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 = 0;
 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         err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL);
 159         if (err < 0)
 160                 return err;
 161
 162         t = nlmsg_data(n);
 163         protocol = TC_H_MIN(t->tcm_info);
 164         prio = TC_H_MAJ(t->tcm_info);
 165         nprio = prio;
 166         parent = t->tcm_parent;
 167         cl = 0;
 168
 169         if (prio == 0) {
 170                 switch (n->nlmsg_type) {
 171                 case RTM_DELTFILTER:
 172                         if (protocol || t->tcm_handle || tca[TCA_KIND])
 173                                 return -ENOENT;
 174                         break;
 175                 case RTM_NEWTFILTER:
 176                         /* If no priority is provided by the user,
 177                          * we allocate one.
 178                          */
 179                         if (n->nlmsg_flags & NLM_F_CREATE) {
 180                                 prio = TC_H_MAKE(0x80000000U, 0U);
 181                                 break;
 182                         }
 183                         /* fall-through */
 184                 default:
 185                         return -ENOENT;
 186                 }
 187         }
 188
 189         /* Find head of filter chain. */
 190
 191         /* Find link */
 192         dev = __dev_get_by_index(net, t->tcm_ifindex);
 193         if (dev == NULL)
 194                 return -ENODEV;
 195
 196         /* Find qdisc */
 197         if (!parent) {
 198                 q = dev->qdisc;
 199                 parent = q->handle;
 200         } else {
 201                 q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent));
 202                 if (q == NULL)
 203                         return -EINVAL;
 204         }
 205
 206         /* Is it classful? */
 207         cops = q->ops->cl_ops;
 208         if (!cops)
 209                 return -EINVAL;
 210
 211         if (cops->tcf_chain == NULL)
 212                 return -EOPNOTSUPP;
 213
 214         /* Do we search for filter, attached to class? */
 215         if (TC_H_MIN(parent)) {
 216                 cl = cops->get(q, parent);
 217                 if (cl == 0)
 218                         return -ENOENT;
 219         }
 220
 221         /* And the last stroke */
 222         chain = cops->tcf_chain(q, cl);
 223         err = -EINVAL;
 224         if (chain == NULL)
 225                 goto errout;
 226         if (n->nlmsg_type == RTM_DELTFILTER && prio == 0) {
 227                 tfilter_notify_chain(net, skb, n, chain, RTM_DELTFILTER);
 228                 tcf_destroy_chain(chain);
 229                 err = 0;
 230                 goto errout;
 231         }
 232
 233         /* Check the chain for existence of proto-tcf with this priority */
 234         for (back = chain;
 235              (tp = rtnl_dereference(*back)) != NULL;
 236              back = &tp->next) {
 237                 if (tp->prio >= prio) {
 238                         if (tp->prio == prio) {
 239                                 if (!nprio ||
 240                                     (tp->protocol != protocol && protocol))
 241                                         goto errout;
 242                         } else
 243                                 tp = NULL;
 244                         break;
 245                 }
 246         }
 247
 248         if (tp == NULL) {
 249                 /* Proto-tcf does not exist, create new one */
 250
 251                 if (tca[TCA_KIND] == NULL || !protocol)
 252                         goto errout;
 253
 254                 err = -ENOENT;
 255                 if (n->nlmsg_type != RTM_NEWTFILTER ||
 256                     !(n->nlmsg_flags & NLM_F_CREATE))
 257                         goto errout;
 258
 259
 260                 /* Create new proto tcf */
 261
 262                 err = -ENOBUFS;
 263                 tp = kzalloc(sizeof(*tp), GFP_KERNEL);
 264                 if (tp == NULL)
 265                         goto errout;
 266                 err = -ENOENT;
 267                 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND]);
 268                 if (tp_ops == NULL) {
 269 #ifdef CONFIG_MODULES
 270                         struct nlattr *kind = tca[TCA_KIND];
 271                         char name[IFNAMSIZ];
 272
 273                         if (kind != NULL &&
 274                             nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
 275                                 rtnl_unlock();
 276                                 request_module("cls_%s", name);
 277                                 rtnl_lock();
 278                                 tp_ops = tcf_proto_lookup_ops(kind);
 279                                 /* We dropped the RTNL semaphore in order to
 280                                  * perform the module load.  So, even if we
 281                                  * succeeded in loading the module we have to
 282                                  * replay the request.  We indicate this using
 283                                  * -EAGAIN.
