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   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/config.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/kernel.h>
  40 #include <linux/sched.h>
  41 #include <linux/string.h>
  42 #include <linux/mm.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/in.h>
  46 #include <linux/errno.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/if_ether.h>
  49 #include <linux/inet.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/etherdevice.h>
  52 #include <linux/notifier.h>
  53 #include <linux/rtnetlink.h>
  54 #include <net/ip.h>
  55 #include <net/route.h>
  56 #include <linux/skbuff.h>
  57 #include <net/sock.h>
  58 #include <net/act_api.h>
  59 #include <net/pkt_cls.h>
  60
  61 struct tc_u_knode
  62 {
  63         struct tc_u_knode       *next;
  64         u32                     handle;
  65         struct tc_u_hnode       *ht_up;
  66         struct tcf_exts         exts;
  67 #ifdef CONFIG_NET_CLS_IND
  68         char                     indev[IFNAMSIZ];
  69 #endif
  70         u8                      fshift;
  71         struct tcf_result       res;
  72         struct tc_u_hnode       *ht_down;
  73 #ifdef CONFIG_CLS_U32_PERF
  74         struct tc_u32_pcnt      *pf;
  75 #endif
  76 #ifdef CONFIG_CLS_U32_MARK
  77         struct tc_u32_mark      mark;
  78 #endif
  79         struct tc_u32_sel       sel;
  80 };
  81
  82 struct tc_u_hnode
  83 {
  84         struct tc_u_hnode       *next;
  85         u32                     handle;
  86         u32                     prio;
  87         struct tc_u_common      *tp_c;
  88         int                     refcnt;
  89         unsigned                divisor;
  90         struct tc_u_knode       *ht[1];
  91 };
  92
  93 struct tc_u_common
  94 {
  95         struct tc_u_common      *next;
  96         struct tc_u_hnode       *hlist;
  97         struct Qdisc            *q;
  98         int                     refcnt;
  99         u32                     hgenerator;
 100 };
 101
 102 static struct tcf_ext_map u32_ext_map = {
 103         .action = TCA_U32_ACT,
 104         .police = TCA_U32_POLICE
 105 };
 106
 107 static struct tc_u_common *u32_list;
 108
 109 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 110 {
 111         unsigned h = (key & sel->hmask)>>fshift;
 112
 113         return h;
 114 }
 115
 116 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 117 {
 118         struct {
 119                 struct tc_u_knode *knode;
 120                 u8                *ptr;
 121         } stack[TC_U32_MAXDEPTH];
 122
 123         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 124         u8 *ptr = skb->nh.raw;
 125         struct tc_u_knode *n;
 126         int sdepth = 0;
 127         int off2 = 0;
 128         int sel = 0;
 129 #ifdef CONFIG_CLS_U32_PERF
 130         int j;
 131 #endif
 132         int i, r;
 133
 134 next_ht:
 135         n = ht->ht[sel];
 136
 137 next_knode:
 138         if (n) {
 139                 struct tc_u32_key *key = n->sel.keys;
 140
 141 #ifdef CONFIG_CLS_U32_PERF
 142                 n->pf->rcnt +=1;
 143                 j = 0;
 144 #endif
 145
 146 #ifdef CONFIG_CLS_U32_MARK
 147                 if ((skb->nfmark & n->mark.mask) != n->mark.val) {
 148                         n = n->next;
 149                         goto next_knode;
 150                 } else {
 151                         n->mark.success++;
 152                 }
 153 #endif
 154
 155                 for (i = n->sel.nkeys; i>0; i--, key++) {
 156
 157                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 158                                 n = n->next;
 159                                 goto next_knode;
 160                         }
 161 #ifdef CONFIG_CLS_U32_PERF
 162                         n->pf->kcnts[j] +=1;
 163                         j++;
 164 #endif
 165                 }
 166                 if (n->ht_down == NULL) {
 167 check_terminal:
 168                         if (n->sel.flags&TC_U32_TERMINAL) {
 169
 170                                 *res = n->res;
 171 #ifdef CONFIG_NET_CLS_IND
 172                                 if (!tcf_match_indev(skb, n->indev)) {
 173                                         n = n->next;
 174                                         goto next_knode;
 175                                 }
 176 #endif
 177 #ifdef CONFIG_CLS_U32_PERF
 178                                 n->pf->rhit +=1;
 179 #endif
 180                                 r = tcf_exts_exec(skb, &n->exts, res);
 181                                 if (r < 0) {
 182                                         n = n->next;
 183                                         goto next_knode;
 184                                 }
 185
 186                                 return r;
 187                         }
 188                         n = n->next;
 189                         goto next_knode;
 190                 }
 191
 192                 /* PUSH */
 193                 if (sdepth >= TC_U32_MAXDEPTH)
 194                         goto deadloop;
 195                 stack[sdepth].knode = n;
 196                 stack[sdepth].ptr = ptr;
 197                 sdepth++;
 198
 199                 ht = n->ht_down;
 200                 sel = 0;
