Pileus Git - ~andy/linux/blob - net/netfilter/nf_conntrack_netlink.c

   1 /* Connection tracking via netlink socket. Allows for user space
   2  * protocol helpers and general trouble making from userspace.
   3  *
   4  * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5  * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6  * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7  * (C) 2005-2012 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_seqadj.h>
  41 #include <net/netfilter/nf_conntrack_l3proto.h>
  42 #include <net/netfilter/nf_conntrack_l4proto.h>
  43 #include <net/netfilter/nf_conntrack_tuple.h>
  44 #include <net/netfilter/nf_conntrack_acct.h>
  45 #include <net/netfilter/nf_conntrack_zones.h>
  46 #include <net/netfilter/nf_conntrack_timestamp.h>
  47 #include <net/netfilter/nf_conntrack_labels.h>
  48 #ifdef CONFIG_NF_NAT_NEEDED
  49 #include <net/netfilter/nf_nat_core.h>
  50 #include <net/netfilter/nf_nat_l4proto.h>
  51 #include <net/netfilter/nf_nat_helper.h>
  52 #endif
  53
  54 #include <linux/netfilter/nfnetlink.h>
  55 #include <linux/netfilter/nfnetlink_conntrack.h>
  56
  57 MODULE_LICENSE("GPL");
  58
  59 static char __initdata version[] = "0.93";
  60
  61 static inline int
  62 ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  63                             const struct nf_conntrack_tuple *tuple,
  64                             struct nf_conntrack_l4proto *l4proto)
  65 {
  66         int ret = 0;
  67         struct nlattr *nest_parms;
  68
  69         nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  70         if (!nest_parms)
  71                 goto nla_put_failure;
  72         if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
  73                 goto nla_put_failure;
  74
  75         if (likely(l4proto->tuple_to_nlattr))
  76                 ret = l4proto->tuple_to_nlattr(skb, tuple);
  77
  78         nla_nest_end(skb, nest_parms);
  79
  80         return ret;
  81
  82 nla_put_failure:
  83         return -1;
  84 }
  85
  86 static inline int
  87 ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  88                          const struct nf_conntrack_tuple *tuple,
  89                          struct nf_conntrack_l3proto *l3proto)
  90 {
  91         int ret = 0;
  92         struct nlattr *nest_parms;
  93
  94         nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  95         if (!nest_parms)
  96                 goto nla_put_failure;
  97
  98         if (likely(l3proto->tuple_to_nlattr))
  99                 ret = l3proto->tuple_to_nlattr(skb, tuple);
 100
 101         nla_nest_end(skb, nest_parms);
 102
 103         return ret;
 104
 105 nla_put_failure:
 106         return -1;
 107 }
 108
 109 static int
 110 ctnetlink_dump_tuples(struct sk_buff *skb,
 111                       const struct nf_conntrack_tuple *tuple)
 112 {
 113         int ret;
 114         struct nf_conntrack_l3proto *l3proto;
 115         struct nf_conntrack_l4proto *l4proto;
 116
 117         rcu_read_lock();
 118         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 119         ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 120
 121         if (ret >= 0) {
 122                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
 123                                                tuple->dst.protonum);
 124                 ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 125         }
 126         rcu_read_unlock();
 127         return ret;
 128 }
 129
 130 static inline int
 131 ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 132 {
 133         if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
 134                 goto nla_put_failure;
 135         return 0;
 136
 137 nla_put_failure:
 138         return -1;
 139 }
 140
 141 static inline int
 142 ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 143 {
 144         long timeout = ((long)ct->timeout.expires - (long)jiffies) / HZ;
 145
 146         if (timeout < 0)
 147                 timeout = 0;
 148
 149         if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
 150                 goto nla_put_failure;
 151         return 0;
 152
 153 nla_put_failure:
 154         return -1;
 155 }
 156
 157 static inline int
 158 ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
 159 {
 160         struct nf_conntrack_l4proto *l4proto;
 161         struct nlattr *nest_proto;
 162         int ret;
 163
 164         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 165         if (!l4proto->to_nlattr)
 166                 return 0;
 167
 168         nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 169         if (!nest_proto)
 170                 goto nla_put_failure;
 171
 172         ret = l4proto->to_nlattr(skb, nest_proto, ct);
 173
 174         nla_nest_end(skb, nest_proto);
 175
 176         return ret;
 177
 178 nla_put_failure:
 179         return -1;
 180 }
 181
 182 static inline int
 183 ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 184 {
 185         struct nlattr *nest_helper;
 186         const struct nf_conn_help *help = nfct_help(ct);
 187         struct nf_conntrack_helper *helper;
 188
 189         if (!help)
 190                 return 0;
 191
 192         helper = rcu_dereference(help->helper);
 193         if (!helper)
 194                 goto out;
 195
 196         nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 197         if (!nest_helper)
 198                 goto nla_put_failure;
 199         if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
 200                 goto nla_put_failure;
 201
 202         if (helper->to_nlattr)
 203                 helper->to_nlattr(skb, ct);
 204
 205         nla_nest_end(skb, nest_helper);
 206 out:
 207         return 0;
 208
 209 nla_put_failure:
 210         return -1;
 211 }
 212
 213 static int
 214 dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
 215               enum ip_conntrack_dir dir, int type)
 216 {
 217         enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 218         struct nf_conn_counter *counter = acct->counter;
 219         struct nlattr *nest_count;
 220         u64 pkts, bytes;
 221
 222         if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
 223                 pkts = atomic64_xchg(&counter[dir].packets, 0);
 224                 bytes = atomic64_xchg(&counter[dir].bytes, 0);
 225         } else {
 226                 pkts = atomic64_read(&counter[dir].packets);
 227                 bytes = atomic64_read(&counter[dir].bytes);
 228         }
 229
 230         nest_count = nla_nest_start(skb, attr | NLA_F_NESTED);
 231         if (!nest_count)
 232                 goto nla_put_failure;
 233
 234         if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts)) ||
 235             nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes)))
 236                 goto nla_put_failure;
 237
 238         nla_nest_end(skb, nest_count);
 239
 240         return 0;
 241
 242 nla_put_failure:
 243         return -1;
 244 }
 245
 246 static int
 247 ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
 248 {
 249         struct nf_conn_acct *acct = nf_conn_acct_find(ct);
 250
 251         if (!acct)
 252                 return 0;
 253
 254         if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
 255                 return -1;
 256         if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
 257                 return -1;
 258
 259         return 0;
 260 }
 261
 262 static int
 263 ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
 264 {
 265         struct nlattr *nest_count;
 266         const struct nf_conn_tstamp *tstamp;
 267
 268         tstamp = nf_conn_tstamp_find(ct);
 269         if (!tstamp)
 270                 return 0;
 271
 272         nest_count = nla_nest_start(skb, CTA_TIMESTAMP | NLA_F_NESTED);
 273         if (!nest_count)
 274                 goto nla_put_failure;
 275
 276         if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start)) ||
 277             (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
 278                                                cpu_to_be64(tstamp->stop))))
 279                 goto nla_put_failure;
 280         nla_nest_end(skb, nest_count);
 281
 282         return 0;
 283
 284 nla_put_failure:
 285         return -1;
 286 }
 287
 288 #ifdef CONFIG_NF_CONNTRACK_MARK
 289 static inline int
 290 ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 291 {
 292         if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
 293                 goto nla_put_failure;
 294         return 0;
 295
 296 nla_put_failure:
 297         return -1;
 298 }
 299 #else
 300 #define ctnetlink_dump_mark(a, b) (0)
 301 #endif
 302
 303 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 304 static inline int
 305 ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
 306 {
 307         struct nlattr *nest_secctx;
 308         int len, ret;
 309         char *secctx;
 310
 311         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
 312         if (ret)
 313                 return 0;
 314
 315         ret = -1;
 316         nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
 317         if (!nest_secctx)
 318                 goto nla_put_failure;
 319
 320         if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
 321                 goto nla_put_failure;
 322         nla_nest_end(skb, nest_secctx);
 323
 324         ret = 0;
 325 nla_put_failure:
 326         security_release_secctx(secctx, len);
 327         return ret;
 328 }
 329 #else
 330 #define ctnetlink_dump_secctx(a, b) (0)
 331 #endif
 332
 333 #ifdef CONFIG_NF_CONNTRACK_LABELS
 334 static int ctnetlink_label_size(const struct nf_conn *ct)
 335 {
 336         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 337
 338         if (!labels)
 339                 return 0;
 340         return nla_total_size(labels->words * sizeof(long));
 341 }
 342
 343 static int
 344 ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
 345 {
 346         struct nf_conn_labels *labels = nf_ct_labels_find(ct);
 347         unsigned int len, i;
 348
 349         if (!labels)
 350                 return 0;
 351
 352         len = labels->words * sizeof(long);
 353         i = 0;
 354         do {
 355                 if (labels->bits[i] != 0)
 356                         return nla_put(skb, CTA_LABELS, len, labels->bits);
 357                 i++;
 358         } while (i < labels->words);
 359
 360         return 0;
 361 }
 362 #else
 363 #define ctnetlink_dump_labels(a, b) (0)
 364 #define ctnetlink_label_size(a) (0)
 365 #endif
 366
 367 #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 368
 369 static inline int
 370 ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 371 {
 372         struct nlattr *nest_parms;
 373
 374         if (!(ct->status & IPS_EXPECTED))
 375                 return 0;
 376
 377         nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 378         if (!nest_parms)
 379                 goto nla_put_failure;
 380         if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 381                 goto nla_put_failure;
 382         nla_nest_end(skb, nest_parms);
 383
 384         return 0;
 385
 386 nla_put_failure:
 387         return -1;
 388 }
 389
 390 static int
 391 dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
 392 {
 393         struct nlattr *nest_parms;
 394
 395         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 396         if (!nest_parms)
 397                 goto nla_put_failure;
 398
 399         if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
 400                          htonl(seq->correction_pos)) ||
 401             nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
 402                          htonl(seq->offset_before)) ||
 403             nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
 404                          htonl(seq->offset_after)))
 405                 goto nla_put_failure;
 406
 407         nla_nest_end(skb, nest_parms);
 408
 409         return 0;
 410
 411 nla_put_failure:
 412         return -1;
 413 }
 414
 415 static inline int
 416 ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 417 {
 418         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
 419         struct nf_ct_seqadj *seq;
 420
 421         if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
 422                 return 0;
 423
 424         seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
 425         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
 426                 return -1;
 427
 428         seq = &seqadj->seq[IP_CT_DIR_REPLY];
 429         if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
 430                 return -1;
 431
 432         return 0;
 433 }
 434
 435 static inline int
 436 ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 437 {
 438         if (nla_put_be32(skb, CTA_ID, htonl((unsigned long)ct)))
