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
 532         /* container deinit, netlink may have died before death_by_timeout */
 533         if (!net->nfnl)
 534                 return 0;
 535
 536         if (!item->report && !nfnetlink_has_listeners(net, group))
 537                 return 0;
 538
 539         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 540         if (skb == NULL)
 541                 goto errout;
 542
 543         type |= NFNL_SUBSYS_CTNETLINK << 8;
 544         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
 545         if (nlh == NULL)
 546                 goto nlmsg_failure;
 547
 548         nfmsg = nlmsg_data(nlh);
 549         nfmsg->nfgen_family = nf_ct_l3num(ct);
 550         nfmsg->version  = NFNETLINK_V0;
 551         nfmsg->res_id   = 0;
 552
 553         rcu_read_lock();
 554         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 555         if (!nest_parms)
 556                 goto nla_put_failure;
 557         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 558                 goto nla_put_failure;
 559         nla_nest_end(skb, nest_parms);
 560
 561         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 562         if (!nest_parms)
 563                 goto nla_put_failure;
 564         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 565                 goto nla_put_failure;
 566         nla_nest_end(skb, nest_parms);
 567
 568         if (nf_ct_zone(ct))
 569                 NLA_PUT_BE16(skb, CTA_ZONE, htons(nf_ct_zone(ct)));
 570
 571         if (ctnetlink_dump_id(skb, ct) < 0)
 572                 goto nla_put_failure;
 573
 574         if (ctnetlink_dump_status(skb, ct) < 0)
 575                 goto nla_put_failure;
 576
 577         if (events & (1 << IPCT_DESTROY)) {
 578                 if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 579                     ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 580                         goto nla_put_failure;
 581         } else {
 582                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 583                         goto nla_put_failure;
 584
 585                 if (events & (1 << IPCT_PROTOINFO)
 586                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 587                         goto nla_put_failure;
 588
 589                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 590                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 591                         goto nla_put_failure;
 592
 593 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 594                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 595                     && ctnetlink_dump_secctx(skb, ct) < 0)
 596                         goto nla_put_failure;
 597 #endif
 598
 599                 if (events & (1 << IPCT_RELATED) &&
 600                     ctnetlink_dump_master(skb, ct) < 0)
 601                         goto nla_put_failure;
 602
 603                 if (events & (1 << IPCT_NATSEQADJ) &&
 604                     ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 605                         goto nla_put_failure;
 606         }
 607
 608 #ifdef CONFIG_NF_CONNTRACK_MARK
 609         if ((events & (1 << IPCT_MARK) || ct->mark)
 610             && ctnetlink_dump_mark(skb, ct) < 0)
 611                 goto nla_put_failure;
 612 #endif
 613         rcu_read_unlock();
 614
 615         nlmsg_end(skb, nlh);
 616         err = nfnetlink_send(skb, net, item->pid, group, item->report,
 617                              GFP_ATOMIC);
 618         if (err == -ENOBUFS || err == -EAGAIN)
 619                 return -ENOBUFS;
 620
 621         return 0;
 622
 623 nla_put_failure:
 624         rcu_read_unlock();
 625         nlmsg_cancel(skb, nlh);
 626 nlmsg_failure:
 627         kfree_skb(skb);
 628 errout:
 629         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 630                 return -ENOBUFS;
 631
 632         return 0;
 633 }
 634 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 635
 636 static int ctnetlink_done(struct netlink_callback *cb)
 637 {
 638         if (cb->args[1])
 639                 nf_ct_put((struct nf_conn *)cb->args[1]);
 640         return 0;
 641 }
 642
 643 static int
 644 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 645 {
 646         struct net *net = sock_net(skb->sk);
 647         struct nf_conn *ct, *last;
 648         struct nf_conntrack_tuple_hash *h;
 649         struct hlist_nulls_node *n;
 650         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 651         u_int8_t l3proto = nfmsg->nfgen_family;
 652
 653         spin_lock_bh(&nf_conntrack_lock);
 654         last = (struct nf_conn *)cb->args[1];
 655         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 656 restart:
 657                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 658                                          hnnode) {
 659                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 660                                 continue;
 661                         ct = nf_ct_tuplehash_to_ctrack(h);
 662                         /* Dump entries of a given L3 protocol number.
 663                          * If it is not specified, ie. l3proto == 0,
 664                          * then dump everything. */
 665                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 666                                 continue;
 667                         if (cb->args[1]) {
 668                                 if (ct != last)
 669                                         continue;
 670                                 cb->args[1] = 0;
 671                         }
 672                         if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 673                                                 cb->nlh->nlmsg_seq,
 674                                                 IPCTNL_MSG_CT_NEW, ct) < 0) {
 675                                 nf_conntrack_get(&ct->ct_general);
 676                                 cb->args[1] = (unsigned long)ct;
 677                                 goto out;
 678                         }
 679
 680                         if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 681                                                 IPCTNL_MSG_CT_GET_CTRZERO) {
 682                                 struct nf_conn_counter *acct;
 683
 684                                 acct = nf_conn_acct_find(ct);
 685                                 if (acct)
 686                                         memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 687                         }
 688                 }
 689                 if (cb->args[1]) {
 690                         cb->args[1] = 0;
 691                         goto restart;
 692                 }
 693         }
 694 out:
 695         spin_unlock_bh(&nf_conntrack_lock);
 696         if (last)
 697                 nf_ct_put(last);
 698
 699         return skb->len;
 700 }
 701
 702 static inline int
 703 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 704 {
 705         struct nlattr *tb[CTA_IP_MAX+1];
 706         struct nf_conntrack_l3proto *l3proto;
 707         int ret = 0;
 708
 709         nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 710
 711         rcu_read_lock();
 712         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 713
 714         if (likely(l3proto->nlattr_to_tuple)) {
 715                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 716                                           l3proto->nla_policy);
 717                 if (ret == 0)
 718                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 719         }
 720
 721         rcu_read_unlock();
 722
 723         return ret;
 724 }
 725
 726 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 727         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 728 };
 729
 730 static inline int
