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/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_core.h>
  38 #include <net/netfilter/nf_conntrack_expect.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40 #include <net/netfilter/nf_conntrack_l3proto.h>
  41 #include <net/netfilter/nf_conntrack_l4proto.h>
  42 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
  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 nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_PROTO);
  58
  59         NFA_PUT(skb, CTA_PROTO_NUM, sizeof(u_int8_t), &tuple->dst.protonum);
  60
  61         if (likely(l4proto->tuple_to_nfattr))
  62                 ret = l4proto->tuple_to_nfattr(skb, tuple);
  63
  64         NFA_NEST_END(skb, nest_parms);
  65
  66         return ret;
  67
  68 nfattr_failure:
  69         return -1;
  70 }
  71
  72 static inline int
  73 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  74                          const struct nf_conntrack_tuple *tuple,
  75                          struct nf_conntrack_l3proto *l3proto)
  76 {
  77         int ret = 0;
  78         struct nfattr *nest_parms = NFA_NEST(skb, CTA_TUPLE_IP);
  79
  80         if (likely(l3proto->tuple_to_nfattr))
  81                 ret = l3proto->tuple_to_nfattr(skb, tuple);
  82
  83         NFA_NEST_END(skb, nest_parms);
  84
  85         return ret;
  86
  87 nfattr_failure:
  88         return -1;
  89 }
  90
  91 static inline int
  92 ctnetlink_dump_tuples(struct sk_buff *skb,
  93                       const struct nf_conntrack_tuple *tuple)
  94 {
  95         int ret;
  96         struct nf_conntrack_l3proto *l3proto;
  97         struct nf_conntrack_l4proto *l4proto;
  98
  99         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 100         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 101         nf_ct_l3proto_put(l3proto);
 102
 103         if (unlikely(ret < 0))
 104                 return ret;
 105
 106         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 107         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 108         nf_ct_l4proto_put(l4proto);
 109
 110         return ret;
 111 }
 112
 113 static inline int
 114 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 115 {
 116         __be32 status = htonl((u_int32_t) ct->status);
 117         NFA_PUT(skb, CTA_STATUS, sizeof(status), &status);
 118         return 0;
 119
 120 nfattr_failure:
 121         return -1;
 122 }
 123
 124 static inline int
 125 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 126 {
 127         long timeout_l = ct->timeout.expires - jiffies;
 128         __be32 timeout;
 129
 130         if (timeout_l < 0)
 131                 timeout = 0;
 132         else
 133                 timeout = htonl(timeout_l / HZ);
 134
 135         NFA_PUT(skb, CTA_TIMEOUT, sizeof(timeout), &timeout);
 136         return 0;
 137
 138 nfattr_failure:
 139         return -1;
 140 }
 141
 142 static inline int
 143 ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 144 {
 145         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);
 146         struct nfattr *nest_proto;
 147         int ret;
 148
 149         if (!l4proto->to_nfattr) {
 150                 nf_ct_l4proto_put(l4proto);
 151                 return 0;
 152         }
 153
 154         nest_proto = NFA_NEST(skb, CTA_PROTOINFO);
 155
 156         ret = l4proto->to_nfattr(skb, nest_proto, ct);
 157
 158         nf_ct_l4proto_put(l4proto);
 159
 160         NFA_NEST_END(skb, nest_proto);
 161
 162         return ret;
 163
 164 nfattr_failure:
 165         nf_ct_l4proto_put(l4proto);
 166         return -1;
 167 }
 168
 169 static inline int
 170 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 171 {
 172         struct nfattr *nest_helper;
 173         const struct nf_conn_help *help = nfct_help(ct);
 174
 175         if (!help || !help->helper)
 176                 return 0;
 177
 178         nest_helper = NFA_NEST(skb, CTA_HELP);
 179         NFA_PUT(skb, CTA_HELP_NAME, strlen(help->helper->name), help->helper->name);
 180
 181         if (help->helper->to_nfattr)
 182                 help->helper->to_nfattr(skb, ct);
 183
 184         NFA_NEST_END(skb, nest_helper);
 185
 186         return 0;
 187
 188 nfattr_failure:
 189         return -1;
 190 }
 191
 192 #ifdef CONFIG_NF_CT_ACCT
 193 static inline int
 194 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 195                         enum ip_conntrack_dir dir)
 196 {
 197         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 198         struct nfattr *nest_count = NFA_NEST(skb, type);
 199         __be32 tmp;
 200
 201         tmp = htonl(ct->counters[dir].packets);
 202         NFA_PUT(skb, CTA_COUNTERS32_PACKETS, sizeof(u_int32_t), &tmp);
 203
 204         tmp = htonl(ct->counters[dir].bytes);
 205         NFA_PUT(skb, CTA_COUNTERS32_BYTES, sizeof(u_int32_t), &tmp);
 206
 207         NFA_NEST_END(skb, nest_count);
 208
 209         return 0;
 210
 211 nfattr_failure:
 212         return -1;
 213 }
 214 #else
 215 #define ctnetlink_dump_counters(a, b, c) (0)
 216 #endif
 217
 218 #ifdef CONFIG_NF_CONNTRACK_MARK
 219 static inline int
 220 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 221 {
 222         __be32 mark = htonl(ct->mark);
 223
 224         NFA_PUT(skb, CTA_MARK, sizeof(u_int32_t), &mark);
 225         return 0;
 226
 227 nfattr_failure:
 228         return -1;
 229 }
 230 #else
 231 #define ctnetlink_dump_mark(a, b) (0)
 232 #endif
 233
 234 static inline int
 235 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 236 {
 237         __be32 id = htonl(ct->id);
 238         NFA_PUT(skb, CTA_ID, sizeof(u_int32_t), &id);
 239         return 0;
 240
 241 nfattr_failure:
 242         return -1;
 243 }
 244
 245 static inline int
 246 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 247 {
 248         __be32 use = htonl(atomic_read(&ct->ct_general.use));
 249
 250         NFA_PUT(skb, CTA_USE, sizeof(u_int32_t), &use);
 251         return 0;
 252
 253 nfattr_failure:
 254         return -1;
 255 }
 256
 257 #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 258
 259 static int
 260 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 261                     int event, int nowait,
 262                     const struct nf_conn *ct)
 263 {
 264         struct nlmsghdr *nlh;
 265         struct nfgenmsg *nfmsg;
 266         struct nfattr *nest_parms;
 267         unsigned char *b;
 268
 269         b = skb->tail;
 270
 271         event |= NFNL_SUBSYS_CTNETLINK << 8;
 272         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 273         nfmsg  = NLMSG_DATA(nlh);
 274
