skb).pid,
 868                                       nlmsg_report(nlh)) < 0) {
 869                 nf_ct_delete_from_lists(ct);
 870                 /* we failed to report the event, try later */
 871                 nf_ct_insert_dying_list(ct);
 872                 nf_ct_put(ct);
 873                 return 0;
 874         }
 875
 876         /* death_by_timeout would report the event again */
 877         set_bit(IPS_DYING_BIT, &ct->status);
 878
 879         nf_ct_kill(ct);
 880         nf_ct_put(ct);
 881
 882         return 0;
 883 }
 884
 885 static int
 886 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 887                         const struct nlmsghdr *nlh,
 888                         const struct nlattr * const cda[])
 889 {
 890         struct net *net = sock_net(ctnl);
 891         struct nf_conntrack_tuple_hash *h;
 892         struct nf_conntrack_tuple tuple;
 893         struct nf_conn *ct;
 894         struct sk_buff *skb2 = NULL;
 895         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 896         u_int8_t u3 = nfmsg->nfgen_family;
 897         u16 zone;
 898         int err;
 899
 900         if (nlh->nlmsg_flags & NLM_F_DUMP)
 901                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 902                                           ctnetlink_done);
 903
 904         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 905         if (err < 0)
 906                 return err;
 907
 908         if (cda[CTA_TUPLE_ORIG])
 909                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 910         else if (cda[CTA_TUPLE_REPLY])
 911                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 912         else
 913                 return -EINVAL;
 914
 915         if (err < 0)
 916                 return err;
 917
 918         h = nf_conntrack_find_get(net, zone, &tuple);
 919         if (!h)
 920                 return -ENOENT;
 921
 922         ct = nf_ct_tuplehash_to_ctrack(h);
 923
 924         err = -ENOMEM;
 925         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 926         if (skb2 == NULL) {
 927                 nf_ct_put(ct);
 928                 return -ENOMEM;
 929         }
 930
 931         rcu_read_lock();
 932         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 933                                   IPCTNL_MSG_CT_NEW, ct);
 934         rcu_read_unlock();
 935         nf_ct_put(ct);
 936         if (err <= 0)
 937                 goto free;
 938
 939         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 940         if (err < 0)
 941                 goto out;
 942
 943         return 0;
 944
 945 free:
 946         kfree_skb(skb2);
 947 out:
 948         return err;
 949 }
 950
 951 #ifdef CONFIG_NF_NAT_NEEDED
 952 static int
 953 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 954                           enum nf_nat_manip_type manip,
 955                           const struct nlattr *attr)
 956 {
 957         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 958
 959         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 960         if (!parse_nat_setup) {
 961 #ifdef CONFIG_MODULES
 962                 rcu_read_unlock();
 963                 spin_unlock_bh(&nf_conntrack_lock);
 964                 nfnl_unlock();
 965                 if (request_module("nf-nat-ipv4") < 0) {
 966                         nfnl_lock();
 967                         spin_lock_bh(&nf_conntrack_lock);
 968                         rcu_read_lock();
 969                         return -EOPNOTSUPP;
 970                 }
 971                 nfnl_lock();
 972                 spin_lock_bh(&nf_conntrack_lock);
 973                 rcu_read_lock();
 974                 if (nfnetlink_parse_nat_setup_hook)
 975                         return -EAGAIN;
 976 #endif
 977                 return -EOPNOTSUPP;
 978         }
 979
 980         return parse_nat_setup(ct, manip, attr);
 981 }
 982 #endif
 983
 984 static int
 985 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
 986 {
 987         unsigned long d;
 988         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 989         d = ct->status ^ status;
 990
 991         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 992                 /* unchangeable */
 993                 return -EBUSY;
 994
 995         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 996                 /* SEEN_REPLY bit can only be set */
 997                 return -EBUSY;
 998
 999         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1000                 /* ASSURED bit can only be set */
1001                 return -EBUSY;
1002
1003         /* Be careful here, modifying NAT bits can screw up things,
1004          * so don't let users modify them directly if they don't pass
1005          * nf_nat_range. */
1006         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1007         return 0;
1008 }
1009
1010 static int
1011 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1012 {
1013 #ifdef CONFIG_NF_NAT_NEEDED
1014         int ret;
1015
1016         if (cda[CTA_NAT_DST]) {
1017                 ret = ctnetlink_parse_nat_setup(ct,
1018                                                 IP_NAT_MANIP_DST,
1019                                                 cda[CTA_NAT_DST]);
1020                 if (ret < 0)
1021                         return ret;
1022         }
1023         if (cda[CTA_NAT_SRC]) {
1024                 ret = ctnetlink_parse_nat_setup(ct,
1025                                                 IP_NAT_MANIP_SRC,
1026                                                 cda[CTA_NAT_SRC]);
1027                 if (ret < 0)
1028                         return ret;
1029         }
1030         return 0;
1031 #else
1032         return -EOPNOTSUPP;
1033 #endif
1034 }
1035
1036 static inline int
1037 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1038 {
1039         struct nf_conntrack_helper *helper;
1040         struct nf_conn_help *help = nfct_help(ct);
1041         char *helpname = NULL;
1042         int err;
