SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2006 by Pablo Neira Ayuso <pablo@eurodev.net>
   8  *
   9  * I've reworked this stuff to use attributes instead of conntrack
  10  * structures. 5.44 am. I need more tea. --pablo 05/07/11.
  11  *
  12  * Initial connection tracking via netlink development funded and
  13  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  14  *
  15  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  16  *
  17  * This software may be used and distributed according to the terms
  18  * of the GNU General Public License, incorporated herein by reference.
  19  *
  20  * Derived from ip_conntrack_netlink.c: Port by Pablo Neira Ayuso (05/11/14)
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/types.h>
  27 #include <linux/timer.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/errno.h>
  30 #include <linux/netlink.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/notifier.h>
  34
  35 #include <linux/netfilter.h>
  36 #include <net/netlink.h>
  37 #include <net/netfilter/nf_conntrack.h>
  38 #include <net/netfilter/nf_conntrack_core.h>
  39 #include <net/netfilter/nf_conntrack_expect.h>
  40 #include <net/netfilter/nf_conntrack_helper.h>
  41 #include <net/netfilter/nf_conntrack_l3proto.h>
  42 #include <net/netfilter/nf_conntrack_l4proto.h>
  43 #include <net/netfilter/nf_conntrack_tuple.h>
  44 #ifdef CONFIG_NF_NAT_NEEDED
  45 #include <net/netfilter/nf_nat_core.h>
  46 #include <net/netfilter/nf_nat_protocol.h>
  47 #endif
  48
  49 #include <linux/netfilter/nfnetlink.h>
  50 #include <linux/netfilter/nfnetlink_conntrack.h>
  51
  52 MODULE_LICENSE("GPL");
  53
  54 static char __initdata version[] = "0.93";
  55
  56 static inline int
  57 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  58                             const struct nf_conntrack_tuple *tuple,
  59                             struct nf_conntrack_l4proto *l4proto)
  60 {
  61         int ret = 0;
  62         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
  63
  64         NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
  65
  66         if (likely(l4proto->tuple_to_nfattr))
  67                 ret = l4proto->tuple_to_nfattr(skb, tuple);
  68
  69         NFA_NEST_END(skb, nest_parms);
  70
  71         return ret;
  72
  73 nfattr_failure:
  74         return -1;
  75 }
  76
  77 static inline int
  78 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  79                          const struct nf_conntrack_tuple *tuple,
  80                          struct nf_conntrack_l3proto *l3proto)
  81 {
  82         int ret = 0;
  83         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
  84
  85         if (likely(l3proto->tuple_to_nfattr))
  86                 ret = l3proto->tuple_to_nfattr(skb, tuple);
  87
  88         NFA_NEST_END(skb, nest_parms);
  89
  90         return ret;
  91
  92 nfattr_failure:
  93         return -1;
  94 }
  95
  96 static inline int
  97 ctnetlink_dump_tuples(struct sk_buff *skb,
  98                       const struct nf_conntrack_tuple *tuple)
  99 {
 100         int ret;
 101         struct nf_conntrack_l3proto *l3proto;
 102         struct nf_conntrack_l4proto *l4proto;
 103
 104         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 105         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 106         nf_ct_l3proto_put(l3proto);
 107
 108         if (unlikely(ret < 0))
 109                 return ret;
 110
 111         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 112         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 113         nf_ct_l4proto_put(l4proto);
 114
 115         return ret;
 116 }
 117
 118 static inline int
 119 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 120 {
 121         __be32 status = htonl((u_int32_t) ct->status);
 122         NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
 123         return 0;
 124
 125 nfattr_failure:
 126         return -1;
 127 }
 128
 129 static inline int
 130 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 131 {
 132         long timeout_l = ct->timeout.expires - jiffies;
 133         __be32 timeout;
 134
 135         if (timeout_l < 0)
 136                 timeout = 0;
 137         else
 138                 timeout = htonl(timeout_l / HZ);
 139
 140         NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
 141         return 0;
 142
 143 nfattr_failure:
 144         return -1;
 145 }
 146
 147 static inline int
 148 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 149 {
 150         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);
 151         struct nfattr *nest_proto;
 152         int ret;
 153
 154         if (!l4proto->to_nfattr) {
 155                 nf_ct_l4proto_put(l4proto);
 156                 return 0;
 157         }
 158
 159         nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
 160
 161         ret = l4proto->to_nfattr(skb, nest_proto, ct);
 162
 163         nf_ct_l4proto_put(l4proto);
 164
 165         NFA_NEST_END(skb, nest_proto);
 166
 167         return ret;
 168
 169 nfattr_failure:
 170         nf_ct_l4proto_put(l4proto);
 171         return -1;
 172 }
 173
 174 static inline int
 175 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 176 {
 177         struct nfattr *nest_helper;
 178         const struct nf_conn_help *help = nfct_help(ct);
 179
 180         if (!help || !help->helper)
 181                 return 0;
 182
 183         nest_helper = NFA_NEST(skb, CTA_HELP);
 184         NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
 185
 186         if (help->helper->to_nfattr)
 187                 help->helper->to_nfattr(skb, ct);
 188
 189         NFA_NEST_END(skb, nest_helper);
 190
 191         return 0;
 192
 193 nfattr_failure:
 194         return -1;
 195 }
 196
 197 #ifdef CONFIG_NF_CT_ACCT
 198 static inline int
 199 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 200                         enum ip_conntrack_dir dir)
 201 {
 202         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 203         struct nfattr *nest_count = NFA_NEST(skb, type);
 204         __be32 tmp;
 205
 206         tmp = htonl(ct->counters[dir].packets);
 207         NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
 208
 209         tmp = htonl(ct->counters[dir].bytes);
 210         NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
 211
 212         NFA_NEST_END(skb, nest_count);
 213
 214         return 0;
 215
 216 nfattr_failure:
 217         return -1;
 218 }
 219 #else
 220 #define ctnetlink_dump_counters(a, b, c) (0)
 221 #endif
 222
 223 #ifdef CONFIG_NF_CONNTRACK_MARK
 224 static inline int
 225 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 226 {
 227         __be32 mark = htonl(ct->mark);
 228
 229         NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
 230         return 0;
 231
 232 nfattr_failure:
 233         return -1;
 234 }
 235 #else
 236 #define ctnetlink_dump_mark(a, b) (0)
 237 #endif
 238
 239 static inline int
 240 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 241 {
 242         __be32 id = htonl(ct->id);
 243         NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
 244         return 0;
 245
 246 nfattr_failure:
 247         return -1;
 248 }
 249
 250 static inline int
 251 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 252 {
 253         __be32 use = htonl(atomic_read(&ct->ct_general.use));
