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  *      JHS: We should remove the CONFIG_NET_CLS_IND from here
  28  *      eventually when the meta match extension is made available
  29  *
  30  *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  31  */
  32
  33 #include <asm/uaccess.h>
  34 #include <asm/system.h>
  35 #include <linux/bitops.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/kernel.h>
  39 #include <linux/string.h>
  40 #include <linux/mm.h>
  41 #include <linux/socket.h>
  42 #include <linux/sockios.h>
  43 #include <linux/in.h>
  44 #include <linux/errno.h>
  45 #include <linux/interrupt.h>
  46 #include <linux/if_ether.h>
  47 #include <linux/inet.h>
  48 #include <linux/netdevice.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/notifier.h>
  51 #include <linux/rtnetlink.h>
  52 #include <net/ip.h>
  53 #include <net/route.h>
  54 #include <linux/skbuff.h>
  55 #include <net/sock.h>
  56 #include <net/act_api.h>
  57 #include <net/pkt_cls.h>
  58
  59 struct tc_u_knode
  60 {
  61         struct tc_u_knode       *next;
  62         u32                     handle;
  63         struct tc_u_hnode       *ht_up;
  64         struct tcf_exts         exts;
  65 #ifdef CONFIG_NET_CLS_IND
  66         char                     indev[IFNAMSIZ];
  67 #endif
  68         u8                      fshift;
  69         struct tcf_result       res;
  70         struct tc_u_hnode       *ht_down;
  71 #ifdef CONFIG_CLS_U32_PERF
  72         struct tc_u32_pcnt      *pf;
  73 #endif
  74 #ifdef CONFIG_CLS_U32_MARK
  75         struct tc_u32_mark      mark;
  76 #endif
  77         struct tc_u32_sel       sel;
  78 };
  79
  80 struct tc_u_hnode
  81 {
  82         struct tc_u_hnode       *next;
  83         u32                     handle;
  84         u32                     prio;
  85         struct tc_u_common      *tp_c;
  86         int                     refcnt;
  87         unsigned                divisor;
  88         struct tc_u_knode       *ht[1];
  89 };
  90
  91 struct tc_u_common
  92 {
  93         struct tc_u_common      *next;
  94         struct tc_u_hnode       *hlist;
  95         struct Qdisc            *q;
  96         int                     refcnt;
  97         u32                     hgenerator;
  98 };
  99
 100 static struct tcf_ext_map u32_ext_map = {
 101         .action = TCA_U32_ACT,
 102         .police = TCA_U32_POLICE
 103 };
 104
 105 static struct tc_u_common *u32_list;
 106
 107 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 108 {
 109         unsigned h = (key & sel->hmask)>>fshift;
 110
 111         return h;
 112 }
 113
 114 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 115 {
 116         struct {
 117                 struct tc_u_knode *knode;
 118                 u8                *ptr;
 119         } stack[TC_U32_MAXDEPTH];
 120
 121         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 122         u8 *ptr = skb->nh.raw;
 123         struct tc_u_knode *n;
 124         int sdepth = 0;
 125         int off2 = 0;
 126         int sel = 0;
 127 #ifdef CONFIG_CLS_U32_PERF
 128         int j;
 129 #endif
 130         int i, r;
 131
 132 next_ht:
 133         n = ht->ht[sel];
 134
 135 next_knode:
 136         if (n) {
 137                 struct tc_u32_key *key = n->sel.keys;
 138
 139 #ifdef CONFIG_CLS_U32_PERF
 140                 n->pf->rcnt +=1;
 141                 j = 0;
 142 #endif
 143
 144 #ifdef CONFIG_CLS_U32_MARK
 145                 if ((skb->mark & n->mark.mask) != n->mark.val) {
 146                         n = n->next;
 147                         goto next_knode;
 148                 } else {
 149                         n->mark.success++;
 150                 }
 151 #endif
 152
 153                 for (i = n->sel.nkeys; i>0; i--, key++) {
 154
 155                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 156                                 n = n->next;
 157                                 goto next_knode;
 158                         }
 159 #ifdef CONFIG_CLS_U32_PERF
 160                         n->pf->kcnts[j] +=1;
 161                         j++;
 162 #endif
 163                 }
 164                 if (n->ht_down == NULL) {
 165 check_terminal:
 166                         if (n->sel.flags&TC_U32_TERMINAL) {
 167
 168                                 *res = n->res;
 169 #ifdef CONFIG_NET_CLS_IND
 170                                 if (!tcf_match_indev(skb, n->indev)) {
 171                                         n = n->next;
 172                                         goto next_knode;
 173                                 }
 174 #endif
 175 #ifdef CONFIG_CLS_U32_PERF
 176                                 n->pf->rhit +=1;
 177 #endif
 178                                 r = tcf_exts_exec(skb, &n->exts, res);
 179                                 if (r < 0) {
 180                                         n = n->next;
 181                                         goto next_knode;
 182                                 }
 183
 184                                 return r;
 185                         }
 186                         n = n->next;
 187                         goto next_knode;
 188                 }
 189
 190                 /* PUSH */
