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 <linux/module.h>
  34 #include <linux/slab.h>
  35 #include <linux/types.h>
  36 #include <linux/kernel.h>
  37 #include <linux/string.h>
  38 #include <linux/errno.h>
  39 #include <linux/rtnetlink.h>
  40 #include <linux/skbuff.h>
  41 #include <net/netlink.h>
  42 #include <net/act_api.h>
  43 #include <net/pkt_cls.h>
  44
  45 struct tc_u_knode
  46 {
  47         struct tc_u_knode       *next;
  48         u32                     handle;
  49         struct tc_u_hnode       *ht_up;
  50         struct tcf_exts         exts;
  51 #ifdef CONFIG_NET_CLS_IND
  52         char                     indev[IFNAMSIZ];
  53 #endif
  54         u8                      fshift;
  55         struct tcf_result       res;
  56         struct tc_u_hnode       *ht_down;
  57 #ifdef CONFIG_CLS_U32_PERF
  58         struct tc_u32_pcnt      *pf;
  59 #endif
  60 #ifdef CONFIG_CLS_U32_MARK
  61         struct tc_u32_mark      mark;
  62 #endif
  63         struct tc_u32_sel       sel;
  64 };
  65
  66 struct tc_u_hnode
  67 {
  68         struct tc_u_hnode       *next;
  69         u32                     handle;
  70         u32                     prio;
  71         struct tc_u_common      *tp_c;
  72         int                     refcnt;
  73         unsigned                divisor;
  74         struct tc_u_knode       *ht[1];
  75 };
  76
  77 struct tc_u_common
  78 {
  79         struct tc_u_hnode       *hlist;
  80         struct Qdisc            *q;
  81         int                     refcnt;
  82         u32                     hgenerator;
  83 };
  84
  85 static const struct tcf_ext_map u32_ext_map = {
  86         .action = TCA_U32_ACT,
  87         .police = TCA_U32_POLICE
  88 };
  89
  90 static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
  91 {
  92         unsigned h = ntohl(key & sel->hmask)>>fshift;
  93
  94         return h;
  95 }
  96
  97 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
  98 {
  99         struct {
 100                 struct tc_u_knode *knode;
 101                 unsigned int      off;
 102         } stack[TC_U32_MAXDEPTH];
 103
 104         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 105         unsigned int off = skb_network_offset(skb);
 106         struct tc_u_knode *n;
 107         int sdepth = 0;
 108         int off2 = 0;
 109         int sel = 0;
 110 #ifdef CONFIG_CLS_U32_PERF
 111         int j;
 112 #endif
 113         int i, r;
 114
 115 next_ht:
 116         n = ht->ht[sel];
 117
 118 next_knode:
 119         if (n) {
 120                 struct tc_u32_key *key = n->sel.keys;
 121
 122 #ifdef CONFIG_CLS_U32_PERF
 123                 n->pf->rcnt +=1;
 124                 j = 0;
 125 #endif
 126
 127 #ifdef CONFIG_CLS_U32_MARK
 128                 if ((skb->mark & n->mark.mask) != n->mark.val) {
 129                         n = n->next;
 130                         goto next_knode;
 131                 } else {
 132                         n->mark.success++;
 133                 }
 134 #endif
 135
 136                 for (i = n->sel.nkeys; i>0; i--, key++) {
 137                         int toff = off + key->off + (off2 & key->offmask);
 138                         __be32 *data, _data;
 139
 140                         if (skb_headroom(skb) + toff > INT_MAX)
 141                                 goto out;
 142
 143                         data = skb_header_pointer(skb, toff, 4, &_data);
 144                         if (!data)
 145                                 goto out;
 146                         if ((*data ^ key->val) & key->mask) {
 147                                 n = n->next;
 148                                 goto next_knode;
 149                         }
 150 #ifdef CONFIG_CLS_U32_PERF
 151                         n->pf->kcnts[j] +=1;
 152                         j++;
 153 #endif
 154                 }
 155                 if (n->ht_down == NULL) {
 156 check_terminal:
 157                         if (n->sel.flags&TC_U32_TERMINAL) {
 158
 159                                 *res = n->res;
 160 #ifdef CONFIG_NET_CLS_IND
 161                                 if (!tcf_match_indev(skb, n->indev)) {
 162                                         n = n->next;
 163                                         goto next_knode;
 164                                 }
 165 #endif
 166 #ifdef CONFIG_CLS_U32_PERF
 167                                 n->pf->rhit +=1;
 168 #endif
 169                                 r = tcf_exts_exec(skb, &n->exts, res);
 170                                 if (r < 0) {
 171                                         n = n->next;
 172                                         goto next_knode;
 173                                 }
 174
 175                                 return r;
 176                         }
 177                         n = n->next;
 178                         goto next_knode;
 179                 }
 180
 181                 /* PUSH */
 182                 if (sdepth >= TC_U32_MAXDEPTH)
 183                         goto deadloop;
 184                 stack[sdepth].knode = n;
 185                 stack[sdepth].off = off;
 186                 sdepth++;
 187
 188                 ht = n->ht_down;
 189                 sel = 0;
 190                 if (ht->divisor) {
 191                         __be32 *data, _data;
 192
