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/security.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/errno.h>
  28 #include <linux/netlink.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/netfilter.h>
  34 #include <net/netlink.h>
  35 #include <net/sock.h>
  36 #include <net/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_core.h>
  38 #include <net/netfilter/nf_conntrack_expect.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40 #include <net/netfilter/nf_conntrack_l3proto.h>
  41 #include <net/netfilter/nf_conntrack_l4proto.h>
  42 #include <net/netfilter/nf_conntrack_tuple.h>
  43 #include <net/netfilter/nf_conntrack_acct.h>
  44 #include <net/netfilter/nf_conntrack_zones.h>
  45 #include <net/netfilter/nf_conntrack_timestamp.h>
  46 #ifdef CONFIG_NF_NAT_NEEDED
  47 #include <net/netfilter/nf_nat_core.h>
  48 #include <net/netfilter/nf_nat_protocol.h>
  49 #endif
  50
  51 #include <linux/netfilter/nfnetlink.h>
  52 #include <linux/netfilter/nfnetlink_conntrack.h>
  53
  54 MODULE_LICENSE("GPL");
  55
  56 static char __initdata version[] = "0.93";
  57
  58 static inline int
  59 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  60                             const struct nf_conntrack_tuple *tuple,
  61                             struct nf_conntrack_l4proto *l4proto)
  62 {
  63         int ret = 0;
  64         struct nlattr *nest_parms;
  65
  66         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  67         if (!nest_parms)
  68                 goto nla_put_failure;
  69         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  70
  71         if (likely(l4proto->tuple_to_nlattr))
  72                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  73
  74         nla_nest_end(skb, nest_parms);
  75
  76         return ret;
  77
  78 nla_put_failure:
  79         return -1;
  80 }
  81
  82 static inline int
  83 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  84                          const struct nf_conntrack_tuple *tuple,
  85                          struct nf_conntrack_l3proto *l3proto)
  86 {
  87         int ret = 0;
  88         struct nlattr *nest_parms;
  89
  90         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  91         if (!nest_parms)
  92                 goto nla_put_failure;
  93
  94         if (likely(l3proto->tuple_to_nlattr))
  95                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  96
  97         nla_nest_end(skb, nest_parms);
  98
  99         return ret;
 100
 101 nla_put_failure:
 102         return -1;
 103 }
 104
 105 static int
 106 ctnetlink_dump_tuples(struct sk_buff *skb,
 107                       const struct nf_conntrack_tuple *tuple)
 108 {
 109         int ret;
 110         struct nf_conntrack_l3proto *l3proto;
 111         struct nf_conntrack_l4proto *l4proto;
 112
 113         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 114         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 115
 116         if (unlikely(ret < 0))
 117                 return ret;
 118
 119         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 120         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 121
 122         return ret;
 123 }
 124
 125 static inline int
 126 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 127 {
 128         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 129         return 0;
 130
 131 nla_put_failure:
 132         return -1;
 133 }
 134
 135 static inline int
 136 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 137 {
 138         long timeout = (ct->timeout.expires - jiffies) / HZ;
 139
 140         if (timeout < 0)
 141                 timeout = 0;
 142
 143         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 144         return 0;
 145
 146 nla_put_failure:
 147         return -1;
 148 }
 149
 150 static inline int
 151 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 152 {
 153         struct nf_conntrack_l4proto *l4proto;
 154         struct nlattr *nest_proto;
 155         int ret;
 156
 157         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 158         if (!l4proto->to_nlattr)
 159                 return 0;
 160
 161         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 162         if (!nest_proto)
 163                 goto nla_put_failure;
 164
 165         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 166
 167         nla_nest_end(skb, nest_proto);
 168
 169         return ret;
 170
 171 nla_put_failure:
 172         return -1;
 173 }
 174
 175 static inline int
 176 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 177 {
 178         struct nlattr *nest_helper;
 179         const struct nf_conn_help *help = nfct_help(ct);
 180         struct nf_conntrack_helper *helper;
 181
 182         if (!help)
 183                 return 0;
 184
 185         helper = rcu_dereference(help->helper);
 186         if (!helper)
 187                 goto out;
 188
 189         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 190         if (!nest_helper)
 191                 goto nla_put_failure;
 192         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 193
 194         if (helper->to_nlattr)
 195                 helper->to_nlattr(skb, ct);
 196
 197         nla_nest_end(skb, nest_helper);
 198 out:
 199         return 0;
 200
 201 nla_put_failure:
 202         return -1;
 203 }
 204
 205 static int
 206 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 207                         enum ip_conntrack_dir dir)
 208 {
 209         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 210         struct nlattr *nest_count;
 211         const struct nf_conn_counter *acct;
 212
 213         acct = nf_conn_acct_find(ct);
 214         if (!acct)
 215                 return 0;
 216
 217         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 218         if (!nest_count)
 219                 goto nla_put_failure;
 220
 221         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 222                      cpu_to_be64(acct[dir].packets));
 223         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 224                      cpu_to_be64(acct[dir].bytes));
 225
 226         nla_nest_end(skb, nest_count);
 227
 228         return 0;
 229
 230 nla_put_failure:
 231         return -1;
 232 }
 233
 234 static int
 235 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 236 {
 237         struct nlattr *nest_count;
 238         const struct nf_conn_tstamp *tstamp;
 239
 240         tstamp = nf_conn_tstamp_find(ct);
 241         if (!tstamp)
 242                 return 0;
 243
 244         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 245         if (!nest_count)
 246                 goto nla_put_failure;
 247
 248         NLA_PUT_BE64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start));
 249         if (tstamp->stop != 0) {
 250                 NLA_PUT_BE64(skb, CTA_TIMESTAMP_STOP,
 251                              cpu_to_be64(tstamp->stop));
 252         }
 253         nla_nest_end(skb, nest_count);
 254
 255         return 0;
 256
 257 nla_put_failure:
 258         return -1;
 259 }
 260
 261 #ifdef CONFIG_NF_CONNTRACK_MARK
 262 static inline int
 263 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 264 {
 265         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 266         return 0;
 267
 268 nla_put_failure:
 269         return -1;
 270 }
 271 #else
 272 #define ctnetlink_dump_mark(a, b) (0)
 273 #endif
 274
 275 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 276 static inline int
 277 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 278 {
 279         struct nlattr *nest_secctx;
 280         int len, ret;
 281         char *secctx;
 282
 283         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 284         if (ret)
 285                 return 0;
 286
 287         ret = -1;
 288         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 289         if (!nest_secctx)
 290                 goto nla_put_failure;
 291
 292         NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
 293         nla_nest_end(skb, nest_secctx);
 294
 295         ret = 0;
 296 nla_put_failure:
 297         security_release_secctx(secctx, len);
 298         return ret;
 299 }
 300 #else
 301 #define ctnetlink_dump_secctx(a, b) (0)
 302 #endif
 303
 304 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 305
 306 static inline int
 307 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 308 {
 309         struct nlattr *nest_parms;
 310
 311         if (!(ct->status & IPS_EXPECTED))
 312                 return 0;
 313
 314         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 315         if (!nest_parms)
 316                 goto nla_put_failure;
 317         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 318                 goto nla_put_failure;
 319         nla_nest_end(skb, nest_parms);
 320
 321         return 0;
 322
 323 nla_put_failure:
 324         return -1;
 325 }
 326
 327 #ifdef CONFIG_NF_NAT_NEEDED
 328 static int
 329 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 330 {
 331         struct nlattr *nest_parms;
 332
 333         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 334         if (!nest_parms)
 335                 goto nla_put_failure;
 336
 337         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 338                      htonl(natseq->correction_pos));
 339         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 340                      htonl(natseq->offset_before));
 341         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 342                      htonl(natseq->offset_after));
 343
 344         nla_nest_end(skb, nest_parms);
 345
 346         return 0;
 347
 348 nla_put_failure:
 349         return -1;