 254
 255         NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
 256         return 0;
 257
 258 nfattr_failure:
 259         return -1;
 260 }
 261
 262 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 263
 264 static int
 265 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 266                     int event, int nowait,
 267                     const struct nf_conn *ct)
 268 {
 269         struct nlmsghdr *nlh;
 270         struct nfgenmsg *nfmsg;
 271         struct nfattr *nest_parms;
 272         unsigned char *b = skb_tail_pointer(skb);
 273
 274         event |= NFNL_SUBSYS_CTNETLINK << 8;
 275         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 276         nfmsg  = NLMSG_DATA(nlh);
 277
 278         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 279         nfmsg->nfgen_family =
 280                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 281         nfmsg->version      = NFNETLINK_V0;
 282         nfmsg->res_id       = 0;
 283
 284         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
 285         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 286                 goto nfattr_failure;
 287         NFA_NEST_END(skb, nest_parms);
 288
 289         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
 290         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 291                 goto nfattr_failure;
 292         NFA_NEST_END(skb, nest_parms);
 293
 294         if (ctnetlink_dump_status(skb, ct) < 0 ||
 295             ctnetlink_dump_timeout(skb, ct) < 0 ||
 296             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 297             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 298             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 299             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 300             ctnetlink_dump_mark(skb, ct) < 0 ||
 301             ctnetlink_dump_id(skb, ct) < 0 ||
 302             ctnetlink_dump_use(skb, ct) < 0)
 303                 goto nfattr_failure;
 304
 305         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 306         return skb->len;
 307
 308 nlmsg_failure:
 309 nfattr_failure:
 310         nlmsg_trim(skb, b);
 311         return -1;
 312 }
 313
 314 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 315 static int ctnetlink_conntrack_event(struct notifier_block *this,
 316                                      unsigned long events, void *ptr)
 317 {
 318         struct nlmsghdr *nlh;
 319         struct nfgenmsg *nfmsg;
 320         struct nfattr *nest_parms;
 321         struct nf_conn *ct = (struct nf_conn *)ptr;
 322         struct sk_buff *skb;
 323         unsigned int type;
 324         sk_buff_data_t b;
 325         unsigned int flags = 0, group;
 326
 327         /* ignore our fake conntrack entry */
 328         if (ct == &nf_conntrack_untracked)
 329                 return NOTIFY_DONE;
 330
 331         if (events & IPCT_DESTROY) {
 332                 type = IPCTNL_MSG_CT_DELETE;
 333                 group = NFNLGRP_CONNTRACK_DESTROY;
 334         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 335                 type = IPCTNL_MSG_CT_NEW;
 336                 flags = NLM_F_CREATE|NLM_F_EXCL;
 337                 group = NFNLGRP_CONNTRACK_NEW;
 338         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 339                 type = IPCTNL_MSG_CT_NEW;
 340                 group = NFNLGRP_CONNTRACK_UPDATE;
 341         } else
 342                 return NOTIFY_DONE;
 343
 344         if (!nfnetlink_has_listeners(group))
 345                 return NOTIFY_DONE;
 346
 347         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 348         if (!skb)
 349                 return NOTIFY_DONE;
 350
 351         b = skb->tail;
 352
 353         type |= NFNL_SUBSYS_CTNETLINK << 8;
 354         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 355         nfmsg = NLMSG_DATA(nlh);
 356
 357         nlh->nlmsg_flags    = flags;
 358         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 359         nfmsg->version  = NFNETLINK_V0;
 360         nfmsg->res_id   = 0;
 361
 362         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
 363         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 364                 goto nfattr_failure;
 365         NFA_NEST_END(skb, nest_parms);
 366
 367         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
 368         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 369                 goto nfattr_failure;
 370         NFA_NEST_END(skb, nest_parms);
 371
 372         if (events & IPCT_DESTROY) {
 373                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 374                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 375                         goto nfattr_failure;
 376         } else {
 377                 if (ctnetlink_dump_status(skb, ct) < 0)
 378                         goto nfattr_failure;
 379
 380                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 381                         goto nfattr_failure;
 382
 383                 if (events & IPCT_PROTOINFO
 384                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 385                         goto nfattr_failure;
 386
 387                 if ((events & IPCT_HELPER || nfct_help(ct))
 388                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 389                         goto nfattr_failure;
 390
 391 #ifdef CONFIG_NF_CONNTRACK_MARK
 392                 if ((events & IPCT_MARK || ct->mark)
 393                     && ctnetlink_dump_mark(skb, ct) < 0)
 394                         goto nfattr_failure;
 395 #endif
 396
 397                 if (events & IPCT_COUNTER_FILLING &&
 398                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 399                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 400                         goto nfattr_failure;
 401         }
 402
 403         nlh->nlmsg_len = skb->tail - b;
 404         nfnetlink_send(skb, 0, group, 0);
 405         return NOTIFY_DONE;
 406
 407 nlmsg_failure:
 408 nfattr_failure:
 409         kfree_skb(skb);
 410         return NOTIFY_DONE;
 411 }
 412 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 413
 414 static int ctnetlink_done(struct netlink_callback *cb)
 415 {
 416         if (cb->args[1])
 417                 nf_ct_put((struct nf_conn *)cb->args[1]);
 418         return 0;
 419 }
 420
 421 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
 422
 423 static int
 424 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 425 {
 426         struct nf_conn *ct, *last;
 427         struct nf_conntrack_tuple_hash *h;
 428         struct list_head *i;
 429         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 430         u_int8_t l3proto = nfmsg->nfgen_family;
 431
 432         read_lock_bh(&nf_conntrack_lock);
 433         last = (struct nf_conn *)cb->args[1];
 434         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 435 restart:
 436                 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
 437                         h = (struct nf_conntrack_tuple_hash *) i;
 438                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 439                                 continue;
 440                         ct = nf_ct_tuplehash_to_ctrack(h);
 441                         /* Dump entries of a given L3 protocol number.
