net/sched/cls_tcindex.c

   1 /*
   2  * net/sched/cls_tcindex.c      Packet classifier for skb->tc_index
   3  *
   4  * Written 1998,1999 by Werner Almesberger, EPFL ICA
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <net/act_api.h>
  14 #include <net/netlink.h>
  15 #include <net/pkt_cls.h>
  16 #include <net/sch_generic.h>
  17
  18 /*
  19  * Passing parameters to the root seems to be done more awkwardly than really
  20  * necessary. At least, u32 doesn't seem to use such dirty hacks. To be
  21  * verified. FIXME.
  22  */
  23
  24 #define PERFECT_HASH_THRESHOLD  64      /* use perfect hash if not bigger */
  25 #define DEFAULT_HASH_SIZE       64      /* optimized for diffserv */
  26
  27
  28 struct tcindex_filter_result {
  29         struct tcf_exts         exts;
  30         struct tcf_result       res;
  31         struct rcu_work         rwork;
  32 };
  33
  34 struct tcindex_filter {
  35         u16 key;
  36         struct tcindex_filter_result result;
  37         struct tcindex_filter __rcu *next;
  38         struct rcu_work rwork;
  39 };
  40
  41
  42 struct tcindex_data {
  43         struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
  44         struct tcindex_filter __rcu **h; /* imperfect hash; */
  45         struct tcf_proto *tp;
  46         u16 mask;               /* AND key with mask */
  47         u32 shift;              /* shift ANDed key to the right */
  48         u32 hash;               /* hash table size; 0 if undefined */
  49         u32 alloc_hash;         /* allocated size */
  50         u32 fall_through;       /* 0: only classify if explicit match */
  51         struct rcu_head rcu;
  52 };
  53
  54 static inline int tcindex_filter_is_set(struct tcindex_filter_result *r)
  55 {
  56         return tcf_exts_has_actions(&r->exts) || r->res.classid;
  57 }
  58
  59 static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
  60                                                     u16 key)
  61 {
  62         if (p->perfect) {
  63                 struct tcindex_filter_result *f = p->perfect + key;
  64
  65                 return tcindex_filter_is_set(f) ? f : NULL;
  66         } else if (p->h) {
  67                 struct tcindex_filter __rcu **fp;
  68                 struct tcindex_filter *f;
  69
  70                 fp = &p->h[key % p->hash];
  71                 for (f = rcu_dereference_bh_rtnl(*fp);
  72                      f;
  73                      fp = &f->next, f = rcu_dereference_bh_rtnl(*fp))
  74                         if (f->key == key)
  75                                 return &f->result;
  76         }
  77
  78         return NULL;
  79 }
  80
  81
  82 static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp,
  83                             struct tcf_result *res)
  84 {
  85         struct tcindex_data *p = rcu_dereference_bh(tp->root);
  86         struct tcindex_filter_result *f;
  87         int key = (skb->tc_index & p->mask) >> p->shift;
  88
  89         pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n",
  90                  skb, tp, res, p);
  91
  92         f = tcindex_lookup(p, key);
  93         if (!f) {
  94                 struct Qdisc *q = tcf_block_q(tp->chain->block);
  95
  96                 if (!p->fall_through)
  97                         return -1;
  98                 res->classid = TC_H_MAKE(TC_H_MAJ(q->handle), key);
  99                 res->class = 0;
 100                 pr_debug("alg 0x%x\n", res->classid);
 101                 return 0;
 102         }
 103         *res = f->res;
 104         pr_debug("map 0x%x\n", res->classid);
 105
 106         return tcf_exts_exec(skb, &f->exts, res);
 107 }
 108
 109
 110 static void *tcindex_get(struct tcf_proto *tp, u32 handle)
 111 {