 275         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 276         nfmsg->nfgen_family =
 277                 ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 278         nfmsg->version      = NFNETLINK_V0;
 279         nfmsg->res_id       = 0;
 280
 281         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
 282         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 283                 goto nfattr_failure;
 284         NFA_NEST_END(skb, nest_parms);
 285
 286         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
 287         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 288                 goto nfattr_failure;
 289         NFA_NEST_END(skb, nest_parms);
 290
 291         if (ctnetlink_dump_status(skb, ct) < 0 ||
 292             ctnetlink_dump_timeout(skb, ct) < 0 ||
 293             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 294             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 295             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 296             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 297             ctnetlink_dump_mark(skb, ct) < 0 ||
 298             ctnetlink_dump_id(skb, ct) < 0 ||
 299             ctnetlink_dump_use(skb, ct) < 0)
 300                 goto nfattr_failure;
 301
 302         nlh->nlmsg_len = skb->tail - b;
 303         return skb->len;
 304
 305 nlmsg_failure:
 306 nfattr_failure:
 307         skb_trim(skb, b - skb->data);
 308         return -1;
 309 }
 310
 311 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 312 static int ctnetlink_conntrack_event(struct notifier_block *this,
 313                                      unsigned long events, void *ptr)
 314 {
 315         struct nlmsghdr *nlh;
 316         struct nfgenmsg *nfmsg;
 317         struct nfattr *nest_parms;
 318         struct nf_conn *ct = (struct nf_conn *)ptr;
 319         struct sk_buff *skb;
 320         unsigned int type;
 321         unsigned char *b;
 322         unsigned int flags = 0, group;
 323
 324         /* ignore our fake conntrack entry */
 325         if (ct == &nf_conntrack_untracked)
 326                 return NOTIFY_DONE;
 327
 328         if (events & IPCT_DESTROY) {
 329                 type = IPCTNL_MSG_CT_DELETE;
 330                 group = NFNLGRP_CONNTRACK_DESTROY;
 331         } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 332                 type = IPCTNL_MSG_CT_NEW;
 333                 flags = NLM_F_CREATE|NLM_F_EXCL;
 334                 group = NFNLGRP_CONNTRACK_NEW;
 335         } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 336                 type = IPCTNL_MSG_CT_NEW;
 337                 group = NFNLGRP_CONNTRACK_UPDATE;
 338         } else
 339                 return NOTIFY_DONE;
 340
 341         if (!nfnetlink_has_listeners(group))
 342                 return NOTIFY_DONE;
 343
 344         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 345         if (!skb)
 346                 return NOTIFY_DONE;
 347
 348         b = skb->tail;
 349
 350         type |= NFNL_SUBSYS_CTNETLINK << 8;
 351         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 352         nfmsg = NLMSG_DATA(nlh);
 353
 354         nlh->nlmsg_flags    = flags;
 355         nfmsg->nfgen_family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 356         nfmsg->version  = NFNETLINK_V0;
 357         nfmsg->res_id   = 0;
 358
 359         nest_parms = NFA_NEST(skb, CTA_TUPLE_ORIG);
 360         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 361                 goto nfattr_failure;
 362         NFA_NEST_END(skb, nest_parms);
 363
 364         nest_parms = NFA_NEST(skb, CTA_TUPLE_REPLY);
 365         if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 366                 goto nfattr_failure;
 367         NFA_NEST_END(skb, nest_parms);
 368
 369         if (events & IPCT_DESTROY) {
 370                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 371                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 372                         goto nfattr_failure;
 373         } else {
 374                 if (ctnetlink_dump_status(skb, ct) < 0)
 375                         goto nfattr_failure;
 376
 377                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 378                         goto nfattr_failure;
 379
 380                 if (events & IPCT_PROTOINFO
 381                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 382                         goto nfattr_failure;
 383
 384                 if ((events & IPCT_HELPER || nfct_help(ct))
 385                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 386                         goto nfattr_failure;
 387
 388                 if ((events & IPCT_MARK || ct->mark)
 389                     && ctnetlink_dump_mark(skb, ct) < 0)
 390                         goto nfattr_failure;
 391
 392                 if (events & IPCT_COUNTER_FILLING &&
 393                     (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 394                      ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0))
 395                         goto nfattr_failure;
 396         }
 397
 398         nlh->nlmsg_len = skb->tail - b;
 399         nfnetlink_send(skb, 0, group, 0);
 400         return NOTIFY_DONE;
 401
 402 nlmsg_failure:
 403 nfattr_failure:
 404         kfree_skb(skb);
 405         return NOTIFY_DONE;
 406 }
 407 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 408
 409 static int ctnetlink_done(struct netlink_callback *cb)
 410 {
 411         if (cb->args[1])
 412                 nf_ct_put((struct nf_conn *)cb->args[1]);
 413         return 0;
 414 }
 415
 416 #define L3PROTO(ct) ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num
 417
 418 static int
 419 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 420 {
 421         struct nf_conn *ct, *last;
 422         struct nf_conntrack_tuple_hash *h;
 423         struct list_head *i;
 424         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 425         u_int8_t l3proto = nfmsg->nfgen_family;
 426
 427         read_lock_bh(&nf_conntrack_lock);
 428         last = (struct nf_conn *)cb->args[1];
 429         for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 430 restart:
 431                 list_for_each_prev(i, &nf_conntrack_hash[cb->args[0]]) {
 432                         h = (struct nf_conntrack_tuple_hash *) i;
 433                         if (DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 434                                 continue;
 435                         ct = nf_ct_tuplehash_to_ctrack(h);
 436                         /* Dump entries of a given L3 protocol number.
