net/sched/cls_u32.c

   1 /*
   2  * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   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  *      The filters are packed to hash tables of key nodes
  12  *      with a set of 32bit key/mask pairs at every node.
  13  *      Nodes reference next level hash tables etc.
  14  *
  15  *      This scheme is the best universal classifier I managed to
  16  *      invent; it is not super-fast, but it is not slow (provided you
  17  *      program it correctly), and general enough.  And its relative
  18  *      speed grows as the number of rules becomes larger.
  19  *
  20  *      It seems that it represents the best middle point between
  21  *      speed and manageability both by human and by machine.
  22  *
  23  *      It is especially useful for link sharing combined with QoS;
  24  *      pure RSVP doesn't need such a general approach and can use
  25  *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  26  */
  27
  28 #include <asm/uaccess.h>
  29 #include <asm/system.h>
  30 #include <asm/bitops.h>
  31 #include <linux/config.h>
  32 #include <linux/module.h>
  33 #include <linux/types.h>
  34 #include <linux/kernel.h>
  35 #include <linux/sched.h>
  36 #include <linux/string.h>
  37 #include <linux/mm.h>
  38 #include <linux/socket.h>
  39 #include <linux/sockios.h>
  40 #include <linux/in.h>
  41 #include <linux/errno.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/if_ether.h>
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/etherdevice.h>
  47 #include <linux/notifier.h>
  48 #include <linux/rtnetlink.h>
  49 #include <net/ip.h>
  50 #include <net/route.h>
  51 #include <linux/skbuff.h>
  52 #include <net/sock.h>
  53 #include <net/pkt_sched.h>
  54
  55
  56 struct tc_u_knode
  57 {
  58         struct tc_u_knode       *next;
  59         u32                     handle;
  60         struct tc_u_hnode       *ht_up;
  61 #ifdef CONFIG_NET_CLS_POLICE
  62         struct tcf_police       *police;
  63 #endif
  64         struct tcf_result       res;
  65         struct tc_u_hnode       *ht_down;
  66         struct tc_u32_sel       sel;
  67 };
  68
  69 struct tc_u_hnode
  70 {
  71         struct tc_u_hnode       *next;
  72         u32                     handle;
  73         struct tc_u_common      *tp_c;
  74         int                     refcnt;
  75         unsigned                divisor;
  76         u32                     hgenerator;
  77         struct tc_u_knode       *ht[1];
  78 };
  79
  80 struct tc_u_common
  81 {
  82         struct tc_u_common      *next;
  83         struct tc_u_hnode       *hlist;
  84         struct Qdisc            *q;
  85         int                     refcnt;
  86         u32                     hgenerator;
  87 };
  88
  89 static struct tc_u_common *u32_list;
  90
  91 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel)
  92 {
  93         unsigned h = key & sel->hmask;
  94
  95         h ^= h>>16;
  96         h ^= h>>8;
  97         return h;
  98 }
  99
 100 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 101 {
 102         struct {
 103                 struct tc_u_knode *knode;
 104                 u8                *ptr;
 105         } stack[TC_U32_MAXDEPTH];
 106
 107         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 108         u8 *ptr = skb->nh.raw;
 109         struct tc_u_knode *n;
 110         int sdepth = 0;
 111         int off2 = 0;
 112         int sel = 0;
 113         int i;
 114
 115 #if !defined(__i386__) && !defined(__mc68000__)
 116         if ((unsigned long)ptr & 3)
 117                 return -1;
 118 #endif
 119
 120 next_ht:
 121         n = ht->ht[sel];
 122
 123 next_knode:
 124         if (n) {
 125                 struct tc_u32_key *key = n->sel.keys;
 126
 127                 for (i = n->sel.nkeys; i>0; i--, key++) {
 128                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 129                                 n = n->next;
 130                                 goto next_knode;
 131                         }
 132                 }
 133                 if (n->ht_down == NULL) {
 134 check_terminal:
 135                         if (n->sel.flags&TC_U32_TERMINAL) {
 136                                 *res = n->res;
 137 #ifdef CONFIG_NET_CLS_POLICE
 138                                 if (n->police) {
 139                                         int pol_res = tcf_police(skb, n->police);
 140                                         if (pol_res >= 0)
 141                                                 return pol_res;
 142                                 } else
 143 #endif
 144                                         return 0;
 145                         }
 146                         n = n->next;
 147                         goto next_knode;
 148                 }
 149
 150                 /* PUSH */