 193                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 194                                                   &_data);
 195                         if (!data)
 196                                 goto out;
 197                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 198                                                           n->fshift);
 199                 }
 200                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 201                         goto next_ht;
 202
 203                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 204                         off2 = n->sel.off + 3;
 205                         if (n->sel.flags & TC_U32_VAROFFSET) {
 206                                 __be16 *data, _data;
 207
 208                                 data = skb_header_pointer(skb,
 209                                                           off + n->sel.offoff,
 210                                                           2, &_data);
 211                                 if (!data)
 212                                         goto out;
 213                                 off2 += ntohs(n->sel.offmask & *data) >>
 214                                         n->sel.offshift;
 215                         }
 216                         off2 &= ~3;
 217                 }
 218                 if (n->sel.flags&TC_U32_EAT) {
 219                         off += off2;
 220                         off2 = 0;
 221                 }
 222
 223                 if (off < skb->len)
 224                         goto next_ht;
 225         }
 226
 227         /* POP */
 228         if (sdepth--) {
 229                 n = stack[sdepth].knode;
 230                 ht = n->ht_up;
 231                 off = stack[sdepth].off;
 232                 goto check_terminal;
 233         }
 234 out:
 235         return -1;
 236
 237 deadloop:
 238         if (net_ratelimit())
 239                 printk(KERN_WARNING "cls_u32: dead loop\n");
 240         return -1;
 241 }
 242
 243 static __inline__ struct tc_u_hnode *
 244 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 245 {
 246         struct tc_u_hnode *ht;
 247
 248         for (ht = tp_c->hlist; ht; ht = ht->next)
 249                 if (ht->handle == handle)
 250                         break;
 251
 252         return ht;
 253 }
 254
 255 static __inline__ struct tc_u_knode *
 256 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 257 {
 258         unsigned sel;
 259         struct tc_u_knode *n = NULL;
 260
 261         sel = TC_U32_HASH(handle);
 262         if (sel > ht->divisor)
 263                 goto out;
 264
 265         for (n = ht->ht[sel]; n; n = n->next)
 266                 if (n->handle == handle)
 267                         break;
 268 out:
 269         return n;
 270 }
 271
 272
 273 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 274 {
 275         struct tc_u_hnode *ht;
 276         struct tc_u_common *tp_c = tp->data;
 277
 278         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 279                 ht = tp->root;
 280         else
 281                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 282
 283         if (!ht)
 284                 return 0;
 285
 286         if (TC_U32_KEY(handle) == 0)
 287                 return (unsigned long)ht;
 288
 289         return (unsigned long)u32_lookup_key(ht, handle);
 290 }
 291
 292 static void u32_put(struct tcf_proto *tp, unsigned long f)
 293 {
 294 }
 295
 296 static u32 gen_new_htid(struct tc_u_common *tp_c)
 297 {
 298         int i = 0x800;
 299
 300         do {
 301                 if (++tp_c->hgenerator == 0x7FF)
 302                         tp_c->hgenerator = 1;
 303         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 304
 305         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 306 }
 307
 308 static int u32_init(struct tcf_proto *tp)
 309 {
 310         struct tc_u_hnode *root_ht;
 311         struct tc_u_common *tp_c;
 312
 313         tp_c = tp->q->u32_node;
 314
 315         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 316         if (root_ht == NULL)
 317                 return -ENOBUFS;
 318
 319         root_ht->divisor = 0;
 320         root_ht->refcnt++;
 321         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 322         root_ht->prio = tp->prio;
 323
 324         if (tp_c == NULL) {
 325                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 326                 if (tp_c == NULL) {
 327                         kfree(root_ht);
 328                         return -ENOBUFS;
 329                 }
 330                 tp_c->q = tp->q;
 331                 tp->q->u32_node = tp_c;
 332         }
 333
 334         tp_c->refcnt++;
 335         root_ht->next = tp_c->hlist;
 336         tp_c->hlist = root_ht;
 337         root_ht->tp_c = tp_c;
 338
 339         tp->root = root_ht;
 340         tp->data = tp_c;
 341         return 0;
 342 }
 343
 344 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 345 {
 346         tcf_unbind_filter(tp, &n->res);
 347         tcf_exts_destroy(tp, &n->exts);
 348         if (n->ht_down)
 349                 n->ht_down->refcnt--;
 350 #ifdef CONFIG_CLS_U32_PERF
 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         WARN_ON(1);
 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         WARN_ON(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         WARN_ON(1);