1043
1044         /* don't change helper of sibling connections */
1045         if (ct->master)
1046                 return -EBUSY;
1047
1048         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1049         if (err < 0)
1050                 return err;
1051
1052         if (!strcmp(helpname, "")) {
1053                 if (help && help->helper) {
1054                         /* we had a helper before ... */
1055                         nf_ct_remove_expectations(ct);
1056                         rcu_assign_pointer(help->helper, NULL);
1057                 }
1058
1059                 return 0;
1060         }
1061
1062         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1063                                             nf_ct_protonum(ct));
1064         if (helper == NULL) {
1065 #ifdef CONFIG_MODULES
1066                 spin_unlock_bh(&nf_conntrack_lock);
1067
1068                 if (request_module("nfct-helper-%s", helpname) < 0) {
1069                         spin_lock_bh(&nf_conntrack_lock);
1070                         return -EOPNOTSUPP;
1071                 }
1072
1073                 spin_lock_bh(&nf_conntrack_lock);
1074                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1075                                                     nf_ct_protonum(ct));
1076                 if (helper)
1077                         return -EAGAIN;
1078 #endif
1079                 return -EOPNOTSUPP;
1080         }
1081
1082         if (help) {
1083                 if (help->helper == helper)
1084                         return 0;
1085                 if (help->helper)
1086                         return -EBUSY;
1087                 /* need to zero data of old helper */
1088                 memset(&help->help, 0, sizeof(help->help));
1089         } else {
1090                 /* we cannot set a helper for an existing conntrack */
1091                 return -EOPNOTSUPP;
1092         }
1093
1094         rcu_assign_pointer(help->helper, helper);
1095
1096         return 0;
1097 }
1098
1099 static inline int
1100 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1101 {
1102         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1103
1104         if (!del_timer(&ct->timeout))
1105                 return -ETIME;
1106
1107         ct->timeout.expires = jiffies + timeout * HZ;
1108         add_timer(&ct->timeout);
1109
1110         return 0;
1111 }
1112
1113 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1114         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1115         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1116         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1117 };
1118
1119 static inline int
1120 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1121 {
1122         const struct nlattr *attr = cda[CTA_PROTOINFO];
1123         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1124         struct nf_conntrack_l4proto *l4proto;
1125         int err = 0;
1126
1127         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1128
1129         rcu_read_lock();
1130         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1131         if (l4proto->from_nlattr)
1132                 err = l4proto->from_nlattr(tb, ct);
1133         rcu_read_unlock();
1134
1135         return err;
1136 }
1137
1138 #ifdef CONFIG_NF_NAT_NEEDED
1139 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1140         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1141         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1142         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1143 };
1144
1145 static inline int
1146 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1147 {
1148         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1149
1150         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1151
1152         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1153                 return -EINVAL;
1154
1155         natseq->correction_pos =
1156                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1157
1158         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1159                 return -EINVAL;
1160
1161         natseq->offset_before =
1162                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1163
1164         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1165                 return -EINVAL;
1166
1167         natseq->offset_after =
1168                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1169
1170         return 0;
1171 }
1172
1173 static int
1174 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1175                              const struct nlattr * const cda[])
1176 {
1177         int ret = 0;
1178         struct nf_conn_nat *nat = nfct_nat(ct);
1179
1180         if (!nat)
1181                 return 0;
1182
1183         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1184                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1185                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1186                 if (ret < 0)
1187                         return ret;
1188
1189                 ct->status |= IPS_SEQ_ADJUST;
1190         }
1191
1192         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1193                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1194                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1195                 if (ret < 0)
1196                         return ret;
1197
1198                 ct->status |= IPS_SEQ_ADJUST;
1199         }
1200
1201         return 0;
1202 }
1203 #endif
1204
1205 static int
1206 ctnetlink_change_conntrack(struct nf_conn *ct,
1207                            const struct nlattr * const cda[])
1208 {
1209         int err;
1210
1211         /* only allow NAT changes and master assignation for new conntracks */
1212         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1213                 return -EOPNOTSUPP;
1214
1215         if (cda[CTA_HELP]) {
1216                 err = ctnetlink_change_helper(ct, cda);
