linux/net/netfilter/nf_conntrack_netlink.c
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   1/* Connection tracking via netlink socket. Allows for user space
   2 * protocol helpers and general trouble making from userspace.
   3 *
   4 * (C) 2001 by Jay Schulist <jschlst@samba.org>
   5 * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
   6 * (C) 2003 by Patrick Mchardy <kaber@trash.net>
   7 * (C) 2005-2008 by Pablo Neira Ayuso <pablo@netfilter.org>
   8 *
   9 * Initial connection tracking via netlink development funded and
  10 * generally made possible by Network Robots, Inc. (www.networkrobots.com)
  11 *
  12 * Further development of this code funded by Astaro AG (http://www.astaro.com)
  13 *
  14 * This software may be used and distributed according to the terms
  15 * of the GNU General Public License, incorporated herein by reference.
  16 */
  17
  18#include <linux/init.h>
  19#include <linux/module.h>
  20#include <linux/kernel.h>
  21#include <linux/rculist.h>
  22#include <linux/types.h>
  23#include <linux/timer.h>
  24#include <linux/skbuff.h>
  25#include <linux/errno.h>
  26#include <linux/netlink.h>
  27#include <linux/spinlock.h>
  28#include <linux/interrupt.h>
  29#include <linux/notifier.h>
  30
  31#include <linux/netfilter.h>
  32#include <net/netlink.h>
  33#include <net/netfilter/nf_conntrack.h>
  34#include <net/netfilter/nf_conntrack_core.h>
  35#include <net/netfilter/nf_conntrack_expect.h>
  36#include <net/netfilter/nf_conntrack_helper.h>
  37#include <net/netfilter/nf_conntrack_l3proto.h>
  38#include <net/netfilter/nf_conntrack_l4proto.h>
  39#include <net/netfilter/nf_conntrack_tuple.h>
  40#include <net/netfilter/nf_conntrack_acct.h>
  41#ifdef CONFIG_NF_NAT_NEEDED
  42#include <net/netfilter/nf_nat_core.h>
  43#include <net/netfilter/nf_nat_protocol.h>
  44#endif
  45
  46#include <linux/netfilter/nfnetlink.h>
  47#include <linux/netfilter/nfnetlink_conntrack.h>
  48
  49MODULE_LICENSE("GPL");
  50
  51static char __initdata version[] = "0.93";
  52
  53static inline int
  54ctnetlink_dump_tuples_proto(struct sk_buff *skb,
  55                            const struct nf_conntrack_tuple *tuple,
  56                            struct nf_conntrack_l4proto *l4proto)
  57{
  58        int ret = 0;
  59        struct nlattr *nest_parms;
  60
  61        nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED);
  62        if (!nest_parms)
  63                goto nla_put_failure;
  64        NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum);
  65
  66        if (likely(l4proto->tuple_to_nlattr))
  67                ret = l4proto->tuple_to_nlattr(skb, tuple);
  68
  69        nla_nest_end(skb, nest_parms);
  70
  71        return ret;
  72
  73nla_put_failure:
  74        return -1;
  75}
  76
  77static inline int
  78ctnetlink_dump_tuples_ip(struct sk_buff *skb,
  79                         const struct nf_conntrack_tuple *tuple,
  80                         struct nf_conntrack_l3proto *l3proto)
  81{
  82        int ret = 0;
  83        struct nlattr *nest_parms;
  84
  85        nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED);
  86        if (!nest_parms)
  87                goto nla_put_failure;
  88
  89        if (likely(l3proto->tuple_to_nlattr))
  90                ret = l3proto->tuple_to_nlattr(skb, tuple);
  91
  92        nla_nest_end(skb, nest_parms);
  93
  94        return ret;
  95
  96nla_put_failure:
  97        return -1;
  98}
  99
 100static int
 101ctnetlink_dump_tuples(struct sk_buff *skb,
 102                      const struct nf_conntrack_tuple *tuple)
 103{
 104        int ret;
 105        struct nf_conntrack_l3proto *l3proto;
 106        struct nf_conntrack_l4proto *l4proto;
 107
 108        l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 109        ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto);
 110        nf_ct_l3proto_put(l3proto);
 111
 112        if (unlikely(ret < 0))
 113                return ret;
 114
 115        l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 116        ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
 117        nf_ct_l4proto_put(l4proto);
 118
 119        return ret;
 120}
 121
 122static inline int
 123ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
 124{
 125        NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status));
 126        return 0;
 127
 128nla_put_failure:
 129        return -1;
 130}
 131
 132static inline int
 133ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
 134{
 135        long timeout = (ct->timeout.expires - jiffies) / HZ;
 136
 137        if (timeout < 0)
 138                timeout = 0;
 139
 140        NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout));
 141        return 0;
 142
 143nla_put_failure:
 144        return -1;
 145}
 146
 147static inline int
 148ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 149{
 150        struct nf_conntrack_l4proto *l4proto;
 151        struct nlattr *nest_proto;
 152        int ret;
 153
 154        l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
 155        if (!l4proto->to_nlattr) {
 156                nf_ct_l4proto_put(l4proto);
 157                return 0;
 158        }
 159
 160        nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED);
 161        if (!nest_proto)
 162                goto nla_put_failure;
 163
 164        ret = l4proto->to_nlattr(skb, nest_proto, ct);
 165
 166        nf_ct_l4proto_put(l4proto);
 167
 168        nla_nest_end(skb, nest_proto);
 169
 170        return ret;
 171
 172nla_put_failure:
 173        nf_ct_l4proto_put(l4proto);
 174        return -1;
 175}
 176
 177static inline int
 178ctnetlink_dump_helpinfo(struct sk_buff *skb, const struct nf_conn *ct)
 179{
 180        struct nlattr *nest_helper;
 181        const struct nf_conn_help *help = nfct_help(ct);
 182        struct nf_conntrack_helper *helper;
 183
 184        if (!help)
 185                return 0;
 186
 187        rcu_read_lock();
 188        helper = rcu_dereference(help->helper);
 189        if (!helper)
 190                goto out;
 191
 192        nest_helper = nla_nest_start(skb, CTA_HELP | NLA_F_NESTED);
 193        if (!nest_helper)
 194                goto nla_put_failure;
 195        NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name);
 196
 197        if (helper->to_nlattr)
 198                helper->to_nlattr(skb, ct);
 199
 200        nla_nest_end(skb, nest_helper);
 201out:
 202        rcu_read_unlock();
 203        return 0;
 204
 205nla_put_failure:
 206        rcu_read_unlock();
 207        return -1;
 208}
 209
 210static int
 211ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct,
 212                        enum ip_conntrack_dir dir)
 213{
 214        enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
 215        struct nlattr *nest_count;
 216        const struct nf_conn_counter *acct;
 217
 218        acct = nf_conn_acct_find(ct);
 219        if (!acct)
 220                return 0;
 221
 222        nest_count = nla_nest_start(skb, type | NLA_F_NESTED);
 223        if (!nest_count)
 224                goto nla_put_failure;
 225
 226        NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS,
 227                     cpu_to_be64(acct[dir].packets));
 228        NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES,
 229                     cpu_to_be64(acct[dir].bytes));
 230
 231        nla_nest_end(skb, nest_count);
 232
 233        return 0;
 234
 235nla_put_failure:
 236        return -1;
 237}
 238
 239#ifdef CONFIG_NF_CONNTRACK_MARK
 240static inline int
 241ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
 242{
 243        NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark));
 244        return 0;
 245
 246nla_put_failure:
 247        return -1;
 248}
 249#else
 250#define ctnetlink_dump_mark(a, b) (0)
 251#endif
 252
 253#ifdef CONFIG_NF_CONNTRACK_SECMARK
 254static inline int
 255ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct)
 256{
 257        NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark));
 258        return 0;
 259
 260nla_put_failure:
 261        return -1;
 262}
 263#else
 264#define ctnetlink_dump_secmark(a, b) (0)
 265#endif
 266
 267#define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
 268
 269static inline int
 270ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
 271{
 272        struct nlattr *nest_parms;
 273
 274        if (!(ct->status & IPS_EXPECTED))
 275                return 0;
 276
 277        nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER | NLA_F_NESTED);
 278        if (!nest_parms)
 279                goto nla_put_failure;
 280        if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
 281                goto nla_put_failure;
 282        nla_nest_end(skb, nest_parms);
 283
 284        return 0;
 285
 286nla_put_failure:
 287        return -1;
 288}
 289
 290#ifdef CONFIG_NF_NAT_NEEDED
 291static int
 292dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type)
 293{
 294        struct nlattr *nest_parms;
 295
 296        nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
 297        if (!nest_parms)
 298                goto nla_put_failure;
 299
 300        NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS,
 301                     htonl(natseq->correction_pos));
 302        NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE,
 303                     htonl(natseq->offset_before));
 304        NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER,
 305                     htonl(natseq->offset_after));
 306
 307        nla_nest_end(skb, nest_parms);
 308
 309        return 0;
 310
 311nla_put_failure:
 312        return -1;
 313}
 314
 315static inline int
 316ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct)
 317{
 318        struct nf_nat_seq *natseq;
 319        struct nf_conn_nat *nat = nfct_nat(ct);
 320
 321        if (!(ct->status & IPS_SEQ_ADJUST) || !nat)
 322                return 0;
 323
 324        natseq = &nat->seq[IP_CT_DIR_ORIGINAL];
 325        if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1)
 326                return -1;
 327
 328        natseq = &nat->seq[IP_CT_DIR_REPLY];
 329        if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1)
 330                return -1;
 331
 332        return 0;
 333}
 334#else
 335#define ctnetlink_dump_nat_seq_adj(a, b) (0)
 336#endif
 337
 338static inline int
 339ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
 340{
 341        NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct));
 342        return 0;
 343
 344nla_put_failure:
 345        return -1;
 346}
 347
 348static inline int
 349ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
 350{
 351        NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use)));
 352        return 0;
 353
 354nla_put_failure:
 355        return -1;
 356}
 357
 358#define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
 359
 360static int
 361ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
 362                    int event, int nowait,
 363                    const struct nf_conn *ct)
 364{
 365        struct nlmsghdr *nlh;
 366        struct nfgenmsg *nfmsg;
 367        struct nlattr *nest_parms;
 368        unsigned char *b = skb_tail_pointer(skb);
 369
 370        event |= NFNL_SUBSYS_CTNETLINK << 8;
 371        nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
 372        nfmsg  = NLMSG_DATA(nlh);
 373
 374        nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
 375        nfmsg->nfgen_family = nf_ct_l3num(ct);
 376        nfmsg->version      = NFNETLINK_V0;
 377        nfmsg->res_id       = 0;
 378
 379        nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 380        if (!nest_parms)
 381                goto nla_put_failure;
 382        if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 383                goto nla_put_failure;
 384        nla_nest_end(skb, nest_parms);
 385
 386        nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 387        if (!nest_parms)
 388                goto nla_put_failure;
 389        if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 390                goto nla_put_failure;
 391        nla_nest_end(skb, nest_parms);
 392
 393        if (ctnetlink_dump_status(skb, ct) < 0 ||
 394            ctnetlink_dump_timeout(skb, ct) < 0 ||
 395            ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 396            ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 ||
 397            ctnetlink_dump_protoinfo(skb, ct) < 0 ||
 398            ctnetlink_dump_helpinfo(skb, ct) < 0 ||
 399            ctnetlink_dump_mark(skb, ct) < 0 ||
 400            ctnetlink_dump_secmark(skb, ct) < 0 ||
 401            ctnetlink_dump_id(skb, ct) < 0 ||
 402            ctnetlink_dump_use(skb, ct) < 0 ||
 403            ctnetlink_dump_master(skb, ct) < 0 ||
 404            ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 405                goto nla_put_failure;
 406
 407        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 408        return skb->len;
 409
 410nlmsg_failure:
 411nla_put_failure:
 412        nlmsg_trim(skb, b);
 413        return -1;
 414}
 415
 416#ifdef CONFIG_NF_CONNTRACK_EVENTS
 417static int ctnetlink_conntrack_event(struct notifier_block *this,
 418                                     unsigned long events, void *ptr)
 419{
 420        struct nlmsghdr *nlh;
 421        struct nfgenmsg *nfmsg;
 422        struct nlattr *nest_parms;
 423        struct nf_conn *ct = (struct nf_conn *)ptr;
 424        struct sk_buff *skb;
 425        unsigned int type;
 426        sk_buff_data_t b;
 427        unsigned int flags = 0, group;
 428
 429        /* ignore our fake conntrack entry */
 430        if (ct == &nf_conntrack_untracked)
 431                return NOTIFY_DONE;
 432
 433        if (events & IPCT_DESTROY) {
 434                type = IPCTNL_MSG_CT_DELETE;
 435                group = NFNLGRP_CONNTRACK_DESTROY;
 436        } else  if (events & (IPCT_NEW | IPCT_RELATED)) {
 437                type = IPCTNL_MSG_CT_NEW;
 438                flags = NLM_F_CREATE|NLM_F_EXCL;
 439                group = NFNLGRP_CONNTRACK_NEW;
 440        } else  if (events & (IPCT_STATUS | IPCT_PROTOINFO)) {
 441                type = IPCTNL_MSG_CT_NEW;
 442                group = NFNLGRP_CONNTRACK_UPDATE;
 443        } else
 444                return NOTIFY_DONE;
 445
 446        if (!nfnetlink_has_listeners(group))
 447                return NOTIFY_DONE;
 448
 449        skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
 450        if (!skb)
 451                return NOTIFY_DONE;
 452
 453        b = skb->tail;
 454
 455        type |= NFNL_SUBSYS_CTNETLINK << 8;
 456        nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
 457        nfmsg = NLMSG_DATA(nlh);
 458
 459        nlh->nlmsg_flags    = flags;
 460        nfmsg->nfgen_family = nf_ct_l3num(ct);
 461        nfmsg->version  = NFNETLINK_V0;
 462        nfmsg->res_id   = 0;
 463
 464        nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED);
 465        if (!nest_parms)
 466                goto nla_put_failure;
 467        if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
 468                goto nla_put_failure;
 469        nla_nest_end(skb, nest_parms);
 470
 471        nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED);
 472        if (!nest_parms)
 473                goto nla_put_failure;
 474        if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0)
 475                goto nla_put_failure;
 476        nla_nest_end(skb, nest_parms);
 477
 478        if (ctnetlink_dump_id(skb, ct) < 0)
 479                goto nla_put_failure;
 480
 481        if (ctnetlink_dump_status(skb, ct) < 0)
 482                goto nla_put_failure;
 483
 484        if (events & IPCT_DESTROY) {
 485                if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 ||
 486                    ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0)
 487                        goto nla_put_failure;
 488        } else {
 489                if (ctnetlink_dump_timeout(skb, ct) < 0)
 490                        goto nla_put_failure;
 491
 492                if (events & IPCT_PROTOINFO
