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);
 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);
 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, RTM_DELTFILTER);
 323                         tcf_destroy(tp, true);
 324                         err = 0;
 325                         goto errout;
 326                 }
 327
 328                 err = -ENOENT;
 329                 if (n->nlmsg_type != RTM_NEWTFILTER ||
 330                     !(n->nlmsg_flags & NLM_F_CREATE))
 331                         goto errout;
 332         } else {
 333                 switch (n->nlmsg_type) {
 334                 case RTM_NEWTFILTER:
 335                         err = -EEXIST;
 336                         if (n->nlmsg_flags & NLM_F_EXCL) {
 337                                 if (tp_created)
 338                                         tcf_destroy(tp, true);
 339                                 goto errout;
 340                         }
 341                         break;
 342                 case RTM_DELTFILTER:
 343                         err = tp->ops->delete(tp, fh);
 344                         if (err == 0) {
 345                                 struct tcf_proto *next = rtnl_dereference(tp->next);
 346
 347                                 tfilter_notify(net, skb, n, tp, fh,
 348                                                RTM_DELTFILTER);
 349                                 if (tcf_destroy(tp, false))
 350                                         RCU_INIT_POINTER(*back, next);
 351                         }
 352                         goto errout;
 353                 case RTM_GETTFILTER:
 354                         err = tfilter_notify(net, skb, n, tp, fh,
 355                                              RTM_NEWTFILTER);
 356                         goto errout;
 357                 default:
 358                         err = -EINVAL;
 359                         goto errout;
 360                 }
 361         }
 362
 363         err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
 364                               n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE);
 365         if (err == 0) {
 366                 if (tp_created) {
 367                         RCU_INIT_POINTER(tp->next, rtnl_dereference(*back));
 368                         rcu_assign_pointer(*back, tp);
 369                 }
 370                 tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
 371         } else {
 372                 if (tp_created)
 373                         tcf_destroy(tp, true);
 374         }
 375
 376 errout:
 377         if (cl)
 378                 cops->put(q, cl);
 379         if (err == -EAGAIN)
 380                 /* Replay the request. */
 381                 goto replay;
 382         return err;
 383 }
 384
 385 static int tcf_fill_node(struct net *net, struct sk_buff *skb,
 386                          struct tcf_proto *tp, unsigned long fh, u32 portid,
 387                          u32 seq, u16 flags, int event)
 388 {
 389         struct tcmsg *tcm;
 390         struct nlmsghdr  *nlh;
 391         unsigned char *b = skb_tail_pointer(skb);
 392
 393         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
 394         if (!nlh)
 395                 goto out_nlmsg_trim;
 396         tcm = nlmsg_data(nlh);
 397         tcm->tcm_family = AF_UNSPEC;
 398         tcm->tcm__pad1 = 0;
 399         tcm->tcm__pad2 = 0;
 400         tcm->tcm_ifindex = qdisc_dev(tp->q)->ifindex;
 401         tcm->tcm_parent = tp->classid;
 402         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
 403         if (nla_put_string(skb, TCA_KIND, tp->ops->kind))
 404                 goto nla_put_failure;
 405         tcm->tcm_handle = fh;
 406         if (RTM_DELTFILTER != event) {
 407                 tcm->tcm_handle = 0;
 408                 if (tp->ops->dump && tp->ops->dump(net, tp, fh, skb, tcm) < 0)
 409                         goto nla_put_failure;
 410         }
 411         nlh->nlmsg_len = skb_tail_pointer(skb) - b;
 412         return skb->len;
 413
 414 out_nlmsg_trim:
 415 nla_put_failure:
 416         nlmsg_trim(skb, b);
 417         return -1;
 418 }
 419
 420 static int tfilter_notify(struct net *net, struct sk_buff *oskb,
 421                           struct nlmsghdr *n, struct tcf_proto *tp,
 422                           unsigned long fh, int event)
 423 {
 424         struct sk_buff *skb;
 425         u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
 426
 427         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 428         if (!skb)
 429                 return -ENOBUFS;
 430
 431         if (tcf_fill_node(net, skb, tp, fh, portid, n->nlmsg_seq, 0, event) <= 0) {
