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