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                                 cb->args[1] = (unsigned long)ct;
 671                                 goto out;
 672                         }
 673
 674                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 675                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 676                                 struct nf_conn_counter *acct;
 677
 678                                 acct = nf_conn_acct_find(ct);
 679                                 if (acct)
 680                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 681                         }
 682                 }
 683                 if (cb->args[1]) {
 684                         cb->args[1] = 0;
 685                         goto restart;
 686                 }
 687         }
 688 out:
 689         spin_unlock_bh(&nf_conntrack_lock);
 690         if (last)
 691                 nf_ct_put(last);
 692
 693         return skb->len;
 694 }
 695
 696 static inline int
 697 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 698 {
 699         struct nlattr *tb[CTA_IP_MAX+1];
 700         struct nf_conntrack_l3proto *l3proto;
 701         int ret = 0;
 702
 703         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 704
 705         rcu_read_lock();
 706         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 707
 708         if (likely(l3proto->nlattr_to_tuple)) {
 709                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 710                                           l3proto->nla_policy);
 711                 if (ret == 0)
 712                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 713         }
 714
 715         rcu_read_unlock();
 716
 717         return ret;
 718 }
 719
 720 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 721         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 722 };
 723
 724 static inline int
 725 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 726                             struct nf_conntrack_tuple *tuple)
 727 {
 728         struct nlattr *tb[CTA_PROTO_MAX+1];
 729         struct nf_conntrack_l4proto *l4proto;
 730         int ret = 0;
 731
 732         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 733         if (ret < 0)
 734                 return ret;
 735
 736         if (!tb[CTA_PROTO_NUM])
 737                 return -EINVAL;
 738         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 739
 740         rcu_read_lock();
 741         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 742
 743         if (likely(l4proto->nlattr_to_tuple)) {
 744                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 745                                           l4proto->nla_policy);
 746                 if (ret == 0)
 747                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 748         }
 749
 750         rcu_read_unlock();
 751
 752         return ret;
 753 }
 754
 755 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 756         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 757         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 758 };
 759
 760 static int
 761 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 762                       struct nf_conntrack_tuple *tuple,
 763                       enum ctattr_tuple type, u_int8_t l3num)
 764 {
 765         struct nlattr *tb[CTA_TUPLE_MAX+1];
 766         int err;
 767
 768         memset(tuple, 0, sizeof(*tuple));
 769
 770         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 771
 772         if (!tb[CTA_TUPLE_IP])
 773                 return -EINVAL;
 774
 775         tuple->src.l3num = l3num;
 776
 777         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 778         if (err < 0)
 779                 return err;
 780
 781         if (!tb[CTA_TUPLE_PROTO])
 782                 return -EINVAL;
 783
 784         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 785         if (err < 0)
 786                 return err;
 787
 788         /* orig and expect tuples get DIR_ORIGINAL */
 789         if (type == CTA_TUPLE_REPLY)
 790                 tuple->dst.dir = IP_CT_DIR_REPLY;
 791         else
 792                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 793
 794         return 0;
 795 }
 796
 797 static int
 798 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 799 {
 800         if (attr)
 801 #ifdef CONFIG_NF_CONNTRACK_ZONES
 802                 *zone = ntohs(nla_get_be16(attr));
 803 #else
 804                 return -EOPNOTSUPP;
 805 #endif
 806         else
 807                 *zone = 0;
 808
 809         return 0;
 810 }
 811
 812 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 813         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 814 };
 815
 816 static inline int
 817 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 818 {
 819         struct nlattr *tb[CTA_HELP_MAX+1];
 820
 821         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 822
 823         if (!tb[CTA_HELP_NAME])
 824                 return -EINVAL;
 825
 826         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 827
 828         return 0;
 829 }
 830
 831 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 832         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 833         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 834         [CTA_STATUS]            = { .type = NLA_U32 },
 835         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 836         [CTA_HELP]              = { .type = NLA_NESTED },
 837         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 838         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 839         [CTA_MARK]              = { .type = NLA_U32 },
 840         [CTA_ID]                = { .type = NLA_U32 },
 841         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 842         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 843         [CTA_ZONE]              = { .type = NLA_U16 },
 844 };
 845
 846 static int
 847 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 848                         const struct nlmsghdr *nlh,
 849                         const struct nlattr * const cda[])
 850 {
 851         struct net *net = sock_net(ctnl);
 852         struct nf_conntrack_tuple_hash *h;
 853         struct nf_conntrack_tuple tuple;
 854         struct nf_conn *ct;
 855         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 856         u_int8_t u3 = nfmsg->nfgen_family;
 857         u16 zone;
 858         int err;
 859
 860         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 861         if (err < 0)
 862                 return err;
 863
 864         if (cda[CTA_TUPLE_ORIG])
 865                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 866         else if (cda[CTA_TUPLE_REPLY])
 867                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 868         else {
 869                 /* Flush the whole table */
 870                 nf_conntrack_flush_report(net,
 871                                          NETLINK_CB(skb).pid,
