net/sched/cls_api.c

   1 /*
   2  * net/sched/cls_api.c  Packet classifier API.
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  * Changes:
  12  *
  13  * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
  14  *
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/kmod.h>
  25 #include <linux/err.h>
  26 #include <linux/slab.h>
  27 #include <net/net_namespace.h>
  28 #include <net/sock.h>
  29 #include <net/netlink.h>
  30 #include <net/pkt_sched.h>
  31 #include <net/pkt_cls.h>
  32
  33 /* The list of all installed classifier types */
  34 static LIST_HEAD(tcf_proto_base);
  35
  36 /* Protects list of registered TC modules. It is pure SMP lock. */
  37 static DEFINE_RWLOCK(cls_mod_lock);
  38
  39 /* Find classifier type by string name */
  40
  41 static const struct tcf_proto_ops *tcf_proto_lookup_ops(struct nlattr *kind)
  42 {
  43         const struct tcf_proto_ops *t, *res = NULL;
  44
  45         if (kind) {
  46                 read_lock(&cls_mod_lock);
  47                 list_for_each_entry(t, &tcf_proto_base, head) {
  48                         if (nla_strcmp(kind, t->kind) == 0) {
  49                                 if (try_module_get(t->owner))
  50                                         res = t;
  51                                 break;
  52                         }
  53                 }
  54                 read_unlock(&cls_mod_lock);
  55         }
  56         return res;
  57 }
  58
  59 /* Register(unregister) new classifier type */
  60
  61 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
  62 {
  63         struct tcf_proto_ops *t;
  64         int rc = -EEXIST;
  65
  66         write_lock(&cls_mod_lock);
  67         list_for_each_entry(t, &tcf_proto_base, head)
  68                 if (!strcmp(ops->kind, t->kind))
  69                         goto out;
  70
  71         list_add_tail(&ops->head, &tcf_proto_base);
  72         rc = 0;
  73 out:
  74         write_unlock(&cls_mod_lock);
  75         return rc;
  76 }
  77 EXPORT_SYMBOL(register_tcf_proto_ops);
  78
  79 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
  80 {
  81         struct tcf_proto_ops *t;
  82         int rc = -ENOENT;
  83
  84         /* Wait for outstanding call_rcu()s, if any, from a
  85          * tcf_proto_ops's destroy() handler.
  86          */
  87         rcu_barrier();
  88
  89         write_lock(&cls_mod_lock);
  90         list_for_each_entry(t, &tcf_proto_base, head) {
  91                 if (t == ops) {
  92                         list_del(&t->head);
  93                         rc = 0;
  94                         break;
  95                 }
  96         }
  97         write_unlock(&cls_mod_lock);
  98         return rc;
  99 }
 100 EXPORT_SYMBOL(unregister_tcf_proto_ops);
 101
 102 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
 103                           struct nlmsghdr *n, struct tcf_proto *tp,
 104                           unsigned long fh, int event, bool unicast);
 105
 106 static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
 107                                  struct nlmsghdr *n,
 108                                  struct tcf_proto __rcu **chain, int event)
 109 {
 110         struct tcf_proto __rcu **it_chain;
 111         struct tcf_proto *tp;
 112
 113         for (it_chain = chain; (tp = rtnl_dereference(*it_chain)) != NULL;
 114              it_chain = &tp->next)
 115                 tfilter_notify(net, oskb, n, tp, 0, event, false);
 116 }
 117
 118 /* Select new prio value from the range, managed by kernel. */
 119
 120 static inline u32 tcf_auto_prio(struct tcf_proto *tp)
 121 {
 122         u32 first = TC_H_MAKE(0xC0000000U, 0U);
 123
 124         if (tp)
 125                 first = tp->prio - 1;
 126
 127         return first;
 128 }
 129
 130 /* Add/change/delete/get a filter node */
 131
 132 static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n)
 133 {
 134         struct net *net = sock_net(skb->sk);
 135         struct nlattr *tca[TCA_MAX + 1];
 136         struct tcmsg *t;
 137         u32 protocol;
 138         u32 prio;
 139         u32 nprio;
 140         u32 parent;
 141         struct net_device *dev;
 142         struct Qdisc  *q;
 143         struct tcf_proto __rcu **back;
 144         struct tcf_proto __rcu **chain;
 145         struct tcf_proto *tp;
 146         const struct tcf_proto_ops *tp_ops;
 147         const struct Qdisc_class_ops *cops;
 148         unsigned long cl;
 149         unsigned long fh;
 150         int err;
 151         int tp_created;
 152
 153         if ((n->nlmsg_type != RTM_GETTFILTER) &&
 154             !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
 155                 return -EPERM;
 156
 157 replay:
 158         tp_created = 0;
 159
 160         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
 161         if (err < 0)
 162                 return err;
 163
 164         t = nlmsg_data(n);
 165         protocol = TC_H_MIN(t->tcm_info);
 166         prio = TC_H_MAJ(t->tcm_info);
 167         nprio = prio;
 168         parent = t->tcm_parent;
 169         cl = 0;
 170
 171         if (prio == 0) {
 172                 switch (n->nlmsg_type) {
 173                 case RTM_DELTFILTER:
 174                         if (protocol || t->tcm_handle || tca[TCA_KIND])
 175                                 return -ENOENT;
 176                         break;
 177                 case RTM_NEWTFILTER:
 178                         /* If no priority is provided by the user,
 179                          * we allocate one.