 437                          * If it is not specified, ie. l3proto == 0,
 438                          * then dump everything. */
 439                         if (l3proto && L3PROTO(ct) != l3proto)
 440                                 continue;
 441                         if (cb->args[1]) {
 442                                 if (ct != last)
 443                                         continue;
 444                                 cb->args[1] = 0;
 445                         }
 446                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 447                                                 cb->nlh->nlmsg_seq,
 448                                                 IPCTNL_MSG_CT_NEW,
 449                                                 1, ct) < 0) {
 450                                 nf_conntrack_get(&ct->ct_general);
 451                                 cb->args[1] = (unsigned long)ct;
 452                                 goto out;
 453                         }
 454 #ifdef CONFIG_NF_CT_ACCT
 455                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 456                                                 IPCTNL_MSG_CT_GET_CTRZERO)
 457                                 memset(&ct->counters, 0, sizeof(ct->counters));
 458 #endif
 459                 }
 460                 if (cb->args[1]) {
 461                         cb->args[1] = 0;
 462                         goto restart;
 463                 }
 464         }
 465 out:
 466         read_unlock_bh(&nf_conntrack_lock);
 467         if (last)
 468                 nf_ct_put(last);
 469
 470         return skb->len;
 471 }
 472
 473 static inline int
 474 ctnetlink_parse_tuple_ip(struct nfattr *attr, struct nf_conntrack_tuple *tuple)
 475 {
 476         struct nfattr *tb[CTA_IP_MAX];
 477         struct nf_conntrack_l3proto *l3proto;
 478         int ret = 0;
 479
 480         nfattr_parse_nested(tb, CTA_IP_MAX, attr);
 481
 482         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 483
 484         if (likely(l3proto->nfattr_to_tuple))
 485                 ret = l3proto->nfattr_to_tuple(tb, tuple);
 486
 487         nf_ct_l3proto_put(l3proto);
 488
 489         return ret;
 490 }
 491
 492 static const size_t cta_min_proto[CTA_PROTO_MAX] = {
 493         [CTA_PROTO_NUM-1]       = sizeof(u_int8_t),
 494 };
 495
 496 static inline int
 497 ctnetlink_parse_tuple_proto(struct nfattr *attr,
 498                             struct nf_conntrack_tuple *tuple)
 499 {
 500         struct nfattr *tb[CTA_PROTO_MAX];
 501         struct nf_conntrack_l4proto *l4proto;
 502         int ret = 0;
 503
 504         nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
 505
 506         if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
 507                 return -EINVAL;
 508
 509         if (!tb[CTA_PROTO_NUM-1])
 510                 return -EINVAL;
 511         tuple->dst.protonum = *(u_int8_t *)NFA_DATA(tb[CTA_PROTO_NUM-1]);
 512
 513         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 514
 515         if (likely(l4proto->nfattr_to_tuple))
 516                 ret = l4proto->nfattr_to_tuple(tb, tuple);
 517
 518         nf_ct_l4proto_put(l4proto);
 519
 520         return ret;
 521 }
 522
 523 static inline int
 524 ctnetlink_parse_tuple(struct nfattr *cda[], struct nf_conntrack_tuple *tuple,
 525                       enum ctattr_tuple type, u_int8_t l3num)
 526 {
 527         struct nfattr *tb[CTA_TUPLE_MAX];
 528         int err;
 529
 530         memset(tuple, 0, sizeof(*tuple));
 531
 532         nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
 533
 534         if (!tb[CTA_TUPLE_IP-1])
 535                 return -EINVAL;
 536
 537         tuple->src.l3num = l3num;
 538
 539         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP-1], tuple);
 540         if (err < 0)
 541                 return err;
 542
 543         if (!tb[CTA_TUPLE_PROTO-1])
 544                 return -EINVAL;
 545
 546         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO-1], tuple);
 547         if (err < 0)
 548                 return err;
 549
 550         /* orig and expect tuples get DIR_ORIGINAL */
 551         if (type == CTA_TUPLE_REPLY)
 552                 tuple->dst.dir = IP_CT_DIR_REPLY;
 553         else
 554                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 555
 556         return 0;
 557 }
 558
 559 #ifdef CONFIG_IP_NF_NAT_NEEDED
 560 static const size_t cta_min_protonat[CTA_PROTONAT_MAX] = {
 561         [CTA_PROTONAT_PORT_MIN-1]       = sizeof(u_int16_t),
 562         [CTA_PROTONAT_PORT_MAX-1]       = sizeof(u_int16_t),
 563 };
 564
 565 static int ctnetlink_parse_nat_proto(struct nfattr *attr,
 566                                      const struct nf_conn *ct,
 567                                      struct ip_nat_range *range)
 568 {
 569         struct nfattr *tb[CTA_PROTONAT_MAX];
 570         struct ip_nat_protocol *npt;
 571
 572         nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
 573
 574         if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
 575                 return -EINVAL;
 576
 577         npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 578
 579         if (!npt->nfattr_to_range) {
 580                 ip_nat_proto_put(npt);
 581                 return 0;
 582         }
 583
 584         /* nfattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
 585         if (npt->nfattr_to_range(tb, range) > 0)
 586                 range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
 587
 588         ip_nat_proto_put(npt);
 589
 590         return 0;
 591 }
 592
 593 static const size_t cta_min_nat[CTA_NAT_MAX] = {
 594         [CTA_NAT_MINIP-1]       = sizeof(u_int32_t),
 595         [CTA_NAT_MAXIP-1]       = sizeof(u_int32_t),
 596 };
 597
 598 static inline int
 599 ctnetlink_parse_nat(struct nfattr *nat,
 600                     const struct nf_conn *ct, struct ip_nat_range *range)
 601 {
 602         struct nfattr *tb[CTA_NAT_MAX];
 603         int err;
 604
 605         memset(range, 0, sizeof(*range));
 606
 607         nfattr_parse_nested(tb, CTA_NAT_MAX, nat);
 608
 609         if (nfattr_bad_size(tb, CTA_NAT_MAX, cta_min_nat))
 610                 return -EINVAL;
 611
 612         if (tb[CTA_NAT_MINIP-1])
 613                 range->min_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
 614
 615         if (!tb[CTA_NAT_MAXIP-1])
 616                 range->max_ip = range->min_ip;
 617         else
 618                 range->max_ip = *(__be32 *)NFA_DATA(tb[CTA_NAT_MAXIP-1]);
 619
