net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
   8  *
   9  * Initial connection tracking via netlink development funded and
  10  * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11  *
  12  * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13  *
  14  * This software may be used and distributed according to the terms
  15  * of the GNU General Public License, incorporated herein by reference.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/rculist.h>
  22 #include <linux/rculist_nulls.h>
  23 #include <linux/types.h>
  24 #include <linux/timer.h>
  25 #include <linux/security.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/errno.h>
  28 #include <linux/netlink.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/slab.h>
  32
  33 #include <linux/netfilter.h>
  34 #include <net/netlink.h>
  35 #include <net/sock.h>
  36 #include <net/netfilter/nf_conntrack.h>
  37 #include <net/netfilter/nf_conntrack_core.h>
  38 #include <net/netfilter/nf_conntrack_expect.h>
  39 #include <net/netfilter/nf_conntrack_helper.h>
  40 #include <net/netfilter/nf_conntrack_l3proto.h>
  41 #include <net/netfilter/nf_conntrack_l4proto.h>
  42 #include <net/netfilter/nf_conntrack_tuple.h>
  43 #include <net/netfilter/nf_conntrack_acct.h>
  44 #include <net/netfilter/nf_conntrack_zones.h>
  45 #ifdef CONFIG_NF_NAT_NEEDED
  46 #include <net/netfilter/nf_nat_core.h>
  47 #include <net/netfilter/nf_nat_protocol.h>
  48 #endif
  49
  50 #include <linux/netfilter/nfnetlink.h>
  51 #include <linux/netfilter/nfnetlink_conntrack.h>
  52
  53 MODULE_LICENSE("GPL");
  54
  55 static char __initdata version[] = "0.93";
  56
  57 static inline int
  58 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  59                             const struct nf_conntrack_tuple *tuple,
  60                             struct nf_conntrack_l4proto *l4proto)
  61 {
  62         int ret = 0;
  63         struct nlattr *nest_parms;
  64
  65         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  66         if (!nest_parms)
  67                 goto nla_put_failure;
  68         NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  69
  70         if (likely(l4proto->tuple_to_nlattr))
  71                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  72
  73         nla_nest_end(skb, nest_parms);
  74
  75         return ret;
  76
  77 nla_put_failure:
  78         return -1;
  79 }
  80
  81 static inline int
  82 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  83                          const struct nf_conntrack_tuple *tuple,
  84                          struct nf_conntrack_l3proto *l3proto)
  85 {
  86         int ret = 0;
  87         struct nlattr *nest_parms;
  88
  89         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  90         if (!nest_parms)
  91                 goto nla_put_failure;
  92
  93         if (likely(l3proto->tuple_to_nlattr))
  94                 ret = l3proto->tuple_to_nlattr(skb, tuple);
  95
  96         nla_nest_end(skb, nest_parms);
  97
  98         return ret;
  99
 100 nla_put_failure:
 101         return -1;
 102 }
 103
 104 static int
 105 ctnetlink_dump_tuples(struct sk_buff *skb,
 106                       const struct nf_conntrack_tuple *tuple)
 107 {
 108         int ret;
 109         struct nf_conntrack_l3proto *l3proto;
 110         struct nf_conntrack_l4proto *l4proto;
 111
 112         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 113         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 114
 115         if (unlikely(ret < 0))
 116                 return ret;
 117
 118         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 119         ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 120
 121         return ret;
 122 }
 123
 124 static inline int
 125 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 126 {
 127         NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 128         return 0;
 129
 130 nla_put_failure:
 131         return -1;
 132 }
 133
 134 static inline int
 135 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 136 {
 137         long timeout = (ct->timeout.expires - jiffies) / HZ;
 138
 139         if (timeout < 0)
 140                 timeout = 0;
 141
 142         NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 143         return 0;
 144
 145 nla_put_failure:
 146         return -1;
 147 }
 148
 149 static inline int
 150 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 151 {
 152         struct nf_conntrack_l4proto *l4proto;
 153         struct nlattr *nest_proto;
 154         int ret;
 155
 156         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 157         if (!l4proto->to_nlattr)
 158                 return 0;
 159
 160         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 161         if (!nest_proto)
 162                 goto nla_put_failure;
 163
 164         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 165
 166         nla_nest_end(skb, nest_proto);
 167
 168         return ret;
 169
 170 nla_put_failure:
 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 nlattr *nest_helper;
 178         const struct nf_conn_help *help = nfct_help(ct);
 179         struct nf_conntrack_helper *helper;
 180
 181         if (!help)
 182                 return 0;
 183
 184         helper = rcu_dereference(help->helper);
 185         if (!helper)
 186                 goto out;
 187
 188         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 189         if (!nest_helper)
 190                 goto nla_put_failure;
 191         NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 192
 193         if (helper->to_nlattr)
 194                 helper->to_nlattr(skb, ct);
 195
 196         nla_nest_end(skb, nest_helper);
 197 out:
 198         return 0;
 199
 200 nla_put_failure:
 201         return -1;
 202 }
 203
 204 static int
 205 ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 206                         enum ip_conntrack_dir dir)
 207 {
 208         enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 209         struct nlattr *nest_count;
 210         const struct nf_conn_counter *acct;
 211
 212         acct = nf_conn_acct_find(ct);
 213         if (!acct)
 214                 return 0;
 215
 216         nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 217         if (!nest_count)
 218                 goto nla_put_failure;
 219
 220         NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 221                      cpu_to_be64(acct[dir].packets));
 222         NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 223                      cpu_to_be64(acct[dir].bytes));
 224
 225         nla_nest_end(skb, nest_count);
 226
 227         return 0;
 228
 229 nla_put_failure:
 230         return -1;
 231 }
 232
 233 #ifdef CONFIG_NF_CONNTRACK_MARK
 234 static inline int
 235 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 236 {
 237         NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 238         return 0;
 239
 240 nla_put_failure:
 241         return -1;
 242 }
 243 #else
 244 #define ctnetlink_dump_mark(a, b) (0)
 245 #endif
 246
 247 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 248 static inline int
 249 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 250 {
 251         struct nlattr *nest_secctx;
 252         int len, ret;
 253         char *secctx;
 254
 255         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 256         if (ret)
 257                 return 0;
 258
 259         ret = -1;
 260         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 261         if (!nest_secctx)
 262                 goto nla_put_failure;
 263
 264         NLA_PUT_STRING(skb, CTA_SECCTX_NAME, secctx);
 265         nla_nest_end(skb, nest_secctx);
 266
 267         ret = 0;
 268 nla_put_failure:
 269         security_release_secctx(secctx, len);
 270         return ret;
 271 }
 272 #else
 273 #define ctnetlink_dump_secctx(a, b) (0)
 274 #endif
 275
 276 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 277
 278 static inline int
 279 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 280 {
 281         struct nlattr *nest_parms;
 282
 283         if (!(ct->status & IPS_EXPECTED))
 284                 return 0;
 285
 286         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 287         if (!nest_parms)
 288                 goto nla_put_failure;
 289         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 290                 goto nla_put_failure;
 291         nla_nest_end(skb, nest_parms);
 292
 293         return 0;
 294
 295 nla_put_failure:
 296         return -1;
 297 }
 298
 299 #ifdef CONFIG_NF_NAT_NEEDED
 300 static int
 301 dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 302 {
 303         struct nlattr *nest_parms;
 304
 305         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 306         if (!nest_parms)
 307                 goto nla_put_failure;
 308
 309         NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 310                      htonl(natseq->correction_pos));
 311         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 312                      htonl(natseq->offset_before));
 313         NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 314                      htonl(natseq->offset_after));
 315
 316         nla_nest_end(skb, nest_parms);
 317
 318         return 0;
 319
 320 nla_put_failure:
 321         return -1;
 322 }
 323
 324 static inline int
 325 ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 326 {
 327         struct nf_nat_seq *natseq;
 328         struct nf_conn_nat *nat = nfct_nat(ct);
 329