 731 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 732                             struct nf_conntrack_tuple *tuple)
 733 {
 734         struct nlattr *tb[CTA_PROTO_MAX+1];
 735         struct nf_conntrack_l4proto *l4proto;
 736         int ret = 0;
 737
 738         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 739         if (ret < 0)
 740                 return ret;
 741
 742         if (!tb[CTA_PROTO_NUM])
 743                 return -EINVAL;
 744         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 745
 746         rcu_read_lock();
 747         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 748
 749         if (likely(l4proto->nlattr_to_tuple)) {
 750                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 751                                           l4proto->nla_policy);
 752                 if (ret == 0)
 753                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 754         }
 755
 756         rcu_read_unlock();
 757
 758         return ret;
 759 }
 760
 761 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 762         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 763         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 764 };
 765
 766 static int
 767 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 768                       struct nf_conntrack_tuple *tuple,
 769                       enum ctattr_tuple type, u_int8_t l3num)
 770 {
 771         struct nlattr *tb[CTA_TUPLE_MAX+1];
 772         int err;
 773
 774         memset(tuple, 0, sizeof(*tuple));
 775
 776         nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 777
 778         if (!tb[CTA_TUPLE_IP])
 779                 return -EINVAL;
 780
 781         tuple->src.l3num = l3num;
 782
 783         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 784         if (err < 0)
 785                 return err;
 786
 787         if (!tb[CTA_TUPLE_PROTO])
 788                 return -EINVAL;
 789
 790         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 791         if (err < 0)
 792                 return err;
 793
 794         /* orig and expect tuples get DIR_ORIGINAL */
 795         if (type == CTA_TUPLE_REPLY)
 796                 tuple->dst.dir = IP_CT_DIR_REPLY;
 797         else
 798                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 799
 800         return 0;
 801 }
 802
 803 static int
 804 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 805 {
 806         if (attr)
 807 #ifdef CONFIG_NF_CONNTRACK_ZONES
 808                 *zone = ntohs(nla_get_be16(attr));
 809 #else
 810                 return -EOPNOTSUPP;
 811 #endif
 812         else
 813                 *zone = 0;
 814
 815         return 0;
 816 }
 817
 818 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 819         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING },
 820 };
 821
 822 static inline int
 823 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name)
 824 {
 825         struct nlattr *tb[CTA_HELP_MAX+1];
 826
 827         nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 828
 829         if (!tb[CTA_HELP_NAME])
 830                 return -EINVAL;
 831
 832         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 833
 834         return 0;
 835 }
 836
 837 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 838         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 839         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 840         [CTA_STATUS]            = { .type = NLA_U32 },
 841         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 842         [CTA_HELP]              = { .type = NLA_NESTED },
 843         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 844         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 845         [CTA_MARK]              = { .type = NLA_U32 },
 846         [CTA_ID]                = { .type = NLA_U32 },
 847         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 848         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 849         [CTA_ZONE]              = { .type = NLA_U16 },
 850 };
 851
 852 static int
 853 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 854                         const struct nlmsghdr *nlh,
 855                         const struct nlattr * const cda[])
 856 {
 857         struct net *net = sock_net(ctnl);
 858         struct nf_conntrack_tuple_hash *h;
 859         struct nf_conntrack_tuple tuple;
 860         struct nf_conn *ct;
 861         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 862         u_int8_t u3 = nfmsg->nfgen_family;
 863         u16 zone;
 864         int err;
 865
 866         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 867         if (err < 0)
 868                 return err;
 869
 870         if (cda[CTA_TUPLE_ORIG])
 871                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 872         else if (cda[CTA_TUPLE_REPLY])
 873                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 874         else {
 875                 /* Flush the whole table */
 876                 nf_conntrack_flush_report(net,
 877                                          NETLINK_CB(skb).pid,
 878                                          nlmsg_report(nlh));
 879                 return 0;
 880         }
 881
 882         if (err < 0)
 883                 return err;
 884
 885         h = nf_conntrack_find_get(net, zone, &tuple);
 886         if (!h)
 887                 return -ENOENT;
 888
 889         ct = nf_ct_tuplehash_to_ctrack(h);
 890
 891         if (cda[CTA_ID]) {
 892                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 893                 if (id != (u32)(unsigned long)ct) {
 894                         nf_ct_put(ct);
 895                         return -ENOENT;
 896                 }
 897         }
 898
 899         if (nf_conntrack_event_report(IPCT_DESTROY, ct,
 900                                       NETLINK_CB(skb).pid,
 901                                       nlmsg_report(nlh)) < 0) {
 902                 nf_ct_delete_from_lists(ct);
 903                 /* we failed to report the event, try later */
 904                 nf_ct_insert_dying_list(ct);
 905                 nf_ct_put(ct);
 906                 return 0;
 907         }
 908
 909         /* death_by_timeout would report the event again */
 910         set_bit(IPS_DYING_BIT, &ct->status);
 911
 912         nf_ct_kill(ct);
 913         nf_ct_put(ct);
 914
 915         return 0;
 916 }
 917
 918 static int
 919 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 920                         const struct nlmsghdr *nlh,
 921                         const struct nlattr * const cda[])
 922 {
 923         struct net *net = sock_net(ctnl);
 924         struct nf_conntrack_tuple_hash *h;
 925         struct nf_conntrack_tuple tuple;
 926         struct nf_conn *ct;
 927         struct sk_buff *skb2 = NULL;
 928         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
 929         u_int8_t u3 = nfmsg->nfgen_family;
 930         u16 zone;
 931         int err;
 932
 933         if (nlh->nlmsg_flags & NLM_F_DUMP)
 934                 return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 935                                           ctnetlink_done);
 936
 937         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
 938         if (err < 0)
 939                 return err;
 940
 941         if (cda[CTA_TUPLE_ORIG])
 942                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 943         else if (cda[CTA_TUPLE_REPLY])
 944                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 945         else
 946                 return -EINVAL;
 947
 948         if (err < 0)
 949                 return err;
 950
 951         h = nf_conntrack_find_get(net, zone, &tuple);
 952         if (!h)
 953                 return -ENOENT;
 954
