git.oblomov.eu Git - linux-2.6/blob - net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2007 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/types.h>
  22 #include <linux/timer.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/errno.h>
  25 #include <linux/netlink.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/notifier.h>
  29
  30 #include <linux/netfilter.h>
  31 #include <net/netlink.h>
  32 #include <net/netfilter/nf_conntrack.h>
  33 #include <net/netfilter/nf_conntrack_core.h>
  34 #include <net/netfilter/nf_conntrack_expect.h>
  35 #include <net/netfilter/nf_conntrack_helper.h>
  36 #include <net/netfilter/nf_conntrack_l3proto.h>
  37 #include <net/netfilter/nf_conntrack_l4proto.h>
  38 #include <net/netfilter/nf_conntrack_tuple.h>
  39 #ifdef CONFIG_NF_NAT_NEEDED
  40 #include <net/netfilter/nf_nat_core.h>
  41 #include <net/netfilter/nf_nat_protocol.h>
  42 #endif
  43
  44 #include <linux/netfilter/nfnetlink.h>
  45 #include <linux/netfilter/nfnetlink_conntrack.h>
  46
  47 MODULE_LICENSE("GPL");
  48
  49 static char __initdata version[] = "0.93";
  50
  51 static inline int
  52 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  53                             const struct nf_conntrack_tuple *tuple,
  54                             struct nf_conntrack_l4proto *l4proto)
  55 {
  56         int ret = 0;
  57         struct nlattr *nest_parms;
  58
  59         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  60         if (!nest_parms)
  61                 goto nla_put_failure;
  62         NLA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
  63
  64         if (likely(l4proto->tuple_to_nlattr))
  65                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  66
  67         nla_nest_end(skb, nest_parms);
  68
  69         return ret;
  70
  71 nla_put_failure:
  72         return -1;
  73 }
  74
  75 static inline int
  76 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  77                          const struct nf_conntrack_tuple *tuple,
  78                          struct nf_conntrack_l3proto *l3proto)
  79 {
  80         int ret = 0;
  81         struct nlattr *nest_parms;
  82
  83         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  84         if (!nest_parms)
  85                 goto nla_put_failure;
  86
  87         if (likely(l3proto->tuple_to_nlattr))
  88                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  89
  90         nla_nest_end(skb, nest_parms);
  91
  92         return ret;
  93
  94 nla_put_failure:
  95         return -1;
  96 }
  97
  98 static inline int
  99 ctnetlink_dump_tuples(struct sk_buff *skb,
 100                       const struct nf_conntrack_tuple *tuple)
 101 {
 102         int ret;
 103         struct nf_conntrack_l3proto *l3proto;
 104         struct nf_conntrack_l4proto *l4proto;
 105
 106         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 107         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 108         nf_ct_l3proto_put(l3proto);
 109
 110         if (unlikely(ret < 0))
 111                 return ret;
 112
 113         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 114         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 115         nf_ct_l4proto_put(l4proto);
 116
 117         return ret;
 118 }
 119
 120 static inline int
 121 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 122 {
 123         __be32 status = htonl((u_int32_t) ct->status);
 124         NLA_PUT(skb, CTA_STATUS, sizeof(status), &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_l = ct->timeout.expires - jiffies;
 135         __be32 timeout;
 136
 137         if (timeout_l < 0)
 138                 timeout = 0;
 139         else
 140                 timeout = htonl(timeout_l / HZ);
 141
 142         NLA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
 143         return 0;
 144
 145 nla_put_failure:
 146         return -1;
 147 }
 148
 149 static inline int
 150 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 151 {
 152         struct nf_conntrack_l4proto *l4proto = nf_ct_l4proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num, ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 153         struct nlattr *nest_proto;
 154         int ret;
 155
 156         if (!l4proto->to_nlattr) {
 157                 nf_ct_l4proto_put(l4proto);
 158                 return 0;
 159         }
 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         nf_ct_l4proto_put(l4proto);
 168
 169         nla_nest_end(skb, nest_proto);
 170
 171         return ret;
 172
 173 nla_put_failure:
 174         nf_ct_l4proto_put(l4proto);
 175         return -1;
 176 }
 177
 178 static inline int
 179 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 180 {
 181         struct nlattr *nest_helper;
 182         const struct nf_conn_help *help = nfct_help(ct);
 183         struct nf_conntrack_helper *helper;
 184
 185         if (!help)
 186                 return 0;
 187
 188         rcu_read_lock();
 189         helper = rcu_dereference(help->helper);
 190         if (!helper)
 191                 goto out;
 192
 193         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 194         if (!nest_helper)
 195                 goto nla_put_failure;
 196         NLA_PUT(skb, CTA_HELP_NAME, strlen(helper->name), helper->name);
 197
 198         if (helper->to_nlattr)
 199                 helper->to_nlattr(skb, ct);
 200
 201         nla_nest_end(skb, nest_helper);
 202 out:
 203         rcu_read_unlock();
 204         return 0;
 205
 206 nla_put_failure:
 207         rcu_read_unlock();
 208         return -1;
 209 }
 210
 211 #ifdef CONFIG_NF_CT_ACCT
 212 static inline int
 213 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 214                         enum ip_conntrack_dir dir)
 215 {
 216         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 217         struct nlattr *nest_count;
 218         __be32 tmp;
 219
 220         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 221         if (!nest_count)
 222                 goto nla_put_failure;
 223
 224         tmp = htonl(ct->counters[dir].packets);
 225         NLA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
 226
 227         tmp = htonl(ct->counters[dir].bytes);
 228         NLA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
 229
 230         nla_nest_end(skb, nest_count);
 231
 232         return 0;
 233
 234 nla_put_failure:
 235         return -1;
 236 }
 237 #else
 238 #define ctnetlink_dump_counters(a, b, c) (0)
 239 #endif
 240
 241 #ifdef CONFIG_NF_CONNTRACK_MARK
 242 static inline int
 243 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 244 {
 245         __be32 mark = htonl(ct->mark);
 246
 247         NLA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
 248         return 0;
 249
 250 nla_put_failure:
 251         return -1;
 252 }
 253 #else
 254 #define ctnetlink_dump_mark(a, b) (0)
 255 #endif
 256
 257 static inline int
 258 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 259 {
 260         __be32 id = htonl((unsigned long)ct);
 261         NLA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
 262         return 0;
 263
 264 nla_put_failure:
 265         return -1;
 266 }
 267
 268 static inline int
 269 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 270 {
 271         __be32 use = htonl(atomic_read(&ct->ct_general.use));
 272
 273         NLA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
 274         return 0;
 275
 276 nla_put_failure:
 277         return -1;