1217                 if (err < 0)
1218                         return err;
1219         }
1220
1221         if (cda[CTA_TIMEOUT]) {
1222                 err = ctnetlink_change_timeout(ct, cda);
1223                 if (err < 0)
1224                         return err;
1225         }
1226
1227         if (cda[CTA_STATUS]) {
1228                 err = ctnetlink_change_status(ct, cda);
1229                 if (err < 0)
1230                         return err;
1231         }
1232
1233         if (cda[CTA_PROTOINFO]) {
1234                 err = ctnetlink_change_protoinfo(ct, cda);
1235                 if (err < 0)
1236                         return err;
1237         }
1238
1239 #if defined(CONFIG_NF_CONNTRACK_MARK)
1240         if (cda[CTA_MARK])
1241                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1242 #endif
1243
1244 #ifdef CONFIG_NF_NAT_NEEDED
1245         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1246                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1247                 if (err < 0)
1248                         return err;
1249         }
1250 #endif
1251
1252         return 0;
1253 }
1254
1255 static struct nf_conn *
1256 ctnetlink_create_conntrack(struct net *net, u16 zone,
1257                            const struct nlattr * const cda[],
1258                            struct nf_conntrack_tuple *otuple,
1259                            struct nf_conntrack_tuple *rtuple,
1260                            u8 u3)
1261 {
1262         struct nf_conn *ct;
1263         int err = -EINVAL;
1264         struct nf_conntrack_helper *helper;
1265
1266         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1267         if (IS_ERR(ct))
1268                 return ERR_PTR(-ENOMEM);
1269
1270         if (!cda[CTA_TIMEOUT])
1271                 goto err1;
1272         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1273
1274         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1275
1276         rcu_read_lock();
1277         if (cda[CTA_HELP]) {
1278                 char *helpname = NULL;
1279
1280                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1281                 if (err < 0)
1282                         goto err2;
1283
1284                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1285                                                     nf_ct_protonum(ct));
1286                 if (helper == NULL) {
1287                         rcu_read_unlock();
1288 #ifdef CONFIG_MODULES
1289                         if (request_module("nfct-helper-%s", helpname) < 0) {
1290                                 err = -EOPNOTSUPP;
1291                                 goto err1;
1292                         }
1293
1294                         rcu_read_lock();
1295                         helper = __nf_conntrack_helper_find(helpname,
1296                                                             nf_ct_l3num(ct),
1297                                                             nf_ct_protonum(ct));
1298                         if (helper) {
1299                                 err = -EAGAIN;
1300                                 goto err2;
1301                         }
1302                         rcu_read_unlock();
1303 #endif
1304                         err = -EOPNOTSUPP;
1305                         goto err1;
1306                 } else {
1307                         struct nf_conn_help *help;
1308
1309                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1310                         if (help == NULL) {
1311                                 err = -ENOMEM;
1312                                 goto err2;
1313                         }
1314
1315                         /* not in hash table yet so not strictly necessary */
1316                         rcu_assign_pointer(help->helper, helper);
1317                 }
1318         } else {
1319                 /* try an implicit helper assignation */
1320                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1321                 if (err < 0)
1322                         goto err2;
1323         }
1324
1325         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1326                 err = ctnetlink_change_nat(ct, cda);
1327                 if (err < 0)
1328                         goto err2;
1329         }
1330
1331         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1332         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1333         /* we must add conntrack extensions before confirmation. */
1334         ct->status |= IPS_CONFIRMED;
1335
1336         if (cda[CTA_STATUS]) {
1337                 err = ctnetlink_change_status(ct, cda);
1338                 if (err < 0)
1339                         goto err2;
1340         }
1341
1342 #ifdef CONFIG_NF_NAT_NEEDED
1343         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1344                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1345                 if (err < 0)
1346                         goto err2;
1347         }
1348 #endif
1349
1350         if (cda[CTA_PROTOINFO]) {
1351                 err = ctnetlink_change_protoinfo(ct, cda);
1352                 if (err < 0)
1353                         goto err2;
1354         }
1355
1356 #if defined(CONFIG_NF_CONNTRACK_MARK)
1357         if (cda[CTA_MARK])
1358                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1359 #endif
1360
1361         /* setup master conntrack: this is a confirmed expectation */
1362         if (cda[CTA_TUPLE_MASTER]) {
1363                 struct nf_conntrack_tuple master;
1364                 struct nf_conntrack_tuple_hash *master_h;
1365                 struct nf_conn *master_ct;
1366
1367                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1368                 if (err < 0)
1369                         goto err2;
1370
1371                 master_h = nf_conntrack_find_get(net, zone, &master);
1372                 if (master_h == NULL) {
1373                         err = -ENOENT;
1374                         goto err2;