 350 }
 351
 352 static inline int
 353 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 354 {
 355         struct nf_nat_seq *natseq;
 356         struct nf_conn_nat *nat = nfct_nat(ct);
 357
 358         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 359                 return 0;
 360
 361         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 362         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 363                 return -1;
 364
 365         natseq = &nat->seq[IP_CT_DIR_REPLY];
 366         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 367                 return -1;
 368
 369         return 0;
 370 }
 371 #else
 372 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 373 #endif
 374
 375 static inline int
 376 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 377 {
 378         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 379         return 0;
 380
 381 nla_put_failure:
 382         return -1;
 383 }
 384
 385 static inline int
 386 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 387 {
 388         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 389         return 0;
 390
 391 nla_put_failure:
 392         return -1;
 393 }
 394
 395 static int
 396 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 397                     int event, struct nf_conn *ct)
 398 {
 399         struct nlmsghdr *nlh;
 400         struct nfgenmsg *nfmsg;
 401         struct nlattr *nest_parms;
 402         unsigned int flags = pid ? NLM_F_MULTI : 0;
 403
 404         event |= NFNL_SUBSYS_CTNETLINK << 8;
 405         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 406         if (nlh == NULL)
 407                 goto nlmsg_failure;
 408
 409         nfmsg = nlmsg_data(nlh);
 410         nfmsg->nfgen_family = nf_ct_l3num(ct);
 411         nfmsg->version      = NFNETLINK_V0;
 412         nfmsg->res_id       = 0;
 413
 414         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 415         if (!nest_parms)
 416                 goto nla_put_failure;
 417         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 418                 goto nla_put_failure;
 419         nla_nest_end(skb, nest_parms);
 420
 421         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 422         if (!nest_parms)
 423                 goto nla_put_failure;
 424         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 425                 goto nla_put_failure;
 426         nla_nest_end(skb, nest_parms);
 427
 428         if (nf_ct_zone(ct))
 429                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 430
 431         if (ctnetlink_dump_status(skb, ct) < 0 ||
 432             ctnetlink_dump_timeout(skb, ct) < 0 ||
 433             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 434             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 435             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 436             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 437             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 438             ctnetlink_dump_mark(skb, ct) < 0 ||
 439             ctnetlink_dump_secctx(skb, ct) < 0 ||
 440             ctnetlink_dump_id(skb, ct) < 0 ||
 441             ctnetlink_dump_use(skb, ct) < 0 ||
 442             ctnetlink_dump_master(skb, ct) < 0 ||
 443             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 444                 goto nla_put_failure;
 445
 446         nlmsg_end(skb, nlh);
 447         return skb->len;
 448
 449 nlmsg_failure:
 450 nla_put_failure:
 451         nlmsg_cancel(skb, nlh);
 452         return -1;
 453 }
 454
 455 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 456 static inline size_t
 457 ctnetlink_proto_size(const struct nf_conn *ct)
 458 {
 459         struct nf_conntrack_l3proto *l3proto;
 460         struct nf_conntrack_l4proto *l4proto;
 461         size_t len = 0;
 462
 463         rcu_read_lock();
 464         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 465         len += l3proto->nla_size;
 466
 467         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 468         len += l4proto->nla_size;
 469         rcu_read_unlock();
 470
 471         return len;
 472 }
 473
 474 static inline size_t
 475 ctnetlink_counters_size(const struct nf_conn *ct)
 476 {
 477         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 478                 return 0;
 479         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 480                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 481                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 482                ;
 483 }
 484
 485 static inline int
 486 ctnetlink_secctx_size(const struct nf_conn *ct)
 487 {
 488 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 489         int len, ret;
 490
 491         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 492         if (ret)
 493                 return 0;
 494
 495         return nla_total_size(0) /* CTA_SECCTX */
 496                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 497 #else
 498         return 0;
 499 #endif
 500 }
 501
 502 static inline size_t
 503 ctnetlink_timestamp_size(const struct nf_conn *ct)
 504 {
 505 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 506         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 507                 return 0;
 508         return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
 509 #else
 510         return 0;
 511 #endif
 512 }
 513
 514 static inline size_t
 515 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 516 {
 517         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 518                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 519                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 520                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 521                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 522                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 523                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 524                + ctnetlink_counters_size(ct)
 525                + ctnetlink_timestamp_size(ct)
 526                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 527                + nla_total_size(0) /* CTA_PROTOINFO */
 528                + nla_total_size(0) /* CTA_HELP */
 529                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 530                + ctnetlink_secctx_size(ct)
 531 #ifdef CONFIG_NF_NAT_NEEDED
 532                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 533                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 534 #endif
 535 #ifdef CONFIG_NF_CONNTRACK_MARK
 536                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 537 #endif
 538                + ctnetlink_proto_size(ct)
 539                ;
 540 }
 541
 542 static int
 543 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 544 {
 545         struct net *net;
 546         struct nlmsghdr *nlh;
 547         struct nfgenmsg *nfmsg;
 548         struct nlattr *nest_parms;
 549         struct nf_conn *ct = item->ct;
 550         struct sk_buff *skb;
 551         unsigned int type;
 552         unsigned int flags = 0, group;
 553         int err;
 554
 555         /* ignore our fake conntrack entry */
 556         if (nf_ct_is_untracked(ct))
 557                 return 0;
 558
 559         if (events & (1 << IPCT_DESTROY)) {
 560                 type = IPCTNL_MSG_CT_DELETE;
 561                 group = NFNLGRP_CONNTRACK_DESTROY;
 562         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 563                 type = IPCTNL_MSG_CT_NEW;
 564                 flags = NLM_F_CREATE|NLM_F_EXCL;
 565                 group = NFNLGRP_CONNTRACK_NEW;
 566         } else  if (events) {
 567                 type = IPCTNL_MSG_CT_NEW;
 568                 group = NFNLGRP_CONNTRACK_UPDATE;
 569         } else
 570                 return 0;
 571
 572         net = nf_ct_net(ct);
 573         if (!item->report && !nfnetlink_has_listeners(net, group))
 574                 return 0;
 575
 576         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 577         if (skb == NULL)
 578                 goto errout;
 579
 580         type |= NFNL_SUBSYS_CTNETLINK << 8;
 581         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 582         if (nlh == NULL)
 583                 goto nlmsg_failure;
 584
 585         nfmsg = nlmsg_data(nlh);
 586         nfmsg->nfgen_family = nf_ct_l3num(ct);
 587         nfmsg->version  = NFNETLINK_V0;
 588         nfmsg->res_id   = 0;
 589
 590         rcu_read_lock();
 591         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 592         if (!nest_parms)
 593                 goto nla_put_failure;
 594         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 595                 goto nla_put_failure;
 596         nla_nest_end(skb, nest_parms);
 597
 598         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 599         if (!nest_parms)
 600                 goto nla_put_failure;
 601         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 602                 goto nla_put_failure;
 603         nla_nest_end(skb, nest_parms);
 604
 605         if (nf_ct_zone(ct))
 606                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 607
 608         if (ctnetlink_dump_id(skb, ct) < 0)
 609                 goto nla_put_failure;
 610
 611         if (ctnetlink_dump_status(skb, ct) < 0)
 612                 goto nla_put_failure;
 613
 614         if (events & (1 << IPCT_DESTROY)) {
 615                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 616                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 617                     ctnetlink_dump_timestamp(skb, ct) < 0)