 442                          * If it is not specified, ie. l3proto == 0,
 443                          * then dump everything. */
 444                         if (l3proto && L3PROTO(ct) != l3proto)
 445                                 continue;
 446                         if (cb->args[1]) {
 447                                 if (ct != last)
 448                                         continue;
 449                                 cb->args[1] = 0;
 450                         }
 451                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 452                                                 cb->nlh->nlmsg_seq,
 453                                                 IPCTNL_MSG_CT_NEW,
 454                                                 1, ct) < 0) {
 455                                 nf_conntrack_get(&ct->ct_general);
 456                                 cb->args[1] = (unsigned long)ct;
 457                                 goto out;
 458                         }
 459 #ifdef CONFIG_NF_CT_ACCT
 460                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 461                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 462                                 memset(&ct->counters, 0, sizeof(ct->counters));
 463 #endif
 464                 }
 465                 if (cb->args[1]) {
 466                         cb->args[1] = 0;
 467                         goto restart;
 468                 }
 469         }
 470 out:
 471         read_unlock_bh(&nf_conntrack_lock);
 472         if (last)
 473                 nf_ct_put(last);
 474
 475         return skb->len;
 476 }
 477
 478 static inline int
 479 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
 480 {
 481         struct nfattr *tb[CTA_IP_MAX];
 482         struct nf_conntrack_l3proto *l3proto;
 483         int ret = 0;
 484
 485         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
 486
 487         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 488
 489         if (likely(l3proto->nfattr_to_tuple))
 490                 ret = l3proto->nfattr_to_tuple(tb, tuple);
 491
 492         nf_ct_l3proto_put(l3proto);
 493
 494         return ret;
 495 }
 496
 497 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
 498         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
 499 };
 500
 501 static inline int
 502 ctnetlink_parse_tuple_proto(struct nfattr *attr,
 503                             struct nf_conntrack_tuple *tuple)
 504 {
 505         struct nfattr *tb[CTA_PROTO_MAX];
 506         struct nf_conntrack_l4proto *l4proto;
 507         int ret = 0;
 508
 509         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
 510
 511         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
 512                 return -EINVAL;
 513
 514         if (!tb[CTA_PROTO_NUM-1])
 515                 return -EINVAL;
 516         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
 517
 518         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 519
 520         if (likely(l4proto->nfattr_to_tuple))
 521                 ret = l4proto->nfattr_to_tuple(tb, tuple);
 522
 523         nf_ct_l4proto_put(l4proto);
 524
 525         return ret;
 526 }
 527
 528 static inline int
 529 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
 530                       enum ctattr_tuple type, u_int8_t l3num)
 531 {
 532         struct nfattr *tb[CTA_TUPLE_MAX];
 533         int err;
 534
 535         memset(tuple, 0, sizeof(*tuple));
 536
 537         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
 538
 539         if (!tb[CTA_TUPLE_IP-1])
 540                 return -EINVAL;
 541
 542         tuple->src.l3num = l3num;
 543
 544         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
 545         if (err < 0)
 546                 return err;
 547
 548         if (!tb[CTA_TUPLE_PROTO-1])
 549                 return -EINVAL;
 550
 551         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
 552         if (err < 0)
 553                 return err;
 554
 555         /* orig and expect tuples get DIR_ORIGINAL */
 556         if (type == CTA_TUPLE_REPLY)
 557                 tuple->dst.dir = IP_CT_DIR_REPLY;
 558         else
 559                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 560
 561         return 0;
 562 }
 563
 564 #ifdef CONFIG_NF_NAT_NEEDED
 565 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
 566         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
 567         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
 568 };
 569
 570 static int nfnetlink_parse_nat_proto(struct nfattr *attr,
 571                                      const struct nf_conn *ct,
 572                                      struct nf_nat_range *range)
 573 {
 574         struct nfattr *tb[CTA_PROTONAT_MAX];
 575         struct nf_nat_protocol *npt;
 576
 577         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
 578
 579         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
 580                 return -EINVAL;
 581
 582         npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 583
 584         if (!npt->nfattr_to_range) {
 585                 nf_nat_proto_put(npt);
 586                 return 0;
 587         }
 588
 589         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
 590         if (npt->nfattr_to_range(tb, range) > 0)
 591                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
 592
 593         nf_nat_proto_put(npt);
 594
 595         return 0;
 596 }
 597
 598 static const size_t cta_min_nat[CTA_NAT_MAX] = {
 599         [CTA_NAT_MINIP-1]       = sizeof(u_int32_t),
 600         [CTA_NAT_MAXIP-1]       = sizeof(u_int32_t),
 601 };
 602
 603 static inline int
 604 nfnetlink_parse_nat(struct nfattr *nat,
 605                     const struct nf_conn *ct, struct nf_nat_range *range)
 606 {
 607         struct nfattr *tb[CTA_NAT_MAX];
 608         int err;
 609
 610         memset(range, 0, sizeof(*range));
 611
 612         nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
 613
 614         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
 615                 return -EINVAL;
 616
 617         if (tb[CTA_NAT_MINIP-1])
 618                 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
 619
 620         if (!tb[CTA_NAT_MAXIP-1])
 621                 range->max_ip = range->min_ip;
 622         else
 623                 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
 624
 625         if (range->min_ip)