 151                 if (sdepth >= TC_U32_MAXDEPTH)
 152                         goto deadloop;
 153                 stack[sdepth].knode = n;
 154                 stack[sdepth].ptr = ptr;
 155                 sdepth++;
 156
 157                 ht = n->ht_down;
 158                 sel = 0;
 159                 if (ht->divisor)
 160                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel);
 161
 162                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 163                         goto next_ht;
 164
 165                 if (n->sel.flags&(TC_U32_EAT|TC_U32_VAROFFSET)) {
 166                         off2 = n->sel.off + 3;
 167                         if (n->sel.flags&TC_U32_VAROFFSET)
 168                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 169                         off2 &= ~3;
 170                 }
 171                 if (n->sel.flags&TC_U32_EAT) {
 172                         ptr += off2;
 173                         off2 = 0;
 174                 }
 175
 176                 if (ptr < skb->tail)
 177                         goto next_ht;
 178         }
 179
 180         /* POP */
 181         if (sdepth--) {
 182                 n = stack[sdepth].knode;
 183                 ht = n->ht_up;
 184                 ptr = stack[sdepth].ptr;
 185                 goto check_terminal;
 186         }
 187         return -1;
 188
 189 deadloop:
 190         if (net_ratelimit())
 191                 printk("cls_u32: dead loop\n");
 192         return -1;
 193 }
 194
 195 static __inline__ struct tc_u_hnode *
 196 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 197 {
 198         struct tc_u_hnode *ht;
 199
 200         for (ht = tp_c->hlist; ht; ht = ht->next)
 201                 if (ht->handle == handle)
 202                         break;
 203
 204         return ht;
 205 }
 206
 207 static __inline__ struct tc_u_knode *
 208 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 209 {
 210         unsigned sel;
 211         struct tc_u_knode *n;
 212
 213         sel = TC_U32_HASH(handle);
 214         if (sel > ht->divisor)
 215                 return 0;
 216
 217         for (n = ht->ht[sel]; n; n = n->next)
 218                 if (n->handle == handle)
 219                         return n;
 220
 221         return NULL;
 222 }
 223
 224
 225 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 226 {
 227         struct tc_u_hnode *ht;
 228         struct tc_u_common *tp_c = tp->data;
 229
 230         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 231                 ht = tp->root;
 232         else
 233                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 234
 235         if (!ht)
 236                 return 0;
 237
 238         if (TC_U32_KEY(handle) == 0)
 239                 return (unsigned long)ht;
 240
 241         return (unsigned long)u32_lookup_key(ht, handle);
 242 }
 243
 244 static void u32_put(struct tcf_proto *tp, unsigned long f)
 245 {
 246 }
 247
 248 static u32 gen_new_htid(struct tc_u_common *tp_c)
 249 {
 250         int i = 0x800;
 251
 252         do {
 253                 if (++tp_c->hgenerator == 0x7FF)
 254                         tp_c->hgenerator = 1;
 255         } while (i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 256
 257         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 258 }
 259
 260 static int u32_init(struct tcf_proto *tp)
 261 {
 262         struct tc_u_hnode *root_ht;
 263         struct tc_u_common *tp_c;
 264
 265         MOD_INC_USE_COUNT;
 266
 267         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 268                 if (tp_c->q == tp->q)
 269                         break;
 270
 271         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 272         if (root_ht == NULL) {
 273                 MOD_DEC_USE_COUNT;
 274                 return -ENOBUFS;
 275         }
 276         memset(root_ht, 0, sizeof(*root_ht));
 277         root_ht->divisor = 0;
 278         root_ht->refcnt++;
 279         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 280
 281         if (tp_c == NULL) {
 282                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 283                 if (tp_c == NULL) {
 284                         kfree(root_ht);
 285                         MOD_DEC_USE_COUNT;
 286                         return -ENOBUFS;
 287                 }
 288                 memset(tp_c, 0, sizeof(*tp_c));
 289                 tp_c->q = tp->q;
 290                 tp_c->next = u32_list;
 291                 u32_list = tp_c;
 292         }
 293
 294         tp_c->refcnt++;
 295         root_ht->next = tp_c->hlist;
 296         tp_c->hlist = root_ht;
 297         root_ht->tp_c = tp_c;
 298
 299         tp->root = root_ht;
 300         tp->data = tp_c;
 301         return 0;
 302 }
 303
 304 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 305 {