 620         if (range->min_ip)
 621                 range->flags |= IP_NAT_RANGE_MAP_IPS;
 622
 623         if (!tb[CTA_NAT_PROTO-1])
 624                 return 0;
 625
 626         err = ctnetlink_parse_nat_proto(tb[CTA_NAT_PROTO-1], ct, range);
 627         if (err < 0)
 628                 return err;
 629
 630         return 0;
 631 }
 632 #endif
 633
 634 static inline int
 635 ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
 636 {
 637         struct nfattr *tb[CTA_HELP_MAX];
 638
 639         nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
 640
 641         if (!tb[CTA_HELP_NAME-1])
 642                 return -EINVAL;
 643
 644         *helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
 645
 646         return 0;
 647 }
 648
 649 static const size_t cta_min[CTA_MAX] = {
 650         [CTA_STATUS-1]          = sizeof(u_int32_t),
 651         [CTA_TIMEOUT-1]         = sizeof(u_int32_t),
 652         [CTA_MARK-1]            = sizeof(u_int32_t),
 653         [CTA_USE-1]             = sizeof(u_int32_t),
 654         [CTA_ID-1]              = sizeof(u_int32_t)
 655 };
 656
 657 static int
 658 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 659                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
 660 {
 661         struct nf_conntrack_tuple_hash *h;
 662         struct nf_conntrack_tuple tuple;
 663         struct nf_conn *ct;
 664         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 665         u_int8_t u3 = nfmsg->nfgen_family;
 666         int err = 0;
 667
 668         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
 669                 return -EINVAL;
 670
 671         if (cda[CTA_TUPLE_ORIG-1])
 672                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 673         else if (cda[CTA_TUPLE_REPLY-1])
 674                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 675         else {
 676                 /* Flush the whole table */
 677                 nf_conntrack_flush();
 678                 return 0;
 679         }
 680
 681         if (err < 0)
 682                 return err;
 683
 684         h = nf_conntrack_find_get(&tuple, NULL);
 685         if (!h)
 686                 return -ENOENT;
 687
 688         ct = nf_ct_tuplehash_to_ctrack(h);
 689
 690         if (cda[CTA_ID-1]) {
 691                 u_int32_t id = ntohl(*(__be32 *)NFA_DATA(cda[CTA_ID-1]));
 692                 if (ct->id != id) {
 693                         nf_ct_put(ct);
 694                         return -ENOENT;
 695                 }
 696         }
 697         if (del_timer(&ct->timeout))
 698                 ct->timeout.function((unsigned long)ct);
 699
 700         nf_ct_put(ct);
 701
 702         return 0;
 703 }
 704
 705 static int
 706 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 707                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
 708 {
 709         struct nf_conntrack_tuple_hash *h;
 710         struct nf_conntrack_tuple tuple;
 711         struct nf_conn *ct;
 712         struct sk_buff *skb2 = NULL;
 713         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 714         u_int8_t u3 = nfmsg->nfgen_family;
 715         int err = 0;
 716
 717         if (nlh->nlmsg_flags & NLM_F_DUMP) {
 718                 u32 rlen;
 719
 720 #ifndef CONFIG_NF_CT_ACCT
 721                 if (NFNL_MSG_TYPE(nlh->nlmsg_type) == IPCTNL_MSG_CT_GET_CTRZERO)
 722                         return -ENOTSUPP;
 723 #endif
 724                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
 725                                                 ctnetlink_dump_table,
 726                                                 ctnetlink_done)) != 0)
 727                         return -EINVAL;
 728
 729                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
 730                 if (rlen > skb->len)
 731                         rlen = skb->len;
 732                 skb_pull(skb, rlen);
 733                 return 0;
 734         }
 735
 736         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
 737                 return -EINVAL;
 738
 739         if (cda[CTA_TUPLE_ORIG-1])
 740                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 741         else if (cda[CTA_TUPLE_REPLY-1])
 742                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 743         else
 744                 return -EINVAL;
 745
 746         if (err < 0)
 747                 return err;
 748
 749         h = nf_conntrack_find_get(&tuple, NULL);
 750         if (!h)
 751                 return -ENOENT;
 752
 753         ct = nf_ct_tuplehash_to_ctrack(h);
 754
 755         err = -ENOMEM;
 756         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 757         if (!skb2) {
 758                 nf_ct_put(ct);
 759                 return -ENOMEM;
 760         }
 761
 762         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 763                                   IPCTNL_MSG_CT_NEW, 1, ct);
 764         nf_ct_put(ct);
 765         if (err <= 0)
 766                 goto free;
 767
 768         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 769         if (err < 0)
 770                 goto out;
 771
 772         return 0;
 773
 774 free:
 775         kfree_skb(skb2);
 776 out:
 777         return err;
 778 }
 779
 780 static inline int
 781 ctnetlink_change_status(struct nf_conn *ct, struct nfattr *cda[])
 782 {
 783         unsigned long d;
 784         unsigned int status = ntohl(*(__be32 *)NFA_DATA(cda[CTA_STATUS-1]));
 785         d = ct->status ^ status;
 786
 787         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 788                 /* unchangeable */
 789                 return -EINVAL;
 790
 791         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 792                 /* SEEN_REPLY bit can only be set */
 793                 return -EINVAL;
 794
 795
 796         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 797                 /* ASSURED bit can only be set */
 798                 return -EINVAL;
 799
 800         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
 801 #ifndef CONFIG_IP_NF_NAT_NEEDED
 802                 return -EINVAL;
 803 #else
 804                 struct ip_nat_range range;
 805
 806                 if (cda[CTA_NAT_DST-1]) {
 807                         if (ctnetlink_parse_nat(cda[CTA_NAT_DST-1], ct,
 808                                                 &range) < 0)
 809                                 return -EINVAL;
 810                         if (ip_nat_initialized(ct,