 872                                          nlmsg_report(nlh));
 873                 return 0;
 874         }
 875
 876         if (err < 0)
 877                 return err;
 878
 879         h = nf_conntrack_find_get(net, zone, &tuple);
 880         if (!h)
 881                 return -ENOENT;
 882
 883         ct = nf_ct_tuplehash_to_ctrack(h);
 884
 885         if (cda[CTA_ID]) {
 886                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 887                 if (id != (u32)(unsigned long)ct) {
 888                         nf_ct_put(ct);
 889                         return -ENOENT;
 890                 }
 891         }
 892
 893         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 894                                       NETLINK_CB(skb).pid,
 895                                       nlmsg_report(nlh)) < 0) {
 896                 nf_ct_delete_from_lists(ct);
 897                 /* we failed to report the event, try later */
 898                 nf_ct_insert_dying_list(ct);
 899                 nf_ct_put(ct);
 900                 return 0;
 901         }
 902
 903         /* death_by_timeout would report the event again */
 904         set_bit(IPS_DYING_BIT, &ct->status);
 905
 906         nf_ct_kill(ct);
 907         nf_ct_put(ct);
 908
 909         return 0;
 910 }
 911
 912 static int
 913 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 914                         const struct nlmsghdr *nlh,
 915                         const struct nlattr * const cda[])
 916 {
 917         struct net *net = sock_net(ctnl);
 918         struct nf_conntrack_tuple_hash *h;
 919         struct nf_conntrack_tuple tuple;
 920         struct nf_conn *ct;
 921         struct sk_buff *skb2 = NULL;
 922         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 923         u_int8_t u3 = nfmsg->nfgen_family;
 924         u16 zone;
 925         int err;
 926
 927         if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP)
 928                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 929                                           ctnetlink_done);
 930
 931         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 932         if (err < 0)
 933                 return err;
 934
 935         if (cda[CTA_TUPLE_ORIG])
 936                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 937         else if (cda[CTA_TUPLE_REPLY])
 938                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 939         else
 940                 return -EINVAL;
 941
 942         if (err < 0)
 943                 return err;
 944
 945         h = nf_conntrack_find_get(net, zone, &tuple);
 946         if (!h)
 947                 return -ENOENT;
 948
 949         ct = nf_ct_tuplehash_to_ctrack(h);
 950
 951         err = -ENOMEM;
 952         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 953         if (skb2 == NULL) {
 954                 nf_ct_put(ct);
 955                 return -ENOMEM;
 956         }
 957
 958         rcu_read_lock();
 959         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 960                                   IPCTNL_MSG_CT_NEW, ct);
 961         rcu_read_unlock();
 962         nf_ct_put(ct);
 963         if (err <= 0)
 964                 goto free;
 965
 966         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 967         if (err < 0)
 968                 goto out;
 969
 970         return 0;
 971
 972 free:
 973         kfree_skb(skb2);
 974 out:
 975         /* this avoids a loop in nfnetlink. */
 976         return err == -EAGAIN ? -ENOBUFS : err;
 977 }
 978
 979 #ifdef CONFIG_NF_NAT_NEEDED
 980 static int
 981 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 982                           enum nf_nat_manip_type manip,
 983                           const struct nlattr *attr)
 984 {
 985         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 986
 987         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 988         if (!parse_nat_setup) {
 989 #ifdef CONFIG_MODULES
 990                 rcu_read_unlock();
 991                 spin_unlock_bh(&nf_conntrack_lock);
 992                 nfnl_unlock();
 993                 if (request_module("nf-nat-ipv4") < 0) {
 994                         nfnl_lock();
 995                         spin_lock_bh(&nf_conntrack_lock);
 996                         rcu_read_lock();
 997                         return -EOPNOTSUPP;
 998                 }
 999                 nfnl_lock();
1000                 spin_lock_bh(&nf_conntrack_lock);
1001                 rcu_read_lock();
1002                 if (nfnetlink_parse_nat_setup_hook)
1003                         return -EAGAIN;
1004 #endif
1005                 return -EOPNOTSUPP;
1006         }
1007
1008         return parse_nat_setup(ct, manip, attr);
1009 }
1010 #endif
1011
1012 static int
1013 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1014 {
1015         unsigned long d;
1016         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1017         d = ct->status ^ status;
1018
1019         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1020                 /* unchangeable */
1021                 return -EBUSY;
1022
1023         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1024                 /* SEEN_REPLY bit can only be set */
1025                 return -EBUSY;
1026
1027         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1028                 /* ASSURED bit can only be set */
1029                 return -EBUSY;
1030
1031         /* Be careful here, modifying NAT bits can screw up things,
1032          * so don't let users modify them directly if they don't pass
1033          * nf_nat_range. */
1034         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1035         return 0;
1036 }
1037
1038 static int
1039 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1040 {
1041 #ifdef CONFIG_NF_NAT_NEEDED
1042         int ret;
1043
1044         if (cda[CTA_NAT_DST]) {
1045                 ret = ctnetlink_parse_nat_setup(ct,
1046                                                 IP_NAT_MANIP_DST,
1047                                                 cda[CTA_NAT_DST]);
1048                 if (ret < 0)
1049                         return ret;
1050         }
1051         if (cda[CTA_NAT_SRC]) {
1052                 ret = ctnetlink_parse_nat_setup(ct,
1053                                                 IP_NAT_MANIP_SRC,
1054                                                 cda[CTA_NAT_SRC]);
1055                 if (ret < 0)
1056                         return ret;
1057         }
1058         return 0;
1059 #else
1060         return -EOPNOTSUPP;
1061 #endif
1062 }
1063
1064 static inline int
1065 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1066 {
1067         struct nf_conntrack_helper *helper;
1068         struct nf_conn_help *help = nfct_help(ct);
1069         char *helpname = NULL;
1070         int err;
1071
1072         /* don't change helper of sibling connections */
1073         if (ct->master)
1074                 return -EBUSY;
1075
1076         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1077         if (err < 0)
1078                 return err;