 191                 if (sdepth >= TC_U32_MAXDEPTH)
 192                         goto deadloop;
 193                 stack[sdepth].knode = n;
 194                 stack[sdepth].ptr = ptr;
 195                 sdepth++;
 196
 197                 ht = n->ht_down;
 198                 sel = 0;
 199                 if (ht->divisor)
 200                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 201
 202                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 203                         goto next_ht;
 204
 205                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 206                         off2 = n->sel.off + 3;
 207                         if (n->sel.flags&TC_U32_VAROFFSET)
 208                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 209                         off2 &= ~3;
 210                 }
 211                 if (n->sel.flags&TC_U32_EAT) {
 212                         ptr += off2;
 213                         off2 = 0;
 214                 }
 215
 216                 if (ptr < skb->tail)
 217                         goto next_ht;
 218         }
 219
 220         /* POP */
 221         if (sdepth--) {
 222                 n = stack[sdepth].knode;
 223                 ht = n->ht_up;
 224                 ptr = stack[sdepth].ptr;
 225                 goto check_terminal;
 226         }
 227         return -1;
 228
 229 deadloop:
 230         if (net_ratelimit())
 231                 printk("cls_u32: dead loop\n");
 232         return -1;
 233 }
 234
 235 static __inline__ struct tc_u_hnode *
 236 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 237 {
 238         struct tc_u_hnode *ht;
 239
 240         for (ht = tp_c->hlist; ht; ht = ht->next)
 241                 if (ht->handle == handle)
 242                         break;
 243
 244         return ht;
 245 }
 246
 247 static __inline__ struct tc_u_knode *
 248 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 249 {
 250         unsigned sel;
 251         struct tc_u_knode *n = NULL;
 252
 253         sel = TC_U32_HASH(handle);
 254         if (sel > ht->divisor)
 255                 goto out;
 256
 257         for (n = ht->ht[sel]; n; n = n->next)
 258                 if (n->handle == handle)
 259                         break;
 260 out:
 261         return n;
 262 }
 263
 264
 265 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 266 {
 267         struct tc_u_hnode *ht;
 268         struct tc_u_common *tp_c = tp->data;
 269
 270         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 271                 ht = tp->root;
 272         else
 273                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 274
 275         if (!ht)
 276                 return 0;
 277
 278         if (TC_U32_KEY(handle) == 0)
 279                 return (unsigned long)ht;
 280
 281         return (unsigned long)u32_lookup_key(ht, handle);
 282 }
 283
 284 static void u32_put(struct tcf_proto *tp, unsigned long f)
 285 {
 286 }
 287
 288 static u32 gen_new_htid(struct tc_u_common *tp_c)
 289 {
 290         int i = 0x800;
 291
 292         do {
 293                 if (++tp_c->hgenerator == 0x7FF)
 294                         tp_c->hgenerator = 1;
 295         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 296
 297         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 298 }
 299
 300 static int u32_init(struct tcf_proto *tp)
 301 {
 302         struct tc_u_hnode *root_ht;
 303         struct tc_u_common *tp_c;
 304
 305         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 306                 if (tp_c->q == tp->q)
 307                         break;
 308
 309         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 310         if (root_ht == NULL)
 311                 return -ENOBUFS;
 312
 313         root_ht->divisor = 0;
 314         root_ht->refcnt++;
 315         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 316         root_ht->prio = tp->prio;
 317
 318         if (tp_c == NULL) {
 319                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 320                 if (tp_c == NULL) {
 321                         kfree(root_ht);
 322                         return -ENOBUFS;
 323                 }
 324                 tp_c->q = tp->q;
 325                 tp_c->next = u32_list;
 326                 u32_list = tp_c;
 327         }
 328
 329         tp_c->refcnt++;
 330         root_ht->next = tp_c->hlist;
 331         tp_c->hlist = root_ht;
 332         root_ht->tp_c = tp_c;
 333
 334         tp->root = root_ht;
 335         tp->data = tp_c;
 336         return 0;
 337 }
 338
 339 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 340 {
 341         tcf_unbind_filter(tp, &n->res);
 342         tcf_exts_destroy(tp, &n->exts);
 343         if (n->ht_down)
 344                 n->ht_down->refcnt--;
 345 #ifdef CONFIG_CLS_U32_PERF
 346         kfree(n->pf);
 347 #endif
 348         kfree(n);
 349         return 0;
 350 }
 351
 352 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 353 {
 354         struct tc_u_knode **kp;
 355         struct tc_u_hnode *ht = key->ht_up;
 356
 357         if (ht) {
 358                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 359                         if (*kp == key) {