 180                          */
 181                         if (n->nlmsg_flags & NLM_F_CREATE) {
 182                                 prio = TC_H_MAKE(0x80000000U, 0U);
 183                                 break;
 184                         }
 185                         /* fall-through */
 186                 default:
 187                         return -ENOENT;
 188                 }
 189         }
 190
 191         /* Find head of filter chain. */
 192
 193         /* Find link */
 194         dev = __dev_get_by_index(net, t->tcm_ifindex);
 195         if (dev == NULL)
 196                 return -ENODEV;
 197
 198         /* Find qdisc */
 199         if (!parent) {
 200                 q = dev->qdisc;
 201                 parent = q->handle;
 202         } else {
 203                 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
 204                 if (q == NULL)
 205                         return -EINVAL;
 206         }
 207
 208         /* Is it classful? */
 209         cops = q->ops->cl_ops;
 210         if (!cops)
 211                 return -EINVAL;
 212
 213         if (cops->tcf_chain == NULL)
 214                 return -EOPNOTSUPP;
 215
 216         /* Do we search for filter, attached to class? */
 217         if (TC_H_MIN(parent)) {
 218                 cl = cops->get(q, parent);
 219                 if (cl == 0)
 220                         return -ENOENT;
 221         }
 222
 223         /* And the last stroke */
 224         chain = cops->tcf_chain(q, cl);
 225         err = -EINVAL;
 226         if (chain == NULL)
 227                 goto errout;
 228         if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
 229                 tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER);
 230                 tcf_destroy_chain(chain);
 231                 err = 0;
 232                 goto errout;
 233         }
 234
 235         /* Check the chain for existence of proto-tcf with this priority */
 236         for (back = chain;
 237              (tp = rtnl_dereference(*back)) != NULL;
 238              back = &tp->next) {
 239                 if (tp->prio >= prio) {
 240                         if (tp->prio == prio) {
 241                                 if (!nprio ||
 242                                     (tp->protocol != protocol && protocol))
 243                                         goto errout;
 244                         } else
 245                                 tp = NULL;
 246                         break;
 247                 }
 248         }
 249
 250         if (tp == NULL) {
 251                 /* Proto-tcf does not exist, create new one */
 252
 253                 if (tca[TCA_KIND] == NULL || !protocol)
 254                         goto errout;
 255
 256                 err = -ENOENT;
 257                 if (n->nlmsg_type != RTM_NEWTFILTER ||
 258                     !(n->nlmsg_flags & NLM_F_CREATE))
 259                         goto errout;
 260
 261
 262                 /* Create new proto tcf */
 263
 264                 err = -ENOBUFS;
 265                 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
 266                 if (tp == NULL)
 267                         goto errout;
 268                 err = -ENOENT;
 269                 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
 270                 if (tp_ops == NULL) {
 271                         struct nlattr *kind = tca[TCA_KIND];
 272                         char name[IFNAMSIZ];
 273
 274                         if (cl)
 275                                 cops->put(q, cl);
 276                         cl = 0;
 277 #ifdef CONFIG_MODULES
 278                         if (kind != NULL &&
 279                             nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
 280                                 rtnl_unlock();
 281                                 request_module("cls_%s", name);
 282                                 rtnl_lock();
 283                                 tp_ops = tcf_proto_lookup_ops(kind);
 284                                 /* We dropped the RTNL semaphore in order to
 285                                  * perform the module load.  So, even if we
 286                                  * succeeded in loading the module we have to
 287                                  * replay the request.  We indicate this using
 288                                  * -EAGAIN.