1375                 }
1376                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1377                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1378                 ct->master = master_ct;
1379         }
1380
1381         add_timer(&ct->timeout);
1382         nf_conntrack_hash_insert(ct);
1383         rcu_read_unlock();
1384
1385         return ct;
1386
1387 err2:
1388         rcu_read_unlock();
1389 err1:
1390         nf_conntrack_free(ct);
1391         return ERR_PTR(err);
1392 }
1393
1394 static int
1395 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1396                         const struct nlmsghdr *nlh,
1397                         const struct nlattr * const cda[])
1398 {
1399         struct net *net = sock_net(ctnl);
1400         struct nf_conntrack_tuple otuple, rtuple;
1401         struct nf_conntrack_tuple_hash *h = NULL;
1402         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1403         u_int8_t u3 = nfmsg->nfgen_family;
1404         u16 zone;
1405         int err;
1406
1407         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1408         if (err < 0)
1409                 return err;
1410
1411         if (cda[CTA_TUPLE_ORIG]) {
1412                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1413                 if (err < 0)
1414                         return err;
1415         }
1416
1417         if (cda[CTA_TUPLE_REPLY]) {
1418                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1419                 if (err < 0)
1420                         return err;
1421         }
1422
1423         spin_lock_bh(&nf_conntrack_lock);
1424         if (cda[CTA_TUPLE_ORIG])
1425                 h = __nf_conntrack_find(net, zone, &otuple);
1426         else if (cda[CTA_TUPLE_REPLY])
1427                 h = __nf_conntrack_find(net, zone, &rtuple);
1428
1429         if (h == NULL) {
1430                 err = -ENOENT;
1431                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1432                         struct nf_conn *ct;
1433                         enum ip_conntrack_events events;
1434
1435                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1436                                                         &rtuple, u3);
1437                         if (IS_ERR(ct)) {
1438                                 err = PTR_ERR(ct);
1439                                 goto out_unlock;
1440                         }
1441                         err = 0;
1442                         nf_conntrack_get(&ct->ct_general);
1443                         spin_unlock_bh(&nf_conntrack_lock);
1444                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1445                                 events = IPCT_RELATED;
1446                         else
1447                                 events = IPCT_NEW;
1448
1449                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1450                                                       (1 << IPCT_ASSURED) |
1451                                                       (1 << IPCT_HELPER) |
1452                                                       (1 << IPCT_PROTOINFO) |
1453                                                       (1 << IPCT_NATSEQADJ) |
1454                                                       (1 << IPCT_MARK) | events,
1455                                                       ct, NETLINK_CB(skb).pid,
1456                                                       nlmsg_report(nlh));
1457                         nf_ct_put(ct);
1458                 } else
1459                         spin_unlock_bh(&nf_conntrack_lock);
1460
1461                 return err;
1462         }
1463         /* implicit 'else' */
1464
1465         /* We manipulate the conntrack inside the global conntrack table lock,
1466          * so there's no need to increase the refcount */
1467         err = -EEXIST;
1468         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1469                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1470
1471                 err = ctnetlink_change_conntrack(ct, cda);
1472                 if (err == 0) {
1473                         nf_conntrack_get(&ct->ct_general);
1474                         spin_unlock_bh(&nf_conntrack_lock);
1475                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1476                                                       (1 << IPCT_ASSURED) |
1477                                                       (1 << IPCT_HELPER) |
1478                                                       (1 << IPCT_PROTOINFO) |
1479                                                       (1 << IPCT_NATSEQADJ) |
1480                                                       (1 << IPCT_MARK),
1481                                                       ct, NETLINK_CB(skb).pid,
1482                                                       nlmsg_report(nlh));
1483                         nf_ct_put(ct);
1484                 } else
1485                         spin_unlock_bh(&nf_conntrack_lock);
1486
1487                 return err;
1488         }
1489
1490 out_unlock:
1491         spin_unlock_bh(&nf_conntrack_lock);
1492         return err;
1493 }
1494
1495 /***********************************************************************
1496  * EXPECT
1497  ***********************************************************************/
1498
1499 static inline int
1500 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1501                          const struct nf_conntrack_tuple *tuple,
1502                          enum ctattr_expect type)
1503 {
1504         struct nlattr *nest_parms;
1505
1506         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1507         if (!nest_parms)
1508                 goto nla_put_failure;
1509         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1510                 goto nla_put_failure;
1511         nla_nest_end(skb, nest_parms);
1512
1513         return 0;
1514
1515 nla_put_failure:
1516         return -1;
1517 }
1518
1519 static inline int
