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         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         struct tc_u_hnode       *next;
  67         u32                     handle;
  68         u32                     prio;
  69         struct tc_u_common      *tp_c;
  70         int                     refcnt;
  71         unsigned int            divisor;
  72         struct tc_u_knode       *ht[1];
  73 };
  74
  75 struct tc_u_common {
  76         struct tc_u_hnode       *hlist;
  77         struct Qdisc            *q;
  78         int                     refcnt;
  79         u32                     hgenerator;
  80 };
  81
  82 static const struct tcf_ext_map u32_ext_map = {
  83         .action = TCA_U32_ACT,
  84         .police = TCA_U32_POLICE
  85 };
  86
  87 static inline unsigned int u32_hash_fold(__be32 key,
  88                                          const struct tc_u32_sel *sel,
  89                                          u8 fshift)
  90 {
  91         unsigned int h = ntohl(key & sel->hmask) >> fshift;
  92
  93         return h;
  94 }
  95
  96 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res)
  97 {
  98         struct {
  99                 struct tc_u_knode *knode;
 100                 unsigned int      off;
 101         } stack[TC_U32_MAXDEPTH];
 102
 103         struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root;
 104         unsigned int off = skb_network_offset(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                         int toff = off + key->off + (off2 & key->offmask);
 137                         __be32 *data, hdata;
 138
 139                         if (skb_headroom(skb) + toff > INT_MAX)
 140                                 goto out;
 141
 142                         data = skb_header_pointer(skb, toff, 4, &hdata);
 143                         if (!data)
 144                                 goto out;
 145                         if ((*data ^ key->val) & key->mask) {
 146                                 n = n->next;
 147                                 goto next_knode;
 148                         }
 149 #ifdef CONFIG_CLS_U32_PERF
 150                         n->pf->kcnts[j] += 1;
 151                         j++;
 152 #endif
 153                 }
 154                 if (n->ht_down == NULL) {
 155 check_terminal:
 156                         if (n->sel.flags & TC_U32_TERMINAL) {
 157
 158                                 *res = n->res;
 159 #ifdef CONFIG_NET_CLS_IND
 160                                 if (!tcf_match_indev(skb, n->indev)) {
 161                                         n = n->next;
 162                                         goto next_knode;
 163                                 }
 164 #endif
 165 #ifdef CONFIG_CLS_U32_PERF
 166                                 n->pf->rhit += 1;
 167 #endif
 168                                 r = tcf_exts_exec(skb, &n->exts, res);
 169                                 if (r < 0) {
 170                                         n = n->next;
 171                                         goto next_knode;
 172                                 }
 173
 174                                 return r;
 175                         }
 176                         n = n->next;
 177                         goto next_knode;
 178                 }
 179
 180                 /* PUSH */
 181                 if (sdepth >= TC_U32_MAXDEPTH)
 182                         goto deadloop;
 183                 stack[sdepth].knode = n;
 184                 stack[sdepth].off = off;
 185                 sdepth++;
 186
 187                 ht = n->ht_down;
 188                 sel = 0;
 189                 if (ht->divisor) {
 190                         __be32 *data, hdata;
 191
 192                         data = skb_header_pointer(skb, off + n->sel.hoff, 4,
 193                                                   &hdata);
 194                         if (!data)
 195                                 goto out;
 196                         sel = ht->divisor & u32_hash_fold(*data, &n->sel,
 197                                                           n->fshift);
 198                 }
 199                 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT)))
 200                         goto next_ht;
 201
 202                 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) {
 203                         off2 = n->sel.off + 3;
 204                         if (n->sel.flags & TC_U32_VAROFFSET) {
 205                                 __be16 *data, hdata;
 206
 207                                 data = skb_header_pointer(skb,