 284                                  */
 285                                 if (tp_ops != NULL) {
 286                                         module_put(tp_ops->owner);
 287                                         err = -EAGAIN;
 288                                 }
 289                         }
 290 #endif
 291                         kfree(tp);
 292                         goto errout;
 293                 }
 294                 tp->ops = tp_ops;
 295                 tp->protocol = protocol;
 296                 tp->prio = nprio ? :
 297                                TC_H_MAJ(tcf_auto_prio(rtnl_dereference(*back)));
 298                 tp->q = q;
 299                 tp->classify = tp_ops->classify;
 300                 tp->classid = parent;
 301
 302                 err = tp_ops->init(tp);
 303                 if (err != 0) {
 304                         module_put(tp_ops->owner);
 305                         kfree(tp);
 306                         goto errout;
 307                 }
 308
 309                 tp_created = 1;
 310
 311         } else if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], tp->ops->kind))
 312                 goto errout;
 313
 314         fh = tp->ops->get(tp, t->tcm_handle);
 315
 316         if (fh == 0) {
 317                 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
 318                         struct tcf_proto *next = rtnl_dereference(tp->next);
 319
 320                         RCU_INIT_POINTER(*back, next);
 321
 322                         tfilter_notify(net, skb, n, tp, fh,
 323                                        RTM_DELTFILTER, false);
 324                         tcf_destroy(tp, true);
 325                         err = 0;
 326                         goto errout;
 327                 }
 328
 329                 err = -ENOENT;
 330                 if (n->nlmsg_type != RTM_NEWTFILTER ||
 331                     !(n->nlmsg_flags & NLM_F_CREATE))
 332                         goto errout;
 333         } else {
 334                 switch (n->nlmsg_type) {
 335                 case RTM_NEWTFILTER:
 336                         err = -EEXIST;
 337                         if (n->nlmsg_flags & NLM_F_EXCL) {
 338                                 if (tp_created)
 339                                         tcf_destroy(tp, true);
 340                                 goto errout;
 341                         }
 342                         break;
 343                 case RTM_DELTFILTER:
 344                         err = tp->ops->delete(tp, fh);
 345                         if (err == 0) {
 346                                 struct tcf_proto *next = rtnl_dereference(tp->next);
 347
 348                                 tfilter_notify(net, skb, n, tp, fh,
 349                                                RTM_DELTFILTER, false);
 350                                 if (tcf_destroy(tp, false))
 351                                         RCU_INIT_POINTER(*back, next);
 352                         }
 353                         goto errout;
 354                 case RTM_GETTFILTER:
 355                         err = tfilter_notify(net, skb, n, tp, fh,
 356                                              RTM_NEWTFILTER, true);
 357                         goto errout;
 358                 default:
 359                         err = -EINVAL;
 360                         goto errout;
 361                 }
 362         }
 363
 364         err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
 365                               n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
 366         if (err == 0) {
 367                 if (tp_created) {
 368                         RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
 369                         rcu_assign_pointer(*back, tp);
 370                 }
 371                 tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER, false);
 372         } else {
 373                 if (tp_created)
 374                         tcf_destroy(tp, true);
 375         }
 376
 377 errout:
 378         if (cl)
 379                 cops->put(q, cl);
 380         if (err == -EAGAIN)
 381                 /* Replay the request. */
 382                 goto replay;
 383         return err;
 384 }
 385
 386 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
 387                          struct tcf_proto *tp, unsigned long fh, u32 portid,
 388                          u32 seq, u16 flags, int event)
 389 {
 390         struct tcmsg *tcm;
 391         struct nlmsghdr  *nlh;
 392         unsigned char *b = skb_tail_pointer(skb);
 393
 394         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
 395         if (!nlh)
 396                 goto out_nlmsg_trim;
 397         tcm = nlmsg_data(nlh);
 398         tcm->tcm_family = AF_UNSPEC;
 399         tcm->tcm__pad1 = 0;
 400         tcm->tcm__pad2 = 0;
 401         tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
 402         tcm->tcm_parent = tp->classid;
 403         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
 404         if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
 405                 goto nla_put_failure;
 406         tcm->tcm_handle = fh;