 493                    && ctnetlink_dump_protoinfo(skb, ct) < 0)
 494                        goto nla_put_failure;
 495
 496                if ((events & IPCT_HELPER || nfct_help(ct))
 497                    && ctnetlink_dump_helpinfo(skb, ct) < 0)
 498                        goto nla_put_failure;
 499
 500#ifdef CONFIG_NF_CONNTRACK_SECMARK
 501                if ((events & IPCT_SECMARK || ct->secmark)
 502                    && ctnetlink_dump_secmark(skb, ct) < 0)
 503                        goto nla_put_failure;
 504#endif
 505
 506                if (events & IPCT_RELATED &&
 507                    ctnetlink_dump_master(skb, ct) < 0)
 508                        goto nla_put_failure;
 509
 510                if (events & IPCT_NATSEQADJ &&
 511                    ctnetlink_dump_nat_seq_adj(skb, ct) < 0)
 512                        goto nla_put_failure;
 513        }
 514
 515#ifdef CONFIG_NF_CONNTRACK_MARK
 516        if ((events & IPCT_MARK || ct->mark)
 517            && ctnetlink_dump_mark(skb, ct) < 0)
 518                goto nla_put_failure;
 519#endif
 520
 521        nlh->nlmsg_len = skb->tail - b;
 522        nfnetlink_send(skb, 0, group, 0);
 523        return NOTIFY_DONE;
 524
 525nlmsg_failure:
 526nla_put_failure:
 527        kfree_skb(skb);
 528        return NOTIFY_DONE;
 529}
 530#endif /* CONFIG_NF_CONNTRACK_EVENTS */
 531
 532static int ctnetlink_done(struct netlink_callback *cb)
 533{
 534        if (cb->args[1])
 535                nf_ct_put((struct nf_conn *)cb->args[1]);
 536        return 0;
 537}
 538
 539static int
 540ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
 541{
 542        struct nf_conn *ct, *last;
 543        struct nf_conntrack_tuple_hash *h;
 544        struct hlist_node *n;
 545        struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
 546        u_int8_t l3proto = nfmsg->nfgen_family;
 547
 548        rcu_read_lock();
 549        last = (struct nf_conn *)cb->args[1];
 550        for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
 551restart:
 552                hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]],
 553                                         hnode) {
 554                        if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
 555                                continue;
 556                        ct = nf_ct_tuplehash_to_ctrack(h);
 557                        /* Dump entries of a given L3 protocol number.
 558                         * If it is not specified, ie. l3proto == 0,
 559                         * then dump everything. */
 560                        if (l3proto && nf_ct_l3num(ct) != l3proto)
 561                                continue;
 562                        if (cb->args[1]) {
 563                                if (ct != last)
 564                                        continue;
 565                                cb->args[1] = 0;
 566                        }
 567                        if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid,
 568                                                cb->nlh->nlmsg_seq,
 569                                                IPCTNL_MSG_CT_NEW,
 570                                                1, ct) < 0) {
 571                                if (!atomic_inc_not_zero(&ct->ct_general.use))
 572                                        continue;
 573                                cb->args[1] = (unsigned long)ct;
 574                                goto out;
 575                        }
 576
 577                        if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) ==
 578                                                IPCTNL_MSG_CT_GET_CTRZERO) {
 579                                struct nf_conn_counter *acct;
 580
 581                                acct = nf_conn_acct_find(ct);
 582                                if (acct)
 583                                        memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX]));
 584                        }
 585                }
 586                if (cb->args[1]) {
 587                        cb->args[1] = 0;
 588                        goto restart;
 589                }
 590        }
 591out:
 592        rcu_read_unlock();
 593        if (last)
 594                nf_ct_put(last);
 595
 596        return skb->len;
 597}
 598
 599static inline int
 600ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 601{
 602        struct nlattr *tb[CTA_IP_MAX+1];
 603        struct nf_conntrack_l3proto *l3proto;
 604        int ret = 0;
 605
 606        nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 607
 608        l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
 609
 610        if (likely(l3proto->nlattr_to_tuple)) {
 611                ret = nla_validate_nested(attr, CTA_IP_MAX,
 612                                          l3proto->nla_policy);
 613                if (ret == 0)
 614                        ret = l3proto->nlattr_to_tuple(tb, tuple);
 615        }
 616
 617        nf_ct_l3proto_put(l3proto);
 618
 619        return ret;
 620}
 621
 622static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
 623        [CTA_PROTO_NUM] = { .type = NLA_U8 },
 624};
 625
 626static inline int
 627ctnetlink_parse_tuple_proto(struct nlattr *attr,
 628                            struct nf_conntrack_tuple *tuple)
 629{
 630        struct nlattr *tb[CTA_PROTO_MAX+1];
 631        struct nf_conntrack_l4proto *l4proto;
 632        int ret = 0;
 633
 634        ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy);
 635        if (ret < 0)
 636                return ret;
 637
 638        if (!tb[CTA_PROTO_NUM])
 639                return -EINVAL;
 640        tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 641
 642        l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
 643
 644        if (likely(l4proto->nlattr_to_tuple)) {
 645                ret = nla_validate_nested(attr, CTA_PROTO_MAX,
 646                                          l4proto->nla_policy);
 647                if (ret == 0)
 648                        ret = l4proto->nlattr_to_tuple(tb, tuple);
 649        }
 650
 651        nf_ct_l4proto_put(l4proto);
 652
 653        return ret;
 654}
 655
 656static int
 657ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple,
 658                      enum ctattr_tuple type, u_int8_t l3num)
 659{
 660        struct nlattr *tb[CTA_TUPLE_MAX+1];
 661        int err;
 662
 663        memset(tuple, 0, sizeof(*tuple));
 664
 665        nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL);
 666
 667        if (!tb[CTA_TUPLE_IP])
 668                return -EINVAL;
 669
 670        tuple->src.l3num = l3num;
 671
 672        err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple);
 673        if (err < 0)
 674                return err;
 675
 676        if (!tb[CTA_TUPLE_PROTO])
 677                return -EINVAL;
 678
 679        err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple);
 680        if (err < 0)
 681                return err;
 682
 683        /* orig and expect tuples get DIR_ORIGINAL */
 684        if (type == CTA_TUPLE_REPLY)
 685                tuple->dst.dir = IP_CT_DIR_REPLY;
 686        else
 687                tuple->dst.dir = IP_CT_DIR_ORIGINAL;
 688
 689        return 0;
 690}
 691
 692static inline int
 693ctnetlink_parse_help(struct nlattr *attr, char **helper_name)
 694{
 695        struct nlattr *tb[CTA_HELP_MAX+1];
 696
 697        nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL);
 698
 699        if (!tb[CTA_HELP_NAME])
 700                return -EINVAL;
 701
 702        *helper_name = nla_data(tb[CTA_HELP_NAME]);
 703
 704        return 0;
 705}
 706
 707static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
 708        [CTA_STATUS]            = { .type = NLA_U32 },
 709        [CTA_TIMEOUT]           = { .type = NLA_U32 },
 710        [CTA_MARK]              = { .type = NLA_U32 },
 711        [CTA_USE]               = { .type = NLA_U32 },
 712        [CTA_ID]                = { .type = NLA_U32 },
 713};
 714
 715static int
 716ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb,