 289                                  */
 290                                 if (tp_ops != NULL) {
 291                                         module_put(tp_ops->owner);
 292                                         err = -EAGAIN;
 293                                 }
 294                         }
 295 #endif
 296                         kfree(tp);
 297                         goto errout;
 298                 }
 299                 tp->ops = tp_ops;
 300                 tp->protocol = protocol;
 301                 tp->prio = nprio ? :
 302                                TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
 303                 tp->q = q;
 304                 tp->classify = tp_ops->classify;
 305                 tp->classid = parent;
 306
 307                 err = tp_ops->init(tp);
 308                 if (err != 0) {
 309                         module_put(tp_ops->owner);
 310                         kfree(tp);
 311                         goto errout;
 312                 }
 313
 314                 tp_created = 1;
 315
 316         } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
 317                 goto errout;
 318
 319         fh = tp->ops->get(tp, t->tcm_handle);
 320
 321         if (fh == 0) {
 322                 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
 323                         struct tcf_proto *next = rtnl_dereference(tp->next);
 324
 325                         RCU_INIT_POINTER(*back, next);
 326
 327                         tfilter_notify(net, skb, n, tp, fh,
 328                                        RTM_DELTFILTER, false);
 329                         tcf_destroy(tp, true);
 330                         err = 0;
 331                         goto errout;
 332                 }
 333
 334                 err = -ENOENT;
 335                 if (n->nlmsg_type != RTM_NEWTFILTER ||
 336                     !(n->nlmsg_flags & NLM_F_CREATE))
 337                         goto errout;
 338         } else {
 339                 switch (n->nlmsg_type) {
 340                 case RTM_NEWTFILTER:
 341                         err = -EEXIST;
 342                         if (n->nlmsg_flags & NLM_F_EXCL) {
 343                                 if (tp_created)
 344                                         tcf_destroy(tp, true);
 345                                 goto errout;
 346                         }
 347                         break;
 348                 case RTM_DELTFILTER:
 349                         err = tp->ops->delete(tp, fh);
 350                         if (err == 0) {
 351                                 struct tcf_proto *next = rtnl_dereference(tp->next);
 352
 353                                 tfilter_notify(net, skb, n, tp,
 354                                                t->tcm_handle,
 355                                                RTM_DELTFILTER, false);
 356                                 if (tcf_destroy(tp, false))
 357                                         RCU_INIT_POINTER(*back, next);
 358                         }
 359                         goto errout;
 360                 case RTM_GETTFILTER:
 361                         err = tfilter_notify(net, skb, n, tp, fh,
 362                                              RTM_NEWTFILTER, true);
 363                         goto errout;
 364                 default:
 365                         err = -EINVAL;
 366                         goto errout;
 367                 }
 368         }
 369
 370         err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
 371                               n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
 372         if (err == 0) {
 373                 if (tp_created) {
 374                         RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
 375                         rcu_assign_pointer(*back, tp);
 376                 }
 377                 tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false);
 378         } else {
 379                 if (tp_created)
 380                         tcf_destroy(tp, true);
 381         }
 382
 383 errout:
 384         if (cl)
 385                 cops->put(q, cl);
 386         if (err == -EAGAIN)
 387                 /* Replay the request. */
 388                 goto replay;
 389         return err;
 390 }
 391
 392 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
 393                          struct tcf_proto *tp, unsigned long fh, u32 portid,
 394                          u32 seq, u16 flags, int event)
 395 {
 396         struct tcmsg *tcm;
 397         struct nlmsghdr  *nlh;
 398         unsigned char *b = skb_tail_pointer(skb);
 399
 400         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
 401         if (!nlh)
 402                 goto out_nlmsg_trim;
 403         tcm = nlmsg_data(nlh);
 404         tcm->tcm_family = AF_UNSPEC;
 405         tcm->tcm__pad1 = 0;
 406         tcm->tcm__pad2 = 0;
 407         tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
 408         tcm->tcm_parent = tp->classid;
 409         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
 410         if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
 411                 goto nla_put_failure;
 412         tcm->tcm_handle = fh;