 811                                                HOOK2MANIP(NF_IP_PRE_ROUTING)))
 812                                 return -EEXIST;
 813                         ip_nat_setup_info(ct, &range, hooknum);
 814                 }
 815                 if (cda[CTA_NAT_SRC-1]) {
 816                         if (ctnetlink_parse_nat(cda[CTA_NAT_SRC-1], ct,
 817                                                 &range) < 0)
 818                                 return -EINVAL;
 819                         if (ip_nat_initialized(ct,
 820                                                HOOK2MANIP(NF_IP_POST_ROUTING)))
 821                                 return -EEXIST;
 822                         ip_nat_setup_info(ct, &range, hooknum);
 823                 }
 824 #endif
 825         }
 826
 827         /* Be careful here, modifying NAT bits can screw up things,
 828          * so don't let users modify them directly if they don't pass
 829          * ip_nat_range. */
 830         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 831         return 0;
 832 }
 833
 834
 835 static inline int
 836 ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[])
 837 {
 838         struct nf_conntrack_helper *helper;
 839         struct nf_conn_help *help = nfct_help(ct);
 840         char *helpname;
 841         int err;
 842
 843         if (!help) {
 844                 /* FIXME: we need to reallocate and rehash */
 845                 return -EBUSY;
 846         }
 847
 848         /* don't change helper of sibling connections */
 849         if (ct->master)
 850                 return -EINVAL;
 851
 852         err = ctnetlink_parse_help(cda[CTA_HELP-1], &helpname);
 853         if (err < 0)
 854                 return err;
 855
 856         helper = __nf_conntrack_helper_find_byname(helpname);
 857         if (!helper) {
 858                 if (!strcmp(helpname, ""))
 859                         helper = NULL;
 860                 else
 861                         return -EINVAL;
 862         }
 863
 864         if (help->helper) {
 865                 if (!helper) {
 866                         /* we had a helper before ... */
 867                         nf_ct_remove_expectations(ct);
 868                         help->helper = NULL;
 869                 } else {
 870                         /* need to zero data of old helper */
 871                         memset(&help->help, 0, sizeof(help->help));
 872                 }
 873         }
 874
 875         help->helper = helper;
 876
 877         return 0;
 878 }
 879
 880 static inline int
 881 ctnetlink_change_timeout(struct nf_conn *ct, struct nfattr *cda[])
 882 {
 883         u_int32_t timeout = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
 884
 885         if (!del_timer(&ct->timeout))
 886                 return -ETIME;
 887
 888         ct->timeout.expires = jiffies + timeout * HZ;
 889         add_timer(&ct->timeout);
 890
 891         return 0;
 892 }
 893
 894 static inline int
 895 ctnetlink_change_protoinfo(struct nf_conn *ct, struct nfattr *cda[])
 896 {
 897         struct nfattr *tb[CTA_PROTOINFO_MAX], *attr = cda[CTA_PROTOINFO-1];
 898         struct nf_conntrack_l4proto *l4proto;
 899         u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
 900         u_int16_t l3num = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
 901         int err = 0;
 902
 903         nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
 904
 905         l4proto = nf_ct_l4proto_find_get(l3num, npt);
 906
 907         if (l4proto->from_nfattr)
 908                 err = l4proto->from_nfattr(tb, ct);
 909         nf_ct_l4proto_put(l4proto);
 910
 911         return err;
 912 }
 913
 914 static int
 915 ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[])
 916 {
 917         int err;
 918
 919         if (cda[CTA_HELP-1]) {
 920                 err = ctnetlink_change_helper(ct, cda);
 921                 if (err < 0)
 922                         return err;
 923         }
 924
 925         if (cda[CTA_TIMEOUT-1]) {
 926                 err = ctnetlink_change_timeout(ct, cda);
 927                 if (err < 0)
 928                         return err;
 929         }
 930
 931         if (cda[CTA_STATUS-1]) {
 932                 err = ctnetlink_change_status(ct, cda);
 933                 if (err < 0)
 934                         return err;
 935         }
 936
 937         if (cda[CTA_PROTOINFO-1]) {
 938                 err = ctnetlink_change_protoinfo(ct, cda);
 939                 if (err < 0)
 940                         return err;
 941         }
 942
 943 #if defined(CONFIG_NF_CONNTRACK_MARK)
 944         if (cda[CTA_MARK-1])
 945                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
 946 #endif
 947
 948         return 0;
 949 }
 950
 951 static int
 952 ctnetlink_create_conntrack(struct nfattr *cda[],
 953                            struct nf_conntrack_tuple *otuple,
 954                            struct nf_conntrack_tuple *rtuple)
 955 {
 956         struct nf_conn *ct;
 957         int err = -EINVAL;
 958         struct nf_conn_help *help;
 959
 960         ct = nf_conntrack_alloc(otuple, rtuple);
 961         if (ct == NULL || IS_ERR(ct))
 962                 return -ENOMEM;
 963
 964         if (!cda[CTA_TIMEOUT-1])
 965                 goto err;
 966         ct->timeout.expires = ntohl(*(__be32 *)NFA_DATA(cda[CTA_TIMEOUT-1]));
 967
 968         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
 969         ct->status |= IPS_CONFIRMED;
 970
 971         if (cda[CTA_STATUS-1]) {
 972                 err = ctnetlink_change_status(ct, cda);
 973                 if (err < 0)
 974                         goto err;
 975         }
 976
 977         if (cda[CTA_PROTOINFO-1]) {
 978                 err = ctnetlink_change_protoinfo(ct, cda);
 979                 if (err < 0)
 980                         return err;
 981         }
 982
 983 #if defined(CONFIG_NF_CONNTRACK_MARK)
 984         if (cda[CTA_MARK-1])
 985                 ct->mark = ntohl(*(__be32 *)NFA_DATA(cda[CTA_MARK-1]));
 986 #endif
 987
 988         help = nfct_help(ct);
 989         if (help)
 990                 help->helper = nf_ct_helper_find_get(rtuple);
 991
 992         add_timer(&ct->timeout);
 993         nf_conntrack_hash_insert(ct);
 994
 995         if (help && help->helper)
 996                 nf_ct_helper_put(help->helper);
 997
 998         return 0;
 999
1000 err:
1001         nf_conntrack_free(ct);
1002         return err;
1003 }
1004
1005 static int
