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
  31 #include <linux/netfilter.h>
  32 #include <net/netlink.h>
  33 #include <net/sock.h>
  34 #include <net/netfilter/nf_conntrack.h>
  35 #include <net/netfilter/nf_conntrack_core.h>
  36 #include <net/netfilter/nf_conntrack_expect.h>
  37 #include <net/netfilter/nf_conntrack_helper.h>
  38 #include <net/netfilter/nf_conntrack_l3proto.h>
  39 #include <net/netfilter/nf_conntrack_l4proto.h>
  40 #include <net/netfilter/nf_conntrack_tuple.h>
  41 #include <net/netfilter/nf_conntrack_acct.h>
  42 #ifdef CONFIG_NF_NAT_NEEDED
  43 #include <net/netfilter/nf_nat_core.h>
  44 #include <net/netfilter/nf_nat_protocol.h>
  45 #endif
  46
  47 #include <linux/netfilter/nfnetlink.h>
  48 #include <linux/netfilter/nfnetlink_conntrack.h>
  49
  50 MODULE_LICENSE("GPL");
  51
  52 static char __initdata version[] = "0.93";
  53
  54 static inline int
  55 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  56                             const struct nf_conntrack_tuple *tuple,
  57                             struct nf_conntrack_l4proto *l4proto)
  58 {
  59         int ret = 0;
  60         struct nlattr *nest_parms;
  61
  62         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  63         if (!nest_parms)
  64                 goto nla_put_failure;
  65         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  66
  67         if (likely(l4proto->tuple_to_nlattr))
  68                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  69
  70         nla_nest_end(skb, nest_parms);
  71
  72         return ret;
  73
  74 nla_put_failure:
  75         return -1;
  76 }
  77
  78 static inline int
  79 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  80                          const struct nf_conntrack_tuple *tuple,
  81                          struct nf_conntrack_l3proto *l3proto)
  82 {
  83         int ret = 0;
  84         struct nlattr *nest_parms;
  85
  86         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  87         if (!nest_parms)
  88                 goto nla_put_failure;
  89
  90         if (likely(l3proto->tuple_to_nlattr))
  91                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  92
  93         nla_nest_end(skb, nest_parms);
  94
  95         return ret;
  96
  97 nla_put_failure:
  98         return -1;
  99 }
 100
 101 static int
 102 ctnetlink_dump_tuples(struct sk_buff *skb,
 103                       const struct nf_conntrack_tuple *tuple)
 104 {
 105         int ret;
 106         struct nf_conntrack_l3proto *l3proto;
 107         struct nf_conntrack_l4proto *l4proto;
 108
 109         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 110         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 111
 112         if (unlikely(ret < 0))
 113                 return ret;
 114
 115         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 116         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 117
 118         return ret;
 119 }
 120
 121 static inline int
 122 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 123 {
 124         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 125         return 0;
 126
 127 nla_put_failure:
 128         return -1;
 129 }
 130
 131 static inline int
 132 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 133 {
 134         long timeout = (ct->timeout.expires - jiffies) / HZ;
 135
 136         if (timeout < 0)
 137                 timeout = 0;
 138
 139         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 140         return 0;
 141
 142 nla_put_failure:
 143         return -1;
 144 }
 145
 146 static inline int
 147 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 148 {
 149         struct nf_conntrack_l4proto *l4proto;
 150         struct nlattr *nest_proto;
 151         int ret;
 152
 153         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 154         if (!l4proto->to_nlattr)
 155                 return 0;
 156
 157         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 158         if (!nest_proto)
 159                 goto nla_put_failure;
 160
 161         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 162
 163         nla_nest_end(skb, nest_proto);
 164
 165         return ret;
 166
 167 nla_put_failure:
 168         return -1;
 169 }
 170
 171 static inline int
 172 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 173 {
 174         struct nlattr *nest_helper;
 175         const struct nf_conn_help *help = nfct_help(ct);
 176         struct nf_conntrack_helper *helper;
 177
 178         if (!help)
 179                 return 0;
 180
 181         helper = rcu_dereference(help->helper);
 182         if (!helper)
 183                 goto out;
 184
 185         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 186         if (!nest_helper)
 187                 goto nla_put_failure;
 188         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 189
 190         if (helper->to_nlattr)
 191                 helper->to_nlattr(skb, ct);
 192
 193         nla_nest_end(skb, nest_helper);
 194 out:
 195         return 0;
 196
 197 nla_put_failure:
 198         return -1;
 199 }
 200
 201 static int
 202 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 203                         enum ip_conntrack_dir dir)
 204 {
 205         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 206         struct nlattr *nest_count;
 207         const struct nf_conn_counter *acct;
 208
 209         acct = nf_conn_acct_find(ct);
 210         if (!acct)
 211                 return 0;
 212
 213         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 214         if (!nest_count)
 215                 goto nla_put_failure;
 216
 217         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 218                      cpu_to_be64(acct[dir].packets));
 219         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 220                      cpu_to_be64(acct[dir].bytes));
 221
 222         nla_nest_end(skb, nest_count);
 223
 224         return 0;
 225
 226 nla_put_failure:
 227         return -1;
 228 }
 229
 230 #ifdef CONFIG_NF_CONNTRACK_MARK
 231 static inline int
 232 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 233 {
 234         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 235         return 0;
 236
 237 nla_put_failure:
 238         return -1;
 239 }
 240 #else
 241 #define ctnetlink_dump_mark(a, b) (0)
 242 #endif
 243
 244 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 245 static inline int
 246 ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 247 {
 248         NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 249         return 0;
 250
 251 nla_put_failure:
 252         return -1;
 253 }
 254 #else
 255 #define ctnetlink_dump_secmark(a, b) (0)
 256 #endif
 257
 258 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 259
 260 static inline int
 261 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 262 {
 263         struct nlattr *nest_parms;
 264
 265         if (!(ct->status & IPS_EXPECTED))
 266                 return 0;
 267
 268         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 269         if (!nest_parms)
 270                 goto nla_put_failure;
 271         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 272                 goto nla_put_failure;
 273         nla_nest_end(skb, nest_parms);
 274
 275         return 0;
 276
 277 nla_put_failure:
 278         return -1;
 279 }
 280
 281 #ifdef CONFIG_NF_NAT_NEEDED
 282 static int
 283 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 284 {
 285         struct nlattr *nest_parms;
 286
 287         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 288         if (!nest_parms)
 289                 goto nla_put_failure;
 290
 291         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 292                      htonl(natseq->correction_pos));
 293         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 294                      htonl(natseq->offset_before));
 295         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 296                      htonl(natseq->offset_after));
 297
 298         nla_nest_end(skb, nest_parms);
 299
 300         return 0;
 301
 302 nla_put_failure:
 303         return -1;
 304 }
 305
 306 static inline int
 307 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 308 {
 309         struct nf_nat_seq *natseq;
 310         struct nf_conn_nat *nat = nfct_nat(ct);
 311
 312         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 313                 return 0;
 314
 315         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 316         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 317                 return -1;
 318
 319         natseq = &nat->seq[IP_CT_DIR_REPLY];
 320         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 321                 return -1;
 322
 323         return 0;
 324 }
 325 #else
 326 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 327 #endif
 328
 329 static inline int
 330 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 331 {
 332         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 333         return 0;
 334
 335 nla_put_failure:
 336         return -1;
 337 }
 338
 339 static inline int
 340 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 341 {
 342         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 343         return 0;
 344
 345 nla_put_failure:
 346         return -1;
 347 }
 348
 349 static int
 350 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 351                     int event, struct nf_conn *ct)
 352 {
 353         struct nlmsghdr *nlh;
 354         struct nfgenmsg *nfmsg;
 355         struct nlattr *nest_parms;
 356         unsigned int flags = pid ? NLM_F_MULTI : 0;
 357
 358         event |= NFNL_SUBSYS_CTNETLINK << 8;
 359         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 360         if (nlh == NULL)
 361                 goto nlmsg_failure;
 362
 363         nfmsg = nlmsg_data(nlh);
