git.oblomov.eu Git - linux-2.6/blob - 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 <asm/uaccess.h>
  18 #include <asm/system.h>
  19 #include <linux/bitops.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/string.h>
  25 #include <linux/mm.h>
  26 #include <linux/socket.h>
  27 #include <linux/sockios.h>
  28 #include <linux/in.h>
  29 #include <linux/errno.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/netdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/init.h>
  35 #include <linux/kmod.h>
  36 #include <net/sock.h>
  37 #include <net/pkt_sched.h>
  38 #include <net/pkt_cls.h>
  39
  40 #if 0 /* control */
  41 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  42 #else
  43 #define DPRINTK(format,args...)
  44 #endif
  45
  46 /* The list of all installed classifier types */
  47
  48 static struct tcf_proto_ops *tcf_proto_base;
  49
  50 /* Protects list of registered TC modules. It is pure SMP lock. */
  51 static DEFINE_RWLOCK(cls_mod_lock);
  52
  53 /* Find classifier type by string name */
  54
  55 static struct tcf_proto_ops * tcf_proto_lookup_ops(struct rtattr *kind)
  56 {
  57         struct tcf_proto_ops *t = NULL;
  58
  59         if (kind) {
  60                 read_lock(&cls_mod_lock);
  61                 for (t = tcf_proto_base; t; t = t->next) {
  62                         if (rtattr_strcmp(kind, t->kind) == 0) {
  63                                 if (!try_module_get(t->owner))
  64                                         t = NULL;
  65                                 break;
  66                         }
  67                 }
  68                 read_unlock(&cls_mod_lock);
  69         }
  70         return t;
  71 }
  72
  73 /* Register(unregister) new classifier type */
  74
  75 int register_tcf_proto_ops(struct tcf_proto_ops *ops)
  76 {
  77         struct tcf_proto_ops *t, **tp;
  78         int rc = -EEXIST;
  79
  80         write_lock(&cls_mod_lock);
  81         for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
  82                 if (!strcmp(ops->kind, t->kind))
  83                         goto out;
  84
  85         ops->next = NULL;
  86         *tp = ops;
  87         rc = 0;
  88 out:
  89         write_unlock(&cls_mod_lock);
  90         return rc;
  91 }
  92
  93 int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
  94 {
  95         struct tcf_proto_ops *t, **tp;
  96         int rc = -ENOENT;
  97
  98         write_lock(&cls_mod_lock);
  99         for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next)
 100                 if (t == ops)
 101                         break;
 102
 103         if (!t)
 104                 goto out;
 105         *tp = t->next;
 106         rc = 0;
 107 out:
 108         write_unlock(&cls_mod_lock);
 109         return rc;
 110 }
 111
 112 static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
 113                           struct tcf_proto *tp, unsigned long fh, int event);
 114
 115
 116 /* Select new prio value from the range, managed by kernel. */
 117
 118 static __inline__ u32 tcf_auto_prio(struct tcf_proto *tp)
 119 {
 120         u32 first = TC_H_MAKE(0xC0000000U,0U);
 121
 122         if (tp)
 123                 first = tp->prio-1;
 124
 125         return first;
 126 }
 127
 128 /* Add/change/delete/get a filter node */
 129
 130 static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
 131 {
 132         struct rtattr **tca;
 133         struct tcmsg *t;
 134         u32 protocol;
 135         u32 prio;
 136         u32 nprio;
 137         u32 parent;
 138         struct net_device *dev;
 139         struct Qdisc  *q;
 140         struct tcf_proto **back, **chain;
 141         struct tcf_proto *tp;
 142         struct tcf_proto_ops *tp_ops;
 143         struct Qdisc_class_ops *cops;
 144         unsigned long cl;