 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 = tp->root;
 417
 418         WARN_ON(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
 426                 tp->q->u32_node = NULL;
 427
 428                 for (ht = tp_c->hlist; ht; ht = ht->next) {
 429                         ht->refcnt--;
 430                         u32_clear_hnode(tp, ht);
 431                 }
 432
 433                 while ((ht = tp_c->hlist) != NULL) {
 434                         tp_c->hlist = ht->next;
 435
 436                         WARN_ON(ht->refcnt != 0);
 437
 438                         kfree(ht);
 439                 }
 440
 441                 kfree(tp_c);
 442         }
 443
 444         tp->data = NULL;
 445 }
 446
 447 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 448 {
 449         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 450
 451         if (ht == NULL)
 452                 return 0;
 453
 454         if (TC_U32_KEY(ht->handle))
 455                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 456
 457         if (tp->root == ht)
 458                 return -EINVAL;
 459
 460         if (ht->refcnt == 1) {
 461                 ht->refcnt--;
 462                 u32_destroy_hnode(tp, ht);
 463         } else {
 464                 return -EBUSY;
 465         }
 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 const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 484         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 485         [TCA_U32_HASH]          = { .type = NLA_U32 },
 486         [TCA_U32_LINK]          = { .type = NLA_U32 },
 487         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 488         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 489         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 490         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 491 };
 492
 493 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 494                          struct tc_u_hnode *ht,
 495                          struct tc_u_knode *n, struct nlattr **tb,
 496                          struct nlattr *est)
 497 {
 498         int err;
 499         struct tcf_exts e;
 500
 501         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 502         if (err < 0)
 503                 return err;
 504
 505         err = -EINVAL;
 506         if (tb[TCA_U32_LINK]) {
 507                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 508                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 509
 510                 if (TC_U32_KEY(handle))
 511                         goto errout;
 512
 513                 if (handle) {
 514                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 515
 516                         if (ht_down == NULL)
 517                                 goto errout;
 518                         ht_down->refcnt++;
 519                 }
 520
 521                 tcf_tree_lock(tp);
 522                 ht_old = n->ht_down;
 523                 n->ht_down = ht_down;
 524                 tcf_tree_unlock(tp);
 525
 526                 if (ht_old)
 527                         ht_old->refcnt--;
 528         }
 529         if (tb[TCA_U32_CLASSID]) {
 530                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 531                 tcf_bind_filter(tp, &n->res, base);
 532         }
 533
 534 #ifdef CONFIG_NET_CLS_IND
 535         if (tb[TCA_U32_INDEV]) {
 536                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
 537                 if (err < 0)
 538                         goto errout;
 539         }
 540 #endif
 541         tcf_exts_change(tp, &n->exts, &e);
 542
 543         return 0;
 544 errout:
 545         tcf_exts_destroy(tp, &e);
 546         return err;
 547 }
 548
 549 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 550                       struct nlattr **tca,
 551                       unsigned long *arg)
 552 {
 553         struct tc_u_common *tp_c = tp->data;
 554         struct tc_u_hnode *ht;
 555         struct tc_u_knode *n;
 556         struct tc_u32_sel *s;
 557         struct nlattr *opt = tca[TCA_OPTIONS];
 558         struct nlattr *tb[TCA_U32_MAX + 1];
 559         u32 htid;
 560         int err;
 561
 562         if (opt == NULL)
 563                 return handle ? -EINVAL : 0;
 564
 565         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 566         if (err < 0)
 567                 return err;
 568
 569         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 570                 if (TC_U32_KEY(n->handle) == 0)
 571                         return -EINVAL;
 572
 573                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
 574         }
 575
 576         if (tb[TCA_U32_DIVISOR]) {
 577                 unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 578
 579                 if (--divisor > 0x100)
 580                         return -EINVAL;
 581                 if (TC_U32_KEY(handle))
 582                         return -EINVAL;
 583                 if (handle == 0) {
 584                         handle = gen_new_htid(tp->data);
 585                         if (handle == 0)
 586                                 return -ENOMEM;
 587                 }
 588                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 589                 if (ht == NULL)
 590                         return -ENOBUFS;
