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_work rwork;
  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 void tcindex_destroy_work(struct work_struct *work)
 225 {
 226         struct tcindex_data *p = container_of(to_rcu_work(work),
 227                                               struct tcindex_data,
 228                                               rwork);
 229
 230         kfree(p->perfect);
 231         kfree(p->h);
 232         kfree(p);
 233 }
 234
 235 static inline int
 236 valid_perfect_hash(struct tcindex_data *p)
 237 {
 238         return  p->hash > (p->mask >> p->shift);
 239 }
 240
 241 static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
 242         [TCA_TCINDEX_HASH]              = { .type = NLA_U32 },
 243         [TCA_TCINDEX_MASK]              = { .type = NLA_U16 },
 244         [TCA_TCINDEX_SHIFT]             = { .type = NLA_U32 },
 245         [TCA_TCINDEX_FALL_THROUGH]      = { .type = NLA_U32 },
 246         [TCA_TCINDEX_CLASSID]           = { .type = NLA_U32 },
 247 };
 248
 249 static int tcindex_filter_result_init(struct tcindex_filter_result *r)
 250 {
 251         memset(r, 0, sizeof(*r));
 252         return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 253 }
 254
 255 static void tcindex_partial_destroy_work(struct work_struct *work)
 256 {
 257         struct tcindex_data *p = container_of(to_rcu_work(work),
 258                                               struct tcindex_data,
 259                                               rwork);
 260
 261         kfree(p->perfect);
 262         kfree(p);
 263 }
 264
 265 static void tcindex_free_perfect_hash(struct tcindex_data *cp)
 266 {
 267         int i;
 268
 269         for (i = 0; i < cp->hash; i++)
 270                 tcf_exts_destroy(&cp->perfect[i].exts);
 271         kfree(cp->perfect);
 272 }
 273
 274 static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp)
 275 {
 276         int i, err = 0;
 277
 278         cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
 279                               GFP_KERNEL);
 280         if (!cp->perfect)
 281                 return -ENOMEM;
 282
 283         for (i = 0; i < cp->hash; i++) {
 284                 err = tcf_exts_init(&cp->perfect[i].exts,
 285                                     TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 286                 if (err < 0)
 287                         goto errout;
 288 #ifdef CONFIG_NET_CLS_ACT
 289                 cp->perfect[i].exts.net = net;
 290 #endif
 291         }
 292
 293         return 0;
 294
 295 errout:
 296         tcindex_free_perfect_hash(cp);
 297         return err;
 298 }
 299
 300 static int
 301 tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 302                   u32 handle, struct tcindex_data *p,
 303                   struct tcindex_filter_result *r, struct nlattr **tb,
 304                   struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
 305 {
 306         struct tcindex_filter_result new_filter_result, *old_r = r;
 307         struct tcindex_data *cp = NULL, *oldp;
 308         struct tcindex_filter *f = NULL; /* make gcc behave */
 309         struct tcf_result cr = {};
 310         int err, balloc = 0;
 311         struct tcf_exts e;
 312
 313         err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 314         if (err < 0)
 315                 return err;
 316         err = tcf_exts_validate(net, tp, tb, est, &e, ovr, extack);
 317         if (err < 0)
 318                 goto errout;
 319
 320         err = -ENOMEM;
 321         /* tcindex_data attributes must look atomic to classifier/lookup so
 322          * allocate new tcindex data and RCU assign it onto root. Keeping
 323          * perfect hash and hash pointers from old data.