 618                         goto nla_put_failure;
 619         } else {
 620                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 621                         goto nla_put_failure;
 622
 623                 if (events & (1 << IPCT_PROTOINFO)
 624                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 625                         goto nla_put_failure;
 626
 627                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 628                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 629                         goto nla_put_failure;
 630
 631 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 632                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 633                     && ctnetlink_dump_secctx(skb, ct) < 0)
 634                         goto nla_put_failure;
 635 #endif
 636
 637                 if (events & (1 << IPCT_RELATED) &&
 638                     ctnetlink_dump_master(skb, ct) < 0)
 639                         goto nla_put_failure;
 640
 641                 if (events & (1 << IPCT_NATSEQADJ) &&
 642                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 643                         goto nla_put_failure;
 644         }
 645
 646 #ifdef CONFIG_NF_CONNTRACK_MARK
 647         if ((events & (1 << IPCT_MARK) || ct->mark)
 648             && ctnetlink_dump_mark(skb, ct) < 0)
 649                 goto nla_put_failure;
 650 #endif
 651         rcu_read_unlock();
 652
 653         nlmsg_end(skb, nlh);
 654         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 655                              GFP_ATOMIC);
 656         if (err == -ENOBUFS || err == -EAGAIN)
 657                 return -ENOBUFS;
 658
 659         return 0;
 660
 661 nla_put_failure:
 662         rcu_read_unlock();
 663         nlmsg_cancel(skb, nlh);
 664 nlmsg_failure:
 665         kfree_skb(skb);
 666 errout:
 667         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 668                 return -ENOBUFS;
 669
 670         return 0;
 671 }
 672 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 673
 674 static int ctnetlink_done(struct netlink_callback *cb)
 675 {
 676         if (cb->args[1])
 677                 nf_ct_put((struct nf_conn *)cb->args[1]);
 678         return 0;
 679 }
 680
 681 static int
 682 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 683 {
 684         struct net *net = sock_net(skb->sk);
 685         struct nf_conn *ct, *last;
 686         struct nf_conntrack_tuple_hash *h;
 687         struct hlist_nulls_node *n;
 688         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 689         u_int8_t l3proto = nfmsg->nfgen_family;
 690
 691         spin_lock_bh(&nf_conntrack_lock);
 692         last = (struct nf_conn *)cb->args[1];
 693         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 694 restart:
 695                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 696                                          hnnode) {
 697                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 698                                 continue;
 699                         ct = nf_ct_tuplehash_to_ctrack(h);
 700                         /* Dump entries of a given L3 protocol number.
 701                          * If it is not specified, ie. l3proto == 0,
 702                          * then dump everything. */
 703                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 704                                 continue;
 705                         if (cb->args[1]) {
 706                                 if (ct != last)
 707                                         continue;
 708                                 cb->args[1] = 0;
 709                         }
 710                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 711                                                 cb->nlh->nlmsg_seq,
 712                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 713                                 nf_conntrack_get(&ct->ct_general);
 714                                 cb->args[1] = (unsigned long)ct;
 715                                 goto out;
 716                         }
 717
 718                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 719                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 720                                 struct nf_conn_counter *acct;
 721
 722                                 acct = nf_conn_acct_find(ct);
 723                                 if (acct)
 724                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 725                         }
 726                 }
 727                 if (cb->args[1]) {
 728                         cb->args[1] = 0;
 729                         goto restart;
 730                 }
 731         }
 732 out:
 733         spin_unlock_bh(&nf_conntrack_lock);
 734         if (last)
 735                 nf_ct_put(last);
 736
 737         return skb->len;
 738 }
 739
 740 static inline int
 741 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 742 {
 743         struct nlattr *tb[CTA_IP_MAX+1];
 744         struct nf_conntrack_l3proto *l3proto;
 745         int ret = 0;
 746
 747         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 748
 749         rcu_read_lock();
 750         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 751
 752         if (likely(l3proto->nlattr_to_tuple)) {
 753                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 754                                           l3proto->nla_policy);
 755                 if (ret == 0)
 756                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 757         }
 758
 759         rcu_read_unlock();
 760
 761         return ret;
 762 }
 763
 764 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 765         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 766 };
 767
 768 static inline int
 769 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 770                             struct nf_conntrack_tuple *tuple)
 771 {
 772         struct nlattr *tb[CTA_PROTO_MAX+1];
 773         struct nf_conntrack_l4proto *l4proto;
 774         int ret = 0;
 775
 776         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 777         if (ret < 0)
 778                 return ret;
 779
 780         if (!tb[CTA_PROTO_NUM])
 781                 return -EINVAL;
 782         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 783
 784         rcu_read_lock();
 785         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 786
 787         if (likely(l4proto->nlattr_to_tuple)) {
 788                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 789                                           l4proto->nla_policy);
 790                 if (ret == 0)
 791                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 792         }
 793
 794         rcu_read_unlock();
 795
 796         return ret;
 797 }
 798
 799 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 800         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 801         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 802 };
 803
 804 static int
 805 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 806                       struct nf_conntrack_tuple *tuple,
 807                       enum ctattr_type type, u_int8_t l3num)
 808 {
 809         struct nlattr *tb[CTA_TUPLE_MAX+1];
 810         int err;
 811
 812         memset(tuple, 0, sizeof(*tuple));
 813
 814         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 815
 816         if (!tb[CTA_TUPLE_IP])
 817                 return -EINVAL;
 818
 819         tuple->src.l3num = l3num;
 820
 821         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 822         if (err < 0)
 823                 return err;
 824
 825         if (!tb[CTA_TUPLE_PROTO])
 826                 return -EINVAL;
 827
 828         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 829         if (err < 0)
 830                 return err;
 831
 832         /* orig and expect tuples get DIR_ORIGINAL */
 833         if (type == CTA_TUPLE_REPLY)
 834                 tuple->dst.dir = IP_CT_DIR_REPLY;
 835         else
 836                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 837
 838         return 0;
 839 }
 840
 841 static int
 842 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 843 {
 844         if (attr)
 845 #ifdef CONFIG_NF_CONNTRACK_ZONES
 846                 *zone = ntohs(nla_get_be16(attr));
 847 #else
 848                 return -EOPNOTSUPP;
 849 #endif
 850         else
 851                 *zone = 0;
 852
 853         return 0;
 854 }
 855
 856 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 857         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 858 };
 859
 860 static inline int
 861 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 862 {
 863         struct nlattr *tb[CTA_HELP_MAX+1];
 864
 865         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 866
 867         if (!tb[CTA_HELP_NAME])
 868                 return -EINVAL;
 869
 870         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 871
 872         return 0;
 873 }
 874
 875 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 876         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 877         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 878         [CTA_STATUS]            = { .type = NLA_U32 },
 879         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 880         [CTA_HELP]              = { .type = NLA_NESTED },
 881         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 882         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 883         [CTA_MARK]              = { .type = NLA_U32 },
 884         [CTA_ID]                = { .type = NLA_U32 },