1006 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1007                         struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1008 {
1009         struct nf_conntrack_tuple otuple, rtuple;
1010         struct nf_conntrack_tuple_hash *h = NULL;
1011         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1012         u_int8_t u3 = nfmsg->nfgen_family;
1013         int err = 0;
1014
1015         if (nfattr_bad_size(cda, CTA_MAX, cta_min))
1016                 return -EINVAL;
1017
1018         if (cda[CTA_TUPLE_ORIG-1]) {
1019                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1020                 if (err < 0)
1021                         return err;
1022         }
1023
1024         if (cda[CTA_TUPLE_REPLY-1]) {
1025                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1026                 if (err < 0)
1027                         return err;
1028         }
1029
1030         write_lock_bh(&nf_conntrack_lock);
1031         if (cda[CTA_TUPLE_ORIG-1])
1032                 h = __nf_conntrack_find(&otuple, NULL);
1033         else if (cda[CTA_TUPLE_REPLY-1])
1034                 h = __nf_conntrack_find(&rtuple, NULL);
1035
1036         if (h == NULL) {
1037                 write_unlock_bh(&nf_conntrack_lock);
1038                 err = -ENOENT;
1039                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1040                         err = ctnetlink_create_conntrack(cda, &otuple, &rtuple);
1041                 return err;
1042         }
1043         /* implicit 'else' */
1044
1045         /* we only allow nat config for new conntracks */
1046         if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
1047                 err = -EINVAL;
1048                 goto out_unlock;
1049         }
1050
1051         /* We manipulate the conntrack inside the global conntrack table lock,
1052          * so there's no need to increase the refcount */
1053         err = -EEXIST;
1054         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1055                 err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
1056
1057 out_unlock:
1058         write_unlock_bh(&nf_conntrack_lock);
1059         return err;
1060 }
1061
1062 /***********************************************************************
1063  * EXPECT
1064  ***********************************************************************/
1065
1066 static inline int
1067 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1068                          const struct nf_conntrack_tuple *tuple,
1069                          enum ctattr_expect type)
1070 {
1071         struct nfattr *nest_parms = NFA_NEST(skb, type);
1072
1073         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1074                 goto nfattr_failure;
1075
1076         NFA_NEST_END(skb, nest_parms);
1077
1078         return 0;
1079
1080 nfattr_failure:
1081         return -1;
1082 }
1083
1084 static inline int
1085 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1086                         const struct nf_conntrack_tuple *tuple,
1087                         const struct nf_conntrack_tuple *mask)
1088 {
1089         int ret;
1090         struct nf_conntrack_l3proto *l3proto;
1091         struct nf_conntrack_l4proto *l4proto;
1092         struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
1093
1094         l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1095         ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
1096         nf_ct_l3proto_put(l3proto);
1097
1098         if (unlikely(ret < 0))
1099                 goto nfattr_failure;
1100
1101         l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1102         ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
1103         nf_ct_l4proto_put(l4proto);
1104         if (unlikely(ret < 0))
1105                 goto nfattr_failure;
1106
1107         NFA_NEST_END(skb, nest_parms);
1108
1109         return 0;
1110
1111 nfattr_failure:
1112         return -1;
1113 }
1114
1115 static inline int
1116 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1117                           const struct nf_conntrack_expect *exp)
1118 {
1119         struct nf_conn *master = exp->master;
1120         __be32 timeout = htonl((exp->timeout.expires - jiffies) / HZ);
1121         __be32 id = htonl(exp->id);
1122
1123         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1124                 goto nfattr_failure;
1125         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1126                 goto nfattr_failure;
1127         if (ctnetlink_exp_dump_tuple(skb,
1128                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1129                                  CTA_EXPECT_MASTER) < 0)
1130                 goto nfattr_failure;
1131
1132         NFA_PUT(skb, CTA_EXPECT_TIMEOUT, sizeof(timeout), &timeout);
1133         NFA_PUT(skb, CTA_EXPECT_ID, sizeof(u_int32_t), &id);
1134
1135         return 0;
1136
1137 nfattr_failure:
1138         return -1;
1139 }
1140
1141 static int
1142 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1143                     int event,
1144                     int nowait,
1145                     const struct nf_conntrack_expect *exp)
1146 {
1147         struct nlmsghdr *nlh;
1148         struct nfgenmsg *nfmsg;
1149         unsigned char *b;
1150
1151         b = skb->tail;
1152
1153         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1154         nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1155         nfmsg  = NLMSG_DATA(nlh);
1156
1157         nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1158         nfmsg->nfgen_family = exp->tuple.src.l3num;
1159         nfmsg->version      = NFNETLINK_V0;
1160         nfmsg->res_id       = 0;
1161
1162         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1163                 goto nfattr_failure;
1164
1165         nlh->nlmsg_len = skb->tail - b;
1166         return skb->len;
1167
1168 nlmsg_failure:
1169 nfattr_failure:
1170         skb_trim(skb, b - skb->data);
1171         return -1;
1172 }
1173
1174 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1175 static int ctnetlink_expect_event(struct notifier_block *this,
1176                                   unsigned long events, void *ptr)
1177 {
1178         struct nlmsghdr *nlh;
1179         struct nfgenmsg *nfmsg;
1180         struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1181         struct sk_buff *skb;
1182         unsigned int type;
1183         unsigned char *b;
1184         int flags = 0;
1185
1186         if (events & IPEXP_NEW) {
1187                 type = IPCTNL_MSG_EXP_NEW;