 626                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 627
 628         if (!tb[CTA_NAT_PROTO-1])
 629                 return 0;
 630
 631         err = nfnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
 632         if (err < 0)
 633                 return err;
 634
 635         return 0;
 636 }
 637 #endif
 638
 639 static inline int
 640 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
 641 {
 642         struct nfattr *tb[CTA_HELP_MAX];
 643
 644         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
 645
 646         if (!tb[CTA_HELP_NAME-1])
 647                 return -EINVAL;
 648
 649         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
 650
 651         return 0;
 652 }
 653
 654 static const size_t cta_min[CTA_MAX] = {
 655         [CTA_STATUS-1]          = sizeof(u_int32_t),
 656         [CTA_TIMEOUT-1]         = sizeof(u_int32_t),
 657         [CTA_MARK-1]            = sizeof(u_int32_t),
 658         [CTA_USE-1]             = sizeof(u_int32_t),
 659         [CTA_ID-1]              = sizeof(u_int32_t)
 660 };
 661
 662 static int
 663 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 664                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
 665 {
 666         struct nf_conntrack_tuple_hash *h;
 667         struct nf_conntrack_tuple tuple;
 668         struct nf_conn *ct;
 669         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 670         u_int8_t u3 = nfmsg->nfgen_family;
 671         int err = 0;
 672
 673         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
 674                 return -EINVAL;
 675
 676         if (cda[CTA_TUPLE_ORIG-1])
 677                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 678         else if (cda[CTA_TUPLE_REPLY-1])
 679                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 680         else {
 681                 /* Flush the whole table */
 682                 nf_conntrack_flush();
 683                 return 0;
 684         }
 685
 686         if (err < 0)
 687                 return err;
 688
 689         h = nf_conntrack_find_get(&tuple, NULL);
 690         if (!h)
 691                 return -ENOENT;
 692
 693         ct = nf_ct_tuplehash_to_ctrack(h);
 694
 695         if (cda[CTA_ID-1]) {
 696                 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
 697                 if (ct->id != id) {
 698                         nf_ct_put(ct);
 699                         return -ENOENT;
 700                 }
 701         }
 702         if (del_timer(&ct->timeout))
 703                 ct->timeout.function((unsigned long)ct);
 704
 705         nf_ct_put(ct);
 706
 707         return 0;
 708 }
 709
 710 static int
 711 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 712                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
 713 {
 714         struct nf_conntrack_tuple_hash *h;
 715         struct nf_conntrack_tuple tuple;
 716         struct nf_conn *ct;
 717         struct sk_buff *skb2 = NULL;
 718         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 719         u_int8_t u3 = nfmsg->nfgen_family;
 720         int err = 0;
 721
 722         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 723                 u32 rlen;
 724
 725 #ifndef CONFIG_NF_CT_ACCT
 726                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 727                         return -ENOTSUPP;
 728 #endif
 729                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
 730                                                 ctnetlink_dump_table,
 731                                                 ctnetlink_done)) != 0)
 732                         return -EINVAL;
 733
 734                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 735                 if (rlen > skb->len)
 736                         rlen = skb->len;
 737                 skb_pull(skb, rlen);
 738                 return 0;
 739         }
 740
 741         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
 742                 return -EINVAL;
 743
 744         if (cda[CTA_TUPLE_ORIG-1])
 745                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 746         else if (cda[CTA_TUPLE_REPLY-1])
 747                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 748         else
 749                 return -EINVAL;
 750
 751         if (err < 0)
 752                 return err;
 753
 754         h = nf_conntrack_find_get(&tuple, NULL);
 755         if (!h)
 756                 return -ENOENT;
 757
 758         ct = nf_ct_tuplehash_to_ctrack(h);
 759
 760         err = -ENOMEM;
 761         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 762         if (!skb2) {
 763                 nf_ct_put(ct);
 764                 return -ENOMEM;
 765         }
 766
 767         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 768                                   IPCTNL_MSG_CT_NEW, 1, ct);
 769         nf_ct_put(ct);
 770         if (err <= 0)
 771                 goto free;
 772
 773         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 774         if (err < 0)
 775                 goto out;
 776
 777         return 0;
 778
 779 free:
 780         kfree_skb(skb2);
 781 out:
 782         return err;
 783 }
 784
 785 static inline int
 786 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
 787 {
 788         unsigned long d;
 789         unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
 790         d = ct->status ^ status;
 791
 792         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 793                 /* unchangeable */
 794                 return -EINVAL;
 795
 796         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 797                 /* SEEN_REPLY bit can only be set */
 798                 return -EINVAL;
 799
 800
 801         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 802                 /* ASSURED bit can only be set */
 803                 return -EINVAL;
 804
 805         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
 806 #ifndef CONFIG_NF_NAT_NEEDED
 807                 return -EINVAL;
 808 #else
 809                 struct nf_nat_range range;
 810
 811                 if (cda[CTA_NAT_DST-1]) {
 812                         if (nfnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
 813                                                 &range) < 0)
 814                                 return -EINVAL;
 815                         if (nf_nat_initialized(ct,