 885         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 886         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 887         [CTA_ZONE]              = { .type = NLA_U16 },
 888 };
 889
 890 static int
 891 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 892                         const struct nlmsghdr *nlh,
 893                         const struct nlattr * const cda[])
 894 {
 895         struct net *net = sock_net(ctnl);
 896         struct nf_conntrack_tuple_hash *h;
 897         struct nf_conntrack_tuple tuple;
 898         struct nf_conn *ct;
 899         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 900         u_int8_t u3 = nfmsg->nfgen_family;
 901         u16 zone;
 902         int err;
 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                 /* Flush the whole table */
 914                 nf_conntrack_flush_report(net,
 915                                          NETLINK_CB(skb).pid,
 916                                          nlmsg_report(nlh));
 917                 return 0;
 918         }
 919
 920         if (err < 0)
 921                 return err;
 922
 923         h = nf_conntrack_find_get(net, zone, &tuple);
 924         if (!h)
 925                 return -ENOENT;
 926
 927         ct = nf_ct_tuplehash_to_ctrack(h);
 928
 929         if (cda[CTA_ID]) {
 930                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 931                 if (id != (u32)(unsigned long)ct) {
 932                         nf_ct_put(ct);
 933                         return -ENOENT;
 934                 }
 935         }
 936
 937         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 938                                       NETLINK_CB(skb).pid,
 939                                       nlmsg_report(nlh)) < 0) {
 940                 nf_ct_delete_from_lists(ct);
 941                 /* we failed to report the event, try later */
 942                 nf_ct_insert_dying_list(ct);
 943                 nf_ct_put(ct);
 944                 return 0;
 945         }
 946
 947         /* death_by_timeout would report the event again */
 948         set_bit(IPS_DYING_BIT, &ct->status);
 949
 950         nf_ct_kill(ct);
 951         nf_ct_put(ct);
 952
 953         return 0;
 954 }
 955
 956 static int
 957 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 958                         const struct nlmsghdr *nlh,
 959                         const struct nlattr * const cda[])
 960 {
 961         struct net *net = sock_net(ctnl);
 962         struct nf_conntrack_tuple_hash *h;
 963         struct nf_conntrack_tuple tuple;
 964         struct nf_conn *ct;
 965         struct sk_buff *skb2 = NULL;
 966         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 967         u_int8_t u3 = nfmsg->nfgen_family;
 968         u16 zone;
 969         int err;
 970
 971         if (nlh->nlmsg_flags & NLM_F_DUMP)
 972                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 973                                           ctnetlink_done);
 974
 975         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 976         if (err < 0)
 977                 return err;
 978
 979         if (cda[CTA_TUPLE_ORIG])
 980                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 981         else if (cda[CTA_TUPLE_REPLY])
 982                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 983         else
 984                 return -EINVAL;
 985
 986         if (err < 0)
 987                 return err;
 988
 989         h = nf_conntrack_find_get(net, zone, &tuple);
 990         if (!h)
 991                 return -ENOENT;
 992
 993         ct = nf_ct_tuplehash_to_ctrack(h);
 994
 995         err = -ENOMEM;
 996         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 997         if (skb2 == NULL) {
 998                 nf_ct_put(ct);
 999                 return -ENOMEM;
1000         }
1001
1002         rcu_read_lock();
1003         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
1004                                   IPCTNL_MSG_CT_NEW, ct);
1005         rcu_read_unlock();
1006         nf_ct_put(ct);
1007         if (err <= 0)
1008                 goto free;
1009
1010         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1011         if (err < 0)
1012                 goto out;
1013
1014         return 0;
1015
1016 free:
1017         kfree_skb(skb2);
1018 out:
1019         /* this avoids a loop in nfnetlink. */
1020         return err == -EAGAIN ? -ENOBUFS : err;
1021 }
1022
1023 #ifdef CONFIG_NF_NAT_NEEDED
1024 static int
1025 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1026                           enum nf_nat_manip_type manip,
1027                           const struct nlattr *attr)
1028 {
1029         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1030
1031         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1032         if (!parse_nat_setup) {
1033 #ifdef CONFIG_MODULES
1034                 rcu_read_unlock();
1035                 spin_unlock_bh(&nf_conntrack_lock);
1036                 nfnl_unlock();
1037                 if (request_module("nf-nat-ipv4") < 0) {
1038                         nfnl_lock();
1039                         spin_lock_bh(&nf_conntrack_lock);
1040                         rcu_read_lock();
1041                         return -EOPNOTSUPP;
1042                 }
1043                 nfnl_lock();
1044                 spin_lock_bh(&nf_conntrack_lock);
1045                 rcu_read_lock();
1046                 if (nfnetlink_parse_nat_setup_hook)
1047                         return -EAGAIN;
1048 #endif
1049                 return -EOPNOTSUPP;
1050         }
1051
1052         return parse_nat_setup(ct, manip, attr);
1053 }
1054 #endif
1055
1056 static int
1057 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1058 {
1059         unsigned long d;
1060         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1061         d = ct->status ^ status;
1062
1063         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1064                 /* unchangeable */
1065                 return -EBUSY;
1066
1067         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1068                 /* SEEN_REPLY bit can only be set */
1069                 return -EBUSY;
1070
1071         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1072                 /* ASSURED bit can only be set */
1073                 return -EBUSY;
1074
1075         /* Be careful here, modifying NAT bits can screw up things,
1076          * so don't let users modify them directly if they don't pass
1077          * nf_nat_range. */
1078         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1079         return 0;
1080 }
1081
1082 static int
1083 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1084 {
1085 #ifdef CONFIG_NF_NAT_NEEDED
1086         int ret;
1087
1088         if (cda[CTA_NAT_DST]) {
1089                 ret = ctnetlink_parse_nat_setup(ct,
1090                                                 IP_NAT_MANIP_DST,
1091                                                 cda[CTA_NAT_DST]);
1092                 if (ret < 0)
1093                         return ret;
1094         }
1095         if (cda[CTA_NAT_SRC]) {
1096                 ret = ctnetlink_parse_nat_setup(ct,
1097                                                 IP_NAT_MANIP_SRC,
1098                                                 cda[CTA_NAT_SRC]);
1099                 if (ret < 0)
1100                         return ret;
1101         }
1102         return 0;
1103 #else
1104         return -EOPNOTSUPP;
1105 #endif
1106 }
1107
1108 static inline int
1109 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1110 {
1111         struct nf_conntrack_helper *helper;
1112         struct nf_conn_help *help = nfct_help(ct);
1113         char *helpname = NULL;
1114         int err;
1115
1116         /* don't change helper of sibling connections */
1117         if (ct->master)
1118                 return -EBUSY;
1119
1120         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1121         if (err < 0)
1122                 return err;
1123
1124         if (!strcmp(helpname, "")) {
1125                 if (help && help->helper) {
1126                         /* we had a helper before ... */
1127                         nf_ct_remove_expectations(ct);
1128                         rcu_assign_pointer(help->helper, NULL);
1129                 }
1130
1131                 return 0;
1132         }
1133
1134         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1135                                             nf_ct_protonum(ct));
1136         if (helper == NULL) {
1137 #ifdef CONFIG_MODULES
1138                 spin_unlock_bh(&nf_conntrack_lock);
1139
1140                 if (request_module("nfct-helper-%s", helpname) < 0) {
1141                         spin_lock_bh(&nf_conntrack_lock);
1142                         return -EOPNOTSUPP;
1143                 }
1144
1145                 spin_lock_bh(&nf_conntrack_lock);
1146                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1147                                                     nf_ct_protonum(ct));
1148                 if (helper)
1149                         return -EAGAIN;
1150 #endif
1151                 return -EOPNOTSUPP;
1152         }
1153
1154         if (help) {
1155                 if (help->helper == helper)
1156                         return 0;
1157                 if (help->helper)
1158                         return -EBUSY;
1159                 /* need to zero data of old helper */
1160                 memset(&help->help, 0, sizeof(help->help));
1161         } else {
1162                 /* we cannot set a helper for an existing conntrack */
1163                 return -EOPNOTSUPP;
1164         }
1165