 955         ct = nf_ct_tuplehash_to_ctrack(h);
 956
 957         err = -ENOMEM;
 958         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 959         if (skb2 == NULL) {
 960                 nf_ct_put(ct);
 961                 return -ENOMEM;
 962         }
 963
 964         rcu_read_lock();
 965         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 966                                   IPCTNL_MSG_CT_NEW, ct);
 967         rcu_read_unlock();
 968         nf_ct_put(ct);
 969         if (err <= 0)
 970                 goto free;
 971
 972         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 973         if (err < 0)
 974                 goto out;
 975
 976         return 0;
 977
 978 free:
 979         kfree_skb(skb2);
 980 out:
 981         /* this avoids a loop in nfnetlink. */
 982         return err == -EAGAIN ? -ENOBUFS : err;
 983 }
 984
 985 #ifdef CONFIG_NF_NAT_NEEDED
 986 static int
 987 ctnetlink_parse_nat_setup(struct nf_conn *ct,
 988                           enum nf_nat_manip_type manip,
 989                           const struct nlattr *attr)
 990 {
 991         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 992
 993         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 994         if (!parse_nat_setup) {
 995 #ifdef CONFIG_MODULES
 996                 rcu_read_unlock();
 997                 spin_unlock_bh(&nf_conntrack_lock);
 998                 nfnl_unlock();
 999                 if (request_module("nf-nat-ipv4") < 0) {
1000                         nfnl_lock();
1001                         spin_lock_bh(&nf_conntrack_lock);
1002                         rcu_read_lock();
1003                         return -EOPNOTSUPP;
1004                 }
1005                 nfnl_lock();
1006                 spin_lock_bh(&nf_conntrack_lock);
1007                 rcu_read_lock();
1008                 if (nfnetlink_parse_nat_setup_hook)
1009                         return -EAGAIN;
1010 #endif
1011                 return -EOPNOTSUPP;
1012         }
1013
1014         return parse_nat_setup(ct, manip, attr);
1015 }
1016 #endif
1017
1018 static int
1019 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1020 {
1021         unsigned long d;
1022         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1023         d = ct->status ^ status;
1024
1025         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1026                 /* unchangeable */
1027                 return -EBUSY;
1028
1029         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1030                 /* SEEN_REPLY bit can only be set */
1031                 return -EBUSY;
1032
1033         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1034                 /* ASSURED bit can only be set */
1035                 return -EBUSY;
1036
1037         /* Be careful here, modifying NAT bits can screw up things,
1038          * so don't let users modify them directly if they don't pass
1039          * nf_nat_range. */
1040         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1041         return 0;
1042 }
1043
1044 static int
1045 ctnetlink_change_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1046 {
1047 #ifdef CONFIG_NF_NAT_NEEDED
1048         int ret;
1049
1050         if (cda[CTA_NAT_DST]) {
1051                 ret = ctnetlink_parse_nat_setup(ct,
1052                                                 IP_NAT_MANIP_DST,
1053                                                 cda[CTA_NAT_DST]);
1054                 if (ret < 0)
1055                         return ret;
1056         }
1057         if (cda[CTA_NAT_SRC]) {
1058                 ret = ctnetlink_parse_nat_setup(ct,
1059                                                 IP_NAT_MANIP_SRC,
1060                                                 cda[CTA_NAT_SRC]);
1061                 if (ret < 0)
1062                         return ret;
1063         }
1064         return 0;
1065 #else
1066         return -EOPNOTSUPP;
1067 #endif
1068 }
1069
1070 static inline int
1071 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1072 {
1073         struct nf_conntrack_helper *helper;
1074         struct nf_conn_help *help = nfct_help(ct);
1075         char *helpname = NULL;
1076         int err;
1077
1078         /* don't change helper of sibling connections */
1079         if (ct->master)
1080                 return -EBUSY;
1081
1082         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1083         if (err < 0)
1084                 return err;
1085
1086         if (!strcmp(helpname, "")) {
1087                 if (help && help->helper) {
1088                         /* we had a helper before ... */
1089                         nf_ct_remove_expectations(ct);
1090                         rcu_assign_pointer(help->helper, NULL);
1091                 }
1092
1093                 return 0;
1094         }
1095
1096         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1097                                             nf_ct_protonum(ct));
1098         if (helper == NULL) {
1099 #ifdef CONFIG_MODULES
1100                 spin_unlock_bh(&nf_conntrack_lock);
1101
1102                 if (request_module("nfct-helper-%s", helpname) < 0) {
1103                         spin_lock_bh(&nf_conntrack_lock);
1104                         return -EOPNOTSUPP;
1105                 }
1106
1107                 spin_lock_bh(&nf_conntrack_lock);
1108                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1109                                                     nf_ct_protonum(ct));
1110                 if (helper)
1111                         return -EAGAIN;
1112 #endif
1113                 return -EOPNOTSUPP;
1114         }
1115
1116         if (help) {
1117                 if (help->helper == helper)
1118                         return 0;
1119                 if (help->helper)
1120                         return -EBUSY;
1121                 /* need to zero data of old helper */
1122                 memset(&help->help, 0, sizeof(help->help));
1123         } else {
1124                 /* we cannot set a helper for an existing conntrack */
1125                 return -EOPNOTSUPP;
1126         }
1127
1128         rcu_assign_pointer(help->helper, helper);
1129
1130         return 0;
1131 }
1132
1133 static inline int
1134 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1135 {
1136         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1137
1138         if (!del_timer(&ct->timeout))
1139                 return -ETIME;
1140
1141         ct->timeout.expires = jiffies + timeout * HZ;
1142         add_timer(&ct->timeout);
1143
1144         return 0;
1145 }
1146
1147 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1148         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1149         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1150         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1151 };
1152
1153 static inline int
1154 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1155 {
1156         const struct nlattr *attr = cda[CTA_PROTOINFO];
1157         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1158         struct nf_conntrack_l4proto *l4proto;
1159         int err = 0;
1160
1161         nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1162
1163         rcu_read_lock();
1164         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1165         if (l4proto->from_nlattr)
1166                 err = l4proto->from_nlattr(tb, ct);
1167         rcu_read_unlock();
1168
1169         return err;
1170 }
1171
1172 #ifdef CONFIG_NF_NAT_NEEDED
1173 static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
1174         [CTA_NAT_SEQ_CORRECTION_POS]    = { .type = NLA_U32 },
1175         [CTA_NAT_SEQ_OFFSET_BEFORE]     = { .type = NLA_U32 },
1176         [CTA_NAT_SEQ_OFFSET_AFTER]      = { .type = NLA_U32 },
1177 };
1178
1179 static inline int
1180 change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