 306         unsigned long cl;
 307
 308         if ((cl = __cls_set_class(&n->res.class, 0)) != 0)
 309                 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
 310 #ifdef CONFIG_NET_CLS_POLICE
 311         tcf_police_release(n->police);
 312 #endif
 313         if (n->ht_down)
 314                 n->ht_down->refcnt--;
 315         kfree(n);
 316         return 0;
 317 }
 318
 319 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 320 {
 321         struct tc_u_knode **kp;
 322         struct tc_u_hnode *ht = key->ht_up;
 323
 324         if (ht) {
 325                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 326                         if (*kp == key) {
 327                                 tcf_tree_lock(tp);
 328                                 *kp = key->next;
 329                                 tcf_tree_unlock(tp);
 330
 331                                 u32_destroy_key(tp, key);
 332                                 return 0;
 333                         }
 334                 }
 335         }
 336         BUG_TRAP(0);
 337         return 0;
 338 }
 339
 340 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 341 {
 342         struct tc_u_knode *n;
 343         unsigned h;
 344
 345         for (h=0; h<=ht->divisor; h++) {
 346                 while ((n = ht->ht[h]) != NULL) {
 347                         ht->ht[h] = n->next;
 348
 349                         u32_destroy_key(tp, n);
 350                 }
 351         }
 352 }
 353
 354 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 355 {
 356         struct tc_u_common *tp_c = tp->data;
 357         struct tc_u_hnode **hn;
 358
 359         BUG_TRAP(!ht->refcnt);
 360
 361         u32_clear_hnode(tp, ht);
 362
 363         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 364                 if (*hn == ht) {
 365                         *hn = ht->next;
 366                         kfree(ht);
 367                         return 0;
 368                 }
 369         }
 370
 371         BUG_TRAP(0);
 372         return -ENOENT;
 373 }
 374
 375 static void u32_destroy(struct tcf_proto *tp)
 376 {
 377         struct tc_u_common *tp_c = tp->data;
 378         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 379
 380         BUG_TRAP(root_ht != NULL);
 381
 382         if (root_ht && --root_ht->refcnt == 0)
 383                 u32_destroy_hnode(tp, root_ht);
 384
 385         if (--tp_c->refcnt == 0) {
 386                 struct tc_u_hnode *ht;
 387                 struct tc_u_common **tp_cp;
 388
 389                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 390                         if (*tp_cp == tp_c) {
 391                                 *tp_cp = tp_c->next;
 392                                 break;
 393                         }
 394                 }
 395
 396                 for (ht=tp_c->hlist; ht; ht = ht->next)
 397                         u32_clear_hnode(tp, ht);
 398
 399                 while ((ht = tp_c->hlist) != NULL) {
 400                         tp_c->hlist = ht->next;
 401
 402                         BUG_TRAP(ht->refcnt == 0);
 403
 404                         kfree(ht);
 405                 };
 406
 407                 kfree(tp_c);
 408         }
 409
 410         MOD_DEC_USE_COUNT;
 411         tp->data = NULL;
 412 }
 413
 414 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 415 {
 416         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 417
 418         if (ht == NULL)
 419                 return 0;
 420
 421         if (TC_U32_KEY(ht->handle))
 422                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 423
 424         if (tp->root == ht)
 425                 return -EINVAL;
 426
 427         if (--ht->refcnt == 0)
 428                 u32_destroy_hnode(tp, ht);
 429
 430         return 0;
 431 }
 432
 433 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 434 {
 435         struct tc_u_knode *n;
 436         unsigned i = 0x7FF;
 437
 438         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 439                 if (i < TC_U32_NODE(n->handle))
 440                         i = TC_U32_NODE(n->handle);
 441         i++;
 442
 443         return handle|(i>0xFFF ? 0xFFF : i);
 444 }
 445
 446 static int u32_set_parms(struct Qdisc *q, unsigned long base,
 447                          struct tc_u_hnode *ht,
 448                          struct tc_u_knode *n, struct rtattr **tb,
 449                          struct rtattr *est)
 450 {
 451         if (tb[TCA_U32_LINK-1]) {
 452                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 453                 struct tc_u_hnode *ht_down = NULL;
 454
 455                 if (TC_U32_KEY(handle))
 456                         return -EINVAL;
 457
 458                 if (handle) {
 459                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 460