1166         rcu_assign_pointer(help->helper, helper);
1167
1168         return 0;
1169 }
1170
1171 static inline int
1172 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1173 {
1174         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1175
1176         if (!del_timer(&ct->timeout))
1177                 return -ETIME;
1178
1179         ct->timeout.expires = jiffies + timeout * HZ;
1180         add_timer(&ct->timeout);
1181
1182         return 0;
1183 }
1184
1185 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1186         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1187         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1188         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1189 };
1190
1191 static inline int
1192 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1193 {
1194         const struct nlattr *attr = cda[CTA_PROTOINFO];
1195         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1196         struct nf_conntrack_l4proto *l4proto;
1197         int err = 0;
1198
1199         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1200
1201         rcu_read_lock();
1202         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1203         if (l4proto->from_nlattr)
1204                 err = l4proto->from_nlattr(tb, ct);
1205         rcu_read_unlock();
1206
1207         return err;
1208 }
1209
1210 #ifdef CONFIG_NF_NAT_NEEDED
1211 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1212         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1213         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1214         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1215 };
1216
1217 static inline int
1218 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1219 {
1220         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1221
1222         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1223
1224         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1225                 return -EINVAL;
1226
1227         natseq->correction_pos =
1228                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1229
1230         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1231                 return -EINVAL;
1232
1233         natseq->offset_before =
1234                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1235
1236         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1237                 return -EINVAL;
1238
1239         natseq->offset_after =
1240                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1241
1242         return 0;
1243 }
1244
1245 static int
1246 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1247                              const struct nlattr * const cda[])
1248 {
1249         int ret = 0;
1250         struct nf_conn_nat *nat = nfct_nat(ct);
1251
1252         if (!nat)
1253                 return 0;
1254
1255         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1256                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1257                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1258                 if (ret < 0)
1259                         return ret;
1260
1261                 ct->status |= IPS_SEQ_ADJUST;
1262         }
1263
1264         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1265                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1266                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1267                 if (ret < 0)
1268                         return ret;
1269
1270                 ct->status |= IPS_SEQ_ADJUST;
1271         }
1272
1273         return 0;
1274 }
1275 #endif
1276
1277 static int
1278 ctnetlink_change_conntrack(struct nf_conn *ct,
1279                            const struct nlattr * const cda[])
1280 {
1281         int err;
1282
1283         /* only allow NAT changes and master assignation for new conntracks */
1284         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1285                 return -EOPNOTSUPP;
1286
1287         if (cda[CTA_HELP]) {
1288                 err = ctnetlink_change_helper(ct, cda);
1289                 if (err < 0)
1290                         return err;
1291         }
1292
1293         if (cda[CTA_TIMEOUT]) {
1294                 err = ctnetlink_change_timeout(ct, cda);
1295                 if (err < 0)
1296                         return err;
1297         }
1298
1299         if (cda[CTA_STATUS]) {
1300                 err = ctnetlink_change_status(ct, cda);
1301                 if (err < 0)
1302                         return err;
1303         }
1304
1305         if (cda[CTA_PROTOINFO]) {
1306                 err = ctnetlink_change_protoinfo(ct, cda);
1307                 if (err < 0)
1308                         return err;
1309         }
1310
1311 #if defined(CONFIG_NF_CONNTRACK_MARK)
1312         if (cda[CTA_MARK])
1313                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1314 #endif
1315
1316 #ifdef CONFIG_NF_NAT_NEEDED
1317         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1318                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1319                 if (err < 0)
1320                         return err;
1321         }
1322 #endif
1323
1324         return 0;
1325 }
1326
1327 static struct nf_conn *
1328 ctnetlink_create_conntrack(struct net *net, u16 zone,
1329                            const struct nlattr * const cda[],
1330                            struct nf_conntrack_tuple *otuple,
1331                            struct nf_conntrack_tuple *rtuple,
1332                            u8 u3)
1333 {
1334         struct nf_conn *ct;
1335         int err = -EINVAL;
1336         struct nf_conntrack_helper *helper;
1337         struct nf_conn_tstamp *tstamp;
1338
1339         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1340         if (IS_ERR(ct))
1341                 return ERR_PTR(-ENOMEM);
1342
1343         if (!cda[CTA_TIMEOUT])
1344                 goto err1;
1345         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1346
1347         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1348
1349         rcu_read_lock();
1350         if (cda[CTA_HELP]) {
1351                 char *helpname = NULL;
1352
1353                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1354                 if (err < 0)
1355                         goto err2;
1356
1357                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1358                                                     nf_ct_protonum(ct));
1359                 if (helper == NULL) {
1360                         rcu_read_unlock();
1361 #ifdef CONFIG_MODULES
1362                         if (request_module("nfct-helper-%s", helpname) < 0) {
1363                                 err = -EOPNOTSUPP;
1364                                 goto err1;
1365                         }
1366
1367                         rcu_read_lock();
1368                         helper = __nf_conntrack_helper_find(helpname,
1369                                                             nf_ct_l3num(ct),
1370                                                             nf_ct_protonum(ct));
1371                         if (helper) {
1372                                 err = -EAGAIN;
1373                                 goto err2;
1374                         }
1375                         rcu_read_unlock();
1376 #endif
1377                         err = -EOPNOTSUPP;
1378                         goto err1;
1379                 } else {
1380                         struct nf_conn_help *help;
1381
1382                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1383                         if (help == NULL) {
1384                                 err = -ENOMEM;
1385                                 goto err2;
1386                         }
1387
1388                         /* not in hash table yet so not strictly necessary */
1389                         rcu_assign_pointer(help->helper, helper);
1390                 }
1391         } else {
1392                 /* try an implicit helper assignation */
1393                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1394                 if (err < 0)
1395                         goto err2;
1396         }
1397
1398         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1399                 err = ctnetlink_change_nat(ct, cda);
1400                 if (err < 0)
1401                         goto err2;
1402         }
1403
1404         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1405         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1406         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1407         /* we must add conntrack extensions before confirmation. */
1408         ct->status |= IPS_CONFIRMED;
1409
1410         if (cda[CTA_STATUS]) {
1411                 err = ctnetlink_change_status(ct, cda);
1412                 if (err < 0)
1413                         goto err2;
1414         }
1415
1416 #ifdef CONFIG_NF_NAT_NEEDED
1417         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1418                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1419                 if (err < 0)
1420                         goto err2;
1421         }
1422 #endif
1423
1424         memset(&ct->proto, 0, sizeof(ct->proto));
1425         if (cda[CTA_PROTOINFO]) {
1426                 err = ctnetlink_change_protoinfo(ct, cda);
1427                 if (err < 0)
1428                         goto err2;
1429         }
1430
1431 #if defined(CONFIG_NF_CONNTRACK_MARK)
1432         if (cda[CTA_MARK])
1433                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1434 #endif
1435
1436         /* setup master conntrack: this is a confirmed expectation */
1437         if (cda[CTA_TUPLE_MASTER]) {