 145         unsigned long fh;
 146         int err;
 147
 148 replay:
 149         tca = arg;
 150         t = NLMSG_DATA(n);
 151         protocol = TC_H_MIN(t->tcm_info);
 152         prio = TC_H_MAJ(t->tcm_info);
 153         nprio = prio;
 154         parent = t->tcm_parent;
 155         cl = 0;
 156
 157         if (prio == 0) {
 158                 /* If no priority is given, user wants we allocated it. */
 159                 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
 160                         return -ENOENT;
 161                 prio = TC_H_MAKE(0x80000000U,0U);
 162         }
 163
 164         /* Find head of filter chain. */
 165
 166         /* Find link */
 167         if ((dev = __dev_get_by_index(t->tcm_ifindex)) == NULL)
 168                 return -ENODEV;
 169
 170         /* Find qdisc */
 171         if (!parent) {
 172                 q = dev->qdisc_sleeping;
 173                 parent = q->handle;
 174         } else if ((q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent))) == NULL)
 175                 return -EINVAL;
 176
 177         /* Is it classful? */
 178         if ((cops = q->ops->cl_ops) == NULL)
 179                 return -EINVAL;
 180
 181         /* Do we search for filter, attached to class? */
 182         if (TC_H_MIN(parent)) {
 183                 cl = cops->get(q, parent);
 184                 if (cl == 0)
 185                         return -ENOENT;
 186         }
 187
 188         /* And the last stroke */
 189         chain = cops->tcf_chain(q, cl);
 190         err = -EINVAL;
 191         if (chain == NULL)
 192                 goto errout;
 193
 194         /* Check the chain for existence of proto-tcf with this priority */
 195         for (back = chain; (tp=*back) != NULL; back = &tp->next) {
 196                 if (tp->prio >= prio) {
 197                         if (tp->prio == prio) {
 198                                 if (!nprio || (tp->protocol != protocol && protocol))
 199                                         goto errout;
 200                         } else
 201                                 tp = NULL;
 202                         break;
 203                 }
 204         }
 205
 206         if (tp == NULL) {
 207                 /* Proto-tcf does not exist, create new one */
 208
 209                 if (tca[TCA_KIND-1] == NULL || !protocol)
 210                         goto errout;
 211
 212                 err = -ENOENT;
 213                 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
 214                         goto errout;
 215
 216
 217                 /* Create new proto tcf */
 218
 219                 err = -ENOBUFS;
 220                 if ((tp = kmalloc(sizeof(*tp), GFP_KERNEL)) == NULL)
 221                         goto errout;
 222                 err = -EINVAL;
 223                 tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND-1]);
 224                 if (tp_ops == NULL) {
 225 #ifdef CONFIG_KMOD
 226                         struct rtattr *kind = tca[TCA_KIND-1];
 227                         char name[IFNAMSIZ];
 228
 229                         if (kind != NULL &&
 230                             rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
 231                                 rtnl_unlock();
 232                                 request_module("cls_%s", name);
 233                                 rtnl_lock();
 234                                 tp_ops = tcf_proto_lookup_ops(kind);
 235                                 /* We dropped the RTNL semaphore in order to
 236                                  * perform the module load.  So, even if we
 237                                  * succeeded in loading the module we have to
 238                                  * replay the request.  We indicate this using
 239                                  * -EAGAIN.