 278 }
 279
 280 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 281
 282 static int
 283 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 284                     int event, int nowait,
 285                     const struct nf_conn *ct)
 286 {
 287         struct nlmsghdr *nlh;
 288         struct nfgenmsg *nfmsg;
 289         struct nlattr *nest_parms;
 290         unsigned char *b = skb_tail_pointer(skb);
 291
 292         event |= NFNL_SUBSYS_CTNETLINK << 8;
 293         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 294         nfmsg  = NLMSG_DATA(nlh);
 295
 296         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 297         nfmsg->nfgen_family =
 298                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 299         nfmsg->version      = NFNETLINK_V0;
 300         nfmsg->res_id       = 0;
 301
 302         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 303         if (!nest_parms)
 304                 goto nla_put_failure;
 305         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 306                 goto nla_put_failure;
 307         nla_nest_end(skb, nest_parms);
 308
 309         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 310         if (!nest_parms)
 311                 goto nla_put_failure;
 312         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 313                 goto nla_put_failure;
 314         nla_nest_end(skb, nest_parms);
 315
 316         if (ctnetlink_dump_status(skb, ct) < 0 ||
 317             ctnetlink_dump_timeout(skb, ct) < 0 ||
 318             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 319             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 320             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 321             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 322             ctnetlink_dump_mark(skb, ct) < 0 ||
 323             ctnetlink_dump_id(skb, ct) < 0 ||
 324             ctnetlink_dump_use(skb, ct) < 0)
 325                 goto nla_put_failure;
 326
 327         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 328         return skb->len;
 329
 330 nlmsg_failure:
 331 nla_put_failure:
 332         nlmsg_trim(skb, b);
 333         return -1;
 334 }
 335
 336 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 337 static int ctnetlink_conntrack_event(struct notifier_block *this,
 338                                      unsigned long events, void *ptr)
 339 {
 340         struct nlmsghdr *nlh;
 341         struct nfgenmsg *nfmsg;
 342         struct nlattr *nest_parms;
 343         struct nf_conn *ct = (struct nf_conn *)ptr;
 344         struct sk_buff *skb;
 345         unsigned int type;
 346         sk_buff_data_t b;
 347         unsigned int flags = 0, group;
 348
 349         /* ignore our fake conntrack entry */
 350         if (ct == &nf_conntrack_untracked)
 351                 return NOTIFY_DONE;
 352
 353         if (events & IPCT_DESTROY) {
 354                 type = IPCTNL_MSG_CT_DELETE;
 355                 group = NFNLGRP_CONNTRACK_DESTROY;
 356         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 357                 type = IPCTNL_MSG_CT_NEW;
 358                 flags = NLM_F_CREATE|NLM_F_EXCL;
 359                 group = NFNLGRP_CONNTRACK_NEW;
 360         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 361                 type = IPCTNL_MSG_CT_NEW;
 362                 group = NFNLGRP_CONNTRACK_UPDATE;
 363         } else
 364                 return NOTIFY_DONE;
 365
 366         if (!nfnetlink_has_listeners(group))
 367                 return NOTIFY_DONE;
 368
 369         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 370         if (!skb)
 371                 return NOTIFY_DONE;
 372
 373         b = skb->tail;
 374
 375         type |= NFNL_SUBSYS_CTNETLINK << 8;
 376         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 377         nfmsg = NLMSG_DATA(nlh);
 378
 379         nlh->nlmsg_flags    = flags;
 380         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 381         nfmsg->version  = NFNETLINK_V0;
 382         nfmsg->res_id   = 0;
 383
 384         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 385         if (!nest_parms)
 386                 goto nla_put_failure;
 387         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 388                 goto nla_put_failure;
 389         nla_nest_end(skb, nest_parms);
 390
 391         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 392         if (!nest_parms)
 393                 goto nla_put_failure;
 394         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 395                 goto nla_put_failure;
 396         nla_nest_end(skb, nest_parms);
 397
 398         if (events & IPCT_DESTROY) {
 399                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 400                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 401                         goto nla_put_failure;
 402         } else {
 403                 if (ctnetlink_dump_status(skb, ct) < 0)
 404                         goto nla_put_failure;
 405
 406                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 407                         goto nla_put_failure;
 408
 409                 if (events & IPCT_PROTOINFO
 410                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 411                         goto nla_put_failure;
 412
 413                 if ((events & IPCT_HELPER || nfct_help(ct))
 414                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 415                         goto nla_put_failure;
 416
 417 #ifdef CONFIG_NF_CONNTRACK_MARK
 418                 if ((events & IPCT_MARK || ct->mark)
 419                     && ctnetlink_dump_mark(skb, ct) < 0)
 420                         goto nla_put_failure;
 421 #endif
 422
 423                 if (events & IPCT_COUNTER_FILLING &&
 424                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 425                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 426                         goto nla_put_failure;
 427         }
 428
 429         nlh->nlmsg_len = skb->tail - b;
 430         nfnetlink_send(skb, 0, group, 0);
 431         return NOTIFY_DONE;
 432
 433 nlmsg_failure:
 434 nla_put_failure:
 435         kfree_skb(skb);
 436         return NOTIFY_DONE;
 437 }
 438 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 439
 440 static int ctnetlink_done(struct netlink_callback *cb)
 441 {
 442         if (cb->args[1])
 443                 nf_ct_put((struct nf_conn *)cb->args[1]);
 444         return 0;
 445 }
 446
 447 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
 448
 449 static int
 450 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 451 {
 452         struct nf_conn *ct, *last;
 453         struct nf_conntrack_tuple_hash *h;
 454         struct hlist_node *n;
 455         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 456         u_int8_t l3proto = nfmsg->nfgen_family;
 457
 458         read_lock_bh(&nf_conntrack_lock);
 459         last = (struct nf_conn *)cb->args[1];
 460         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 461 restart:
 462                 hlist_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
 463                                      hnode) {
 464                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 465                                 continue;
 466                         ct = nf_ct_tuplehash_to_ctrack(h);
 467                         /* Dump entries of a given L3 protocol number.
