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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_hnode       *hlist;
  79         struct Qdisc            *q;
  80         int                     refcnt;
  81         u32                     hgenerator;
  82 };
  83
  84 static const struct tcf_ext_map u32_ext_map = {
  85         .action = TCA_U32_ACT,
  86         .police = TCA_U32_POLICE
  87 };
  88
  89 static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
  90 {
  91         unsigned h = ntohl(key & sel->hmask)>>fshift;
  92
  93         return h;
  94 }
  95
  96 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
  97 {
  98         struct {
  99                 struct tc_u_knode *knode;
 100                 u8                *ptr;
 101         } stack[TC_U32_MAXDEPTH];
 102
 103         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 104         u8 *ptr = skb_network_header(skb);
 105         struct tc_u_knode *n;
 106         int sdepth = 0;
 107         int off2 = 0;
 108         int sel = 0;
 109 #ifdef CONFIG_CLS_U32_PERF
 110         int j;
 111 #endif
 112         int i, r;
 113
 114 next_ht:
 115         n = ht->ht[sel];
 116
 117 next_knode:
 118         if (n) {
 119                 struct tc_u32_key *key = n->sel.keys;
 120
 121 #ifdef CONFIG_CLS_U32_PERF
 122                 n->pf->rcnt +=1;
 123                 j = 0;
 124 #endif
 125
 126 #ifdef CONFIG_CLS_U32_MARK
 127                 if ((skb->mark & n->mark.mask) != n->mark.val) {
 128                         n = n->next;
 129                         goto next_knode;
 130                 } else {
 131                         n->mark.success++;
 132                 }
 133 #endif
 134
 135                 for (i = n->sel.nkeys; i>0; i--, key++) {
 136
 137                         if ((*(__be32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 138                                 n = n->next;
 139                                 goto next_knode;
 140                         }
 141 #ifdef CONFIG_CLS_U32_PERF
 142                         n->pf->kcnts[j] +=1;
 143                         j++;
 144 #endif
 145                 }
 146                 if (n->ht_down == NULL) {
 147 check_terminal:
 148                         if (n->sel.flags&TC_U32_TERMINAL) {
 149
 150                                 *res = n->res;
 151 #ifdef CONFIG_NET_CLS_IND
 152                                 if (!tcf_match_indev(skb, n->indev)) {
 153                                         n = n->next;
 154                                         goto next_knode;
 155                                 }
 156 #endif
 157 #ifdef CONFIG_CLS_U32_PERF
 158                                 n->pf->rhit +=1;
 159 #endif
 160                                 r = tcf_exts_exec(skb, &n->exts, res);
 161                                 if (r < 0) {
 162                                         n = n->next;
 163                                         goto next_knode;
 164                                 }
 165
 166                                 return r;
 167                         }
 168                         n = n->next;
 169                         goto next_knode;
 170                 }
 171
 172                 /* PUSH */
 173                 if (sdepth >= TC_U32_MAXDEPTH)
 174                         goto deadloop;
 175                 stack[sdepth].knode = n;
 176                 stack[sdepth].ptr = ptr;
 177                 sdepth++;
 178
 179                 ht = n->ht_down;
 180                 sel = 0;
 181                 if (ht->divisor)
 182                         sel = ht->divisor&u32_hash_fold(*(__be32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 183
 184                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 185                         goto next_ht;
 186
 187                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 188                         off2 = n->sel.off + 3;
 189                         if (n->sel.flags&TC_U32_VAROFFSET)
 190                                 off2 += ntohs(n->sel.offmask & *(__be16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 191                         off2 &= ~3;
 192                 }
 193                 if (n->sel.flags&TC_U32_EAT) {
 194                         ptr += off2;
 195                         off2 = 0;
 196                 }
 197
 198                 if (ptr < skb_tail_pointer(skb))
 199                         goto next_ht;
 200         }
 201
 202         /* POP */
 203         if (sdepth--) {
 204                 n = stack[sdepth].knode;
 205                 ht = n->ht_up;
 206                 ptr = stack[sdepth].ptr;
 207                 goto check_terminal;
 208         }
 209         return -1;
 210
 211 deadloop:
 212         if (net_ratelimit())
 213                 printk("cls_u32: dead loop\n");