 330         if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 331                 return 0;
 332
 333         natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 334         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 335                 return -1;
 336
 337         natseq = &nat->seq[IP_CT_DIR_REPLY];
 338         if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 339                 return -1;
 340
 341         return 0;
 342 }
 343 #else
 344 #define ctnetlink_dump_nat_seq_adj(a, b) (0)
 345 #endif
 346
 347 static inline int
 348 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 349 {
 350         NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 351         return 0;
 352
 353 nla_put_failure:
 354         return -1;
 355 }
 356
 357 static inline int
 358 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 359 {
 360         NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 361         return 0;
 362
 363 nla_put_failure:
 364         return -1;
 365 }
 366
 367 static int
 368 ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 369                     int event, struct nf_conn *ct)
 370 {
 371         struct nlmsghdr *nlh;
 372         struct nfgenmsg *nfmsg;
 373         struct nlattr *nest_parms;
 374         unsigned int flags = pid ? NLM_F_MULTI : 0;
 375
 376         event |= NFNL_SUBSYS_CTNETLINK << 8;
 377         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
 378         if (nlh == NULL)
 379                 goto nlmsg_failure;
 380
 381         nfmsg = nlmsg_data(nlh);
 382         nfmsg->nfgen_family = nf_ct_l3num(ct);
 383         nfmsg->version      = NFNETLINK_V0;
 384         nfmsg->res_id       = 0;
 385
 386         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 387         if (!nest_parms)
 388                 goto nla_put_failure;
 389         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 390                 goto nla_put_failure;
 391         nla_nest_end(skb, nest_parms);
 392
 393         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 394         if (!nest_parms)
 395                 goto nla_put_failure;
 396         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 397                 goto nla_put_failure;
 398         nla_nest_end(skb, nest_parms);
 399
 400         if (nf_ct_zone(ct))
 401                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 402
 403         if (ctnetlink_dump_status(skb, ct) < 0 ||
 404             ctnetlink_dump_timeout(skb, ct) < 0 ||
 405             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 406             ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 407             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 408             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 409             ctnetlink_dump_mark(skb, ct) < 0 ||
 410             ctnetlink_dump_secctx(skb, ct) < 0 ||
 411             ctnetlink_dump_id(skb, ct) < 0 ||
 412             ctnetlink_dump_use(skb, ct) < 0 ||
 413             ctnetlink_dump_master(skb, ct) < 0 ||
 414             ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 415                 goto nla_put_failure;
 416
 417         nlmsg_end(skb, nlh);
 418         return skb->len;
 419
 420 nlmsg_failure:
 421 nla_put_failure:
 422         nlmsg_cancel(skb, nlh);
 423         return -1;
 424 }
 425
 426 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 427 static inline size_t
 428 ctnetlink_proto_size(const struct nf_conn *ct)
 429 {
 430         struct nf_conntrack_l3proto *l3proto;
 431         struct nf_conntrack_l4proto *l4proto;
 432         size_t len = 0;
 433
 434         rcu_read_lock();
 435         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 436         len += l3proto->nla_size;
 437
 438         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 439         len += l4proto->nla_size;
 440         rcu_read_unlock();
 441
 442         return len;
 443 }
 444
 445 static inline size_t
 446 ctnetlink_counters_size(const struct nf_conn *ct)
 447 {
 448         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 449                 return 0;
 450         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 451                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 452                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 453                ;
 454 }
 455
 456 static inline int
 457 ctnetlink_secctx_size(const struct nf_conn *ct)
 458 {
 459 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 460         int len, ret;
 461
 462         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 463         if (ret)
 464                 return 0;
 465
 466         return nla_total_size(0) /* CTA_SECCTX */
 467                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 468 #else
 469         return 0;
 470 #endif
 471 }
 472
 473 static inline size_t
 474 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 475 {
 476         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 477                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 478                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 479                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 480                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 481                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 482                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 483                + ctnetlink_counters_size(ct)
 484                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 485                + nla_total_size(0) /* CTA_PROTOINFO */
 486                + nla_total_size(0) /* CTA_HELP */
 487                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 488                + ctnetlink_secctx_size(ct)
 489 #ifdef CONFIG_NF_NAT_NEEDED
 490                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 491                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 492 #endif
 493 #ifdef CONFIG_NF_CONNTRACK_MARK
 494                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 495 #endif
 496                + ctnetlink_proto_size(ct)
 497                ;
 498 }
 499
 500 static int
 501 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 502 {
 503         struct net *net;
 504         struct nlmsghdr *nlh;
 505         struct nfgenmsg *nfmsg;
 506         struct nlattr *nest_parms;
 507         struct nf_conn *ct = item->ct;
 508         struct sk_buff *skb;
 509         unsigned int type;
 510         unsigned int flags = 0, group;
 511         int err;
 512
 513         /* ignore our fake conntrack entry */
 514         if (nf_ct_is_untracked(ct))
 515                 return 0;
 516
 517         if (events & (1 << IPCT_DESTROY)) {
 518                 type = IPCTNL_MSG_CT_DELETE;
 519                 group = NFNLGRP_CONNTRACK_DESTROY;
 520         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 521                 type = IPCTNL_MSG_CT_NEW;
 522                 flags = NLM_F_CREATE|NLM_F_EXCL;
 523                 group = NFNLGRP_CONNTRACK_NEW;
 524         } else  if (events) {
 525                 type = IPCTNL_MSG_CT_NEW;
 526                 group = NFNLGRP_CONNTRACK_UPDATE;
 527         } else
 528                 return 0;
 529
 530         net = nf_ct_net(ct);
 531         if (!item->report && !nfnetlink_has_listeners(net, group))
 532                 return 0;
 533
 534         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 535         if (skb == NULL)
 536                 goto errout;
 537
 538         type |= NFNL_SUBSYS_CTNETLINK << 8;
 539         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 540         if (nlh == NULL)
 541                 goto nlmsg_failure;
 542
 543         nfmsg = nlmsg_data(nlh);
 544         nfmsg->nfgen_family = nf_ct_l3num(ct);
 545         nfmsg->version  = NFNETLINK_V0;
 546         nfmsg->res_id   = 0;
 547
 548         rcu_read_lock();
 549         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 550         if (!nest_parms)
 551                 goto nla_put_failure;
 552         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 553                 goto nla_put_failure;
 554         nla_nest_end(skb, nest_parms);
 555
 556         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 557         if (!nest_parms)
 558                 goto nla_put_failure;
 559         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 560                 goto nla_put_failure;
 561         nla_nest_end(skb, nest_parms);
 562
 563         if (nf_ct_zone(ct))
 564                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 565
 566         if (ctnetlink_dump_id(skb, ct) < 0)
 567                 goto nla_put_failure;
 568
 569         if (ctnetlink_dump_status(skb, ct) < 0)
 570                 goto nla_put_failure;
 571
 572         if (events & (1 << IPCT_DESTROY)) {
 573                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 574                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 575                         goto nla_put_failure;
 576         } else {
 577                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 578                         goto nla_put_failure;
 579
 580                 if (events & (1 << IPCT_PROTOINFO)
 581                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 582                         goto nla_put_failure;
 583
 584                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 585                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 586                         goto nla_put_failure;
 587