 816                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
 817                                 return -EEXIST;
 818                         nf_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
 819                 }
 820                 if (cda[CTA_NAT_SRC-1]) {
 821                         if (nfnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
 822                                                 &range) < 0)
 823                                 return -EINVAL;
 824                         if (nf_nat_initialized(ct,
 825                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
 826                                 return -EEXIST;
 827                         nf_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
 828                 }
 829 #endif
 830         }
 831
 832         /* Be careful here, modifying NAT bits can screw up things,
 833          * so don't let users modify them directly if they don't pass
 834          * nf_nat_range. */
 835         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 836         return 0;
 837 }
 838
 839
 840 static inline int
 841 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
 842 {
 843         struct nf_conntrack_helper *helper;
 844         struct nf_conn_help *help = nfct_help(ct);
 845         char *helpname;
 846         int err;
 847
 848         if (!help) {
 849                 /* FIXME: we need to reallocate and rehash */
 850                 return -EBUSY;
 851         }
 852
 853         /* don't change helper of sibling connections */
 854         if (ct->master)
 855                 return -EINVAL;
 856
 857         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
 858         if (err < 0)
 859                 return err;
 860
 861         helper = __nf_conntrack_helper_find_byname(helpname);
 862         if (!helper) {
 863                 if (!strcmp(helpname, ""))
 864                         helper = NULL;
 865                 else
 866                         return -EINVAL;
 867         }
 868
 869         if (help->helper) {
 870                 if (!helper) {
 871                         /* we had a helper before ... */
 872                         nf_ct_remove_expectations(ct);
 873                         help->helper = NULL;
 874                 } else {
 875                         /* need to zero data of old helper */
 876                         memset(&help->help, 0, sizeof(help->help));
 877                 }
 878         }
 879
 880         help->helper = helper;
 881
 882         return 0;
 883 }
 884
 885 static inline int
 886 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
 887 {
 888         u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
 889
 890         if (!del_timer(&ct->timeout))
 891                 return -ETIME;
 892
 893         ct->timeout.expires = jiffies + timeout * HZ;
 894         add_timer(&ct->timeout);
 895
 896         return 0;
 897 }
 898
 899 static inline int
 900 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
 901 {
 902         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
 903         struct nf_conntrack_l4proto *l4proto;
 904         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
 905         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 906         int err = 0;
 907
 908         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
 909
 910         l4proto = nf_ct_l4proto_find_get(l3num, npt);
 911
 912         if (l4proto->from_nfattr)
 913                 err = l4proto->from_nfattr(tb, ct);
 914         nf_ct_l4proto_put(l4proto);
 915
 916         return err;
 917 }
 918
 919 static int
 920 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
 921 {
 922         int err;
 923
 924         if (cda[CTA_HELP-1]) {
 925                 err = ctnetlink_change_helper(ct, cda);
 926                 if (err < 0)
 927                         return err;
 928         }
 929
 930         if (cda[CTA_TIMEOUT-1]) {
 931                 err = ctnetlink_change_timeout(ct, cda);
 932                 if (err < 0)
 933                         return err;
 934         }
 935
 936         if (cda[CTA_STATUS-1]) {
 937                 err = ctnetlink_change_status(ct, cda);
 938                 if (err < 0)
 939                         return err;
 940         }
 941
 942         if (cda[CTA_PROTOINFO-1]) {
 943                 err = ctnetlink_change_protoinfo(ct, cda);
 944                 if (err < 0)
 945                         return err;
 946         }
 947
 948 #if defined(CONFIG_NF_CONNTRACK_MARK)
 949         if (cda[CTA_MARK-1])
 950                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
 951 #endif
 952
 953         return 0;
 954 }
 955
 956 static int
 957 ctnetlink_create_conntrack(struct nfattr *cda[],
 958                            struct nf_conntrack_tuple *otuple,
 959                            struct nf_conntrack_tuple *rtuple)
 960 {
 961         struct nf_conn *ct;
 962         int err = -EINVAL;
 963         struct nf_conn_help *help;
 964
 965         ct = nf_conntrack_alloc(otuple, rtuple);
 966         if (ct == NULL || IS_ERR(ct))
 967                 return -ENOMEM;
 968
 969         if (!cda[CTA_TIMEOUT-1])
 970                 goto err;
 971         ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
 972
 973         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
 974         ct->status |= IPS_CONFIRMED;
 975
 976         if (cda[CTA_STATUS-1]) {
 977                 err = ctnetlink_change_status(ct, cda);
 978                 if (err < 0)
 979                         goto err;
 980         }
 981
 982         if (cda[CTA_PROTOINFO-1]) {
 983                 err = ctnetlink_change_protoinfo(ct, cda);
 984                 if (err < 0)
 985                         goto err;
 986         }
 987
 988 #if defined(CONFIG_NF_CONNTRACK_MARK)
 989         if (cda[CTA_MARK-1])
 990                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
 991 #endif
 992
 993         help = nfct_help(ct);
 994         if (help)
 995                 help->helper = nf_ct_helper_find_get(rtuple);
 996
 997         add_timer(&ct->timeout);
 998         nf_conntrack_hash_insert(ct);
 999
1000         if (help && help->helper)
1001                 nf_ct_helper_put(help->helper);
1002
1003         return 0;
1004
1005 err:
1006         nf_conntrack_free(ct);
1007         return err;
1008 }
1009
1010 static int
1011 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1012                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1013 {