 360                                 tcf_tree_lock(tp);
 361                                 *kp = key->next;
 362                                 tcf_tree_unlock(tp);
 363
 364                                 u32_destroy_key(tp, key);
 365                                 return 0;
 366                         }
 367                 }
 368         }
 369         BUG_TRAP(0);
 370         return 0;
 371 }
 372
 373 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 374 {
 375         struct tc_u_knode *n;
 376         unsigned h;
 377
 378         for (h=0; h<=ht->divisor; h++) {
 379                 while ((n = ht->ht[h]) != NULL) {
 380                         ht->ht[h] = n->next;
 381
 382                         u32_destroy_key(tp, n);
 383                 }
 384         }
 385 }
 386
 387 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 388 {
 389         struct tc_u_common *tp_c = tp->data;
 390         struct tc_u_hnode **hn;
 391
 392         BUG_TRAP(!ht->refcnt);
 393
 394         u32_clear_hnode(tp, ht);
 395
 396         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 397                 if (*hn == ht) {
 398                         *hn = ht->next;
 399                         kfree(ht);
 400                         return 0;
 401                 }
 402         }
 403
 404         BUG_TRAP(0);
 405         return -ENOENT;
 406 }
 407
 408 static void u32_destroy(struct tcf_proto *tp)
 409 {
 410         struct tc_u_common *tp_c = tp->data;
 411         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 412
 413         BUG_TRAP(root_ht != NULL);
 414
 415         if (root_ht && --root_ht->refcnt == 0)
 416                 u32_destroy_hnode(tp, root_ht);
 417
 418         if (--tp_c->refcnt == 0) {
 419                 struct tc_u_hnode *ht;
 420                 struct tc_u_common **tp_cp;
 421
 422                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 423                         if (*tp_cp == tp_c) {
 424                                 *tp_cp = tp_c->next;
 425                                 break;
 426                         }
 427                 }
 428
 429                 for (ht=tp_c->hlist; ht; ht = ht->next)
 430                         u32_clear_hnode(tp, ht);
 431
 432                 while ((ht = tp_c->hlist) != NULL) {
 433                         tp_c->hlist = ht->next;
 434
 435                         BUG_TRAP(ht->refcnt == 0);
 436
 437                         kfree(ht);
 438                 };
 439
 440                 kfree(tp_c);
 441         }
 442
 443         tp->data = NULL;
 444 }
 445
 446 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 447 {
 448         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 449
 450         if (ht == NULL)
 451                 return 0;
 452
 453         if (TC_U32_KEY(ht->handle))
 454                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 455
 456         if (tp->root == ht)
 457                 return -EINVAL;
 458
 459         if (--ht->refcnt == 0)
 460                 u32_destroy_hnode(tp, ht);
 461
 462         return 0;
 463 }
 464
 465 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 466 {
 467         struct tc_u_knode *n;
 468         unsigned i = 0x7FF;
 469
 470         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 471                 if (i < TC_U32_NODE(n->handle))
 472                         i = TC_U32_NODE(n->handle);
 473         i++;
 474
 475         return handle|(i>0xFFF ? 0xFFF : i);
 476 }
 477
 478 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 479                          struct tc_u_hnode *ht,
 480                          struct tc_u_knode *n, struct rtattr **tb,
 481                          struct rtattr *est)
 482 {
 483         int err;
 484         struct tcf_exts e;
 485
 486         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 487         if (err < 0)
 488                 return err;
 489
 490         err = -EINVAL;
 491         if (tb[TCA_U32_LINK-1]) {
 492                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 493                 struct tc_u_hnode *ht_down = NULL;
 494
 495                 if (TC_U32_KEY(handle))
 496                         goto errout;
 497
 498                 if (handle) {
 499                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 500
 501                         if (ht_down == NULL)
 502                                 goto errout;
 503                         ht_down->refcnt++;
 504                 }
 505
 506                 tcf_tree_lock(tp);
 507                 ht_down = xchg(&n->ht_down, ht_down);
 508                 tcf_tree_unlock(tp);
 509
 510                 if (ht_down)
 511                         ht_down->refcnt--;
 512         }
 513         if (tb[TCA_U32_CLASSID-1]) {
 514                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 515                 tcf_bind_filter(tp, &n->res, base);
 516         }
 517
 518 #ifdef CONFIG_NET_CLS_IND
 519         if (tb[TCA_U32_INDEV-1]) {
 520                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 521                 if (err < 0)
 522                         goto errout;
 523         }
 524 #endif
 525         tcf_exts_change(tp, &n->exts, &e);
 526