 364         nfmsg->nfgen_family = nf_ct_l3num(ct);
 365         nfmsg->version      = NFNETLINK_V0;
 366         nfmsg->res_id       = 0;
 367
 368         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 369         if (!nest_parms)
 370                 goto nla_put_failure;
 371         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 372                 goto nla_put_failure;
 373         nla_nest_end(skb, nest_parms);
 374
 375         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 376         if (!nest_parms)
 377                 goto nla_put_failure;
 378         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 379                 goto nla_put_failure;
 380         nla_nest_end(skb, nest_parms);
 381
 382         if (ctnetlink_dump_status(skb, ct) < 0 ||
 383             ctnetlink_dump_timeout(skb, ct) < 0 ||
 384             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 385             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 386             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 387             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 388             ctnetlink_dump_mark(skb, ct) < 0 ||
 389             ctnetlink_dump_secmark(skb, ct) < 0 ||
 390             ctnetlink_dump_id(skb, ct) < 0 ||
 391             ctnetlink_dump_use(skb, ct) < 0 ||
 392             ctnetlink_dump_master(skb, ct) < 0 ||
 393             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 394                 goto nla_put_failure;
 395
 396         nlmsg_end(skb, nlh);
 397         return skb->len;
 398
 399 nlmsg_failure:
 400 nla_put_failure:
 401         nlmsg_cancel(skb, nlh);
 402         return -1;
 403 }
 404
 405 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 406 static inline size_t
 407 ctnetlink_proto_size(const struct nf_conn *ct)
 408 {
 409         struct nf_conntrack_l3proto *l3proto;
 410         struct nf_conntrack_l4proto *l4proto;
 411         size_t len = 0;
 412
 413         rcu_read_lock();
 414         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 415         len += l3proto->nla_size;
 416
 417         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 418         len += l4proto->nla_size;
 419         rcu_read_unlock();
 420
 421         return len;
 422 }
 423
 424 static inline size_t
 425 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 426 {
 427         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 428                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 429                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 430                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 431                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 432                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 433                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 434 #ifdef CONFIG_NF_CT_ACCT
 435                + 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 436                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 437                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 438 #endif
 439                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 440                + nla_total_size(0) /* CTA_PROTOINFO */
 441                + nla_total_size(0) /* CTA_HELP */
 442                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 443 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 444                + nla_total_size(sizeof(u_int32_t)) /* CTA_SECMARK */
 445 #endif
 446 #ifdef CONFIG_NF_NAT_NEEDED
 447                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 448                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 449 #endif
 450 #ifdef CONFIG_NF_CONNTRACK_MARK
 451                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 452 #endif
 453                + ctnetlink_proto_size(ct)
 454                ;
 455 }
 456
 457 static int
 458 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 459 {
 460         struct net *net;
 461         struct nlmsghdr *nlh;
 462         struct nfgenmsg *nfmsg;
 463         struct nlattr *nest_parms;
 464         struct nf_conn *ct = item->ct;
 465         struct sk_buff *skb;
 466         unsigned int type;
 467         unsigned int flags = 0, group;
 468         int err;
 469
 470         /* ignore our fake conntrack entry */
 471         if (ct == &nf_conntrack_untracked)
 472                 return 0;
 473
 474         if (events & (1 << IPCT_DESTROY)) {
 475                 type = IPCTNL_MSG_CT_DELETE;
 476                 group = NFNLGRP_CONNTRACK_DESTROY;
 477         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 478                 type = IPCTNL_MSG_CT_NEW;
 479                 flags = NLM_F_CREATE|NLM_F_EXCL;
 480                 group = NFNLGRP_CONNTRACK_NEW;
 481         } else  if (events) {
 482                 type = IPCTNL_MSG_CT_NEW;
 483                 group = NFNLGRP_CONNTRACK_UPDATE;
 484         } else
 485                 return 0;
 486
 487         net = nf_ct_net(ct);
 488         if (!item->report && !nfnetlink_has_listeners(net, group))
 489                 return 0;
 490
 491         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 492         if (skb == NULL)
 493                 goto errout;
 494
 495         type |= NFNL_SUBSYS_CTNETLINK << 8;
 496         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 497         if (nlh == NULL)
 498                 goto nlmsg_failure;
 499
 500         nfmsg = nlmsg_data(nlh);
 501         nfmsg->nfgen_family = nf_ct_l3num(ct);
 502         nfmsg->version  = NFNETLINK_V0;
 503         nfmsg->res_id   = 0;
 504
 505         rcu_read_lock();
 506         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 507         if (!nest_parms)
 508                 goto nla_put_failure;
 509         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 510                 goto nla_put_failure;
 511         nla_nest_end(skb, nest_parms);
 512
 513         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 514         if (!nest_parms)
 515                 goto nla_put_failure;
 516         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 517                 goto nla_put_failure;
 518         nla_nest_end(skb, nest_parms);
 519
 520         if (ctnetlink_dump_id(skb, ct) < 0)
 521                 goto nla_put_failure;
 522
 523         if (ctnetlink_dump_status(skb, ct) < 0)
 524                 goto nla_put_failure;
 525
 526         if (events & (1 << IPCT_DESTROY)) {
 527                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 528                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 529                         goto nla_put_failure;
 530         } else {
 531                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 532                         goto nla_put_failure;
 533
 534                 if (events & (1 << IPCT_PROTOINFO)
 535                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 536                         goto nla_put_failure;
 537
 538                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 539                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 540                         goto nla_put_failure;
 541
 542 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 543                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 544                     && ctnetlink_dump_secmark(skb, ct) < 0)
 545                         goto nla_put_failure;
 546 #endif
 547
 548                 if (events & (1 << IPCT_RELATED) &&
 549                     ctnetlink_dump_master(skb, ct) < 0)
 550                         goto nla_put_failure;
 551
 552                 if (events & (1 << IPCT_NATSEQADJ) &&
 553                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 554                         goto nla_put_failure;
 555         }
 556
 557 #ifdef CONFIG_NF_CONNTRACK_MARK
 558         if ((events & (1 << IPCT_MARK) || ct->mark)
 559             && ctnetlink_dump_mark(skb, ct) < 0)
 560                 goto nla_put_failure;
 561 #endif
 562         rcu_read_unlock();
 563
 564         nlmsg_end(skb, nlh);
 565         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 566                              GFP_ATOMIC);
 567         if (err == -ENOBUFS || err == -EAGAIN)
 568                 return -ENOBUFS;
 569
 570         return 0;
 571
 572 nla_put_failure:
 573         rcu_read_unlock();
 574         nlmsg_cancel(skb, nlh);
 575 nlmsg_failure:
 576         kfree_skb(skb);
 577 errout:
 578         nfnetlink_set_err(net, 0, group, -ENOBUFS);
 579         return 0;
 580 }
 581 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 582
 583 static int ctnetlink_done(struct netlink_callback *cb)
 584 {
 585         if (cb->args[1])
 586                 nf_ct_put((struct nf_conn *)cb->args[1]);
 587         return 0;
 588 }
 589
 590 static int
 591 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 592 {
 593         struct net *net = sock_net(skb->sk);
 594         struct nf_conn *ct, *last;
 595         struct nf_conntrack_tuple_hash *h;
 596         struct hlist_nulls_node *n;
 597         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 598         u_int8_t l3proto = nfmsg->nfgen_family;
 599
 600         rcu_read_lock();
 601         last = (struct nf_conn *)cb->args[1];
 602         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 603 restart:
 604                 hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[cb->args[0]],
 605                                          hnnode) {
 606                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 607                                 continue;
 608                         ct = nf_ct_tuplehash_to_ctrack(h);
 609                         if (!atomic_inc_not_zero(&ct->ct_general.use))
 610                                 continue;
 611                         /* Dump entries of a given L3 protocol number.