1520 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1521                         const struct nf_conntrack_tuple *tuple,
1522                         const struct nf_conntrack_tuple_mask *mask)
1523 {
1524         int ret;
1525         struct nf_conntrack_l3proto *l3proto;
1526         struct nf_conntrack_l4proto *l4proto;
1527         struct nf_conntrack_tuple m;
1528         struct nlattr *nest_parms;
1529
1530         memset(&m, 0xFF, sizeof(m));
1531         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1532         m.src.u.all = mask->src.u.all;
1533         m.dst.protonum = tuple->dst.protonum;
1534
1535         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1536         if (!nest_parms)
1537                 goto nla_put_failure;
1538
1539         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1540         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1541
1542         if (unlikely(ret < 0))
1543                 goto nla_put_failure;
1544
1545         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1546         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1547         if (unlikely(ret < 0))
1548                 goto nla_put_failure;
1549
1550         nla_nest_end(skb, nest_parms);
1551
1552         return 0;
1553
1554 nla_put_failure:
1555         return -1;
1556 }
1557
1558 static int
1559 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1560                           const struct nf_conntrack_expect *exp)
1561 {
1562         struct nf_conn *master = exp->master;
1563         struct nf_conntrack_helper *helper;
1564         long timeout = (exp->timeout.expires - jiffies) / HZ;
1565
1566         if (timeout < 0)
1567                 timeout = 0;
1568
1569         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1570                 goto nla_put_failure;
1571         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1572                 goto nla_put_failure;
1573         if (ctnetlink_exp_dump_tuple(skb,
1574                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1575                                  CTA_EXPECT_MASTER) < 0)
1576                 goto nla_put_failure;
1577
1578         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1579         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1580         helper = rcu_dereference(nfct_help(master)->helper);
1581         if (helper)
1582                 NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1583
1584         return 0;
1585
1586 nla_put_failure:
1587         return -1;
1588 }
1589
1590 static int
1591 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1592                         int event, const struct nf_conntrack_expect *exp)
1593 {
1594         struct nlmsghdr *nlh;
1595         struct nfgenmsg *nfmsg;
1596         unsigned int flags = pid ? NLM_F_MULTI : 0;
1597
1598         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1599         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1600         if (nlh == NULL)
1601                 goto nlmsg_failure;
1602
1603         nfmsg = nlmsg_data(nlh);
1604         nfmsg->nfgen_family = exp->tuple.src.l3num;
1605         nfmsg->version      = NFNETLINK_V0;
1606         nfmsg->res_id       = 0;
1607
1608         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1609                 goto nla_put_failure;
1610
1611         nlmsg_end(skb, nlh);
1612         return skb->len;
1613
1614 nlmsg_failure:
1615 nla_put_failure:
1616         nlmsg_cancel(skb, nlh);
1617         return -1;
1618 }
1619
1620 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1621 static int
1622 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1623 {
1624         struct nf_conntrack_expect *exp = item->exp;
1625         struct net *net = nf_ct_exp_net(exp);
1626         struct nlmsghdr *nlh;
1627         struct nfgenmsg *nfmsg;
1628         struct sk_buff *skb;
1629         unsigned int type;
1630         int flags = 0;
1631
1632         if (events & (1 << IPEXP_NEW)) {
1633                 type = IPCTNL_MSG_EXP_NEW;
1634                 flags = NLM_F_CREATE|NLM_F_EXCL;
1635         } else
1636                 return 0;
1637
1638         if (!item->report &&
1639             !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1640                 return 0;
1641
1642         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1643         if (skb == NULL)
1644                 goto errout;
1645
1646         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1647         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1648         if (nlh == NULL)
1649                 goto nlmsg_failure;
1650
1651         nfmsg = nlmsg_data(nlh);
1652         nfmsg->nfgen_family = exp->tuple.src.l3num;
1653         nfmsg->version      = NFNETLINK_V0;
1654         nfmsg->res_id       = 0;
1655
1656         rcu_read_lock();
1657         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1658                 goto nla_put_failure;
1659         rcu_read_unlock();
1660
1661         nlmsg_end(skb, nlh);
1662         nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1663                        item->report, GFP_ATOMIC);
1664         return 0;
1665
1666 nla_put_failure:
1667         rcu_read_unlock();
1668         nlmsg_cancel(skb, nlh);
1669 nlmsg_failure:
1670         kfree_skb(skb);
1671 errout:
1672         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1673         return 0;
1674 }
1675 #endif
1676 static int ctnetlink_exp_done(struct netlink_callback *cb)
1677 {
1678         if (cb->args[1])
1679                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1680         return 0;
1681 }
1682
1683 static int
1684 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1685 {
1686         struct net *net = sock_net(skb->sk);
1687         struct nf_conntrack_expect *exp, *last;
1688         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1689         struct hlist_node *n;
1690         u_int8_t l3proto = nfmsg->nfgen_family;
1691
1692         rcu_read_lock();
1693         last = (struct nf_conntrack_expect *)cb->args[1];