 717                        struct nlmsghdr *nlh, struct nlattr *cda[])
 718{
 719        struct nf_conntrack_tuple_hash *h;
 720        struct nf_conntrack_tuple tuple;
 721        struct nf_conn *ct;
 722        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 723        u_int8_t u3 = nfmsg->nfgen_family;
 724        int err = 0;
 725
 726        if (cda[CTA_TUPLE_ORIG])
 727                err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 728        else if (cda[CTA_TUPLE_REPLY])
 729                err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 730        else {
 731                /* Flush the whole table */
 732                nf_conntrack_flush(&init_net);
 733                return 0;
 734        }
 735
 736        if (err < 0)
 737                return err;
 738
 739        h = nf_conntrack_find_get(&init_net, &tuple);
 740        if (!h)
 741                return -ENOENT;
 742
 743        ct = nf_ct_tuplehash_to_ctrack(h);
 744
 745        if (cda[CTA_ID]) {
 746                u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID]));
 747                if (id != (u32)(unsigned long)ct) {
 748                        nf_ct_put(ct);
 749                        return -ENOENT;
 750                }
 751        }
 752
 753        nf_ct_kill(ct);
 754        nf_ct_put(ct);
 755
 756        return 0;
 757}
 758
 759static int
 760ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 761                        struct nlmsghdr *nlh, struct nlattr *cda[])
 762{
 763        struct nf_conntrack_tuple_hash *h;
 764        struct nf_conntrack_tuple tuple;
 765        struct nf_conn *ct;
 766        struct sk_buff *skb2 = NULL;
 767        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
 768        u_int8_t u3 = nfmsg->nfgen_family;
 769        int err = 0;
 770
 771        if (nlh->nlmsg_flags & NLM_F_DUMP)
 772                return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table,
 773                                          ctnetlink_done);
 774
 775        if (cda[CTA_TUPLE_ORIG])
 776                err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3);
 777        else if (cda[CTA_TUPLE_REPLY])
 778                err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3);
 779        else
 780                return -EINVAL;
 781
 782        if (err < 0)
 783                return err;
 784
 785        h = nf_conntrack_find_get(&init_net, &tuple);
 786        if (!h)
 787                return -ENOENT;
 788
 789        ct = nf_ct_tuplehash_to_ctrack(h);
 790
 791        err = -ENOMEM;
 792        skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 793        if (!skb2) {
 794                nf_ct_put(ct);
 795                return -ENOMEM;
 796        }
 797
 798        err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq,
 799                                  IPCTNL_MSG_CT_NEW, 1, ct);
 800        nf_ct_put(ct);
 801        if (err <= 0)
 802                goto free;
 803
 804        err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 805        if (err < 0)
 806                goto out;
 807
 808        return 0;
 809
 810free:
 811        kfree_skb(skb2);
 812out:
 813        return err;
 814}
 815
 816#ifdef CONFIG_NF_NAT_NEEDED
 817static int
 818ctnetlink_parse_nat_setup(struct nf_conn *ct,
 819                          enum nf_nat_manip_type manip,
 820                          struct nlattr *attr)
 821{
 822        typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup;
 823
 824        parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook);
 825        if (!parse_nat_setup) {
 826#ifdef CONFIG_MODULES
 827                rcu_read_unlock();
 828                nfnl_unlock();
 829                if (request_module("nf-nat-ipv4") < 0) {
 830                        nfnl_lock();
 831                        rcu_read_lock();
 832                        return -EOPNOTSUPP;
 833                }
 834                nfnl_lock();
 835                rcu_read_lock();
 836                if (nfnetlink_parse_nat_setup_hook)
 837                        return -EAGAIN;
 838#endif
 839                return -EOPNOTSUPP;
 840        }
 841
 842        return parse_nat_setup(ct, manip, attr);
 843}
 844#endif
 845
 846static int
 847ctnetlink_change_status(struct nf_conn *ct, struct nlattr *cda[])
 848{
 849        unsigned long d;
 850        unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
 851        d = ct->status ^ status;
 852
 853        if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
 854                /* unchangeable */
 855                return -EBUSY;
 856
 857        if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
 858                /* SEEN_REPLY bit can only be set */
 859                return -EBUSY;
 860
 861        if (d & IPS_ASSURED && !(status & IPS_ASSURED))
 862                /* ASSURED bit can only be set */
 863                return -EBUSY;
 864
 865        /* Be careful here, modifying NAT bits can screw up things,
 866         * so don't let users modify them directly if they don't pass
 867         * nf_nat_range. */
 868        ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK);
 869        return 0;
 870}
 871
 872static int
 873ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[])
 874{
 875#ifdef CONFIG_NF_NAT_NEEDED
 876        int ret;
 877
 878        if (cda[CTA_NAT_DST]) {
 879                ret = ctnetlink_parse_nat_setup(ct,
 880                                                IP_NAT_MANIP_DST,
 881                                                cda[CTA_NAT_DST]);
 882                if (ret < 0)
 883                        return ret;
 884        }
 885        if (cda[CTA_NAT_SRC]) {
 886                ret = ctnetlink_parse_nat_setup(ct,
 887                                                IP_NAT_MANIP_SRC,
 888                                                cda[CTA_NAT_SRC]);
 889                if (ret < 0)
 890                        return ret;
 891        }
 892        return 0;
 893#else
 894        return -EOPNOTSUPP;
 895#endif
 896}
 897
 898static inline int
 899ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[])
 900{
 901        struct nf_conntrack_helper *helper;
 902        struct nf_conn_help *help = nfct_help(ct);
 903        char *helpname;
 904        int err;
 905
 906        /* don't change helper of sibling connections */
 907        if (ct->master)
 908                return -EBUSY;
 909
 910        err = ctnetlink_parse_help(cda[CTA_HELP], &helpname);
 911        if (err < 0)
 912                return err;
 913
 914        if (!strcmp(helpname, "")) {
 915                if (help && help->helper) {
 916                        /* we had a helper before ... */
 917                        nf_ct_remove_expectations(ct);
 918                        rcu_assign_pointer(help->helper, NULL);
 919                }
 920
 921                return 0;
 922        }
 923
 924        helper = __nf_conntrack_helper_find_byname(helpname);
 925        if (helper == NULL)
 926                return -EOPNOTSUPP;
 927
 928        if (help) {
 929                if (help->helper == helper)
 930                        return 0;
 931                if (help->helper)
 932                        return -EBUSY;
 933                /* need to zero data of old helper */
 934                memset(&help->help, 0, sizeof(help->help));
 935        } else {
 936                help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
 937                if (help == NULL)
 938                        return -ENOMEM;
 939        }
 940
 941        rcu_assign_pointer(help->helper, helper);
 942
 943        return 0;
 944}
 945
 946static inline int
 947ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[])
 948{
 949        u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
 950
 951        if (!del_timer(&ct->timeout))
 952                return -ETIME;
 953
 954        ct->timeout.expires = jiffies + timeout * HZ;
 955        add_timer(&ct->timeout);
 956
 957        return 0;
 958}
 959
 960static inline int
 961ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 962{