 527         return 0;
 528 errout:
 529         tcf_exts_destroy(tp, &e);
 530         return err;
 531 }
 532
 533 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 534                       struct rtattr **tca,
 535                       unsigned long *arg)
 536 {
 537         struct tc_u_common *tp_c = tp->data;
 538         struct tc_u_hnode *ht;
 539         struct tc_u_knode *n;
 540         struct tc_u32_sel *s;
 541         struct rtattr *opt = tca[TCA_OPTIONS-1];
 542         struct rtattr *tb[TCA_U32_MAX];
 543         u32 htid;
 544         int err;
 545
 546         if (opt == NULL)
 547                 return handle ? -EINVAL : 0;
 548
 549         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
 550                 return -EINVAL;
 551
 552         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 553                 if (TC_U32_KEY(n->handle) == 0)
 554                         return -EINVAL;
 555
 556                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 557         }
 558
 559         if (tb[TCA_U32_DIVISOR-1]) {
 560                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 561
 562                 if (--divisor > 0x100)
 563                         return -EINVAL;
 564                 if (TC_U32_KEY(handle))
 565                         return -EINVAL;
 566                 if (handle == 0) {
 567                         handle = gen_new_htid(tp->data);
 568                         if (handle == 0)
 569                                 return -ENOMEM;
 570                 }
 571                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 572                 if (ht == NULL)
 573                         return -ENOBUFS;
 574                 ht->tp_c = tp_c;
 575                 ht->refcnt = 0;
 576                 ht->divisor = divisor;
 577                 ht->handle = handle;
 578                 ht->prio = tp->prio;
 579                 ht->next = tp_c->hlist;
 580                 tp_c->hlist = ht;
 581                 *arg = (unsigned long)ht;
 582                 return 0;
 583         }
 584
 585         if (tb[TCA_U32_HASH-1]) {
 586                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 587                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 588                         ht = tp->root;
 589                         htid = ht->handle;
 590                 } else {
 591                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 592                         if (ht == NULL)
 593                                 return -EINVAL;
 594                 }
 595         } else {
 596                 ht = tp->root;
 597                 htid = ht->handle;
 598         }
 599
 600         if (ht->divisor < TC_U32_HASH(htid))
 601                 return -EINVAL;
 602
 603         if (handle) {
 604                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 605                         return -EINVAL;
 606                 handle = htid | TC_U32_NODE(handle);
 607         } else
 608                 handle = gen_new_kid(ht, htid);
 609
 610         if (tb[TCA_U32_SEL-1] == 0 ||
 611             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 612                 return -EINVAL;
 613
 614         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 615
 616         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 617         if (n == NULL)
 618                 return -ENOBUFS;
 619
 620 #ifdef CONFIG_CLS_U32_PERF
 621         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 622         if (n->pf == NULL) {
 623                 kfree(n);
 624                 return -ENOBUFS;
 625         }
 626 #endif
 627
 628         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 629         n->ht_up = ht;
 630         n->handle = handle;
 631 {
 632         u8 i = 0;
 633         u32 mask = s->hmask;
 634         if (mask) {
 635                 while (!(mask & 1)) {
 636                         i++;
 637                         mask>>=1;
 638                 }
 639         }
 640         n->fshift = i;
 641 }
 642
 643 #ifdef CONFIG_CLS_U32_MARK
 644         if (tb[TCA_U32_MARK-1]) {
 645                 struct tc_u32_mark *mark;
 646
 647                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
 648 #ifdef CONFIG_CLS_U32_PERF
 649                         kfree(n->pf);
 650 #endif
 651                         kfree(n);
 652                         return -EINVAL;
 653                 }
 654                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
 655                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 656                 n->mark.success = 0;
 657         }
 658 #endif
 659
 660         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 661         if (err == 0) {
 662                 struct tc_u_knode **ins;
 663                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 664                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 665                                 break;
 666
 667                 n->next = *ins;
 668                 wmb();
 669                 *ins = n;
 670
 671                 *arg = (unsigned long)n;
 672                 return 0;
 673         }
 674 #ifdef CONFIG_CLS_U32_PERF