1181 {
1182         struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
1183
1184         nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
1185
1186         if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
1187                 return -EINVAL;
1188
1189         natseq->correction_pos =
1190                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
1191
1192         if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
1193                 return -EINVAL;
1194
1195         natseq->offset_before =
1196                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
1197
1198         if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
1199                 return -EINVAL;
1200
1201         natseq->offset_after =
1202                 ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1203
1204         return 0;
1205 }
1206
1207 static int
1208 ctnetlink_change_nat_seq_adj(struct nf_conn *ct,
1209                              const struct nlattr * const cda[])
1210 {
1211         int ret = 0;
1212         struct nf_conn_nat *nat = nfct_nat(ct);
1213
1214         if (!nat)
1215                 return 0;
1216
1217         if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1218                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1219                                          cda[CTA_NAT_SEQ_ADJ_ORIG]);
1220                 if (ret < 0)
1221                         return ret;
1222
1223                 ct->status |= IPS_SEQ_ADJUST;
1224         }
1225
1226         if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1227                 ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1228                                          cda[CTA_NAT_SEQ_ADJ_REPLY]);
1229                 if (ret < 0)
1230                         return ret;
1231
1232                 ct->status |= IPS_SEQ_ADJUST;
1233         }
1234
1235         return 0;
1236 }
1237 #endif
1238
1239 static int
1240 ctnetlink_change_conntrack(struct nf_conn *ct,
1241                            const struct nlattr * const cda[])
1242 {
1243         int err;
1244
1245         /* only allow NAT changes and master assignation for new conntracks */
1246         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1247                 return -EOPNOTSUPP;
1248
1249         if (cda[CTA_HELP]) {
1250                 err = ctnetlink_change_helper(ct, cda);
1251                 if (err < 0)
1252                         return err;
1253         }
1254
1255         if (cda[CTA_TIMEOUT]) {
1256                 err = ctnetlink_change_timeout(ct, cda);
1257                 if (err < 0)
1258                         return err;
1259         }
1260
1261         if (cda[CTA_STATUS]) {
1262                 err = ctnetlink_change_status(ct, cda);
1263                 if (err < 0)
1264                         return err;
1265         }
1266
1267         if (cda[CTA_PROTOINFO]) {
1268                 err = ctnetlink_change_protoinfo(ct, cda);
1269                 if (err < 0)
1270                         return err;
1271         }
1272
1273 #if defined(CONFIG_NF_CONNTRACK_MARK)
1274         if (cda[CTA_MARK])
1275                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1276 #endif
1277
1278 #ifdef CONFIG_NF_NAT_NEEDED
1279         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1280                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1281                 if (err < 0)
1282                         return err;
1283         }
1284 #endif
1285
1286         return 0;
1287 }
1288
1289 static struct nf_conn *
1290 ctnetlink_create_conntrack(struct net *net, u16 zone,
1291                            const struct nlattr * const cda[],
1292                            struct nf_conntrack_tuple *otuple,
1293                            struct nf_conntrack_tuple *rtuple,
1294                            u8 u3)
1295 {
1296         struct nf_conn *ct;
1297         int err = -EINVAL;
1298         struct nf_conntrack_helper *helper;
1299
1300         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1301         if (IS_ERR(ct))
1302                 return ERR_PTR(-ENOMEM);
1303
1304         if (!cda[CTA_TIMEOUT])
1305                 goto err1;
1306         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1307
1308         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1309
1310         rcu_read_lock();
1311         if (cda[CTA_HELP]) {
1312                 char *helpname = NULL;
1313
1314                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
1315                 if (err < 0)
1316                         goto err2;
1317
1318                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1319                                                     nf_ct_protonum(ct));
1320                 if (helper == NULL) {
1321                         rcu_read_unlock();
1322 #ifdef CONFIG_MODULES
1323                         if (request_module("nfct-helper-%s", helpname) < 0) {
1324                                 err = -EOPNOTSUPP;
1325                                 goto err1;
1326                         }
1327
1328                         rcu_read_lock();
1329                         helper = __nf_conntrack_helper_find(helpname,
1330                                                             nf_ct_l3num(ct),
1331                                                             nf_ct_protonum(ct));
1332                         if (helper) {
1333                                 err = -EAGAIN;
1334                                 goto err2;
1335                         }
1336                         rcu_read_unlock();
1337 #endif
1338                         err = -EOPNOTSUPP;
1339                         goto err1;
1340                 } else {
1341                         struct nf_conn_help *help;
1342
1343                         help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1344                         if (help == NULL) {
1345                                 err = -ENOMEM;
1346                                 goto err2;
1347                         }
1348
1349                         /* not in hash table yet so not strictly necessary */
1350                         rcu_assign_pointer(help->helper, helper);
1351                 }
1352         } else {
1353                 /* try an implicit helper assignation */
1354                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1355                 if (err < 0)
1356                         goto err2;
1357         }
1358
1359         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1360                 err = ctnetlink_change_nat(ct, cda);
1361                 if (err < 0)
1362                         goto err2;
1363         }
1364
1365         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1366         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1367         /* we must add conntrack extensions before confirmation. */
1368         ct->status |= IPS_CONFIRMED;
1369
1370         if (cda[CTA_STATUS]) {
1371                 err = ctnetlink_change_status(ct, cda);
1372                 if (err < 0)
1373                         goto err2;
1374         }
1375
1376 #ifdef CONFIG_NF_NAT_NEEDED
1377         if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1378                 err = ctnetlink_change_nat_seq_adj(ct, cda);
1379                 if (err < 0)
1380                         goto err2;
1381         }
1382 #endif
1383
1384         if (cda[CTA_PROTOINFO]) {
1385                 err = ctnetlink_change_protoinfo(ct, cda);
1386                 if (err < 0)
1387                         goto err2;
1388         }
1389
1390 #if defined(CONFIG_NF_CONNTRACK_MARK)
1391         if (cda[CTA_MARK])
1392                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1393 #endif
1394
1395         /* setup master conntrack: this is a confirmed expectation */
1396         if (cda[CTA_TUPLE_MASTER]) {