 324          */
 325         cp = kzalloc(sizeof(*cp), GFP_KERNEL);
 326         if (!cp)
 327                 goto errout;
 328
 329         cp->mask = p->mask;
 330         cp->shift = p->shift;
 331         cp->hash = p->hash;
 332         cp->alloc_hash = p->alloc_hash;
 333         cp->fall_through = p->fall_through;
 334         cp->tp = tp;
 335
 336         if (p->perfect) {
 337                 int i;
 338
 339                 if (tcindex_alloc_perfect_hash(net, cp) < 0)
 340                         goto errout;
 341                 for (i = 0; i < cp->hash; i++)
 342                         cp->perfect[i].res = p->perfect[i].res;
 343                 balloc = 1;
 344         }
 345         cp->h = p->h;
 346
 347         err = tcindex_filter_result_init(&new_filter_result);
 348         if (err < 0)
 349                 goto errout1;
 350         if (old_r)
 351                 cr = r->res;
 352
 353         if (tb[TCA_TCINDEX_HASH])
 354                 cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
 355
 356         if (tb[TCA_TCINDEX_MASK])
 357                 cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
 358
 359         if (tb[TCA_TCINDEX_SHIFT])
 360                 cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
 361
 362         err = -EBUSY;
 363
 364         /* Hash already allocated, make sure that we still meet the
 365          * requirements for the allocated hash.
 366          */
 367         if (cp->perfect) {
 368                 if (!valid_perfect_hash(cp) ||
 369                     cp->hash > cp->alloc_hash)
 370                         goto errout_alloc;
 371         } else if (cp->h && cp->hash != cp->alloc_hash) {
 372                 goto errout_alloc;
 373         }
 374
 375         err = -EINVAL;
 376         if (tb[TCA_TCINDEX_FALL_THROUGH])
 377                 cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
 378
 379         if (!cp->hash) {
 380                 /* Hash not specified, use perfect hash if the upper limit
 381                  * of the hashing index is below the threshold.
 382                  */
 383                 if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
 384                         cp->hash = (cp->mask >> cp->shift) + 1;
 385                 else
 386                         cp->hash = DEFAULT_HASH_SIZE;
 387         }
 388
 389         if (!cp->perfect && !cp->h)
 390                 cp->alloc_hash = cp->hash;
 391
 392         /* Note: this could be as restrictive as if (handle & ~(mask >> shift))
 393          * but then, we'd fail handles that may become valid after some future
 394          * mask change. While this is extremely unlikely to ever matter,
 395          * the check below is safer (and also more backwards-compatible).
 396          */
 397         if (cp->perfect || valid_perfect_hash(cp))
 398                 if (handle >= cp->alloc_hash)
 399                         goto errout_alloc;
 400
 401
 402         err = -ENOMEM;
 403         if (!cp->perfect && !cp->h) {
 404                 if (valid_perfect_hash(cp)) {
 405                         if (tcindex_alloc_perfect_hash(net, cp) < 0)
 406                                 goto errout_alloc;
 407                         balloc = 1;
 408                 } else {
 409                         struct tcindex_filter __rcu **hash;
 410
 411                         hash = kcalloc(cp->hash,
 412                                        sizeof(struct tcindex_filter *),
 413                                        GFP_KERNEL);
 414
 415                         if (!hash)
 416                                 goto errout_alloc;
 417
 418                         cp->h = hash;
 419                         balloc = 2;
 420                 }
 421         }
 422
 423         if (cp->perfect)
 424                 r = cp->perfect + handle;
 425         else
 426                 r = tcindex_lookup(cp, handle) ? : &new_filter_result;
 427
 428         if (r == &new_filter_result) {
 429                 f = kzalloc(sizeof(*f), GFP_KERNEL);
 430                 if (!f)
 431                         goto errout_alloc;
 432                 f->key = handle;
 433                 f->next = NULL;
 434                 err = tcindex_filter_result_init(&f->result);
 435                 if (err < 0) {
 436                         kfree(f);
 437                         goto errout_alloc;
 438                 }
 439         }
 440
 441         if (tb[TCA_TCINDEX_CLASSID]) {
 442                 cr.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
 443                 tcf_bind_filter(tp, &cr, base);
 444         }
 445
 446         if (old_r && old_r != r) {
 447                 err = tcindex_filter_result_init(old_r);