 588 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 589                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 590                     && ctnetlink_dump_secctx(skb, ct) < 0)
 591                         goto nla_put_failure;
 592 #endif
 593
 594                 if (events & (1 << IPCT_RELATED) &&
 595                     ctnetlink_dump_master(skb, ct) < 0)
 596                         goto nla_put_failure;
 597
 598                 if (events & (1 << IPCT_NATSEQADJ) &&
 599                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 600                         goto nla_put_failure;
 601         }
 602
 603 #ifdef CONFIG_NF_CONNTRACK_MARK
 604         if ((events & (1 << IPCT_MARK) || ct->mark)
 605             && ctnetlink_dump_mark(skb, ct) < 0)
 606                 goto nla_put_failure;
 607 #endif
 608         rcu_read_unlock();
 609
 610         nlmsg_end(skb, nlh);
 611         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 612                              GFP_ATOMIC);
 613         if (err == -ENOBUFS || err == -EAGAIN)
 614                 return -ENOBUFS;
 615
 616         return 0;
 617
 618 nla_put_failure:
 619         rcu_read_unlock();
 620         nlmsg_cancel(skb, nlh);
 621 nlmsg_failure:
 622         kfree_skb(skb);
 623 errout:
 624         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 625                 return -ENOBUFS;
 626
 627         return 0;
 628 }
 629 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 630
 631 static int ctnetlink_done(struct netlink_callback *cb)
 632 {
 633         if (cb->args[1])
 634                 nf_ct_put((struct nf_conn *)cb->args[1]);
 635         return 0;
 636 }
 637
 638 static int
 639 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 640 {
 641         struct net *net = sock_net(skb->sk);
 642         struct nf_conn *ct, *last;
 643         struct nf_conntrack_tuple_hash *h;
 644         struct hlist_nulls_node *n;
 645         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 646         u_int8_t l3proto = nfmsg->nfgen_family;
 647
 648         spin_lock_bh(&nf_conntrack_lock);
 649         last = (struct nf_conn *)cb->args[1];
 650         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 651 restart:
 652                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 653                                          hnnode) {
 654                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 655                                 continue;
 656                         ct = nf_ct_tuplehash_to_ctrack(h);
 657                         /* Dump entries of a given L3 protocol number.
 658                          * If it is not specified, ie. l3proto == 0,
 659                          * then dump everything. */
 660                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 661                                 continue;
 662                         if (cb->args[1]) {
 663                                 if (ct != last)
 664                                         continue;
 665                                 cb->args[1] = 0;
 666                         }
 667                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 668                                                 cb->nlh->nlmsg_seq,
 669                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 670                                 nf_conntrack_get(&ct->ct_general);
 671                                 cb->args[1] = (unsigned long)ct;
 672                                 goto out;
 673                         }
 674
 675                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 676                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 677                                 struct nf_conn_counter *acct;
 678
 679                                 acct = nf_conn_acct_find(ct);
 680                                 if (acct)
 681                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 682                         }
 683                 }
 684                 if (cb->args[1]) {
 685                         cb->args[1] = 0;
 686                         goto restart;
 687                 }
 688         }
 689 out:
 690         spin_unlock_bh(&nf_conntrack_lock);
 691         if (last)
 692                 nf_ct_put(last);
 693
 694         return skb->len;
 695 }
 696
 697 static inline int
 698 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 699 {
 700         struct nlattr *tb[CTA_IP_MAX+1];
 701         struct nf_conntrack_l3proto *l3proto;
 702         int ret = 0;
 703
 704         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 705
 706         rcu_read_lock();
 707         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 708
 709         if (likely(l3proto->nlattr_to_tuple)) {
 710                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 711                                           l3proto->nla_policy);
 712                 if (ret == 0)
 713                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 714         }
 715
 716         rcu_read_unlock();
 717
 718         return ret;
 719 }
 720
 721 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 722         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 723 };
 724
 725 static inline int
 726 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 727                             struct nf_conntrack_tuple *tuple)
 728 {
 729         struct nlattr *tb[CTA_PROTO_MAX+1];
 730         struct nf_conntrack_l4proto *l4proto;
 731         int ret = 0;
 732
 733         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 734         if (ret < 0)
 735                 return ret;
 736
 737         if (!tb[CTA_PROTO_NUM])
 738                 return -EINVAL;
 739         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 740
 741         rcu_read_lock();
 742         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 743
 744         if (likely(l4proto->nlattr_to_tuple)) {
 745                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 746                                           l4proto->nla_policy);
 747                 if (ret == 0)
 748                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 749         }
 750
 751         rcu_read_unlock();
 752
 753         return ret;
 754 }
 755
 756 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 757         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 758         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 759 };
 760
 761 static int
 762 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 763                       struct nf_conntrack_tuple *tuple,
 764                       enum ctattr_tuple type, u_int8_t l3num)
 765 {
 766         struct nlattr *tb[CTA_TUPLE_MAX+1];
 767         int err;
 768
 769         memset(tuple, 0, sizeof(*tuple));
 770
 771         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 772
 773         if (!tb[CTA_TUPLE_IP])
 774                 return -EINVAL;
 775
 776         tuple->src.l3num = l3num;
 777
 778         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 779         if (err < 0)
 780                 return err;
 781
 782         if (!tb[CTA_TUPLE_PROTO])
 783                 return -EINVAL;
 784
 785         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 786         if (err < 0)
 787                 return err;
 788
 789         /* orig and expect tuples get DIR_ORIGINAL */
 790         if (type == CTA_TUPLE_REPLY)
 791                 tuple->dst.dir = IP_CT_DIR_REPLY;
 792         else
 793                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 794
 795         return 0;
 796 }
 797
 798 static int
 799 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 800 {
 801         if (attr)
 802 #ifdef CONFIG_NF_CONNTRACK_ZONES
 803                 *zone = ntohs(nla_get_be16(attr));
 804 #else
 805                 return -EOPNOTSUPP;
 806 #endif
 807         else
 808                 *zone = 0;
 809
 810         return 0;
 811 }
 812
 813 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 814         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 815 };
 816
 817 static inline int
 818 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 819 {
 820         struct nlattr *tb[CTA_HELP_MAX+1];
 821
 822         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 823
 824         if (!tb[CTA_HELP_NAME])
 825                 return -EINVAL;
 826
 827         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 828
 829         return 0;
 830 }
 831
 832 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 833         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 834         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 835         [CTA_STATUS]            = { .type = NLA_U32 },
 836         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 837         [CTA_HELP]              = { .type = NLA_NESTED },
 838         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 839         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 840         [CTA_MARK]              = { .type = NLA_U32 },
 841         [CTA_ID]                = { .type = NLA_U32 },
 842         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 843         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 844         [CTA_ZONE]              = { .type = NLA_U16 },
 845 };
 846
 847 static int
 848 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 849                         const struct nlmsghdr *nlh,
 850                         const struct nlattr * const cda[])
 851 {
 852         struct net *net = sock_net(ctnl);
 853         struct nf_conntrack_tuple_hash *h;
 854         struct nf_conntrack_tuple tuple;