1397                 struct nf_conntrack_tuple master;
1398                 struct nf_conntrack_tuple_hash *master_h;
1399                 struct nf_conn *master_ct;
1400
1401                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1402                 if (err < 0)
1403                         goto err2;
1404
1405                 master_h = nf_conntrack_find_get(net, zone, &master);
1406                 if (master_h == NULL) {
1407                         err = -ENOENT;
1408                         goto err2;
1409                 }
1410                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1411                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1412                 ct->master = master_ct;
1413         }
1414
1415         add_timer(&ct->timeout);
1416         nf_conntrack_hash_insert(ct);
1417         rcu_read_unlock();
1418
1419         return ct;
1420
1421 err2:
1422         rcu_read_unlock();
1423 err1:
1424         nf_conntrack_free(ct);
1425         return ERR_PTR(err);
1426 }
1427
1428 static int
1429 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1430                         const struct nlmsghdr *nlh,
1431                         const struct nlattr * const cda[])
1432 {
1433         struct net *net = sock_net(ctnl);
1434         struct nf_conntrack_tuple otuple, rtuple;
1435         struct nf_conntrack_tuple_hash *h = NULL;
1436         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1437         u_int8_t u3 = nfmsg->nfgen_family;
1438         u16 zone;
1439         int err;
1440
1441         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1442         if (err < 0)
1443                 return err;
1444
1445         if (cda[CTA_TUPLE_ORIG]) {
1446                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1447                 if (err < 0)
1448                         return err;
1449         }
1450
1451         if (cda[CTA_TUPLE_REPLY]) {
1452                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1453                 if (err < 0)
1454                         return err;
1455         }
1456
1457         spin_lock_bh(&nf_conntrack_lock);
1458         if (cda[CTA_TUPLE_ORIG])
1459                 h = __nf_conntrack_find(net, zone, &otuple);
1460         else if (cda[CTA_TUPLE_REPLY])
1461                 h = __nf_conntrack_find(net, zone, &rtuple);
1462
1463         if (h == NULL) {
1464                 err = -ENOENT;
1465                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1466                         struct nf_conn *ct;
1467                         enum ip_conntrack_events events;
1468
1469                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1470                                                         &rtuple, u3);
1471                         if (IS_ERR(ct)) {
1472                                 err = PTR_ERR(ct);
1473                                 goto out_unlock;
1474                         }
1475                         err = 0;
1476                         nf_conntrack_get(&ct->ct_general);
1477                         spin_unlock_bh(&nf_conntrack_lock);
1478                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1479                                 events = IPCT_RELATED;
1480                         else
1481                                 events = IPCT_NEW;
1482
1483                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1484                                                       (1 << IPCT_ASSURED) |
1485                                                       (1 << IPCT_HELPER) |
1486                                                       (1 << IPCT_PROTOINFO) |
1487                                                       (1 << IPCT_NATSEQADJ) |
1488                                                       (1 << IPCT_MARK) | events,
1489                                                       ct, NETLINK_CB(skb).pid,
1490                                                       nlmsg_report(nlh));
1491                         nf_ct_put(ct);
1492                 } else
1493                         spin_unlock_bh(&nf_conntrack_lock);
1494
1495                 return err;
1496         }
1497         /* implicit 'else' */
1498
1499         /* We manipulate the conntrack inside the global conntrack table lock,
1500          * so there's no need to increase the refcount */
1501         err = -EEXIST;
1502         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1503                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
1504
1505                 err = ctnetlink_change_conntrack(ct, cda);
1506                 if (err == 0) {
1507                         nf_conntrack_get(&ct->ct_general);
1508                         spin_unlock_bh(&nf_conntrack_lock);
1509                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1510                                                       (1 << IPCT_ASSURED) |
1511                                                       (1 << IPCT_HELPER) |
1512                                                       (1 << IPCT_PROTOINFO) |
1513                                                       (1 << IPCT_NATSEQADJ) |
1514                                                       (1 << IPCT_MARK),
1515                                                       ct, NETLINK_CB(skb).pid,
1516                                                       nlmsg_report(nlh));
1517                         nf_ct_put(ct);
1518                 } else
1519                         spin_unlock_bh(&nf_conntrack_lock);
1520
1521                 return err;
1522         }
1523
1524 out_unlock:
1525         spin_unlock_bh(&nf_conntrack_lock);
1526         return err;
1527 }
1528
1529 /***********************************************************************
1530  * EXPECT
1531  ***********************************************************************/
1532
1533 static inline int
1534 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1535                          const struct nf_conntrack_tuple *tuple,
1536                          enum ctattr_expect type)
1537 {
1538         struct nlattr *nest_parms;
1539
1540         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1541         if (!nest_parms)
1542                 goto nla_put_failure;
1543         if (ctnetlink_dump_tuples(skb, tuple) < 0)
1544                 goto nla_put_failure;
1545         nla_nest_end(skb, nest_parms);
1546
1547         return 0;
1548
1549 nla_put_failure:
1550         return -1;
1551 }
1552
1553 static inline int
1554 ctnetlink_exp_dump_mask(struct sk_buff *skb,
1555                         const struct nf_conntrack_tuple *tuple,
1556                         const struct nf_conntrack_tuple_mask *mask)
1557 {
1558         int ret;
1559         struct nf_conntrack_l3proto *l3proto;
1560         struct nf_conntrack_l4proto *l4proto;
1561         struct nf_conntrack_tuple m;
1562         struct nlattr *nest_parms;
1563
1564         memset(&m, 0xFF, sizeof(m));
1565         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1566         m.src.u.all = mask->src.u.all;
1567         m.dst.protonum = tuple->dst.protonum;
1568
1569         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1570         if (!nest_parms)
1571                 goto nla_put_failure;
1572
1573         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
1574         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1575
1576         if (unlikely(ret < 0))
1577                 goto nla_put_failure;
1578
1579         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
1580         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1581         if (unlikely(ret < 0))
1582                 goto nla_put_failure;
1583
1584         nla_nest_end(skb, nest_parms);
1585
1586         return 0;
1587
1588 nla_put_failure:
1589         return -1;
1590 }
1591
1592 static int
1593 ctnetlink_exp_dump_expect(struct sk_buff *skb,