 112         struct tcindex_data *p = rtnl_dereference(tp->root);
 113         struct tcindex_filter_result *r;
 114
 115         pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle);
 116         if (p->perfect && handle >= p->alloc_hash)
 117                 return NULL;
 118         r = tcindex_lookup(p, handle);
 119         return r && tcindex_filter_is_set(r) ? r : NULL;
 120 }
 121
 122 static int tcindex_init(struct tcf_proto *tp)
 123 {
 124         struct tcindex_data *p;
 125
 126         pr_debug("tcindex_init(tp %p)\n", tp);
 127         p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL);
 128         if (!p)
 129                 return -ENOMEM;
 130
 131         p->mask = 0xffff;
 132         p->hash = DEFAULT_HASH_SIZE;
 133         p->fall_through = 1;
 134
 135         rcu_assign_pointer(tp->root, p);
 136         return 0;
 137 }
 138
 139 static void __tcindex_destroy_rexts(struct tcindex_filter_result *r)
 140 {
 141         tcf_exts_destroy(&r->exts);
 142         tcf_exts_put_net(&r->exts);
 143 }
 144
 145 static void tcindex_destroy_rexts_work(struct work_struct *work)
 146 {
 147         struct tcindex_filter_result *r;
 148
 149         r = container_of(to_rcu_work(work),
 150                          struct tcindex_filter_result,
 151                          rwork);
 152         rtnl_lock();
 153         __tcindex_destroy_rexts(r);
 154         rtnl_unlock();
 155 }
 156
 157 static void __tcindex_destroy_fexts(struct tcindex_filter *f)
 158 {
 159         tcf_exts_destroy(&f->result.exts);
 160         tcf_exts_put_net(&f->result.exts);
 161         kfree(f);
 162 }
 163
 164 static void tcindex_destroy_fexts_work(struct work_struct *work)
 165 {
 166         struct tcindex_filter *f = container_of(to_rcu_work(work),
 167                                                 struct tcindex_filter,
 168                                                 rwork);
 169
 170         rtnl_lock();
 171         __tcindex_destroy_fexts(f);
 172         rtnl_unlock();
 173 }
 174
 175 static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last,
 176                           struct netlink_ext_ack *extack)
 177 {
 178         struct tcindex_data *p = rtnl_dereference(tp->root);
 179         struct tcindex_filter_result *r = arg;
 180         struct tcindex_filter __rcu **walk;
 181         struct tcindex_filter *f = NULL;
 182
 183         pr_debug("tcindex_delete(tp %p,arg %p),p %p\n", tp, arg, p);
 184         if (p->perfect) {
 185                 if (!r->res.class)
 186                         return -ENOENT;
 187         } else {
 188                 int i;
 189
 190                 for (i = 0; i < p->hash; i++) {
 191                         walk = p->h + i;
 192                         for (f = rtnl_dereference(*walk); f;
 193                              walk = &f->next, f = rtnl_dereference(*walk)) {
 194                                 if (&f->result == r)
 195                                         goto found;
 196                         }
 197                 }
 198                 return -ENOENT;
 199
 200 found:
 201                 rcu_assign_pointer(*walk, rtnl_dereference(f->next));
 202         }
 203         tcf_unbind_filter(tp, &r->res);
 204         /* all classifiers are required to call tcf_exts_destroy() after rcu
 205          * grace period, since converted-to-rcu actions are relying on that
 206          * in cleanup() callback
 207          */
 208         if (f) {
 209                 if (tcf_exts_get_net(&f->result.exts))
 210                         tcf_queue_work(&f->rwork, tcindex_destroy_fexts_work);
 211                 else
 212                         __tcindex_destroy_fexts(f);
 213         } else {
 214                 if (tcf_exts_get_net(&r->exts))