 468                          * If it is not specified, ie. l3proto == 0,
 469                          * then dump everything. */
 470                         if (l3proto && L3PROTO(ct) != l3proto)
 471                                 continue;
 472                         if (cb->args[1]) {
 473                                 if (ct != last)
 474                                         continue;
 475                                 cb->args[1] = 0;
 476                         }
 477                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 478                                                 cb->nlh->nlmsg_seq,
 479                                                 IPCTNL_MSG_CT_NEW,
 480                                                 1, ct) < 0) {
 481                                 nf_conntrack_get(&ct->ct_general);
 482                                 cb->args[1] = (unsigned long)ct;
 483                                 goto out;
 484                         }
 485 #ifdef CONFIG_NF_CT_ACCT
 486                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 487                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 488                                 memset(&ct->counters, 0, sizeof(ct->counters));
 489 #endif
 490                 }
 491                 if (cb->args[1]) {
 492                         cb->args[1] = 0;
 493                         goto restart;
 494                 }
 495         }
 496 out:
 497         read_unlock_bh(&nf_conntrack_lock);
 498         if (last)
 499                 nf_ct_put(last);
 500
 501         return skb->len;
 502 }
 503
 504 static inline int
 505 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 506 {
 507         struct nlattr *tb[CTA_IP_MAX+1];
 508         struct nf_conntrack_l3proto *l3proto;
 509         int ret = 0;
 510
 511         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 512
 513         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 514
 515         if (likely(l3proto->nlattr_to_tuple)) {
 516                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 517                                           l3proto->nla_policy);
 518                 if (ret == 0)
 519                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 520         }
 521
 522         nf_ct_l3proto_put(l3proto);
 523
 524         return ret;
 525 }
 526
 527 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 528         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 529 };
 530
 531 static inline int
 532 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 533                             struct nf_conntrack_tuple *tuple)
 534 {
 535         struct nlattr *tb[CTA_PROTO_MAX+1];
 536         struct nf_conntrack_l4proto *l4proto;
 537         int ret = 0;
 538
 539         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 540         if (ret < 0)
 541                 return ret;
 542
 543         if (!tb[CTA_PROTO_NUM])
 544                 return -EINVAL;
 545         tuple->dst.protonum = *(u_int8_t *)nla_data(tb[CTA_PROTO_NUM]);
 546
 547         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 548
 549         if (likely(l4proto->nlattr_to_tuple)) {
 550                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 551                                           l4proto->nla_policy);
 552                 if (ret == 0)
 553                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 554         }
 555
 556         nf_ct_l4proto_put(l4proto);
 557
 558         return ret;
 559 }
 560
 561 static inline int
 562 ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 563                       enum ctattr_tuple type, u_int8_t l3num)
 564 {
 565         struct nlattr *tb[CTA_TUPLE_MAX+1];
 566         int err;
 567
 568         memset(tuple, 0, sizeof(*tuple));
 569
 570         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 571
 572         if (!tb[CTA_TUPLE_IP])
 573                 return -EINVAL;
 574
 575         tuple->src.l3num = l3num;
 576
 577         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 578         if (err < 0)
 579                 return err;
 580
 581         if (!tb[CTA_TUPLE_PROTO])
 582                 return -EINVAL;
 583
 584         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 585         if (err < 0)
 586                 return err;
 587
 588         /* orig and expect tuples get DIR_ORIGINAL */
 589         if (type == CTA_TUPLE_REPLY)
 590                 tuple->dst.dir = IP_CT_DIR_REPLY;
 591         else
 592                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 593
 594         return 0;
 595 }
 596
 597 #ifdef CONFIG_NF_NAT_NEEDED
 598 static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = {
 599         [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 },
 600         [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 },
 601 };
 602
 603 static int nfnetlink_parse_nat_proto(struct nlattr *attr,
 604                                      const struct nf_conn *ct,
 605                                      struct nf_nat_range *range)
 606 {
 607         struct nlattr *tb[CTA_PROTONAT_MAX+1];
 608         struct nf_nat_protocol *npt;
 609         int err;
 610
 611         err = nla_parse_nested(tb, CTA_PROTONAT_MAX, attr, protonat_nla_policy);
 612         if (err < 0)
 613                 return err;
 614
 615         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 616
 617         if (!npt->nlattr_to_range) {
 618                 nf_nat_proto_put(npt);
 619                 return 0;
 620         }
 621
 622         /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
 623         if (npt->nlattr_to_range(tb, range) > 0)
 624                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
 625
 626         nf_nat_proto_put(npt);
 627
 628         return 0;
 629 }
 630
 631 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {
 632         [CTA_NAT_MINIP]         = { .type = NLA_U32 },
 633         [CTA_NAT_MAXIP]         = { .type = NLA_U32 },
 634 };
 635
 636 static inline int
 637 nfnetlink_parse_nat(struct nlattr *nat,
 638                     const struct nf_conn *ct, struct nf_nat_range *range)
 639 {
 640         struct nlattr *tb[CTA_NAT_MAX+1];
 641         int err;
 642
 643         memset(range, 0, sizeof(*range));
 644
 645         err = nla_parse_nested(tb, CTA_NAT_MAX, nat, nat_nla_policy);
 646         if (err < 0)
 647                 return err;
 648
 649         if (tb[CTA_NAT_MINIP])
 650                 range->min_ip = *(__be32 *)nla_data(tb[CTA_NAT_MINIP]);
 651
 652         if (!tb[CTA_NAT_MAXIP])
 653                 range->max_ip = range->min_ip;
 654         else
 655                 range->max_ip = *(__be32 *)nla_data(tb[CTA_NAT_MAXIP]);
 656
 657         if (range->min_ip)
 658                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 659
 660         if (!tb[CTA_NAT_PROTO])
 661                 return 0;
 662
 663         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO], ct, range);
 664         if (err < 0)