 208                                                           off + n->sel.offoff,
 209                                                           2, &hdata);
 210                                 if (!data)
 211                                         goto out;
 212                                 off2 += ntohs(n->sel.offmask & *data) >>
 213                                         n->sel.offshift;
 214                         }
 215                         off2 &= ~3;
 216                 }
 217                 if (n->sel.flags & TC_U32_EAT) {
 218                         off += off2;
 219                         off2 = 0;
 220                 }
 221
 222                 if (off < skb->len)
 223                         goto next_ht;
 224         }
 225
 226         /* POP */
 227         if (sdepth--) {
 228                 n = stack[sdepth].knode;
 229                 ht = n->ht_up;
 230                 off = stack[sdepth].off;
 231                 goto check_terminal;
 232         }
 233 out:
 234         return -1;
 235
 236 deadloop:
 237         if (net_ratelimit())
 238                 pr_warning("cls_u32: dead loop\n");
 239         return -1;
 240 }
 241
 242 static struct tc_u_hnode *
 243 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 244 {
 245         struct tc_u_hnode *ht;
 246
 247         for (ht = tp_c->hlist; ht; ht = ht->next)
 248                 if (ht->handle == handle)
 249                         break;
 250
 251         return ht;
 252 }
 253
 254 static struct tc_u_knode *
 255 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 256 {
 257         unsigned int sel;
 258         struct tc_u_knode *n = NULL;
 259
 260         sel = TC_U32_HASH(handle);
 261         if (sel > ht->divisor)
 262                 goto out;
 263
 264         for (n = ht->ht[sel]; n; n = n->next)
 265                 if (n->handle == handle)
 266                         break;
 267 out:
 268         return n;
 269 }
 270
 271
 272 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 273 {
 274         struct tc_u_hnode *ht;
 275         struct tc_u_common *tp_c = tp->data;
 276
 277         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 278                 ht = tp->root;
 279         else
 280                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 281
 282         if (!ht)
 283                 return 0;
 284
 285         if (TC_U32_KEY(handle) == 0)
 286                 return (unsigned long)ht;
 287
 288         return (unsigned long)u32_lookup_key(ht, handle);
 289 }
 290
 291 static void u32_put(struct tcf_proto *tp, unsigned long f)
 292 {
 293 }
 294
 295 static u32 gen_new_htid(struct tc_u_common *tp_c)
 296 {
 297         int i = 0x800;
 298
 299         do {
 300                 if (++tp_c->hgenerator == 0x7FF)
 301                         tp_c->hgenerator = 1;
 302         } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 303
 304         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 305 }
 306
 307 static int u32_init(struct tcf_proto *tp)
 308 {
 309         struct tc_u_hnode *root_ht;
 310         struct tc_u_common *tp_c;
 311
 312         tp_c = tp->q->u32_node;
 313
 314         root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 315         if (root_ht == NULL)
 316                 return -ENOBUFS;
 317
 318         root_ht->divisor = 0;
 319         root_ht->refcnt++;
 320         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 321         root_ht->prio = tp->prio;
 322
 323         if (tp_c == NULL) {
 324                 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 325                 if (tp_c == NULL) {
 326                         kfree(root_ht);
 327                         return -ENOBUFS;
 328                 }
 329                 tp_c->q = tp->q;
 330                 tp->q->u32_node = 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         kfree(n->pf);
 351 #endif
 352         kfree(n);
 353         return 0;
 354 }
 355
 356 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 357 {
 358         struct tc_u_knode **kp;
 359         struct tc_u_hnode *ht = key->ht_up;
 360
 361         if (ht) {
 362                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 363                         if (*kp == key) {
 364                                 tcf_tree_lock(tp);
 365                                 *kp = key->next;
 366                                 tcf_tree_unlock(tp);
 367
 368                                 u32_destroy_key(tp, key);
 369                                 return 0;
 370                         }
 371                 }
 372         }
 373         WARN_ON(1);
 374         return 0;
 375 }