 591                 ht->tp_c = tp_c;
 592                 ht->refcnt = 1;
 593                 ht->divisor = divisor;
 594                 ht->handle = handle;
 595                 ht->prio = tp->prio;
 596                 ht->next = tp_c->hlist;
 597                 tp_c->hlist = ht;
 598                 *arg = (unsigned long)ht;
 599                 return 0;
 600         }
 601
 602         if (tb[TCA_U32_HASH]) {
 603                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 604                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 605                         ht = tp->root;
 606                         htid = ht->handle;
 607                 } else {
 608                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 609                         if (ht == NULL)
 610                                 return -EINVAL;
 611                 }
 612         } else {
 613                 ht = tp->root;
 614                 htid = ht->handle;
 615         }
 616
 617         if (ht->divisor < TC_U32_HASH(htid))
 618                 return -EINVAL;
 619
 620         if (handle) {
 621                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 622                         return -EINVAL;
 623                 handle = htid | TC_U32_NODE(handle);
 624         } else
 625                 handle = gen_new_kid(ht, htid);
 626
 627         if (tb[TCA_U32_SEL] == NULL)
 628                 return -EINVAL;
 629
 630         s = nla_data(tb[TCA_U32_SEL]);
 631
 632         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 633         if (n == NULL)
 634                 return -ENOBUFS;
 635
 636 #ifdef CONFIG_CLS_U32_PERF
 637         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 638         if (n->pf == NULL) {
 639                 kfree(n);
 640                 return -ENOBUFS;
 641         }
 642 #endif
 643
 644         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 645         n->ht_up = ht;
 646         n->handle = handle;
 647         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
 648
 649 #ifdef CONFIG_CLS_U32_MARK
 650         if (tb[TCA_U32_MARK]) {
 651                 struct tc_u32_mark *mark;
 652
 653                 mark = nla_data(tb[TCA_U32_MARK]);
 654                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 655                 n->mark.success = 0;
 656         }
 657 #endif
 658
 659         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
 660         if (err == 0) {
 661                 struct tc_u_knode **ins;
 662                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 663                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 664                                 break;
 665
 666                 n->next = *ins;
 667                 tcf_tree_lock(tp);
 668                 *ins = n;
 669                 tcf_tree_unlock(tp);
 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         struct nlattr *nest;
 722
 723         if (n == NULL)
 724                 return skb->len;
 725
 726         t->tcm_handle = n->handle;
 727
 728         nest = nla_nest_start(skb, TCA_OPTIONS);
 729         if (nest == NULL)
 730                 goto nla_put_failure;
 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                 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
 736         } else {
 737                 NLA_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                         NLA_PUT_U32(skb, TCA_U32_HASH, htid);
 743                 }
 744                 if (n->res.classid)
 745                         NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
 746                 if (n->ht_down)
 747                         NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
 748
 749 #ifdef CONFIG_CLS_U32_MARK
 750                 if (n->mark.val || n->mark.mask)
 751                         NLA_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 nla_put_failure;
 756
 757 #ifdef CONFIG_NET_CLS_IND
 758                 if(strlen(n->indev))
 759                         NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
 760 #endif
 761 #ifdef CONFIG_CLS_U32_PERF
 762                 NLA_PUT(skb, TCA_U32_PCNT,
 763                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 764                         n->pf);
 765 #endif
 766         }
 767
 768         nla_nest_end(skb, nest);
 769
 770         if (TC_U32_KEY(n->handle))
 771                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 772                         goto nla_put_failure;
 773         return skb->len;
 774
 775 nla_put_failure:
 776         nla_nest_cancel(skb, nest);
 777         return -1;
 778 }
 779
 780 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 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         pr_info("u32 classifier\n");
 797 #ifdef CONFIG_CLS_U32_PERF
 798         pr_info("    Performance counters on\n");
 799 #endif
 800 #ifdef CONFIG_NET_CLS_IND
 801         pr_info("    input device check on\n");
 802 #endif
 803 #ifdef CONFIG_NET_CLS_ACT
 804         pr_info("    Actions configured\n");
 805 #endif
 806         return register_tcf_proto_ops(&cls_u32_ops);
 807 }
 808
 809 static void __exit exit_u32(void)
 810 {
 811         unregister_tcf_proto_ops(&cls_u32_ops);
 812 }
 813
 814 module_init(init_u32)
 815 module_exit(exit_u32)
 816 MODULE_LICENSE("GPL");