1188                 flags = NLM_F_CREATE|NLM_F_EXCL;
1189         } else
1190                 return NOTIFY_DONE;
1191
1192         if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1193                 return NOTIFY_DONE;
1194
1195         skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1196         if (!skb)
1197                 return NOTIFY_DONE;
1198
1199         b = skb->tail;
1200
1201         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1202         nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1203         nfmsg = NLMSG_DATA(nlh);
1204
1205         nlh->nlmsg_flags    = flags;
1206         nfmsg->nfgen_family = exp->tuple.src.l3num;
1207         nfmsg->version      = NFNETLINK_V0;
1208         nfmsg->res_id       = 0;
1209
1210         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1211                 goto nfattr_failure;
1212
1213         nlh->nlmsg_len = skb->tail - b;
1214         nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1215         return NOTIFY_DONE;
1216
1217 nlmsg_failure:
1218 nfattr_failure:
1219         kfree_skb(skb);
1220         return NOTIFY_DONE;
1221 }
1222 #endif
1223
1224 static int
1225 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1226 {
1227         struct nf_conntrack_expect *exp = NULL;
1228         struct list_head *i;
1229         u_int32_t *id = (u_int32_t *) &cb->args[0];
1230         struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1231         u_int8_t l3proto = nfmsg->nfgen_family;
1232
1233         read_lock_bh(&nf_conntrack_lock);
1234         list_for_each_prev(i, &nf_conntrack_expect_list) {
1235                 exp = (struct nf_conntrack_expect *) i;
1236                 if (l3proto && exp->tuple.src.l3num != l3proto)
1237                         continue;
1238                 if (exp->id <= *id)
1239                         continue;
1240                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1241                                             cb->nlh->nlmsg_seq,
1242                                             IPCTNL_MSG_EXP_NEW,
1243                                             1, exp) < 0)
1244                         goto out;
1245                 *id = exp->id;
1246         }
1247 out:
1248         read_unlock_bh(&nf_conntrack_lock);
1249
1250         return skb->len;
1251 }
1252
1253 static const size_t cta_min_exp[CTA_EXPECT_MAX] = {
1254         [CTA_EXPECT_TIMEOUT-1]          = sizeof(u_int32_t),
1255         [CTA_EXPECT_ID-1]               = sizeof(u_int32_t)
1256 };
1257
1258 static int
1259 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1260                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1261 {
1262         struct nf_conntrack_tuple tuple;
1263         struct nf_conntrack_expect *exp;
1264         struct sk_buff *skb2;
1265         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1266         u_int8_t u3 = nfmsg->nfgen_family;
1267         int err = 0;
1268
1269         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1270                 return -EINVAL;
1271
1272         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1273                 u32 rlen;
1274
1275                 if ((*errp = netlink_dump_start(ctnl, skb, nlh,
1276                                                 ctnetlink_exp_dump_table,
1277                                                 ctnetlink_done)) != 0)
1278                         return -EINVAL;
1279                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1280                 if (rlen > skb->len)
1281                         rlen = skb->len;
1282                 skb_pull(skb, rlen);
1283                 return 0;
1284         }
1285
1286         if (cda[CTA_EXPECT_MASTER-1])
1287                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1288         else
1289                 return -EINVAL;
1290
1291         if (err < 0)
1292                 return err;
1293
1294         exp = nf_conntrack_expect_find_get(&tuple);
1295         if (!exp)
1296                 return -ENOENT;
1297
1298         if (cda[CTA_EXPECT_ID-1]) {
1299                 __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1300                 if (exp->id != ntohl(id)) {
1301                         nf_conntrack_expect_put(exp);
1302                         return -ENOENT;
1303                 }
1304         }
1305
1306         err = -ENOMEM;
1307         skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1308         if (!skb2)
1309                 goto out;
1310
1311         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1312                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1313                                       1, exp);
1314         if (err <= 0)
1315                 goto free;
1316
1317         nf_conntrack_expect_put(exp);
1318
1319         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1320
1321 free:
1322         kfree_skb(skb2);
1323 out:
1324         nf_conntrack_expect_put(exp);
1325         return err;
1326 }
1327
1328 static int
1329 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1330                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1331 {
1332         struct nf_conntrack_expect *exp, *tmp;
1333         struct nf_conntrack_tuple tuple;
1334         struct nf_conntrack_helper *h;
1335         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1336         u_int8_t u3 = nfmsg->nfgen_family;
1337         int err;
1338
1339         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1340                 return -EINVAL;
1341
1342         if (cda[CTA_EXPECT_TUPLE-1]) {
1343                 /* delete a single expect by tuple */
1344                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1345                 if (err < 0)
1346                         return err;
1347
1348                 /* bump usage count to 2 */
1349                 exp = nf_conntrack_expect_find_get(&tuple);
1350                 if (!exp)
1351                         return -ENOENT;
1352
1353                 if (cda[CTA_EXPECT_ID-1]) {
1354                         __be32 id = *(__be32 *)NFA_DATA(cda[CTA_EXPECT_ID-1]);
1355                         if (exp->id != ntohl(id)) {
1356                                 nf_conntrack_expect_put(exp);
1357                                 return -ENOENT;
1358                         }
1359                 }
1360
1361                 /* after list removal, usage count == 1 */
1362                 nf_conntrack_unexpect_related(exp);
1363                 /* have to put what we 'get' above.