1438                 struct nf_conntrack_tuple master;
1439                 struct nf_conntrack_tuple_hash *master_h;
1440                 struct nf_conn *master_ct;
1441
1442                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1443                 if (err < 0)
1444                         goto err2;
1445
1446                 master_h = nf_conntrack_find_get(net, zone, &master);
1447                 if (master_h == NULL) {
1448                         err = -ENOENT;
1449                         goto err2;
1450                 }
1451                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1452                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1453                 ct->master = master_ct;
1454         }
1455         tstamp = nf_conn_tstamp_find(ct);
1456         if (tstamp)
1457                 tstamp->start = ktime_to_ns(ktime_get_real());
1458
1459         add_timer(&ct->timeout);
1460         nf_conntrack_hash_insert(ct);
1461         rcu_read_unlock();
1462
1463         return ct;
1464
1465 err2:
1466         rcu_read_unlock();
1467 err1:
1468         nf_conntrack_free(ct);
1469         return ERR_PTR(err);
1470 }
1471
1472 static int
1473 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1474                         const struct nlmsghdr *nlh,
1475                         const struct nlattr * const cda[])
1476 {
1477         struct net *net = sock_net(ctnl);
1478         struct nf_conntrack_tuple otuple, rtuple;
1479         struct nf_conntrack_tuple_hash *h = NULL;
1480         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1481         u_int8_t u3 = nfmsg->nfgen_family;
1482         u16 zone;
1483         int err;
1484
1485         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1486         if (err < 0)
1487                 return err;
1488
1489         if (cda[CTA_TUPLE_ORIG]) {
1490                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1491                 if (err < 0)
1492                         return err;
1493         }
1494
1495         if (cda[CTA_TUPLE_REPLY]) {
1496                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1497                 if (err < 0)
1498                         return err;
1499         }
1500
1501         spin_lock_bh(&nf_conntrack_lock);
1502         if (cda[CTA_TUPLE_ORIG])
1503                 h = __nf_conntrack_find(net, zone, &otuple);
1504         else if (cda[CTA_TUPLE_REPLY])
1505                 h = __nf_conntrack_find(net, zone, &rtuple);
1506
1507         if (h == NULL) {
1508                 err = -ENOENT;
1509                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1510                         struct nf_conn *ct;
1511                         enum ip_conntrack_events events;
1512
1513                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1514                                                         &rtuple, u3);
1515                         if (IS_ERR(ct)) {
1516                                 err = PTR_ERR(ct);
1517                                 goto out_unlock;
1518                         }
1519                         err = 0;
1520                         nf_conntrack_get(&ct->ct_general);
1521                         spin_unlock_bh(&nf_conntrack_lock);
1522                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1523                                 events = IPCT_RELATED;
1524                         else
1525                                 events = IPCT_NEW;
1526
1527                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1528                                                       (1 << IPCT_ASSURED) |
1529                                                       (1 << IPCT_HELPER) |
1530                                                       (1 << IPCT_PROTOINFO) |
1531                                                       (1 << IPCT_NATSEQADJ) |
1532                                                       (1 << IPCT_MARK) | events,
1533                                                       ct, NETLINK_CB(skb).pid,
1534                                                       nlmsg_report(nlh));
1535                         nf_ct_put(ct);
1536                 } else
1537                         spin_unlock_bh(&nf_conntrack_lock);
1538
1539                 return err;
1540         }
1541         /* implicit 'else' */
1542
1543         /* We manipulate the conntrack inside the global conntrack table lock,
1544          * so there's no need to increase the refcount */
1545         err = -EEXIST;
1546         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1547                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1548
1549                 err = ctnetlink_change_conntrack(ct, cda);
1550                 if (err == 0) {
1551                         nf_conntrack_get(&ct->ct_general);
1552                         spin_unlock_bh(&nf_conntrack_lock);
1553                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1554                                                       (1 << IPCT_ASSURED) |
1555                                                       (1 << IPCT_HELPER) |
1556                                                       (1 << IPCT_PROTOINFO) |
1557                                                       (1 << IPCT_NATSEQADJ) |
1558                                                       (1 << IPCT_MARK),
1559                                                       ct, NETLINK_CB(skb).pid,
1560                                                       nlmsg_report(nlh));
1561                         nf_ct_put(ct);
1562                 } else
1563                         spin_unlock_bh(&nf_conntrack_lock);
1564
1565                 return err;
1566         }
1567
1568 out_unlock:
1569         spin_unlock_bh(&nf_conntrack_lock);
1570         return err;
1571 }
1572
1573 /***********************************************************************
1574  * EXPECT
1575  ***********************************************************************/
1576
1577 static inline int
1578 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1579                          const struct nf_conntrack_tuple *tuple,
1580                          enum ctattr_expect type)
1581 {
1582         struct nlattr *nest_parms;
1583
1584         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1585         if (!nest_parms)
1586                 goto nla_put_failure;
1587         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1588                 goto nla_put_failure;
1589         nla_nest_end(skb, nest_parms);
1590
1591         return 0;
1592
1593 nla_put_failure:
1594         return -1;
1595 }
1596
1597 static inline int
1598 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1599                         const struct nf_conntrack_tuple *tuple,
1600                         const struct nf_conntrack_tuple_mask *mask)
1601 {
1602         int ret;
1603         struct nf_conntrack_l3proto *l3proto;
1604         struct nf_conntrack_l4proto *l4proto;
1605         struct nf_conntrack_tuple m;
1606         struct nlattr *nest_parms;
1607
1608         memset(&m, 0xFF, sizeof(m));
1609         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1610         m.src.u.all = mask->src.u.all;
1611         m.dst.protonum = tuple->dst.protonum;
1612
1613         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1614         if (!nest_parms)
1615                 goto nla_put_failure;
1616
1617         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1618         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1619
1620         if (unlikely(ret < 0))
1621                 goto nla_put_failure;
1622
1623         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1624         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1625         if (unlikely(ret < 0))
1626                 goto nla_put_failure;
1627
1628         nla_nest_end(skb, nest_parms);
1629
1630         return 0;
1631
1632 nla_put_failure:
1633         return -1;
1634 }
1635
1636 static int
1637 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1638                           const struct nf_conntrack_expect *exp)
1639 {
1640         struct nf_conn *master = exp->master;
1641         long timeout = (exp->timeout.expires - jiffies) / HZ;
1642         struct nf_conn_help *help;
1643
1644         if (timeout < 0)
1645                 timeout = 0;
1646
1647         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1648                 goto nla_put_failure;
1649         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1650                 goto nla_put_failure;
1651         if (ctnetlink_exp_dump_tuple(skb,
1652                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1653                                  CTA_EXPECT_MASTER) < 0)
1654                 goto nla_put_failure;
1655
1656         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1657         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1658         NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1659         help = nfct_help(master);
1660         if (help) {
1661                 struct nf_conntrack_helper *helper;
1662
1663                 helper = rcu_dereference(help->helper);
1664                 if (helper)
1665                         NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1666         }
1667
1668         return 0;
1669
1670 nla_put_failure:
1671         return -1;
1672 }
1673
1674 static int
1675 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1676                         int event, const struct nf_conntrack_expect *exp)
1677 {
1678         struct nlmsghdr *nlh;
1679         struct nfgenmsg *nfmsg;
1680         unsigned int flags = pid ? NLM_F_MULTI : 0;
1681