 612                          * If it is not specified, ie. l3proto == 0,
 613                          * then dump everything. */
 614                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 615                                 goto releasect;
 616                         if (cb->args[1]) {
 617                                 if (ct != last)
 618                                         goto releasect;
 619                                 cb->args[1] = 0;
 620                         }
 621                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 622                                                 cb->nlh->nlmsg_seq,
 623                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 624                                 cb->args[1] = (unsigned long)ct;
 625                                 goto out;
 626                         }
 627
 628                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 629                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 630                                 struct nf_conn_counter *acct;
 631
 632                                 acct = nf_conn_acct_find(ct);
 633                                 if (acct)
 634                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 635                         }
 636 releasect:
 637                 nf_ct_put(ct);
 638                 }
 639                 if (cb->args[1]) {
 640                         cb->args[1] = 0;
 641                         goto restart;
 642                 }
 643         }
 644 out:
 645         rcu_read_unlock();
 646         if (last)
 647                 nf_ct_put(last);
 648
 649         return skb->len;
 650 }
 651
 652 static inline int
 653 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 654 {
 655         struct nlattr *tb[CTA_IP_MAX+1];
 656         struct nf_conntrack_l3proto *l3proto;
 657         int ret = 0;
 658
 659         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 660
 661         rcu_read_lock();
 662         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 663
 664         if (likely(l3proto->nlattr_to_tuple)) {
 665                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 666                                           l3proto->nla_policy);
 667                 if (ret == 0)
 668                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 669         }
 670
 671         rcu_read_unlock();
 672
 673         return ret;
 674 }
 675
 676 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 677         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 678 };
 679
 680 static inline int
 681 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 682                             struct nf_conntrack_tuple *tuple)
 683 {
 684         struct nlattr *tb[CTA_PROTO_MAX+1];
 685         struct nf_conntrack_l4proto *l4proto;
 686         int ret = 0;
 687
 688         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 689         if (ret < 0)
 690                 return ret;
 691
 692         if (!tb[CTA_PROTO_NUM])
 693                 return -EINVAL;
 694         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 695
 696         rcu_read_lock();
 697         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 698
 699         if (likely(l4proto->nlattr_to_tuple)) {
 700                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 701                                           l4proto->nla_policy);
 702                 if (ret == 0)
 703                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 704         }
 705
 706         rcu_read_unlock();
 707
 708         return ret;
 709 }
 710
 711 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 712         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 713         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 714 };
 715
 716 static int
 717 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 718                       struct nf_conntrack_tuple *tuple,
 719                       enum ctattr_tuple type, u_int8_t l3num)
 720 {
 721         struct nlattr *tb[CTA_TUPLE_MAX+1];
 722         int err;
 723
 724         memset(tuple, 0, sizeof(*tuple));
 725
 726         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 727
 728         if (!tb[CTA_TUPLE_IP])
 729                 return -EINVAL;
 730
 731         tuple->src.l3num = l3num;
 732
 733         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 734         if (err < 0)
 735                 return err;
 736
 737         if (!tb[CTA_TUPLE_PROTO])
 738                 return -EINVAL;
 739
 740         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 741         if (err < 0)
 742                 return err;
 743
 744         /* orig and expect tuples get DIR_ORIGINAL */
 745         if (type == CTA_TUPLE_REPLY)
 746                 tuple->dst.dir = IP_CT_DIR_REPLY;
 747         else
 748                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 749
 750         return 0;
 751 }
 752
 753 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 754         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 755 };
 756
 757 static inline int
 758 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 759 {
 760         struct nlattr *tb[CTA_HELP_MAX+1];
 761
 762         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 763
 764         if (!tb[CTA_HELP_NAME])
 765                 return -EINVAL;
 766
 767         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 768
 769         return 0;
 770 }
 771
 772 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 773         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 774         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 775         [CTA_STATUS]            = { .type = NLA_U32 },
 776         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 777         [CTA_HELP]              = { .type = NLA_NESTED },
 778         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 779         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 780         [CTA_MARK]              = { .type = NLA_U32 },
 781         [CTA_ID]                = { .type = NLA_U32 },
 782         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 783         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 784 };
 785
 786 static int
 787 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 788                         const struct nlmsghdr *nlh,
 789                         const struct nlattr * const cda[])
 790 {
 791         struct net *net = sock_net(ctnl);
 792         struct nf_conntrack_tuple_hash *h;
 793         struct nf_conntrack_tuple tuple;
 794         struct nf_conn *ct;
 795         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 796         u_int8_t u3 = nfmsg->nfgen_family;
 797         int err = 0;
 798
 799         if (cda[CTA_TUPLE_ORIG])
 800                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 801         else if (cda[CTA_TUPLE_REPLY])
 802                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 803         else {
 804                 /* Flush the whole table */
 805                 nf_conntrack_flush_report(net,
 806                                          NETLINK_CB(skb).pid,
 807                                          nlmsg_report(nlh));
 808                 return 0;
 809         }
 810
 811         if (err < 0)
 812                 return err;
 813
 814         h = nf_conntrack_find_get(net, &tuple);
 815         if (!h)
 816                 return -ENOENT;
 817
 818         ct = nf_ct_tuplehash_to_ctrack(h);
 819
 820         if (cda[CTA_ID]) {
 821                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 822                 if (id != (u32)(unsigned long)ct) {
 823                         nf_ct_put(ct);
 824                         return -ENOENT;
 825                 }
 826         }
 827
 828         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 829                                       NETLINK_CB(skb).pid,
 830                                       nlmsg_report(nlh)) < 0) {
 831                 nf_ct_delete_from_lists(ct);
 832                 /* we failed to report the event, try later */
 833                 nf_ct_insert_dying_list(ct);
 834                 nf_ct_put(ct);
 835                 return 0;
 836         }
 837
 838         /* death_by_timeout would report the event again */
 839         set_bit(IPS_DYING_BIT, &ct->status);
 840
 841         nf_ct_kill(ct);
 842         nf_ct_put(ct);
 843
 844         return 0;
 845 }
 846
 847 static int
 848 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 849                         const struct nlmsghdr *nlh,