1694         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1695 restart:
1696                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1697                                      hnode) {
1698                         if (l3proto && exp->tuple.src.l3num != l3proto)
1699                                 continue;
1700                         if (cb->args[1]) {
1701                                 if (exp != last)
1702                                         continue;
1703                                 cb->args[1] = 0;
1704                         }
1705                         if (ctnetlink_exp_fill_info(skb,
1706                                                     NETLINK_CB(cb->skb).pid,
1707                                                     cb->nlh->nlmsg_seq,
1708                                                     IPCTNL_MSG_EXP_NEW,
1709                                                     exp) < 0) {
1710                                 if (!atomic_inc_not_zero(&exp->use))
1711                                         continue;
1712                                 cb->args[1] = (unsigned long)exp;
1713                                 goto out;
1714                         }
1715                 }
1716                 if (cb->args[1]) {
1717                         cb->args[1] = 0;
1718                         goto restart;
1719                 }
1720         }
1721 out:
1722         rcu_read_unlock();
1723         if (last)
1724                 nf_ct_expect_put(last);
1725
1726         return skb->len;
1727 }
1728
1729 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1730         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1731         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1732         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1733         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1734         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1735         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1736 };
1737
1738 static int
1739 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1740                      const struct nlmsghdr *nlh,
1741                      const struct nlattr * const cda[])
1742 {
1743         struct net *net = sock_net(ctnl);
1744         struct nf_conntrack_tuple tuple;
1745         struct nf_conntrack_expect *exp;
1746         struct sk_buff *skb2;
1747         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1748         u_int8_t u3 = nfmsg->nfgen_family;
1749         u16 zone;
1750         int err;
1751
1752         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1753                 return netlink_dump_start(ctnl, skb, nlh,
1754                                           ctnetlink_exp_dump_table,
1755                                           ctnetlink_exp_done);
1756         }
1757
1758         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1759         if (err < 0)
1760                 return err;
1761
1762         if (cda[CTA_EXPECT_MASTER])
1763                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1764         else
1765                 return -EINVAL;
1766
1767         if (err < 0)
1768                 return err;
1769
1770         exp = nf_ct_expect_find_get(net, zone, &tuple);
1771         if (!exp)
1772                 return -ENOENT;
1773
1774         if (cda[CTA_EXPECT_ID]) {
1775                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1776                 if (ntohl(id) != (u32)(unsigned long)exp) {
1777                         nf_ct_expect_put(exp);
1778                         return -ENOENT;
1779                 }
1780         }
1781
1782         err = -ENOMEM;
1783         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1784         if (skb2 == NULL)
1785                 goto out;
1786
1787         rcu_read_lock();
1788         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1789                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1790         rcu_read_unlock();
1791         if (err <= 0)
1792                 goto free;
1793
1794         nf_ct_expect_put(exp);
1795
1796         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1797
1798 free:
1799         kfree_skb(skb2);
1800 out:
1801         nf_ct_expect_put(exp);
1802         return err;
1803 }
1804
1805 static int
1806 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1807                      const struct nlmsghdr *nlh,
1808                      const struct nlattr * const cda[])
1809 {
1810         struct net *net = sock_net(ctnl);
1811         struct nf_conntrack_expect *exp;
1812         struct nf_conntrack_tuple tuple;
1813         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1814         struct hlist_node *n, *next;
1815         u_int8_t u3 = nfmsg->nfgen_family;
1816         unsigned int i;
1817         u16 zone;
1818         int err;
1819
1820         if (cda[CTA_EXPECT_TUPLE]) {
1821                 /* delete a single expect by tuple */
1822                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1823                 if (err < 0)
1824                         return err;
1825
1826                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1827                 if (err < 0)
1828                         return err;
1829
1830                 /* bump usage count to 2 */
1831                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1832                 if (!exp)
1833                         return -ENOENT;
1834
1835                 if (cda[CTA_EXPECT_ID]) {
1836                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1837                         if (ntohl(id) != (u32)(unsigned long)exp) {
1838                                 nf_ct_expect_put(exp);
1839                                 return -ENOENT;
1840                         }
1841                 }
1842
1843                 /* after list removal, usage count == 1 */
1844                 nf_ct_unexpect_related(exp);
1845                 /* have to put what we 'get' above.