1079
1080         if (!strcmp(helpname, "")) {
1081                 if (help && help->helper) {
1082                         /* we had a helper before ... */
1083                         nf_ct_remove_expectations(ct);
1084                         rcu_assign_pointer(help->helper, NULL);
1085                 }
1086
1087                 return 0;
1088         }
1089
1090         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1091                                             nf_ct_protonum(ct));
1092         if (helper == NULL) {
1093 #ifdef CONFIG_MODULES
1094                 spin_unlock_bh(&nf_conntrack_lock);
1095
1096                 if (request_module("nfct-helper-%s", helpname) < 0) {
1097                         spin_lock_bh(&nf_conntrack_lock);
1098                         return -EOPNOTSUPP;
1099                 }
1100
1101                 spin_lock_bh(&nf_conntrack_lock);
1102                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1103                                                     nf_ct_protonum(ct));
1104                 if (helper)
1105                         return -EAGAIN;
1106 #endif
1107                 return -EOPNOTSUPP;
1108         }
1109
1110         if (help) {
1111                 if (help->helper == helper)
1112                         return 0;
1113                 if (help->helper)
1114                         return -EBUSY;
1115                 /* need to zero data of old helper */
1116                 memset(&help->help, 0, sizeof(help->help));
1117         } else {
1118                 /* we cannot set a helper for an existing conntrack */
1119                 return -EOPNOTSUPP;
1120         }
1121
1122         rcu_assign_pointer(help->helper, helper);
1123
1124         return 0;
1125 }
1126
1127 static inline int
1128 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1129 {
1130         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1131
1132         if (!del_timer(&ct->timeout))
1133                 return -ETIME;
1134
1135         ct->timeout.expires = jiffies + timeout * HZ;
1136         add_timer(&ct->timeout);
1137
1138         return 0;
1139 }
1140
1141 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1142         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1143         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1144         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1145 };
1146
1147 static inline int
1148 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1149 {
1150         const struct nlattr *attr = cda[CTA_PROTOINFO];
1151         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1152         struct nf_conntrack_l4proto *l4proto;
1153         int err = 0;
1154
1155         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1156
1157         rcu_read_lock();
1158         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1159         if (l4proto->from_nlattr)
1160                 err = l4proto->from_nlattr(tb, ct);
1161         rcu_read_unlock();
1162
1163         return err;
1164 }
1165
1166 #ifdef CONFIG_NF_NAT_NEEDED
1167 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1168         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1169         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1170         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1171 };
1172
1173 static inline int
1174 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1175 {
1176         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1177
1178         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1179
1180         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1181                 return -EINVAL;
1182
1183         natseq->correction_pos =
1184                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1185
1186         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1187                 return -EINVAL;
1188
1189         natseq->offset_before =
1190                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1191
1192         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1193                 return -EINVAL;
1194
1195         natseq->offset_after =
1196                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1197
1198         return 0;
1199 }
1200
1201 static int
1202 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1203                              const struct nlattr * const cda[])
1204 {
1205         int ret = 0;
1206         struct nf_conn_nat *nat = nfct_nat(ct);
1207
1208         if (!nat)
1209                 return 0;
1210
1211         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1212                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1213                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1214                 if (ret < 0)
1215                         return ret;
1216
1217                 ct->status |= IPS_SEQ_ADJUST;
1218         }
1219
1220         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1221                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1222                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1223                 if (ret < 0)
1224                         return ret;
1225
1226                 ct->status |= IPS_SEQ_ADJUST;
1227         }
1228
1229         return 0;
1230 }
1231 #endif
1232
1233 static int
1234 ctnetlink_change_conntrack(struct nf_conn *ct,
1235                            const struct nlattr * const cda[])
1236 {
1237         int err;
1238
1239         /* only allow NAT changes and master assignation for new conntracks */
1240         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1241                 return -EOPNOTSUPP;
1242
1243         if (cda[CTA_HELP]) {
1244                 err = ctnetlink_change_helper(ct, cda);
1245                 if (err < 0)
1246                         return err;
1247         }
1248
1249         if (cda[CTA_TIMEOUT]) {
1250                 err = ctnetlink_change_timeout(ct, cda);
1251                 if (err < 0)
1252                         return err;
1253         }
1254
1255         if (cda[CTA_STATUS]) {
1256                 err = ctnetlink_change_status(ct, cda);
1257                 if (err < 0)
1258                         return err;
1259         }
1260
1261         if (cda[CTA_PROTOINFO]) {
1262                 err = ctnetlink_change_protoinfo(ct, cda);
1263                 if (err < 0)
1264                         return err;
1265         }
1266
1267 #if defined(CONFIG_NF_CONNTRACK_MARK)
1268         if (cda[CTA_MARK])
1269                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1270 #endif
1271
1272 #ifdef CONFIG_NF_NAT_NEEDED
1273         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1274                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1275                 if (err < 0)
1276                         return err;
1277         }
1278 #endif
1279
1280         return 0;
1281 }
1282
1283 static struct nf_conn *
1284 ctnetlink_create_conntrack(struct net *net, u16 zone,
1285                            const struct nlattr * const cda[],
1286                            struct nf_conntrack_tuple *otuple,