 855         struct nf_conn *ct;
 856         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 857         u_int8_t u3 = nfmsg->nfgen_family;
 858         u16 zone;
 859         int err;
 860
 861         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 862         if (err < 0)
 863                 return err;
 864
 865         if (cda[CTA_TUPLE_ORIG])
 866                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 867         else if (cda[CTA_TUPLE_REPLY])
 868                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 869         else {
 870                 /* Flush the whole table */
 871                 nf_conntrack_flush_report(net,
 872                                          NETLINK_CB(skb).pid,
 873                                          nlmsg_report(nlh));
 874                 return 0;
 875         }
 876
 877         if (err < 0)
 878                 return err;
 879
 880         h = nf_conntrack_find_get(net, zone, &tuple);
 881         if (!h)
 882                 return -ENOENT;
 883
 884         ct = nf_ct_tuplehash_to_ctrack(h);
 885
 886         if (cda[CTA_ID]) {
 887                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 888                 if (id != (u32)(unsigned long)ct) {
 889                         nf_ct_put(ct);
 890                         return -ENOENT;
 891                 }
 892         }
 893
 894         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 895                                       NETLINK_CB(skb).pid,
 896                                       nlmsg_report(nlh)) < 0) {
 897                 nf_ct_delete_from_lists(ct);
 898                 /* we failed to report the event, try later */
 899                 nf_ct_insert_dying_list(ct);
 900                 nf_ct_put(ct);
 901                 return 0;
 902         }
 903
 904         /* death_by_timeout would report the event again */
 905         set_bit(IPS_DYING_BIT, &ct->status);
 906
 907         nf_ct_kill(ct);
 908         nf_ct_put(ct);
 909
 910         return 0;
 911 }
 912
 913 static int
 914 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 915                         const struct nlmsghdr *nlh,
 916                         const struct nlattr * const cda[])
 917 {
 918         struct net *net = sock_net(ctnl);
 919         struct nf_conntrack_tuple_hash *h;
 920         struct nf_conntrack_tuple tuple;
 921         struct nf_conn *ct;
 922         struct sk_buff *skb2 = NULL;
 923         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 924         u_int8_t u3 = nfmsg->nfgen_family;
 925         u16 zone;
 926         int err;
 927
 928         if (nlh->nlmsg_flags & NLM_F_DUMP)
 929                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 930                                           ctnetlink_done);
 931
 932         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 933         if (err < 0)
 934                 return err;
 935
 936         if (cda[CTA_TUPLE_ORIG])
 937                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 938         else if (cda[CTA_TUPLE_REPLY])
 939                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 940         else
 941                 return -EINVAL;
 942
 943         if (err < 0)
 944                 return err;
 945
 946         h = nf_conntrack_find_get(net, zone, &tuple);
 947         if (!h)
 948                 return -ENOENT;
 949
 950         ct = nf_ct_tuplehash_to_ctrack(h);
 951
 952         err = -ENOMEM;
 953         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 954         if (skb2 == NULL) {
 955                 nf_ct_put(ct);
 956                 return -ENOMEM;
 957         }
 958
 959         rcu_read_lock();
 960         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 961                                   IPCTNL_MSG_CT_NEW, ct);
 962         rcu_read_unlock();
 963         nf_ct_put(ct);
 964         if (err <= 0)
 965                 goto free;
 966
 967         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 968         if (err < 0)
 969                 goto out;
 970
 971         return 0;
 972
 973 free:
 974         kfree_skb(skb2);
 975 out:
 976         /* this avoids a loop in nfnetlink. */
 977         return err == -EAGAIN ? -ENOBUFS : err;
 978 }
 979
 980 #ifdef CONFIG_NF_NAT_NEEDED
 981 static int
 982 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 983                           enum nf_nat_manip_type manip,
 984                           const struct nlattr *attr)
 985 {
 986         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 987
 988         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 989         if (!parse_nat_setup) {
 990 #ifdef CONFIG_MODULES
 991                 rcu_read_unlock();
 992                 spin_unlock_bh(&nf_conntrack_lock);
 993                 nfnl_unlock();
 994                 if (request_module("nf-nat-ipv4") < 0) {
 995                         nfnl_lock();
 996                         spin_lock_bh(&nf_conntrack_lock);
 997                         rcu_read_lock();
 998                         return -EOPNOTSUPP;
 999                 }
1000                 nfnl_lock();
1001                 spin_lock_bh(&nf_conntrack_lock);
1002                 rcu_read_lock();
1003                 if (nfnetlink_parse_nat_setup_hook)
1004                         return -EAGAIN;
1005 #endif
1006                 return -EOPNOTSUPP;
1007         }
1008
1009         return parse_nat_setup(ct, manip, attr);
1010 }
1011 #endif
1012
1013 static int
1014 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1015 {
1016         unsigned long d;
1017         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1018         d = ct->status ^ status;
1019
1020         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1021                 /* unchangeable */
1022                 return -EBUSY;
1023
1024         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1025                 /* SEEN_REPLY bit can only be set */
1026                 return -EBUSY;
1027
1028         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1029                 /* ASSURED bit can only be set */
1030                 return -EBUSY;
1031
1032         /* Be careful here, modifying NAT bits can screw up things,
1033          * so don't let users modify them directly if they don't pass
1034          * nf_nat_range. */
1035         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1036         return 0;
1037 }
1038
1039 static int
1040 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1041 {
1042 #ifdef CONFIG_NF_NAT_NEEDED
1043         int ret;
1044
1045         if (cda[CTA_NAT_DST]) {
1046                 ret = ctnetlink_parse_nat_setup(ct,
1047                                                 IP_NAT_MANIP_DST,
1048                                                 cda[CTA_NAT_DST]);
1049                 if (ret < 0)
1050                         return ret;
1051         }
1052         if (cda[CTA_NAT_SRC]) {
1053                 ret = ctnetlink_parse_nat_setup(ct,
1054                                                 IP_NAT_MANIP_SRC,
1055                                                 cda[CTA_NAT_SRC]);
1056                 if (ret < 0)
1057                         return ret;
1058         }
1059         return 0;
1060 #else
1061         return -EOPNOTSUPP;
1062 #endif
1063 }
1064
1065 static inline int
1066 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1067 {
1068         struct nf_conntrack_helper *helper;
1069         struct nf_conn_help *help = nfct_help(ct);
1070         char *helpname = NULL;
1071         int err;
1072
1073         /* don't change helper of sibling connections */
1074         if (ct->master)
1075                 return -EBUSY;
1076
1077         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1078         if (err < 0)
1079                 return err;
1080
1081         if (!strcmp(helpname, "")) {
1082                 if (help && help->helper) {
1083                         /* we had a helper before ... */
1084                         nf_ct_remove_expectations(ct);
1085                         rcu_assign_pointer(help->helper, NULL);
1086                 }
1087
1088                 return 0;
1089         }
1090
1091         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1092                                             nf_ct_protonum(ct));
1093         if (helper == NULL) {
1094 #ifdef CONFIG_MODULES
1095                 spin_unlock_bh(&nf_conntrack_lock);
1096
1097                 if (request_module("nfct-helper-%s", helpname) < 0) {
1098                         spin_lock_bh(&nf_conntrack_lock);
1099                         return -EOPNOTSUPP;
1100                 }
1101
1102                 spin_lock_bh(&nf_conntrack_lock);
1103                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1104                                                     nf_ct_protonum(ct));
1105                 if (helper)
1106                         return -EAGAIN;
1107 #endif
1108                 return -EOPNOTSUPP;
1109         }
1110
1111         if (help) {
1112                 if (help->helper == helper)
1113                         return 0;
1114                 if (help->helper)
1115                         return -EBUSY;
1116                 /* need to zero data of old helper */
1117                 memset(&help->help, 0, sizeof(help->help));
1118         } else {
1119                 /* we cannot set a helper for an existing conntrack */
1120                 return -EOPNOTSUPP;
1121         }
1122
1123         rcu_assign_pointer(help->helper, helper);
1124
1125         return 0;
1126 }
1127