 240                                  */
 241                                 if (tp_ops != NULL) {
 242                                         module_put(tp_ops->owner);
 243                                         err = -EAGAIN;
 244                                 }
 245                         }
 246 #endif
 247                         kfree(tp);
 248                         goto errout;
 249                 }
 250                 memset(tp, 0, sizeof(*tp));
 251                 tp->ops = tp_ops;
 252                 tp->protocol = protocol;
 253                 tp->prio = nprio ? : tcf_auto_prio(*back);
 254                 tp->q = q;
 255                 tp->classify = tp_ops->classify;
 256                 tp->classid = parent;
 257                 if ((err = tp_ops->init(tp)) != 0) {
 258                         module_put(tp_ops->owner);
 259                         kfree(tp);
 260                         goto errout;
 261                 }
 262
 263                 qdisc_lock_tree(dev);
 264                 tp->next = *back;
 265                 *back = tp;
 266                 qdisc_unlock_tree(dev);
 267
 268         } else if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], tp->ops->kind))
 269                 goto errout;
 270
 271         fh = tp->ops->get(tp, t->tcm_handle);
 272
 273         if (fh == 0) {
 274                 if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
 275                         qdisc_lock_tree(dev);
 276                         *back = tp->next;
 277                         qdisc_unlock_tree(dev);
 278
 279                         tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
 280                         tcf_destroy(tp);
 281                         err = 0;
 282                         goto errout;
 283                 }
 284
 285                 err = -ENOENT;
 286                 if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
 287                         goto errout;
 288         } else {
 289                 switch (n->nlmsg_type) {
 290                 case RTM_NEWTFILTER:
 291                         err = -EEXIST;
 292                         if (n->nlmsg_flags&NLM_F_EXCL)
 293                                 goto errout;
 294                         break;
 295                 case RTM_DELTFILTER:
 296                         err = tp->ops->delete(tp, fh);
 297                         if (err == 0)
 298                                 tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
 299                         goto errout;
 300                 case RTM_GETTFILTER:
 301                         err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
 302                         goto errout;
 303                 default:
 304                         err = -EINVAL;
 305                         goto errout;
 306                 }
 307         }
 308
 309         err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
 310         if (err == 0)
 311                 tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
 312
 313 errout:
 314         if (cl)
 315                 cops->put(q, cl);
 316         if (err == -EAGAIN)
 317                 /* Replay the request. */
 318                 goto replay;
 319         return err;
 320 }
 321
 322 static int
 323 tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh,
 324               u32 pid, u32 seq, u16 flags, int event)
 325 {
 326         struct tcmsg *tcm;
 327         struct nlmsghdr  *nlh;
 328         unsigned char    *b = skb->tail;
 329
 330         nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags);
 331         tcm = NLMSG_DATA(nlh);
 332         tcm->tcm_family = AF_UNSPEC;
 333         tcm->tcm__pad1 = 0;
 334         tcm->tcm__pad1 = 0;
 335         tcm->tcm_ifindex = tp->q->dev->ifindex;
 336         tcm->tcm_parent = tp->classid;
 337         tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
 338         RTA_PUT(skb, TCA_KIND, IFNAMSIZ, tp->ops->kind);
 339         tcm->tcm_handle = fh;
 340         if (RTM_DELTFILTER != event) {
 341                 tcm->tcm_handle = 0;
 342                 if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
 343                         goto rtattr_failure;
 344         }
 345         nlh->nlmsg_len = skb->tail - b;
 346         return skb->len;
 347
 348 nlmsg_failure:
 349 rtattr_failure:
 350         skb_trim(skb, b - skb->data);
 351         return -1;
 352 }
 353
 354 static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
 355                           struct tcf_proto *tp, unsigned long fh, int event)
 356 {
 357         struct sk_buff *skb;
 358         u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
 359
 360         skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
 361         if (!skb)
 362                 return -ENOBUFS;
 363
 364         if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
 365                 kfree_skb(skb);
 366                 return -EINVAL;
 367         }
 368
 369         return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
 370 }
 371