 665                 return err;
 666
 667         return 0;
 668 }
 669 #endif
 670
 671 static inline int
 672 ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 673 {
 674         struct nlattr *tb[CTA_HELP_MAX+1];
 675
 676         nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 677
 678         if (!tb[CTA_HELP_NAME])
 679                 return -EINVAL;
 680
 681         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 682
 683         return 0;
 684 }
 685
 686 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 687         [CTA_STATUS]            = { .type = NLA_U32 },
 688         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 689         [CTA_MARK]              = { .type = NLA_U32 },
 690         [CTA_USE]               = { .type = NLA_U32 },
 691         [CTA_ID]                = { .type = NLA_U32 },
 692 };
 693
 694 static int
 695 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 696                         struct nlmsghdr *nlh, struct nlattr *cda[])
 697 {
 698         struct nf_conntrack_tuple_hash *h;
 699         struct nf_conntrack_tuple tuple;
 700         struct nf_conn *ct;
 701         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 702         u_int8_t u3 = nfmsg->nfgen_family;
 703         int err = 0;
 704
 705         if (cda[CTA_TUPLE_ORIG])
 706                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 707         else if (cda[CTA_TUPLE_REPLY])
 708                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 709         else {
 710                 /* Flush the whole table */
 711                 nf_conntrack_flush();
 712                 return 0;
 713         }
 714
 715         if (err < 0)
 716                 return err;
 717
 718         h = nf_conntrack_find_get(&tuple);
 719         if (!h)
 720                 return -ENOENT;
 721
 722         ct = nf_ct_tuplehash_to_ctrack(h);
 723
 724         if (cda[CTA_ID]) {
 725                 u_int32_t id = ntohl(*(__be32 *)nla_data(cda[CTA_ID]));
 726                 if (id != (u32)(unsigned long)ct) {
 727                         nf_ct_put(ct);
 728                         return -ENOENT;
 729                 }
 730         }
 731         if (del_timer(&ct->timeout))
 732                 ct->timeout.function((unsigned long)ct);
 733
 734         nf_ct_put(ct);
 735
 736         return 0;
 737 }
 738
 739 static int
 740 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 741                         struct nlmsghdr *nlh, struct nlattr *cda[])
 742 {
 743         struct nf_conntrack_tuple_hash *h;
 744         struct nf_conntrack_tuple tuple;
 745         struct nf_conn *ct;
 746         struct sk_buff *skb2 = NULL;
 747         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 748         u_int8_t u3 = nfmsg->nfgen_family;
 749         int err = 0;
 750
 751         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 752 #ifndef CONFIG_NF_CT_ACCT
 753                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 754                         return -ENOTSUPP;
 755 #endif
 756                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 757                                           ctnetlink_done);
 758         }
 759
 760         if (cda[CTA_TUPLE_ORIG])
 761                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 762         else if (cda[CTA_TUPLE_REPLY])
 763                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 764         else
 765                 return -EINVAL;
 766
 767         if (err < 0)
 768                 return err;
 769
 770         h = nf_conntrack_find_get(&tuple);
 771         if (!h)
 772                 return -ENOENT;
 773
 774         ct = nf_ct_tuplehash_to_ctrack(h);
 775
 776         err = -ENOMEM;
 777         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 778         if (!skb2) {
 779                 nf_ct_put(ct);
 780                 return -ENOMEM;
 781         }
 782
 783         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 784                                   IPCTNL_MSG_CT_NEW, 1, ct);
 785         nf_ct_put(ct);
 786         if (err <= 0)
 787                 goto free;
 788
 789         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 790         if (err < 0)
 791                 goto out;
 792
 793         return 0;
 794
 795 free:
 796         kfree_skb(skb2);
 797 out:
 798         return err;
 799 }
 800
 801 static inline int
 802 ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 803 {
 804         unsigned long d;
 805         unsigned int status = ntohl(*(__be32 *)nla_data(cda[CTA_STATUS]));
 806         d = ct->status ^ status;
 807
 808         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 809                 /* unchangeable */
 810                 return -EINVAL;
 811
 812         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 813                 /* SEEN_REPLY bit can only be set */
 814                 return -EINVAL;
 815
 816
 817         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 818                 /* ASSURED bit can only be set */
 819                 return -EINVAL;
 820
 821         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
 822 #ifndef CONFIG_NF_NAT_NEEDED
 823                 return -EINVAL;
 824 #else
 825                 struct nf_nat_range range;
 826
 827                 if (cda[CTA_NAT_DST]) {
 828                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST], ct,
 829                                                 &range) < 0)
 830                                 return -EINVAL;
 831                         if (nf_nat_initialized(ct,
 832                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
 833                                 return -EEXIST;
 834                         nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
 835                 }
 836                 if (cda[CTA_NAT_SRC]) {
 837                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC], ct,
 838                                                 &range) < 0)
 839                                 return -EINVAL;
 840                         if (nf_nat_initialized(ct,
 841                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
 842                                 return -EEXIST;
 843                         nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
 844                 }
 845 #endif
 846         }
 847
 848         /* Be careful here, modifying NAT bits can screw up things,
 849          * so don't let users modify them directly if they don't pass
 850          * nf_nat_range. */
 851         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 852         return 0;
 853 }
 854
 855
 856 static inline int
 857 ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 858 {
 859         struct nf_conntrack_helper *helper;
 860         struct nf_conn_help *help = nfct_help(ct);
 861         char *helpname;
 862         int err;
 863
 864         /* don't change helper of sibling connections */
 865         if (ct->master)
 866                 return -EINVAL;
 867