 432                 kfree_skb(skb);
 433                 return -EINVAL;
 434         }
 435
 436         return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
 437                               n->nlmsg_flags & NLM_F_ECHO);
 438 }
 439
 440 struct tcf_dump_args {
 441         struct tcf_walker w;
 442         struct sk_buff *skb;
 443         struct netlink_callback *cb;
 444 };
 445
 446 static int tcf_node_dump(struct tcf_proto *tp, unsigned long n,
 447                          struct tcf_walker *arg)
 448 {
 449         struct tcf_dump_args *a = (void *)arg;
 450         struct net *net = sock_net(a->skb->sk);
 451
 452         return tcf_fill_node(net, a->skb, tp, n, NETLINK_CB(a->cb->skb).portid,
 453                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
 454                              RTM_NEWTFILTER);
 455 }
 456
 457 /* called with RTNL */
 458 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 459 {
 460         struct net *net = sock_net(skb->sk);
 461         int t;
 462         int s_t;
 463         struct net_device *dev;
 464         struct Qdisc *q;
 465         struct tcf_proto *tp, __rcu **chain;
 466         struct tcmsg *tcm = nlmsg_data(cb->nlh);
 467         unsigned long cl = 0;
 468         const struct Qdisc_class_ops *cops;
 469         struct tcf_dump_args arg;
 470
 471         if (nlmsg_len(cb->nlh) < sizeof(*tcm))
 472                 return skb->len;
 473         dev = __dev_get_by_index(net, tcm->tcm_ifindex);
 474         if (!dev)
 475                 return skb->len;
 476
 477         if (!tcm->tcm_parent)
 478                 q = dev->qdisc;
 479         else
 480                 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
 481         if (!q)
 482                 goto out;
 483         cops = q->ops->cl_ops;
 484         if (!cops)
 485                 goto errout;
 486         if (cops->tcf_chain == NULL)
 487                 goto errout;
 488         if (TC_H_MIN(tcm->tcm_parent)) {
 489                 cl = cops->get(q, tcm->tcm_parent);
 490                 if (cl == 0)
 491                         goto errout;
 492         }
 493         chain = cops->tcf_chain(q, cl);
 494         if (chain == NULL)
 495                 goto errout;
 496
 497         s_t = cb->args[0];
 498
 499         for (tp = rtnl_dereference(*chain), t = 0;
 500              tp; tp = rtnl_dereference(tp->next), t++) {
 501                 if (t < s_t)
 502                         continue;
 503                 if (TC_H_MAJ(tcm->tcm_info) &&
 504                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
 505                         continue;
 506                 if (TC_H_MIN(tcm->tcm_info) &&
 507                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
 508                         continue;
 509                 if (t > s_t)
 510                         memset(&cb->args[1], 0,
 511                                sizeof(cb->args)-sizeof(cb->args[0]));
 512                 if (cb->args[1] == 0) {
 513                         if (tcf_fill_node(net, skb, tp, 0,
 514                                           NETLINK_CB(cb->skb).portid,
 515                                           cb->nlh->nlmsg_seq, NLM_F_MULTI,
 516                                           RTM_NEWTFILTER) <= 0)
 517                                 break;
 518
 519                         cb->args[1] = 1;
 520                 }
 521                 if (tp->ops->walk == NULL)
 522                         continue;
 523                 arg.w.fn = tcf_node_dump;
 524                 arg.skb = skb;
 525                 arg.cb = cb;
 526                 arg.w.stop = 0;
 527                 arg.w.skip = cb->args[1] - 1;
 528                 arg.w.count = 0;
 529                 tp->ops->walk(tp, &arg.w);
 530                 cb->args[1] = arg.w.count + 1;
 531                 if (arg.w.stop)
 532                         break;
 533         }
 534
 535         cb->args[0] = t;
 536
 537 errout:
 538         if (cl)
 539                 cops->put(q, cl);
 540 out:
 541         return skb->len;
 542 }
 543
 544 void tcf_exts_destroy(struct tcf_exts *exts)
 545 {
 546 #ifdef CONFIG_NET_CLS_ACT
 547         LIST_HEAD(actions);
 548
 549         tcf_exts_to_list(exts, &actions);
 550         tcf_action_destroy(&actions, TCA_ACT_UNBIND);
 551         kfree(exts->actions);
 552         exts->nr_actions = 0;
 553 #endif
 554 }
 555 EXPORT_SYMBOL(tcf_exts_destroy);
 556
 557 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 558                       struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr)
 559 {
 560 #ifdef CONFIG_NET_CLS_ACT
 561         {
 562                 struct tc_action *act;
 563