 850                         const struct nlattr * const cda[])
 851 {
 852         struct net *net = sock_net(ctnl);
 853         struct nf_conntrack_tuple_hash *h;
 854         struct nf_conntrack_tuple tuple;
 855         struct nf_conn *ct;
 856         struct sk_buff *skb2 = NULL;
 857         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 858         u_int8_t u3 = nfmsg->nfgen_family;
 859         int err = 0;
 860
 861         if (nlh->nlmsg_flags & NLM_F_DUMP)
 862                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 863                                           ctnetlink_done);
 864
 865         if (cda[CTA_TUPLE_ORIG])
 866                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 867         else if (cda[CTA_TUPLE_REPLY])
 868                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 869         else
 870                 return -EINVAL;
 871
 872         if (err < 0)
 873                 return err;
 874
 875         h = nf_conntrack_find_get(net, &tuple);
 876         if (!h)
 877                 return -ENOENT;
 878
 879         ct = nf_ct_tuplehash_to_ctrack(h);
 880
 881         err = -ENOMEM;
 882         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 883         if (skb2 == NULL) {
 884                 nf_ct_put(ct);
 885                 return -ENOMEM;
 886         }
 887
 888         rcu_read_lock();
 889         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 890                                   IPCTNL_MSG_CT_NEW, ct);
 891         rcu_read_unlock();
 892         nf_ct_put(ct);
 893         if (err <= 0)
 894                 goto free;
 895
 896         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 897         if (err < 0)
 898                 goto out;
 899
 900         return 0;
 901
 902 free:
 903         kfree_skb(skb2);
 904 out:
 905         return err;
 906 }
 907
 908 #ifdef CONFIG_NF_NAT_NEEDED
 909 static int
 910 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 911                           enum nf_nat_manip_type manip,
 912                           const struct nlattr *attr)
 913 {
 914         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 915
 916         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 917         if (!parse_nat_setup) {
 918 #ifdef CONFIG_MODULES
 919                 rcu_read_unlock();
 920                 spin_unlock_bh(&nf_conntrack_lock);
 921                 nfnl_unlock();
 922                 if (request_module("nf-nat-ipv4") < 0) {
 923                         nfnl_lock();
 924                         spin_lock_bh(&nf_conntrack_lock);
 925                         rcu_read_lock();
 926                         return -EOPNOTSUPP;
 927                 }
 928                 nfnl_lock();
 929                 spin_lock_bh(&nf_conntrack_lock);
 930                 rcu_read_lock();
 931                 if (nfnetlink_parse_nat_setup_hook)
 932                         return -EAGAIN;
 933 #endif
 934                 return -EOPNOTSUPP;
 935         }
 936
 937         return parse_nat_setup(ct, manip, attr);
 938 }
 939 #endif
 940
 941 static int
 942 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
 943 {
 944         unsigned long d;
 945         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 946         d = ct->status ^ status;
 947
 948         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 949                 /* unchangeable */
 950                 return -EBUSY;
 951
 952         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 953                 /* SEEN_REPLY bit can only be set */
 954                 return -EBUSY;
 955
 956         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 957                 /* ASSURED bit can only be set */
 958                 return -EBUSY;
 959
 960         /* Be careful here, modifying NAT bits can screw up things,
 961          * so don't let users modify them directly if they don't pass
 962          * nf_nat_range. */
 963         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 964         return 0;
 965 }
 966
 967 static int
 968 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
 969 {
 970 #ifdef CONFIG_NF_NAT_NEEDED
 971         int ret;
 972
 973         if (cda[CTA_NAT_DST]) {
 974                 ret = ctnetlink_parse_nat_setup(ct,
 975                                                 IP_NAT_MANIP_DST,
 976                                                 cda[CTA_NAT_DST]);
 977                 if (ret < 0)
 978                         return ret;
 979         }
 980         if (cda[CTA_NAT_SRC]) {
 981                 ret = ctnetlink_parse_nat_setup(ct,
 982                                                 IP_NAT_MANIP_SRC,
 983                                                 cda[CTA_NAT_SRC]);
 984                 if (ret < 0)
 985                         return ret;
 986         }
 987         return 0;
 988 #else
 989         return -EOPNOTSUPP;
 990 #endif
 991 }
 992
 993 static inline int
 994 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
 995 {
 996         struct nf_conntrack_helper *helper;
 997         struct nf_conn_help *help = nfct_help(ct);
 998         char *helpname = NULL;
 999         int err;
1000
1001         /* don't change helper of sibling connections */
1002         if (ct->master)
1003                 return -EBUSY;
1004
1005         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1006         if (err < 0)
1007                 return err;
1008
1009         if (!strcmp(helpname, "")) {
1010                 if (help && help->helper) {
1011                         /* we had a helper before ... */
1012                         nf_ct_remove_expectations(ct);
1013                         rcu_assign_pointer(help->helper, NULL);
1014                 }
1015
1016                 return 0;
1017         }
1018
1019         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1020                                             nf_ct_protonum(ct));
1021         if (helper == NULL) {
1022 #ifdef CONFIG_MODULES
1023                 spin_unlock_bh(&nf_conntrack_lock);
1024
1025                 if (request_module("nfct-helper-%s", helpname) < 0) {
1026                         spin_lock_bh(&nf_conntrack_lock);
1027                         return -EOPNOTSUPP;
1028                 }
1029
1030                 spin_lock_bh(&nf_conntrack_lock);
1031                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1032                                                     nf_ct_protonum(ct));
1033                 if (helper)
1034                         return -EAGAIN;
1035 #endif
1036                 return -EOPNOTSUPP;
1037         }
1038
1039         if (help) {
1040                 if (help->helper == helper)
1041                         return 0;
1042                 if (help->helper)
1043                         return -EBUSY;
1044                 /* need to zero data of old helper */
1045                 memset(&help->help, 0, sizeof(help->help));
1046         } else {
1047                 help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1048                 if (help == NULL)
1049                         return -ENOMEM;
1050         }
1051
1052         rcu_assign_pointer(help->helper, helper);
1053
1054         return 0;
1055 }
1056
1057 static inline int
1058 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1059 {
1060         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1061
1062         if (!del_timer(&ct->timeout))
1063                 return -ETIME;
1064
1065         ct->timeout.expires = jiffies + timeout * HZ;
1066         add_timer(&ct->timeout);
1067
1068         return 0;
1069 }
1070
1071 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1072         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1073         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1074         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1075 };
1076
1077 static inline int
1078 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1079 {
1080         const struct nlattr *attr = cda[CTA_PROTOINFO];
1081         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1082         struct nf_conntrack_l4proto *l4proto;
1083         int err = 0;
1084
1085         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1086
1087         rcu_read_lock();
1088         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1089         if (l4proto->from_nlattr)
1090                 err = l4proto->from_nlattr(tb, ct);
1091         rcu_read_unlock();
1092
1093         return err;
1094 }
1095
1096 #ifdef CONFIG_NF_NAT_NEEDED