 215                         tcf_queue_work(&r->rwork, tcindex_destroy_rexts_work);
 216                 else
 217                         __tcindex_destroy_rexts(r);
 218         }
 219
 220         *last = false;
 221         return 0;
 222 }
 223
 224 static int tcindex_destroy_element(struct tcf_proto *tp,
 225                                    void *arg, struct tcf_walker *walker)
 226 {
 227         bool last;
 228
 229         return tcindex_delete(tp, arg, &last, NULL);
 230 }
 231
 232 static void __tcindex_destroy(struct rcu_head *head)
 233 {
 234         struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
 235
 236         kfree(p->perfect);
 237         kfree(p->h);
 238         kfree(p);
 239 }
 240
 241 static inline int
 242 valid_perfect_hash(struct tcindex_data *p)
 243 {
 244         return  p->hash > (p->mask >> p->shift);
 245 }
 246
 247 static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
 248         [TCA_TCINDEX_HASH]              = { .type = NLA_U32 },
 249         [TCA_TCINDEX_MASK]              = { .type = NLA_U16 },
 250         [TCA_TCINDEX_SHIFT]             = { .type = NLA_U32 },
 251         [TCA_TCINDEX_FALL_THROUGH]      = { .type = NLA_U32 },
 252         [TCA_TCINDEX_CLASSID]           = { .type = NLA_U32 },
 253 };
 254
 255 static int tcindex_filter_result_init(struct tcindex_filter_result *r)
 256 {
 257         memset(r, 0, sizeof(*r));
 258         return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 259 }
 260
 261 static void __tcindex_partial_destroy(struct rcu_head *head)
 262 {
 263         struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
 264
 265         kfree(p->perfect);
 266         kfree(p);
 267 }
 268
 269 static void tcindex_free_perfect_hash(struct tcindex_data *cp)
 270 {
 271         int i;
 272
 273         for (i = 0; i < cp->hash; i++)
 274                 tcf_exts_destroy(&cp->perfect[i].exts);
 275         kfree(cp->perfect);
 276 }
 277
 278 static int tcindex_alloc_perfect_hash(struct tcindex_data *cp)
 279 {
 280         int i, err = 0;
 281
 282         cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
 283                               GFP_KERNEL);
 284         if (!cp->perfect)
 285                 return -ENOMEM;
 286
 287         for (i = 0; i < cp->hash; i++) {
 288                 err = tcf_exts_init(&cp->perfect[i].exts,
 289                                     TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 290                 if (err < 0)
 291                         goto errout;
 292         }
 293
 294         return 0;
 295
 296 errout:
 297         tcindex_free_perfect_hash(cp);
 298         return err;
 299 }
 300
 301 static int
 302 tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 303                   u32 handle, struct tcindex_data *p,
 304                   struct tcindex_filter_result *r, struct nlattr **tb,
 305                   struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
 306 {
 307         struct tcindex_filter_result new_filter_result, *old_r = r;
 308         struct tcindex_filter_result cr;
 309         struct tcindex_data *cp = NULL, *oldp;
 310         struct tcindex_filter *f = NULL; /* make gcc behave */
 311         int err, balloc = 0;
 312         struct tcf_exts e;
 313
 314         err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 315         if (err < 0)
 316                 return err;
 317         err = tcf_exts_validate(net, tp, tb, est, &e, ovr, extack);
 318         if (err < 0)
 319                 goto errout;
 320
 321         err = -ENOMEM;
 322         /* tcindex_data attributes must look atomic to classifier/lookup so
 323          * allocate new tcindex data and RCU assign it onto root. Keeping
 324          * perfect hash and hash pointers from old data.