 214         return -1;
 215 }
 216
 217 static __inline__ struct tc_u_hnode *
 218 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 219 {
 220         struct tc_u_hnode *ht;
 221
 222         for (ht = tp_c->hlist; ht; ht = ht->next)
 223                 if (ht->handle == handle)
 224                         break;
 225
 226         return ht;
 227 }
 228
 229 static __inline__ struct tc_u_knode *
 230 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 231 {
 232         unsigned sel;
 233         struct tc_u_knode *n = NULL;
 234
 235         sel = TC_U32_HASH(handle);
 236         if (sel > ht->divisor)
 237                 goto out;
 238
 239         for (n = ht->ht[sel]; n; n = n->next)
 240                 if (n->handle == handle)
 241                         break;
 242 out:
 243         return n;
 244 }
 245
 246
 247 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 248 {
 249         struct tc_u_hnode *ht;
 250         struct tc_u_common *tp_c = tp->data;
 251
 252         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 253                 ht = tp->root;
 254         else
 255                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 256
 257         if (!ht)
 258                 return 0;
 259
 260         if (TC_U32_KEY(handle) == 0)
 261                 return (unsigned long)ht;
 262
 263         return (unsigned long)u32_lookup_key(ht, handle);
 264 }
 265
 266 static void u32_put(struct tcf_proto *tp, unsigned long f)
 267 {
 268 }
 269
 270 static u32 gen_new_htid(struct tc_u_common *tp_c)
 271 {
 272         int i = 0x800;
 273
 274         do {
 275                 if (++tp_c->hgenerator == 0x7FF)
 276                         tp_c->hgenerator = 1;
 277         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 278
 279         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 280 }
 281
 282 static int u32_init(struct tcf_proto *tp)
 283 {
 284         struct tc_u_hnode *root_ht;
 285         struct tc_u_common *tp_c;
 286
 287         tp_c = tp->q->u32_node;
 288
 289         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 290         if (root_ht == NULL)
 291                 return -ENOBUFS;
 292
 293         root_ht->divisor = 0;
 294         root_ht->refcnt++;
 295         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 296         root_ht->prio = tp->prio;
 297
 298         if (tp_c == NULL) {
 299                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 300                 if (tp_c == NULL) {
 301                         kfree(root_ht);
 302                         return -ENOBUFS;
 303                 }
 304                 tp_c->q = tp->q;
 305                 tp->q->u32_node = tp_c;
 306         }
 307
 308         tp_c->refcnt++;
 309         root_ht->next = tp_c->hlist;
 310         tp_c->hlist = root_ht;
 311         root_ht->tp_c = tp_c;
 312
 313         tp->root = root_ht;
 314         tp->data = tp_c;
 315         return 0;
 316 }
 317
 318 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 319 {
 320         tcf_unbind_filter(tp, &n->res);
 321         tcf_exts_destroy(tp, &n->exts);
 322         if (n->ht_down)
 323                 n->ht_down->refcnt--;
 324 #ifdef CONFIG_CLS_U32_PERF
 325         kfree(n->pf);
 326 #endif
 327         kfree(n);
 328         return 0;
 329 }
 330
 331 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 332 {
 333         struct tc_u_knode **kp;
 334         struct tc_u_hnode *ht = key->ht_up;
 335
 336         if (ht) {
 337                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 338                         if (*kp == key) {
 339                                 tcf_tree_lock(tp);
 340                                 *kp = key->next;
 341                                 tcf_tree_unlock(tp);
 342
 343                                 u32_destroy_key(tp, key);
 344                                 return 0;
 345                         }
 346                 }
 347         }
 348         WARN_ON(1);
 349         return 0;
 350 }
 351
 352 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 353 {
 354         struct tc_u_knode *n;
 355         unsigned h;
 356
 357         for (h=0; h<=ht->divisor; h++) {
 358                 while ((n = ht->ht[h]) != NULL) {
 359                         ht->ht[h] = n->next;
 360
 361                         u32_destroy_key(tp, n);
 362                 }
 363         }
 364 }
 365
 366 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 367 {
 368         struct tc_u_common *tp_c = tp->data;
 369         struct tc_u_hnode **hn;
 370
 371         WARN_ON(ht->refcnt);
 372
 373         u32_clear_hnode(tp, ht);
 374
 375         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 376                 if (*hn == ht) {