 372 struct tcf_dump_args
 373 {
 374         struct tcf_walker w;
 375         struct sk_buff *skb;
 376         struct netlink_callback *cb;
 377 };
 378
 379 static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, struct tcf_walker *arg)
 380 {
 381         struct tcf_dump_args *a = (void*)arg;
 382
 383         return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
 384                              a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
 385 }
 386
 387 static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
 388 {
 389         int t;
 390         int s_t;
 391         struct net_device *dev;
 392         struct Qdisc *q;
 393         struct tcf_proto *tp, **chain;
 394         struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh);
 395         unsigned long cl = 0;
 396         struct Qdisc_class_ops *cops;
 397         struct tcf_dump_args arg;
 398
 399         if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
 400                 return skb->len;
 401         if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL)
 402                 return skb->len;
 403
 404         read_lock(&qdisc_tree_lock);
 405         if (!tcm->tcm_parent)
 406                 q = dev->qdisc_sleeping;
 407         else
 408                 q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
 409         if (!q)
 410                 goto out;
 411         if ((cops = q->ops->cl_ops) == NULL)
 412                 goto errout;
 413         if (TC_H_MIN(tcm->tcm_parent)) {
 414                 cl = cops->get(q, tcm->tcm_parent);
 415                 if (cl == 0)
 416                         goto errout;
 417         }
 418         chain = cops->tcf_chain(q, cl);
 419         if (chain == NULL)
 420                 goto errout;
 421
 422         s_t = cb->args[0];
 423
 424         for (tp=*chain, t=0; tp; tp = tp->next, t++) {
 425                 if (t < s_t) continue;
 426                 if (TC_H_MAJ(tcm->tcm_info) &&
 427                     TC_H_MAJ(tcm->tcm_info) != tp->prio)
 428                         continue;
 429                 if (TC_H_MIN(tcm->tcm_info) &&
 430                     TC_H_MIN(tcm->tcm_info) != tp->protocol)
 431                         continue;
 432                 if (t > s_t)
 433                         memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
 434                 if (cb->args[1] == 0) {
 435                         if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
 436                                           cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER) <= 0) {
 437                                 break;
 438                         }
 439                         cb->args[1] = 1;
 440                 }
 441                 if (tp->ops->walk == NULL)
 442                         continue;
 443                 arg.w.fn = tcf_node_dump;
 444                 arg.skb = skb;
 445                 arg.cb = cb;
 446                 arg.w.stop = 0;
 447                 arg.w.skip = cb->args[1]-1;
 448                 arg.w.count = 0;
 449                 tp->ops->walk(tp, &arg.w);
 450                 cb->args[1] = arg.w.count+1;
 451                 if (arg.w.stop)
 452                         break;
 453         }
 454
 455         cb->args[0] = t;
 456
 457 errout:
 458         if (cl)
 459                 cops->put(q, cl);
 460 out:
 461         read_unlock(&qdisc_tree_lock);
 462         dev_put(dev);
 463         return skb->len;
 464 }
 465
 466 void
 467 tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
 468 {
 469 #ifdef CONFIG_NET_CLS_ACT
 470         if (exts->action) {
 471                 tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
 472                 exts->action = NULL;
 473         }
 474 #elif defined CONFIG_NET_CLS_POLICE
 475         if (exts->police) {
 476                 tcf_police_release(exts->police, TCA_ACT_UNBIND);
 477                 exts->police = NULL;
 478         }
 479 #endif
 480 }
 481
 482
 483 int
 484 tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb,
 485                   struct rtattr *rate_tlv, struct tcf_exts *exts,
 486                   struct tcf_ext_map *map)
 487 {
 488         memset(exts, 0, sizeof(*exts));
 489
 490 #ifdef CONFIG_NET_CLS_ACT
 491         {
 492                 int err;
 493                 struct tc_action *act;
 494
 495                 if (map->police && tb[map->police-1]) {
 496                         act = tcf_action_init_1(tb[map->police-1], rate_tlv, "police",
 497                                 TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
 498                         if (act == NULL)
 499                                 return err;
 500
 501                         act->type = TCA_OLD_COMPAT;
 502                         exts->action = act;
 503                 } else if (map->action && tb[map->action-1]) {
 504                         act = tcf_action_init(tb[map->action-1], rate_tlv, NULL,
 505                                 TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
 506                         if (act == NULL)