 868         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 869         if (err < 0)
 870                 return err;
 871
 872         if (!strcmp(helpname, "")) {
 873                 if (help && help->helper) {
 874                         /* we had a helper before ... */
 875                         nf_ct_remove_expectations(ct);
 876                         rcu_assign_pointer(help->helper, NULL);
 877                 }
 878
 879                 return 0;
 880         }
 881
 882         helper = __nf_conntrack_helper_find_byname(helpname);
 883         if (helper == NULL)
 884                 return -EINVAL;
 885
 886         if (help) {
 887                 if (help->helper == helper)
 888                         return 0;
 889                 if (help->helper)
 890                         return -EBUSY;
 891                 /* need to zero data of old helper */
 892                 memset(&help->help, 0, sizeof(help->help));
 893         } else {
 894                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
 895                 if (help == NULL)
 896                         return -ENOMEM;
 897         }
 898
 899         rcu_assign_pointer(help->helper, helper);
 900
 901         return 0;
 902 }
 903
 904 static inline int
 905 ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 906 {
 907         u_int32_t timeout = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
 908
 909         if (!del_timer(&ct->timeout))
 910                 return -ETIME;
 911
 912         ct->timeout.expires = jiffies + timeout * HZ;
 913         add_timer(&ct->timeout);
 914
 915         return 0;
 916 }
 917
 918 static inline int
 919 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 920 {
 921         struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
 922         struct nf_conntrack_l4proto *l4proto;
 923         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
 924         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 925         int err = 0;
 926
 927         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 928
 929         l4proto = nf_ct_l4proto_find_get(l3num, npt);
 930
 931         if (l4proto->from_nlattr)
 932                 err = l4proto->from_nlattr(tb, ct);
 933         nf_ct_l4proto_put(l4proto);
 934
 935         return err;
 936 }
 937
 938 static int
 939 ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
 940 {
 941         int err;
 942
 943         if (cda[CTA_HELP]) {
 944                 err = ctnetlink_change_helper(ct, cda);
 945                 if (err < 0)
 946                         return err;
 947         }
 948
 949         if (cda[CTA_TIMEOUT]) {
 950                 err = ctnetlink_change_timeout(ct, cda);
 951                 if (err < 0)
 952                         return err;
 953         }
 954
 955         if (cda[CTA_STATUS]) {
 956                 err = ctnetlink_change_status(ct, cda);
 957                 if (err < 0)
 958                         return err;
 959         }
 960
 961         if (cda[CTA_PROTOINFO]) {
 962                 err = ctnetlink_change_protoinfo(ct, cda);
 963                 if (err < 0)
 964                         return err;
 965         }
 966
 967 #if defined(CONFIG_NF_CONNTRACK_MARK)
 968         if (cda[CTA_MARK])
 969                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
 970 #endif
 971
 972         return 0;
 973 }
 974
 975 static int
 976 ctnetlink_create_conntrack(struct nlattr *cda[],
 977                            struct nf_conntrack_tuple *otuple,
 978                            struct nf_conntrack_tuple *rtuple,
 979                            struct nf_conn *master_ct)
 980 {
 981         struct nf_conn *ct;
 982         int err = -EINVAL;
 983         struct nf_conn_help *help;
 984         struct nf_conntrack_helper *helper;
 985
 986         ct = nf_conntrack_alloc(otuple, rtuple);
 987         if (ct == NULL || IS_ERR(ct))
 988                 return -ENOMEM;
 989
 990         if (!cda[CTA_TIMEOUT])
 991                 goto err;
 992         ct->timeout.expires = ntohl(*(__be32 *)nla_data(cda[CTA_TIMEOUT]));
 993
 994         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
 995         ct->status |= IPS_CONFIRMED;
 996
 997         if (cda[CTA_STATUS]) {
 998                 err = ctnetlink_change_status(ct, cda);
 999                 if (err < 0)
1000                         goto err;
1001         }
1002
1003         if (cda[CTA_PROTOINFO]) {
1004                 err = ctnetlink_change_protoinfo(ct, cda);
1005                 if (err < 0)
1006                         goto err;
1007         }
1008
1009 #if defined(CONFIG_NF_CONNTRACK_MARK)
1010         if (cda[CTA_MARK])
1011                 ct->mark = ntohl(*(__be32 *)nla_data(cda[CTA_MARK]));
1012 #endif
1013
1014         helper = nf_ct_helper_find_get(rtuple);
1015         if (helper) {
1016                 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
1017                 if (help == NULL) {
1018                         nf_ct_helper_put(helper);
1019                         err = -ENOMEM;
1020                         goto err;
1021                 }
1022                 /* not in hash table yet so not strictly necessary */
1023                 rcu_assign_pointer(help->helper, helper);
1024         }
1025
1026         /* setup master conntrack: this is a confirmed expectation */
1027         if (master_ct)
1028                 ct->master = master_ct;
1029
1030         add_timer(&ct->timeout);
1031         nf_conntrack_hash_insert(ct);
1032
1033         if (helper)
1034                 nf_ct_helper_put(helper);
1035
1036         return 0;
1037
1038 err:
1039         nf_conntrack_free(ct);
1040         return err;
1041 }
1042
1043 static int
1044 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1045                         struct nlmsghdr *nlh, struct nlattr *cda[])
1046 {
1047         struct nf_conntrack_tuple otuple, rtuple;
1048         struct nf_conntrack_tuple_hash *h = NULL;
1049         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1050         u_int8_t u3 = nfmsg->nfgen_family;
1051         int err = 0;
1052
1053         if (cda[CTA_TUPLE_ORIG]) {
1054                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1055                 if (err < 0)
1056                         return err;
1057         }
1058
1059         if (cda[CTA_TUPLE_REPLY]) {
1060                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1061                 if (err < 0)
1062                         return err;
1063         }
1064
1065         write_lock_bh(&nf_conntrack_lock);
1066         if (cda[CTA_TUPLE_ORIG])
1067                 h = __nf_conntrack_find(&otuple, NULL);
1068         else if (cda[CTA_TUPLE_REPLY])
1069                 h = __nf_conntrack_find(&rtuple, NULL);
1070
1071         if (h == NULL) {
1072                 struct nf_conntrack_tuple master;
1073                 struct nf_conntrack_tuple_hash *master_h = NULL;
1074                 struct nf_conn *master_ct = NULL;
1075
1076                 if (cda[CTA_TUPLE_MASTER]) {