 377                         *hn = ht->next;
 378                         kfree(ht);
 379                         return 0;
 380                 }
 381         }
 382
 383         WARN_ON(1);
 384         return -ENOENT;
 385 }
 386
 387 static void u32_destroy(struct tcf_proto *tp)
 388 {
 389         struct tc_u_common *tp_c = tp->data;
 390         struct tc_u_hnode *root_ht = tp->root;
 391
 392         WARN_ON(root_ht == NULL);
 393
 394         if (root_ht && --root_ht->refcnt == 0)
 395                 u32_destroy_hnode(tp, root_ht);
 396
 397         if (--tp_c->refcnt == 0) {
 398                 struct tc_u_hnode *ht;
 399
 400                 tp->q->u32_node = NULL;
 401
 402                 for (ht = tp_c->hlist; ht; ht = ht->next) {
 403                         ht->refcnt--;
 404                         u32_clear_hnode(tp, ht);
 405                 }
 406
 407                 while ((ht = tp_c->hlist) != NULL) {
 408                         tp_c->hlist = ht->next;
 409
 410                         WARN_ON(ht->refcnt != 0);
 411
 412                         kfree(ht);
 413                 }
 414
 415                 kfree(tp_c);
 416         }
 417
 418         tp->data = NULL;
 419 }
 420
 421 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 422 {
 423         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 424
 425         if (ht == NULL)
 426                 return 0;
 427
 428         if (TC_U32_KEY(ht->handle))
 429                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 430
 431         if (tp->root == ht)
 432                 return -EINVAL;
 433
 434         if (ht->refcnt == 1) {
 435                 ht->refcnt--;
 436                 u32_destroy_hnode(tp, ht);
 437         } else {
 438                 return -EBUSY;
 439         }
 440
 441         return 0;
 442 }
 443
 444 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 445 {
 446         struct tc_u_knode *n;
 447         unsigned i = 0x7FF;
 448
 449         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 450                 if (i < TC_U32_NODE(n->handle))
 451                         i = TC_U32_NODE(n->handle);
 452         i++;
 453
 454         return handle|(i>0xFFF ? 0xFFF : i);
 455 }
 456
 457 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 458         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 459         [TCA_U32_HASH]          = { .type = NLA_U32 },
 460         [TCA_U32_LINK]          = { .type = NLA_U32 },
 461         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 462         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 463         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 464         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 465 };
 466
 467 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 468                          struct tc_u_hnode *ht,
 469                          struct tc_u_knode *n, struct nlattr **tb,
 470                          struct nlattr *est)
 471 {
 472         int err;
 473         struct tcf_exts e;
 474
 475         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 476         if (err < 0)
 477                 return err;
 478
 479         err = -EINVAL;
 480         if (tb[TCA_U32_LINK]) {
 481                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 482                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 483
 484                 if (TC_U32_KEY(handle))
 485                         goto errout;
 486
 487                 if (handle) {
 488                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 489
 490                         if (ht_down == NULL)
 491                                 goto errout;
 492                         ht_down->refcnt++;
 493                 }
 494
 495                 tcf_tree_lock(tp);
 496                 ht_old = n->ht_down;
 497                 n->ht_down = ht_down;
 498                 tcf_tree_unlock(tp);
 499
 500                 if (ht_old)
 501                         ht_old->refcnt--;
 502         }
 503         if (tb[TCA_U32_CLASSID]) {
 504                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 505                 tcf_bind_filter(tp, &n->res, base);
 506         }
 507
 508 #ifdef CONFIG_NET_CLS_IND
 509         if (tb[TCA_U32_INDEV]) {
 510                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
 511                 if (err < 0)
 512                         goto errout;
 513         }
 514 #endif
 515         tcf_exts_change(tp, &n->exts, &e);
 516
 517         return 0;
 518 errout:
 519         tcf_exts_destroy(tp, &e);
 520         return err;
 521 }
 522
 523 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 524                       struct nlattr **tca,
 525                       unsigned long *arg)
 526 {