 963        struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO];
 964        struct nf_conntrack_l4proto *l4proto;
 965        int err = 0;
 966
 967        nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 968
 969        l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
 970        if (l4proto->from_nlattr)
 971                err = l4proto->from_nlattr(tb, ct);
 972        nf_ct_l4proto_put(l4proto);
 973
 974        return err;
 975}
 976
 977#ifdef CONFIG_NF_NAT_NEEDED
 978static inline int
 979change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr)
 980{
 981        struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
 982
 983        nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL);
 984
 985        if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
 986                return -EINVAL;
 987
 988        natseq->correction_pos =
 989                ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS]));
 990
 991        if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE])
 992                return -EINVAL;
 993
 994        natseq->offset_before =
 995                ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE]));
 996
 997        if (!cda[CTA_NAT_SEQ_OFFSET_AFTER])
 998                return -EINVAL;
 999
1000        natseq->offset_after =
1001                ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER]));
1002
1003        return 0;
1004}
1005
1006static int
1007ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[])
1008{
1009        int ret = 0;
1010        struct nf_conn_nat *nat = nfct_nat(ct);
1011
1012        if (!nat)
1013                return 0;
1014
1015        if (cda[CTA_NAT_SEQ_ADJ_ORIG]) {
1016                ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL],
1017                                         cda[CTA_NAT_SEQ_ADJ_ORIG]);
1018                if (ret < 0)
1019                        return ret;
1020
1021                ct->status |= IPS_SEQ_ADJUST;
1022        }
1023
1024        if (cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1025                ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY],
1026                                         cda[CTA_NAT_SEQ_ADJ_REPLY]);
1027                if (ret < 0)
1028                        return ret;
1029
1030                ct->status |= IPS_SEQ_ADJUST;
1031        }
1032
1033        return 0;
1034}
1035#endif
1036
1037static int
1038ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[])
1039{
1040        int err;
1041
1042        if (cda[CTA_HELP]) {
1043                err = ctnetlink_change_helper(ct, cda);
1044                if (err < 0)
1045                        return err;
1046        }
1047
1048        if (cda[CTA_TIMEOUT]) {
1049                err = ctnetlink_change_timeout(ct, cda);
1050                if (err < 0)
1051                        return err;
1052        }
1053
1054        if (cda[CTA_STATUS]) {
1055                err = ctnetlink_change_status(ct, cda);
1056                if (err < 0)
1057                        return err;
1058        }
1059
1060        if (cda[CTA_PROTOINFO]) {
1061                err = ctnetlink_change_protoinfo(ct, cda);
1062                if (err < 0)
1063                        return err;
1064        }
1065
1066#if defined(CONFIG_NF_CONNTRACK_MARK)
1067        if (cda[CTA_MARK])
1068                ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1069#endif
1070
1071#ifdef CONFIG_NF_NAT_NEEDED
1072        if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) {
1073                err = ctnetlink_change_nat_seq_adj(ct, cda);
1074                if (err < 0)
1075                        return err;
1076        }
1077#endif
1078
1079        return 0;
1080}
1081
1082static int
1083ctnetlink_create_conntrack(struct nlattr *cda[],
1084                           struct nf_conntrack_tuple *otuple,
1085                           struct nf_conntrack_tuple *rtuple,
1086                           struct nf_conn *master_ct)
1087{
1088        struct nf_conn *ct;
1089        int err = -EINVAL;
1090        struct nf_conn_help *help;
1091        struct nf_conntrack_helper *helper;
1092
1093        ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_ATOMIC);
1094        if (ct == NULL || IS_ERR(ct))
1095                return -ENOMEM;
1096
1097        if (!cda[CTA_TIMEOUT])
1098                goto err;
1099        ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
1100
1101        ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
1102        ct->status |= IPS_CONFIRMED;
1103
1104        rcu_read_lock();
1105        helper = __nf_ct_helper_find(rtuple);
1106        if (helper) {
1107                help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
1108                if (help == NULL) {
1109                        rcu_read_unlock();
1110                        err = -ENOMEM;
1111                        goto err;
1112                }
1113                /* not in hash table yet so not strictly necessary */
1114                rcu_assign_pointer(help->helper, helper);
1115        }
1116
1117        if (cda[CTA_STATUS]) {
1118                err = ctnetlink_change_status(ct, cda);
1119                if (err < 0) {
1120                        rcu_read_unlock();
1121                        goto err;
1122                }
1123        }
1124
1125        if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1126                err = ctnetlink_change_nat(ct, cda);
1127                if (err < 0) {
1128                        rcu_read_unlock();
1129                        goto err;
1130                }
1131        }
1132
1133        if (cda[CTA_PROTOINFO]) {
1134                err = ctnetlink_change_protoinfo(ct, cda);
1135                if (err < 0) {
1136                        rcu_read_unlock();
1137                        goto err;
1138                }
1139        }
1140
1141        nf_ct_acct_ext_add(ct, GFP_ATOMIC);
1142
1143#if defined(CONFIG_NF_CONNTRACK_MARK)
1144        if (cda[CTA_MARK])
1145                ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));
1146#endif
1147
1148        /* setup master conntrack: this is a confirmed expectation */
1149        if (master_ct) {
1150                __set_bit(IPS_EXPECTED_BIT, &ct->status);
1151                ct->master = master_ct;
1152        }
1153
1154        add_timer(&ct->timeout);
1155        nf_conntrack_hash_insert(ct);
1156        rcu_read_unlock();
1157
1158        return 0;
1159
1160err:
1161        nf_conntrack_free(ct);
1162        return err;
1163}
1164
1165static int
1166ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
1167                        struct nlmsghdr *nlh, struct nlattr *cda[])
1168{
1169        struct nf_conntrack_tuple otuple, rtuple;
1170        struct nf_conntrack_tuple_hash *h = NULL;
1171        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1172        u_int8_t u3 = nfmsg->nfgen_family;
1173        int err = 0;
1174
1175        if (cda[CTA_TUPLE_ORIG]) {
1176                err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3);
1177                if (err < 0)
1178                        return err;
1179        }
1180
1181        if (cda[CTA_TUPLE_REPLY]) {
1182                err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3);
1183                if (err < 0)
1184                        return err;
1185        }
1186
1187        spin_lock_bh(&nf_conntrack_lock);
1188        if (cda[CTA_TUPLE_ORIG])
1189                h = __nf_conntrack_find(&init_net, &otuple);
1190        else if (cda[CTA_TUPLE_REPLY])
1191                h = __nf_conntrack_find(&init_net, &rtuple);
1192
1193        if (h == NULL) {
1194                struct nf_conntrack_tuple master;
1195                struct nf_conntrack_tuple_hash *master_h = NULL;
1196                struct nf_conn *master_ct = NULL;
1197
1198                if (cda[CTA_TUPLE_MASTER]) {
1199                        err = ctnetlink_parse_tuple(cda,
1200                                                    &master,
1201                                                    CTA_TUPLE_MASTER,