 201                 if (ht->divisor)
 202                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 203
 204                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 205                         goto next_ht;
 206
 207                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 208                         off2 = n->sel.off + 3;
 209                         if (n->sel.flags&TC_U32_VAROFFSET)
 210                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 211                         off2 &= ~3;
 212                 }
 213                 if (n->sel.flags&TC_U32_EAT) {
 214                         ptr += off2;
 215                         off2 = 0;
 216                 }
 217
 218                 if (ptr < skb->tail)
 219                         goto next_ht;
 220         }
 221
 222         /* POP */
 223         if (sdepth--) {
 224                 n = stack[sdepth].knode;
 225                 ht = n->ht_up;
 226                 ptr = stack[sdepth].ptr;
 227                 goto check_terminal;
 228         }
 229         return -1;
 230
 231 deadloop:
 232         if (net_ratelimit())
 233                 printk("cls_u32: dead loop\n");
 234         return -1;
 235 }
 236
 237 static __inline__ struct tc_u_hnode *
 238 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 239 {
 240         struct tc_u_hnode *ht;
 241
 242         for (ht = tp_c->hlist; ht; ht = ht->next)
 243                 if (ht->handle == handle)
 244                         break;
 245
 246         return ht;
 247 }
 248
 249 static __inline__ struct tc_u_knode *
 250 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 251 {
 252         unsigned sel;
 253         struct tc_u_knode *n = NULL;
 254
 255         sel = TC_U32_HASH(handle);
 256         if (sel > ht->divisor)
 257                 goto out;
 258
 259         for (n = ht->ht[sel]; n; n = n->next)
 260                 if (n->handle == handle)
 261                         break;
 262 out:
 263         return n;
 264 }
 265
 266
 267 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 268 {
 269         struct tc_u_hnode *ht;
 270         struct tc_u_common *tp_c = tp->data;
 271
 272         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 273                 ht = tp->root;
 274         else
 275                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 276
 277         if (!ht)
 278                 return 0;
 279
 280         if (TC_U32_KEY(handle) == 0)
 281                 return (unsigned long)ht;
 282
 283         return (unsigned long)u32_lookup_key(ht, handle);
 284 }
 285
 286 static void u32_put(struct tcf_proto *tp, unsigned long f)
 287 {
 288 }
 289
 290 static u32 gen_new_htid(struct tc_u_common *tp_c)
 291 {
 292         int i = 0x800;
 293
 294         do {
 295                 if (++tp_c->hgenerator == 0x7FF)
 296                         tp_c->hgenerator = 1;
 297         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 298
 299         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 300 }
 301
 302 static int u32_init(struct tcf_proto *tp)
 303 {
 304         struct tc_u_hnode *root_ht;
 305         struct tc_u_common *tp_c;
 306
 307         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 308                 if (tp_c->q == tp->q)
 309                         break;
 310
 311         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 312         if (root_ht == NULL)
 313                 return -ENOBUFS;
 314
 315         memset(root_ht, 0, sizeof(*root_ht));
 316         root_ht->divisor = 0;
 317         root_ht->refcnt++;
 318         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 319         root_ht->prio = tp->prio;
 320
 321         if (tp_c == NULL) {
 322                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 323                 if (tp_c == NULL) {
 324                         kfree(root_ht);
 325                         return -ENOBUFS;
 326                 }
 327                 memset(tp_c, 0, sizeof(*tp_c));
 328                 tp_c->q = tp->q;
 329                 tp_c->next = u32_list;
 330                 u32_list = tp_c;
 331         }
 332
 333         tp_c->refcnt++;
 334         root_ht->next = tp_c->hlist;
 335         tp_c->hlist = root_ht;
 336         root_ht->tp_c = tp_c;
 337
 338         tp->root = root_ht;
 339         tp->data = tp_c;
 340         return 0;
 341 }
 342
 343 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 344 {
 345         tcf_unbind_filter(tp, &n->res);
 346         tcf_exts_destroy(tp, &n->exts);
 347         if (n->ht_down)
 348                 n->ht_down->refcnt--;
 349 #ifdef CONFIG_CLS_U32_PERF
 350         if (n && (NULL != n->pf))
 351                 kfree(n->pf);
 352 #endif
 353         kfree(n);
 354         return 0;
 355 }
 356
 357 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 358 {
 359         struct tc_u_knode **kp;
 360         struct tc_u_hnode *ht = key->ht_up;
 361
 362         if (ht) {
 363                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 364                         if (*kp == key) {
 365                                 tcf_tree_lock(tp);
 366                                 *kp = key->next;
 367                                 tcf_tree_unlock(tp);