 527         struct tc_u_common *tp_c = tp->data;
 528         struct tc_u_hnode *ht;
 529         struct tc_u_knode *n;
 530         struct tc_u32_sel *s;
 531         struct nlattr *opt = tca[TCA_OPTIONS];
 532         struct nlattr *tb[TCA_U32_MAX + 1];
 533         u32 htid;
 534         int err;
 535
 536         if (opt == NULL)
 537                 return handle ? -EINVAL : 0;
 538
 539         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 540         if (err < 0)
 541                 return err;
 542
 543         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 544                 if (TC_U32_KEY(n->handle) == 0)
 545                         return -EINVAL;
 546
 547                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
 548         }
 549
 550         if (tb[TCA_U32_DIVISOR]) {
 551                 unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 552
 553                 if (--divisor > 0x100)
 554                         return -EINVAL;
 555                 if (TC_U32_KEY(handle))
 556                         return -EINVAL;
 557                 if (handle == 0) {
 558                         handle = gen_new_htid(tp->data);
 559                         if (handle == 0)
 560                                 return -ENOMEM;
 561                 }
 562                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 563                 if (ht == NULL)
 564                         return -ENOBUFS;
 565                 ht->tp_c = tp_c;
 566                 ht->refcnt = 1;
 567                 ht->divisor = divisor;
 568                 ht->handle = handle;
 569                 ht->prio = tp->prio;
 570                 ht->next = tp_c->hlist;
 571                 tp_c->hlist = ht;
 572                 *arg = (unsigned long)ht;
 573                 return 0;
 574         }
 575
 576         if (tb[TCA_U32_HASH]) {
 577                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 578                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 579                         ht = tp->root;
 580                         htid = ht->handle;
 581                 } else {
 582                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 583                         if (ht == NULL)
 584                                 return -EINVAL;
 585                 }
 586         } else {
 587                 ht = tp->root;
 588                 htid = ht->handle;
 589         }
 590
 591         if (ht->divisor < TC_U32_HASH(htid))
 592                 return -EINVAL;
 593
 594         if (handle) {
 595                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 596                         return -EINVAL;
 597                 handle = htid | TC_U32_NODE(handle);
 598         } else
 599                 handle = gen_new_kid(ht, htid);
 600
 601         if (tb[TCA_U32_SEL] == NULL)
 602                 return -EINVAL;
 603
 604         s = nla_data(tb[TCA_U32_SEL]);
 605
 606         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 607         if (n == NULL)
 608                 return -ENOBUFS;
 609
 610 #ifdef CONFIG_CLS_U32_PERF
 611         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 612         if (n->pf == NULL) {
 613                 kfree(n);
 614                 return -ENOBUFS;
 615         }
 616 #endif
 617
 618         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 619         n->ht_up = ht;
 620         n->handle = handle;
 621         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
 622
 623 #ifdef CONFIG_CLS_U32_MARK
 624         if (tb[TCA_U32_MARK]) {
 625                 struct tc_u32_mark *mark;
 626
 627                 mark = nla_data(tb[TCA_U32_MARK]);
 628                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 629                 n->mark.success = 0;
 630         }
 631 #endif
 632
 633         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
 634         if (err == 0) {
 635                 struct tc_u_knode **ins;
 636                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 637                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 638                                 break;
 639
 640                 n->next = *ins;
 641                 tcf_tree_lock(tp);
 642                 *ins = n;
 643                 tcf_tree_unlock(tp);
 644
 645                 *arg = (unsigned long)n;
 646                 return 0;
 647         }
 648 #ifdef CONFIG_CLS_U32_PERF
 649         kfree(n->pf);
 650 #endif
 651         kfree(n);
 652         return err;
 653 }
 654
 655 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 656 {
 657         struct tc_u_common *tp_c = tp->data;
 658         struct tc_u_hnode *ht;
 659         struct tc_u_knode *n;
 660         unsigned h;
 661
 662         if (arg->stop)