1128 static inline int
1129 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1130 {
1131         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1132
1133         if (!del_timer(&ct->timeout))
1134                 return -ETIME;
1135
1136         ct->timeout.expires = jiffies + timeout * HZ;
1137         add_timer(&ct->timeout);
1138
1139         return 0;
1140 }
1141
1142 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1143         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1144         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1145         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1146 };
1147
1148 static inline int
1149 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1150 {
1151         const struct nlattr *attr = cda[CTA_PROTOINFO];
1152         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1153         struct nf_conntrack_l4proto *l4proto;
1154         int err = 0;
1155
1156         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1157
1158         rcu_read_lock();
1159         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1160         if (l4proto->from_nlattr)
1161                 err = l4proto->from_nlattr(tb, ct);
1162         rcu_read_unlock();
1163
1164         return err;
1165 }
1166
1167 #ifdef CONFIG_NF_NAT_NEEDED
1168 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1169         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1170         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1171         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1172 };
1173
1174 static inline int
1175 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1176 {
1177         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1178
1179         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1180
1181         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1182                 return -EINVAL;
1183
1184         natseq->correction_pos =
1185                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1186
1187         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1188                 return -EINVAL;
1189
1190         natseq->offset_before =
1191                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1192
1193         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1194                 return -EINVAL;
1195
1196         natseq->offset_after =
1197                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1198
1199         return 0;
1200 }
1201
1202 static int
1203 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1204                              const struct nlattr * const cda[])
1205 {
1206         int ret = 0;
1207         struct nf_conn_nat *nat = nfct_nat(ct);
1208
1209         if (!nat)
1210                 return 0;
1211
1212         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1213                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1214                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1215                 if (ret < 0)
1216                         return ret;
1217
1218                 ct->status |= IPS_SEQ_ADJUST;
1219         }
1220
1221         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1222                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1223                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1224                 if (ret < 0)
1225                         return ret;
1226
1227                 ct->status |= IPS_SEQ_ADJUST;
1228         }
1229
1230         return 0;
1231 }
1232 #endif
1233
1234 static int
1235 ctnetlink_change_conntrack(struct nf_conn *ct,
1236                            const struct nlattr * const cda[])
1237 {
1238         int err;
1239
1240         /* only allow NAT changes and master assignation for new conntracks */
1241         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1242                 return -EOPNOTSUPP;
1243
1244         if (cda[CTA_HELP]) {
1245                 err = ctnetlink_change_helper(ct, cda);
1246                 if (err < 0)
1247                         return err;
1248         }
1249
1250         if (cda[CTA_TIMEOUT]) {
1251                 err = ctnetlink_change_timeout(ct, cda);
1252                 if (err < 0)
1253                         return err;
1254         }
1255
1256         if (cda[CTA_STATUS]) {
1257                 err = ctnetlink_change_status(ct, cda);
1258                 if (err < 0)
1259                         return err;
1260         }
1261
1262         if (cda[CTA_PROTOINFO]) {
1263                 err = ctnetlink_change_protoinfo(ct, cda);
1264                 if (err < 0)
1265                         return err;
1266         }
1267
1268 #if defined(CONFIG_NF_CONNTRACK_MARK)
1269         if (cda[CTA_MARK])
1270                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1271 #endif
1272
1273 #ifdef CONFIG_NF_NAT_NEEDED
1274         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1275                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1276                 if (err < 0)
1277                         return err;
1278         }
1279 #endif
1280
1281         return 0;
1282 }
1283
1284 static struct nf_conn *
1285 ctnetlink_create_conntrack(struct net *net, u16 zone,
1286                            const struct nlattr * const cda[],
1287                            struct nf_conntrack_tuple *otuple,
1288                            struct nf_conntrack_tuple *rtuple,
1289                            u8 u3)
1290 {
1291         struct nf_conn *ct;
1292         int err = -EINVAL;
1293         struct nf_conntrack_helper *helper;
1294
1295         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1296         if (IS_ERR(ct))
1297                 return ERR_PTR(-ENOMEM);
1298
1299         if (!cda[CTA_TIMEOUT])
1300                 goto err1;
1301         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1302
1303         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1304
1305         rcu_read_lock();
1306         if (cda[CTA_HELP]) {
1307                 char *helpname = NULL;
1308
1309                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1310                 if (err < 0)
1311                         goto err2;
1312
1313                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1314                                                     nf_ct_protonum(ct));
1315                 if (helper == NULL) {
1316                         rcu_read_unlock();
1317 #ifdef CONFIG_MODULES
1318                         if (request_module("nfct-helper-%s", helpname) < 0) {
1319                                 err = -EOPNOTSUPP;
1320                                 goto err1;
1321                         }
1322
1323                         rcu_read_lock();
1324                         helper = __nf_conntrack_helper_find(helpname,
1325                                                             nf_ct_l3num(ct),
1326                                                             nf_ct_protonum(ct));
1327                         if (helper) {
1328                                 err = -EAGAIN;
1329                                 goto err2;
1330                         }
1331                         rcu_read_unlock();
1332 #endif
1333                         err = -EOPNOTSUPP;
1334                         goto err1;
1335                 } else {
1336                         struct nf_conn_help *help;
1337
1338                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1339                         if (help == NULL) {
1340                                 err = -ENOMEM;
1341                                 goto err2;
1342                         }
1343
1344                         /* not in hash table yet so not strictly necessary */
1345                         rcu_assign_pointer(help->helper, helper);
1346                 }
1347         } else {
1348                 /* try an implicit helper assignation */
1349                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1350                 if (err < 0)
1351                         goto err2;
1352         }
1353
1354         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1355                 err = ctnetlink_change_nat(ct, cda);
1356                 if (err < 0)
1357                         goto err2;
1358         }
1359
1360         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1361         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1362         /* we must add conntrack extensions before confirmation. */
1363         ct->status |= IPS_CONFIRMED;
1364
1365         if (cda[CTA_STATUS]) {
1366                 err = ctnetlink_change_status(ct, cda);
1367                 if (err < 0)
1368                         goto err2;
1369         }
1370
1371 #ifdef CONFIG_NF_NAT_NEEDED
1372         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1373                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1374                 if (err < 0)
1375                         goto err2;
1376         }
1377 #endif
1378
1379         if (cda[CTA_PROTOINFO]) {
1380                 err = ctnetlink_change_protoinfo(ct, cda);
1381                 if (err < 0)
1382                         goto err2;
1383         }
1384
1385 #if defined(CONFIG_NF_CONNTRACK_MARK)
1386         if (cda[CTA_MARK])
1387                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1388 #endif
1389
1390         /* setup master conntrack: this is a confirmed expectation */
1391         if (cda[CTA_TUPLE_MASTER]) {
1392                 struct nf_conntrack_tuple master;
1393                 struct nf_conntrack_tuple_hash *master_h;
1394                 struct nf_conn *master_ct;