1287                            struct nf_conntrack_tuple *rtuple,
1288                            u8 u3)
1289 {
1290         struct nf_conn *ct;
1291         int err = -EINVAL;
1292         struct nf_conntrack_helper *helper;
1293
1294         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1295         if (IS_ERR(ct))
1296                 return ERR_PTR(-ENOMEM);
1297
1298         if (!cda[CTA_TIMEOUT])
1299                 goto err1;
1300         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1301
1302         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1303
1304         rcu_read_lock();
1305         if (cda[CTA_HELP]) {
1306                 char *helpname = NULL;
1307
1308                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1309                 if (err < 0)
1310                         goto err2;
1311
1312                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1313                                                     nf_ct_protonum(ct));
1314                 if (helper == NULL) {
1315                         rcu_read_unlock();
1316 #ifdef CONFIG_MODULES
1317                         if (request_module("nfct-helper-%s", helpname) < 0) {
1318                                 err = -EOPNOTSUPP;
1319                                 goto err1;
1320                         }
1321
1322                         rcu_read_lock();
1323                         helper = __nf_conntrack_helper_find(helpname,
1324                                                             nf_ct_l3num(ct),
1325                                                             nf_ct_protonum(ct));
1326                         if (helper) {
1327                                 err = -EAGAIN;
1328                                 goto err2;
1329                         }
1330                         rcu_read_unlock();
1331 #endif
1332                         err = -EOPNOTSUPP;
1333                         goto err1;
1334                 } else {
1335                         struct nf_conn_help *help;
1336
1337                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1338                         if (help == NULL) {
1339                                 err = -ENOMEM;
1340                                 goto err2;
1341                         }
1342
1343                         /* not in hash table yet so not strictly necessary */
1344                         rcu_assign_pointer(help->helper, helper);
1345                 }
1346         } else {
1347                 /* try an implicit helper assignation */
1348                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1349                 if (err < 0)
1350                         goto err2;
1351         }
1352
1353         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1354                 err = ctnetlink_change_nat(ct, cda);
1355                 if (err < 0)
1356                         goto err2;
1357         }
1358
1359         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1360         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1361         /* we must add conntrack extensions before confirmation. */
1362         ct->status |= IPS_CONFIRMED;
1363
1364         if (cda[CTA_STATUS]) {
1365                 err = ctnetlink_change_status(ct, cda);
1366                 if (err < 0)
1367                         goto err2;
1368         }
1369
1370 #ifdef CONFIG_NF_NAT_NEEDED
1371         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1372                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1373                 if (err < 0)
1374                         goto err2;
1375         }
1376 #endif
1377
1378         if (cda[CTA_PROTOINFO]) {
1379                 err = ctnetlink_change_protoinfo(ct, cda);
1380                 if (err < 0)
1381                         goto err2;
1382         }
1383
1384 #if defined(CONFIG_NF_CONNTRACK_MARK)
1385         if (cda[CTA_MARK])
1386                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1387 #endif
1388
1389         /* setup master conntrack: this is a confirmed expectation */
1390         if (cda[CTA_TUPLE_MASTER]) {
1391                 struct nf_conntrack_tuple master;
1392                 struct nf_conntrack_tuple_hash *master_h;
1393                 struct nf_conn *master_ct;
1394
1395                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1396                 if (err < 0)
1397                         goto err2;
1398
1399                 master_h = nf_conntrack_find_get(net, zone, &master);
1400                 if (master_h == NULL) {
1401                         err = -ENOENT;
1402                         goto err2;
1403                 }
1404                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1405                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1406                 ct->master = master_ct;
1407         }
1408
1409         add_timer(&ct->timeout);
1410         nf_conntrack_hash_insert(ct);
1411         rcu_read_unlock();
1412
1413         return ct;
1414
1415 err2:
1416         rcu_read_unlock();
1417 err1:
1418         nf_conntrack_free(ct);
1419         return ERR_PTR(err);
1420 }
1421
1422 static int
1423 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1424                         const struct nlmsghdr *nlh,
1425                         const struct nlattr * const cda[])
1426 {
1427         struct net *net = sock_net(ctnl);
1428         struct nf_conntrack_tuple otuple, rtuple;
1429         struct nf_conntrack_tuple_hash *h = NULL;
1430         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1431         u_int8_t u3 = nfmsg->nfgen_family;
1432         u16 zone;
1433         int err;
1434
1435         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1436         if (err < 0)
1437                 return err;
1438
1439         if (cda[CTA_TUPLE_ORIG]) {
1440                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1441                 if (err < 0)
1442                         return err;
1443         }
1444
1445         if (cda[CTA_TUPLE_REPLY]) {
1446                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1447                 if (err < 0)
1448                         return err;
1449         }
1450
1451         spin_lock_bh(&nf_conntrack_lock);
1452         if (cda[CTA_TUPLE_ORIG])
1453                 h = __nf_conntrack_find(net, zone, &otuple);
1454         else if (cda[CTA_TUPLE_REPLY])
1455                 h = __nf_conntrack_find(net, zone, &rtuple);
1456
1457         if (h == NULL) {
1458                 err = -ENOENT;
1459                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1460                         struct nf_conn *ct;
1461                         enum ip_conntrack_events events;
1462
1463                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1464                                                         &rtuple, u3);
1465                         if (IS_ERR(ct)) {
1466                                 err = PTR_ERR(ct);
1467                                 goto out_unlock;
1468                         }
1469                         err = 0;