1594                           const struct nf_conntrack_expect *exp)
1595 {
1596         struct nf_conn *master = exp->master;
1597         long timeout = (exp->timeout.expires - jiffies) / HZ;
1598         struct nf_conn_help *help;
1599
1600         if (timeout < 0)
1601                 timeout = 0;
1602
1603         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1604                 goto nla_put_failure;
1605         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1606                 goto nla_put_failure;
1607         if (ctnetlink_exp_dump_tuple(skb,
1608                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1609                                  CTA_EXPECT_MASTER) < 0)
1610                 goto nla_put_failure;
1611
1612         NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1613         NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1614         NLA_PUT_BE32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags));
1615         help = nfct_help(master);
1616         if (help) {
1617                 struct nf_conntrack_helper *helper;
1618
1619                 helper = rcu_dereference(help->helper);
1620                 if (helper)
1621                         NLA_PUT_STRING(skb, CTA_EXPECT_HELP_NAME, helper->name);
1622         }
1623
1624         return 0;
1625
1626 nla_put_failure:
1627         return -1;
1628 }
1629
1630 static int
1631 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1632                         int event, const struct nf_conntrack_expect *exp)
1633 {
1634         struct nlmsghdr *nlh;
1635         struct nfgenmsg *nfmsg;
1636         unsigned int flags = pid ? NLM_F_MULTI : 0;
1637
1638         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1639         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*nfmsg), flags);
1640         if (nlh == NULL)
1641                 goto nlmsg_failure;
1642
1643         nfmsg = nlmsg_data(nlh);
1644         nfmsg->nfgen_family = exp->tuple.src.l3num;
1645         nfmsg->version      = NFNETLINK_V0;
1646         nfmsg->res_id       = 0;
1647
1648         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1649                 goto nla_put_failure;
1650
1651         nlmsg_end(skb, nlh);
1652         return skb->len;
1653
1654 nlmsg_failure:
1655 nla_put_failure:
1656         nlmsg_cancel(skb, nlh);
1657         return -1;
1658 }
1659
1660 #ifdef CONFIG_NF_CONNTRACK_EVENTS
1661 static int
1662 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
1663 {
1664         struct nf_conntrack_expect *exp = item->exp;
1665         struct net *net = nf_ct_exp_net(exp);
1666         struct nlmsghdr *nlh;
1667         struct nfgenmsg *nfmsg;
1668         struct sk_buff *skb;
1669         unsigned int type, group;
1670         int flags = 0;
1671
1672         if (events & (1 << IPEXP_DESTROY)) {
1673                 type = IPCTNL_MSG_EXP_DELETE;
1674                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
1675         } else if (events & (1 << IPEXP_NEW)) {
1676                 type = IPCTNL_MSG_EXP_NEW;
1677                 flags = NLM_F_CREATE|NLM_F_EXCL;
1678                 group = NFNLGRP_CONNTRACK_EXP_NEW;
1679         } else
1680                 return 0;
1681
1682         if (!item->report && !nfnetlink_has_listeners(net, group))
1683                 return 0;
1684
1685         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1686         if (skb == NULL)
1687                 goto errout;
1688
1689         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1690         nlh = nlmsg_put(skb, item->pid, 0, type, sizeof(*nfmsg), flags);
1691         if (nlh == NULL)
1692                 goto nlmsg_failure;
1693
1694         nfmsg = nlmsg_data(nlh);
1695         nfmsg->nfgen_family = exp->tuple.src.l3num;
1696         nfmsg->version      = NFNETLINK_V0;
1697         nfmsg->res_id       = 0;
1698
1699         rcu_read_lock();
1700         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1701                 goto nla_put_failure;
1702         rcu_read_unlock();
1703
1704         nlmsg_end(skb, nlh);
1705         nfnetlink_send(skb, net, item->pid, group, item->report, GFP_ATOMIC);
1706         return 0;
1707
1708 nla_put_failure:
1709         rcu_read_unlock();
1710         nlmsg_cancel(skb, nlh);
1711 nlmsg_failure:
1712         kfree_skb(skb);
1713 errout:
1714         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
1715         return 0;
1716 }
1717 #endif
1718 static int ctnetlink_exp_done(struct netlink_callback *cb)
1719 {
1720         if (cb->args[1])
1721                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1722         return 0;
1723 }
1724
1725 static int
1726 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1727 {
1728         struct net *net = sock_net(skb->sk);
1729         struct nf_conntrack_expect *exp, *last;
1730         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1731         struct hlist_node *n;
1732         u_int8_t l3proto = nfmsg->nfgen_family;
1733
1734         rcu_read_lock();
1735         last = (struct nf_conntrack_expect *)cb->args[1];
1736         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1737 restart:
1738                 hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1739                                      hnode) {
1740                         if (l3proto && exp->tuple.src.l3num != l3proto)
1741                                 continue;
1742                         if (cb->args[1]) {
1743                                 if (exp != last)
1744                                         continue;
1745                                 cb->args[1] = 0;
1746                         }
1747                         if (ctnetlink_exp_fill_info(skb,
1748                                                     NETLINK_CB(cb->skb).pid,
1749                                                     cb->nlh->nlmsg_seq,
1750                                                     IPCTNL_MSG_EXP_NEW,
1751                                                     exp) < 0) {
1752                                 if (!atomic_inc_not_zero(&exp->use))
1753                                         continue;
1754                                 cb->args[1] = (unsigned long)exp;
1755                                 goto out;
1756                         }
1757                 }
1758                 if (cb->args[1]) {
1759                         cb->args[1] = 0;
1760                         goto restart;
1761                 }
1762         }
1763 out:
1764         rcu_read_unlock();
1765         if (last)
1766                 nf_ct_expect_put(last);
1767
1768         return skb->len;
1769 }
1770
1771 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1772         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1773         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1774         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1775         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1776         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1777         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING },
1778         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1779         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1780 };
1781
1782 static int
1783 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1784                      const struct nlmsghdr *nlh,
1785                      const struct nlattr * const cda[])
1786 {
1787         struct net *net = sock_net(ctnl);
1788         struct nf_conntrack_tuple tuple;
1789         struct nf_conntrack_expect *exp;
1790         struct sk_buff *skb2;
1791         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1792         u_int8_t u3 = nfmsg->nfgen_family;
1793         u16 zone;
1794         int err;
1795
1796         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1797                 return netlink_dump_start(ctnl, skb, nlh,