 368
 369                                 u32_destroy_key(tp, key);
 370                                 return 0;
 371                         }
 372                 }
 373         }
 374         BUG_TRAP(0);
 375         return 0;
 376 }
 377
 378 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 379 {
 380         struct tc_u_knode *n;
 381         unsigned h;
 382
 383         for (h=0; h<=ht->divisor; h++) {
 384                 while ((n = ht->ht[h]) != NULL) {
 385                         ht->ht[h] = n->next;
 386
 387                         u32_destroy_key(tp, n);
 388                 }
 389         }
 390 }
 391
 392 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 393 {
 394         struct tc_u_common *tp_c = tp->data;
 395         struct tc_u_hnode **hn;
 396
 397         BUG_TRAP(!ht->refcnt);
 398
 399         u32_clear_hnode(tp, ht);
 400
 401         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 402                 if (*hn == ht) {
 403                         *hn = ht->next;
 404                         kfree(ht);
 405                         return 0;
 406                 }
 407         }
 408
 409         BUG_TRAP(0);
 410         return -ENOENT;
 411 }
 412
 413 static void u32_destroy(struct tcf_proto *tp)
 414 {
 415         struct tc_u_common *tp_c = tp->data;
 416         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 417
 418         BUG_TRAP(root_ht != NULL);
 419
 420         if (root_ht && --root_ht->refcnt == 0)
 421                 u32_destroy_hnode(tp, root_ht);
 422
 423         if (--tp_c->refcnt == 0) {
 424                 struct tc_u_hnode *ht;
 425                 struct tc_u_common **tp_cp;
 426
 427                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 428                         if (*tp_cp == tp_c) {
 429                                 *tp_cp = tp_c->next;
 430                                 break;
 431                         }
 432                 }
 433
 434                 for (ht=tp_c->hlist; ht; ht = ht->next)
 435                         u32_clear_hnode(tp, ht);
 436
 437                 while ((ht = tp_c->hlist) != NULL) {
 438                         tp_c->hlist = ht->next;
 439
 440                         BUG_TRAP(ht->refcnt == 0);
 441
 442                         kfree(ht);
 443                 };
 444
 445                 kfree(tp_c);
 446         }
 447
 448         tp->data = NULL;
 449 }
 450
 451 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 452 {
 453         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 454
 455         if (ht == NULL)
 456                 return 0;
 457
 458         if (TC_U32_KEY(ht->handle))
 459                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 460
 461         if (tp->root == ht)
 462                 return -EINVAL;
 463
 464         if (--ht->refcnt == 0)
 465                 u32_destroy_hnode(tp, ht);
 466
 467         return 0;
 468 }
 469
 470 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 471 {
 472         struct tc_u_knode *n;
 473         unsigned i = 0x7FF;
 474
 475         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 476                 if (i < TC_U32_NODE(n->handle))
 477                         i = TC_U32_NODE(n->handle);
 478         i++;
 479
 480         return handle|(i>0xFFF ? 0xFFF : i);
 481 }
 482
 483 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 484                          struct tc_u_hnode *ht,
 485                          struct tc_u_knode *n, struct rtattr **tb,
 486                          struct rtattr *est)
 487 {
 488         int err;
 489         struct tcf_exts e;
 490
 491         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 492         if (err < 0)
 493                 return err;
 494
 495         err = -EINVAL;
 496         if (tb[TCA_U32_LINK-1]) {
 497                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 498                 struct tc_u_hnode *ht_down = NULL;
 499
 500                 if (TC_U32_KEY(handle))
 501                         goto errout;
 502
 503                 if (handle) {
 504                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 505
 506                         if (ht_down == NULL)
 507                                 goto errout;
 508                         ht_down->refcnt++;
 509                 }
 510
 511                 tcf_tree_lock(tp);
 512                 ht_down = xchg(&n->ht_down, ht_down);
 513                 tcf_tree_unlock(tp);
 514
 515                 if (ht_down)
 516                         ht_down->refcnt--;
 517         }
 518         if (tb[TCA_U32_CLASSID-1]) {
 519                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 520                 tcf_bind_filter(tp, &n->res, base);
 521         }
 522
 523 #ifdef CONFIG_NET_CLS_IND
 524         if (tb[TCA_U32_INDEV-1]) {
 525                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 526                 if (err < 0)
 527                         goto errout;
 528         }
 529 #endif
 530         tcf_exts_change(tp, &n->exts, &e);
 531
 532         return 0;
 533 errout:
 534         tcf_exts_destroy(tp, &e);
 535         return err;
 536 }
 537
 538 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 539                       struct rtattr **tca,
