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