1470                         nf_conntrack_get(&ct->ct_general);
1471                         spin_unlock_bh(&nf_conntrack_lock);
1472                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1473                                 events = IPCT_RELATED;
1474                         else
1475                                 events = IPCT_NEW;
1476
1477                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1478                                                       (1 << IPCT_ASSURED) |
1479                                                       (1 << IPCT_HELPER) |
1480                                                       (1 << IPCT_PROTOINFO) |
1481                                                       (1 << IPCT_NATSEQADJ) |
1482                                                       (1 << IPCT_MARK) | events,
1483                                                       ct, NETLINK_CB(skb).pid,
1484                                                       nlmsg_report(nlh));
1485                         nf_ct_put(ct);
1486                 } else
1487                         spin_unlock_bh(&nf_conntrack_lock);
1488
1489                 return err;
1490         }
1491         /* implicit 'else' */
1492
1493         /* We manipulate the conntrack inside the global conntrack table lock,
1494          * so there's no need to increase the refcount */
1495         err = -EEXIST;
1496         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1497                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1498
1499                 err = ctnetlink_change_conntrack(ct, cda);
1500                 if (err == 0) {
1501                         nf_conntrack_get(&ct->ct_general);
1502                         spin_unlock_bh(&nf_conntrack_lock);
1503                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1504                                                       (1 << IPCT_ASSURED) |
1505                                                       (1 << IPCT_HELPER) |
1506                                                       (1 << IPCT_PROTOINFO) |
1507                                                       (1 << IPCT_NATSEQADJ) |
1508                                                       (1 << IPCT_MARK),
1509                                                       ct, NETLINK_CB(skb).pid,
1510                                                       nlmsg_report(nlh));
1511                         nf_ct_put(ct);
1512                 } else
1513                         spin_unlock_bh(&nf_conntrack_lock);
1514
1515                 return err;
1516         }
1517
1518 out_unlock:
1519         spin_unlock_bh(&nf_conntrack_lock);
1520         return err;
1521 }
1522
1523 /***********************************************************************
1524  * EXPECT
1525  ***********************************************************************/
1526
1527 static inline int
1528 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1529                          const struct nf_conntrack_tuple *tuple,
1530                          enum ctattr_expect type)
1531 {
1532         struct nlattr *nest_parms;
1533
1534         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1535         if (!nest_parms)
1536                 goto nla_put_failure;
1537         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1538                 goto nla_put_failure;
1539         nla_nest_end(skb, nest_parms);
1540
1541         return 0;
1542
1543 nla_put_failure:
1544         return -1;
1545 }
1546
1547 static inline int
1548 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1549                         const struct nf_conntrack_tuple *tuple,
1550                         const struct nf_conntrack_tuple_mask *mask)
1551 {
1552         int ret;
1553         struct nf_conntrack_l3proto *l3proto;
1554         struct nf_conntrack_l4proto *l4proto;
1555         struct nf_conntrack_tuple m;
1556         struct nlattr *nest_parms;
1557
1558         memset(&m, 0xFF, sizeof(m));
1559         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1560         m.src.u.all = mask->src.u.all;
1561         m.dst.protonum = tuple->dst.protonum;
1562
1563         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1564         if (!nest_parms)
1565                 goto nla_put_failure;
1566
1567         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1568         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1569
1570         if (unlikely(ret < 0))
1571                 goto nla_put_failure;
1572
1573         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1574         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1575         if (unlikely(ret < 0))
1576                 goto nla_put_failure;
1577
1578         nla_nest_end(skb, nest_parms);
1579
1580         return 0;
1581
1582 nla_put_failure:
1583         return -1;
1584 }
1585
1586 static int
1587 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1588                           const struct nf_conntrack_expect *exp)
1589 {
1590         struct nf_conn *master = exp->master;
1591         long timeout = (exp->timeout.expires - jiffies) / HZ;
1592         struct nf_conn_help *help;
1593
1594         if (timeout < 0)
1595                 timeout = 0;
1596
1597         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1598                 goto nla_put_failure;
1599         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1600                 goto nla_put_failure;
1601         if (ctnetlink_exp_dump_tuple(skb,
1602                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1603                                  CTA_EXPECT_MASTER) < 0)
1604                 goto nla_put_failure;
1605
1606         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1607         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1608         NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1609         help = nfct_help(master);
1610         if (help) {
1611                 struct nf_conntrack_helper *helper;
1612
1613                 helper = rcu_dereference(help->helper);
1614                 if (helper)
1615                         NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1616         }
1617
1618         return 0;
1619
1620 nla_put_failure:
1621         return -1;
1622 }
1623
1624 static int
1625 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1626                         int event, const struct nf_conntrack_expect *exp)
1627 {
1628         struct nlmsghdr *nlh;
1629         struct nfgenmsg *nfmsg;
1630         unsigned int flags = pid ? NLM_F_MULTI : 0;
1631
1632         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1633         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1634         if (nlh == NULL)
1635                 goto nlmsg_failure;
1636
1637         nfmsg = nlmsg_data(nlh);
1638         nfmsg->nfgen_family = exp->tuple.src.l3num;
1639         nfmsg->version      = NFNETLINK_V0;
1640         nfmsg->res_id       = 0;
1641
1642         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1643                 goto nla_put_failure;
1644