 663                 return;
 664
 665         for (ht = tp_c->hlist; ht; ht = ht->next) {
 666                 if (ht->prio != tp->prio)
 667                         continue;
 668                 if (arg->count >= arg->skip) {
 669                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 670                                 arg->stop = 1;
 671                                 return;
 672                         }
 673                 }
 674                 arg->count++;
 675                 for (h = 0; h <= ht->divisor; h++) {
 676                         for (n = ht->ht[h]; n; n = n->next) {
 677                                 if (arg->count < arg->skip) {
 678                                         arg->count++;
 679                                         continue;
 680                                 }
 681                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 682                                         arg->stop = 1;
 683                                         return;
 684                                 }
 685                                 arg->count++;
 686                         }
 687                 }
 688         }
 689 }
 690
 691 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 692                      struct sk_buff *skb, struct tcmsg *t)
 693 {
 694         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 695         struct nlattr *nest;
 696
 697         if (n == NULL)
 698                 return skb->len;
 699
 700         t->tcm_handle = n->handle;
 701
 702         nest = nla_nest_start(skb, TCA_OPTIONS);
 703         if (nest == NULL)
 704                 goto nla_put_failure;
 705
 706         if (TC_U32_KEY(n->handle) == 0) {
 707                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 708                 u32 divisor = ht->divisor+1;
 709                 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
 710         } else {
 711                 NLA_PUT(skb, TCA_U32_SEL,
 712                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 713                         &n->sel);
 714                 if (n->ht_up) {
 715                         u32 htid = n->handle & 0xFFFFF000;
 716                         NLA_PUT_U32(skb, TCA_U32_HASH, htid);
 717                 }
 718                 if (n->res.classid)
 719                         NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
 720                 if (n->ht_down)
 721                         NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
 722
 723 #ifdef CONFIG_CLS_U32_MARK
 724                 if (n->mark.val || n->mark.mask)
 725                         NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 726 #endif
 727
 728                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 729                         goto nla_put_failure;
 730
 731 #ifdef CONFIG_NET_CLS_IND
 732                 if(strlen(n->indev))
 733                         NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
 734 #endif
 735 #ifdef CONFIG_CLS_U32_PERF
 736                 NLA_PUT(skb, TCA_U32_PCNT,
 737                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 738                         n->pf);
 739 #endif
 740         }
 741
 742         nla_nest_end(skb, nest);
 743
 744         if (TC_U32_KEY(n->handle))
 745                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 746                         goto nla_put_failure;
 747         return skb->len;
 748
 749 nla_put_failure:
 750         nla_nest_cancel(skb, nest);
 751         return -1;
 752 }
 753
 754 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 755         .kind           =       "u32",
 756         .classify       =       u32_classify,
 757         .init           =       u32_init,
 758         .destroy        =       u32_destroy,
 759         .get            =       u32_get,
 760         .put            =       u32_put,
 761         .change         =       u32_change,
 762         .delete         =       u32_delete,
 763         .walk           =       u32_walk,
 764         .dump           =       u32_dump,
 765         .owner          =       THIS_MODULE,
 766 };
 767
 768 static int __init init_u32(void)
 769 {
 770         printk("u32 classifier\n");
 771 #ifdef CONFIG_CLS_U32_PERF
 772         printk("    Performance counters on\n");
 773 #endif
 774 #ifdef CONFIG_NET_CLS_IND
 775         printk("    input device check on \n");
 776 #endif
 777 #ifdef CONFIG_NET_CLS_ACT
 778         printk("    Actions configured \n");
 779 #endif
 780         return register_tcf_proto_ops(&cls_u32_ops);
 781 }
 782
 783 static void __exit exit_u32(void)
 784 {
 785         unregister_tcf_proto_ops(&cls_u32_ops);
 786 }
 787
 788 module_init(init_u32)
 789 module_exit(exit_u32)
 790 MODULE_LICENSE("GPL");