 325          */
 326         cp = kzalloc(sizeof(*cp), GFP_KERNEL);
 327         if (!cp)
 328                 goto errout;
 329
 330         cp->mask = p->mask;
 331         cp->shift = p->shift;
 332         cp->hash = p->hash;
 333         cp->alloc_hash = p->alloc_hash;
 334         cp->fall_through = p->fall_through;
 335         cp->tp = tp;
 336
 337         if (p->perfect) {
 338                 int i;
 339
 340                 if (tcindex_alloc_perfect_hash(cp) < 0)
 341                         goto errout;
 342                 for (i = 0; i < cp->hash; i++)
 343                         cp->perfect[i].res = p->perfect[i].res;
 344                 balloc = 1;
 345         }
 346         cp->h = p->h;
 347
 348         err = tcindex_filter_result_init(&new_filter_result);
 349         if (err < 0)
 350                 goto errout1;
 351         err = tcindex_filter_result_init(&cr);
 352         if (err < 0)
 353                 goto errout1;
 354         if (old_r)
 355                 cr.res = r->res;
 356
 357         if (tb[TCA_TCINDEX_HASH])
 358                 cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
 359
 360         if (tb[TCA_TCINDEX_MASK])
 361                 cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
 362
 363         if (tb[TCA_TCINDEX_SHIFT])
 364                 cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
 365
 366         err = -EBUSY;
 367
 368         /* Hash already allocated, make sure that we still meet the
 369          * requirements for the allocated hash.
 370          */
 371         if (cp->perfect) {
 372                 if (!valid_perfect_hash(cp) ||
 373                     cp->hash > cp->alloc_hash)
 374                         goto errout_alloc;
 375         } else if (cp->h && cp->hash != cp->alloc_hash) {
 376                 goto errout_alloc;
 377         }
 378
 379         err = -EINVAL;
 380         if (tb[TCA_TCINDEX_FALL_THROUGH])
 381                 cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
 382
 383         if (!cp->hash) {
 384                 /* Hash not specified, use perfect hash if the upper limit
 385                  * of the hashing index is below the threshold.
 386                  */
 387                 if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
 388                         cp->hash = (cp->mask >> cp->shift) + 1;
 389                 else
 390                         cp->hash = DEFAULT_HASH_SIZE;
 391         }
 392
 393         if (!cp->perfect && !cp->h)
 394                 cp->alloc_hash = cp->hash;
 395
 396         /* Note: this could be as restrictive as if (handle & ~(mask >> shift))
 397          * but then, we'd fail handles that may become valid after some future
 398          * mask change. While this is extremely unlikely to ever matter,
 399          * the check below is safer (and also more backwards-compatible).
 400          */
 401         if (cp->perfect || valid_perfect_hash(cp))
 402                 if (handle >= cp->alloc_hash)
 403                         goto errout_alloc;
 404
 405
 406         err = -ENOMEM;
 407         if (!cp->perfect && !cp->h) {
 408                 if (valid_perfect_hash(cp)) {
 409                         if (tcindex_alloc_perfect_hash(cp) < 0)
 410                                 goto errout_alloc;
 411                         balloc = 1;
 412                 } else {
 413                         struct tcindex_filter __rcu **hash;
 414
 415                         hash = kcalloc(cp->hash,
 416                                        sizeof(struct tcindex_filter *),
 417                                        GFP_KERNEL);
 418
 419                         if (!hash)
 420                                 goto errout_alloc;
 421
 422                         cp->h = hash;
 423                         balloc = 2;
 424                 }
 425         }
 426
 427         if (cp->perfect)
 428                 r = cp->perfect + handle;
 429         else
 430                 r = tcindex_lookup(cp, handle) ? : &new_filter_result;
 431
 432         if (r == &new_filter_result) {
 433                 f = kzalloc(sizeof(*f), GFP_KERNEL);
 434                 if (!f)
 435                         goto errout_alloc;
 436                 f->key = handle;
 437                 f->next = NULL;
 438                 err = tcindex_filter_result_init(&f->result);
 439                 if (err < 0) {
 440                         kfree(f);