1014         struct nf_conntrack_tuple otuple, rtuple;
1015         struct nf_conntrack_tuple_hash *h = NULL;
1016         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1017         u_int8_t u3 = nfmsg->nfgen_family;
1018         int err = 0;
1019
1020         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1021                 return -EINVAL;
1022
1023         if (cda[CTA_TUPLE_ORIG-1]) {
1024                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1025                 if (err < 0)
1026                         return err;
1027         }
1028
1029         if (cda[CTA_TUPLE_REPLY-1]) {
1030                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1031                 if (err < 0)
1032                         return err;
1033         }
1034
1035         write_lock_bh(&nf_conntrack_lock);
1036         if (cda[CTA_TUPLE_ORIG-1])
1037                 h = __nf_conntrack_find(&otuple, NULL);
1038         else if (cda[CTA_TUPLE_REPLY-1])
1039                 h = __nf_conntrack_find(&rtuple, NULL);
1040
1041         if (h == NULL) {
1042                 write_unlock_bh(&nf_conntrack_lock);
1043                 err = -ENOENT;
1044                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1045                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1046                 return err;
1047         }
1048         /* implicit 'else' */
1049
1050         /* we only allow nat config for new conntracks */
1051         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1052                 err = -EINVAL;
1053                 goto out_unlock;
1054         }
1055
1056         /* We manipulate the conntrack inside the global conntrack table lock,
1057          * so there's no need to increase the refcount */
1058         err = -EEXIST;
1059         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1060                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1061
1062 out_unlock:
1063         write_unlock_bh(&nf_conntrack_lock);
1064         return err;
1065 }
1066
1067 /***********************************************************************
1068  * EXPECT
1069  ***********************************************************************/
1070
1071 static inline int
1072 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1073                          const struct nf_conntrack_tuple *tuple,
1074                          enum ctattr_expect type)
1075 {
1076         struct nfattr *nest_parms = NFA_NEST(skb, type);
1077
1078         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1079                 goto nfattr_failure;
1080
1081         NFA_NEST_END(skb, nest_parms);
1082
1083         return 0;
1084
1085 nfattr_failure:
1086         return -1;
1087 }
1088
1089 static inline int
1090 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1091                         const struct nf_conntrack_tuple *tuple,
1092                         const struct nf_conntrack_tuple *mask)
1093 {
1094         int ret;
1095         struct nf_conntrack_l3proto *l3proto;
1096         struct nf_conntrack_l4proto *l4proto;
1097         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1098
1099         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1100         ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1101         nf_ct_l3proto_put(l3proto);
1102
1103         if (unlikely(ret < 0))
1104                 goto nfattr_failure;
1105
1106         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1107         ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
1108         nf_ct_l4proto_put(l4proto);
1109         if (unlikely(ret < 0))
1110                 goto nfattr_failure;
1111
1112         NFA_NEST_END(skb, nest_parms);
1113
1114         return 0;
1115
1116 nfattr_failure:
1117         return -1;
1118 }
1119
1120 static inline int
1121 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1122                           const struct nf_conntrack_expect *exp)
1123 {
1124         struct nf_conn *master = exp->master;
1125         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1126         __be32 id = htonl(exp->id);
1127
1128         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1129                 goto nfattr_failure;
1130         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1131                 goto nfattr_failure;
1132         if (ctnetlink_exp_dump_tuple(skb,
1133                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1134                                  CTA_EXPECT_MASTER) < 0)
1135                 goto nfattr_failure;
1136
1137         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1138         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1139
1140         return 0;
1141
1142 nfattr_failure:
1143         return -1;
1144 }
1145
1146 static int
1147 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1148                     int event,
1149                     int nowait,
1150                     const struct nf_conntrack_expect *exp)
1151 {
1152         struct nlmsghdr *nlh;
1153         struct nfgenmsg *nfmsg;
1154         unsigned char *b = skb_tail_pointer(skb);
1155
1156         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1157         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1158         nfmsg  = NLMSG_DATA(nlh);
1159
1160         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1161         nfmsg->nfgen_family = exp->tuple.src.l3num;
1162         nfmsg->version      = NFNETLINK_V0;
1163         nfmsg->res_id       = 0;
1164
1165         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1166                 goto nfattr_failure;
1167
1168         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1169         return skb->len;
1170
1171 nlmsg_failure:
1172 nfattr_failure:
1173         nlmsg_trim(skb, b);
1174         return -1;
1175 }
1176
1177 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1178 static int ctnetlink_expect_event(struct notifier_block *this,
1179                                   unsigned long events, void *ptr)
1180 {
1181         struct nlmsghdr *nlh;
1182         struct nfgenmsg *nfmsg;
1183         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1184         struct sk_buff *skb;
1185         unsigned int type;
1186         sk_buff_data_t b;
1187         int flags = 0;
1188
1189         if (events & IPEXP_NEW) {
1190                 type = IPCTNL_MSG_EXP_NEW;
1191                 flags = NLM_F_CREATE|NLM_F_EXCL;