1798                                           ctnetlink_exp_dump_table,
1799                                           ctnetlink_exp_done);
1800         }
1801
1802         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1803         if (err < 0)
1804                 return err;
1805
1806         if (cda[CTA_EXPECT_MASTER])
1807                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1808         else
1809                 return -EINVAL;
1810
1811         if (err < 0)
1812                 return err;
1813
1814         exp = nf_ct_expect_find_get(net, zone, &tuple);
1815         if (!exp)
1816                 return -ENOENT;
1817
1818         if (cda[CTA_EXPECT_ID]) {
1819                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1820                 if (ntohl(id) != (u32)(unsigned long)exp) {
1821                         nf_ct_expect_put(exp);
1822                         return -ENOENT;
1823                 }
1824         }
1825
1826         err = -ENOMEM;
1827         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1828         if (skb2 == NULL)
1829                 goto out;
1830
1831         rcu_read_lock();
1832         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1833                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
1834         rcu_read_unlock();
1835         if (err <= 0)
1836                 goto free;
1837
1838         nf_ct_expect_put(exp);
1839
1840         return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1841
1842 free:
1843         kfree_skb(skb2);
1844 out:
1845         nf_ct_expect_put(exp);
1846         return err;
1847 }
1848
1849 static int
1850 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1851                      const struct nlmsghdr *nlh,
1852                      const struct nlattr * const cda[])
1853 {
1854         struct net *net = sock_net(ctnl);
1855         struct nf_conntrack_expect *exp;
1856         struct nf_conntrack_tuple tuple;
1857         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1858         struct hlist_node *n, *next;
1859         u_int8_t u3 = nfmsg->nfgen_family;
1860         unsigned int i;
1861         u16 zone;
1862         int err;
1863
1864         if (cda[CTA_EXPECT_TUPLE]) {
1865                 /* delete a single expect by tuple */
1866                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
1867                 if (err < 0)
1868                         return err;
1869
1870                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1871                 if (err < 0)
1872                         return err;
1873
1874                 /* bump usage count to 2 */
1875                 exp = nf_ct_expect_find_get(net, zone, &tuple);
1876                 if (!exp)
1877                         return -ENOENT;
1878
1879                 if (cda[CTA_EXPECT_ID]) {
1880                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1881                         if (ntohl(id) != (u32)(unsigned long)exp) {
1882                                 nf_ct_expect_put(exp);
1883                                 return -ENOENT;
1884                         }
1885                 }
1886
1887                 /* after list removal, usage count == 1 */
1888                 spin_lock_bh(&nf_conntrack_lock);
1889                 if (del_timer(&exp->timeout)) {
1890                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).pid,
1891                                                    nlmsg_report(nlh));
1892                         nf_ct_expect_put(exp);
1893                 }
1894                 spin_unlock_bh(&nf_conntrack_lock);
1895                 /* have to put what we 'get' above.
1896                  * after this line usage count == 0 */
1897                 nf_ct_expect_put(exp);
1898         } else if (cda[CTA_EXPECT_HELP_NAME]) {
1899                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1900                 struct nf_conn_help *m_help;
1901
1902                 /* delete all expectations for this helper */
1903                 spin_lock_bh(&nf_conntrack_lock);
1904                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1905                         hlist_for_each_entry_safe(exp, n, next,
1906                                                   &net->ct.expect_hash[i],
1907                                                   hnode) {
1908                                 m_help = nfct_help(exp->master);
1909                                 if (!strcmp(m_help->helper->name, name) &&
1910                                     del_timer(&exp->timeout)) {
1911                                         nf_ct_unlink_expect_report(exp,
1912                                                         NETLINK_CB(skb).pid,
1913                                                         nlmsg_report(nlh));
1914                                         nf_ct_expect_put(exp);
1915                                 }
1916                         }
1917                 }
1918                 spin_unlock_bh(&nf_conntrack_lock);
1919         } else {
1920                 /* This basically means we have to flush everything*/
1921                 spin_lock_bh(&nf_conntrack_lock);
1922                 for (i = 0; i < nf_ct_expect_hsize; i++) {
1923                         hlist_for_each_entry_safe(exp, n, next,
1924                                                   &net->ct.expect_hash[i],
1925                                                   hnode) {
1926                                 if (del_timer(&exp->timeout)) {
1927                                         nf_ct_unlink_expect_report(exp,
1928                                                         NETLINK_CB(skb).pid,
1929                                                         nlmsg_report(nlh));
1930                                         nf_ct_expect_put(exp);
1931                                 }
1932                         }
1933                 }
1934                 spin_unlock_bh(&nf_conntrack_lock);
1935         }
1936
1937         return 0;
1938 }
1939 static int
1940 ctnetlink_change_expect(struct nf_conntrack_expect *x,
1941                         const struct nlattr * const cda[])
1942 {
1943         return -EOPNOTSUPP;
1944 }
1945
1946 static int
1947 ctnetlink_create_expect(struct net *net, u16 zone,
1948                         const struct nlattr * const cda[],
1949                         u_int8_t u3,
1950                         u32 pid, int report)
1951 {
1952         struct nf_conntrack_tuple tuple, mask, master_tuple;
1953         struct nf_conntrack_tuple_hash *h = NULL;
1954         struct nf_conntrack_expect *exp;
1955         struct nf_conn *ct;
1956         struct nf_conn_help *help;
1957         int err = 0;
1958
1959         /* caller guarantees that those three CTA_EXPECT_* exist */
1960         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1961         if (err < 0)
1962                 return err;
1963         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1964         if (err < 0)
1965                 return err;
1966         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1967         if (err < 0)
1968                 return err;
1969
1970         /* Look for master conntrack of this expectation */
1971         h = nf_conntrack_find_get(net, zone, &master_tuple);
1972         if (!h)
1973                 return -ENOENT;
1974         ct = nf_ct_tuplehash_to_ctrack(h);
1975         exp = nf_ct_expect_alloc(ct);
1976         if (!exp) {
1977                 err = -ENOMEM;
1978                 goto out;
1979         }
1980         help = nfct_help(ct);
1981         if (!help) {
1982                 if (!cda[CTA_EXPECT_TIMEOUT]) {
1983                         err = -EINVAL;
1984                         goto out;
1985                 }
1986                 exp->timeout.expires =