 376
 377 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 378 {
 379         struct tc_u_knode *n;
 380         unsigned int h;
 381
 382         for (h = 0; h <= ht->divisor; h++) {
 383                 while ((n = ht->ht[h]) != NULL) {
 384                         ht->ht[h] = n->next;
 385
 386                         u32_destroy_key(tp, n);
 387                 }
 388         }
 389 }
 390
 391 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 392 {
 393         struct tc_u_common *tp_c = tp->data;
 394         struct tc_u_hnode **hn;
 395
 396         WARN_ON(ht->refcnt);
 397
 398         u32_clear_hnode(tp, ht);
 399
 400         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 401                 if (*hn == ht) {
 402                         *hn = ht->next;
 403                         kfree(ht);
 404                         return 0;
 405                 }
 406         }
 407
 408         WARN_ON(1);
 409         return -ENOENT;
 410 }
 411
 412 static void u32_destroy(struct tcf_proto *tp)
 413 {
 414         struct tc_u_common *tp_c = tp->data;
 415         struct tc_u_hnode *root_ht = tp->root;
 416
 417         WARN_ON(root_ht == NULL);
 418
 419         if (root_ht && --root_ht->refcnt == 0)
 420                 u32_destroy_hnode(tp, root_ht);
 421
 422         if (--tp_c->refcnt == 0) {
 423                 struct tc_u_hnode *ht;
 424
 425                 tp->q->u32_node = NULL;
 426
 427                 for (ht = tp_c->hlist; ht; ht = ht->next) {
 428                         ht->refcnt--;
 429                         u32_clear_hnode(tp, ht);
 430                 }
 431
 432                 while ((ht = tp_c->hlist) != NULL) {
 433                         tp_c->hlist = ht->next;
 434
 435                         WARN_ON(ht->refcnt != 0);
 436
 437                         kfree(ht);
 438                 }
 439
 440                 kfree(tp_c);
 441         }
 442
 443         tp->data = NULL;
 444 }
 445
 446 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 447 {
 448         struct tc_u_hnode *ht = (struct tc_u_hnode *)arg;
 449
 450         if (ht == NULL)
 451                 return 0;
 452
 453         if (TC_U32_KEY(ht->handle))
 454                 return u32_delete_key(tp, (struct tc_u_knode *)ht);
 455
 456         if (tp->root == ht)
 457                 return -EINVAL;
 458
 459         if (ht->refcnt == 1) {
 460                 ht->refcnt--;
 461                 u32_destroy_hnode(tp, ht);
 462         } else {
 463                 return -EBUSY;
 464         }
 465
 466         return 0;
 467 }
 468
 469 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 470 {
 471         struct tc_u_knode *n;
 472         unsigned int i = 0x7FF;
 473
 474         for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 475                 if (i < TC_U32_NODE(n->handle))
 476                         i = TC_U32_NODE(n->handle);
 477         i++;
 478
 479         return handle | (i > 0xFFF ? 0xFFF : i);
 480 }
 481
 482 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 483         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 484         [TCA_U32_HASH]          = { .type = NLA_U32 },
 485         [TCA_U32_LINK]          = { .type = NLA_U32 },
 486         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 487         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 488         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 489         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 490 };
 491
 492 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 493                          struct tc_u_hnode *ht,
 494                          struct tc_u_knode *n, struct nlattr **tb,
 495                          struct nlattr *est)
 496 {
 497         int err;
 498         struct tcf_exts e;
 499
 500         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 501         if (err < 0)
 502                 return err;
 503
 504         err = -EINVAL;
 505         if (tb[TCA_U32_LINK]) {
 506                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 507                 struct tc_u_hnode *ht_down = NULL, *ht_old;
 508
 509                 if (TC_U32_KEY(handle))
 510                         goto errout;
 511
 512                 if (handle) {
 513                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 514
 515                         if (ht_down == NULL)
 516                                 goto errout;
 517                         ht_down->refcnt++;
 518                 }
 519
 520                 tcf_tree_lock(tp);
 521                 ht_old = n->ht_down;
 522                 n->ht_down = ht_down;