1192         } else
1193                 return NOTIFY_DONE;
1194
1195         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1196                 return NOTIFY_DONE;
1197
1198         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1199         if (!skb)
1200                 return NOTIFY_DONE;
1201
1202         b = skb->tail;
1203
1204         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1205         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1206         nfmsg = NLMSG_DATA(nlh);
1207
1208         nlh->nlmsg_flags    = flags;
1209         nfmsg->nfgen_family = exp->tuple.src.l3num;
1210         nfmsg->version      = NFNETLINK_V0;
1211         nfmsg->res_id       = 0;
1212
1213         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1214                 goto nfattr_failure;
1215
1216         nlh->nlmsg_len = skb->tail - b;
1217         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1218         return NOTIFY_DONE;
1219
1220 nlmsg_failure:
1221 nfattr_failure:
1222         kfree_skb(skb);
1223         return NOTIFY_DONE;
1224 }
1225 #endif
1226
1227 static int
1228 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1229 {
1230         struct nf_conntrack_expect *exp = NULL;
1231         struct list_head *i;
1232         u_int32_t *id = (u_int32_t *) &cb->args[0];
1233         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1234         u_int8_t l3proto = nfmsg->nfgen_family;
1235
1236         read_lock_bh(&nf_conntrack_lock);
1237         list_for_each_prev(i, &nf_conntrack_expect_list) {
1238                 exp = (struct nf_conntrack_expect *) i;
1239                 if (l3proto && exp->tuple.src.l3num != l3proto)
1240                         continue;
1241                 if (exp->id <= *id)
1242                         continue;
1243                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1244                                             cb->nlh->nlmsg_seq,
1245                                             IPCTNL_MSG_EXP_NEW,
1246                                             1, exp) < 0)
1247                         goto out;
1248                 *id = exp->id;
1249         }
1250 out:
1251         read_unlock_bh(&nf_conntrack_lock);
1252
1253         return skb->len;
1254 }
1255
1256 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1257         [CTA_EXPECT_TIMEOUT-1]          = sizeof(u_int32_t),
1258         [CTA_EXPECT_ID-1]               = sizeof(u_int32_t)
1259 };
1260
1261 static int
1262 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1263                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1264 {
1265         struct nf_conntrack_tuple tuple;
1266         struct nf_conntrack_expect *exp;
1267         struct sk_buff *skb2;
1268         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1269         u_int8_t u3 = nfmsg->nfgen_family;
1270         int err = 0;
1271
1272         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1273                 return -EINVAL;
1274
1275         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1276                 u32 rlen;
1277
1278                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1279                                                 ctnetlink_exp_dump_table,
1280                                                 ctnetlink_done)) != 0)
1281                         return -EINVAL;
1282                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1283                 if (rlen > skb->len)
1284                         rlen = skb->len;
1285                 skb_pull(skb, rlen);
1286                 return 0;
1287         }
1288
1289         if (cda[CTA_EXPECT_MASTER-1])
1290                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1291         else
1292                 return -EINVAL;
1293
1294         if (err < 0)
1295                 return err;
1296
1297         exp = nf_conntrack_expect_find_get(&tuple);
1298         if (!exp)
1299                 return -ENOENT;
1300
1301         if (cda[CTA_EXPECT_ID-1]) {
1302                 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1303                 if (exp->id != ntohl(id)) {
1304                         nf_conntrack_expect_put(exp);
1305                         return -ENOENT;
1306                 }
1307         }
1308
1309         err = -ENOMEM;
1310         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1311         if (!skb2)
1312                 goto out;
1313
1314         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1315                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1316                                       1, exp);
1317         if (err <= 0)
1318                 goto free;
1319
1320         nf_conntrack_expect_put(exp);
1321
1322         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1323
1324 free:
1325         kfree_skb(skb2);
1326 out:
1327         nf_conntrack_expect_put(exp);
1328         return err;
1329 }
1330
1331 static int
1332 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1333                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1334 {
1335         struct nf_conntrack_expect *exp, *tmp;
1336         struct nf_conntrack_tuple tuple;
1337         struct nf_conntrack_helper *h;
1338         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1339         u_int8_t u3 = nfmsg->nfgen_family;
1340         int err;
1341
1342         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1343                 return -EINVAL;
1344
1345         if (cda[CTA_EXPECT_TUPLE-1]) {
1346                 /* delete a single expect by tuple */
1347                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1348                 if (err < 0)
1349                         return err;
1350
1351                 /* bump usage count to 2 */
1352                 exp = nf_conntrack_expect_find_get(&tuple);
1353                 if (!exp)
1354                         return -ENOENT;
1355
1356                 if (cda[CTA_EXPECT_ID-1]) {
1357                         __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1358                         if (exp->id != ntohl(id)) {
1359                                 nf_conntrack_expect_put(exp);
1360                                 return -ENOENT;
1361                         }
1362                 }
1363
1364                 /* after list removal, usage count == 1 */
1365                 nf_conntrack_unexpect_related(exp);
1366                 /* have to put what we 'get' above.