1097 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1098         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1099         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1100         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1101 };
1102
1103 static inline int
1104 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1105 {
1106         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1107
1108         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1109
1110         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1111                 return -EINVAL;
1112
1113         natseq->correction_pos =
1114                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1115
1116         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1117                 return -EINVAL;
1118
1119         natseq->offset_before =
1120                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1121
1122         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1123                 return -EINVAL;
1124
1125         natseq->offset_after =
1126                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1127
1128         return 0;
1129 }
1130
1131 static int
1132 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1133                              const struct nlattr * const cda[])
1134 {
1135         int ret = 0;
1136         struct nf_conn_nat *nat = nfct_nat(ct);
1137
1138         if (!nat)
1139                 return 0;
1140
1141         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1142                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1143                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1144                 if (ret < 0)
1145                         return ret;
1146
1147                 ct->status |= IPS_SEQ_ADJUST;
1148         }
1149
1150         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1151                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1152                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1153                 if (ret < 0)
1154                         return ret;
1155
1156                 ct->status |= IPS_SEQ_ADJUST;
1157         }
1158
1159         return 0;
1160 }
1161 #endif
1162
1163 static int
1164 ctnetlink_change_conntrack(struct nf_conn *ct,
1165                            const struct nlattr * const cda[])
1166 {
1167         int err;
1168
1169         /* only allow NAT changes and master assignation for new conntracks */
1170         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1171                 return -EOPNOTSUPP;
1172
1173         if (cda[CTA_HELP]) {
1174                 err = ctnetlink_change_helper(ct, cda);
1175                 if (err < 0)
1176                         return err;
1177         }
1178
1179         if (cda[CTA_TIMEOUT]) {
1180                 err = ctnetlink_change_timeout(ct, cda);
1181                 if (err < 0)
1182                         return err;
1183         }
1184
1185         if (cda[CTA_STATUS]) {
1186                 err = ctnetlink_change_status(ct, cda);
1187                 if (err < 0)
1188                         return err;
1189         }
1190
1191         if (cda[CTA_PROTOINFO]) {
1192                 err = ctnetlink_change_protoinfo(ct, cda);
1193                 if (err < 0)
1194                         return err;
1195         }
1196
1197 #if defined(CONFIG_NF_CONNTRACK_MARK)
1198         if (cda[CTA_MARK])
1199                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1200 #endif
1201
1202 #ifdef CONFIG_NF_NAT_NEEDED
1203         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1204                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1205                 if (err < 0)
1206                         return err;
1207         }
1208 #endif
1209
1210         return 0;
1211 }
1212
1213 static struct nf_conn *
1214 ctnetlink_create_conntrack(struct net *net,
1215                            const struct nlattr * const cda[],
1216                            struct nf_conntrack_tuple *otuple,
1217                            struct nf_conntrack_tuple *rtuple,
1218                            u8 u3)
1219 {
1220         struct nf_conn *ct;
1221         int err = -EINVAL;
1222         struct nf_conntrack_helper *helper;
1223
1224         ct = nf_conntrack_alloc(net, otuple, rtuple, GFP_ATOMIC);
1225         if (IS_ERR(ct))
1226                 return ERR_PTR(-ENOMEM);
1227
1228         if (!cda[CTA_TIMEOUT])
1229                 goto err1;
1230         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1231
1232         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1233         ct->status |= IPS_CONFIRMED;
1234
1235         rcu_read_lock();
1236         if (cda[CTA_HELP]) {
1237                 char *helpname = NULL;
1238
1239                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1240                 if (err < 0)
1241                         goto err2;
1242
1243                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1244                                                     nf_ct_protonum(ct));
1245                 if (helper == NULL) {
1246                         rcu_read_unlock();
1247 #ifdef CONFIG_MODULES
1248                         if (request_module("nfct-helper-%s", helpname) < 0) {
1249                                 err = -EOPNOTSUPP;
1250                                 goto err1;
1251                         }
1252
1253                         rcu_read_lock();
1254                         helper = __nf_conntrack_helper_find(helpname,
1255                                                             nf_ct_l3num(ct),
1256                                                             nf_ct_protonum(ct));
1257                         if (helper) {
1258                                 err = -EAGAIN;
1259                                 goto err2;
1260                         }
1261                         rcu_read_unlock();
1262 #endif
1263                         err = -EOPNOTSUPP;
1264                         goto err1;
1265                 } else {
1266                         struct nf_conn_help *help;
1267
1268                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1269                         if (help == NULL) {
1270                                 err = -ENOMEM;
1271                                 goto err2;
1272                         }
1273
1274                         /* not in hash table yet so not strictly necessary */
1275                         rcu_assign_pointer(help->helper, helper);
1276                 }
1277         } else {
1278                 /* try an implicit helper assignation */
1279                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1280                 if (err < 0)
1281                         goto err2;
1282         }
1283
1284         if (cda[CTA_STATUS]) {
1285                 err = ctnetlink_change_status(ct, cda);
1286                 if (err < 0)
1287                         goto err2;
1288         }
1289
1290         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1291                 err = ctnetlink_change_nat(ct, cda);
1292                 if (err < 0)
1293                         goto err2;
1294         }
1295
1296 #ifdef CONFIG_NF_NAT_NEEDED
1297         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1298                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1299                 if (err < 0)
1300                         goto err2;
1301         }
1302 #endif
1303
1304         if (cda[CTA_PROTOINFO]) {
1305                 err = ctnetlink_change_protoinfo(ct, cda);
1306                 if (err < 0)
1307                         goto err2;
1308         }
1309
1310         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1311         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1312
1313 #if defined(CONFIG_NF_CONNTRACK_MARK)
1314         if (cda[CTA_MARK])
1315                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1316 #endif
1317
1318         /* setup master conntrack: this is a confirmed expectation */
1319         if (cda[CTA_TUPLE_MASTER]) {
1320                 struct nf_conntrack_tuple master;
1321                 struct nf_conntrack_tuple_hash *master_h;
1322                 struct nf_conn *master_ct;
1323
1324                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1325                 if (err < 0)
1326                         goto err2;
1327
1328                 master_h = nf_conntrack_find_get(net, &master);
1329                 if (master_h == NULL) {
1330                         err = -ENOENT;
1331                         goto err2;
1332                 }