1645         nlmsg_end(skb, nlh);
1646         return skb->len;
1647
1648 nlmsg_failure:
1649 nla_put_failure:
1650         nlmsg_cancel(skb, nlh);
1651         return -1;
1652 }
1653
1654 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1655 static int
1656 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1657 {
1658         struct nf_conntrack_expect *exp = item->exp;
1659         struct net *net = nf_ct_exp_net(exp);
1660         struct nlmsghdr *nlh;
1661         struct nfgenmsg *nfmsg;
1662         struct sk_buff *skb;
1663         unsigned int type, group;
1664         int flags = 0;
1665
1666         if (events & (1 << IPEXP_DESTROY)) {
1667                 type = IPCTNL_MSG_EXP_DELETE;
1668                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1669         } else if (events & (1 << IPEXP_NEW)) {
1670                 type = IPCTNL_MSG_EXP_NEW;
1671                 flags = NLM_F_CREATE|NLM_F_EXCL;
1672                 group = NFNLGRP_CONNTRACK_EXP_NEW;
1673         } else
1674                 return 0;
1675
1676         if (!item->report && !nfnetlink_has_listeners(net, group))
1677                 return 0;
1678
1679         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1680         if (skb == NULL)
1681                 goto errout;
1682
1683         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1684         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1685         if (nlh == NULL)
1686                 goto nlmsg_failure;
1687
1688         nfmsg = nlmsg_data(nlh);
1689         nfmsg->nfgen_family = exp->tuple.src.l3num;
1690         nfmsg->version      = NFNETLINK_V0;
1691         nfmsg->res_id       = 0;
1692
1693         rcu_read_lock();
1694         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1695                 goto nla_put_failure;
1696         rcu_read_unlock();
1697
1698         nlmsg_end(skb, nlh);
1699         nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1700         return 0;
1701
1702 nla_put_failure:
1703         rcu_read_unlock();
1704         nlmsg_cancel(skb, nlh);
1705 nlmsg_failure:
1706         kfree_skb(skb);
1707 errout:
1708         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1709         return 0;
1710 }
1711 #endif
1712 static int ctnetlink_exp_done(struct netlink_callback *cb)
1713 {
1714         if (cb->args[1])
1715                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1716         return 0;
1717 }
1718
1719 static int
1720 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1721 {
1722         struct net *net = sock_net(skb->sk);
1723         struct nf_conntrack_expect *exp, *last;
1724         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1725         struct hlist_node *n;
1726         u_int8_t l3proto = nfmsg->nfgen_family;
1727
1728         rcu_read_lock();
1729         last = (struct nf_conntrack_expect *)cb->args[1];
1730         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1731 restart:
1732                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1733                                      hnode) {
1734                         if (l3proto && exp->tuple.src.l3num != l3proto)
1735                                 continue;
1736                         if (cb->args[1]) {
1737                                 if (exp != last)
1738                                         continue;
1739                                 cb->args[1] = 0;
1740                         }
1741                         if (ctnetlink_exp_fill_info(skb,
1742                                                     NETLINK_CB(cb->skb).pid,
1743                                                     cb->nlh->nlmsg_seq,
1744                                                     IPCTNL_MSG_EXP_NEW,
1745                                                     exp) < 0) {
1746                                 if (!atomic_inc_not_zero(&exp->use))
1747                                         continue;
1748                                 cb->args[1] = (unsigned long)exp;
1749                                 goto out;
1750                         }
1751                 }
1752                 if (cb->args[1]) {
1753                         cb->args[1] = 0;
1754                         goto restart;
1755                 }
1756         }
1757 out:
1758         rcu_read_unlock();
1759         if (last)
1760                 nf_ct_expect_put(last);
1761
1762         return skb->len;
1763 }
1764
1765 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1766         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1767         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1768         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1769         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1770         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1771         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1772         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1773         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1774 };
1775
1776 static int
1777 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1778                      const struct nlmsghdr *nlh,
1779                      const struct nlattr * const cda[])
1780 {
1781         struct net *net = sock_net(ctnl);
1782         struct nf_conntrack_tuple tuple;
1783         struct nf_conntrack_expect *exp;
1784         struct sk_buff *skb2;
1785         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1786         u_int8_t u3 = nfmsg->nfgen_family;
1787         u16 zone;
1788         int err;
1789
1790         if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
1791                 return netlink_dump_start(ctnl, skb, nlh,
1792                                           ctnetlink_exp_dump_table,
1793                                           ctnetlink_exp_done);
1794         }
1795
1796         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1797         if (err < 0)
1798                 return err;
1799
1800         if (cda[CTA_EXPECT_MASTER])
1801                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1802         else
1803                 return -EINVAL;
1804
1805         if (err < 0)
1806                 return err;
1807
1808         exp = nf_ct_expect_find_get(net, zone, &tuple);
1809         if (!exp)
1810                 return -ENOENT;
1811
1812         if (cda[CTA_EXPECT_ID]) {
1813                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1814                 if (ntohl(id) != (u32)(unsigned long)exp) {
1815                         nf_ct_expect_put(exp);
1816                         return -ENOENT;
1817                 }
1818         }
1819
1820         err = -ENOMEM;
1821         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1822         if (skb2 == NULL)
1823                 goto out;
1824
1825         rcu_read_lock();
1826         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1827                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1828         rcu_read_unlock();
1829         if (err <= 0)
1830                 goto free;
1831
1832         nf_ct_expect_put(exp);
1833