 439                 goto nla_put_failure;
 440         return 0;
 441
 442 nla_put_failure:
 443         return -1;
 444 }
 445
 446 static inline int
 447 ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 448 {
 449         if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
 450                 goto nla_put_failure;
 451         return 0;
 452
 453 nla_put_failure:
 454         return -1;
 455 }
 456
 457 static int
 458 ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
 459                     struct nf_conn *ct)
 460 {
 461         struct nlmsghdr *nlh;
 462         struct nfgenmsg *nfmsg;
 463         struct nlattr *nest_parms;
 464         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
 465
 466         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW);
 467         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
 468         if (nlh == NULL)
 469                 goto nlmsg_failure;
 470
 471         nfmsg = nlmsg_data(nlh);
 472         nfmsg->nfgen_family = nf_ct_l3num(ct);
 473         nfmsg->version      = NFNETLINK_V0;
 474         nfmsg->res_id       = 0;
 475
 476         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 477         if (!nest_parms)
 478                 goto nla_put_failure;
 479         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 480                 goto nla_put_failure;
 481         nla_nest_end(skb, nest_parms);
 482
 483         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 484         if (!nest_parms)
 485                 goto nla_put_failure;
 486         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 487                 goto nla_put_failure;
 488         nla_nest_end(skb, nest_parms);
 489
 490         if (nf_ct_zone(ct) &&
 491             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 492                 goto nla_put_failure;
 493
 494         if (ctnetlink_dump_status(skb, ct) < 0 ||
 495             ctnetlink_dump_timeout(skb, ct) < 0 ||
 496             ctnetlink_dump_acct(skb, ct, type) < 0 ||
 497             ctnetlink_dump_timestamp(skb, ct) < 0 ||
 498             ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 499             ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 500             ctnetlink_dump_mark(skb, ct) < 0 ||
 501             ctnetlink_dump_secctx(skb, ct) < 0 ||
 502             ctnetlink_dump_labels(skb, ct) < 0 ||
 503             ctnetlink_dump_id(skb, ct) < 0 ||
 504             ctnetlink_dump_use(skb, ct) < 0 ||
 505             ctnetlink_dump_master(skb, ct) < 0 ||
 506             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 507                 goto nla_put_failure;
 508
 509         nlmsg_end(skb, nlh);
 510         return skb->len;
 511
 512 nlmsg_failure:
 513 nla_put_failure:
 514         nlmsg_cancel(skb, nlh);
 515         return -1;
 516 }
 517
 518 static inline size_t
 519 ctnetlink_proto_size(const struct nf_conn *ct)
 520 {
 521         struct nf_conntrack_l3proto *l3proto;
 522         struct nf_conntrack_l4proto *l4proto;
 523         size_t len = 0;
 524
 525         rcu_read_lock();
 526         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
 527         len += l3proto->nla_size;
 528
 529         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
 530         len += l4proto->nla_size;
 531         rcu_read_unlock();
 532
 533         return len;
 534 }
 535
 536 static inline size_t
 537 ctnetlink_acct_size(const struct nf_conn *ct)
 538 {
 539         if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
 540                 return 0;
 541         return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
 542                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
 543                + 2 * nla_total_size(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
 544                ;
 545 }
 546
 547 static inline int
 548 ctnetlink_secctx_size(const struct nf_conn *ct)
 549 {
 550 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 551         int len, ret;
 552
 553         ret = security_secid_to_secctx(ct->secmark, NULL, &len);
 554         if (ret)
 555                 return 0;
 556
 557         return nla_total_size(0) /* CTA_SECCTX */
 558                + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
 559 #else
 560         return 0;
 561 #endif
 562 }
 563
 564 static inline size_t
 565 ctnetlink_timestamp_size(const struct nf_conn *ct)
 566 {
 567 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
 568         if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
 569                 return 0;
 570         return nla_total_size(0) + 2 * nla_total_size(sizeof(uint64_t));
 571 #else
 572         return 0;
 573 #endif
 574 }
 575
 576 static inline size_t
 577 ctnetlink_nlmsg_size(const struct nf_conn *ct)
 578 {
 579         return NLMSG_ALIGN(sizeof(struct nfgenmsg))
 580                + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
 581                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
 582                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
 583                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
 584                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
 585                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
 586                + ctnetlink_acct_size(ct)
 587                + ctnetlink_timestamp_size(ct)
 588                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
 589                + nla_total_size(0) /* CTA_PROTOINFO */
 590                + nla_total_size(0) /* CTA_HELP */
 591                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
 592                + ctnetlink_secctx_size(ct)
 593 #ifdef CONFIG_NF_NAT_NEEDED
 594                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
 595                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
 596 #endif
 597 #ifdef CONFIG_NF_CONNTRACK_MARK
 598                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
 599 #endif
 600                + ctnetlink_proto_size(ct)
 601                + ctnetlink_label_size(ct)
 602                ;
 603 }
 604
 605 #ifdef CONFIG_NF_CONNTRACK_EVENTS
 606 static int
 607 ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
 608 {
 609         struct net *net;
 610         struct nlmsghdr *nlh;
 611         struct nfgenmsg *nfmsg;
 612         struct nlattr *nest_parms;
 613         struct nf_conn *ct = item->ct;
 614         struct sk_buff *skb;
 615         unsigned int type;
 616         unsigned int flags = 0, group;
 617         int err;
 618
 619         /* ignore our fake conntrack entry */
 620         if (nf_ct_is_untracked(ct))
 621                 return 0;
 622
 623         if (events & (1 << IPCT_DESTROY)) {
 624                 type = IPCTNL_MSG_CT_DELETE;
 625                 group = NFNLGRP_CONNTRACK_DESTROY;
 626         } else  if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
 627                 type = IPCTNL_MSG_CT_NEW;
 628                 flags = NLM_F_CREATE|NLM_F_EXCL;
 629                 group = NFNLGRP_CONNTRACK_NEW;
 630         } else  if (events) {
 631                 type = IPCTNL_MSG_CT_NEW;
 632                 group = NFNLGRP_CONNTRACK_UPDATE;
 633         } else
 634                 return 0;
 635
 636         net = nf_ct_net(ct);
 637         if (!item->report && !nfnetlink_has_listeners(net, group))
 638                 return 0;
 639
 640         skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
 641         if (skb == NULL)
 642                 goto errout;
 643
 644         type |= NFNL_SUBSYS_CTNETLINK << 8;
 645         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
 646         if (nlh == NULL)
 647                 goto nlmsg_failure;
 648
 649         nfmsg = nlmsg_data(nlh);
 650         nfmsg->nfgen_family = nf_ct_l3num(ct);
 651         nfmsg->version  = NFNETLINK_V0;
 652         nfmsg->res_id   = 0;
 653
 654         rcu_read_lock();
 655         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 656         if (!nest_parms)
 657                 goto nla_put_failure;
 658         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 659                 goto nla_put_failure;
 660         nla_nest_end(skb, nest_parms);
 661
 662         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 663         if (!nest_parms)
 664                 goto nla_put_failure;
 665         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
 666                 goto nla_put_failure;
 667         nla_nest_end(skb, nest_parms);
 668
 669         if (nf_ct_zone(ct) &&
 670             nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
 671                 goto nla_put_failure;
 672
 673         if (ctnetlink_dump_id(skb, ct) < 0)
 674                 goto nla_put_failure;
 675
 676         if (ctnetlink_dump_status(skb, ct) < 0)
 677                 goto nla_put_failure;
 678
 679         if (events & (1 << IPCT_DESTROY)) {
 680                 if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
 681                     ctnetlink_dump_timestamp(skb, ct) < 0)
 682                         goto nla_put_failure;
 683         } else {
 684                 if (ctnetlink_dump_timeout(skb, ct) < 0)
 685                         goto nla_put_failure;
 686
 687                 if (events & (1 << IPCT_PROTOINFO)
 688                     && ctnetlink_dump_protoinfo(skb, ct) < 0)
 689                         goto nla_put_failure;
 690
 691                 if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
 692                     && ctnetlink_dump_helpinfo(skb, ct) < 0)
 693                         goto nla_put_failure;
 694
 695 #ifdef CONFIG_NF_CONNTRACK_SECMARK
 696                 if ((events & (1 << IPCT_SECMARK) || ct->secmark)
 697                     && ctnetlink_dump_secctx(skb, ct) < 0)
 698                         goto nla_put_failure;
 699 #endif
 700                 if (events & (1 << IPCT_LABEL) &&
 701                      ctnetlink_dump_labels(skb, ct) < 0)
 702                         goto nla_put_failure;
 703
 704                 if (events & (1 << IPCT_RELATED) &&
 705                     ctnetlink_dump_master(skb, ct) < 0)
 706                         goto nla_put_failure;
 707
 708                 if (events & (1 << IPCT_SEQADJ) &&
 709                     ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
 710                         goto nla_put_failure;
 711         }
 712
 713 #ifdef CONFIG_NF_CONNTRACK_MARK
 714         if ((events & (1 << IPCT_MARK) || ct->mark)
 715             && ctnetlink_dump_mark(skb, ct) < 0)
 716                 goto nla_put_failure;
 717 #endif
 718         rcu_read_unlock();
 719
 720         nlmsg_end(skb, nlh);
 721         err = nfnetlink_send(skb, net, item->portid, group, item->report,
 722                              GFP_ATOMIC);
 723         if (err == -ENOBUFS || err == -EAGAIN)
 724                 return -ENOBUFS;
 725
 726         return 0;
 727
 728 nla_put_failure:
 729         rcu_read_unlock();
 730         nlmsg_cancel(skb, nlh);
 731 nlmsg_failure:
 732         kfree_skb(skb);
 733 errout:
 734         if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
 735                 return -ENOBUFS;
 736
 737         return 0;
 738 }
 739 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
 740
 741 static int ctnetlink_done(struct netlink_callback *cb)
 742 {
 743         if (cb->args[1])
 744                 nf_ct_put((struct nf_conn *)cb->args[1]);
 745         if (cb->data)
 746                 kfree(cb->data);
 747         return 0;
 748 }
 749
 750 struct ctnetlink_dump_filter {
 751         struct {
 752                 u_int32_t val;
 753                 u_int32_t mask;
 754         } mark;
 755 };
 756
 757 static int
 758 ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 759 {
 760         struct net *net = sock_net(skb->sk);
 761         struct nf_conn *ct, *last;
 762         struct nf_conntrack_tuple_hash *h;
 763         struct hlist_nulls_node *n;
 764         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
 765         u_int8_t l3proto = nfmsg->nfgen_family;
 766         int res;
 767 #ifdef CONFIG_NF_CONNTRACK_MARK
 768         const struct ctnetlink_dump_filter *filter = cb->data;
 769 #endif
 770
 771         spin_lock_bh(&nf_conntrack_lock);
 772         last = (struct nf_conn *)cb->args[1];
 773         for (; cb->args[0] < net->ct.htable_size; cb->args[0]++) {
 774 restart:
 775                 hlist_nulls_for_each_entry(h, n, &net->ct.hash[cb->args[0]],
 776                                          hnnode) {
 777                         if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 778                                 continue;
 779                         ct = nf_ct_tuplehash_to_ctrack(h);
 780                         /* Dump entries of a given L3 protocol number.