1395
1396                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1397                 if (err < 0)
1398                         goto err2;
1399
1400                 master_h = nf_conntrack_find_get(net, zone, &master);
1401                 if (master_h == NULL) {
1402                         err = -ENOENT;
1403                         goto err2;
1404                 }
1405                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1406                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1407                 ct->master = master_ct;
1408         }
1409
1410         add_timer(&ct->timeout);
1411         nf_conntrack_hash_insert(ct);
1412         rcu_read_unlock();
1413
1414         return ct;
1415
1416 err2:
1417         rcu_read_unlock();
1418 err1:
1419         nf_conntrack_free(ct);
1420         return ERR_PTR(err);
1421 }
1422
1423 static int
1424 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1425                         const struct nlmsghdr *nlh,
1426                         const struct nlattr * const cda[])
1427 {
1428         struct net *net = sock_net(ctnl);
1429         struct nf_conntrack_tuple otuple, rtuple;
1430         struct nf_conntrack_tuple_hash *h = NULL;
1431         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1432         u_int8_t u3 = nfmsg->nfgen_family;
1433         u16 zone;
1434         int err;
1435
1436         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1437         if (err < 0)
1438                 return err;
1439
1440         if (cda[CTA_TUPLE_ORIG]) {
1441                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1442                 if (err < 0)
1443                         return err;
1444         }
1445
1446         if (cda[CTA_TUPLE_REPLY]) {
1447                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1448                 if (err < 0)
1449                         return err;
1450         }
1451
1452         spin_lock_bh(&nf_conntrack_lock);
1453         if (cda[CTA_TUPLE_ORIG])
1454                 h = __nf_conntrack_find(net, zone, &otuple);
1455         else if (cda[CTA_TUPLE_REPLY])
1456                 h = __nf_conntrack_find(net, zone, &rtuple);
1457
1458         if (h == NULL) {
1459                 err = -ENOENT;
1460                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1461                         struct nf_conn *ct;
1462                         enum ip_conntrack_events events;
1463
1464                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1465                                                         &rtuple, u3);
1466                         if (IS_ERR(ct)) {
1467                                 err = PTR_ERR(ct);
1468                                 goto out_unlock;
1469                         }
1470                         err = 0;
1471                         nf_conntrack_get(&ct->ct_general);
1472                         spin_unlock_bh(&nf_conntrack_lock);
1473                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1474                                 events = IPCT_RELATED;
1475                         else
1476                                 events = IPCT_NEW;
1477
1478                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1479                                                       (1 << IPCT_ASSURED) |
1480                                                       (1 << IPCT_HELPER) |
1481                                                       (1 << IPCT_PROTOINFO) |
1482                                                       (1 << IPCT_NATSEQADJ) |
1483                                                       (1 << IPCT_MARK) | events,
1484                                                       ct, NETLINK_CB(skb).pid,
1485                                                       nlmsg_report(nlh));
1486                         nf_ct_put(ct);
1487                 } else
1488                         spin_unlock_bh(&nf_conntrack_lock);
1489
1490                 return err;
1491         }
1492         /* implicit 'else' */
1493
1494         /* We manipulate the conntrack inside the global conntrack table lock,
1495          * so there's no need to increase the refcount */
1496         err = -EEXIST;
1497         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1498                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1499
1500                 err = ctnetlink_change_conntrack(ct, cda);
1501                 if (err == 0) {
1502                         nf_conntrack_get(&ct->ct_general);
1503                         spin_unlock_bh(&nf_conntrack_lock);
1504                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1505                                                       (1 << IPCT_ASSURED) |
1506                                                       (1 << IPCT_HELPER) |
1507                                                       (1 << IPCT_PROTOINFO) |
1508                                                       (1 << IPCT_NATSEQADJ) |
1509                                                       (1 << IPCT_MARK),
1510                                                       ct, NETLINK_CB(skb).pid,
1511                                                       nlmsg_report(nlh));
1512                         nf_ct_put(ct);
1513                 } else
1514                         spin_unlock_bh(&nf_conntrack_lock);
1515
1516                 return err;
1517         }
1518
1519 out_unlock:
1520         spin_unlock_bh(&nf_conntrack_lock);
1521         return err;
1522 }
1523
1524 /***********************************************************************
1525  * EXPECT
1526  ***********************************************************************/
1527
1528 static inline int
1529 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1530                          const struct nf_conntrack_tuple *tuple,
1531                          enum ctattr_expect type)
1532 {
1533         struct nlattr *nest_parms;
1534
1535         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1536         if (!nest_parms)
1537                 goto nla_put_failure;
1538         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1539                 goto nla_put_failure;
1540         nla_nest_end(skb, nest_parms);
1541
1542         return 0;
1543
1544 nla_put_failure:
1545         return -1;
1546 }
1547
1548 static inline int
1549 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1550                         const struct nf_conntrack_tuple *tuple,
1551                         const struct nf_conntrack_tuple_mask *mask)
1552 {
1553         int ret;
1554         struct nf_conntrack_l3proto *l3proto;
1555         struct nf_conntrack_l4proto *l4proto;
1556         struct nf_conntrack_tuple m;
1557         struct nlattr *nest_parms;
1558
1559         memset(&m, 0xFF, sizeof(m));
1560         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1561         m.src.u.all = mask->src.u.all;
1562         m.dst.protonum = tuple->dst.protonum;
1563
1564         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1565         if (!nest_parms)
1566                 goto nla_put_failure;
1567
1568         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1569         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1570
1571         if (unlikely(ret < 0))
1572                 goto nla_put_failure;
1573
1574         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1575         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1576         if (unlikely(ret < 0))
1577                 goto nla_put_failure;
1578
1579         nla_nest_end(skb, nest_parms);
1580
1581         return 0;
1582
1583 nla_put_failure:
1584         return -1;
1585 }
1586
1587 static int
1588 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1589                           const struct nf_conntrack_expect *exp)
1590 {
1591         struct nf_conn *master = exp->master;
1592         long timeout = (exp->timeout.expires - jiffies) / HZ;
1593         struct nf_conn_help *help;
1594
1595         if (timeout < 0)
1596                 timeout = 0;
1597
1598         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1599                 goto nla_put_failure;
1600         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1601                 goto nla_put_failure;
1602         if (ctnetlink_exp_dump_tuple(skb,
1603                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1604                                  CTA_EXPECT_MASTER) < 0)
1605                 goto nla_put_failure;
1606
1607         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1608         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1609         NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1610         help = nfct_help(master);
1611         if (help) {
1612                 struct nf_conntrack_helper *helper;
1613
1614                 helper = rcu_dereference(help->helper);
1615                 if (helper)
1616                         NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1617         }
1618
1619         return 0;
1620
1621 nla_put_failure:
1622         return -1;
1623 }
1624
1625 static int
1626 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1627                         int event, const struct nf_conntrack_expect *exp)
1628 {
1629         struct nlmsghdr *nlh;
1630         struct nfgenmsg *nfmsg;
1631         unsigned int flags = pid ? NLM_F_MULTI : 0;
1632
1633         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1634         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1635         if (nlh == NULL)
1636                 goto nlmsg_failure;
1637