 564                 if (exts->police && tb[exts->police]) {
 565                         act = tcf_action_init_1(net, tb[exts->police], rate_tlv,
 566                                                 "police", ovr, TCA_ACT_BIND);
 567                         if (IS_ERR(act))
 568                                 return PTR_ERR(act);
 569
 570                         act->type = exts->type = TCA_OLD_COMPAT;
 571                         exts->actions[0] = act;
 572                         exts->nr_actions = 1;
 573                 } else if (exts->action && tb[exts->action]) {
 574                         LIST_HEAD(actions);
 575                         int err, i = 0;
 576
 577                         err = tcf_action_init(net, tb[exts->action], rate_tlv,
 578                                               NULL, ovr, TCA_ACT_BIND,
 579                                               &actions);
 580                         if (err)
 581                                 return err;
 582                         list_for_each_entry(act, &actions, list)
 583                                 exts->actions[i++] = act;
 584                         exts->nr_actions = i;
 585                 }
 586         }
 587 #else
 588         if ((exts->action && tb[exts->action]) ||
 589             (exts->police && tb[exts->police]))
 590                 return -EOPNOTSUPP;
 591 #endif
 592
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(tcf_exts_validate);
 596
 597 void tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
 598                      struct tcf_exts *src)
 599 {
 600 #ifdef CONFIG_NET_CLS_ACT
 601         struct tcf_exts old = *dst;
 602
 603         tcf_tree_lock(tp);
 604         dst->nr_actions = src->nr_actions;
 605         dst->actions = src->actions;
 606         dst->type = src->type;
 607         tcf_tree_unlock(tp);
 608
 609         tcf_exts_destroy(&old);
 610 #endif
 611 }
 612 EXPORT_SYMBOL(tcf_exts_change);
 613
 614 #ifdef CONFIG_NET_CLS_ACT
 615 static struct tc_action *tcf_exts_first_act(struct tcf_exts *exts)
 616 {
 617         if (exts->nr_actions == 0)
 618                 return NULL;
 619         else
 620                 return exts->actions[0];
 621 }
 622 #endif
 623
 624 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts)
 625 {
 626 #ifdef CONFIG_NET_CLS_ACT
 627         struct nlattr *nest;
 628
 629         if (exts->action && exts->nr_actions) {
 630                 /*
 631                  * again for backward compatible mode - we want
 632                  * to work with both old and new modes of entering
 633                  * tc data even if iproute2  was newer - jhs
 634                  */
 635                 if (exts->type != TCA_OLD_COMPAT) {
 636                         LIST_HEAD(actions);
 637
 638                         nest = nla_nest_start(skb, exts->action);
 639                         if (nest == NULL)
 640                                 goto nla_put_failure;
 641
 642                         tcf_exts_to_list(exts, &actions);
 643                         if (tcf_action_dump(skb, &actions, 0, 0) < 0)
 644                                 goto nla_put_failure;
 645                         nla_nest_end(skb, nest);
 646                 } else if (exts->police) {
 647                         struct tc_action *act = tcf_exts_first_act(exts);
 648                         nest = nla_nest_start(skb, exts->police);
 649                         if (nest == NULL || !act)
 650                                 goto nla_put_failure;
 651                         if (tcf_action_dump_old(skb, act, 0, 0) < 0)
 652                                 goto nla_put_failure;
 653                         nla_nest_end(skb, nest);
 654                 }
 655         }
 656         return 0;
 657
 658 nla_put_failure:
 659         nla_nest_cancel(skb, nest);
 660         return -1;
 661 #else
 662         return 0;
 663 #endif
 664 }
 665 EXPORT_SYMBOL(tcf_exts_dump);
 666
 667
 668 int tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts)
 669 {
 670 #ifdef CONFIG_NET_CLS_ACT
 671         struct tc_action *a = tcf_exts_first_act(exts);
 672         if (a != NULL && tcf_action_copy_stats(skb, a, 1) < 0)
 673                 return -1;
 674 #endif
 675         return 0;
 676 }
 677 EXPORT_SYMBOL(tcf_exts_dump_stats);
 678
 679 static int __init tc_filter_init(void)
 680 {
 681         rtnl_register(PF_UNSPEC, RTM_NEWTFILTER, tc_ctl_tfilter, NULL, NULL);
 682         rtnl_register(PF_UNSPEC, RTM_DELTFILTER, tc_ctl_tfilter, NULL, NULL);
 683         rtnl_register(PF_UNSPEC, RTM_GETTFILTER, tc_ctl_tfilter,
 684                       tc_dump_tfilter, NULL);
 685
 686         return 0;
 687 }
 688
 689 subsys_initcall(tc_filter_init);