 441                         goto errout_alloc;
 442                 }
 443         }
 444
 445         if (tb[TCA_TCINDEX_CLASSID]) {
 446                 cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
 447                 tcf_bind_filter(tp, &cr.res, base);
 448         }
 449
 450         if (old_r)
 451                 tcf_exts_change(&r->exts, &e);
 452         else
 453                 tcf_exts_change(&cr.exts, &e);
 454
 455         if (old_r && old_r != r) {
 456                 err = tcindex_filter_result_init(old_r);
 457                 if (err < 0) {
 458                         kfree(f);
 459                         goto errout_alloc;
 460                 }
 461         }
 462
 463         oldp = p;
 464         r->res = cr.res;
 465         rcu_assign_pointer(tp->root, cp);
 466
 467         if (r == &new_filter_result) {
 468                 struct tcindex_filter *nfp;
 469                 struct tcindex_filter __rcu **fp;
 470
 471                 tcf_exts_change(&f->result.exts, &r->exts);
 472
 473                 fp = cp->h + (handle % cp->hash);
 474                 for (nfp = rtnl_dereference(*fp);
 475                      nfp;
 476                      fp = &nfp->next, nfp = rtnl_dereference(*fp))
 477                                 ; /* nothing */
 478
 479                 rcu_assign_pointer(*fp, f);
 480         }
 481
 482         if (oldp)
 483                 call_rcu(&oldp->rcu, __tcindex_partial_destroy);
 484         return 0;
 485
 486 errout_alloc:
 487         if (balloc == 1)
 488                 tcindex_free_perfect_hash(cp);
 489         else if (balloc == 2)
 490                 kfree(cp->h);
 491 errout1:
 492         tcf_exts_destroy(&cr.exts);
 493         tcf_exts_destroy(&new_filter_result.exts);
 494 errout:
 495         kfree(cp);
 496         tcf_exts_destroy(&e);
 497         return err;
 498 }
 499
 500 static int
 501 tcindex_change(struct net *net, struct sk_buff *in_skb,
 502                struct tcf_proto *tp, unsigned long base, u32 handle,
 503                struct nlattr **tca, void **arg, bool ovr,
 504                struct netlink_ext_ack *extack)
 505 {
 506         struct nlattr *opt = tca[TCA_OPTIONS];
 507         struct nlattr *tb[TCA_TCINDEX_MAX + 1];
 508         struct tcindex_data *p = rtnl_dereference(tp->root);
 509         struct tcindex_filter_result *r = *arg;
 510         int err;
 511
 512         pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
 513             "p %p,r %p,*arg %p\n",
 514             tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL);
 515
 516         if (!opt)
 517                 return 0;
 518
 519         err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy, NULL);
 520         if (err < 0)
 521                 return err;
 522
 523         return tcindex_set_parms(net, tp, base, handle, p, r, tb,
 524                                  tca[TCA_RATE], ovr, extack);
 525 }
 526
 527 static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
 528 {
 529         struct tcindex_data *p = rtnl_dereference(tp->root);
 530         struct tcindex_filter *f, *next;
 531         int i;
 532
 533         pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
 534         if (p->perfect) {
 535                 for (i = 0; i < p->hash; i++) {
 536                         if (!p->perfect[i].res.class)
 537                                 continue;
 538                         if (walker->count >= walker->skip) {
 539                                 if (walker->fn(tp, p->perfect + i, walker) < 0) {
 540                                         walker->stop = 1;
 541                                         return;
 542                                 }
 543                         }
 544                         walker->count++;
 545                 }
 546         }
 547         if (!p->h)
 548                 return;
 549         for (i = 0; i < p->hash; i++) {
 550                 for (f = rtnl_dereference(p->h[i]); f; f = next) {
 551                         next = rtnl_dereference(f->next);
 552                         if (walker->count >= walker->skip) {
 553                                 if (walker->fn(tp, &f->result, walker) < 0) {
 554                                         walker->stop = 1;
 555                                         return;
 556                                 }
 557                         }
 558                         walker->count++;
 559                 }
 560         }
 561 }
 562