1682         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1683         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1684         if (nlh == NULL)
1685                 goto nlmsg_failure;
1686
1687         nfmsg = nlmsg_data(nlh);
1688         nfmsg->nfgen_family = exp->tuple.src.l3num;
1689         nfmsg->version      = NFNETLINK_V0;
1690         nfmsg->res_id       = 0;
1691
1692         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1693                 goto nla_put_failure;
1694
1695         nlmsg_end(skb, nlh);
1696         return skb->len;
1697
1698 nlmsg_failure:
1699 nla_put_failure:
1700         nlmsg_cancel(skb, nlh);
1701         return -1;
1702 }
1703
1704 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1705 static int
1706 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1707 {
1708         struct nf_conntrack_expect *exp = item->exp;
1709         struct net *net = nf_ct_exp_net(exp);
1710         struct nlmsghdr *nlh;
1711         struct nfgenmsg *nfmsg;
1712         struct sk_buff *skb;
1713         unsigned int type, group;
1714         int flags = 0;
1715
1716         if (events & (1 << IPEXP_DESTROY)) {
1717                 type = IPCTNL_MSG_EXP_DELETE;
1718                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1719         } else if (events & (1 << IPEXP_NEW)) {
1720                 type = IPCTNL_MSG_EXP_NEW;
1721                 flags = NLM_F_CREATE|NLM_F_EXCL;
1722                 group = NFNLGRP_CONNTRACK_EXP_NEW;
1723         } else
1724                 return 0;
1725
1726         if (!item->report && !nfnetlink_has_listeners(net, group))
1727                 return 0;
1728
1729         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1730         if (skb == NULL)
1731                 goto errout;
1732
1733         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1734         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1735         if (nlh == NULL)
1736                 goto nlmsg_failure;
1737
1738         nfmsg = nlmsg_data(nlh);
1739         nfmsg->nfgen_family = exp->tuple.src.l3num;
1740         nfmsg->version      = NFNETLINK_V0;
1741         nfmsg->res_id       = 0;
1742
1743         rcu_read_lock();
1744         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1745                 goto nla_put_failure;
1746         rcu_read_unlock();
1747
1748         nlmsg_end(skb, nlh);
1749         nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1750         return 0;
1751
1752 nla_put_failure:
1753         rcu_read_unlock();
1754         nlmsg_cancel(skb, nlh);
1755 nlmsg_failure:
1756         kfree_skb(skb);
1757 errout:
1758         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1759         return 0;
1760 }
1761 #endif
1762 static int ctnetlink_exp_done(struct netlink_callback *cb)
1763 {
1764         if (cb->args[1])
1765                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1766         return 0;
1767 }
1768
1769 static int
1770 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1771 {
1772         struct net *net = sock_net(skb->sk);
1773         struct nf_conntrack_expect *exp, *last;
1774         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1775         struct hlist_node *n;
1776         u_int8_t l3proto = nfmsg->nfgen_family;
1777
1778         rcu_read_lock();
1779         last = (struct nf_conntrack_expect *)cb->args[1];
1780         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1781 restart:
1782                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1783                                      hnode) {
1784                         if (l3proto && exp->tuple.src.l3num != l3proto)
1785                                 continue;
1786                         if (cb->args[1]) {
1787                                 if (exp != last)
1788                                         continue;
1789                                 cb->args[1] = 0;
1790                         }
1791                         if (ctnetlink_exp_fill_info(skb,
1792                                                     NETLINK_CB(cb->skb).pid,
1793                                                     cb->nlh->nlmsg_seq,
1794                                                     IPCTNL_MSG_EXP_NEW,
1795                                                     exp) < 0) {
1796                                 if (!atomic_inc_not_zero(&exp->use))
1797                                         continue;
1798                                 cb->args[1] = (unsigned long)exp;
1799                                 goto out;
1800                         }
1801                 }
1802                 if (cb->args[1]) {
1803                         cb->args[1] = 0;
1804                         goto restart;
1805                 }
1806         }
1807 out:
1808         rcu_read_unlock();
1809         if (last)
1810                 nf_ct_expect_put(last);
1811
1812         return skb->len;
1813 }
1814
1815 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1816         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1817         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1818         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1819         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1820         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1821         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1822         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1823         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1824 };
1825
1826 static int
1827 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1828                      const struct nlmsghdr *nlh,
1829                      const struct nlattr * const cda[])
1830 {
1831         struct net *net = sock_net(ctnl);
1832         struct nf_conntrack_tuple tuple;
1833         struct nf_conntrack_expect *exp;
1834         struct sk_buff *skb2;
1835         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1836         u_int8_t u3 = nfmsg->nfgen_family;
1837         u16 zone;
1838         int err;
1839
1840         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1841                 return netlink_dump_start(ctnl, skb, nlh,
1842                                           ctnetlink_exp_dump_table,
1843                                           ctnetlink_exp_done);
1844         }
1845
1846         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1847         if (err < 0)
1848                 return err;
1849
1850         if (cda[CTA_EXPECT_MASTER])
1851                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1852         else
1853                 return -EINVAL;
1854
1855         if (err < 0)
1856                 return err;
1857
1858         exp = nf_ct_expect_find_get(net, zone, &tuple);
1859         if (!exp)
1860                 return -ENOENT;
1861
1862         if (cda[CTA_EXPECT_ID]) {
1863                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1864                 if (ntohl(id) != (u32)(unsigned long)exp) {
1865                         nf_ct_expect_put(exp);
1866                         return -ENOENT;
1867                 }
1868         }
1869
1870         err = -ENOMEM;
1871         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1872         if (skb2 == NULL)
1873                 goto out;
1874
1875         rcu_read_lock();
1876         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1877                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1878         rcu_read_unlock();
1879         if (err <= 0)
1880                 goto free;
1881
1882         nf_ct_expect_put(exp);
1883
1884         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1885
1886 free:
1887         kfree_skb(skb2);
1888 out:
1889         nf_ct_expect_put(exp);
1890         return err;
1891 }
1892
1893 static int
1894 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1895                      const struct nlmsghdr *nlh,
1896                      const struct nlattr * const cda[])
1897 {
1898         struct net *net = sock_net(ctnl);
1899         struct nf_conntrack_expect *exp;
1900         struct nf_conntrack_tuple tuple;
1901         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1902         struct hlist_node *n, *next;
1903         u_int8_t u3 = nfmsg->nfgen_family;
1904         unsigned int i;
1905         u16 zone;
1906         int err;
1907
1908         if (cda[CTA_EXPECT_TUPLE]) {
1909                 /* delete a single expect by tuple */
1910                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1911                 if (err < 0)
1912                         return err;
1913
1914                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1915                 if (err < 0)
1916                         return err;
1917
1918                 /* bump usage count to 2 */
1919                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1920                 if (!exp)
1921                         return -ENOENT;
1922
1923                 if (cda[CTA_EXPECT_ID]) {
1924                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1925                         if (ntohl(id) != (u32)(unsigned long)exp) {
1926                                 nf_ct_expect_put(exp);
1927                                 return -ENOENT;
1928                         }
1929                 }
1930
1931                 /* after list removal, usage count == 1 */
1932                 spin_lock_bh(&nf_conntrack_lock);
1933                 if (del_timer(&exp->timeout)) {
1934                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1935                                                    nlmsg_report(nlh));
1936                         nf_ct_expect_put(exp);
1937                 }
1938                 spin_unlock_bh(&nf_conntrack_lock);
1939                 /* have to put what we 'get' above.