1202                                                    u3);
1203                        if (err < 0)
1204                                goto out_unlock;
1205
1206                        master_h = __nf_conntrack_find(&init_net, &master);
1207                        if (master_h == NULL) {
1208                                err = -ENOENT;
1209                                goto out_unlock;
1210                        }
1211                        master_ct = nf_ct_tuplehash_to_ctrack(master_h);
1212                        atomic_inc(&master_ct->ct_general.use);
1213                }
1214
1215                err = -ENOENT;
1216                if (nlh->nlmsg_flags & NLM_F_CREATE)
1217                        err = ctnetlink_create_conntrack(cda,
1218                                                         &otuple,
1219                                                         &rtuple,
1220                                                         master_ct);
1221                spin_unlock_bh(&nf_conntrack_lock);
1222
1223                if (err < 0 && master_ct)
1224                        nf_ct_put(master_ct);
1225
1226                return err;
1227        }
1228        /* implicit 'else' */
1229
1230        /* We manipulate the conntrack inside the global conntrack table lock,
1231         * so there's no need to increase the refcount */
1232        err = -EEXIST;
1233        if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
1234                /* we only allow nat config for new conntracks */
1235                if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
1236                        err = -EOPNOTSUPP;
1237                        goto out_unlock;
1238                }
1239                /* can't link an existing conntrack to a master */
1240                if (cda[CTA_TUPLE_MASTER]) {
1241                        err = -EOPNOTSUPP;
1242                        goto out_unlock;
1243                }
1244                err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
1245                                                 cda);
1246        }
1247
1248out_unlock:
1249        spin_unlock_bh(&nf_conntrack_lock);
1250        return err;
1251}
1252
1253/***********************************************************************
1254 * EXPECT
1255 ***********************************************************************/
1256
1257static inline int
1258ctnetlink_exp_dump_tuple(struct sk_buff *skb,
1259                         const struct nf_conntrack_tuple *tuple,
1260                         enum ctattr_expect type)
1261{
1262        struct nlattr *nest_parms;
1263
1264        nest_parms = nla_nest_start(skb, type | NLA_F_NESTED);
1265        if (!nest_parms)
1266                goto nla_put_failure;
1267        if (ctnetlink_dump_tuples(skb, tuple) < 0)
1268                goto nla_put_failure;
1269        nla_nest_end(skb, nest_parms);
1270
1271        return 0;
1272
1273nla_put_failure:
1274        return -1;
1275}
1276
1277static inline int
1278ctnetlink_exp_dump_mask(struct sk_buff *skb,
1279                        const struct nf_conntrack_tuple *tuple,
1280                        const struct nf_conntrack_tuple_mask *mask)
1281{
1282        int ret;
1283        struct nf_conntrack_l3proto *l3proto;
1284        struct nf_conntrack_l4proto *l4proto;
1285        struct nf_conntrack_tuple m;
1286        struct nlattr *nest_parms;
1287
1288        memset(&m, 0xFF, sizeof(m));
1289        m.src.u.all = mask->src.u.all;
1290        memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
1291
1292        nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED);
1293        if (!nest_parms)
1294                goto nla_put_failure;
1295
1296        l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
1297        ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
1298        nf_ct_l3proto_put(l3proto);
1299
1300        if (unlikely(ret < 0))
1301                goto nla_put_failure;
1302
1303        l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
1304        ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
1305        nf_ct_l4proto_put(l4proto);
1306        if (unlikely(ret < 0))
1307                goto nla_put_failure;
1308
1309        nla_nest_end(skb, nest_parms);
1310
1311        return 0;
1312
1313nla_put_failure:
1314        return -1;
1315}
1316
1317static int
1318ctnetlink_exp_dump_expect(struct sk_buff *skb,
1319                          const struct nf_conntrack_expect *exp)
1320{
1321        struct nf_conn *master = exp->master;
1322        long timeout = (exp->timeout.expires - jiffies) / HZ;
1323
1324        if (timeout < 0)
1325                timeout = 0;
1326
1327        if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
1328                goto nla_put_failure;
1329        if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
1330                goto nla_put_failure;
1331        if (ctnetlink_exp_dump_tuple(skb,
1332                                 &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
1333                                 CTA_EXPECT_MASTER) < 0)
1334                goto nla_put_failure;
1335
1336        NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout));
1337        NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp));
1338
1339        return 0;
1340
1341nla_put_failure:
1342        return -1;
1343}
1344
1345static int
1346ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq,
1347                    int event,
1348                    int nowait,
1349                    const struct nf_conntrack_expect *exp)
1350{
1351        struct nlmsghdr *nlh;
1352        struct nfgenmsg *nfmsg;
1353        unsigned char *b = skb_tail_pointer(skb);
1354
1355        event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1356        nlh    = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg));
1357        nfmsg  = NLMSG_DATA(nlh);
1358
1359        nlh->nlmsg_flags    = (nowait && pid) ? NLM_F_MULTI : 0;
1360        nfmsg->nfgen_family = exp->tuple.src.l3num;
1361        nfmsg->version      = NFNETLINK_V0;
1362        nfmsg->res_id       = 0;
1363
1364        if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1365                goto nla_put_failure;
1366
1367        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
1368        return skb->len;
1369
1370nlmsg_failure:
1371nla_put_failure:
1372        nlmsg_trim(skb, b);
1373        return -1;
1374}
1375
1376#ifdef CONFIG_NF_CONNTRACK_EVENTS
1377static int ctnetlink_expect_event(struct notifier_block *this,
1378                                  unsigned long events, void *ptr)
1379{
1380        struct nlmsghdr *nlh;
1381        struct nfgenmsg *nfmsg;
1382        struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr;
1383        struct sk_buff *skb;
1384        unsigned int type;
1385        sk_buff_data_t b;
1386        int flags = 0;
1387
1388        if (events & IPEXP_NEW) {
1389                type = IPCTNL_MSG_EXP_NEW;
1390                flags = NLM_F_CREATE|NLM_F_EXCL;
1391        } else
1392                return NOTIFY_DONE;
1393
1394        if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW))
1395                return NOTIFY_DONE;
1396
1397        skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
1398        if (!skb)
1399                return NOTIFY_DONE;
1400
1401        b = skb->tail;
1402
1403        type |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
1404        nlh   = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg));
1405        nfmsg = NLMSG_DATA(nlh);
1406
1407        nlh->nlmsg_flags    = flags;
1408        nfmsg->nfgen_family = exp->tuple.src.l3num;
1409        nfmsg->version      = NFNETLINK_V0;
1410        nfmsg->res_id       = 0;
1411
1412        if (ctnetlink_exp_dump_expect(skb, exp) < 0)
1413                goto nla_put_failure;
1414
1415        nlh->nlmsg_len = skb->tail - b;
1416        nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0);
1417        return NOTIFY_DONE;
1418
1419nlmsg_failure:
1420nla_put_failure:
1421        kfree_skb(skb);
1422        return NOTIFY_DONE;
1423}
1424#endif