1333                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1334                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1335                 ct->master = master_ct;
1336         }
1337
1338         add_timer(&ct->timeout);
1339         nf_conntrack_hash_insert(ct);
1340         rcu_read_unlock();
1341
1342         return ct;
1343
1344 err2:
1345         rcu_read_unlock();
1346 err1:
1347         nf_conntrack_free(ct);
1348         return ERR_PTR(err);
1349 }
1350
1351 static int
1352 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1353                         const struct nlmsghdr *nlh,
1354                         const struct nlattr * const cda[])
1355 {
1356         struct net *net = sock_net(ctnl);
1357         struct nf_conntrack_tuple otuple, rtuple;
1358         struct nf_conntrack_tuple_hash *h = NULL;
1359         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1360         u_int8_t u3 = nfmsg->nfgen_family;
1361         int err = 0;
1362
1363         if (cda[CTA_TUPLE_ORIG]) {
1364                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1365                 if (err < 0)
1366                         return err;
1367         }
1368
1369         if (cda[CTA_TUPLE_REPLY]) {
1370                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1371                 if (err < 0)
1372                         return err;
1373         }
1374
1375         spin_lock_bh(&nf_conntrack_lock);
1376         if (cda[CTA_TUPLE_ORIG])
1377                 h = __nf_conntrack_find(net, &otuple);
1378         else if (cda[CTA_TUPLE_REPLY])
1379                 h = __nf_conntrack_find(net, &rtuple);
1380
1381         if (h == NULL) {
1382                 err = -ENOENT;
1383                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1384                         struct nf_conn *ct;
1385                         enum ip_conntrack_events events;
1386
1387                         ct = ctnetlink_create_conntrack(net, cda, &otuple,
1388                                                         &rtuple, u3);
1389                         if (IS_ERR(ct)) {
1390                                 err = PTR_ERR(ct);
1391                                 goto out_unlock;
1392                         }
1393                         err = 0;
1394                         nf_conntrack_get(&ct->ct_general);
1395                         spin_unlock_bh(&nf_conntrack_lock);
1396                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1397                                 events = IPCT_RELATED;
1398                         else
1399                                 events = IPCT_NEW;
1400
1401                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1402                                                       (1 << IPCT_ASSURED) |
1403                                                       (1 << IPCT_HELPER) |
1404                                                       (1 << IPCT_PROTOINFO) |
1405                                                       (1 << IPCT_NATSEQADJ) |
1406                                                       (1 << IPCT_MARK) | events,
1407                                                       ct, NETLINK_CB(skb).pid,
1408                                                       nlmsg_report(nlh));
1409                         nf_ct_put(ct);
1410                 } else
1411                         spin_unlock_bh(&nf_conntrack_lock);
1412
1413                 return err;
1414         }
1415         /* implicit 'else' */
1416
1417         /* We manipulate the conntrack inside the global conntrack table lock,
1418          * so there's no need to increase the refcount */
1419         err = -EEXIST;
1420         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1421                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1422
1423                 err = ctnetlink_change_conntrack(ct, cda);
1424                 if (err == 0) {
1425                         nf_conntrack_get(&ct->ct_general);
1426                         spin_unlock_bh(&nf_conntrack_lock);
1427                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1428                                                       (1 << IPCT_ASSURED) |
1429                                                       (1 << IPCT_HELPER) |
1430                                                       (1 << IPCT_PROTOINFO) |
1431                                                       (1 << IPCT_NATSEQADJ) |
1432                                                       (1 << IPCT_MARK),
1433                                                       ct, NETLINK_CB(skb).pid,
1434                                                       nlmsg_report(nlh));
1435                         nf_ct_put(ct);
1436                 } else
1437                         spin_unlock_bh(&nf_conntrack_lock);
1438
1439                 return err;
1440         }
1441
1442 out_unlock:
1443         spin_unlock_bh(&nf_conntrack_lock);
1444         return err;
1445 }
1446
1447 /***********************************************************************
1448  * EXPECT
1449  ***********************************************************************/
1450
1451 static inline int
1452 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1453                          const struct nf_conntrack_tuple *tuple,
1454                          enum ctattr_expect type)
1455 {
1456         struct nlattr *nest_parms;
1457
1458         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1459         if (!nest_parms)
1460                 goto nla_put_failure;
1461         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1462                 goto nla_put_failure;
1463         nla_nest_end(skb, nest_parms);
1464
1465         return 0;
1466
1467 nla_put_failure:
1468         return -1;
1469 }
1470
1471 static inline int
1472 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1473                         const struct nf_conntrack_tuple *tuple,
1474                         const struct nf_conntrack_tuple_mask *mask)
1475 {
1476         int ret;
1477         struct nf_conntrack_l3proto *l3proto;
1478         struct nf_conntrack_l4proto *l4proto;
1479         struct nf_conntrack_tuple m;
1480         struct nlattr *nest_parms;
1481
1482         memset(&m, 0xFF, sizeof(m));
1483         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1484         m.src.u.all = mask->src.u.all;
1485         m.dst.protonum = tuple->dst.protonum;
1486
1487         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1488         if (!nest_parms)
1489                 goto nla_put_failure;
1490
1491         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1492         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1493
1494         if (unlikely(ret < 0))
1495                 goto nla_put_failure;
1496
1497         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1498         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1499         if (unlikely(ret < 0))
1500                 goto nla_put_failure;
1501
1502         nla_nest_end(skb, nest_parms);
1503
1504         return 0;
1505
1506 nla_put_failure:
1507         return -1;
1508 }
1509
1510 static int
1511 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1512                           const struct nf_conntrack_expect *exp)
1513 {
1514         struct nf_conn *master = exp->master;
1515         long timeout = (exp->timeout.expires - jiffies) / HZ;
1516
1517         if (timeout < 0)
1518                 timeout = 0;
1519
1520         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1521                 goto nla_put_failure;
1522         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1523                 goto nla_put_failure;
1524         if (ctnetlink_exp_dump_tuple(skb,
1525                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1526                                  CTA_EXPECT_MASTER) < 0)
1527                 goto nla_put_failure;
1528
1529         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1530         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1531
1532         return 0;
1533
1534 nla_put_failure:
1535         return -1;
1536 }
1537
1538 static int
1539 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1540                         int event, const struct nf_conntrack_expect *exp)
1541 {
1542         struct nlmsghdr *nlh;
1543         struct nfgenmsg *nfmsg;
1544         unsigned int flags = pid ? NLM_F_MULTI : 0;
1545
1546         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1547         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1548         if (nlh == NULL)
1549                 goto nlmsg_failure;
1550
1551         nfmsg = nlmsg_data(nlh);