1987                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
1988
1989                 exp->flags = NF_CT_EXPECT_USERSPACE;
1990                 if (cda[CTA_EXPECT_FLAGS]) {
1991                         exp->flags |=
1992                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1993                 }
1994         } else {
1995                 if (cda[CTA_EXPECT_FLAGS]) {
1996                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
1997                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
1998                 } else
1999                         exp->flags = 0;
2000         }
2001
2002         exp->class = 0;
2003         exp->expectfn = NULL;
2004         exp->master = ct;
2005         exp->helper = NULL;
2006         memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
2007         memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
2008         exp->mask.src.u.all = mask.src.u.all;
2009
2010         err = nf_ct_expect_related_report(exp, pid, report);
2011         nf_ct_expect_put(exp);
2012
2013 out:
2014         nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
2015         return err;
2016 }
2017
2018 static int
2019 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2020                      const struct nlmsghdr *nlh,
2021                      const struct nlattr * const cda[])
2022 {
2023         struct net *net = sock_net(ctnl);
2024         struct nf_conntrack_tuple tuple;
2025         struct nf_conntrack_expect *exp;
2026         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2027         u_int8_t u3 = nfmsg->nfgen_family;
2028         u16 zone;
2029         int err;
2030
2031         if (!cda[CTA_EXPECT_TUPLE]
2032             || !cda[CTA_EXPECT_MASK]
2033             || !cda[CTA_EXPECT_MASTER])
2034                 return -EINVAL;
2035
2036         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2037         if (err < 0)
2038                 return err;
2039
2040         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2041         if (err < 0)
2042                 return err;
2043
2044         spin_lock_bh(&nf_conntrack_lock);
2045         exp = __nf_ct_expect_find(net, zone, &tuple);
2046
2047         if (!exp) {
2048                 spin_unlock_bh(&nf_conntrack_lock);
2049                 err = -ENOENT;
2050                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2051                         err = ctnetlink_create_expect(net, zone, cda,
2052                                                       u3,
2053                                                       NETLINK_CB(skb).pid,
2054                                                       nlmsg_report(nlh));
2055                 }
2056                 return err;
2057         }
2058
2059         err = -EEXIST;
2060         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2061                 err = ctnetlink_change_expect(exp, cda);
2062         spin_unlock_bh(&nf_conntrack_lock);
2063
2064         return err;
2065 }
2066
2067 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2068 static struct nf_ct_event_notifier ctnl_notifier = {
2069         .fcn = ctnetlink_conntrack_event,
2070 };
2071
2072 static struct nf_exp_event_notifier ctnl_notifier_exp = {
2073         .fcn = ctnetlink_expect_event,
2074 };
2075 #endif
2076
2077 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
2078         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
2079                                             .attr_count = CTA_MAX,
2080                                             .policy = ct_nla_policy },
2081         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
2082                                             .attr_count = CTA_MAX,
2083                                             .policy = ct_nla_policy },
2084         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
2085                                             .attr_count = CTA_MAX,
2086                                             .policy = ct_nla_policy },
2087         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
2088                                             .attr_count = CTA_MAX,
2089                                             .policy = ct_nla_policy },
2090 };
2091
2092 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
2093         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
2094                                             .attr_count = CTA_EXPECT_MAX,
2095                                             .policy = exp_nla_policy },
2096         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
2097                                             .attr_count = CTA_EXPECT_MAX,
2098                                             .policy = exp_nla_policy },
2099         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
2100                                             .attr_count = CTA_EXPECT_MAX,
2101                                             .policy = exp_nla_policy },
2102 };
2103
2104 static const struct nfnetlink_subsystem ctnl_subsys = {
2105         .name                           = "conntrack",
2106         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
2107         .cb_count                       = IPCTNL_MSG_MAX,
2108         .cb                             = ctnl_cb,
2109 };
2110
2111 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
2112         .name                           = "conntrack_expect",
2113         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
2114         .cb_count                       = IPCTNL_MSG_EXP_MAX,
2115         .cb                             = ctnl_exp_cb,
2116 };
2117
2118 MODULE_ALIAS("ip_conntrack_netlink");
2119 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
2120 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
2121
2122 static int __init ctnetlink_init(void)
2123 {
2124         int ret;
2125
2126         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
2127         ret = nfnetlink_subsys_register(&ctnl_subsys);
2128         if (ret < 0) {
2129                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
2130                 goto err_out;
2131         }
2132
2133         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
2134         if (ret < 0) {
2135                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
2136                 goto err_unreg_subsys;
2137         }
2138
2139 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2140         ret = nf_conntrack_register_notifier(&ctnl_notifier);
2141         if (ret < 0) {
2142                 pr_err("ctnetlink_init: cannot register notifier.\n");
2143                 goto err_unreg_exp_subsys;
2144         }
2145
2146         ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
2147         if (ret < 0) {
2148                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
2149                 goto err_unreg_notifier;
2150         }
2151 #endif
2152
2153         return 0;
2154
2155 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2156 err_unreg_notifier:
2157         nf_conntrack_unregister_notifier(&ctnl_notifier);
2158 err_unreg_exp_subsys:
2159         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2160 #endif
2161 err_unreg_subsys:
2162         nfnetlink_subsys_unregister(&ctnl_subsys);
2163 err_out:
2164         return ret;
2165 }
2166
2167 static void __exit ctnetlink_exit(void)
2168 {
2169         pr_info("ctnetlink: unregistering from nfnetlink.\n");
2170
2171         nf_ct_remove_userspace_expectations();
2172 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2173         nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
2174         nf_conntrack_unregister_notifier(&ctnl_notifier);
2175 #endif
2176
2177         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
2178         nfnetlink_subsys_unregister(&ctnl_subsys);
2179 }
2180
2181 module_init(ctnetlink_init);
2182 module_exit(ctnetlink_exit);