1425static int ctnetlink_exp_done(struct netlink_callback *cb)
1426{
1427        if (cb->args[1])
1428                nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
1429        return 0;
1430}
1431
1432static int
1433ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
1434{
1435        struct net *net = &init_net;
1436        struct nf_conntrack_expect *exp, *last;
1437        struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh);
1438        struct hlist_node *n;
1439        u_int8_t l3proto = nfmsg->nfgen_family;
1440
1441        rcu_read_lock();
1442        last = (struct nf_conntrack_expect *)cb->args[1];
1443        for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
1444restart:
1445                hlist_for_each_entry(exp, n, &net->ct.expect_hash[cb->args[0]],
1446                                     hnode) {
1447                        if (l3proto && exp->tuple.src.l3num != l3proto)
1448                                continue;
1449                        if (cb->args[1]) {
1450                                if (exp != last)
1451                                        continue;
1452                                cb->args[1] = 0;
1453                        }
1454                        if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).pid,
1455                                                    cb->nlh->nlmsg_seq,
1456                                                    IPCTNL_MSG_EXP_NEW,
1457                                                    1, exp) < 0) {
1458                                if (!atomic_inc_not_zero(&exp->use))
1459                                        continue;
1460                                cb->args[1] = (unsigned long)exp;
1461                                goto out;
1462                        }
1463                }
1464                if (cb->args[1]) {
1465                        cb->args[1] = 0;
1466                        goto restart;
1467                }
1468        }
1469out:
1470        rcu_read_unlock();
1471        if (last)
1472                nf_ct_expect_put(last);
1473
1474        return skb->len;
1475}
1476
1477static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
1478        [CTA_EXPECT_TIMEOUT]    = { .type = NLA_U32 },
1479        [CTA_EXPECT_ID]         = { .type = NLA_U32 },
1480};
1481
1482static int
1483ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
1484                     struct nlmsghdr *nlh, struct nlattr *cda[])
1485{
1486        struct nf_conntrack_tuple tuple;
1487        struct nf_conntrack_expect *exp;
1488        struct sk_buff *skb2;
1489        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1490        u_int8_t u3 = nfmsg->nfgen_family;
1491        int err = 0;
1492
1493        if (nlh->nlmsg_flags & NLM_F_DUMP) {
1494                return netlink_dump_start(ctnl, skb, nlh,
1495                                          ctnetlink_exp_dump_table,
1496                                          ctnetlink_exp_done);
1497        }
1498
1499        if (cda[CTA_EXPECT_MASTER])
1500                err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3);
1501        else
1502                return -EINVAL;
1503
1504        if (err < 0)
1505                return err;
1506
1507        exp = nf_ct_expect_find_get(&init_net, &tuple);
1508        if (!exp)
1509                return -ENOENT;
1510
1511        if (cda[CTA_EXPECT_ID]) {
1512                __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1513                if (ntohl(id) != (u32)(unsigned long)exp) {
1514                        nf_ct_expect_put(exp);
1515                        return -ENOENT;
1516                }
1517        }
1518
1519        err = -ENOMEM;
1520        skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
1521        if (!skb2)
1522                goto out;
1523
1524        err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid,
1525                                      nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
1526                                      1, exp);
1527        if (err <= 0)
1528                goto free;
1529
1530        nf_ct_expect_put(exp);
1531
1532        return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
1533
1534free:
1535        kfree_skb(skb2);
1536out:
1537        nf_ct_expect_put(exp);
1538        return err;
1539}
1540
1541static int
1542ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb,
1543                     struct nlmsghdr *nlh, struct nlattr *cda[])
1544{
1545        struct nf_conntrack_expect *exp;
1546        struct nf_conntrack_tuple tuple;
1547        struct nf_conntrack_helper *h;
1548        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1549        struct hlist_node *n, *next;
1550        u_int8_t u3 = nfmsg->nfgen_family;
1551        unsigned int i;
1552        int err;
1553
1554        if (cda[CTA_EXPECT_TUPLE]) {
1555                /* delete a single expect by tuple */
1556                err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1557                if (err < 0)
1558                        return err;
1559
1560                /* bump usage count to 2 */
1561                exp = nf_ct_expect_find_get(&init_net, &tuple);
1562                if (!exp)
1563                        return -ENOENT;
1564
1565                if (cda[CTA_EXPECT_ID]) {
1566                        __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
1567                        if (ntohl(id) != (u32)(unsigned long)exp) {
1568                                nf_ct_expect_put(exp);
1569                                return -ENOENT;
1570                        }
1571                }
1572
1573                /* after list removal, usage count == 1 */
1574                nf_ct_unexpect_related(exp);
1575                /* have to put what we 'get' above.
1576                 * after this line usage count == 0 */
1577                nf_ct_expect_put(exp);
1578        } else if (cda[CTA_EXPECT_HELP_NAME]) {
1579                char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
1580                struct nf_conn_help *m_help;
1581
1582                /* delete all expectations for this helper */
1583                spin_lock_bh(&nf_conntrack_lock);
1584                h = __nf_conntrack_helper_find_byname(name);
1585                if (!h) {
1586                        spin_unlock_bh(&nf_conntrack_lock);
1587                        return -EOPNOTSUPP;
1588                }
1589                for (i = 0; i < nf_ct_expect_hsize; i++) {
1590                        hlist_for_each_entry_safe(exp, n, next,
1591                                                  &init_net.ct.expect_hash[i],
1592                                                  hnode) {
1593                                m_help = nfct_help(exp->master);
1594                                if (m_help->helper == h
1595                                    && del_timer(&exp->timeout)) {
1596                                        nf_ct_unlink_expect(exp);
1597                                        nf_ct_expect_put(exp);
1598                                }
1599                        }
1600                }
1601                spin_unlock_bh(&nf_conntrack_lock);
1602        } else {
1603                /* This basically means we have to flush everything*/
1604                spin_lock_bh(&nf_conntrack_lock);
1605                for (i = 0; i < nf_ct_expect_hsize; i++) {
1606                        hlist_for_each_entry_safe(exp, n, next,
1607                                                  &init_net.ct.expect_hash[i],
1608                                                  hnode) {
1609                                if (del_timer(&exp->timeout)) {
1610                                        nf_ct_unlink_expect(exp);
1611                                        nf_ct_expect_put(exp);
1612                                }
1613                        }
1614                }
1615                spin_unlock_bh(&nf_conntrack_lock);
1616        }
1617
1618        return 0;
1619}
1620static int
1621ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[])
1622{
1623        return -EOPNOTSUPP;