 781                          * If it is not specified, ie. l3proto == 0,
 782                          * then dump everything. */
 783                         if (l3proto && nf_ct_l3num(ct) != l3proto)
 784                                 continue;
 785                         if (cb->args[1]) {
 786                                 if (ct != last)
 787                                         continue;
 788                                 cb->args[1] = 0;
 789                         }
 790 #ifdef CONFIG_NF_CONNTRACK_MARK
 791                         if (filter && !((ct->mark & filter->mark.mask) ==
 792                                         filter->mark.val)) {
 793                                 continue;
 794                         }
 795 #endif
 796                         rcu_read_lock();
 797                         res =
 798                         ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
 799                                             cb->nlh->nlmsg_seq,
 800                                             NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
 801                                             ct);
 802                         rcu_read_unlock();
 803                         if (res < 0) {
 804                                 nf_conntrack_get(&ct->ct_general);
 805                                 cb->args[1] = (unsigned long)ct;
 806                                 goto out;
 807                         }
 808                 }
 809                 if (cb->args[1]) {
 810                         cb->args[1] = 0;
 811                         goto restart;
 812                 }
 813         }
 814 out:
 815         spin_unlock_bh(&nf_conntrack_lock);
 816         if (last)
 817                 nf_ct_put(last);
 818
 819         return skb->len;
 820 }
 821
 822 static inline int
 823 ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 824 {
 825         struct nlattr *tb[CTA_IP_MAX+1];
 826         struct nf_conntrack_l3proto *l3proto;
 827         int ret = 0;
 828
 829         ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 830         if (ret < 0)
 831                 return ret;
 832
 833         rcu_read_lock();
 834         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 835
 836         if (likely(l3proto->nlattr_to_tuple)) {
 837                 ret = nla_validate_nested(attr, CTA_IP_MAX,
 838                                           l3proto->nla_policy);
 839                 if (ret == 0)
 840                         ret = l3proto->nlattr_to_tuple(tb, tuple);
 841         }
 842
 843         rcu_read_unlock();
 844
 845         return ret;
 846 }
 847
 848 static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 849         [CTA_PROTO_NUM] = { .type = NLA_U8 },
 850 };
 851
 852 static inline int
 853 ctnetlink_parse_tuple_proto(struct nlattr *attr,
 854                             struct nf_conntrack_tuple *tuple)
 855 {
 856         struct nlattr *tb[CTA_PROTO_MAX+1];
 857         struct nf_conntrack_l4proto *l4proto;
 858         int ret = 0;
 859
 860         ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 861         if (ret < 0)
 862                 return ret;
 863
 864         if (!tb[CTA_PROTO_NUM])
 865                 return -EINVAL;
 866         tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 867
 868         rcu_read_lock();
 869         l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 870
 871         if (likely(l4proto->nlattr_to_tuple)) {
 872                 ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 873                                           l4proto->nla_policy);
 874                 if (ret == 0)
 875                         ret = l4proto->nlattr_to_tuple(tb, tuple);
 876         }
 877
 878         rcu_read_unlock();
 879
 880         return ret;
 881 }
 882
 883 static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
 884         [CTA_TUPLE_IP]          = { .type = NLA_NESTED },
 885         [CTA_TUPLE_PROTO]       = { .type = NLA_NESTED },
 886 };
 887
 888 static int
 889 ctnetlink_parse_tuple(const struct nlattr * const cda[],
 890                       struct nf_conntrack_tuple *tuple,
 891                       enum ctattr_type type, u_int8_t l3num)
 892 {
 893         struct nlattr *tb[CTA_TUPLE_MAX+1];
 894         int err;
 895
 896         memset(tuple, 0, sizeof(*tuple));
 897
 898         err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
 899         if (err < 0)
 900                 return err;
 901
 902         if (!tb[CTA_TUPLE_IP])
 903                 return -EINVAL;
 904
 905         tuple->src.l3num = l3num;
 906
 907         err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 908         if (err < 0)
 909                 return err;
 910
 911         if (!tb[CTA_TUPLE_PROTO])
 912                 return -EINVAL;
 913
 914         err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 915         if (err < 0)
 916                 return err;
 917
 918         /* orig and expect tuples get DIR_ORIGINAL */
 919         if (type == CTA_TUPLE_REPLY)
 920                 tuple->dst.dir = IP_CT_DIR_REPLY;
 921         else
 922                 tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 923
 924         return 0;
 925 }
 926
 927 static int
 928 ctnetlink_parse_zone(const struct nlattr *attr, u16 *zone)
 929 {
 930         if (attr)
 931 #ifdef CONFIG_NF_CONNTRACK_ZONES
 932                 *zone = ntohs(nla_get_be16(attr));
 933 #else
 934                 return -EOPNOTSUPP;
 935 #endif
 936         else
 937                 *zone = 0;
 938
 939         return 0;
 940 }
 941
 942 static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
 943         [CTA_HELP_NAME]         = { .type = NLA_NUL_STRING,
 944                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
 945 };
 946
 947 static inline int
 948 ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
 949                      struct nlattr **helpinfo)
 950 {
 951         int err;
 952         struct nlattr *tb[CTA_HELP_MAX+1];
 953
 954         err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
 955         if (err < 0)
 956                 return err;
 957
 958         if (!tb[CTA_HELP_NAME])
 959                 return -EINVAL;
 960
 961         *helper_name = nla_data(tb[CTA_HELP_NAME]);
 962
 963         if (tb[CTA_HELP_INFO])
 964                 *helpinfo = tb[CTA_HELP_INFO];
 965
 966         return 0;
 967 }
 968
 969 #define __CTA_LABELS_MAX_LENGTH ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
 970 static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 971         [CTA_TUPLE_ORIG]        = { .type = NLA_NESTED },
 972         [CTA_TUPLE_REPLY]       = { .type = NLA_NESTED },
 973         [CTA_STATUS]            = { .type = NLA_U32 },
 974         [CTA_PROTOINFO]         = { .type = NLA_NESTED },
 975         [CTA_HELP]              = { .type = NLA_NESTED },
 976         [CTA_NAT_SRC]           = { .type = NLA_NESTED },
 977         [CTA_TIMEOUT]           = { .type = NLA_U32 },
 978         [CTA_MARK]              = { .type = NLA_U32 },
 979         [CTA_ID]                = { .type = NLA_U32 },
 980         [CTA_NAT_DST]           = { .type = NLA_NESTED },
 981         [CTA_TUPLE_MASTER]      = { .type = NLA_NESTED },
 982         [CTA_NAT_SEQ_ADJ_ORIG]  = { .type = NLA_NESTED },
 983         [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
 984         [CTA_ZONE]              = { .type = NLA_U16 },
 985         [CTA_MARK_MASK]         = { .type = NLA_U32 },
 986         [CTA_LABELS]            = { .type = NLA_BINARY,
 987                                     .len = __CTA_LABELS_MAX_LENGTH },
 988         [CTA_LABELS_MASK]       = { .type = NLA_BINARY,
 989                                     .len = __CTA_LABELS_MAX_LENGTH },
 990 };
 991
 992 static int
 993 ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 994                         const struct nlmsghdr *nlh,
 995                         const struct nlattr * const cda[])
 996 {
 997         struct net *net = sock_net(ctnl);
 998         struct nf_conntrack_tuple_hash *h;
 999         struct nf_conntrack_tuple tuple;
1000         struct nf_conn *ct;
1001         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1002         u_int8_t u3 = nfmsg->nfgen_family;
1003         u16 zone;
1004         int err;
1005
1006         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1007         if (err < 0)
1008                 return err;
1009
1010         if (cda[CTA_TUPLE_ORIG])
1011                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1012         else if (cda[CTA_TUPLE_REPLY])
1013                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1014         else {
1015                 /* Flush the whole table */
1016                 nf_conntrack_flush_report(net,
1017                                          NETLINK_CB(skb).portid,
1018                                          nlmsg_report(nlh));
1019                 return 0;
1020         }
1021
1022         if (err < 0)
1023                 return err;
1024
1025         h = nf_conntrack_find_get(net, zone, &tuple);
1026         if (!h)
1027                 return -ENOENT;
1028
1029         ct = nf_ct_tuplehash_to_ctrack(h);
1030
1031         if (cda[CTA_ID]) {
1032                 u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
1033                 if (id != (u32)(unsigned long)ct) {
1034                         nf_ct_put(ct);
1035                         return -ENOENT;
1036                 }
1037         }
1038
1039         if (del_timer(&ct->timeout))
1040                 nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
1041
1042         nf_ct_put(ct);
1043
1044         return 0;
1045 }
1046
1047 static int
1048 ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
1049                         const struct nlmsghdr *nlh,
1050                         const struct nlattr * const cda[])
1051 {
1052         struct net *net = sock_net(ctnl);
1053         struct nf_conntrack_tuple_hash *h;
1054         struct nf_conntrack_tuple tuple;
1055         struct nf_conn *ct;
1056         struct sk_buff *skb2 = NULL;
1057         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1058         u_int8_t u3 = nfmsg->nfgen_family;
1059         u16 zone;
1060         int err;
1061
1062         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1063                 struct netlink_dump_control c = {
1064                         .dump = ctnetlink_dump_table,
1065                         .done = ctnetlink_done,
1066                 };
1067 #ifdef CONFIG_NF_CONNTRACK_MARK
1068                 if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
1069                         struct ctnetlink_dump_filter *filter;
1070
1071                         filter = kzalloc(sizeof(struct ctnetlink_dump_filter),
1072                                          GFP_ATOMIC);
1073                         if (filter == NULL)
1074                                 return -ENOMEM;
1075
1076                         filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
1077                         filter->mark.mask =
1078                                 ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
1079                         c.data = filter;
1080                 }
1081 #endif
1082                 return netlink_dump_start(ctnl, skb, nlh, &c);
1083         }
1084
1085         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1086         if (err < 0)
1087                 return err;
1088
1089         if (cda[CTA_TUPLE_ORIG])
1090                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
1091         else if (cda[CTA_TUPLE_REPLY])
1092                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
1093         else
1094                 return -EINVAL;
1095
1096         if (err < 0)
1097                 return err;
1098
1099         h = nf_conntrack_find_get(net, zone, &tuple);
1100         if (!h)
1101                 return -ENOENT;
1102
1103         ct = nf_ct_tuplehash_to_ctrack(h);
1104
1105         err = -ENOMEM;
1106         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1107         if (skb2 == NULL) {
1108                 nf_ct_put(ct);
1109                 return -ENOMEM;
1110         }
1111
1112         rcu_read_lock();
1113         err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
1114                                   NFNL_MSG_TYPE(nlh->nlmsg_type), ct);
1115         rcu_read_unlock();
1116         nf_ct_put(ct);
1117         if (err <= 0)
1118                 goto free;
1119
1120         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1121         if (err < 0)
1122                 goto out;
1123
1124         return 0;
1125
1126 free:
1127         kfree_skb(skb2);
1128 out:
1129         /* this avoids a loop in nfnetlink. */
1130         return err == -EAGAIN ? -ENOBUFS : err;
1131 }
1132
1133 static int ctnetlink_done_list(struct netlink_callback *cb)
1134 {
1135         if (cb->args[1])
1136                 nf_ct_put((struct nf_conn *)cb->args[1]);
1137         return 0;
1138 }
1139
1140 static int
1141 ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb,
1142                     struct hlist_nulls_head *list)
1143 {
1144         struct nf_conn *ct, *last;
1145         struct nf_conntrack_tuple_hash *h;
1146         struct hlist_nulls_node *n;
1147         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
1148         u_int8_t l3proto = nfmsg->nfgen_family;
1149         int res;
1150
1151         if (cb->args[2])
1152                 return 0;
1153
1154         spin_lock_bh(&nf_conntrack_lock);
1155         last = (struct nf_conn *)cb->args[1];
1156 restart:
1157         hlist_nulls_for_each_entry(h, n, list, hnnode) {
1158                 ct = nf_ct_tuplehash_to_ctrack(h);
1159                 if (l3proto && nf_ct_l3num(ct) != l3proto)
1160                         continue;
1161                 if (cb->args[1]) {
1162                         if (ct != last)
1163                                 continue;
1164                         cb->args[1] = 0;
1165                 }
1166                 rcu_read_lock();
1167                 res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
1168                                           cb->nlh->nlmsg_seq,
1169                                           NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
1170                                           ct);
1171                 rcu_read_unlock();
1172                 if (res < 0) {
1173                         nf_conntrack_get(&ct->ct_general);
1174                         cb->args[1] = (unsigned long)ct;
1175                         goto out;
1176                 }
1177         }
1178         if (cb->args[1]) {
1179                 cb->args[1] = 0;
1180                 goto restart;
1181         } else
1182                 cb->args[2] = 1;
1183 out:
1184         spin_unlock_bh(&nf_conntrack_lock);
1185         if (last)
1186                 nf_ct_put(last);
1187
1188         return skb->len;
1189 }
1190
1191 static int
1192 ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
1193 {
1194         struct net *net = sock_net(skb->sk);
1195
1196         return ctnetlink_dump_list(skb, cb, &net->ct.dying);
1197 }
1198
1199 static int
1200 ctnetlink_get_ct_dying(struct sock *ctnl, struct sk_buff *skb,
1201                        const struct nlmsghdr *nlh,
1202                        const struct nlattr * const cda[])
1203 {
1204         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1205                 struct netlink_dump_control c = {