 675         kfree(n->pf);
 676 #endif
 677         kfree(n);
 678         return err;
 679 }
 680
 681 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 682 {
 683         struct tc_u_common *tp_c = tp->data;
 684         struct tc_u_hnode *ht;
 685         struct tc_u_knode *n;
 686         unsigned h;
 687
 688         if (arg->stop)
 689                 return;
 690
 691         for (ht = tp_c->hlist; ht; ht = ht->next) {
 692                 if (ht->prio != tp->prio)
 693                         continue;
 694                 if (arg->count >= arg->skip) {
 695                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 696                                 arg->stop = 1;
 697                                 return;
 698                         }
 699                 }
 700                 arg->count++;
 701                 for (h = 0; h <= ht->divisor; h++) {
 702                         for (n = ht->ht[h]; n; n = n->next) {
 703                                 if (arg->count < arg->skip) {
 704                                         arg->count++;
 705                                         continue;
 706                                 }
 707                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 708                                         arg->stop = 1;
 709                                         return;
 710                                 }
 711                                 arg->count++;
 712                         }
 713                 }
 714         }
 715 }
 716
 717 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 718                      struct sk_buff *skb, struct tcmsg *t)
 719 {
 720         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 721         unsigned char    *b = skb->tail;
 722         struct rtattr *rta;
 723
 724         if (n == NULL)
 725                 return skb->len;
 726
 727         t->tcm_handle = n->handle;
 728
 729         rta = (struct rtattr*)b;
 730         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 731
 732         if (TC_U32_KEY(n->handle) == 0) {
 733                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 734                 u32 divisor = ht->divisor+1;
 735                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 736         } else {
 737                 RTA_PUT(skb, TCA_U32_SEL,
 738                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 739                         &n->sel);
 740                 if (n->ht_up) {
 741                         u32 htid = n->handle & 0xFFFFF000;
 742                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 743                 }
 744                 if (n->res.classid)
 745                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 746                 if (n->ht_down)
 747                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 748
 749 #ifdef CONFIG_CLS_U32_MARK
 750                 if (n->mark.val || n->mark.mask)
 751                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 752 #endif
 753
 754                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 755                         goto rtattr_failure;
 756
 757 #ifdef CONFIG_NET_CLS_IND
 758                 if(strlen(n->indev))
 759                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 760 #endif
 761 #ifdef CONFIG_CLS_U32_PERF
 762                 RTA_PUT(skb, TCA_U32_PCNT,
 763                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 764                         n->pf);
 765 #endif
 766         }
 767
 768         rta->rta_len = skb->tail - b;
 769         if (TC_U32_KEY(n->handle))
 770                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 771                         goto rtattr_failure;
 772         return skb->len;
 773
 774 rtattr_failure:
 775         skb_trim(skb, b - skb->data);
 776         return -1;
 777 }
 778
 779 static struct tcf_proto_ops cls_u32_ops = {
 780         .next           =       NULL,
 781         .kind           =       "u32",
 782         .classify       =       u32_classify,
 783         .init           =       u32_init,
 784         .destroy        =       u32_destroy,
 785         .get            =       u32_get,
 786         .put            =       u32_put,
 787         .change         =       u32_change,
 788         .delete         =       u32_delete,
 789         .walk           =       u32_walk,
 790         .dump           =       u32_dump,
 791         .owner          =       THIS_MODULE,
 792 };
 793
 794 static int __init init_u32(void)
 795 {
 796         printk("u32 classifier\n");
 797 #ifdef CONFIG_CLS_U32_PERF
 798         printk("    Performance counters on\n");
 799 #endif
 800 #ifdef CONFIG_NET_CLS_POLICE
 801         printk("    OLD policer on \n");
 802 #endif
 803 #ifdef CONFIG_NET_CLS_IND
 804         printk("    input device check on \n");
 805 #endif
 806 #ifdef CONFIG_NET_CLS_ACT
 807         printk("    Actions configured \n");
 808 #endif
 809         return register_tcf_proto_ops(&cls_u32_ops);
 810 }
 811
 812 static void __exit exit_u32(void)
 813 {
 814         unregister_tcf_proto_ops(&cls_u32_ops);
 815 }
 816
 817 module_init(init_u32)
 818 module_exit(exit_u32)
 819 MODULE_LICENSE("GPL");