1624}
1625
1626static int
1627ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3)
1628{
1629        struct nf_conntrack_tuple tuple, mask, master_tuple;
1630        struct nf_conntrack_tuple_hash *h = NULL;
1631        struct nf_conntrack_expect *exp;
1632        struct nf_conn *ct;
1633        struct nf_conn_help *help;
1634        int err = 0;
1635
1636        /* caller guarantees that those three CTA_EXPECT_* exist */
1637        err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1638        if (err < 0)
1639                return err;
1640        err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3);
1641        if (err < 0)
1642                return err;
1643        err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3);
1644        if (err < 0)
1645                return err;
1646
1647        /* Look for master conntrack of this expectation */
1648        h = nf_conntrack_find_get(&init_net, &master_tuple);
1649        if (!h)
1650                return -ENOENT;
1651        ct = nf_ct_tuplehash_to_ctrack(h);
1652        help = nfct_help(ct);
1653
1654        if (!help || !help->helper) {
1655                /* such conntrack hasn't got any helper, abort */
1656                err = -EINVAL;
1657                goto out;
1658        }
1659
1660        exp = nf_ct_expect_alloc(ct);
1661        if (!exp) {
1662                err = -ENOMEM;
1663                goto out;
1664        }
1665
1666        exp->expectfn = NULL;
1667        exp->flags = 0;
1668        exp->master = ct;
1669        exp->helper = NULL;
1670        memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
1671        memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
1672        exp->mask.src.u.all = mask.src.u.all;
1673
1674        err = nf_ct_expect_related(exp);
1675        nf_ct_expect_put(exp);
1676
1677out:
1678        nf_ct_put(nf_ct_tuplehash_to_ctrack(h));
1679        return err;
1680}
1681
1682static int
1683ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb,
1684                     struct nlmsghdr *nlh, struct nlattr *cda[])
1685{
1686        struct nf_conntrack_tuple tuple;
1687        struct nf_conntrack_expect *exp;
1688        struct nfgenmsg *nfmsg = NLMSG_DATA(nlh);
1689        u_int8_t u3 = nfmsg->nfgen_family;
1690        int err = 0;
1691
1692        if (!cda[CTA_EXPECT_TUPLE]
1693            || !cda[CTA_EXPECT_MASK]
1694            || !cda[CTA_EXPECT_MASTER])
1695                return -EINVAL;
1696
1697        err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3);
1698        if (err < 0)
1699                return err;
1700
1701        spin_lock_bh(&nf_conntrack_lock);
1702        exp = __nf_ct_expect_find(&init_net, &tuple);
1703
1704        if (!exp) {
1705                spin_unlock_bh(&nf_conntrack_lock);
1706                err = -ENOENT;
1707                if (nlh->nlmsg_flags & NLM_F_CREATE)
1708                        err = ctnetlink_create_expect(cda, u3);
1709                return err;
1710        }
1711
1712        err = -EEXIST;
1713        if (!(nlh->nlmsg_flags & NLM_F_EXCL))
1714                err = ctnetlink_change_expect(exp, cda);
1715        spin_unlock_bh(&nf_conntrack_lock);
1716
1717        return err;
1718}
1719
1720#ifdef CONFIG_NF_CONNTRACK_EVENTS
1721static struct notifier_block ctnl_notifier = {
1722        .notifier_call  = ctnetlink_conntrack_event,
1723};
1724
1725static struct notifier_block ctnl_notifier_exp = {
1726        .notifier_call  = ctnetlink_expect_event,
1727};
1728#endif
1729
1730static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
1731        [IPCTNL_MSG_CT_NEW]             = { .call = ctnetlink_new_conntrack,
1732                                            .attr_count = CTA_MAX,
1733                                            .policy = ct_nla_policy },
1734        [IPCTNL_MSG_CT_GET]             = { .call = ctnetlink_get_conntrack,
1735                                            .attr_count = CTA_MAX,
1736                                            .policy = ct_nla_policy },
1737        [IPCTNL_MSG_CT_DELETE]          = { .call = ctnetlink_del_conntrack,
1738                                            .attr_count = CTA_MAX,
1739                                            .policy = ct_nla_policy },
1740        [IPCTNL_MSG_CT_GET_CTRZERO]     = { .call = ctnetlink_get_conntrack,
1741                                            .attr_count = CTA_MAX,
1742                                            .policy = ct_nla_policy },
1743};
1744
1745static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
1746        [IPCTNL_MSG_EXP_GET]            = { .call = ctnetlink_get_expect,
1747                                            .attr_count = CTA_EXPECT_MAX,
1748                                            .policy = exp_nla_policy },
1749        [IPCTNL_MSG_EXP_NEW]            = { .call = ctnetlink_new_expect,
1750                                            .attr_count = CTA_EXPECT_MAX,
1751                                            .policy = exp_nla_policy },
1752        [IPCTNL_MSG_EXP_DELETE]         = { .call = ctnetlink_del_expect,
1753                                            .attr_count = CTA_EXPECT_MAX,
1754                                            .policy = exp_nla_policy },
1755};
1756
1757static const struct nfnetlink_subsystem ctnl_subsys = {
1758        .name                           = "conntrack",
1759        .subsys_id                      = NFNL_SUBSYS_CTNETLINK,
1760        .cb_count                       = IPCTNL_MSG_MAX,
1761        .cb                             = ctnl_cb,
1762};
1763
1764static const struct nfnetlink_subsystem ctnl_exp_subsys = {
1765        .name                           = "conntrack_expect",
1766        .subsys_id                      = NFNL_SUBSYS_CTNETLINK_EXP,
1767        .cb_count                       = IPCTNL_MSG_EXP_MAX,
1768        .cb                             = ctnl_exp_cb,
1769};
1770
1771MODULE_ALIAS("ip_conntrack_netlink");
1772MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
1773MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
1774
1775static int __init ctnetlink_init(void)
1776{
1777        int ret;
1778
1779        printk("ctnetlink v%s: registering with nfnetlink.\n", version);
1780        ret = nfnetlink_subsys_register(&ctnl_subsys);
1781        if (ret < 0) {
1782                printk("ctnetlink_init: cannot register with nfnetlink.\n");
1783                goto err_out;
1784        }
1785
1786        ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
1787        if (ret < 0) {
1788                printk("ctnetlink_init: cannot register exp with nfnetlink.\n");
1789                goto err_unreg_subsys;
1790        }
1791
1792#ifdef CONFIG_NF_CONNTRACK_EVENTS
1793        ret = nf_conntrack_register_notifier(&ctnl_notifier);
1794        if (ret < 0) {
1795                printk("ctnetlink_init: cannot register notifier.\n");
1796                goto err_unreg_exp_subsys;
1797        }
1798
1799        ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp);
1800        if (ret < 0) {
1801                printk("ctnetlink_init: cannot expect register notifier.\n");
1802                goto err_unreg_notifier;
1803        }
1804#endif
1805
1806        return 0;
1807
1808#ifdef CONFIG_NF_CONNTRACK_EVENTS
1809err_unreg_notifier:
1810        nf_conntrack_unregister_notifier(&ctnl_notifier);
1811err_unreg_exp_subsys:
1812        nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1813#endif
1814err_unreg_subsys:
1815        nfnetlink_subsys_unregister(&ctnl_subsys);
1816err_out:
1817        return ret;
1818}
1819
1820static void __exit ctnetlink_exit(void)
1821{
1822        printk("ctnetlink: unregistering from nfnetlink.\n");
1823
1824#ifdef CONFIG_NF_CONNTRACK_EVENTS
1825        nf_ct_expect_unregister_notifier(&ctnl_notifier_exp);
1826        nf_conntrack_unregister_notifier(&ctnl_notifier);
1827#endif
1828
1829        nfnetlink_subsys_unregister(&ctnl_exp_subsys);
1830        nfnetlink_subsys_unregister(&ctnl_subsys);
1831        return;
1832}
1833
1834module_init(ctnetlink_init);
1835module_exit(ctnetlink_exit);
1836