1077                         err = ctnetlink_parse_tuple(cda,
1078                                                     &master,
1079                                                     CTA_TUPLE_MASTER,
1080                                                     u3);
1081                         if (err < 0)
1082                                 return err;
1083
1084                         master_h = __nf_conntrack_find(&master, NULL);
1085                         if (master_h == NULL) {
1086                                 err = -ENOENT;
1087                                 goto out_unlock;
1088                         }
1089                         master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1090                         atomic_inc(&master_ct->ct_general.use);
1091                 }
1092
1093                 write_unlock_bh(&nf_conntrack_lock);
1094                 err = -ENOENT;
1095                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1096                         err = ctnetlink_create_conntrack(cda,
1097                                                          &otuple,
1098                                                          &rtuple,
1099                                                          master_ct);
1100                 if (err < 0 && master_ct)
1101                         nf_ct_put(master_ct);
1102
1103                 return err;
1104         }
1105         /* implicit 'else' */
1106
1107         /* We manipulate the conntrack inside the global conntrack table lock,
1108          * so there's no need to increase the refcount */
1109         err = -EEXIST;
1110         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1111                 /* we only allow nat config for new conntracks */
1112                 if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1113                         err = -EINVAL;
1114                         goto out_unlock;
1115                 }
1116                 /* can't link an existing conntrack to a master */
1117                 if (cda[CTA_TUPLE_MASTER]) {
1118                         err = -EINVAL;
1119                         goto out_unlock;
1120                 }
1121                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1122                                                  cda);
1123         }
1124
1125 out_unlock:
1126         write_unlock_bh(&nf_conntrack_lock);
1127         return err;
1128 }
1129
1130 /***********************************************************************
1131  * EXPECT
1132  ***********************************************************************/
1133
1134 static inline int
1135 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1136                          const struct nf_conntrack_tuple *tuple,
1137                          enum ctattr_expect type)
1138 {
1139         struct nlattr *nest_parms;
1140
1141         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1142         if (!nest_parms)
1143                 goto nla_put_failure;
1144         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1145                 goto nla_put_failure;
1146         nla_nest_end(skb, nest_parms);
1147
1148         return 0;
1149
1150 nla_put_failure:
1151         return -1;
1152 }
1153
1154 static inline int
1155 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1156                         const struct nf_conntrack_tuple *tuple,
1157                         const struct nf_conntrack_tuple_mask *mask)
1158 {
1159         int ret;
1160         struct nf_conntrack_l3proto *l3proto;
1161         struct nf_conntrack_l4proto *l4proto;
1162         struct nf_conntrack_tuple m;
1163         struct nlattr *nest_parms;
1164
1165         memset(&m, 0xFF, sizeof(m));
1166         m.src.u.all = mask->src.u.all;
1167         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1168
1169         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1170         if (!nest_parms)
1171                 goto nla_put_failure;
1172
1173         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1174         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1175         nf_ct_l3proto_put(l3proto);
1176
1177         if (unlikely(ret < 0))
1178                 goto nla_put_failure;
1179
1180         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1181         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1182         nf_ct_l4proto_put(l4proto);
1183         if (unlikely(ret < 0))
1184                 goto nla_put_failure;
1185
1186         nla_nest_end(skb, nest_parms);
1187
1188         return 0;
1189
1190 nla_put_failure:
1191         return -1;
1192 }
1193
1194 static inline int
1195 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1196                           const struct nf_conntrack_expect *exp)
1197 {
1198         struct nf_conn *master = exp->master;
1199         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1200         __be32 id = htonl((unsigned long)exp);
1201
1202         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1203                 goto nla_put_failure;
1204         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1205                 goto nla_put_failure;
1206         if (ctnetlink_exp_dump_tuple(skb,
1207                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1208                                  CTA_EXPECT_MASTER) < 0)
1209                 goto nla_put_failure;
1210
1211         NLA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1212         NLA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1213
1214         return 0;
1215
1216 nla_put_failure:
1217         return -1;
1218 }
1219
1220 static int
1221 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1222                     int event,
1223                     int nowait,
1224                     const struct nf_conntrack_expect *exp)
1225 {
1226         struct nlmsghdr *nlh;
1227         struct nfgenmsg *nfmsg;
1228         unsigned char *b = skb_tail_pointer(skb);
1229
1230         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1231         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1232         nfmsg  = NLMSG_DATA(nlh);
1233
1234         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1235         nfmsg->nfgen_family = exp->tuple.src.l3num;
1236         nfmsg->version      = NFNETLINK_V0;
1237         nfmsg->res_id       = 0;
1238
1239         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1240                 goto nla_put_failure;
1241
1242         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1243         return skb->len;
1244
1245 nlmsg_failure:
1246 nla_put_failure:
1247         nlmsg_trim(skb, b);
1248         return -1;
1249 }
1250
1251 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1252 static int ctnetlink_expect_event(struct notifier_block *this,
1253                                   unsigned long events, void *ptr)
1254 {
1255         struct nlmsghdr *nlh;
1256         struct nfgenmsg *nfmsg;
1257         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1258         struct sk_buff *skb;