1364                  * after this line usage count == 0 */
1365                 nf_conntrack_expect_put(exp);
1366         } else if (cda[CTA_EXPECT_HELP_NAME-1]) {
1367                 char *name = NFA_DATA(cda[CTA_EXPECT_HELP_NAME-1]);
1368
1369                 /* delete all expectations for this helper */
1370                 write_lock_bh(&nf_conntrack_lock);
1371                 h = __nf_conntrack_helper_find_byname(name);
1372                 if (!h) {
1373                         write_unlock_bh(&nf_conntrack_lock);
1374                         return -EINVAL;
1375                 }
1376                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1377                                          list) {
1378                         struct nf_conn_help *m_help = nfct_help(exp->master);
1379                         if (m_help->helper == h
1380                             && del_timer(&exp->timeout)) {
1381                                 nf_ct_unlink_expect(exp);
1382                                 nf_conntrack_expect_put(exp);
1383                         }
1384                 }
1385                 write_unlock_bh(&nf_conntrack_lock);
1386         } else {
1387                 /* This basically means we have to flush everything*/
1388                 write_lock_bh(&nf_conntrack_lock);
1389                 list_for_each_entry_safe(exp, tmp, &nf_conntrack_expect_list,
1390                                          list) {
1391                         if (del_timer(&exp->timeout)) {
1392                                 nf_ct_unlink_expect(exp);
1393                                 nf_conntrack_expect_put(exp);
1394                         }
1395                 }
1396                 write_unlock_bh(&nf_conntrack_lock);
1397         }
1398
1399         return 0;
1400 }
1401 static int
1402 ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nfattr *cda[])
1403 {
1404         return -EOPNOTSUPP;
1405 }
1406
1407 static int
1408 ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
1409 {
1410         struct nf_conntrack_tuple tuple, mask, master_tuple;
1411         struct nf_conntrack_tuple_hash *h = NULL;
1412         struct nf_conntrack_expect *exp;
1413         struct nf_conn *ct;
1414         struct nf_conn_help *help;
1415         int err = 0;
1416
1417         /* caller guarantees that those three CTA_EXPECT_* exist */
1418         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1419         if (err < 0)
1420                 return err;
1421         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1422         if (err < 0)
1423                 return err;
1424         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1425         if (err < 0)
1426                 return err;
1427
1428         /* Look for master conntrack of this expectation */
1429         h = nf_conntrack_find_get(&master_tuple, NULL);
1430         if (!h)
1431                 return -ENOENT;
1432         ct = nf_ct_tuplehash_to_ctrack(h);
1433         help = nfct_help(ct);
1434
1435         if (!help || !help->helper) {
1436                 /* such conntrack hasn't got any helper, abort */
1437                 err = -EINVAL;
1438                 goto out;
1439         }
1440
1441         exp = nf_conntrack_expect_alloc(ct);
1442         if (!exp) {
1443                 err = -ENOMEM;
1444                 goto out;
1445         }
1446
1447         exp->expectfn = NULL;
1448         exp->flags = 0;
1449         exp->master = ct;
1450         exp->helper = NULL;
1451         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1452         memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
1453
1454         err = nf_conntrack_expect_related(exp);
1455         nf_conntrack_expect_put(exp);
1456
1457 out:
1458         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1459         return err;
1460 }
1461
1462 static int
1463 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1464                      struct nlmsghdr *nlh, struct nfattr *cda[], int *errp)
1465 {
1466         struct nf_conntrack_tuple tuple;
1467         struct nf_conntrack_expect *exp;
1468         struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1469         u_int8_t u3 = nfmsg->nfgen_family;
1470         int err = 0;
1471
1472         if (nfattr_bad_size(cda, CTA_EXPECT_MAX, cta_min_exp))
1473                 return -EINVAL;
1474
1475         if (!cda[CTA_EXPECT_TUPLE-1]
1476             || !cda[CTA_EXPECT_MASK-1]
1477             || !cda[CTA_EXPECT_MASTER-1])
1478                 return -EINVAL;
1479
1480         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1481         if (err < 0)
1482                 return err;
1483
1484         write_lock_bh(&nf_conntrack_lock);
1485         exp = __nf_conntrack_expect_find(&tuple);
1486
1487         if (!exp) {
1488                 write_unlock_bh(&nf_conntrack_lock);
1489                 err = -ENOENT;
1490                 if (nlh->nlmsg_flags & NLM_F_CREATE)
1491                         err = ctnetlink_create_expect(cda, u3);
1492                 return err;
1493         }
1494
1495         err = -EEXIST;
1496         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1497                 err = ctnetlink_change_expect(exp, cda);
1498         write_unlock_bh(&nf_conntrack_lock);
1499
1500         return err;
1501 }
1502
1503 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1504 static struct notifier_block ctnl_notifier = {
1505         .notifier_call  = ctnetlink_conntrack_event,
1506 };
1507
1508 static struct notifier_block ctnl_notifier_exp = {
1509         .notifier_call  = ctnetlink_expect_event,
1510 };
1511 #endif
1512
1513 static struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1514         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1515                                             .attr_count = CTA_MAX, },
1516         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1517                                             .attr_count = CTA_MAX, },
1518         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1519                                             .attr_count = CTA_MAX, },
1520         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1521                                             .attr_count = CTA_MAX, },
1522 };
1523
1524 static struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1525         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1526                                             .attr_count = CTA_EXPECT_MAX, },
1527         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1528                                             .attr_count = CTA_EXPECT_MAX, },
1529         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1530                                             .attr_count = CTA_EXPECT_MAX, },
1531 };
1532
1533 static struct nfnetlink_subsystem ctnl_subsys = {
1534         .name                           = "conntrack",
1535         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1536         .cb_count                       = IPCTNL_MSG_MAX,
1537         .cb                             = ctnl_cb,
1538 };
1539
1540 static struct nfnetlink_subsystem ctnl_exp_subsys = {
1541         .name                           = "conntrack_expect",
1542         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1543         .cb_count                       = IPCTNL_MSG_EXP_MAX,
1544         .cb                             = ctnl_exp_cb,
1545 };
1546
1547 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1548 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1549
1550 static int __init ctnetlink_init(void)
1551 {
1552         int ret;
1553
1554         printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1555         ret = nfnetlink_subsys_register(&ctnl_subsys);
1556         if (ret < 0) {
1557                 printk("ctnetlink_init: cannot register with nfnetlink.\n");
1558                 goto err_out;
1559         }
1560
1561         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1562         if (ret < 0) {
1563                 printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1564                 goto err_unreg_subsys;
1565         }
1566
1567 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1568         ret = nf_conntrack_register_notifier(&ctnl_notifier);
1569         if (ret < 0) {
1570                 printk("ctnetlink_init: cannot register notifier.\n");
1571                 goto err_unreg_exp_subsys;
1572         }
1573
1574         ret = nf_conntrack_expect_register_notifier(&ctnl_notifier_exp);
1575         if (ret < 0) {
1576                 printk("ctnetlink_init: cannot expect register notifier.\n");
1577                 goto err_unreg_notifier;
1578         }
1579 #endif
1580
1581         return 0;
1582
1583 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1584 err_unreg_notifier:
1585         nf_conntrack_unregister_notifier(&ctnl_notifier);
1586 err_unreg_exp_subsys:
1587         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1588 #endif
1589 err_unreg_subsys:
1590         nfnetlink_subsys_unregister(&ctnl_subsys);
1591 err_out:
1592         return ret;
1593 }
1594
1595 static void __exit ctnetlink_exit(void)
1596 {
1597         printk("ctnetlink: unregistering from nfnetlink.\n");
1598
1599 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1600         nf_conntrack_expect_unregister_notifier(&ctnl_notifier_exp);
1601         nf_conntrack_unregister_notifier(&ctnl_notifier);
1602 #endif
1603
1604         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1605         nfnetlink_subsys_unregister(&ctnl_subsys);
1606         return;
1607 }
1608
1609 module_init(ctnetlink_init);
1610 module_exit(ctnetlink_exit);