1834         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1835
1836 free:
1837         kfree_skb(skb2);
1838 out:
1839         nf_ct_expect_put(exp);
1840         return err;
1841 }
1842
1843 static int
1844 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1845                      const struct nlmsghdr *nlh,
1846                      const struct nlattr * const cda[])
1847 {
1848         struct net *net = sock_net(ctnl);
1849         struct nf_conntrack_expect *exp;
1850         struct nf_conntrack_tuple tuple;
1851         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1852         struct hlist_node *n, *next;
1853         u_int8_t u3 = nfmsg->nfgen_family;
1854         unsigned int i;
1855         u16 zone;
1856         int err;
1857
1858         if (cda[CTA_EXPECT_TUPLE]) {
1859                 /* delete a single expect by tuple */
1860                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1861                 if (err < 0)
1862                         return err;
1863
1864                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1865                 if (err < 0)
1866                         return err;
1867
1868                 /* bump usage count to 2 */
1869                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1870                 if (!exp)
1871                         return -ENOENT;
1872
1873                 if (cda[CTA_EXPECT_ID]) {
1874                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1875                         if (ntohl(id) != (u32)(unsigned long)exp) {
1876                                 nf_ct_expect_put(exp);
1877                                 return -ENOENT;
1878                         }
1879                 }
1880
1881                 /* after list removal, usage count == 1 */
1882                 spin_lock_bh(&nf_conntrack_lock);
1883                 if (del_timer(&exp->timeout)) {
1884                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1885                                                    nlmsg_report(nlh));
1886                         nf_ct_expect_put(exp);
1887                 }
1888                 spin_unlock_bh(&nf_conntrack_lock);
1889                 /* have to put what we 'get' above.
1890                  * after this line usage count == 0 */
1891                 nf_ct_expect_put(exp);
1892         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1893                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1894                 struct nf_conn_help *m_help;
1895
1896                 /* delete all expectations for this helper */
1897                 spin_lock_bh(&nf_conntrack_lock);
1898                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1899                         hlist_for_each_entry_safe(exp, n, next,
1900                                                   &net->ct.expect_hash[i],
1901                                                   hnode) {
1902                                 m_help = nfct_help(exp->master);
1903                                 if (!strcmp(m_help->helper->name, name) &&
1904                                     del_timer(&exp->timeout)) {
1905                                         nf_ct_unlink_expect_report(exp,
1906                                                         NETLINK_CB(skb).pid,
1907                                                         nlmsg_report(nlh));
1908                                         nf_ct_expect_put(exp);
1909                                 }
1910                         }
1911                 }
1912                 spin_unlock_bh(&nf_conntrack_lock);
1913         } else {
1914                 /* This basically means we have to flush everything*/
1915                 spin_lock_bh(&nf_conntrack_lock);
1916                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1917                         hlist_for_each_entry_safe(exp, n, next,
1918                                                   &net->ct.expect_hash[i],
1919                                                   hnode) {
1920                                 if (del_timer(&exp->timeout)) {
1921                                         nf_ct_unlink_expect_report(exp,
1922                                                         NETLINK_CB(skb).pid,
1923                                                         nlmsg_report(nlh));
1924                                         nf_ct_expect_put(exp);
1925                                 }
1926                         }
1927                 }
1928                 spin_unlock_bh(&nf_conntrack_lock);
1929         }
1930
1931         return 0;
1932 }
1933 static int
1934 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1935                         const struct nlattr * const cda[])
1936 {
1937         return -EOPNOTSUPP;
1938 }
1939
1940 static int
1941 ctnetlink_create_expect(struct net *net, u16 zone,
1942                         const struct nlattr * const cda[],
1943                         u_int8_t u3,
1944                         u32 pid, int report)
1945 {
1946         struct nf_conntrack_tuple tuple, mask, master_tuple;
1947         struct nf_conntrack_tuple_hash *h = NULL;
1948         struct nf_conntrack_expect *exp;
1949         struct nf_conn *ct;
1950         struct nf_conn_help *help;
1951         int err = 0;
1952
1953         /* caller guarantees that those three CTA_EXPECT_* exist */
1954         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1955         if (err < 0)
1956                 return err;
1957         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1958         if (err < 0)
1959                 return err;
1960         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1961         if (err < 0)
1962                 return err;
1963
1964         /* Look for master conntrack of this expectation */
1965         h = nf_conntrack_find_get(net, zone, &master_tuple);
1966         if (!h)
1967                 return -ENOENT;
1968         ct = nf_ct_tuplehash_to_ctrack(h);
1969         exp = nf_ct_expect_alloc(ct);
1970         if (!exp) {
1971                 err = -ENOMEM;
1972                 goto out;
1973         }
1974         help = nfct_help(ct);
1975         if (!help) {
1976                 if (!cda[CTA_EXPECT_TIMEOUT]) {
1977                         err = -EINVAL;
1978                         goto out;
1979                 }
1980                 exp->timeout.expires =
1981                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1982
1983                 exp->flags = NF_CT_EXPECT_USERSPACE;
1984                 if (cda[CTA_EXPECT_FLAGS]) {
1985                         exp->flags |=
1986                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1987                 }
1988         } else {
1989                 if (cda[CTA_EXPECT_FLAGS]) {
1990                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1991                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1992                 } else
1993                         exp->flags = 0;
1994         }
1995
1996         exp->class = 0;
1997         exp->expectfn = NULL;
1998         exp->master = ct;
1999         exp->helper = NULL;