1206                         .dump = ctnetlink_dump_dying,
1207                         .done = ctnetlink_done_list,
1208                 };
1209                 return netlink_dump_start(ctnl, skb, nlh, &c);
1210         }
1211
1212         return -EOPNOTSUPP;
1213 }
1214
1215 static int
1216 ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
1217 {
1218         struct net *net = sock_net(skb->sk);
1219
1220         return ctnetlink_dump_list(skb, cb, &net->ct.unconfirmed);
1221 }
1222
1223 static int
1224 ctnetlink_get_ct_unconfirmed(struct sock *ctnl, struct sk_buff *skb,
1225                              const struct nlmsghdr *nlh,
1226                              const struct nlattr * const cda[])
1227 {
1228         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1229                 struct netlink_dump_control c = {
1230                         .dump = ctnetlink_dump_unconfirmed,
1231                         .done = ctnetlink_done_list,
1232                 };
1233                 return netlink_dump_start(ctnl, skb, nlh, &c);
1234         }
1235
1236         return -EOPNOTSUPP;
1237 }
1238
1239 #ifdef CONFIG_NF_NAT_NEEDED
1240 static int
1241 ctnetlink_parse_nat_setup(struct nf_conn *ct,
1242                           enum nf_nat_manip_type manip,
1243                           const struct nlattr *attr)
1244 {
1245         typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
1246         int err;
1247
1248         parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
1249         if (!parse_nat_setup) {
1250 #ifdef CONFIG_MODULES
1251                 rcu_read_unlock();
1252                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1253                 if (request_module("nf-nat") < 0) {
1254                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1255                         rcu_read_lock();
1256                         return -EOPNOTSUPP;
1257                 }
1258                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1259                 rcu_read_lock();
1260                 if (nfnetlink_parse_nat_setup_hook)
1261                         return -EAGAIN;
1262 #endif
1263                 return -EOPNOTSUPP;
1264         }
1265
1266         err = parse_nat_setup(ct, manip, attr);
1267         if (err == -EAGAIN) {
1268 #ifdef CONFIG_MODULES
1269                 rcu_read_unlock();
1270                 nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
1271                 if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
1272                         nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1273                         rcu_read_lock();
1274                         return -EOPNOTSUPP;
1275                 }
1276                 nfnl_lock(NFNL_SUBSYS_CTNETLINK);
1277                 rcu_read_lock();
1278 #else
1279                 err = -EOPNOTSUPP;
1280 #endif
1281         }
1282         return err;
1283 }
1284 #endif
1285
1286 static int
1287 ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
1288 {
1289         unsigned long d;
1290         unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
1291         d = ct->status ^ status;
1292
1293         if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
1294                 /* unchangeable */
1295                 return -EBUSY;
1296
1297         if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
1298                 /* SEEN_REPLY bit can only be set */
1299                 return -EBUSY;
1300
1301         if (d & IPS_ASSURED && !(status & IPS_ASSURED))
1302                 /* ASSURED bit can only be set */
1303                 return -EBUSY;
1304
1305         /* Be careful here, modifying NAT bits can screw up things,
1306          * so don't let users modify them directly if they don't pass
1307          * nf_nat_range. */
1308         ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
1309         return 0;
1310 }
1311
1312 static int
1313 ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
1314 {
1315 #ifdef CONFIG_NF_NAT_NEEDED
1316         int ret;
1317
1318         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
1319                                         cda[CTA_NAT_DST]);
1320         if (ret < 0)
1321                 return ret;
1322
1323         ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
1324                                         cda[CTA_NAT_SRC]);
1325         return ret;
1326 #else
1327         if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
1328                 return 0;
1329         return -EOPNOTSUPP;
1330 #endif
1331 }
1332
1333 static inline int
1334 ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
1335 {
1336         struct nf_conntrack_helper *helper;
1337         struct nf_conn_help *help = nfct_help(ct);
1338         char *helpname = NULL;
1339         struct nlattr *helpinfo = NULL;
1340         int err;
1341
1342         /* don't change helper of sibling connections */
1343         if (ct->master)
1344                 return -EBUSY;
1345
1346         err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1347         if (err < 0)
1348                 return err;
1349
1350         if (!strcmp(helpname, "")) {
1351                 if (help && help->helper) {
1352                         /* we had a helper before ... */
1353                         nf_ct_remove_expectations(ct);
1354                         RCU_INIT_POINTER(help->helper, NULL);
1355                 }
1356
1357                 return 0;
1358         }
1359
1360         helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1361                                             nf_ct_protonum(ct));
1362         if (helper == NULL) {
1363 #ifdef CONFIG_MODULES
1364                 spin_unlock_bh(&nf_conntrack_lock);
1365
1366                 if (request_module("nfct-helper-%s", helpname) < 0) {
1367                         spin_lock_bh(&nf_conntrack_lock);
1368                         return -EOPNOTSUPP;
1369                 }
1370
1371                 spin_lock_bh(&nf_conntrack_lock);
1372                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1373                                                     nf_ct_protonum(ct));
1374                 if (helper)
1375                         return -EAGAIN;
1376 #endif
1377                 return -EOPNOTSUPP;
1378         }
1379
1380         if (help) {
1381                 if (help->helper == helper) {
1382                         /* update private helper data if allowed. */
1383                         if (helper->from_nlattr)
1384                                 helper->from_nlattr(helpinfo, ct);
1385                         return 0;
1386                 } else
1387                         return -EBUSY;
1388         }
1389
1390         /* we cannot set a helper for an existing conntrack */
1391         return -EOPNOTSUPP;
1392 }
1393
1394 static inline int
1395 ctnetlink_change_timeout(struct nf_conn *ct, const struct nlattr * const cda[])
1396 {
1397         u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1398
1399         if (!del_timer(&ct->timeout))
1400                 return -ETIME;
1401
1402         ct->timeout.expires = jiffies + timeout * HZ;
1403         add_timer(&ct->timeout);
1404
1405         return 0;
1406 }
1407
1408 static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
1409         [CTA_PROTOINFO_TCP]     = { .type = NLA_NESTED },
1410         [CTA_PROTOINFO_DCCP]    = { .type = NLA_NESTED },
1411         [CTA_PROTOINFO_SCTP]    = { .type = NLA_NESTED },
1412 };
1413
1414 static inline int
1415 ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[])
1416 {
1417         const struct nlattr *attr = cda[CTA_PROTOINFO];
1418         struct nlattr *tb[CTA_PROTOINFO_MAX+1];
1419         struct nf_conntrack_l4proto *l4proto;
1420         int err = 0;
1421
1422         err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
1423         if (err < 0)
1424                 return err;
1425
1426         rcu_read_lock();
1427         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
1428         if (l4proto->from_nlattr)
1429                 err = l4proto->from_nlattr(tb, ct);
1430         rcu_read_unlock();
1431
1432         return err;
1433 }
1434
1435 static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
1436         [CTA_SEQADJ_CORRECTION_POS]     = { .type = NLA_U32 },
1437         [CTA_SEQADJ_OFFSET_BEFORE]      = { .type = NLA_U32 },
1438         [CTA_SEQADJ_OFFSET_AFTER]       = { .type = NLA_U32 },
1439 };
1440
1441 static inline int
1442 change_seq_adj(struct nf_ct_seqadj *seq, const struct nlattr * const attr)
1443 {
1444         int err;
1445         struct nlattr *cda[CTA_SEQADJ_MAX+1];
1446
1447         err = nla_parse_nested(cda, CTA_SEQADJ_MAX, attr, seqadj_policy);
1448         if (err < 0)
1449                 return err;
1450
1451         if (!cda[CTA_SEQADJ_CORRECTION_POS])
1452                 return -EINVAL;
1453
1454         seq->correction_pos =
1455                 ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
1456
1457         if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
1458                 return -EINVAL;
1459
1460         seq->offset_before =
1461                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
1462
1463         if (!cda[CTA_SEQADJ_OFFSET_AFTER])
1464                 return -EINVAL;
1465
1466         seq->offset_after =
1467                 ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
1468
1469         return 0;
1470 }
1471
1472 static int
1473 ctnetlink_change_seq_adj(struct nf_conn *ct,
1474                          const struct nlattr * const cda[])
1475 {
1476         struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
1477         int ret = 0;
1478
1479         if (!seqadj)
1480                 return 0;
1481
1482         if (cda[CTA_SEQ_ADJ_ORIG]) {
1483                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
1484                                      cda[CTA_SEQ_ADJ_ORIG]);
1485                 if (ret < 0)
1486                         return ret;
1487
1488                 ct->status |= IPS_SEQ_ADJUST;
1489         }
1490
1491         if (cda[CTA_SEQ_ADJ_REPLY]) {
1492                 ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
1493                                      cda[CTA_SEQ_ADJ_REPLY]);
1494                 if (ret < 0)
1495                         return ret;
1496
1497                 ct->status |= IPS_SEQ_ADJUST;
1498         }
1499
1500         return 0;
1501 }
1502
1503 static int
1504 ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
1505 {
1506 #ifdef CONFIG_NF_CONNTRACK_LABELS
1507         size_t len = nla_len(cda[CTA_LABELS]);
1508         const void *mask = cda[CTA_LABELS_MASK];
1509
1510         if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
1511                 return -EINVAL;
1512
1513         if (mask) {
1514                 if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
1515                     nla_len(cda[CTA_LABELS_MASK]) != len)
1516                         return -EINVAL;
1517                 mask = nla_data(cda[CTA_LABELS_MASK]);
1518         }
1519
1520         len /= sizeof(u32);
1521
1522         return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
1523 #else
1524         return -EOPNOTSUPP;
1525 #endif
1526 }
1527
1528 static int
1529 ctnetlink_change_conntrack(struct nf_conn *ct,
1530                            const struct nlattr * const cda[])
1531 {
1532         int err;
1533
1534         /* only allow NAT changes and master assignation for new conntracks */
1535         if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
1536                 return -EOPNOTSUPP;
1537
1538         if (cda[CTA_HELP]) {
1539                 err = ctnetlink_change_helper(ct, cda);
1540                 if (err < 0)
1541                         return err;
1542         }
1543
1544         if (cda[CTA_TIMEOUT]) {
1545                 err = ctnetlink_change_timeout(ct, cda);
1546                 if (err < 0)
1547                         return err;
1548         }
1549
1550         if (cda[CTA_STATUS]) {
1551                 err = ctnetlink_change_status(ct, cda);
1552                 if (err < 0)
1553                         return err;
1554         }
1555
1556         if (cda[CTA_PROTOINFO]) {
1557                 err = ctnetlink_change_protoinfo(ct, cda);
1558                 if (err < 0)
1559                         return err;
1560         }
1561
1562 #if defined(CONFIG_NF_CONNTRACK_MARK)
1563         if (cda[CTA_MARK])
1564                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1565 #endif
1566
1567         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1568                 err = ctnetlink_change_seq_adj(ct, cda);
1569                 if (err < 0)
1570                         return err;
1571         }
1572
1573         if (cda[CTA_LABELS]) {
1574                 err = ctnetlink_attach_labels(ct, cda);
1575                 if (err < 0)
1576                         return err;
1577         }
1578
1579         return 0;
1580 }
1581
1582 static struct nf_conn *
1583 ctnetlink_create_conntrack(struct net *net, u16 zone,
1584                            const struct nlattr * const cda[],
1585                            struct nf_conntrack_tuple *otuple,
1586                            struct nf_conntrack_tuple *rtuple,
1587                            u8 u3)
1588 {
1589         struct nf_conn *ct;
1590         int err = -EINVAL;
1591         struct nf_conntrack_helper *helper;
1592         struct nf_conn_tstamp *tstamp;
1593
1594         ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
1595         if (IS_ERR(ct))
1596                 return ERR_PTR(-ENOMEM);
1597
1598         if (!cda[CTA_TIMEOUT])
1599                 goto err1;
1600         ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1601
1602         ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1603
1604         rcu_read_lock();
1605         if (cda[CTA_HELP]) {
1606                 char *helpname = NULL;
1607                 struct nlattr *helpinfo = NULL;
1608
1609                 err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
1610                 if (err < 0)
1611                         goto err2;
1612
1613                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
1614                                                     nf_ct_protonum(ct));
1615                 if (helper == NULL) {
1616                         rcu_read_unlock();
1617 #ifdef CONFIG_MODULES
1618                         if (request_module("nfct-helper-%s", helpname) < 0) {
1619                                 err = -EOPNOTSUPP;
1620                                 goto err1;
1621                         }
1622
1623                         rcu_read_lock();
1624                         helper = __nf_conntrack_helper_find(helpname,
1625                                                             nf_ct_l3num(ct),
1626                                                             nf_ct_protonum(ct));
1627                         if (helper) {
1628                                 err = -EAGAIN;
1629                                 goto err2;
1630                         }
1631                         rcu_read_unlock();
1632 #endif
1633                         err = -EOPNOTSUPP;
1634                         goto err1;
1635                 } else {
1636                         struct nf_conn_help *help;
1637
1638                         help = nf_ct_helper_ext_add(ct, helper, GFP_ATOMIC);