1552         nfmsg->nfgen_family = exp->tuple.src.l3num;
1553         nfmsg->version      = NFNETLINK_V0;
1554         nfmsg->res_id       = 0;
1555
1556         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1557                 goto nla_put_failure;
1558
1559         nlmsg_end(skb, nlh);
1560         return skb->len;
1561
1562 nlmsg_failure:
1563 nla_put_failure:
1564         nlmsg_cancel(skb, nlh);
1565         return -1;
1566 }
1567
1568 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1569 static int
1570 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1571 {
1572         struct nf_conntrack_expect *exp = item->exp;
1573         struct net *net = nf_ct_exp_net(exp);
1574         struct nlmsghdr *nlh;
1575         struct nfgenmsg *nfmsg;
1576         struct sk_buff *skb;
1577         unsigned int type;
1578         int flags = 0;
1579
1580         if (events & (1 << IPEXP_NEW)) {
1581                 type = IPCTNL_MSG_EXP_NEW;
1582                 flags = NLM_F_CREATE|NLM_F_EXCL;
1583         } else
1584                 return 0;
1585
1586         if (!item->report &&
1587             !nfnetlink_has_listeners(net, NFNLGRP_CONNTRACK_EXP_NEW))
1588                 return 0;
1589
1590         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1591         if (skb == NULL)
1592                 goto errout;
1593
1594         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1595         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1596         if (nlh == NULL)
1597                 goto nlmsg_failure;
1598
1599         nfmsg = nlmsg_data(nlh);
1600         nfmsg->nfgen_family = exp->tuple.src.l3num;
1601         nfmsg->version      = NFNETLINK_V0;
1602         nfmsg->res_id       = 0;
1603
1604         rcu_read_lock();
1605         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1606                 goto nla_put_failure;
1607         rcu_read_unlock();
1608
1609         nlmsg_end(skb, nlh);
1610         nfnetlink_send(skb, net, item->pid, NFNLGRP_CONNTRACK_EXP_NEW,
1611                        item->report, GFP_ATOMIC);
1612         return 0;
1613
1614 nla_put_failure:
1615         rcu_read_unlock();
1616         nlmsg_cancel(skb, nlh);
1617 nlmsg_failure:
1618         kfree_skb(skb);
1619 errout:
1620         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1621         return 0;
1622 }
1623 #endif
1624 static int ctnetlink_exp_done(struct netlink_callback *cb)
1625 {
1626         if (cb->args[1])
1627                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1628         return 0;
1629 }
1630
1631 static int
1632 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1633 {
1634         struct net *net = sock_net(skb->sk);
1635         struct nf_conntrack_expect *exp, *last;
1636         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1637         struct hlist_node *n;
1638         u_int8_t l3proto = nfmsg->nfgen_family;
1639
1640         rcu_read_lock();
1641         last = (struct nf_conntrack_expect *)cb->args[1];
1642         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1643 restart:
1644                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1645                                      hnode) {
1646                         if (l3proto && exp->tuple.src.l3num != l3proto)
1647                                 continue;
1648                         if (cb->args[1]) {
1649                                 if (exp != last)
1650                                         continue;
1651                                 cb->args[1] = 0;
1652                         }
1653                         if (ctnetlink_exp_fill_info(skb,
1654                                                     NETLINK_CB(cb->skb).pid,
1655                                                     cb->nlh->nlmsg_seq,
1656                                                     IPCTNL_MSG_EXP_NEW,
1657                                                     exp) < 0) {
1658                                 if (!atomic_inc_not_zero(&exp->use))
1659                                         continue;
1660                                 cb->args[1] = (unsigned long)exp;
1661                                 goto out;
1662                         }
1663                 }
1664                 if (cb->args[1]) {
1665                         cb->args[1] = 0;
1666                         goto restart;
1667                 }
1668         }
1669 out:
1670         rcu_read_unlock();
1671         if (last)
1672                 nf_ct_expect_put(last);
1673
1674         return skb->len;
1675 }
1676
1677 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1678         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1679         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1680         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1681         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1682         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1683         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1684 };
1685
1686 static int
1687 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1688                      const struct nlmsghdr *nlh,
1689                      const struct nlattr * const cda[])
1690 {
1691         struct net *net = sock_net(ctnl);
1692         struct nf_conntrack_tuple tuple;
1693         struct nf_conntrack_expect *exp;
1694         struct sk_buff *skb2;
1695         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1696         u_int8_t u3 = nfmsg->nfgen_family;
1697         int err = 0;
1698
1699         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1700                 return netlink_dump_start(ctnl, skb, nlh,
1701                                           ctnetlink_exp_dump_table,
1702                                           ctnetlink_exp_done);
1703         }
1704
1705         if (cda[CTA_EXPECT_MASTER])
1706                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1707         else
1708                 return -EINVAL;
1709
1710         if (err < 0)
1711                 return err;
1712
1713         exp = nf_ct_expect_find_get(net, &tuple);
1714         if (!exp)
1715                 return -ENOENT;
1716
1717         if (cda[CTA_EXPECT_ID]) {
1718                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1719                 if (ntohl(id) != (u32)(unsigned long)exp) {
1720                         nf_ct_expect_put(exp);
1721                         return -ENOENT;
1722                 }
1723         }
1724
1725         err = -ENOMEM;
1726         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1727         if (skb2 == NULL)
1728                 goto out;
1729
1730         rcu_read_lock();
1731         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1732                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1733         rcu_read_unlock();
1734         if (err <= 0)
1735                 goto free;
1736
1737         nf_ct_expect_put(exp);
1738
1739         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1740
1741 free:
1742         kfree_skb(skb2);
1743 out:
1744         nf_ct_expect_put(exp);
1745         return err;
1746 }
1747
1748 static int
1749 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1750                      const struct nlmsghdr *nlh,
1751                      const struct nlattr * const cda[])
1752 {
1753         struct net *net = sock_net(ctnl);
1754         struct nf_conntrack_expect *exp;
1755         struct nf_conntrack_tuple tuple;
1756         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1757         struct hlist_node *n, *next;
1758         u_int8_t u3 = nfmsg->nfgen_family;
1759         unsigned int i;
1760         int err;
1761
1762         if (cda[CTA_EXPECT_TUPLE]) {
1763                 /* delete a single expect by tuple */
1764                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1765                 if (err < 0)
1766                         return err;
1767
1768                 /* bump usage count to 2 */
1769                 exp = nf_ct_expect_find_get(net, &tuple);
1770                 if (!exp)
1771                         return -ENOENT;
1772
1773                 if (cda[CTA_EXPECT_ID]) {
1774                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1775                         if (ntohl(id) != (u32)(unsigned long)exp) {
1776                                 nf_ct_expect_put(exp);
1777                                 return -ENOENT;
1778                         }
1779                 }
1780
1781                 /* after list removal, usage count == 1 */
1782                 nf_ct_unexpect_related(exp);
1783                 /* have to put what we 'get' above.