 540                       unsigned long *arg)
 541 {
 542         struct tc_u_common *tp_c = tp->data;
 543         struct tc_u_hnode *ht;
 544         struct tc_u_knode *n;
 545         struct tc_u32_sel *s;
 546         struct rtattr *opt = tca[TCA_OPTIONS-1];
 547         struct rtattr *tb[TCA_U32_MAX];
 548         u32 htid;
 549         int err;
 550
 551         if (opt == NULL)
 552                 return handle ? -EINVAL : 0;
 553
 554         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
 555                 return -EINVAL;
 556
 557         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 558                 if (TC_U32_KEY(n->handle) == 0)
 559                         return -EINVAL;
 560
 561                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 562         }
 563
 564         if (tb[TCA_U32_DIVISOR-1]) {
 565                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 566
 567                 if (--divisor > 0x100)
 568                         return -EINVAL;
 569                 if (TC_U32_KEY(handle))
 570                         return -EINVAL;
 571                 if (handle == 0) {
 572                         handle = gen_new_htid(tp->data);
 573                         if (handle == 0)
 574                                 return -ENOMEM;
 575                 }
 576                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 577                 if (ht == NULL)
 578                         return -ENOBUFS;
 579                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 580                 ht->tp_c = tp_c;
 581                 ht->refcnt = 0;
 582                 ht->divisor = divisor;
 583                 ht->handle = handle;
 584                 ht->prio = tp->prio;
 585                 ht->next = tp_c->hlist;
 586                 tp_c->hlist = ht;
 587                 *arg = (unsigned long)ht;
 588                 return 0;
 589         }
 590
 591         if (tb[TCA_U32_HASH-1]) {
 592                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 593                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 594                         ht = tp->root;
 595                         htid = ht->handle;
 596                 } else {
 597                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 598                         if (ht == NULL)
 599                                 return -EINVAL;
 600                 }
 601         } else {
 602                 ht = tp->root;
 603                 htid = ht->handle;
 604         }
 605
 606         if (ht->divisor < TC_U32_HASH(htid))
 607                 return -EINVAL;
 608
 609         if (handle) {
 610                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 611                         return -EINVAL;
 612                 handle = htid | TC_U32_NODE(handle);
 613         } else
 614                 handle = gen_new_kid(ht, htid);
 615
 616         if (tb[TCA_U32_SEL-1] == 0 ||
 617             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 618                 return -EINVAL;
 619
 620         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 621
 622         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 623         if (n == NULL)
 624                 return -ENOBUFS;
 625
 626         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 627 #ifdef CONFIG_CLS_U32_PERF
 628         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 629         if (n->pf == NULL) {
 630                 kfree(n);
 631                 return -ENOBUFS;
 632         }
 633         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
 634 #endif
 635
 636         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 637         n->ht_up = ht;
 638         n->handle = handle;
 639 {
 640         u8 i = 0;
 641         u32 mask = s->hmask;
 642         if (mask) {
 643                 while (!(mask & 1)) {
 644                         i++;
 645                         mask>>=1;
 646                 }
 647         }
 648         n->fshift = i;
 649 }
 650
 651 #ifdef CONFIG_CLS_U32_MARK
 652         if (tb[TCA_U32_MARK-1]) {
 653                 struct tc_u32_mark *mark;
 654
 655                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
 656 #ifdef CONFIG_CLS_U32_PERF
 657                         kfree(n->pf);
 658 #endif
 659                         kfree(n);
 660                         return -EINVAL;
 661                 }
 662                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
 663                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 664                 n->mark.success = 0;
 665         }
 666 #endif
 667
 668         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 669         if (err == 0) {
 670                 struct tc_u_knode **ins;
 671                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 672                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 673                                 break;
 674
 675                 n->next = *ins;
 676                 wmb();
 677                 *ins = n;
 678
 679                 *arg = (unsigned long)n;
 680                 return 0;
 681         }
 682 #ifdef CONFIG_CLS_U32_PERF