 461                         if (ht_down == NULL)
 462                                 return -EINVAL;
 463                         ht_down->refcnt++;
 464                 }
 465
 466                 sch_tree_lock(q);
 467                 ht_down = xchg(&n->ht_down, ht_down);
 468                 sch_tree_unlock(q);
 469
 470                 if (ht_down)
 471                         ht_down->refcnt--;
 472         }
 473         if (tb[TCA_U32_CLASSID-1]) {
 474                 unsigned long cl;
 475
 476                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 477                 sch_tree_lock(q);
 478                 cl = __cls_set_class(&n->res.class, q->ops->cl_ops->bind_tcf(q, base, n->res.classid));
 479                 sch_tree_unlock(q);
 480                 if (cl)
 481                         q->ops->cl_ops->unbind_tcf(q, cl);
 482         }
 483 #ifdef CONFIG_NET_CLS_POLICE
 484         if (tb[TCA_U32_POLICE-1]) {
 485                 struct tcf_police *police = tcf_police_locate(tb[TCA_U32_POLICE-1], est);
 486
 487                 sch_tree_lock(q);
 488                 police = xchg(&n->police, police);
 489                 sch_tree_unlock(q);
 490
 491                 tcf_police_release(police);
 492         }
 493 #endif
 494         return 0;
 495 }
 496
 497 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 498                       struct rtattr **tca,
 499                       unsigned long *arg)
 500 {
 501         struct tc_u_common *tp_c = tp->data;
 502         struct tc_u_hnode *ht;
 503         struct tc_u_knode *n;
 504         struct tc_u32_sel *s;
 505         struct rtattr *opt = tca[TCA_OPTIONS-1];
 506         struct rtattr *tb[TCA_U32_MAX];
 507         u32 htid;
 508         int err;
 509
 510         if (opt == NULL)
 511                 return handle ? -EINVAL : 0;
 512
 513         if (rtattr_parse(tb, TCA_U32_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0)
 514                 return -EINVAL;
 515
 516         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 517                 if (TC_U32_KEY(n->handle) == 0)
 518                         return -EINVAL;
 519
 520                 return u32_set_parms(tp->q, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 521         }
 522
 523         if (tb[TCA_U32_DIVISOR-1]) {
 524                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 525
 526                 if (--divisor > 0x100)
 527                         return -EINVAL;
 528                 if (TC_U32_KEY(handle))
 529                         return -EINVAL;
 530                 if (handle == 0) {
 531                         handle = gen_new_htid(tp->data);
 532                         if (handle == 0)
 533                                 return -ENOMEM;
 534                 }
 535                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 536                 if (ht == NULL)
 537                         return -ENOBUFS;
 538                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 539                 ht->tp_c = tp_c;
 540                 ht->refcnt = 0;
 541                 ht->divisor = divisor;
 542                 ht->handle = handle;
 543                 ht->next = tp_c->hlist;
 544                 tp_c->hlist = ht;
 545                 *arg = (unsigned long)ht;
 546                 return 0;
 547         }
 548
 549         if (tb[TCA_U32_HASH-1]) {
 550                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 551                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 552                         ht = tp->root;
 553                         htid = ht->handle;
 554                 } else {
 555                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 556                         if (ht == NULL)
 557                                 return -EINVAL;
 558                 }
 559         } else {
 560                 ht = tp->root;
 561                 htid = ht->handle;
 562         }
 563
 564         if (ht->divisor < TC_U32_HASH(htid))
 565                 return -EINVAL;
 566
 567         if (handle) {
 568                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 569                         return -EINVAL;
 570                 handle = htid | TC_U32_NODE(handle);
 571         } else
 572                 handle = gen_new_kid(ht, htid);
 573
 574         if (tb[TCA_U32_SEL-1] == 0 ||
 575             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 576                 return -EINVAL;
 577
 578         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 579         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 580         if (n == NULL)
 581                 return -ENOBUFS;
 582         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 583         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 584         n->ht_up = ht;