1940                  * after this line usage count == 0 */
1941                 nf_ct_expect_put(exp);
1942         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1943                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1944                 struct nf_conn_help *m_help;
1945
1946                 /* delete all expectations for this helper */
1947                 spin_lock_bh(&nf_conntrack_lock);
1948                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1949                         hlist_for_each_entry_safe(exp, n, next,
1950                                                   &net->ct.expect_hash[i],
1951                                                   hnode) {
1952                                 m_help = nfct_help(exp->master);
1953                                 if (!strcmp(m_help->helper->name, name) &&
1954                                     del_timer(&exp->timeout)) {
1955                                         nf_ct_unlink_expect_report(exp,
1956                                                         NETLINK_CB(skb).pid,
1957                                                         nlmsg_report(nlh));
1958                                         nf_ct_expect_put(exp);
1959                                 }
1960                         }
1961                 }
1962                 spin_unlock_bh(&nf_conntrack_lock);
1963         } else {
1964                 /* This basically means we have to flush everything*/
1965                 spin_lock_bh(&nf_conntrack_lock);
1966                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1967                         hlist_for_each_entry_safe(exp, n, next,
1968                                                   &net->ct.expect_hash[i],
1969                                                   hnode) {
1970                                 if (del_timer(&exp->timeout)) {
1971                                         nf_ct_unlink_expect_report(exp,
1972                                                         NETLINK_CB(skb).pid,
1973                                                         nlmsg_report(nlh));
1974                                         nf_ct_expect_put(exp);
1975                                 }
1976                         }
1977                 }
1978                 spin_unlock_bh(&nf_conntrack_lock);
1979         }
1980
1981         return 0;
1982 }
1983 static int
1984 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1985                         const struct nlattr * const cda[])
1986 {
1987         return -EOPNOTSUPP;
1988 }
1989
1990 static int
1991 ctnetlink_create_expect(struct net *net, u16 zone,
1992                         const struct nlattr * const cda[],
1993                         u_int8_t u3,
1994                         u32 pid, int report)
1995 {
1996         struct nf_conntrack_tuple tuple, mask, master_tuple;
1997         struct nf_conntrack_tuple_hash *h = NULL;
1998         struct nf_conntrack_expect *exp;
1999         struct nf_conn *ct;
2000         struct nf_conn_help *help;
2001         int err = 0;
2002
2003         /* caller guarantees that those three CTA_EXPECT_* exist */
2004         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2005         if (err < 0)
2006                 return err;
2007         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2008         if (err < 0)
2009                 return err;
2010         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2011         if (err < 0)
2012                 return err;
2013
2014         /* Look for master conntrack of this expectation */
2015         h = nf_conntrack_find_get(net, zone, &master_tuple);
2016         if (!h)
2017                 return -ENOENT;
2018         ct = nf_ct_tuplehash_to_ctrack(h);
2019         exp = nf_ct_expect_alloc(ct);
2020         if (!exp) {
2021                 err = -ENOMEM;
2022                 goto out;
2023         }
2024         help = nfct_help(ct);
2025         if (!help) {
2026                 if (!cda[CTA_EXPECT_TIMEOUT]) {
2027                         err = -EINVAL;
2028                         goto out;
2029                 }
2030                 exp->timeout.expires =
2031                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2032
2033                 exp->flags = NF_CT_EXPECT_USERSPACE;
2034                 if (cda[CTA_EXPECT_FLAGS]) {
2035                         exp->flags |=
2036                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2037                 }
2038         } else {
2039                 if (cda[CTA_EXPECT_FLAGS]) {
2040                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2041                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2042                 } else
2043                         exp->flags = 0;
2044         }
2045
2046         exp->class = 0;
2047         exp->expectfn = NULL;
2048         exp->master = ct;
2049         exp->helper = NULL;
2050         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2051         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2052         exp->mask.src.u.all = mask.src.u.all;
2053
2054         err = nf_ct_expect_related_report(exp, pid, report);
2055         nf_ct_expect_put(exp);
2056
2057 out:
2058         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2059         return err;
2060 }
2061
2062 static int
2063 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2064                      const struct nlmsghdr *nlh,
2065                      const struct nlattr * const cda[])
2066 {
2067         struct net *net = sock_net(ctnl);
2068         struct nf_conntrack_tuple tuple;
2069         struct nf_conntrack_expect *exp;
2070         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2071         u_int8_t u3 = nfmsg->nfgen_family;
2072         u16 zone;
2073         int err;
2074
2075         if (!cda[CTA_EXPECT_TUPLE]
2076             || !cda[CTA_EXPECT_MASK]
2077             || !cda[CTA_EXPECT_MASTER])
2078                 return -EINVAL;
2079
2080         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2081         if (err < 0)
2082                 return err;
2083
2084         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2085         if (err < 0)
2086                 return err;
2087
2088         spin_lock_bh(&nf_conntrack_lock);
2089         exp = __nf_ct_expect_find(net, zone, &tuple);
2090
2091         if (!exp) {
2092                 spin_unlock_bh(&nf_conntrack_lock);
2093                 err = -ENOENT;
2094                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2095                         err = ctnetlink_create_expect(net, zone, cda,
2096                                                       u3,
2097                                                       NETLINK_CB(skb).pid,
2098                                                       nlmsg_report(nlh));
2099                 }
2100                 return err;
2101         }
2102
2103         err = -EEXIST;
2104         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2105                 err = ctnetlink_change_expect(exp, cda);
2106         spin_unlock_bh(&nf_conntrack_lock);
2107
2108         return err;
2109 }
2110
2111 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2112 static struct nf_ct_event_notifier ctnl_notifier = {
2113         .fcn = ctnetlink_conntrack_event,
2114 };
2115
2116 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2117         .fcn = ctnetlink_expect_event,
2118 };
2119 #endif
2120
2121 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2122         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2123                                             .attr_count = CTA_MAX,
2124                                             .policy = ct_nla_policy },
2125         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2126                                             .attr_count = CTA_MAX,
2127                                             .policy = ct_nla_policy },
2128         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2129                                             .attr_count = CTA_MAX,
2130                                             .policy = ct_nla_policy },
2131         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2132                                             .attr_count = CTA_MAX,
2133                                             .policy = ct_nla_policy },
2134 };
2135
2136 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2137         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2138                                             .attr_count = CTA_EXPECT_MAX,
2139                                             .policy = exp_nla_policy },
2140         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2141                                             .attr_count = CTA_EXPECT_MAX,
2142                                             .policy = exp_nla_policy },
2143         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2144                                             .attr_count = CTA_EXPECT_MAX,
2145                                             .policy = exp_nla_policy },
2146 };
2147
2148 static const struct nfnetlink_subsystem ctnl_subsys = {
2149         .name                           = "conntrack",
2150         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2151         .cb_count                       = IPCTNL_MSG_MAX,
2152         .cb                             = ctnl_cb,
2153 };
2154
2155 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2156         .name                           = "conntrack_expect",
2157         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2158         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2159         .cb                             = ctnl_exp_cb,
2160 };
2161
2162 MODULE_ALIAS("ip_conntrack_netlink");
2163 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2164 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2165
2166 static int __init ctnetlink_init(void)
2167 {
2168         int ret;
2169
2170         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2171         ret = nfnetlink_subsys_register(&ctnl_subsys);
2172         if (ret < 0) {
2173                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2174                 goto err_out;
2175         }
2176
2177         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2178         if (ret < 0) {
2179                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2180                 goto err_unreg_subsys;
2181         }
2182
2183 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2184         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2185         if (ret < 0) {
2186                 pr_err("ctnetlink_init: cannot register notifier.\n");
2187                 goto err_unreg_exp_subsys;
2188         }
2189
2190         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2191         if (ret < 0) {
2192                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2193                 goto err_unreg_notifier;
2194         }
2195 #endif
2196
2197         return 0;
2198
2199 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2200 err_unreg_notifier:
2201         nf_conntrack_unregister_notifier(&ctnl_notifier);
2202 err_unreg_exp_subsys:
2203         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2204 #endif
2205 err_unreg_subsys:
2206         nfnetlink_subsys_unregister(&ctnl_subsys);
2207 err_out:
2208         return ret;
2209 }
2210
2211 static void __exit ctnetlink_exit(void)
2212 {
2213         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2214
2215         nf_ct_remove_userspace_expectations();
2216 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2217         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2218         nf_conntrack_unregister_notifier(&ctnl_notifier);
2219 #endif
2220
2221         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2222         nfnetlink_subsys_unregister(&ctnl_subsys);
2223 }
2224
2225 module_init(ctnetlink_init);
2226 module_exit(ctnetlink_exit);