 448                 if (err < 0) {
 449                         kfree(f);
 450                         goto errout_alloc;
 451                 }
 452         }
 453
 454         oldp = p;
 455         r->res = cr;
 456         tcf_exts_change(&r->exts, &e);
 457
 458         rcu_assign_pointer(tp->root, cp);
 459
 460         if (r == &new_filter_result) {
 461                 struct tcindex_filter *nfp;
 462                 struct tcindex_filter __rcu **fp;
 463
 464                 f->result.res = r->res;
 465                 tcf_exts_change(&f->result.exts, &r->exts);
 466
 467                 fp = cp->h + (handle % cp->hash);
 468                 for (nfp = rtnl_dereference(*fp);
 469                      nfp;
 470                      fp = &nfp->next, nfp = rtnl_dereference(*fp))
 471                                 ; /* nothing */
 472
 473                 rcu_assign_pointer(*fp, f);
 474         } else {
 475                 tcf_exts_destroy(&new_filter_result.exts);
 476         }
 477
 478         if (oldp)
 479                 tcf_queue_work(&oldp->rwork, tcindex_partial_destroy_work);
 480         return 0;
 481
 482 errout_alloc:
 483         if (balloc == 1)
 484                 tcindex_free_perfect_hash(cp);
 485         else if (balloc == 2)
 486                 kfree(cp->h);
 487 errout1:
 488         tcf_exts_destroy(&new_filter_result.exts);
 489 errout:
 490         kfree(cp);
 491         tcf_exts_destroy(&e);
 492         return err;
 493 }
 494
 495 static int
 496 tcindex_change(struct net *net, struct sk_buff *in_skb,
 497                struct tcf_proto *tp, unsigned long base, u32 handle,
 498                struct nlattr **tca, void **arg, bool ovr,
 499                struct netlink_ext_ack *extack)
 500 {
 501         struct nlattr *opt = tca[TCA_OPTIONS];
 502         struct nlattr *tb[TCA_TCINDEX_MAX + 1];
 503         struct tcindex_data *p = rtnl_dereference(tp->root);
 504         struct tcindex_filter_result *r = *arg;
 505         int err;
 506
 507         pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
 508             "p %p,r %p,*arg %p\n",
 509             tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL);
 510
 511         if (!opt)
 512                 return 0;
 513
 514         err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy, NULL);
 515         if (err < 0)
 516                 return err;
 517
 518         return tcindex_set_parms(net, tp, base, handle, p, r, tb,
 519                                  tca[TCA_RATE], ovr, extack);
 520 }
 521
 522 static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
 523 {
 524         struct tcindex_data *p = rtnl_dereference(tp->root);
 525         struct tcindex_filter *f, *next;
 526         int i;
 527
 528         pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
 529         if (p->perfect) {
 530                 for (i = 0; i < p->hash; i++) {
 531                         if (!p->perfect[i].res.class)
 532                                 continue;
 533                         if (walker->count >= walker->skip) {
 534                                 if (walker->fn(tp, p->perfect + i, walker) < 0) {
 535                                         walker->stop = 1;
 536                                         return;
 537                                 }
 538                         }
 539                         walker->count++;
 540                 }
 541         }
 542         if (!p->h)
 543                 return;
 544         for (i = 0; i < p->hash; i++) {
 545                 for (f = rtnl_dereference(p->h[i]); f; f = next) {
 546                         next = rtnl_dereference(f->next);
 547                         if (walker->count >= walker->skip) {
 548                                 if (walker->fn(tp, &f->result, walker) < 0) {
 549                                         walker->stop = 1;
 550                                         return;
 551                                 }
 552                         }
 553                         walker->count++;
 554                 }
 555         }
 556 }
 557
 558 static void tcindex_destroy(struct tcf_proto *tp,
 559                             struct netlink_ext_ack *extack)
 560 {
 561         struct tcindex_data *p = rtnl_dereference(tp->root);
 562         int i;
 563
 564         pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
 565
 566         if (p->perfect) {
 567                 for (i = 0; i < p->hash; i++) {
 568                         struct tcindex_filter_result *r = p->perfect + i;
 569
 570                         tcf_unbind_filter(tp, &r->res);
 571                         if (tcf_exts_get_net(&r->exts))