 507                                 return err;
 508
 509                         exts->action = act;
 510                 }
 511         }
 512 #elif defined CONFIG_NET_CLS_POLICE
 513         if (map->police && tb[map->police-1]) {
 514                 struct tcf_police *p;
 515
 516                 p = tcf_police_locate(tb[map->police-1], rate_tlv);
 517                 if (p == NULL)
 518                         return -EINVAL;
 519
 520                 exts->police = p;
 521         } else if (map->action && tb[map->action-1])
 522                 return -EOPNOTSUPP;
 523 #else
 524         if ((map->action && tb[map->action-1]) ||
 525             (map->police && tb[map->police-1]))
 526                 return -EOPNOTSUPP;
 527 #endif
 528
 529         return 0;
 530 }
 531
 532 void
 533 tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
 534                 struct tcf_exts *src)
 535 {
 536 #ifdef CONFIG_NET_CLS_ACT
 537         if (src->action) {
 538                 struct tc_action *act;
 539                 tcf_tree_lock(tp);
 540                 act = xchg(&dst->action, src->action);
 541                 tcf_tree_unlock(tp);
 542                 if (act)
 543                         tcf_action_destroy(act, TCA_ACT_UNBIND);
 544         }
 545 #elif defined CONFIG_NET_CLS_POLICE
 546         if (src->police) {
 547                 struct tcf_police *p;
 548                 tcf_tree_lock(tp);
 549                 p = xchg(&dst->police, src->police);
 550                 tcf_tree_unlock(tp);
 551                 if (p)
 552                         tcf_police_release(p, TCA_ACT_UNBIND);
 553         }
 554 #endif
 555 }
 556
 557 int
 558 tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
 559               struct tcf_ext_map *map)
 560 {
 561 #ifdef CONFIG_NET_CLS_ACT
 562         if (map->action && exts->action) {
 563                 /*
 564                  * again for backward compatible mode - we want
 565                  * to work with both old and new modes of entering
 566                  * tc data even if iproute2  was newer - jhs
 567                  */
 568                 struct rtattr * p_rta = (struct rtattr*) skb->tail;
 569
 570                 if (exts->action->type != TCA_OLD_COMPAT) {
 571                         RTA_PUT(skb, map->action, 0, NULL);
 572                         if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
 573                                 goto rtattr_failure;
 574                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 575                 } else if (map->police) {
 576                         RTA_PUT(skb, map->police, 0, NULL);
 577                         if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
 578                                 goto rtattr_failure;
 579                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 580                 }
 581         }
 582 #elif defined CONFIG_NET_CLS_POLICE
 583         if (map->police && exts->police) {
 584                 struct rtattr * p_rta = (struct rtattr*) skb->tail;
 585
 586                 RTA_PUT(skb, map->police, 0, NULL);
 587
 588                 if (tcf_police_dump(skb, exts->police) < 0)
 589                         goto rtattr_failure;
 590
 591                 p_rta->rta_len = skb->tail - (u8*)p_rta;
 592         }
 593 #endif
 594         return 0;
 595 rtattr_failure: __attribute__ ((unused))
 596         return -1;
 597 }
 598
 599 int
 600 tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
 601                     struct tcf_ext_map *map)
 602 {
 603 #ifdef CONFIG_NET_CLS_ACT
 604         if (exts->action)
 605                 if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
 606                         goto rtattr_failure;
 607 #elif defined CONFIG_NET_CLS_POLICE
 608         if (exts->police)
 609                 if (tcf_police_dump_stats(skb, exts->police) < 0)
 610                         goto rtattr_failure;
 611 #endif
 612         return 0;
 613 rtattr_failure: __attribute__ ((unused))
 614         return -1;
 615 }
 616
 617 static int __init tc_filter_init(void)
 618 {
 619         struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
 620
 621         /* Setup rtnetlink links. It is made here to avoid
 622            exporting large number of public symbols.
 623          */
 624
 625         if (link_p) {
 626                 link_p[RTM_NEWTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
 627                 link_p[RTM_DELTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
 628                 link_p[RTM_GETTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
 629                 link_p[RTM_GETTFILTER-RTM_BASE].dumpit = tc_dump_tfilter;
 630         }
 631         return 0;
 632 }
 633
 634 subsys_initcall(tc_filter_init);
 635
 636 EXPORT_SYMBOL(register_tcf_proto_ops);
 637 EXPORT_SYMBOL(unregister_tcf_proto_ops);
 638 EXPORT_SYMBOL(tcf_exts_validate);
 639 EXPORT_SYMBOL(tcf_exts_destroy);
 640 EXPORT_SYMBOL(tcf_exts_change);
 641 EXPORT_SYMBOL(tcf_exts_dump);
 642 EXPORT_SYMBOL(tcf_exts_dump_stats);