1638         nfmsg = nlmsg_data(nlh);
1639         nfmsg->nfgen_family = exp->tuple.src.l3num;
1640         nfmsg->version      = NFNETLINK_V0;
1641         nfmsg->res_id       = 0;
1642
1643         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1644                 goto nla_put_failure;
1645
1646         nlmsg_end(skb, nlh);
1647         return skb->len;
1648
1649 nlmsg_failure:
1650 nla_put_failure:
1651         nlmsg_cancel(skb, nlh);
1652         return -1;
1653 }
1654
1655 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1656 static int
1657 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1658 {
1659         struct nf_conntrack_expect *exp = item->exp;
1660         struct net *net = nf_ct_exp_net(exp);
1661         struct nlmsghdr *nlh;
1662         struct nfgenmsg *nfmsg;
1663         struct sk_buff *skb;
1664         unsigned int type, group;
1665         int flags = 0;
1666
1667         if (events & (1 << IPEXP_DESTROY)) {
1668                 type = IPCTNL_MSG_EXP_DELETE;
1669                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1670         } else if (events & (1 << IPEXP_NEW)) {
1671                 type = IPCTNL_MSG_EXP_NEW;
1672                 flags = NLM_F_CREATE|NLM_F_EXCL;
1673                 group = NFNLGRP_CONNTRACK_EXP_NEW;
1674         } else
1675                 return 0;
1676
1677         if (!item->report && !nfnetlink_has_listeners(net, group))
1678                 return 0;
1679
1680         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1681         if (skb == NULL)
1682                 goto errout;
1683
1684         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1685         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1686         if (nlh == NULL)
1687                 goto nlmsg_failure;
1688
1689         nfmsg = nlmsg_data(nlh);
1690         nfmsg->nfgen_family = exp->tuple.src.l3num;
1691         nfmsg->version      = NFNETLINK_V0;
1692         nfmsg->res_id       = 0;
1693
1694         rcu_read_lock();
1695         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1696                 goto nla_put_failure;
1697         rcu_read_unlock();
1698
1699         nlmsg_end(skb, nlh);
1700         nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1701         return 0;
1702
1703 nla_put_failure:
1704         rcu_read_unlock();
1705         nlmsg_cancel(skb, nlh);
1706 nlmsg_failure:
1707         kfree_skb(skb);
1708 errout:
1709         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1710         return 0;
1711 }
1712 #endif
1713 static int ctnetlink_exp_done(struct netlink_callback *cb)
1714 {
1715         if (cb->args[1])
1716                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1717         return 0;
1718 }
1719
1720 static int
1721 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1722 {
1723         struct net *net = sock_net(skb->sk);
1724         struct nf_conntrack_expect *exp, *last;
1725         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1726         struct hlist_node *n;
1727         u_int8_t l3proto = nfmsg->nfgen_family;
1728
1729         rcu_read_lock();
1730         last = (struct nf_conntrack_expect *)cb->args[1];
1731         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1732 restart:
1733                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1734                                      hnode) {
1735                         if (l3proto && exp->tuple.src.l3num != l3proto)
1736                                 continue;
1737                         if (cb->args[1]) {
1738                                 if (exp != last)
1739                                         continue;
1740                                 cb->args[1] = 0;
1741                         }
1742                         if (ctnetlink_exp_fill_info(skb,
1743                                                     NETLINK_CB(cb->skb).pid,
1744                                                     cb->nlh->nlmsg_seq,
1745                                                     IPCTNL_MSG_EXP_NEW,
1746                                                     exp) < 0) {
1747                                 if (!atomic_inc_not_zero(&exp->use))
1748                                         continue;
1749                                 cb->args[1] = (unsigned long)exp;
1750                                 goto out;
1751                         }
1752                 }
1753                 if (cb->args[1]) {
1754                         cb->args[1] = 0;
1755                         goto restart;
1756                 }
1757         }
1758 out:
1759         rcu_read_unlock();
1760         if (last)
1761                 nf_ct_expect_put(last);
1762
1763         return skb->len;
1764 }
1765
1766 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1767         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1768         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1769         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1770         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1771         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1772         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1773         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1774         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1775 };
1776
1777 static int
1778 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1779                      const struct nlmsghdr *nlh,
1780                      const struct nlattr * const cda[])
1781 {
1782         struct net *net = sock_net(ctnl);
1783         struct nf_conntrack_tuple tuple;
1784         struct nf_conntrack_expect *exp;
1785         struct sk_buff *skb2;
1786         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1787         u_int8_t u3 = nfmsg->nfgen_family;
1788         u16 zone;
1789         int err;
1790
1791         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1792                 return netlink_dump_start(ctnl, skb, nlh,
1793                                           ctnetlink_exp_dump_table,
1794                                           ctnetlink_exp_done);
1795         }
1796
1797         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1798         if (err < 0)
1799                 return err;
1800
1801         if (cda[CTA_EXPECT_MASTER])
1802                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1803         else
1804                 return -EINVAL;
1805
1806         if (err < 0)
1807                 return err;
1808
1809         exp = nf_ct_expect_find_get(net, zone, &tuple);
1810         if (!exp)
1811                 return -ENOENT;
1812
1813         if (cda[CTA_EXPECT_ID]) {
1814                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1815                 if (ntohl(id) != (u32)(unsigned long)exp) {
1816                         nf_ct_expect_put(exp);
1817                         return -ENOENT;
1818                 }
1819         }
1820
1821         err = -ENOMEM;
1822         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1823         if (skb2 == NULL)
1824                 goto out;
1825
1826         rcu_read_lock();
1827         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1828                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1829         rcu_read_unlock();
1830         if (err <= 0)
1831                 goto free;
1832
1833         nf_ct_expect_put(exp);
1834
1835         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1836
1837 free:
1838         kfree_skb(skb2);
1839 out:
1840         nf_ct_expect_put(exp);
1841         return err;
1842 }
1843
1844 static int
1845 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1846                      const struct nlmsghdr *nlh,
1847                      const struct nlattr * const cda[])
1848 {
1849         struct net *net = sock_net(ctnl);
1850         struct nf_conntrack_expect *exp;
1851         struct nf_conntrack_tuple tuple;
1852         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1853         struct hlist_node *n, *next;
1854         u_int8_t u3 = nfmsg->nfgen_family;
1855         unsigned int i;
1856         u16 zone;
1857         int err;
1858
1859         if (cda[CTA_EXPECT_TUPLE]) {
1860                 /* delete a single expect by tuple */
1861                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1862                 if (err < 0)
1863                         return err;
1864
1865                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1866                 if (err < 0)
1867                         return err;
1868
1869                 /* bump usage count to 2 */
1870                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1871                 if (!exp)
1872                         return -ENOENT;
1873
1874                 if (cda[CTA_EXPECT_ID]) {
1875                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1876                         if (ntohl(id) != (u32)(unsigned long)exp) {
1877                                 nf_ct_expect_put(exp);
1878                                 return -ENOENT;
1879                         }
1880                 }
1881
1882                 /* after list removal, usage count == 1 */
1883                 spin_lock_bh(&nf_conntrack_lock);
1884                 if (del_timer(&exp->timeout)) {
1885                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1886                                                    nlmsg_report(nlh));
1887                         nf_ct_expect_put(exp);
1888                 }
1889                 spin_unlock_bh(&nf_conntrack_lock);
1890                 /* have to put what we 'get' above.