1846                  * after this line usage count == 0 */
1847                 nf_ct_expect_put(exp);
1848         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1849                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1850                 struct nf_conn_help *m_help;
1851
1852                 /* delete all expectations for this helper */
1853                 spin_lock_bh(&nf_conntrack_lock);
1854                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1855                         hlist_for_each_entry_safe(exp, n, next,
1856                                                   &net->ct.expect_hash[i],
1857                                                   hnode) {
1858                                 m_help = nfct_help(exp->master);
1859                                 if (!strcmp(m_help->helper->name, name) &&
1860                                     del_timer(&exp->timeout)) {
1861                                         nf_ct_unlink_expect(exp);
1862                                         nf_ct_expect_put(exp);
1863                                 }
1864                         }
1865                 }
1866                 spin_unlock_bh(&nf_conntrack_lock);
1867         } else {
1868                 /* This basically means we have to flush everything*/
1869                 spin_lock_bh(&nf_conntrack_lock);
1870                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1871                         hlist_for_each_entry_safe(exp, n, next,
1872                                                   &net->ct.expect_hash[i],
1873                                                   hnode) {
1874                                 if (del_timer(&exp->timeout)) {
1875                                         nf_ct_unlink_expect(exp);
1876                                         nf_ct_expect_put(exp);
1877                                 }
1878                         }
1879                 }
1880                 spin_unlock_bh(&nf_conntrack_lock);
1881         }
1882
1883         return 0;
1884 }
1885 static int
1886 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1887                         const struct nlattr * const cda[])
1888 {
1889         return -EOPNOTSUPP;
1890 }
1891
1892 static int
1893 ctnetlink_create_expect(struct net *net, u16 zone,
1894                         const struct nlattr * const cda[],
1895                         u_int8_t u3,
1896                         u32 pid, int report)
1897 {
1898         struct nf_conntrack_tuple tuple, mask, master_tuple;
1899         struct nf_conntrack_tuple_hash *h = NULL;
1900         struct nf_conntrack_expect *exp;
1901         struct nf_conn *ct;
1902         struct nf_conn_help *help;
1903         int err = 0;
1904
1905         /* caller guarantees that those three CTA_EXPECT_* exist */
1906         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1907         if (err < 0)
1908                 return err;
1909         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1910         if (err < 0)
1911                 return err;
1912         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1913         if (err < 0)
1914                 return err;
1915
1916         /* Look for master conntrack of this expectation */
1917         h = nf_conntrack_find_get(net, zone, &master_tuple);
1918         if (!h)
1919                 return -ENOENT;
1920         ct = nf_ct_tuplehash_to_ctrack(h);
1921         help = nfct_help(ct);
1922
1923         if (!help || !help->helper) {
1924                 /* such conntrack hasn't got any helper, abort */
1925                 err = -EOPNOTSUPP;
1926                 goto out;
1927         }
1928
1929         exp = nf_ct_expect_alloc(ct);
1930         if (!exp) {
1931                 err = -ENOMEM;
1932                 goto out;
1933         }
1934
1935         exp->class = 0;
1936         exp->expectfn = NULL;
1937         exp->flags = 0;
1938         exp->master = ct;
1939         exp->helper = NULL;
1940         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1941         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1942         exp->mask.src.u.all = mask.src.u.all;
1943
1944         err = nf_ct_expect_related_report(exp, pid, report);
1945         nf_ct_expect_put(exp);
1946
1947 out:
1948         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1949         return err;
1950 }
1951
1952 static int
1953 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1954                      const struct nlmsghdr *nlh,
1955                      const struct nlattr * const cda[])
1956 {
1957         struct net *net = sock_net(ctnl);
1958         struct nf_conntrack_tuple tuple;
1959         struct nf_conntrack_expect *exp;
1960         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1961         u_int8_t u3 = nfmsg->nfgen_family;
1962         u16 zone;
1963         int err;
1964
1965         if (!cda[CTA_EXPECT_TUPLE]
1966             || !cda[CTA_EXPECT_MASK]
1967             || !cda[CTA_EXPECT_MASTER])
1968                 return -EINVAL;
1969
1970         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1971         if (err < 0)
1972                 return err;
1973
1974         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1975         if (err < 0)
1976                 return err;
1977
1978         spin_lock_bh(&nf_conntrack_lock);
1979         exp = __nf_ct_expect_find(net, zone, &tuple);
1980
1981         if (!exp) {
1982                 spin_unlock_bh(&nf_conntrack_lock);
1983                 err = -ENOENT;