1259         unsigned int type;
1260         sk_buff_data_t b;
1261         int flags = 0;
1262
1263         if (events & IPEXP_NEW) {
1264                 type = IPCTNL_MSG_EXP_NEW;
1265                 flags = NLM_F_CREATE|NLM_F_EXCL;
1266         } else
1267                 return NOTIFY_DONE;
1268
1269         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1270                 return NOTIFY_DONE;
1271
1272         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1273         if (!skb)
1274                 return NOTIFY_DONE;
1275
1276         b = skb->tail;
1277
1278         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1279         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1280         nfmsg = NLMSG_DATA(nlh);
1281
1282         nlh->nlmsg_flags    = flags;
1283         nfmsg->nfgen_family = exp->tuple.src.l3num;
1284         nfmsg->version      = NFNETLINK_V0;
1285         nfmsg->res_id       = 0;
1286
1287         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1288                 goto nla_put_failure;
1289
1290         nlh->nlmsg_len = skb->tail - b;
1291         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1292         return NOTIFY_DONE;
1293
1294 nlmsg_failure:
1295 nla_put_failure:
1296         kfree_skb(skb);
1297         return NOTIFY_DONE;
1298 }
1299 #endif
1300 static int ctnetlink_exp_done(struct netlink_callback *cb)
1301 {
1302         if (cb->args[1])
1303                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1304         return 0;
1305 }
1306
1307 static int
1308 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1309 {
1310         struct nf_conntrack_expect *exp, *last;
1311         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1312         struct hlist_node *n;
1313         u_int8_t l3proto = nfmsg->nfgen_family;
1314
1315         read_lock_bh(&nf_conntrack_lock);
1316         last = (struct nf_conntrack_expect *)cb->args[1];
1317         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1318 restart:
1319                 hlist_for_each_entry(exp, n, &nf_ct_expect_hash[cb->args[0]],
1320                                      hnode) {
1321                         if (l3proto && exp->tuple.src.l3num != l3proto)
1322                                 continue;
1323                         if (cb->args[1]) {
1324                                 if (exp != last)
1325                                         continue;
1326                                 cb->args[1] = 0;
1327                         }
1328                         if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1329                                                     cb->nlh->nlmsg_seq,
1330                                                     IPCTNL_MSG_EXP_NEW,
1331                                                     1, exp) < 0) {
1332                                 atomic_inc(&exp->use);
1333                                 cb->args[1] = (unsigned long)exp;
1334                                 goto out;
1335                         }
1336                 }
1337                 if (cb->args[1]) {
1338                         cb->args[1] = 0;
1339                         goto restart;
1340                 }
1341         }
1342 out:
1343         read_unlock_bh(&nf_conntrack_lock);
1344         if (last)
1345                 nf_ct_expect_put(last);
1346
1347         return skb->len;
1348 }
1349
1350 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1351         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1352         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1353 };
1354
1355 static int
1356 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1357                      struct nlmsghdr *nlh, struct nlattr *cda[])
1358 {
1359         struct nf_conntrack_tuple tuple;
1360         struct nf_conntrack_expect *exp;
1361         struct sk_buff *skb2;
1362         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1363         u_int8_t u3 = nfmsg->nfgen_family;
1364         int err = 0;
1365
1366         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1367                 return netlink_dump_start(ctnl, skb, nlh,
1368                                           ctnetlink_exp_dump_table,
1369                                           ctnetlink_exp_done);
1370         }
1371
1372         if (cda[CTA_EXPECT_MASTER])
1373                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1374         else
1375                 return -EINVAL;
1376
1377         if (err < 0)
1378                 return err;
1379
1380         exp = nf_ct_expect_find_get(&tuple);
1381         if (!exp)
1382                 return -ENOENT;
1383
1384         if (cda[CTA_EXPECT_ID]) {
1385                 __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1386                 if (ntohl(id) != (u32)(unsigned long)exp) {
1387                         nf_ct_expect_put(exp);
1388                         return -ENOENT;
1389                 }
1390         }
1391
1392         err = -ENOMEM;
1393         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1394         if (!skb2)
1395                 goto out;
1396
1397         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1398                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1399                                       1, exp);
1400         if (err <= 0)
1401                 goto free;
1402
1403         nf_ct_expect_put(exp);
1404
1405         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1406
1407 free:
1408         kfree_skb(skb2);
1409 out:
1410         nf_ct_expect_put(exp);
1411         return err;
1412 }
1413
1414 static int
1415 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1416                      struct nlmsghdr *nlh, struct nlattr *cda[])
1417 {
1418         struct nf_conntrack_expect *exp;
1419         struct nf_conntrack_tuple tuple;
1420         struct nf_conntrack_helper *h;
1421         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1422         struct hlist_node *n, *next;
1423         u_int8_t u3 = nfmsg->nfgen_family;
1424         unsigned int i;
1425         int err;
1426
1427         if (cda[CTA_EXPECT_TUPLE]) {
1428                 /* delete a single expect by tuple */
1429                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1430                 if (err < 0)
1431                         return err;
1432
1433                 /* bump usage count to 2 */
1434                 exp = nf_ct_expect_find_get(&tuple);
1435                 if (!exp)
1436                         return -ENOENT;
1437
1438                 if (cda[CTA_EXPECT_ID]) {
1439                         __be32 id = *(__be32 *)nla_data(cda[CTA_EXPECT_ID]);
1440                         if (ntohl(id) != (u32)(unsigned long)exp) {
1441                                 nf_ct_expect_put(exp);
1442                                 return -ENOENT;
1443                         }
1444                 }
1445
1446                 /* after list removal, usage count == 1 */
1447                 nf_ct_unexpect_related(exp);
1448                 /* have to put what we 'get' above.