 683         if (n && (NULL != n->pf))
 684                 kfree(n->pf);
 685 #endif
 686         kfree(n);
 687         return err;
 688 }
 689
 690 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 691 {
 692         struct tc_u_common *tp_c = tp->data;
 693         struct tc_u_hnode *ht;
 694         struct tc_u_knode *n;
 695         unsigned h;
 696
 697         if (arg->stop)
 698                 return;
 699
 700         for (ht = tp_c->hlist; ht; ht = ht->next) {
 701                 if (ht->prio != tp->prio)
 702                         continue;
 703                 if (arg->count >= arg->skip) {
 704                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 705                                 arg->stop = 1;
 706                                 return;
 707                         }
 708                 }
 709                 arg->count++;
 710                 for (h = 0; h <= ht->divisor; h++) {
 711                         for (n = ht->ht[h]; n; n = n->next) {
 712                                 if (arg->count < arg->skip) {
 713                                         arg->count++;
 714                                         continue;
 715                                 }
 716                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 717                                         arg->stop = 1;
 718                                         return;
 719                                 }
 720                                 arg->count++;
 721                         }
 722                 }
 723         }
 724 }
 725
 726 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 727                      struct sk_buff *skb, struct tcmsg *t)
 728 {
 729         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 730         unsigned char    *b = skb->tail;
 731         struct rtattr *rta;
 732
 733         if (n == NULL)
 734                 return skb->len;
 735
 736         t->tcm_handle = n->handle;
 737
 738         rta = (struct rtattr*)b;
 739         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 740
 741         if (TC_U32_KEY(n->handle) == 0) {
 742                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 743                 u32 divisor = ht->divisor+1;
 744                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 745         } else {
 746                 RTA_PUT(skb, TCA_U32_SEL,
 747                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 748                         &n->sel);
 749                 if (n->ht_up) {
 750                         u32 htid = n->handle & 0xFFFFF000;
 751                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 752                 }
 753                 if (n->res.classid)
 754                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 755                 if (n->ht_down)
 756                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 757
 758 #ifdef CONFIG_CLS_U32_MARK
 759                 if (n->mark.val || n->mark.mask)
 760                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 761 #endif
 762
 763                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 764                         goto rtattr_failure;
 765
 766 #ifdef CONFIG_NET_CLS_IND
 767                 if(strlen(n->indev))
 768                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 769 #endif
 770 #ifdef CONFIG_CLS_U32_PERF
 771                 RTA_PUT(skb, TCA_U32_PCNT,
 772                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 773                         n->pf);
 774 #endif
 775         }
 776
 777         rta->rta_len = skb->tail - b;
 778         if (TC_U32_KEY(n->handle))
 779                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 780                         goto rtattr_failure;
 781         return skb->len;
 782
 783 rtattr_failure:
 784         skb_trim(skb, b - skb->data);
 785         return -1;
 786 }
 787
 788 static struct tcf_proto_ops cls_u32_ops = {
 789         .next           =       NULL,
 790         .kind           =       "u32",
 791         .classify       =       u32_classify,
 792         .init           =       u32_init,
 793         .destroy        =       u32_destroy,
 794         .get            =       u32_get,
 795         .put            =       u32_put,
 796         .change         =       u32_change,
 797         .delete         =       u32_delete,
 798         .walk           =       u32_walk,
 799         .dump           =       u32_dump,
 800         .owner          =       THIS_MODULE,
 801 };
 802
 803 static int __init init_u32(void)
 804 {
 805         printk("u32 classifier\n");
 806 #ifdef CONFIG_CLS_U32_PERF
 807         printk("    Perfomance counters on\n");
 808 #endif
 809 #ifdef CONFIG_NET_CLS_POLICE
 810         printk("    OLD policer on \n");
 811 #endif
 812 #ifdef CONFIG_NET_CLS_IND
 813         printk("    input device check on \n");
 814 #endif
 815 #ifdef CONFIG_NET_CLS_ACT
 816         printk("    Actions configured \n");
 817 #endif
 818         return register_tcf_proto_ops(&cls_u32_ops);
 819 }
 820
 821 static void __exit exit_u32(void)
 822 {
 823         unregister_tcf_proto_ops(&cls_u32_ops);
 824 }
 825
 826 module_init(init_u32)
 827 module_exit(exit_u32)
 828 MODULE_LICENSE("GPL");