 413         if (RTM_DELTFILTER != event) {
 414                 tcm->tcm_handle = 0;
 415                 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
 416                         goto nla_put_failure;
 417         }
 418         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 419         return skb->len;
 420
 421 out_nlmsg_trim:
 422 nla_put_failure:
 423         nlmsg_trim(skb, b);
 424         return -1;
 425 }
 426
 427 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
 428                           struct nlmsghdr *n, struct tcf_proto *tp,
 429                           unsigned long fh, int event, bool unicast)
 430 {
 431         struct sk_buff *skb;
 432         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
 433
 434         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 435         if (!skb)
 436                 return -ENOBUFS;
 437
 438         if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq,
 439                           n->nlmsg_flags, event) <= 0) {
 440                 kfree_skb(skb);
 441                 return -EINVAL;
 442         }
 443
 444         if (unicast)
 445                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
 446
 447         return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
 448                               n->nlmsg_flags & NLM_F_ECHO);
 449 }
 450
 451 struct tcf_dump_args {
 452         struct tcf_walker w;
 453         struct sk_buff *skb;
 454         struct netlink_callback *cb;
 455 };
 456
 457 static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
 458                          struct tcf_walker *arg)
 459 {
 460         struct tcf_dump_args *a = (void *)arg;
 461         struct net *net = sock_net(a->skb->sk);
 462
 463         return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid,
 464                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
 465                              RTM_NEWTFILTER);
 466 }
 467
 468 /* called with RTNL */
 469 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 470 {
 471         struct net *net = sock_net(skb->sk);
 472         int t;
 473         int s_t;
 474         struct net_device *dev;
 475         struct Qdisc *q;
 476         struct tcf_proto *tp, __rcu **chain;
 477         struct tcmsg *tcm = nlmsg_data(cb->nlh);
 478         unsigned long cl = 0;
 479         const struct Qdisc_class_ops *cops;
 480         struct tcf_dump_args arg;
 481
 482         if (nlmsg_len(cb->nlh) < sizeof(*tcm))
 483                 return skb->len;
 484         dev = __dev_get_by_index(net, tcm->tcm_ifindex);
 485         if (!dev)
 486                 return skb->len;
 487
 488         if (!tcm->tcm_parent)
 489                 q = dev->qdisc;
 490         else
 491                 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
 492         if (!q)
 493                 goto out;
 494         cops = q->ops->cl_ops;
 495         if (!cops)
 496                 goto errout;
 497         if (cops->tcf_chain == NULL)
 498                 goto errout;
 499         if (TC_H_MIN(tcm->tcm_parent)) {
 500                 cl = cops->get(q, tcm->tcm_parent);
 501                 if (cl == 0)
 502                         goto errout;
 503         }
 504         chain = cops->tcf_chain(q, cl);
 505         if (chain == NULL)
 506                 goto errout;
 507
 508         s_t = cb->args[0];
 509
 510         for (tp = rtnl_dereference(*chain), t = 0;
 511              tp; tp = rtnl_dereference(tp->next), t++) {
 512                 if (t < s_t)
 513                         continue;
 514                 if (TC_H_MAJ(tcm->tcm_info) &&
 515                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
 516                         continue;
 517                 if (TC_H_MIN(tcm->tcm_info) &&
 518                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
 519                         continue;
 520                 if (t > s_t)
 521                         memset(&cb->args[1], 0,
 522                                sizeof(cb->args)-sizeof(cb->args[0]));
 523                 if (cb->args[1] == 0) {
 524                         if (tcf_fill_node(net, skb, tp, 0,
 525                                           NETLINK_CB(cb->skb).portid,
 526                                           cb->nlh->nlmsg_seq, NLM_F_MULTI,
 527                                           RTM_NEWTFILTER) <= 0)
 528                                 break;
 529
 530                         cb->args[1] = 1;
 531                 }
 532                 if (tp->ops->walk == NULL)
 533                         continue;
 534                 arg.w.fn = tcf_node_dump;
 535                 arg.skb = skb;
 536                 arg.cb = cb;
 537                 arg.w.stop = 0;
 538                 arg.w.skip = cb->args[1] - 1;
 539                 arg.w.count = 0;
 540                 tp->ops->walk(tp, &arg.w);
 541                 cb->args[1] = arg.w.count + 1;
 542                 if (arg.w.stop)
 543                         break;
 544         }
 545
 546         cb->args[0] = t;
 547
 548 errout:
 549         if (cl)
 550                 cops->put(q, cl);
 551 out:
 552         return skb->len;
 553 }
 554
 555 void tcf_exts_destroy(struct tcf_exts *exts)