 407         if (RTM_DELTFILTER != event) {
 408                 tcm->tcm_handle = 0;
 409                 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
 410                         goto nla_put_failure;
 411         }
 412         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 413         return skb->len;
 414
 415 out_nlmsg_trim:
 416 nla_put_failure:
 417         nlmsg_trim(skb, b);
 418         return -1;
 419 }
 420
 421 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
 422                           struct nlmsghdr *n, struct tcf_proto *tp,
 423                           unsigned long fh, int event, bool unicast)
 424 {
 425         struct sk_buff *skb;
 426         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
 427
 428         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 429         if (!skb)
 430                 return -ENOBUFS;
 431
 432         if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) {
 433                 kfree_skb(skb);
 434                 return -EINVAL;
 435         }
 436
 437         if (unicast)
 438                 return netlink_unicast(net->rtnl, skb, portid, MSG_DONTWAIT);
 439
 440         return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
 441                               n->nlmsg_flags & NLM_F_ECHO);
 442 }
 443
 444 struct tcf_dump_args {
 445         struct tcf_walker w;
 446         struct sk_buff *skb;
 447         struct netlink_callback *cb;
 448 };
 449
 450 static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
 451                          struct tcf_walker *arg)
 452 {
 453         struct tcf_dump_args *a = (void *)arg;
 454         struct net *net = sock_net(a->skb->sk);
 455
 456         return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid,
 457                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
 458                              RTM_NEWTFILTER);
 459 }
 460
 461 /* called with RTNL */
 462 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 463 {
 464         struct net *net = sock_net(skb->sk);
 465         int t;
 466         int s_t;
 467         struct net_device *dev;
 468         struct Qdisc *q;
 469         struct tcf_proto *tp, __rcu **chain;
 470         struct tcmsg *tcm = nlmsg_data(cb->nlh);
 471         unsigned long cl = 0;
 472         const struct Qdisc_class_ops *cops;
 473         struct tcf_dump_args arg;
 474
 475         if (nlmsg_len(cb->nlh) < sizeof(*tcm))
 476                 return skb->len;
 477         dev = __dev_get_by_index(net, tcm->tcm_ifindex);
 478         if (!dev)
 479                 return skb->len;
 480
 481         if (!tcm->tcm_parent)
 482                 q = dev->qdisc;
 483         else
 484                 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
 485         if (!q)
 486                 goto out;
 487         cops = q->ops->cl_ops;
 488         if (!cops)
 489                 goto errout;
 490         if (cops->tcf_chain == NULL)
 491                 goto errout;
 492         if (TC_H_MIN(tcm->tcm_parent)) {
 493                 cl = cops->get(q, tcm->tcm_parent);
 494                 if (cl == 0)
 495                         goto errout;
 496         }
 497         chain = cops->tcf_chain(q, cl);
 498         if (chain == NULL)
 499                 goto errout;
 500
 501         s_t = cb->args[0];
 502
 503         for (tp = rtnl_dereference(*chain), t = 0;
 504              tp; tp = rtnl_dereference(tp->next), t++) {
 505                 if (t < s_t)
 506                         continue;
 507                 if (TC_H_MAJ(tcm->tcm_info) &&
 508                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
 509                         continue;
 510                 if (TC_H_MIN(tcm->tcm_info) &&
 511                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
 512                         continue;
 513                 if (t > s_t)
 514                         memset(&cb->args[1], 0,
 515                                sizeof(cb->args)-sizeof(cb->args[0]));
 516                 if (cb->args[1] == 0) {
 517                         if (tcf_fill_node(net, skb, tp, 0,
 518                                           NETLINK_CB(cb->skb).portid,
 519                                           cb->nlh->nlmsg_seq, NLM_F_MULTI,
 520                                           RTM_NEWTFILTER) <= 0)
 521                                 break;
 522
 523                         cb->args[1] = 1;
 524                 }
 525                 if (tp->ops->walk == NULL)
 526                         continue;
 527                 arg.w.fn = tcf_node_dump;
 528                 arg.skb = skb;
 529                 arg.cb = cb;
 530                 arg.w.stop = 0;
 531                 arg.w.skip = cb->args[1] - 1;
 532                 arg.w.count = 0;
 533                 tp->ops->walk(tp, &arg.w);
 534                 cb->args[1] = arg.w.count + 1;
 535                 if (arg.w.stop)
 536                         break;
 537         }
 538
 539         cb->args[0] = t;
 540
 541 errout:
 542         if (cl)
 543                 cops->put(q, cl);
 544 out:
 545         return skb->len;
 546 }
 547
 548 void tcf_exts_destroy(struct tcf_exts *exts)
 549 {