 563 static void tcindex_destroy(struct tcf_proto *tp,
 564                             struct netlink_ext_ack *extack)
 565 {
 566         struct tcindex_data *p = rtnl_dereference(tp->root);
 567         struct tcf_walker walker;
 568
 569         pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
 570         walker.count = 0;
 571         walker.skip = 0;
 572         walker.fn = tcindex_destroy_element;
 573         tcindex_walk(tp, &walker);
 574
 575         call_rcu(&p->rcu, __tcindex_destroy);
 576 }
 577
 578
 579 static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh,
 580                         struct sk_buff *skb, struct tcmsg *t)
 581 {
 582         struct tcindex_data *p = rtnl_dereference(tp->root);
 583         struct tcindex_filter_result *r = fh;
 584         struct nlattr *nest;
 585
 586         pr_debug("tcindex_dump(tp %p,fh %p,skb %p,t %p),p %p,r %p\n",
 587                  tp, fh, skb, t, p, r);
 588         pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
 589
 590         nest = nla_nest_start(skb, TCA_OPTIONS);
 591         if (nest == NULL)
 592                 goto nla_put_failure;
 593
 594         if (!fh) {
 595                 t->tcm_handle = ~0; /* whatever ... */
 596                 if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) ||
 597                     nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) ||
 598                     nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) ||
 599                     nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through))
 600                         goto nla_put_failure;
 601                 nla_nest_end(skb, nest);
 602         } else {
 603                 if (p->perfect) {
 604                         t->tcm_handle = r - p->perfect;
 605                 } else {
 606                         struct tcindex_filter *f;
 607                         struct tcindex_filter __rcu **fp;
 608                         int i;
 609
 610                         t->tcm_handle = 0;
 611                         for (i = 0; !t->tcm_handle && i < p->hash; i++) {
 612                                 fp = &p->h[i];
 613                                 for (f = rtnl_dereference(*fp);
 614                                      !t->tcm_handle && f;
 615                                      fp = &f->next, f = rtnl_dereference(*fp)) {
 616                                         if (&f->result == r)
 617                                                 t->tcm_handle = f->key;
 618                                 }
 619                         }
 620                 }
 621                 pr_debug("handle = %d\n", t->tcm_handle);
 622                 if (r->res.class &&
 623                     nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid))
 624                         goto nla_put_failure;
 625
 626                 if (tcf_exts_dump(skb, &r->exts) < 0)
 627                         goto nla_put_failure;
 628                 nla_nest_end(skb, nest);
 629
 630                 if (tcf_exts_dump_stats(skb, &r->exts) < 0)
 631                         goto nla_put_failure;
 632         }
 633
 634         return skb->len;
 635
 636 nla_put_failure:
 637         nla_nest_cancel(skb, nest);
 638         return -1;
 639 }
 640
 641 static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl)
 642 {
 643         struct tcindex_filter_result *r = fh;
 644
 645         if (r && r->res.classid == classid)
 646                 r->res.class = cl;
 647 }
 648
 649 static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
 650         .kind           =       "tcindex",
 651         .classify       =       tcindex_classify,
 652         .init           =       tcindex_init,
 653         .destroy        =       tcindex_destroy,
 654         .get            =       tcindex_get,
 655         .change         =       tcindex_change,
 656         .delete         =       tcindex_delete,
 657         .walk           =       tcindex_walk,
 658         .dump           =       tcindex_dump,
 659         .bind_class     =       tcindex_bind_class,
 660         .owner          =       THIS_MODULE,
 661 };
 662
 663 static int __init init_tcindex(void)
 664 {
 665         return register_tcf_proto_ops(&cls_tcindex_ops);
 666 }
 667
 668 static void __exit exit_tcindex(void)
 669 {
 670         unregister_tcf_proto_ops(&cls_tcindex_ops);
 671 }
 672
 673 module_init(init_tcindex)
 674 module_exit(exit_tcindex)
 675 MODULE_LICENSE("GPL");