 572                                 tcf_queue_work(&r->rwork,
 573                                                tcindex_destroy_rexts_work);
 574                         else
 575                                 __tcindex_destroy_rexts(r);
 576                 }
 577         }
 578
 579         for (i = 0; p->h && i < p->hash; i++) {
 580                 struct tcindex_filter *f, *next;
 581                 bool last;
 582
 583                 for (f = rtnl_dereference(p->h[i]); f; f = next) {
 584                         next = rtnl_dereference(f->next);
 585                         tcindex_delete(tp, &f->result, &last, NULL);
 586                 }
 587         }
 588
 589         tcf_queue_work(&p->rwork, tcindex_destroy_work);
 590 }
 591
 592
 593 static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh,
 594                         struct sk_buff *skb, struct tcmsg *t)
 595 {
 596         struct tcindex_data *p = rtnl_dereference(tp->root);
 597         struct tcindex_filter_result *r = fh;
 598         struct nlattr *nest;
 599
 600         pr_debug("tcindex_dump(tp %p,fh %p,skb %p,t %p),p %p,r %p\n",
 601                  tp, fh, skb, t, p, r);
 602         pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
 603
 604         nest = nla_nest_start(skb, TCA_OPTIONS);
 605         if (nest == NULL)
 606                 goto nla_put_failure;
 607
 608         if (!fh) {
 609                 t->tcm_handle = ~0; /* whatever ... */
 610                 if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) ||
 611                     nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) ||
 612                     nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) ||
 613                     nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through))
 614                         goto nla_put_failure;
 615                 nla_nest_end(skb, nest);
 616         } else {
 617                 if (p->perfect) {
 618                         t->tcm_handle = r - p->perfect;
 619                 } else {
 620                         struct tcindex_filter *f;
 621                         struct tcindex_filter __rcu **fp;
 622                         int i;
 623
 624                         t->tcm_handle = 0;
 625                         for (i = 0; !t->tcm_handle && i < p->hash; i++) {
 626                                 fp = &p->h[i];
 627                                 for (f = rtnl_dereference(*fp);
 628                                      !t->tcm_handle && f;
 629                                      fp = &f->next, f = rtnl_dereference(*fp)) {
 630                                         if (&f->result == r)
 631                                                 t->tcm_handle = f->key;
 632                                 }
 633                         }
 634                 }
 635                 pr_debug("handle = %d\n", t->tcm_handle);
 636                 if (r->res.class &&
 637                     nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid))
 638                         goto nla_put_failure;
 639
 640                 if (tcf_exts_dump(skb, &r->exts) < 0)
 641                         goto nla_put_failure;
 642                 nla_nest_end(skb, nest);
 643
 644                 if (tcf_exts_dump_stats(skb, &r->exts) < 0)
 645                         goto nla_put_failure;
 646         }
 647
 648         return skb->len;
 649
 650 nla_put_failure:
 651         nla_nest_cancel(skb, nest);
 652         return -1;
 653 }
 654
 655 static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl)
 656 {
 657         struct tcindex_filter_result *r = fh;
 658
 659         if (r && r->res.classid == classid)
 660                 r->res.class = cl;
 661 }
 662
 663 static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
 664         .kind           =       "tcindex",
 665         .classify       =       tcindex_classify,
 666         .init           =       tcindex_init,
 667         .destroy        =       tcindex_destroy,
 668         .get            =       tcindex_get,
 669         .change         =       tcindex_change,
 670         .delete         =       tcindex_delete,
 671         .walk           =       tcindex_walk,
 672         .dump           =       tcindex_dump,
 673         .bind_class     =       tcindex_bind_class,
 674         .owner          =       THIS_MODULE,
 675 };
 676
 677 static int __init init_tcindex(void)
 678 {
 679         return register_tcf_proto_ops(&cls_tcindex_ops);
 680 }
 681
 682 static void __exit exit_tcindex(void)
 683 {
 684         unregister_tcf_proto_ops(&cls_tcindex_ops);
 685 }
 686
 687 module_init(init_tcindex)
 688 module_exit(exit_tcindex)
 689 MODULE_LICENSE("GPL");