1984                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1985                         err = ctnetlink_create_expect(net, zone, cda,
1986                                                       u3,
1987                                                       NETLINK_CB(skb).pid,
1988                                                       nlmsg_report(nlh));
1989                 }
1990                 return err;
1991         }
1992
1993         err = -EEXIST;
1994         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1995                 err = ctnetlink_change_expect(exp, cda);
1996         spin_unlock_bh(&nf_conntrack_lock);
1997
1998         return err;
1999 }
2000
2001 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2002 static struct nf_ct_event_notifier ctnl_notifier = {
2003         .fcn = ctnetlink_conntrack_event,
2004 };
2005
2006 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2007         .fcn = ctnetlink_expect_event,
2008 };
2009 #endif
2010
2011 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2012         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2013                                             .attr_count = CTA_MAX,
2014                                             .policy = ct_nla_policy },
2015         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2016                                             .attr_count = CTA_MAX,
2017                                             .policy = ct_nla_policy },
2018         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2019                                             .attr_count = CTA_MAX,
2020                                             .policy = ct_nla_policy },
2021         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2022                                             .attr_count = CTA_MAX,
2023                                             .policy = ct_nla_policy },
2024 };
2025
2026 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2027         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2028                                             .attr_count = CTA_EXPECT_MAX,
2029                                             .policy = exp_nla_policy },
2030         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2031                                             .attr_count = CTA_EXPECT_MAX,
2032                                             .policy = exp_nla_policy },
2033         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2034                                             .attr_count = CTA_EXPECT_MAX,
2035                                             .policy = exp_nla_policy },
2036 };
2037
2038 static const struct nfnetlink_subsystem ctnl_subsys = {
2039         .name                           = "conntrack",
2040         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2041         .cb_count                       = IPCTNL_MSG_MAX,
2042         .cb                             = ctnl_cb,
2043 };
2044
2045 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2046         .name                           = "conntrack_expect",
2047         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2048         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2049         .cb                             = ctnl_exp_cb,
2050 };
2051
2052 MODULE_ALIAS("ip_conntrack_netlink");
2053 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2054 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2055
2056 static int __init ctnetlink_init(void)
2057 {
2058         int ret;
2059
2060         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2061         ret = nfnetlink_subsys_register(&ctnl_subsys);
2062         if (ret < 0) {
2063                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2064                 goto err_out;
2065         }
2066
2067         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2068         if (ret < 0) {
2069                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2070                 goto err_unreg_subsys;
2071         }
2072
2073 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2074         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2075         if (ret < 0) {
2076                 pr_err("ctnetlink_init: cannot register notifier.\n");
2077                 goto err_unreg_exp_subsys;
2078         }
2079
2080         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2081         if (ret < 0) {
2082                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2083                 goto err_unreg_notifier;
2084         }
2085 #endif
2086
2087         return 0;
2088
2089 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2090 err_unreg_notifier:
2091         nf_conntrack_unregister_notifier(&ctnl_notifier);
2092 err_unreg_exp_subsys:
2093         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2094 #endif
2095 err_unreg_subsys:
2096         nfnetlink_subsys_unregister(&ctnl_subsys);
2097 err_out:
2098         return ret;
2099 }
2100
2101 static void __exit ctnetlink_exit(void)
2102 {
2103         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2104
2105 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2106         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2107         nf_conntrack_unregister_notifier(&ctnl_notifier);
2108 #endif
2109
2110         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2111         nfnetlink_subsys_unregister(&ctnl_subsys);
2112 }
2113
2114 module_init(ctnetlink_init);
2115 module_exit(ctnetlink_exit);