1367                  * after this line usage count == 0 */
1368                 nf_conntrack_expect_put(exp);
1369         } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1370                 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1371
1372                 /* delete all expectations for this helper */
1373                 write_lock_bh(&nf_conntrack_lock);
1374                 h = __nf_conntrack_helper_find_byname(name);
1375                 if (!h) {
1376                         write_unlock_bh(&nf_conntrack_lock);
1377                         return -EINVAL;
1378                 }
1379                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1380                                          list) {
1381                         struct nf_conn_help *m_help = nfct_help(exp->master);
1382                         if (m_help->helper == h
1383                             && del_timer(&exp->timeout)) {
1384                                 nf_ct_unlink_expect(exp);
1385                                 nf_conntrack_expect_put(exp);
1386                         }
1387                 }
1388                 write_unlock_bh(&nf_conntrack_lock);
1389         } else {
1390                 /* This basically means we have to flush everything*/
1391                 write_lock_bh(&nf_conntrack_lock);
1392                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1393                                          list) {
1394                         if (del_timer(&exp->timeout)) {
1395                                 nf_ct_unlink_expect(exp);
1396                                 nf_conntrack_expect_put(exp);
1397                         }
1398                 }
1399                 write_unlock_bh(&nf_conntrack_lock);
1400         }
1401
1402         return 0;
1403 }
1404 static int
1405 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1406 {
1407         return -EOPNOTSUPP;
1408 }
1409
1410 static int
1411 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1412 {
1413         struct nf_conntrack_tuple tuple, mask, master_tuple;
1414         struct nf_conntrack_tuple_hash *h = NULL;
1415         struct nf_conntrack_expect *exp;
1416         struct nf_conn *ct;
1417         struct nf_conn_help *help;
1418         int err = 0;
1419
1420         /* caller guarantees that those three CTA_EXPECT_* exist */
1421         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1422         if (err < 0)
1423                 return err;
1424         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1425         if (err < 0)
1426                 return err;
1427         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1428         if (err < 0)
1429                 return err;
1430
1431         /* Look for master conntrack of this expectation */
1432         h = nf_conntrack_find_get(&master_tuple, NULL);
1433         if (!h)
1434                 return -ENOENT;
1435         ct = nf_ct_tuplehash_to_ctrack(h);
1436         help = nfct_help(ct);
1437
1438         if (!help || !help->helper) {
1439                 /* such conntrack hasn't got any helper, abort */
1440                 err = -EINVAL;
1441                 goto out;
1442         }
1443
1444         exp = nf_conntrack_expect_alloc(ct);
1445         if (!exp) {
1446                 err = -ENOMEM;
1447                 goto out;
1448         }
1449
1450         exp->expectfn = NULL;
1451         exp->flags = 0;
1452         exp->master = ct;
1453         exp->helper = NULL;
1454         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1455         memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1456
1457         err = nf_conntrack_expect_related(exp);
1458         nf_conntrack_expect_put(exp);
1459
1460 out:
1461         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1462         return err;
1463 }
1464
1465 static int
1466 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1467                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1468 {
1469         struct nf_conntrack_tuple tuple;
1470         struct nf_conntrack_expect *exp;
1471         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1472         u_int8_t u3 = nfmsg->nfgen_family;
1473         int err = 0;
1474
1475         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1476                 return -EINVAL;
1477
1478         if (!cda[CTA_EXPECT_TUPLE-1]
1479             || !cda[CTA_EXPECT_MASK-1]
1480             || !cda[CTA_EXPECT_MASTER-1])
1481                 return -EINVAL;
1482
1483         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1484         if (err < 0)
1485                 return err;
1486
1487         write_lock_bh(&nf_conntrack_lock);
1488         exp = __nf_conntrack_expect_find(&tuple);
1489
1490         if (!exp) {
1491                 write_unlock_bh(&nf_conntrack_lock);
1492                 err = -ENOENT;
1493                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1494                         err = ctnetlink_create_expect(cda, u3);
1495                 return err;
1496         }
1497
1498         err = -EEXIST;
1499         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1500                 err = ctnetlink_change_expect(exp, cda);
1501         write_unlock_bh(&nf_conntrack_lock);
1502
1503         return err;
1504 }
1505
1506 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1507 static struct notifier_block ctnl_notifier = {
1508         .notifier_call  = ctnetlink_conntrack_event,
1509 };
1510
1511 static struct notifier_block ctnl_notifier_exp = {
1512         .notifier_call  = ctnetlink_expect_event,
1513 };
1514 #endif
1515
1516 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1517         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1518                                             .attr_count = CTA_MAX, },
1519         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1520                                             .attr_count = CTA_MAX, },
1521         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1522                                             .attr_count = CTA_MAX, },
1523         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1524                                             .attr_count = CTA_MAX, },
1525 };
1526
1527 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1528         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1529                                             .attr_count = CTA_EXPECT_MAX, },
1530         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1531                                             .attr_count = CTA_EXPECT_MAX, },
1532         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1533                                             .attr_count = CTA_EXPECT_MAX, },
1534 };
1535
1536 static struct nfnetlink_subsystem ctnl_subsys = {
1537         .name                           = "conntrack",
1538         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1539         .cb_count                       = IPCTNL_MSG_MAX,
1540         .cb                             = ctnl_cb,
1541 };
1542
1543 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1544         .name                           = "conntrack_expect",
1545         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1546         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1547         .cb                             = ctnl_exp_cb,
1548 };
1549
1550 MODULE_ALIAS("ip_conntrack_netlink");
1551 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1552 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1553
1554 static int __init ctnetlink_init(void)
1555 {
1556         int ret;
1557
1558         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1559         ret = nfnetlink_subsys_register(&ctnl_subsys);
1560         if (ret < 0) {
1561                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1562                 goto err_out;
1563         }
1564
1565         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1566         if (ret < 0) {
1567                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1568                 goto err_unreg_subsys;
1569         }
1570
1571 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1572         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1573         if (ret < 0) {
1574                 printk("ctnetlink_init: cannot register notifier.\n");
1575                 goto err_unreg_exp_subsys;
1576         }
1577
1578         ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1579         if (ret < 0) {
1580                 printk("ctnetlink_init: cannot expect register notifier.\n");
1581                 goto err_unreg_notifier;
1582         }
1583 #endif
1584
1585         return 0;
1586
1587 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1588 err_unreg_notifier:
1589         nf_conntrack_unregister_notifier(&ctnl_notifier);
1590 err_unreg_exp_subsys:
1591         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1592 #endif
1593 err_unreg_subsys:
1594         nfnetlink_subsys_unregister(&ctnl_subsys);
1595 err_out:
1596         return ret;
1597 }
1598
1599 static void __exit ctnetlink_exit(void)
1600 {
1601         printk("ctnetlink: unregistering from nfnetlink.\n");
1602
1603 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1604         nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1605         nf_conntrack_unregister_notifier(&ctnl_notifier);
1606 #endif
1607
1608         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1609         nfnetlink_subsys_unregister(&ctnl_subsys);
1610         return;
1611 }
1612
1613 module_init(ctnetlink_init);
1614 module_exit(ctnetlink_exit);