1639                         if (help == NULL) {
1640                                 err = -ENOMEM;
1641                                 goto err2;
1642                         }
1643                         /* set private helper data if allowed. */
1644                         if (helper->from_nlattr)
1645                                 helper->from_nlattr(helpinfo, ct);
1646
1647                         /* not in hash table yet so not strictly necessary */
1648                         RCU_INIT_POINTER(help->helper, helper);
1649                 }
1650         } else {
1651                 /* try an implicit helper assignation */
1652                 err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
1653                 if (err < 0)
1654                         goto err2;
1655         }
1656
1657         err = ctnetlink_setup_nat(ct, cda);
1658         if (err < 0)
1659                 goto err2;
1660
1661         nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1662         nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
1663         nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
1664         nf_ct_labels_ext_add(ct);
1665
1666         /* we must add conntrack extensions before confirmation. */
1667         ct->status |= IPS_CONFIRMED;
1668
1669         if (cda[CTA_STATUS]) {
1670                 err = ctnetlink_change_status(ct, cda);
1671                 if (err < 0)
1672                         goto err2;
1673         }
1674
1675         if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
1676                 err = ctnetlink_change_seq_adj(ct, cda);
1677                 if (err < 0)
1678                         goto err2;
1679         }
1680
1681         memset(&ct->proto, 0, sizeof(ct->proto));
1682         if (cda[CTA_PROTOINFO]) {
1683                 err = ctnetlink_change_protoinfo(ct, cda);
1684                 if (err < 0)
1685                         goto err2;
1686         }
1687
1688 #if defined(CONFIG_NF_CONNTRACK_MARK)
1689         if (cda[CTA_MARK])
1690                 ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1691 #endif
1692
1693         /* setup master conntrack: this is a confirmed expectation */
1694         if (cda[CTA_TUPLE_MASTER]) {
1695                 struct nf_conntrack_tuple master;
1696                 struct nf_conntrack_tuple_hash *master_h;
1697                 struct nf_conn *master_ct;
1698
1699                 err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER, u3);
1700                 if (err < 0)
1701                         goto err2;
1702
1703                 master_h = nf_conntrack_find_get(net, zone, &master);
1704                 if (master_h == NULL) {
1705                         err = -ENOENT;
1706                         goto err2;
1707                 }
1708                 master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1709                 __set_bit(IPS_EXPECTED_BIT, &ct->status);
1710                 ct->master = master_ct;
1711         }
1712         tstamp = nf_conn_tstamp_find(ct);
1713         if (tstamp)
1714                 tstamp->start = ktime_to_ns(ktime_get_real());
1715
1716         err = nf_conntrack_hash_check_insert(ct);
1717         if (err < 0)
1718                 goto err2;
1719
1720         rcu_read_unlock();
1721
1722         return ct;
1723
1724 err2:
1725         rcu_read_unlock();
1726 err1:
1727         nf_conntrack_free(ct);
1728         return ERR_PTR(err);
1729 }
1730
1731 static int
1732 ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1733                         const struct nlmsghdr *nlh,
1734                         const struct nlattr * const cda[])
1735 {
1736         struct net *net = sock_net(ctnl);
1737         struct nf_conntrack_tuple otuple, rtuple;
1738         struct nf_conntrack_tuple_hash *h = NULL;
1739         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
1740         struct nf_conn *ct;
1741         u_int8_t u3 = nfmsg->nfgen_family;
1742         u16 zone;
1743         int err;
1744
1745         err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
1746         if (err < 0)
1747                 return err;
1748
1749         if (cda[CTA_TUPLE_ORIG]) {
1750                 err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1751                 if (err < 0)
1752                         return err;
1753         }
1754
1755         if (cda[CTA_TUPLE_REPLY]) {
1756                 err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1757                 if (err < 0)
1758                         return err;
1759         }
1760
1761         if (cda[CTA_TUPLE_ORIG])
1762                 h = nf_conntrack_find_get(net, zone, &otuple);
1763         else if (cda[CTA_TUPLE_REPLY])
1764                 h = nf_conntrack_find_get(net, zone, &rtuple);
1765
1766         if (h == NULL) {
1767                 err = -ENOENT;
1768                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
1769                         enum ip_conntrack_events events;
1770
1771                         if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
1772                                 return -EINVAL;
1773
1774                         ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
1775                                                         &rtuple, u3);
1776                         if (IS_ERR(ct))
1777                                 return PTR_ERR(ct);
1778
1779                         err = 0;
1780                         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
1781                                 events = IPCT_RELATED;
1782                         else
1783                                 events = IPCT_NEW;
1784
1785                         if (cda[CTA_LABELS] &&
1786                             ctnetlink_attach_labels(ct, cda) == 0)
1787                                 events |= (1 << IPCT_LABEL);
1788
1789                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1790                                                       (1 << IPCT_ASSURED) |
1791                                                       (1 << IPCT_HELPER) |
1792                                                       (1 << IPCT_PROTOINFO) |
1793                                                       (1 << IPCT_SEQADJ) |
1794                                                       (1 << IPCT_MARK) | events,
1795                                                       ct, NETLINK_CB(skb).portid,
1796                                                       nlmsg_report(nlh));
1797                         nf_ct_put(ct);
1798                 }
1799
1800                 return err;
1801         }
1802         /* implicit 'else' */
1803
1804         err = -EEXIST;
1805         ct = nf_ct_tuplehash_to_ctrack(h);
1806         if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1807                 spin_lock_bh(&nf_conntrack_lock);
1808                 err = ctnetlink_change_conntrack(ct, cda);
1809                 spin_unlock_bh(&nf_conntrack_lock);
1810                 if (err == 0) {
1811                         nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
1812                                                       (1 << IPCT_ASSURED) |
1813                                                       (1 << IPCT_HELPER) |
1814                                                       (1 << IPCT_LABEL) |
1815                                                       (1 << IPCT_PROTOINFO) |
1816                                                       (1 << IPCT_SEQADJ) |
1817                                                       (1 << IPCT_MARK),
1818                                                       ct, NETLINK_CB(skb).portid,
1819                                                       nlmsg_report(nlh));
1820                 }
1821         }
1822
1823         nf_ct_put(ct);
1824         return err;
1825 }
1826
1827 static int
1828 ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
1829                                 __u16 cpu, const struct ip_conntrack_stat *st)
1830 {
1831         struct nlmsghdr *nlh;
1832         struct nfgenmsg *nfmsg;
1833         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1834
1835         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU);
1836         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1837         if (nlh == NULL)
1838                 goto nlmsg_failure;
1839
1840         nfmsg = nlmsg_data(nlh);
1841         nfmsg->nfgen_family = AF_UNSPEC;
1842         nfmsg->version      = NFNETLINK_V0;
1843         nfmsg->res_id       = htons(cpu);
1844
1845         if (nla_put_be32(skb, CTA_STATS_SEARCHED, htonl(st->searched)) ||
1846             nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
1847             nla_put_be32(skb, CTA_STATS_NEW, htonl(st->new)) ||
1848             nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
1849             nla_put_be32(skb, CTA_STATS_IGNORE, htonl(st->ignore)) ||
1850             nla_put_be32(skb, CTA_STATS_DELETE, htonl(st->delete)) ||
1851             nla_put_be32(skb, CTA_STATS_DELETE_LIST, htonl(st->delete_list)) ||
1852             nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
1853             nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
1854                                 htonl(st->insert_failed)) ||
1855             nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
1856             nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
1857             nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
1858             nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
1859                                 htonl(st->search_restart)))
1860                 goto nla_put_failure;
1861
1862         nlmsg_end(skb, nlh);
1863         return skb->len;
1864
1865 nla_put_failure:
1866 nlmsg_failure:
1867         nlmsg_cancel(skb, nlh);
1868         return -1;
1869 }
1870
1871 static int
1872 ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
1873 {
1874         int cpu;
1875         struct net *net = sock_net(skb->sk);
1876
1877         if (cb->args[0] == nr_cpu_ids)
1878                 return 0;
1879
1880         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
1881                 const struct ip_conntrack_stat *st;
1882
1883                 if (!cpu_possible(cpu))
1884                         continue;
1885
1886                 st = per_cpu_ptr(net->ct.stat, cpu);
1887                 if (ctnetlink_ct_stat_cpu_fill_info(skb,
1888                                                     NETLINK_CB(cb->skb).portid,
1889                                                     cb->nlh->nlmsg_seq,
1890                                                     cpu, st) < 0)
1891                                 break;
1892         }
1893         cb->args[0] = cpu;
1894
1895         return skb->len;
1896 }
1897
1898 static int
1899 ctnetlink_stat_ct_cpu(struct sock *ctnl, struct sk_buff *skb,
1900                       const struct nlmsghdr *nlh,
1901                       const struct nlattr * const cda[])
1902 {
1903         if (nlh->nlmsg_flags & NLM_F_DUMP) {
1904                 struct netlink_dump_control c = {
1905                         .dump = ctnetlink_ct_stat_cpu_dump,
1906                 };
1907                 return netlink_dump_start(ctnl, skb, nlh, &c);
1908         }
1909
1910         return 0;
1911 }
1912
1913 static int
1914 ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
1915                             struct net *net)
1916 {
1917         struct nlmsghdr *nlh;
1918         struct nfgenmsg *nfmsg;
1919         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
1920         unsigned int nr_conntracks = atomic_read(&net->ct.count);
1921
1922         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS);
1923         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
1924         if (nlh == NULL)
1925                 goto nlmsg_failure;
1926
1927         nfmsg = nlmsg_data(nlh);
1928         nfmsg->nfgen_family = AF_UNSPEC;
1929         nfmsg->version      = NFNETLINK_V0;
1930         nfmsg->res_id       = 0;
1931
1932         if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
1933                 goto nla_put_failure;
1934
1935         nlmsg_end(skb, nlh);
1936         return skb->len;
1937
1938 nla_put_failure:
1939 nlmsg_failure:
1940         nlmsg_cancel(skb, nlh);
1941         return -1;
1942 }
1943
1944 static int
1945 ctnetlink_stat_ct(struct sock *ctnl, struct sk_buff *skb,
1946                   const struct nlmsghdr *nlh,
1947                   const struct nlattr * const cda[])
1948 {
1949         struct sk_buff *skb2;
1950         int err;
1951
1952         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1953         if (skb2 == NULL)
1954                 return -ENOMEM;
1955
1956         err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
1957                                           nlh->nlmsg_seq,
1958                                           NFNL_MSG_TYPE(nlh->nlmsg_type),
1959                                           sock_net(skb->sk));
1960         if (err <= 0)
1961                 goto free;
1962
1963         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
1964         if (err < 0)
1965                 goto out;
1966
1967         return 0;
1968
1969 free:
1970         kfree_skb(skb2);
1971 out:
1972         /* this avoids a loop in nfnetlink. */
1973         return err == -EAGAIN ? -ENOBUFS : err;
1974 }
1975
1976 static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1977         [CTA_EXPECT_MASTER]     = { .type = NLA_NESTED },
1978         [CTA_EXPECT_TUPLE]      = { .type = NLA_NESTED },
1979         [CTA_EXPECT_MASK]       = { .type = NLA_NESTED },
1980         [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1981         [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1982         [CTA_EXPECT_HELP_NAME]  = { .type = NLA_NUL_STRING,
1983                                     .len = NF_CT_HELPER_NAME_LEN - 1 },
1984         [CTA_EXPECT_ZONE]       = { .type = NLA_U16 },
1985         [CTA_EXPECT_FLAGS]      = { .type = NLA_U32 },
1986         [CTA_EXPECT_CLASS]      = { .type = NLA_U32 },
1987         [CTA_EXPECT_NAT]        = { .type = NLA_NESTED },
1988         [CTA_EXPECT_FN]         = { .type = NLA_NUL_STRING },
1989 };
1990
1991 static struct nf_conntrack_expect *
1992 ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
1993                        struct nf_conntrack_helper *helper,
1994                        struct nf_conntrack_tuple *tuple,
1995                        struct nf_conntrack_tuple *mask);
1996
1997 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
1998 static size_t
1999 ctnetlink_nfqueue_build_size(const struct nf_conn *ct)
2000 {
2001         return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
2002                + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
2003                + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
2004                + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
2005                + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
2006                + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
2007                + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
2008                + nla_total_size(0) /* CTA_PROTOINFO */
2009                + nla_total_size(0) /* CTA_HELP */
2010                + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
2011                + ctnetlink_secctx_size(ct)
2012 #ifdef CONFIG_NF_NAT_NEEDED