1784                  * after this line usage count == 0 */
1785                 nf_ct_expect_put(exp);
1786         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1787                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1788                 struct nf_conn_help *m_help;
1789
1790                 /* delete all expectations for this helper */
1791                 spin_lock_bh(&nf_conntrack_lock);
1792                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1793                         hlist_for_each_entry_safe(exp, n, next,
1794                                                   &net->ct.expect_hash[i],
1795                                                   hnode) {
1796                                 m_help = nfct_help(exp->master);
1797                                 if (!strcmp(m_help->helper->name, name) &&
1798                                     del_timer(&exp->timeout)) {
1799                                         nf_ct_unlink_expect(exp);
1800                                         nf_ct_expect_put(exp);
1801                                 }
1802                         }
1803                 }
1804                 spin_unlock_bh(&nf_conntrack_lock);
1805         } else {
1806                 /* This basically means we have to flush everything*/
1807                 spin_lock_bh(&nf_conntrack_lock);
1808                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1809                         hlist_for_each_entry_safe(exp, n, next,
1810                                                   &net->ct.expect_hash[i],
1811                                                   hnode) {
1812                                 if (del_timer(&exp->timeout)) {
1813                                         nf_ct_unlink_expect(exp);
1814                                         nf_ct_expect_put(exp);
1815                                 }
1816                         }
1817                 }
1818                 spin_unlock_bh(&nf_conntrack_lock);
1819         }
1820
1821         return 0;
1822 }
1823 static int
1824 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1825                         const struct nlattr * const cda[])
1826 {
1827         return -EOPNOTSUPP;
1828 }
1829
1830 static int
1831 ctnetlink_create_expect(struct net *net, const struct nlattr * const cda[],
1832                         u_int8_t u3,
1833                         u32 pid, int report)
1834 {
1835         struct nf_conntrack_tuple tuple, mask, master_tuple;
1836         struct nf_conntrack_tuple_hash *h = NULL;
1837         struct nf_conntrack_expect *exp;
1838         struct nf_conn *ct;
1839         struct nf_conn_help *help;
1840         int err = 0;
1841
1842         /* caller guarantees that those three CTA_EXPECT_* exist */
1843         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1844         if (err < 0)
1845                 return err;
1846         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1847         if (err < 0)
1848                 return err;
1849         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1850         if (err < 0)
1851                 return err;
1852
1853         /* Look for master conntrack of this expectation */
1854         h = nf_conntrack_find_get(net, &master_tuple);
1855         if (!h)
1856                 return -ENOENT;
1857         ct = nf_ct_tuplehash_to_ctrack(h);
1858         help = nfct_help(ct);
1859
1860         if (!help || !help->helper) {
1861                 /* such conntrack hasn't got any helper, abort */
1862                 err = -EOPNOTSUPP;
1863                 goto out;
1864         }
1865
1866         exp = nf_ct_expect_alloc(ct);
1867         if (!exp) {
1868                 err = -ENOMEM;
1869                 goto out;
1870         }
1871
1872         exp->class = 0;
1873         exp->expectfn = NULL;
1874         exp->flags = 0;
1875         exp->master = ct;
1876         exp->helper = NULL;
1877         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1878         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1879         exp->mask.src.u.all = mask.src.u.all;
1880
1881         err = nf_ct_expect_related_report(exp, pid, report);
1882         nf_ct_expect_put(exp);
1883
1884 out:
1885         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1886         return err;
1887 }
1888
1889 static int
1890 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1891                      const struct nlmsghdr *nlh,
1892                      const struct nlattr * const cda[])
1893 {
1894         struct net *net = sock_net(ctnl);
1895         struct nf_conntrack_tuple tuple;
1896         struct nf_conntrack_expect *exp;
1897         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1898         u_int8_t u3 = nfmsg->nfgen_family;
1899         int err = 0;
1900
1901         if (!cda[CTA_EXPECT_TUPLE]
1902             || !cda[CTA_EXPECT_MASK]
1903             || !cda[CTA_EXPECT_MASTER])
1904                 return -EINVAL;
1905
1906         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1907         if (err < 0)
1908                 return err;
1909
1910         spin_lock_bh(&nf_conntrack_lock);
1911         exp = __nf_ct_expect_find(net, &tuple);
1912
1913         if (!exp) {
1914                 spin_unlock_bh(&nf_conntrack_lock);
1915                 err = -ENOENT;
1916                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1917                         err = ctnetlink_create_expect(net, cda,
1918                                                       u3,
1919                                                       NETLINK_CB(skb).pid,
1920                                                       nlmsg_report(nlh));
1921                 }
1922                 return err;
1923         }
1924
1925         err = -EEXIST;
1926         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1927                 err = ctnetlink_change_expect(exp, cda);
1928         spin_unlock_bh(&nf_conntrack_lock);
1929
1930         return err;
1931 }
1932
1933 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1934 static struct nf_ct_event_notifier ctnl_notifier = {
1935         .fcn = ctnetlink_conntrack_event,
1936 };
1937
1938 static struct nf_exp_event_notifier ctnl_notifier_exp = {
1939         .fcn = ctnetlink_expect_event,
1940 };
1941 #endif
1942
1943 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1944         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1945                                             .attr_count = CTA_MAX,
1946                                             .policy = ct_nla_policy },
1947         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1948                                             .attr_count = CTA_MAX,
1949                                             .policy = ct_nla_policy },
1950         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1951                                             .attr_count = CTA_MAX,
1952                                             .policy = ct_nla_policy },
1953         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1954                                             .attr_count = CTA_MAX,
1955                                             .policy = ct_nla_policy },
1956 };
1957
1958 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1959         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1960                                             .attr_count = CTA_EXPECT_MAX,
1961                                             .policy = exp_nla_policy },
1962         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1963                                             .attr_count = CTA_EXPECT_MAX,
1964                                             .policy = exp_nla_policy },
1965         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1966                                             .attr_count = CTA_EXPECT_MAX,
1967                                             .policy = exp_nla_policy },
1968 };
1969
1970 static const struct nfnetlink_subsystem ctnl_subsys = {
1971         .name                           = "conntrack",
1972         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1973         .cb_count                       = IPCTNL_MSG_MAX,
1974         .cb                             = ctnl_cb,
1975 };
1976
1977 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1978         .name                           = "conntrack_expect",
1979         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1980         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1981         .cb                             = ctnl_exp_cb,
1982 };
1983
1984 MODULE_ALIAS("ip_conntrack_netlink");
1985 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1986 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1987
1988 static int __init ctnetlink_init(void)
1989 {
1990         int ret;
1991
1992         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1993         ret = nfnetlink_subsys_register(&ctnl_subsys);
1994         if (ret < 0) {
1995                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1996                 goto err_out;
1997         }
1998
1999         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2000         if (ret < 0) {
2001                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
2002                 goto err_unreg_subsys;
2003         }
2004
2005 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2006         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2007         if (ret < 0) {
2008                 printk("ctnetlink_init: cannot register notifier.\n");
2009                 goto err_unreg_exp_subsys;
2010         }
2011
2012         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2013         if (ret < 0) {
2014                 printk("ctnetlink_init: cannot expect register notifier.\n");
2015                 goto err_unreg_notifier;
2016         }
2017 #endif
2018
2019         return 0;
2020
2021 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2022 err_unreg_notifier:
2023         nf_conntrack_unregister_notifier(&ctnl_notifier);
2024 err_unreg_exp_subsys:
2025         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2026 #endif
2027 err_unreg_subsys:
2028         nfnetlink_subsys_unregister(&ctnl_subsys);
2029 err_out:
2030         return ret;
2031 }
2032
2033 static void __exit ctnetlink_exit(void)
2034 {
2035         printk("ctnetlink: unregistering from nfnetlink.\n");
2036
2037 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2038         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2039         nf_conntrack_unregister_notifier(&ctnl_notifier);
2040 #endif
2041
2042         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2043         nfnetlink_subsys_unregister(&ctnl_subsys);
2044         return;
2045 }
2046
2047 module_init(ctnetlink_init);
2048 module_exit(ctnetlink_exit);