1449                  * after this line usage count == 0 */
1450                 nf_ct_expect_put(exp);
1451         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1452                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1453                 struct nf_conn_help *m_help;
1454
1455                 /* delete all expectations for this helper */
1456                 write_lock_bh(&nf_conntrack_lock);
1457                 h = __nf_conntrack_helper_find_byname(name);
1458                 if (!h) {
1459                         write_unlock_bh(&nf_conntrack_lock);
1460                         return -EINVAL;
1461                 }
1462                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1463                         hlist_for_each_entry_safe(exp, n, next,
1464                                                   &nf_ct_expect_hash[i],
1465                                                   hnode) {
1466                                 m_help = nfct_help(exp->master);
1467                                 if (m_help->helper == h
1468                                     && del_timer(&exp->timeout)) {
1469                                         nf_ct_unlink_expect(exp);
1470                                         nf_ct_expect_put(exp);
1471                                 }
1472                         }
1473                 }
1474                 write_unlock_bh(&nf_conntrack_lock);
1475         } else {
1476                 /* This basically means we have to flush everything*/
1477                 write_lock_bh(&nf_conntrack_lock);
1478                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1479                         hlist_for_each_entry_safe(exp, n, next,
1480                                                   &nf_ct_expect_hash[i],
1481                                                   hnode) {
1482                                 if (del_timer(&exp->timeout)) {
1483                                         nf_ct_unlink_expect(exp);
1484                                         nf_ct_expect_put(exp);
1485                                 }
1486                         }
1487                 }
1488                 write_unlock_bh(&nf_conntrack_lock);
1489         }
1490
1491         return 0;
1492 }
1493 static int
1494 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1495 {
1496         return -EOPNOTSUPP;
1497 }
1498
1499 static int
1500 ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1501 {
1502         struct nf_conntrack_tuple tuple, mask, master_tuple;
1503         struct nf_conntrack_tuple_hash *h = NULL;
1504         struct nf_conntrack_expect *exp;
1505         struct nf_conn *ct;
1506         struct nf_conn_help *help;
1507         int err = 0;
1508
1509         /* caller guarantees that those three CTA_EXPECT_* exist */
1510         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1511         if (err < 0)
1512                 return err;
1513         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1514         if (err < 0)
1515                 return err;
1516         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1517         if (err < 0)
1518                 return err;
1519
1520         /* Look for master conntrack of this expectation */
1521         h = nf_conntrack_find_get(&master_tuple);
1522         if (!h)
1523                 return -ENOENT;
1524         ct = nf_ct_tuplehash_to_ctrack(h);
1525         help = nfct_help(ct);
1526
1527         if (!help || !help->helper) {
1528                 /* such conntrack hasn't got any helper, abort */
1529                 err = -EINVAL;
1530                 goto out;
1531         }
1532
1533         exp = nf_ct_expect_alloc(ct);
1534         if (!exp) {
1535                 err = -ENOMEM;
1536                 goto out;
1537         }
1538
1539         exp->expectfn = NULL;
1540         exp->flags = 0;
1541         exp->master = ct;
1542         exp->helper = NULL;
1543         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1544         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1545         exp->mask.src.u.all = mask.src.u.all;
1546
1547         err = nf_ct_expect_related(exp);
1548         nf_ct_expect_put(exp);
1549
1550 out:
1551         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1552         return err;
1553 }
1554
1555 static int
1556 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1557                      struct nlmsghdr *nlh, struct nlattr *cda[])
1558 {
1559         struct nf_conntrack_tuple tuple;
1560         struct nf_conntrack_expect *exp;
1561         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1562         u_int8_t u3 = nfmsg->nfgen_family;
1563         int err = 0;
1564
1565         if (!cda[CTA_EXPECT_TUPLE]
1566             || !cda[CTA_EXPECT_MASK]
1567             || !cda[CTA_EXPECT_MASTER])
1568                 return -EINVAL;
1569
1570         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1571         if (err < 0)
1572                 return err;
1573
1574         write_lock_bh(&nf_conntrack_lock);
1575         exp = __nf_ct_expect_find(&tuple);
1576
1577         if (!exp) {
1578                 write_unlock_bh(&nf_conntrack_lock);
1579                 err = -ENOENT;
1580                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1581                         err = ctnetlink_create_expect(cda, u3);
1582                 return err;
1583         }
1584
1585         err = -EEXIST;
1586         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1587                 err = ctnetlink_change_expect(exp, cda);
1588         write_unlock_bh(&nf_conntrack_lock);
1589
1590         return err;
1591 }
1592
1593 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1594 static struct notifier_block ctnl_notifier = {
1595         .notifier_call  = ctnetlink_conntrack_event,
1596 };
1597
1598 static struct notifier_block ctnl_notifier_exp = {
1599         .notifier_call  = ctnetlink_expect_event,
1600 };
1601 #endif
1602
1603 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1604         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1605                                             .attr_count = CTA_MAX,
1606                                             .policy = ct_nla_policy },
1607         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1608                                             .attr_count = CTA_MAX,
1609                                             .policy = ct_nla_policy },
1610         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1611                                             .attr_count = CTA_MAX,
1612                                             .policy = ct_nla_policy },
1613         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1614                                             .attr_count = CTA_MAX,
1615                                             .policy = ct_nla_policy },
1616 };
1617
1618 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1619         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1620                                             .attr_count = CTA_EXPECT_MAX,
1621                                             .policy = exp_nla_policy },
1622         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1623                                             .attr_count = CTA_EXPECT_MAX,
1624                                             .policy = exp_nla_policy },
1625         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1626                                             .attr_count = CTA_EXPECT_MAX,
1627                                             .policy = exp_nla_policy },
1628 };
1629
1630 static const struct nfnetlink_subsystem ctnl_subsys = {
1631         .name                           = "conntrack",
1632         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1633         .cb_count                       = IPCTNL_MSG_MAX,
1634         .cb                             = ctnl_cb,
1635 };
1636
1637 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1638         .name                           = "conntrack_expect",
1639         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1640         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1641         .cb                             = ctnl_exp_cb,
1642 };
1643
1644 MODULE_ALIAS("ip_conntrack_netlink");
1645 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1646 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1647
1648 static int __init ctnetlink_init(void)
1649 {
1650         int ret;
1651
1652         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1653         ret = nfnetlink_subsys_register(&ctnl_subsys);
1654         if (ret < 0) {
1655                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1656                 goto err_out;
1657         }
1658
1659         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1660         if (ret < 0) {
1661                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1662                 goto err_unreg_subsys;
1663         }
1664
1665 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1666         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1667         if (ret < 0) {
1668                 printk("ctnetlink_init: cannot register notifier.\n");
1669                 goto err_unreg_exp_subsys;
1670         }
1671
1672         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1673         if (ret < 0) {
1674                 printk("ctnetlink_init: cannot expect register notifier.\n");
1675                 goto err_unreg_notifier;
1676         }
1677 #endif
1678
1679         return 0;
1680
1681 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1682 err_unreg_notifier:
1683         nf_conntrack_unregister_notifier(&ctnl_notifier);
1684 err_unreg_exp_subsys:
1685         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1686 #endif
1687 err_unreg_subsys:
1688         nfnetlink_subsys_unregister(&ctnl_subsys);
1689 err_out:
1690         return ret;
1691 }
1692
1693 static void __exit ctnetlink_exit(void)
1694 {
1695         printk("ctnetlink: unregistering from nfnetlink.\n");
1696
1697 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1698         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1699         nf_conntrack_unregister_notifier(&ctnl_notifier);
1700 #endif
1701
1702         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1703         nfnetlink_subsys_unregister(&ctnl_subsys);
1704         return;
1705 }
1706
1707 module_init(ctnetlink_init);
1708 module_exit(ctnetlink_exit);