2013                + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
2014                + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
2015 #endif
2016 #ifdef CONFIG_NF_CONNTRACK_MARK
2017                + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
2018 #endif
2019                + ctnetlink_proto_size(ct)
2020                ;
2021 }
2022
2023 static int
2024 ctnetlink_nfqueue_build(struct sk_buff *skb, struct nf_conn *ct)
2025 {
2026         struct nlattr *nest_parms;
2027
2028         rcu_read_lock();
2029         nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
2030         if (!nest_parms)
2031                 goto nla_put_failure;
2032         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
2033                 goto nla_put_failure;
2034         nla_nest_end(skb, nest_parms);
2035
2036         nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
2037         if (!nest_parms)
2038                 goto nla_put_failure;
2039         if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
2040                 goto nla_put_failure;
2041         nla_nest_end(skb, nest_parms);
2042
2043         if (nf_ct_zone(ct)) {
2044                 if (nla_put_be16(skb, CTA_ZONE, htons(nf_ct_zone(ct))))
2045                         goto nla_put_failure;
2046         }
2047
2048         if (ctnetlink_dump_id(skb, ct) < 0)
2049                 goto nla_put_failure;
2050
2051         if (ctnetlink_dump_status(skb, ct) < 0)
2052                 goto nla_put_failure;
2053
2054         if (ctnetlink_dump_timeout(skb, ct) < 0)
2055                 goto nla_put_failure;
2056
2057         if (ctnetlink_dump_protoinfo(skb, ct) < 0)
2058                 goto nla_put_failure;
2059
2060         if (ctnetlink_dump_helpinfo(skb, ct) < 0)
2061                 goto nla_put_failure;
2062
2063 #ifdef CONFIG_NF_CONNTRACK_SECMARK
2064         if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
2065                 goto nla_put_failure;
2066 #endif
2067         if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
2068                 goto nla_put_failure;
2069
2070         if ((ct->status & IPS_SEQ_ADJUST) &&
2071             ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
2072                 goto nla_put_failure;
2073
2074 #ifdef CONFIG_NF_CONNTRACK_MARK
2075         if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
2076                 goto nla_put_failure;
2077 #endif
2078         if (ctnetlink_dump_labels(skb, ct) < 0)
2079                 goto nla_put_failure;
2080         rcu_read_unlock();
2081         return 0;
2082
2083 nla_put_failure:
2084         rcu_read_unlock();
2085         return -ENOSPC;
2086 }
2087
2088 static int
2089 ctnetlink_nfqueue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
2090 {
2091         int err;
2092
2093         if (cda[CTA_TIMEOUT]) {
2094                 err = ctnetlink_change_timeout(ct, cda);
2095                 if (err < 0)
2096                         return err;
2097         }
2098         if (cda[CTA_STATUS]) {
2099                 err = ctnetlink_change_status(ct, cda);
2100                 if (err < 0)
2101                         return err;
2102         }
2103         if (cda[CTA_HELP]) {
2104                 err = ctnetlink_change_helper(ct, cda);
2105                 if (err < 0)
2106                         return err;
2107         }
2108         if (cda[CTA_LABELS]) {
2109                 err = ctnetlink_attach_labels(ct, cda);
2110                 if (err < 0)
2111                         return err;
2112         }
2113 #if defined(CONFIG_NF_CONNTRACK_MARK)
2114         if (cda[CTA_MARK]) {
2115                 u32 mask = 0, mark, newmark;
2116                 if (cda[CTA_MARK_MASK])
2117                         mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
2118
2119                 mark = ntohl(nla_get_be32(cda[CTA_MARK]));
2120                 newmark = (ct->mark & mask) ^ mark;
2121                 if (newmark != ct->mark)
2122                         ct->mark = newmark;
2123         }
2124 #endif
2125         return 0;
2126 }
2127
2128 static int
2129 ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
2130 {
2131         struct nlattr *cda[CTA_MAX+1];
2132         int ret;
2133
2134         ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
2135         if (ret < 0)
2136                 return ret;
2137
2138         spin_lock_bh(&nf_conntrack_lock);
2139         ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
2140         spin_unlock_bh(&nf_conntrack_lock);
2141
2142         return ret;
2143 }
2144
2145 static int ctnetlink_nfqueue_exp_parse(const struct nlattr * const *cda,
2146                                        const struct nf_conn *ct,
2147                                        struct nf_conntrack_tuple *tuple,
2148                                        struct nf_conntrack_tuple *mask)
2149 {
2150         int err;
2151
2152         err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
2153                                     nf_ct_l3num(ct));
2154         if (err < 0)
2155                 return err;
2156
2157         return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
2158                                      nf_ct_l3num(ct));
2159 }
2160
2161 static int
2162 ctnetlink_nfqueue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
2163                                 u32 portid, u32 report)
2164 {
2165         struct nlattr *cda[CTA_EXPECT_MAX+1];
2166         struct nf_conntrack_tuple tuple, mask;
2167         struct nf_conntrack_helper *helper = NULL;
2168         struct nf_conntrack_expect *exp;
2169         int err;
2170
2171         err = nla_parse_nested(cda, CTA_EXPECT_MAX, attr, exp_nla_policy);
2172         if (err < 0)
2173                 return err;
2174
2175         err = ctnetlink_nfqueue_exp_parse((const struct nlattr * const *)cda,
2176                                           ct, &tuple, &mask);
2177         if (err < 0)
2178                 return err;
2179
2180         if (cda[CTA_EXPECT_HELP_NAME]) {
2181                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2182
2183                 helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
2184                                                     nf_ct_protonum(ct));
2185                 if (helper == NULL)
2186                         return -EOPNOTSUPP;
2187         }
2188
2189         exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
2190                                      helper, &tuple, &mask);
2191         if (IS_ERR(exp))
2192                 return PTR_ERR(exp);
2193
2194         err = nf_ct_expect_related_report(exp, portid, report);
2195         if (err < 0) {
2196                 nf_ct_expect_put(exp);
2197                 return err;
2198         }
2199
2200         return 0;
2201 }
2202
2203 static struct nfq_ct_hook ctnetlink_nfqueue_hook = {
2204         .build_size     = ctnetlink_nfqueue_build_size,
2205         .build          = ctnetlink_nfqueue_build,
2206         .parse          = ctnetlink_nfqueue_parse,
2207         .attach_expect  = ctnetlink_nfqueue_attach_expect,
2208         .seq_adjust     = nf_ct_tcp_seqadj_set,
2209 };
2210 #endif /* CONFIG_NETFILTER_NETLINK_QUEUE_CT */
2211
2212 /***********************************************************************
2213  * EXPECT
2214  ***********************************************************************/
2215
2216 static inline int
2217 ctnetlink_exp_dump_tuple(struct sk_buff *skb,
2218                          const struct nf_conntrack_tuple *tuple,
2219                          enum ctattr_expect type)
2220 {
2221         struct nlattr *nest_parms;
2222
2223         nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
2224         if (!nest_parms)
2225                 goto nla_put_failure;
2226         if (ctnetlink_dump_tuples(skb, tuple) < 0)
2227                 goto nla_put_failure;
2228         nla_nest_end(skb, nest_parms);
2229
2230         return 0;
2231
2232 nla_put_failure:
2233         return -1;
2234 }
2235
2236 static inline int
2237 ctnetlink_exp_dump_mask(struct sk_buff *skb,
2238                         const struct nf_conntrack_tuple *tuple,
2239                         const struct nf_conntrack_tuple_mask *mask)
2240 {
2241         int ret;
2242         struct nf_conntrack_l3proto *l3proto;
2243         struct nf_conntrack_l4proto *l4proto;
2244         struct nf_conntrack_tuple m;
2245         struct nlattr *nest_parms;
2246
2247         memset(&m, 0xFF, sizeof(m));
2248         memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
2249         m.src.u.all = mask->src.u.all;
2250         m.dst.protonum = tuple->dst.protonum;
2251
2252         nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
2253         if (!nest_parms)
2254                 goto nla_put_failure;
2255
2256         rcu_read_lock();
2257         l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
2258         ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
2259         if (ret >= 0) {
2260                 l4proto = __nf_ct_l4proto_find(tuple->src.l3num,
2261                                                tuple->dst.protonum);
2262         ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
2263         }
2264         rcu_read_unlock();
2265
2266         if (unlikely(ret < 0))
2267                 goto nla_put_failure;
2268
2269         nla_nest_end(skb, nest_parms);
2270
2271         return 0;
2272
2273 nla_put_failure:
2274         return -1;
2275 }
2276
2277 static const union nf_inet_addr any_addr;
2278
2279 static int
2280 ctnetlink_exp_dump_expect(struct sk_buff *skb,
2281                           const struct nf_conntrack_expect *exp)
2282 {
2283         struct nf_conn *master = exp->master;
2284         long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
2285         struct nf_conn_help *help;
2286 #ifdef CONFIG_NF_NAT_NEEDED
2287         struct nlattr *nest_parms;
2288         struct nf_conntrack_tuple nat_tuple = {};
2289 #endif
2290         struct nf_ct_helper_expectfn *expfn;
2291
2292         if (timeout < 0)
2293                 timeout = 0;
2294
2295         if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
2296                 goto nla_put_failure;
2297         if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
2298                 goto nla_put_failure;
2299         if (ctnetlink_exp_dump_tuple(skb,
2300                                  &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
2301                                  CTA_EXPECT_MASTER) < 0)
2302                 goto nla_put_failure;
2303
2304 #ifdef CONFIG_NF_NAT_NEEDED
2305         if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
2306             exp->saved_proto.all) {
2307                 nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT | NLA_F_NESTED);
2308                 if (!nest_parms)
2309                         goto nla_put_failure;
2310
2311                 if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
2312                         goto nla_put_failure;
2313
2314                 nat_tuple.src.l3num = nf_ct_l3num(master);
2315                 nat_tuple.src.u3 = exp->saved_addr;
2316                 nat_tuple.dst.protonum = nf_ct_protonum(master);
2317                 nat_tuple.src.u = exp->saved_proto;
2318
2319                 if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
2320                                                 CTA_EXPECT_NAT_TUPLE) < 0)
2321                         goto nla_put_failure;
2322                 nla_nest_end(skb, nest_parms);
2323         }
2324 #endif
2325         if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
2326             nla_put_be32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)) ||
2327             nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
2328             nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
2329                 goto nla_put_failure;
2330         help = nfct_help(master);
2331         if (help) {
2332                 struct nf_conntrack_helper *helper;
2333
2334                 helper = rcu_dereference(help->helper);
2335                 if (helper &&
2336                     nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
2337                         goto nla_put_failure;
2338         }
2339         expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
2340         if (expfn != NULL &&
2341             nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
2342                 goto nla_put_failure;
2343
2344         return 0;
2345
2346 nla_put_failure:
2347         return -1;
2348 }
2349
2350 static int
2351 ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
2352                         int event, const struct nf_conntrack_expect *exp)
2353 {
2354         struct nlmsghdr *nlh;
2355         struct nfgenmsg *nfmsg;
2356         unsigned int flags = portid ? NLM_F_MULTI : 0;
2357
2358         event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2359         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
2360         if (nlh == NULL)
2361                 goto nlmsg_failure;
2362
2363         nfmsg = nlmsg_data(nlh);
2364         nfmsg->nfgen_family = exp->tuple.src.l3num;
2365         nfmsg->version      = NFNETLINK_V0;
2366         nfmsg->res_id       = 0;
2367
2368         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2369                 goto nla_put_failure;
2370
2371         nlmsg_end(skb, nlh);
2372         return skb->len;
2373
2374 nlmsg_failure:
2375 nla_put_failure:
2376         nlmsg_cancel(skb, nlh);
2377         return -1;
2378 }
2379
2380 #ifdef CONFIG_NF_CONNTRACK_EVENTS
2381 static int
2382 ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
2383 {
2384         struct nf_conntrack_expect *exp = item->exp;
2385         struct net *net = nf_ct_exp_net(exp);
2386         struct nlmsghdr *nlh;
2387         struct nfgenmsg *nfmsg;
2388         struct sk_buff *skb;
2389         unsigned int type, group;
2390         int flags = 0;
2391
2392         if (events & (1 << IPEXP_DESTROY)) {
2393                 type = IPCTNL_MSG_EXP_DELETE;
2394                 group = NFNLGRP_CONNTRACK_EXP_DESTROY;
2395         } else if (events & (1 << IPEXP_NEW)) {
2396                 type = IPCTNL_MSG_EXP_NEW;
2397                 flags = NLM_F_CREATE|NLM_F_EXCL;
2398                 group = NFNLGRP_CONNTRACK_EXP_NEW;
2399         } else
2400                 return 0;
2401
2402         if (!item->report && !nfnetlink_has_listeners(net, group))
2403                 return 0;
2404
2405         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2406         if (skb == NULL)
2407                 goto errout;
2408
2409         type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
2410         nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
2411         if (nlh == NULL)
2412                 goto nlmsg_failure;
2413
2414         nfmsg = nlmsg_data(nlh);
2415         nfmsg->nfgen_family = exp->tuple.src.l3num;
2416         nfmsg->version      = NFNETLINK_V0;
2417         nfmsg->res_id       = 0;
2418
2419         rcu_read_lock();
2420         if (ctnetlink_exp_dump_expect(skb, exp) < 0)
2421                 goto nla_put_failure;
2422         rcu_read_unlock();
2423
2424         nlmsg_end(skb, nlh);
2425         nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
2426         return 0;
2427
2428 nla_put_failure:
2429         rcu_read_unlock();
2430         nlmsg_cancel(skb, nlh);
2431 nlmsg_failure:
2432         kfree_skb(skb);
2433 errout:
2434         nfnetlink_set_err(net, 0, 0, -ENOBUFS);
2435         return 0;
2436 }
2437 #endif
2438 static int ctnetlink_exp_done(struct netlink_callback *cb)
2439 {
2440         if (cb->args[1])
2441                 nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
2442         return 0;
2443 }
2444
2445 static int
2446 ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2447 {
2448         struct net *net = sock_net(skb->sk);
2449         struct nf_conntrack_expect *exp, *last;
2450         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2451         u_int8_t l3proto = nfmsg->nfgen_family;
2452
2453         rcu_read_lock();
2454         last = (struct nf_conntrack_expect *)cb->args[1];
2455         for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
2456 restart:
2457                 hlist_for_each_entry(exp, &net->ct.expect_hash[cb->args[0]],
2458                                      hnode) {
2459                         if (l3proto && exp->tuple.src.l3num != l3proto)
2460                                 continue;
2461                         if (cb->args[1]) {
2462                                 if (exp != last)
2463                                         continue;
2464                                 cb->args[1] = 0;
2465                         }
2466                         if (ctnetlink_exp_fill_info(skb,
2467                                                     NETLINK_CB(cb->skb).portid,
2468                                                     cb->nlh->nlmsg_seq,
2469                                                     IPCTNL_MSG_EXP_NEW,
2470                                                     exp) < 0) {
2471                                 if (!atomic_inc_not_zero(&exp->use))
2472                                         continue;
2473                                 cb->args[1] = (unsigned long)exp;
2474                                 goto out;
2475                         }
2476                 }
2477                 if (cb->args[1]) {
2478                         cb->args[1] = 0;
2479                         goto restart;
2480                 }
2481         }
2482 out:
2483         rcu_read_unlock();
2484         if (last)
2485                 nf_ct_expect_put(last);
2486
2487         return skb->len;
2488 }
2489
2490 static int
2491 ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
2492 {
2493         struct nf_conntrack_expect *exp, *last;
2494         struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
2495         struct nf_conn *ct = cb->data;
2496         struct nf_conn_help *help = nfct_help(ct);
2497         u_int8_t l3proto = nfmsg->nfgen_family;
2498
2499         if (cb->args[0])
2500                 return 0;
2501
2502         rcu_read_lock();
2503         last = (struct nf_conntrack_expect *)cb->args[1];
2504 restart:
2505         hlist_for_each_entry(exp, &help->expectations, lnode) {
2506                 if (l3proto && exp->tuple.src.l3num != l3proto)
2507                         continue;
2508                 if (cb->args[1]) {
2509                         if (exp != last)
2510                                 continue;
2511                         cb->args[1] = 0;
2512                 }
2513                 if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
2514                                             cb->nlh->nlmsg_seq,
2515                                             IPCTNL_MSG_EXP_NEW,
2516                                             exp) < 0) {
2517                         if (!atomic_inc_not_zero(&exp->use))
2518                                 continue;
2519                         cb->args[1] = (unsigned long)exp;
2520                         goto out;
2521                 }
2522         }
2523         if (cb->args[1]) {
2524                 cb->args[1] = 0;
2525                 goto restart;
2526         }
2527         cb->args[0] = 1;
2528 out:
2529         rcu_read_unlock();
2530         if (last)
2531                 nf_ct_expect_put(last);
2532
2533         return skb->len;
2534 }
2535
2536 static int ctnetlink_dump_exp_ct(struct sock *ctnl, struct sk_buff *skb,
2537                                  const struct nlmsghdr *nlh,
2538                                  const struct nlattr * const cda[])
2539 {
2540         int err;
2541         struct net *net = sock_net(ctnl);
2542         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2543         u_int8_t u3 = nfmsg->nfgen_family;
2544         struct nf_conntrack_tuple tuple;
2545         struct nf_conntrack_tuple_hash *h;
2546         struct nf_conn *ct;
2547         u16 zone = 0;
2548         struct netlink_dump_control c = {
2549                 .dump = ctnetlink_exp_ct_dump_table,
2550                 .done = ctnetlink_exp_done,
2551         };
2552
2553         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2554         if (err < 0)
2555                 return err;
2556
2557         if (cda[CTA_EXPECT_ZONE]) {
2558                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2559                 if (err < 0)
2560                         return err;
2561         }
2562
2563         h = nf_conntrack_find_get(net, zone, &tuple);
2564         if (!h)
2565                 return -ENOENT;
2566
2567         ct = nf_ct_tuplehash_to_ctrack(h);
2568         c.data = ct;
2569
2570         err = netlink_dump_start(ctnl, skb, nlh, &c);
2571         nf_ct_put(ct);
2572
2573         return err;
2574 }
2575
2576 static int
2577 ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
2578                      const struct nlmsghdr *nlh,
2579                      const struct nlattr * const cda[])
2580 {
2581         struct net *net = sock_net(ctnl);
2582         struct nf_conntrack_tuple tuple;
2583         struct nf_conntrack_expect *exp;
2584         struct sk_buff *skb2;
2585         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2586         u_int8_t u3 = nfmsg->nfgen_family;
2587         u16 zone;
2588         int err;
2589
2590         if (nlh->nlmsg_flags & NLM_F_DUMP) {
2591                 if (cda[CTA_EXPECT_MASTER])
2592                         return ctnetlink_dump_exp_ct(ctnl, skb, nlh, cda);
2593                 else {
2594                         struct netlink_dump_control c = {
2595                                 .dump = ctnetlink_exp_dump_table,
2596                                 .done = ctnetlink_exp_done,
2597                         };
2598                         return netlink_dump_start(ctnl, skb, nlh, &c);
2599                 }
2600         }
2601
2602         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2603         if (err < 0)
2604                 return err;
2605
2606         if (cda[CTA_EXPECT_TUPLE])
2607                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2608         else if (cda[CTA_EXPECT_MASTER])
2609                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
2610         else
2611                 return -EINVAL;
2612
2613         if (err < 0)
2614                 return err;
2615
2616         exp = nf_ct_expect_find_get(net, zone, &tuple);
2617         if (!exp)
2618                 return -ENOENT;
2619
2620         if (cda[CTA_EXPECT_ID]) {
2621                 __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2622                 if (ntohl(id) != (u32)(unsigned long)exp) {
2623                         nf_ct_expect_put(exp);
2624                         return -ENOENT;
2625                 }
2626         }
2627
2628         err = -ENOMEM;
2629         skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2630         if (skb2 == NULL) {
2631                 nf_ct_expect_put(exp);
2632                 goto out;
2633         }
2634
2635         rcu_read_lock();
2636         err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
2637                                       nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
2638         rcu_read_unlock();
2639         nf_ct_expect_put(exp);
2640         if (err <= 0)
2641                 goto free;
2642
2643         err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
2644         if (err < 0)
2645                 goto out;
2646
2647         return 0;
2648
2649 free:
2650         kfree_skb(skb2);
2651 out:
2652         /* this avoids a loop in nfnetlink. */
2653         return err == -EAGAIN ? -ENOBUFS : err;
2654 }
2655
2656 static int
2657 ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
2658                      const struct nlmsghdr *nlh,
2659                      const struct nlattr * const cda[])
2660 {
2661         struct net *net = sock_net(ctnl);
2662         struct nf_conntrack_expect *exp;
2663         struct nf_conntrack_tuple tuple;
2664         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2665         struct hlist_node *next;
2666         u_int8_t u3 = nfmsg->nfgen_family;
2667         unsigned int i;
2668         u16 zone;
2669         int err;
2670
2671         if (cda[CTA_EXPECT_TUPLE]) {
2672                 /* delete a single expect by tuple */
2673                 err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2674                 if (err < 0)
2675                         return err;
2676
2677                 err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2678                 if (err < 0)
2679                         return err;
2680
2681                 /* bump usage count to 2 */
2682                 exp = nf_ct_expect_find_get(net, zone, &tuple);
2683                 if (!exp)
2684                         return -ENOENT;
2685
2686                 if (cda[CTA_EXPECT_ID]) {
2687                         __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
2688                         if (ntohl(id) != (u32)(unsigned long)exp) {
2689                                 nf_ct_expect_put(exp);
2690                                 return -ENOENT;
2691                         }
2692                 }
2693
2694                 /* after list removal, usage count == 1 */
2695                 spin_lock_bh(&nf_conntrack_lock);
2696                 if (del_timer(&exp->timeout)) {
2697                         nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
2698                                                    nlmsg_report(nlh));
2699                         nf_ct_expect_put(exp);
2700                 }
2701                 spin_unlock_bh(&nf_conntrack_lock);
2702                 /* have to put what we 'get' above.
2703                  * after this line usage count == 0 */
2704                 nf_ct_expect_put(exp);
2705         } else if (cda[CTA_EXPECT_HELP_NAME]) {
2706                 char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2707                 struct nf_conn_help *m_help;
2708
2709                 /* delete all expectations for this helper */
2710                 spin_lock_bh(&nf_conntrack_lock);
2711                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2712                         hlist_for_each_entry_safe(exp, next,
2713                                                   &net->ct.expect_hash[i],
2714                                                   hnode) {
2715                                 m_help = nfct_help(exp->master);
2716                                 if (!strcmp(m_help->helper->name, name) &&
2717                                     del_timer(&exp->timeout)) {
2718                                         nf_ct_unlink_expect_report(exp,
2719                                                         NETLINK_CB(skb).portid,
2720                                                         nlmsg_report(nlh));
2721                                         nf_ct_expect_put(exp);
2722                                 }
2723                         }
2724                 }
2725                 spin_unlock_bh(&nf_conntrack_lock);
2726         } else {
2727                 /* This basically means we have to flush everything*/
2728                 spin_lock_bh(&nf_conntrack_lock);
2729                 for (i = 0; i < nf_ct_expect_hsize; i++) {
2730                         hlist_for_each_entry_safe(exp, next,
2731                                                   &net->ct.expect_hash[i],
2732                                                   hnode) {
2733                                 if (del_timer(&exp->timeout)) {
2734                                         nf_ct_unlink_expect_report(exp,
2735                                                         NETLINK_CB(skb).portid,
2736                                                         nlmsg_report(nlh));
2737                                         nf_ct_expect_put(exp);
2738                                 }
2739                         }
2740                 }
2741                 spin_unlock_bh(&nf_conntrack_lock);
2742         }
2743
2744         return 0;
2745 }
2746 static int
2747 ctnetlink_change_expect(struct nf_conntrack_expect *x,
2748                         const struct nlattr * const cda[])
2749 {
2750         if (cda[CTA_EXPECT_TIMEOUT]) {
2751                 if (!del_timer(&x->timeout))
2752                         return -ETIME;
2753
2754                 x->timeout.expires = jiffies +
2755                         ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2756                 add_timer(&x->timeout);
2757         }
2758         return 0;
2759 }
2760
2761 static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
2762         [CTA_EXPECT_NAT_DIR]    = { .type = NLA_U32 },
2763         [CTA_EXPECT_NAT_TUPLE]  = { .type = NLA_NESTED },
2764 };
2765
2766 static int
2767 ctnetlink_parse_expect_nat(const struct nlattr *attr,
2768                            struct nf_conntrack_expect *exp,
2769                            u_int8_t u3)
2770 {
2771 #ifdef CONFIG_NF_NAT_NEEDED
2772         struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
2773         struct nf_conntrack_tuple nat_tuple = {};
2774         int err;
2775
2776         err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
2777         if (err < 0)
2778                 return err;
2779
2780         if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
2781                 return -EINVAL;
2782
2783         err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
2784                                         &nat_tuple, CTA_EXPECT_NAT_TUPLE, u3);
2785         if (err < 0)
2786                 return err;
2787
2788         exp->saved_addr = nat_tuple.src.u3;
2789         exp->saved_proto = nat_tuple.src.u;
2790         exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
2791
2792         return 0;
2793 #else
2794         return -EOPNOTSUPP;
2795 #endif
2796 }
2797
2798 static struct nf_conntrack_expect *
2799 ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
2800                        struct nf_conntrack_helper *helper,
2801                        struct nf_conntrack_tuple *tuple,
2802                        struct nf_conntrack_tuple *mask)
2803 {
2804         u_int32_t class = 0;
2805         struct nf_conntrack_expect *exp;
2806         struct nf_conn_help *help;
2807         int err;
2808
2809         if (cda[CTA_EXPECT_CLASS] && helper) {
2810                 class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
2811                 if (class > helper->expect_class_max)
2812                         return ERR_PTR(-EINVAL);
2813         }
2814         exp = nf_ct_expect_alloc(ct);
2815         if (!exp)
2816                 return ERR_PTR(-ENOMEM);
2817
2818         help = nfct_help(ct);
2819         if (!help) {
2820                 if (!cda[CTA_EXPECT_TIMEOUT]) {
2821                         err = -EINVAL;