1891                  * after this line usage count == 0 */
1892                 nf_ct_expect_put(exp);
1893         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1894                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1895                 struct nf_conn_help *m_help;
1896
1897                 /* delete all expectations for this helper */
1898                 spin_lock_bh(&nf_conntrack_lock);
1899                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1900                         hlist_for_each_entry_safe(exp, n, next,
1901                                                   &net->ct.expect_hash[i],
1902                                                   hnode) {
1903                                 m_help = nfct_help(exp->master);
1904                                 if (!strcmp(m_help->helper->name, name) &&
1905                                     del_timer(&exp->timeout)) {
1906                                         nf_ct_unlink_expect_report(exp,
1907                                                         NETLINK_CB(skb).pid,
1908                                                         nlmsg_report(nlh));
1909                                         nf_ct_expect_put(exp);
1910                                 }
1911                         }
1912                 }
1913                 spin_unlock_bh(&nf_conntrack_lock);
1914         } else {
1915                 /* This basically means we have to flush everything*/
1916                 spin_lock_bh(&nf_conntrack_lock);
1917                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1918                         hlist_for_each_entry_safe(exp, n, next,
1919                                                   &net->ct.expect_hash[i],
1920                                                   hnode) {
1921                                 if (del_timer(&exp->timeout)) {
1922                                         nf_ct_unlink_expect_report(exp,
1923                                                         NETLINK_CB(skb).pid,
1924                                                         nlmsg_report(nlh));
1925                                         nf_ct_expect_put(exp);
1926                                 }
1927                         }
1928                 }
1929                 spin_unlock_bh(&nf_conntrack_lock);
1930         }
1931
1932         return 0;
1933 }
1934 static int
1935 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1936                         const struct nlattr * const cda[])
1937 {
1938         return -EOPNOTSUPP;
1939 }
1940
1941 static int
1942 ctnetlink_create_expect(struct net *net, u16 zone,
1943                         const struct nlattr * const cda[],
1944                         u_int8_t u3,
1945                         u32 pid, int report)
1946 {
1947         struct nf_conntrack_tuple tuple, mask, master_tuple;
1948         struct nf_conntrack_tuple_hash *h = NULL;
1949         struct nf_conntrack_expect *exp;
1950         struct nf_conn *ct;
1951         struct nf_conn_help *help;
1952         int err = 0;
1953
1954         /* caller guarantees that those three CTA_EXPECT_* exist */
1955         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1956         if (err < 0)
1957                 return err;
1958         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1959         if (err < 0)
1960                 return err;
1961         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1962         if (err < 0)
1963                 return err;
1964
1965         /* Look for master conntrack of this expectation */
1966         h = nf_conntrack_find_get(net, zone, &master_tuple);
1967         if (!h)
1968                 return -ENOENT;
1969         ct = nf_ct_tuplehash_to_ctrack(h);
1970         exp = nf_ct_expect_alloc(ct);
1971         if (!exp) {
1972                 err = -ENOMEM;
1973                 goto out;
1974         }
1975         help = nfct_help(ct);
1976         if (!help) {
1977                 if (!cda[CTA_EXPECT_TIMEOUT]) {
1978                         err = -EINVAL;
1979                         goto out;
1980                 }
1981                 exp->timeout.expires =
1982                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1983
1984                 exp->flags = NF_CT_EXPECT_USERSPACE;
1985                 if (cda[CTA_EXPECT_FLAGS]) {
1986                         exp->flags |=
1987                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1988                 }
1989         } else {
1990                 if (cda[CTA_EXPECT_FLAGS]) {
1991                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1992                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1993                 } else
1994                         exp->flags = 0;
1995         }
1996
1997         exp->class = 0;
1998         exp->expectfn = NULL;
1999         exp->master = ct;
2000         exp->helper = NULL;
2001         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2002         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2003         exp->mask.src.u.all = mask.src.u.all;
2004
2005         err = nf_ct_expect_related_report(exp, pid, report);
2006         nf_ct_expect_put(exp);
2007
2008 out:
2009         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2010         return err;
2011 }
2012
2013 static int
2014 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2015                      const struct nlmsghdr *nlh,
2016                      const struct nlattr * const cda[])
2017 {
2018         struct net *net = sock_net(ctnl);
2019         struct nf_conntrack_tuple tuple;
2020         struct nf_conntrack_expect *exp;
2021         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2022         u_int8_t u3 = nfmsg->nfgen_family;
2023         u16 zone;
2024         int err;
2025
2026         if (!cda[CTA_EXPECT_TUPLE]
2027             || !cda[CTA_EXPECT_MASK]
2028             || !cda[CTA_EXPECT_MASTER])
2029                 return -EINVAL;
2030
2031         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2032         if (err < 0)
2033                 return err;
2034
2035         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2036         if (err < 0)
2037                 return err;
2038
2039         spin_lock_bh(&nf_conntrack_lock);
2040         exp = __nf_ct_expect_find(net, zone, &tuple);
2041
2042         if (!exp) {
2043                 spin_unlock_bh(&nf_conntrack_lock);
2044                 err = -ENOENT;
2045                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2046                         err = ctnetlink_create_expect(net, zone, cda,
2047                                                       u3,
2048                                                       NETLINK_CB(skb).pid,
2049                                                       nlmsg_report(nlh));
2050                 }
2051                 return err;
2052         }
2053
2054         err = -EEXIST;
2055         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2056                 err = ctnetlink_change_expect(exp, cda);
2057         spin_unlock_bh(&nf_conntrack_lock);
2058
2059         return err;
2060 }
2061
2062 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2063 static struct nf_ct_event_notifier ctnl_notifier = {
2064         .fcn = ctnetlink_conntrack_event,
2065 };
2066
2067 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2068         .fcn = ctnetlink_expect_event,
2069 };
2070 #endif
2071
2072 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2073         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2074                                             .attr_count = CTA_MAX,
2075                                             .policy = ct_nla_policy },
2076         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2077                                             .attr_count = CTA_MAX,
2078                                             .policy = ct_nla_policy },
2079         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2080                                             .attr_count = CTA_MAX,
2081                                             .policy = ct_nla_policy },
2082         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2083                                             .attr_count = CTA_MAX,
2084                                             .policy = ct_nla_policy },
2085 };
2086
2087 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2088         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2089                                             .attr_count = CTA_EXPECT_MAX,
2090                                             .policy = exp_nla_policy },
2091         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2092                                             .attr_count = CTA_EXPECT_MAX,
2093                                             .policy = exp_nla_policy },
2094         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2095                                             .attr_count = CTA_EXPECT_MAX,
2096                                             .policy = exp_nla_policy },
2097 };
2098
2099 static const struct nfnetlink_subsystem ctnl_subsys = {
2100         .name                           = "conntrack",
2101         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2102         .cb_count                       = IPCTNL_MSG_MAX,
2103         .cb                             = ctnl_cb,
2104 };
2105
2106 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2107         .name                           = "conntrack_expect",
2108         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2109         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2110         .cb                             = ctnl_exp_cb,
2111 };
2112
2113 MODULE_ALIAS("ip_conntrack_netlink");
2114 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2115 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2116
2117 static int __init ctnetlink_init(void)
2118 {
2119         int ret;
2120
2121         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2122         ret = nfnetlink_subsys_register(&ctnl_subsys);
2123         if (ret < 0) {
2124                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2125                 goto err_out;
2126         }
2127
2128         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2129         if (ret < 0) {
2130                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2131                 goto err_unreg_subsys;
2132         }
2133
2134 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2135         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2136         if (ret < 0) {
2137                 pr_err("ctnetlink_init: cannot register notifier.\n");
2138                 goto err_unreg_exp_subsys;
2139         }
2140
2141         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2142         if (ret < 0) {
2143                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2144                 goto err_unreg_notifier;
2145         }
2146 #endif
2147
2148         return 0;
2149
2150 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2151 err_unreg_notifier:
2152         nf_conntrack_unregister_notifier(&ctnl_notifier);
2153 err_unreg_exp_subsys:
2154         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2155 #endif
2156 err_unreg_subsys:
2157         nfnetlink_subsys_unregister(&ctnl_subsys);
2158 err_out:
2159         return ret;
2160 }
2161
2162 static void __exit ctnetlink_exit(void)
2163 {
2164         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2165
2166         nf_ct_remove_userspace_expectations();
2167 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2168         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2169         nf_conntrack_unregister_notifier(&ctnl_notifier);
2170 #endif
2171
2172         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2173         nfnetlink_subsys_unregister(&ctnl_subsys);
2174 }
2175
2176 module_init(ctnetlink_init);
2177 module_exit(ctnetlink_exit);