2000         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2001         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2002         exp->mask.src.u.all = mask.src.u.all;
2003
2004         err = nf_ct_expect_related_report(exp, pid, report);
2005         nf_ct_expect_put(exp);
2006
2007 out:
2008         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2009         return err;
2010 }
2011
2012 static int
2013 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2014                      const struct nlmsghdr *nlh,
2015                      const struct nlattr * const cda[])
2016 {
2017         struct net *net = sock_net(ctnl);
2018         struct nf_conntrack_tuple tuple;
2019         struct nf_conntrack_expect *exp;
2020         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2021         u_int8_t u3 = nfmsg->nfgen_family;
2022         u16 zone;
2023         int err;
2024
2025         if (!cda[CTA_EXPECT_TUPLE]
2026             || !cda[CTA_EXPECT_MASK]
2027             || !cda[CTA_EXPECT_MASTER])
2028                 return -EINVAL;
2029
2030         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2031         if (err < 0)
2032                 return err;
2033
2034         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2035         if (err < 0)
2036                 return err;
2037
2038         spin_lock_bh(&nf_conntrack_lock);
2039         exp = __nf_ct_expect_find(net, zone, &tuple);
2040
2041         if (!exp) {
2042                 spin_unlock_bh(&nf_conntrack_lock);
2043                 err = -ENOENT;
2044                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2045                         err = ctnetlink_create_expect(net, zone, cda,
2046                                                       u3,
2047                                                       NETLINK_CB(skb).pid,
2048                                                       nlmsg_report(nlh));
2049                 }
2050                 return err;
2051         }
2052
2053         err = -EEXIST;
2054         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2055                 err = ctnetlink_change_expect(exp, cda);
2056         spin_unlock_bh(&nf_conntrack_lock);
2057
2058         return err;
2059 }
2060
2061 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2062 static struct nf_ct_event_notifier ctnl_notifier = {
2063         .fcn = ctnetlink_conntrack_event,
2064 };
2065
2066 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2067         .fcn = ctnetlink_expect_event,
2068 };
2069 #endif
2070
2071 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2072         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2073                                             .attr_count = CTA_MAX,
2074                                             .policy = ct_nla_policy },
2075         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2076                                             .attr_count = CTA_MAX,
2077                                             .policy = ct_nla_policy },
2078         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2079                                             .attr_count = CTA_MAX,
2080                                             .policy = ct_nla_policy },
2081         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2082                                             .attr_count = CTA_MAX,
2083                                             .policy = ct_nla_policy },
2084 };
2085
2086 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2087         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2088                                             .attr_count = CTA_EXPECT_MAX,
2089                                             .policy = exp_nla_policy },
2090         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2091                                             .attr_count = CTA_EXPECT_MAX,
2092                                             .policy = exp_nla_policy },
2093         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2094                                             .attr_count = CTA_EXPECT_MAX,
2095                                             .policy = exp_nla_policy },
2096 };
2097
2098 static const struct nfnetlink_subsystem ctnl_subsys = {
2099         .name                           = "conntrack",
2100         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2101         .cb_count                       = IPCTNL_MSG_MAX,
2102         .cb                             = ctnl_cb,
2103 };
2104
2105 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2106         .name                           = "conntrack_expect",
2107         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2108         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2109         .cb                             = ctnl_exp_cb,
2110 };
2111
2112 MODULE_ALIAS("ip_conntrack_netlink");
2113 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2114 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2115
2116 static int __init ctnetlink_init(void)
2117 {
2118         int ret;
2119
2120         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2121         ret = nfnetlink_subsys_register(&ctnl_subsys);
2122         if (ret < 0) {
2123                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2124                 goto err_out;
2125         }
2126
2127         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2128         if (ret < 0) {
2129                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2130                 goto err_unreg_subsys;
2131         }
2132
2133 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2134         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2135         if (ret < 0) {
2136                 pr_err("ctnetlink_init: cannot register notifier.\n");
2137                 goto err_unreg_exp_subsys;
2138         }
2139
2140         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2141         if (ret < 0) {
2142                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2143                 goto err_unreg_notifier;
2144         }
2145 #endif
2146
2147         return 0;
2148
2149 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2150 err_unreg_notifier:
2151         nf_conntrack_unregister_notifier(&ctnl_notifier);
2152 err_unreg_exp_subsys:
2153         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2154 #endif
2155 err_unreg_subsys:
2156         nfnetlink_subsys_unregister(&ctnl_subsys);
2157 err_out:
2158         return ret;
2159 }
2160
2161 static void __exit ctnetlink_exit(void)
2162 {
2163         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2164
2165         nf_ct_remove_userspace_expectations();
2166 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2167         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2168         nf_conntrack_unregister_notifier(&ctnl_notifier);
2169 #endif
2170
2171         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2172         nfnetlink_subsys_unregister(&ctnl_subsys);
2173 }
2174
2175 module_init(ctnetlink_init);
2176 module_exit(ctnetlink_exit);