 556 {
 557 #ifdef CONFIG_NET_CLS_ACT
 558         LIST_HEAD(actions);
 559
 560         tcf_exts_to_list(exts, &actions);
 561         tcf_action_destroy(&actions, TCA_ACT_UNBIND);
 562         kfree(exts->actions);
 563         exts->nr_actions = 0;
 564 #endif
 565 }
 566 EXPORT_SYMBOL(tcf_exts_destroy);
 567
 568 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 569                       struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
 570 {
 571 #ifdef CONFIG_NET_CLS_ACT
 572         {
 573                 struct tc_action *act;
 574
 575                 if (exts->police && tb[exts->police]) {
 576                         act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
 577                                                 "police", ovr, TCA_ACT_BIND);
 578                         if (IS_ERR(act))
 579                                 return PTR_ERR(act);
 580
 581                         act->type = exts->type = TCA_OLD_COMPAT;
 582                         exts->actions[0] = act;
 583                         exts->nr_actions = 1;
 584                 } else if (exts->action && tb[exts->action]) {
 585                         LIST_HEAD(actions);
 586                         int err, i = 0;
 587
 588                         err = tcf_action_init(net, tb[exts->action], rate_tlv,
 589                                               NULL, ovr, TCA_ACT_BIND,
 590                                               &actions);
 591                         if (err)
 592                                 return err;
 593                         list_for_each_entry(act, &actions, list)
 594                                 exts->actions[i++] = act;
 595                         exts->nr_actions = i;
 596                 }
 597         }
 598 #else
 599         if ((exts->action && tb[exts->action]) ||
 600             (exts->police && tb[exts->police]))
 601                 return -EOPNOTSUPP;
 602 #endif
 603
 604         return 0;
 605 }
 606 EXPORT_SYMBOL(tcf_exts_validate);
 607
 608 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
 609                      struct tcf_exts *src)
 610 {
 611 #ifdef CONFIG_NET_CLS_ACT
 612         struct tcf_exts old = *dst;
 613
 614         tcf_tree_lock(tp);
 615         dst->nr_actions = src->nr_actions;
 616         dst->actions = src->actions;
 617         dst->type = src->type;
 618         tcf_tree_unlock(tp);
 619
 620         tcf_exts_destroy(&old);
 621 #endif
 622 }
 623 EXPORT_SYMBOL(tcf_exts_change);
 624
 625 #ifdef CONFIG_NET_CLS_ACT
 626 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
 627 {
 628         if (exts->nr_actions == 0)
 629                 return NULL;
 630         else
 631                 return exts->actions[0];
 632 }
 633 #endif
 634
 635 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
 636 {
 637 #ifdef CONFIG_NET_CLS_ACT
 638         struct nlattr *nest;
 639
 640         if (exts->action && exts->nr_actions) {
 641                 /*
 642                  * again for backward compatible mode - we want
 643                  * to work with both old and new modes of entering
 644                  * tc data even if iproute2  was newer - jhs
 645                  */
 646                 if (exts->type != TCA_OLD_COMPAT) {
 647                         LIST_HEAD(actions);
 648
 649                         nest = nla_nest_start(skb, exts->action);
 650                         if (nest == NULL)
 651                                 goto nla_put_failure;
 652
 653                         tcf_exts_to_list(exts, &actions);
 654                         if (tcf_action_dump(skb, &actions, 0, 0) < 0)
 655                                 goto nla_put_failure;
 656                         nla_nest_end(skb, nest);
 657                 } else if (exts->police) {
 658                         struct tc_action *act = tcf_exts_first_act(exts);
 659                         nest = nla_nest_start(skb, exts->police);
 660                         if (nest == NULL || !act)
 661                                 goto nla_put_failure;
 662                         if (tcf_action_dump_old(skb, act, 0, 0) < 0)
 663                                 goto nla_put_failure;
 664                         nla_nest_end(skb, nest);
 665                 }
 666         }
 667         return 0;
 668
 669 nla_put_failure:
 670         nla_nest_cancel(skb, nest);
 671         return -1;
 672 #else
 673         return 0;
 674 #endif
 675 }
 676 EXPORT_SYMBOL(tcf_exts_dump);
 677
 678
 679 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
 680 {
 681 #ifdef CONFIG_NET_CLS_ACT
 682         struct tc_action *a = tcf_exts_first_act(exts);
 683         if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
 684                 return -1;
 685 #endif
 686         return 0;
 687 }
 688 EXPORT_SYMBOL(tcf_exts_dump_stats);
 689
 690 static int __init tc_filter_init(void)
 691 {
 692         rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
 693         rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
 694         rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
 695                       tc_dump_tfilter, NULL);
 696
 697         return 0;
 698 }
 699
 700 subsys_initcall(tc_filter_init);