 585         n->handle = handle;
 586         err = u32_set_parms(tp->q, base, ht, n, tb, tca[TCA_RATE-1]);
 587         if (err == 0) {
 588                 struct tc_u_knode **ins;
 589                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 590                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 591                                 break;
 592
 593                 n->next = *ins;
 594                 wmb();
 595                 *ins = n;
 596
 597                 *arg = (unsigned long)n;
 598                 return 0;
 599         }
 600         kfree(n);
 601         return err;
 602 }
 603
 604 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 605 {
 606         struct tc_u_common *tp_c = tp->data;
 607         struct tc_u_hnode *ht;
 608         struct tc_u_knode *n;
 609         unsigned h;
 610
 611         if (arg->stop)
 612                 return;
 613
 614         for (ht = tp_c->hlist; ht; ht = ht->next) {
 615                 if (arg->count >= arg->skip) {
 616                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 617                                 arg->stop = 1;
 618                                 return;
 619                         }
 620                 }
 621                 arg->count++;
 622                 for (h = 0; h <= ht->divisor; h++) {
 623                         for (n = ht->ht[h]; n; n = n->next) {
 624                                 if (arg->count < arg->skip) {
 625                                         arg->count++;
 626                                         continue;
 627                                 }
 628                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 629                                         arg->stop = 1;
 630                                         return;
 631                                 }
 632                                 arg->count++;
 633                         }
 634                 }
 635         }
 636 }
 637
 638 #ifdef CONFIG_RTNETLINK
 639 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 640                      struct sk_buff *skb, struct tcmsg *t)
 641 {
 642         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 643         unsigned char    *b = skb->tail;
 644         struct rtattr *rta;
 645
 646         if (n == NULL)
 647                 return skb->len;
 648
 649         t->tcm_handle = n->handle;
 650
 651         rta = (struct rtattr*)b;
 652         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 653
 654         if (TC_U32_KEY(n->handle) == 0) {
 655                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 656                 u32 divisor = ht->divisor+1;
 657                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 658         } else {
 659                 RTA_PUT(skb, TCA_U32_SEL,
 660                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 661                         &n->sel);
 662                 if (n->ht_up) {
 663                         u32 htid = n->handle & 0xFFFFF000;
 664                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 665                 }
 666                 if (n->res.classid)
 667                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 668                 if (n->ht_down)
 669                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 670 #ifdef CONFIG_NET_CLS_POLICE
 671                 if (n->police) {
 672                         struct rtattr * p_rta = (struct rtattr*)skb->tail;
 673
 674                         RTA_PUT(skb, TCA_U32_POLICE, 0, NULL);
 675
 676                         if (tcf_police_dump(skb, n->police) < 0)
 677                                 goto rtattr_failure;
 678
 679                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 680                 }
 681 #endif
 682         }
 683
 684         rta->rta_len = skb->tail - b;
 685 #ifdef CONFIG_NET_CLS_POLICE
 686         if (TC_U32_KEY(n->handle) && n->police) {
 687                 if (qdisc_copy_stats(skb, &n->police->stats))
 688                         goto rtattr_failure;
 689         }
 690 #endif
 691         return skb->len;
 692
 693 rtattr_failure:
 694         skb_trim(skb, b - skb->data);
 695         return -1;
 696 }
 697 #endif
 698
 699 struct tcf_proto_ops cls_u32_ops = {
 700         NULL,
 701         "u32",
 702         u32_classify,
 703         u32_init,
 704         u32_destroy,
 705
 706         u32_get,
 707         u32_put,
 708         u32_change,
 709         u32_delete,
 710         u32_walk,
 711 #ifdef CONFIG_RTNETLINK
 712         u32_dump
 713 #else
 714         NULL
 715 #endif
 716 };
 717
 718 #ifdef MODULE
 719 int init_module(void)
 720 {
 721         return register_tcf_proto_ops(&cls_u32_ops);
 722 }
 723
 724 void cleanup_module(void)
 725 {
 726         unregister_tcf_proto_ops(&cls_u32_ops);
 727 }
 728 #endif