 550 #ifdef CONFIG_NET_CLS_ACT
 551         LIST_HEAD(actions);
 552
 553         tcf_exts_to_list(exts, &actions);
 554         tcf_action_destroy(&actions, TCA_ACT_UNBIND);
 555         kfree(exts->actions);
 556         exts->nr_actions = 0;
 557 #endif
 558 }
 559 EXPORT_SYMBOL(tcf_exts_destroy);
 560
 561 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 562                       struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
 563 {
 564 #ifdef CONFIG_NET_CLS_ACT
 565         {
 566                 struct tc_action *act;
 567
 568                 if (exts->police && tb[exts->police]) {
 569                         act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
 570                                                 "police", ovr, TCA_ACT_BIND);
 571                         if (IS_ERR(act))
 572                                 return PTR_ERR(act);
 573
 574                         act->type = exts->type = TCA_OLD_COMPAT;
 575                         exts->actions[0] = act;
 576                         exts->nr_actions = 1;
 577                 } else if (exts->action && tb[exts->action]) {
 578                         LIST_HEAD(actions);
 579                         int err, i = 0;
 580
 581                         err = tcf_action_init(net, tb[exts->action], rate_tlv,
 582                                               NULL, ovr, TCA_ACT_BIND,
 583                                               &actions);
 584                         if (err)
 585                                 return err;
 586                         list_for_each_entry(act, &actions, list)
 587                                 exts->actions[i++] = act;
 588                         exts->nr_actions = i;
 589                 }
 590         }
 591 #else
 592         if ((exts->action && tb[exts->action]) ||
 593             (exts->police && tb[exts->police]))
 594                 return -EOPNOTSUPP;
 595 #endif
 596
 597         return 0;
 598 }
 599 EXPORT_SYMBOL(tcf_exts_validate);
 600
 601 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
 602                      struct tcf_exts *src)
 603 {
 604 #ifdef CONFIG_NET_CLS_ACT
 605         struct tcf_exts old = *dst;
 606
 607         tcf_tree_lock(tp);
 608         dst->nr_actions = src->nr_actions;
 609         dst->actions = src->actions;
 610         dst->type = src->type;
 611         tcf_tree_unlock(tp);
 612
 613         tcf_exts_destroy(&old);
 614 #endif
 615 }
 616 EXPORT_SYMBOL(tcf_exts_change);
 617
 618 #ifdef CONFIG_NET_CLS_ACT
 619 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
 620 {
 621         if (exts->nr_actions == 0)
 622                 return NULL;
 623         else
 624                 return exts->actions[0];
 625 }
 626 #endif
 627
 628 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
 629 {
 630 #ifdef CONFIG_NET_CLS_ACT
 631         struct nlattr *nest;
 632
 633         if (exts->action && exts->nr_actions) {
 634                 /*
 635                  * again for backward compatible mode - we want
 636                  * to work with both old and new modes of entering
 637                  * tc data even if iproute2  was newer - jhs
 638                  */
 639                 if (exts->type != TCA_OLD_COMPAT) {
 640                         LIST_HEAD(actions);
 641
 642                         nest = nla_nest_start(skb, exts->action);
 643                         if (nest == NULL)
 644                                 goto nla_put_failure;
 645
 646                         tcf_exts_to_list(exts, &actions);
 647                         if (tcf_action_dump(skb, &actions, 0, 0) < 0)
 648                                 goto nla_put_failure;
 649                         nla_nest_end(skb, nest);
 650                 } else if (exts->police) {
 651                         struct tc_action *act = tcf_exts_first_act(exts);
 652                         nest = nla_nest_start(skb, exts->police);
 653                         if (nest == NULL || !act)
 654                                 goto nla_put_failure;
 655                         if (tcf_action_dump_old(skb, act, 0, 0) < 0)
 656                                 goto nla_put_failure;
 657                         nla_nest_end(skb, nest);
 658                 }
 659         }
 660         return 0;
 661
 662 nla_put_failure:
 663         nla_nest_cancel(skb, nest);
 664         return -1;
 665 #else
 666         return 0;
 667 #endif
 668 }
 669 EXPORT_SYMBOL(tcf_exts_dump);
 670
 671
 672 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
 673 {
 674 #ifdef CONFIG_NET_CLS_ACT
 675         struct tc_action *a = tcf_exts_first_act(exts);
 676         if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
 677                 return -1;
 678 #endif
 679         return 0;
 680 }
 681 EXPORT_SYMBOL(tcf_exts_dump_stats);
 682
 683 static int __init tc_filter_init(void)
 684 {
 685         rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
 686         rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
 687         rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
 688                       tc_dump_tfilter, NULL);
 689
 690         return 0;
 691 }
 692
 693 subsys_initcall(tc_filter_init);