 523                 tcf_tree_unlock(tp);
 524
 525                 if (ht_old)
 526                         ht_old->refcnt--;
 527         }
 528         if (tb[TCA_U32_CLASSID]) {
 529                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 530                 tcf_bind_filter(tp, &n->res, base);
 531         }
 532
 533 #ifdef CONFIG_NET_CLS_IND
 534         if (tb[TCA_U32_INDEV]) {
 535                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
 536                 if (err < 0)
 537                         goto errout;
 538         }
 539 #endif
 540         tcf_exts_change(tp, &n->exts, &e);
 541
 542         return 0;
 543 errout:
 544         tcf_exts_destroy(tp, &e);
 545         return err;
 546 }
 547
 548 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 549                       struct nlattr **tca,
 550                       unsigned long *arg)
 551 {
 552         struct tc_u_common *tp_c = tp->data;
 553         struct tc_u_hnode *ht;
 554         struct tc_u_knode *n;
 555         struct tc_u32_sel *s;
 556         struct nlattr *opt = tca[TCA_OPTIONS];
 557         struct nlattr *tb[TCA_U32_MAX + 1];
 558         u32 htid;
 559         int err;
 560
 561         if (opt == NULL)
 562                 return handle ? -EINVAL : 0;
 563
 564         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 565         if (err < 0)
 566                 return err;
 567
 568         n = (struct tc_u_knode *)*arg;
 569         if (n) {
 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 int 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 int 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
 736                 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
 737         } else {
 738                 NLA_PUT(skb, TCA_U32_SEL,
 739                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 740                         &n->sel);
 741                 if (n->ht_up) {
 742                         u32 htid = n->handle & 0xFFFFF000;
 743                         NLA_PUT_U32(skb, TCA_U32_HASH, htid);
 744                 }
 745                 if (n->res.classid)
 746                         NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
 747                 if (n->ht_down)
 748                         NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
 749
 750 #ifdef CONFIG_CLS_U32_MARK
 751                 if (n->mark.val || n->mark.mask)
 752                         NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 753 #endif
 754
 755                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 756                         goto nla_put_failure;
 757
 758 #ifdef CONFIG_NET_CLS_IND
 759                 if (strlen(n->indev))
 760                         NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
 761 #endif
 762 #ifdef CONFIG_CLS_U32_PERF
 763                 NLA_PUT(skb, TCA_U32_PCNT,
 764                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 765                         n->pf);
 766 #endif
 767         }
 768
 769         nla_nest_end(skb, nest);
 770
 771         if (TC_U32_KEY(n->handle))
 772                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 773                         goto nla_put_failure;
 774         return skb->len;
 775
 776 nla_put_failure:
 777         nla_nest_cancel(skb, nest);
 778         return -1;
 779 }
 780
 781 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 782         .kind           =       "u32",
 783         .classify       =       u32_classify,
 784         .init           =       u32_init,
 785         .destroy        =       u32_destroy,
 786         .get            =       u32_get,
 787         .put            =       u32_put,
 788         .change         =       u32_change,
 789         .delete         =       u32_delete,
 790         .walk           =       u32_walk,
 791         .dump           =       u32_dump,
 792         .owner          =       THIS_MODULE,
 793 };
 794
 795 static int __init init_u32(void)
 796 {
 797         pr_info("u32 classifier\n");
 798 #ifdef CONFIG_CLS_U32_PERF
 799         pr_info("    Performance counters on\n");
 800 #endif
 801 #ifdef CONFIG_NET_CLS_IND
 802         pr_info("    input device check on\n");
 803 #endif
 804 #ifdef CONFIG_NET_CLS_ACT
 805         pr_info("    Actions configured\n");
 806 #endif
 807         return register_tcf_proto_ops(&cls_u32_ops);
 808 }
 809
 810 static void __exit exit_u32(void)
 811 {
 812         unregister_tcf_proto_ops(&cls_u32_ops);
 813 }
 814
 815 module_init(init_u32)
 816 module_exit(exit_u32)
 817 MODULE_LICENSE("GPL");