2822                         goto err_out;
2823                 }
2824                 exp->timeout.expires =
2825                   jiffies + ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
2826
2827                 exp->flags = NF_CT_EXPECT_USERSPACE;
2828                 if (cda[CTA_EXPECT_FLAGS]) {
2829                         exp->flags |=
2830                                 ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2831                 }
2832         } else {
2833                 if (cda[CTA_EXPECT_FLAGS]) {
2834                         exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
2835                         exp->flags &= ~NF_CT_EXPECT_USERSPACE;
2836                 } else
2837                         exp->flags = 0;
2838         }
2839         if (cda[CTA_EXPECT_FN]) {
2840                 const char *name = nla_data(cda[CTA_EXPECT_FN]);
2841                 struct nf_ct_helper_expectfn *expfn;
2842
2843                 expfn = nf_ct_helper_expectfn_find_by_name(name);
2844                 if (expfn == NULL) {
2845                         err = -EINVAL;
2846                         goto err_out;
2847                 }
2848                 exp->expectfn = expfn->expectfn;
2849         } else
2850                 exp->expectfn = NULL;
2851
2852         exp->class = class;
2853         exp->master = ct;
2854         exp->helper = helper;
2855         exp->tuple = *tuple;
2856         exp->mask.src.u3 = mask->src.u3;
2857         exp->mask.src.u.all = mask->src.u.all;
2858
2859         if (cda[CTA_EXPECT_NAT]) {
2860                 err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
2861                                                  exp, nf_ct_l3num(ct));
2862                 if (err < 0)
2863                         goto err_out;
2864         }
2865         return exp;
2866 err_out:
2867         nf_ct_expect_put(exp);
2868         return ERR_PTR(err);
2869 }
2870
2871 static int
2872 ctnetlink_create_expect(struct net *net, u16 zone,
2873                         const struct nlattr * const cda[],
2874                         u_int8_t u3, u32 portid, int report)
2875 {
2876         struct nf_conntrack_tuple tuple, mask, master_tuple;
2877         struct nf_conntrack_tuple_hash *h = NULL;
2878         struct nf_conntrack_helper *helper = NULL;
2879         struct nf_conntrack_expect *exp;
2880         struct nf_conn *ct;
2881         int err;
2882
2883         /* caller guarantees that those three CTA_EXPECT_* exist */
2884         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2885         if (err < 0)
2886                 return err;
2887         err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
2888         if (err < 0)
2889                 return err;
2890         err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
2891         if (err < 0)
2892                 return err;
2893
2894         /* Look for master conntrack of this expectation */
2895         h = nf_conntrack_find_get(net, zone, &master_tuple);
2896         if (!h)
2897                 return -ENOENT;
2898         ct = nf_ct_tuplehash_to_ctrack(h);
2899
2900         if (cda[CTA_EXPECT_HELP_NAME]) {
2901                 const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
2902
2903                 helper = __nf_conntrack_helper_find(helpname, u3,
2904                                                     nf_ct_protonum(ct));
2905                 if (helper == NULL) {
2906 #ifdef CONFIG_MODULES
2907                         if (request_module("nfct-helper-%s", helpname) < 0) {
2908                                 err = -EOPNOTSUPP;
2909                                 goto err_ct;
2910                         }
2911                         helper = __nf_conntrack_helper_find(helpname, u3,
2912                                                             nf_ct_protonum(ct));
2913                         if (helper) {
2914                                 err = -EAGAIN;
2915                                 goto err_ct;
2916                         }
2917 #endif
2918                         err = -EOPNOTSUPP;
2919                         goto err_ct;
2920                 }
2921         }
2922
2923         exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
2924         if (IS_ERR(exp)) {
2925                 err = PTR_ERR(exp);
2926                 goto err_ct;
2927         }
2928
2929         err = nf_ct_expect_related_report(exp, portid, report);
2930         if (err < 0)
2931                 goto err_exp;
2932
2933         return 0;
2934 err_exp:
2935         nf_ct_expect_put(exp);
2936 err_ct:
2937         nf_ct_put(ct);
2938         return err;
2939 }
2940
2941 static int
2942 ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
2943                      const struct nlmsghdr *nlh,
2944                      const struct nlattr * const cda[])
2945 {
2946         struct net *net = sock_net(ctnl);
2947         struct nf_conntrack_tuple tuple;
2948         struct nf_conntrack_expect *exp;
2949         struct nfgenmsg *nfmsg = nlmsg_data(nlh);
2950         u_int8_t u3 = nfmsg->nfgen_family;
2951         u16 zone;
2952         int err;
2953
2954         if (!cda[CTA_EXPECT_TUPLE]
2955             || !cda[CTA_EXPECT_MASK]
2956             || !cda[CTA_EXPECT_MASTER])
2957                 return -EINVAL;
2958
2959         err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
2960         if (err < 0)
2961                 return err;
2962
2963         err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
2964         if (err < 0)
2965                 return err;
2966
2967         spin_lock_bh(&nf_conntrack_lock);
2968         exp = __nf_ct_expect_find(net, zone, &tuple);
2969
2970         if (!exp) {
2971                 spin_unlock_bh(&nf_conntrack_lock);
2972                 err = -ENOENT;
2973                 if (nlh->nlmsg_flags & NLM_F_CREATE) {
2974                         err = ctnetlink_create_expect(net, zone, cda,
2975                                                       u3,
2976                                                       NETLINK_CB(skb).portid,
2977                                                       nlmsg_report(nlh));
2978                 }
2979                 return err;
2980         }
2981
2982         err = -EEXIST;
2983         if (!(nlh->nlmsg_flags & NLM_F_EXCL))
2984                 err = ctnetlink_change_expect(exp, cda);
2985         spin_unlock_bh(&nf_conntrack_lock);
2986
2987         return err;
2988 }
2989
2990 static int
2991 ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
2992                              const struct ip_conntrack_stat *st)
2993 {
2994         struct nlmsghdr *nlh;
2995         struct nfgenmsg *nfmsg;
2996         unsigned int flags = portid ? NLM_F_MULTI : 0, event;
2997
2998         event = (NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU);
2999         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
3000         if (nlh == NULL)
3001                 goto nlmsg_failure;
3002
3003         nfmsg = nlmsg_data(nlh);
3004         nfmsg->nfgen_family = AF_UNSPEC;
3005         nfmsg->version      = NFNETLINK_V0;
3006         nfmsg->res_id       = htons(cpu);
3007
3008         if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
3009             nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
3010             nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
3011                 goto nla_put_failure;
3012
3013         nlmsg_end(skb, nlh);
3014         return skb->len;
3015
3016 nla_put_failure:
3017 nlmsg_failure:
3018         nlmsg_cancel(skb, nlh);
3019         return -1;
3020 }
3021
3022 static int
3023 ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
3024 {
3025         int cpu;
3026         struct net *net = sock_net(skb->sk);
3027
3028         if (cb->args[0] == nr_cpu_ids)
3029                 return 0;
3030
3031         for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
3032                 const struct ip_conntrack_stat *st;
3033
3034                 if (!cpu_possible(cpu))
3035                         continue;
3036
3037                 st = per_cpu_ptr(net->ct.stat, cpu);
3038                 if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
3039                                                  cb->nlh->nlmsg_seq,
3040                                                  cpu, st) < 0)
3041                         break;
3042         }
3043         cb->args[0] = cpu;
3044
3045         return skb->len;
3046 }
3047
3048 static int
3049 ctnetlink_stat_exp_cpu(struct sock *ctnl, struct sk_buff *skb,
3050                        const struct nlmsghdr *nlh,
3051                        const struct nlattr * const cda[])
3052 {
3053         if (nlh->nlmsg_flags & NLM_F_DUMP) {
3054                 struct netlink_dump_control c = {
3055                         .dump = ctnetlink_exp_stat_cpu_dump,
3056                 };
3057                 return netlink_dump_start(ctnl, skb, nlh, &c);
3058         }
3059
3060         return 0;
3061 }
3062
3063 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3064 static struct nf_ct_event_notifier ctnl_notifier = {
3065         .fcn = ctnetlink_conntrack_event,
3066 };
3067
3068 static struct nf_exp_event_notifier ctnl_notifier_exp = {
3069         .fcn = ctnetlink_expect_event,
3070 };
3071 #endif
3072
3073 static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
3074         [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
3075                                             .attr_count = CTA_MAX,
3076                                             .policy = ct_nla_policy },
3077         [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
3078                                             .attr_count = CTA_MAX,
3079                                             .policy = ct_nla_policy },
3080         [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
3081                                             .attr_count = CTA_MAX,
3082                                             .policy = ct_nla_policy },
3083         [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
3084                                             .attr_count = CTA_MAX,
3085                                             .policy = ct_nla_policy },
3086         [IPCTNL_MSG_CT_GET_STATS_CPU]   = { .call = ctnetlink_stat_ct_cpu },
3087         [IPCTNL_MSG_CT_GET_STATS]       = { .call = ctnetlink_stat_ct },
3088         [IPCTNL_MSG_CT_GET_DYING]       = { .call = ctnetlink_get_ct_dying },
3089         [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
3090 };
3091
3092 static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
3093         [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
3094                                             .attr_count = CTA_EXPECT_MAX,
3095                                             .policy = exp_nla_policy },
3096         [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
3097                                             .attr_count = CTA_EXPECT_MAX,
3098                                             .policy = exp_nla_policy },
3099         [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
3100                                             .attr_count = CTA_EXPECT_MAX,
3101                                             .policy = exp_nla_policy },
3102         [IPCTNL_MSG_EXP_GET_STATS_CPU]  = { .call = ctnetlink_stat_exp_cpu },
3103 };
3104
3105 static const struct nfnetlink_subsystem ctnl_subsys = {
3106         .name                           = "conntrack",
3107         .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
3108         .cb_count                       = IPCTNL_MSG_MAX,
3109         .cb                             = ctnl_cb,
3110 };
3111
3112 static const struct nfnetlink_subsystem ctnl_exp_subsys = {
3113         .name                           = "conntrack_expect",
3114         .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
3115         .cb_count                       = IPCTNL_MSG_EXP_MAX,
3116         .cb                             = ctnl_exp_cb,
3117 };
3118
3119 MODULE_ALIAS("ip_conntrack_netlink");
3120 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
3121 MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
3122
3123 static int __net_init ctnetlink_net_init(struct net *net)
3124 {
3125 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3126         int ret;
3127
3128         ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
3129         if (ret < 0) {
3130                 pr_err("ctnetlink_init: cannot register notifier.\n");
3131                 goto err_out;
3132         }
3133
3134         ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
3135         if (ret < 0) {
3136                 pr_err("ctnetlink_init: cannot expect register notifier.\n");
3137                 goto err_unreg_notifier;
3138         }
3139 #endif
3140         return 0;
3141
3142 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3143 err_unreg_notifier:
3144         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3145 err_out:
3146         return ret;
3147 #endif
3148 }
3149
3150 static void ctnetlink_net_exit(struct net *net)
3151 {
3152 #ifdef CONFIG_NF_CONNTRACK_EVENTS
3153         nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
3154         nf_conntrack_unregister_notifier(net, &ctnl_notifier);
3155 #endif
3156 }
3157
3158 static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
3159 {
3160         struct net *net;
3161
3162         list_for_each_entry(net, net_exit_list, exit_list)
3163                 ctnetlink_net_exit(net);
3164 }
3165
3166 static struct pernet_operations ctnetlink_net_ops = {
3167         .init           = ctnetlink_net_init,
3168         .exit_batch     = ctnetlink_net_exit_batch,
3169 };
3170
3171 static int __init ctnetlink_init(void)
3172 {
3173         int ret;
3174
3175         pr_info("ctnetlink v%s: registering with nfnetlink.\n", version);
3176         ret = nfnetlink_subsys_register(&ctnl_subsys);
3177         if (ret < 0) {
3178                 pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
3179                 goto err_out;
3180         }
3181
3182         ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
3183         if (ret < 0) {
3184                 pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
3185                 goto err_unreg_subsys;
3186         }
3187
3188         ret = register_pernet_subsys(&ctnetlink_net_ops);
3189         if (ret < 0) {
3190                 pr_err("ctnetlink_init: cannot register pernet operations\n");
3191                 goto err_unreg_exp_subsys;
3192         }
3193 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3194         /* setup interaction between nf_queue and nf_conntrack_netlink. */
3195         RCU_INIT_POINTER(nfq_ct_hook, &ctnetlink_nfqueue_hook);
3196 #endif
3197         return 0;
3198
3199 err_unreg_exp_subsys:
3200         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3201 err_unreg_subsys:
3202         nfnetlink_subsys_unregister(&ctnl_subsys);
3203 err_out:
3204         return ret;
3205 }
3206
3207 static void __exit ctnetlink_exit(void)
3208 {
3209         pr_info("ctnetlink: unregistering from nfnetlink.\n");
3210
3211         unregister_pernet_subsys(&ctnetlink_net_ops);
3212         nfnetlink_subsys_unregister(&ctnl_exp_subsys);
3213         nfnetlink_subsys_unregister(&ctnl_subsys);
3214 #ifdef CONFIG_NETFILTER_NETLINK_QUEUE_CT
3215         RCU_INIT_POINTER(nfq_ct_hook, NULL);
3216 #endif
3217 }
3218
3219 module_init(ctnetlink_init);
3220 module_exit(ctnetlink_exit);