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/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 const 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(__be32 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 ((*(__be32*)(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(*(__be32*)(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 & *(__be16*)(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                         ht->refcnt--;
 416                         u32_clear_hnode(tp, ht);
 417                 }
 418
 419                 while ((ht = tp_c->hlist) != NULL) {
 420                         tp_c->hlist = ht->next;
 421
 422                         BUG_TRAP(ht->refcnt == 0);
 423
 424                         kfree(ht);
 425                 }
 426
 427                 kfree(tp_c);
 428         }
 429
 430         tp->data = NULL;
 431 }
 432
 433 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 434 {
 435         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 436
 437         if (ht == NULL)
 438                 return 0;
 439
 440         if (TC_U32_KEY(ht->handle))
 441                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 442
 443         if (tp->root == ht)
 444                 return -EINVAL;
 445
 446         if (ht->refcnt == 1) {
 447                 ht->refcnt--;
 448                 u32_destroy_hnode(tp, ht);
 449         } else {
 450                 return -EBUSY;
 451         }
 452
 453         return 0;
 454 }
 455
 456 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 457 {
 458         struct tc_u_knode *n;
 459         unsigned i = 0x7FF;
 460
 461         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 462                 if (i < TC_U32_NODE(n->handle))
 463                         i = TC_U32_NODE(n->handle);
 464         i++;
 465
 466         return handle|(i>0xFFF ? 0xFFF : i);
 467 }
 468
 469 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 470         [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 471         [TCA_U32_HASH]          = { .type = NLA_U32 },
 472         [TCA_U32_LINK]          = { .type = NLA_U32 },
 473         [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 474         [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 475         [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 476         [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 477 };
 478
 479 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 480                          struct tc_u_hnode *ht,
 481                          struct tc_u_knode *n, struct nlattr **tb,
 482                          struct nlattr *est)
 483 {
 484         int err;
 485         struct tcf_exts e;
 486
 487         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 488         if (err < 0)
 489                 return err;
 490
 491         err = -EINVAL;
 492         if (tb[TCA_U32_LINK]) {
 493                 u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 494                 struct tc_u_hnode *ht_down = NULL;
 495
 496                 if (TC_U32_KEY(handle))
 497                         goto errout;
 498
 499                 if (handle) {
 500                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 501
 502                         if (ht_down == NULL)
 503                                 goto errout;
 504                         ht_down->refcnt++;
 505                 }
 506
 507                 tcf_tree_lock(tp);
 508                 ht_down = xchg(&n->ht_down, ht_down);
 509                 tcf_tree_unlock(tp);
 510
 511                 if (ht_down)
 512                         ht_down->refcnt--;
 513         }
 514         if (tb[TCA_U32_CLASSID]) {
 515                 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 516                 tcf_bind_filter(tp, &n->res, base);
 517         }
 518
 519 #ifdef CONFIG_NET_CLS_IND
 520         if (tb[TCA_U32_INDEV]) {
 521                 err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
 522                 if (err < 0)
 523                         goto errout;
 524         }
 525 #endif
 526         tcf_exts_change(tp, &n->exts, &e);
 527
 528         return 0;
 529 errout:
 530         tcf_exts_destroy(tp, &e);
 531         return err;
 532 }
 533
 534 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 535                       struct nlattr **tca,
 536                       unsigned long *arg)
 537 {
 538         struct tc_u_common *tp_c = tp->data;
 539         struct tc_u_hnode *ht;
 540         struct tc_u_knode *n;
 541         struct tc_u32_sel *s;
 542         struct nlattr *opt = tca[TCA_OPTIONS];
 543         struct nlattr *tb[TCA_U32_MAX + 1];
 544         u32 htid;
 545         int err;
 546
 547         if (opt == NULL)
 548                 return handle ? -EINVAL : 0;
 549
 550         err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 551         if (err < 0)
 552                 return err;
 553
 554         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 555                 if (TC_U32_KEY(n->handle) == 0)
 556                         return -EINVAL;
 557
 558                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
 559         }
 560
 561         if (tb[TCA_U32_DIVISOR]) {
 562                 unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 563
 564                 if (--divisor > 0x100)
 565                         return -EINVAL;
 566                 if (TC_U32_KEY(handle))
 567                         return -EINVAL;
 568                 if (handle == 0) {
 569                         handle = gen_new_htid(tp->data);
 570                         if (handle == 0)
 571                                 return -ENOMEM;
 572                 }
 573                 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 574                 if (ht == NULL)
 575                         return -ENOBUFS;
 576                 ht->tp_c = tp_c;
 577                 ht->refcnt = 1;
 578                 ht->divisor = divisor;
 579                 ht->handle = handle;
 580                 ht->prio = tp->prio;
 581                 ht->next = tp_c->hlist;
 582                 tp_c->hlist = ht;
 583                 *arg = (unsigned long)ht;
 584                 return 0;
 585         }
 586
 587         if (tb[TCA_U32_HASH]) {
 588                 htid = nla_get_u32(tb[TCA_U32_HASH]);
 589                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 590                         ht = tp->root;
 591                         htid = ht->handle;
 592                 } else {
 593                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 594                         if (ht == NULL)
 595                                 return -EINVAL;
 596                 }
 597         } else {
 598                 ht = tp->root;
 599                 htid = ht->handle;
 600         }
 601
 602         if (ht->divisor < TC_U32_HASH(htid))
 603                 return -EINVAL;
 604
 605         if (handle) {
 606                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 607                         return -EINVAL;
 608                 handle = htid | TC_U32_NODE(handle);
 609         } else
 610                 handle = gen_new_kid(ht, htid);
 611
 612         if (tb[TCA_U32_SEL] == NULL)
 613                 return -EINVAL;
 614
 615         s = nla_data(tb[TCA_U32_SEL]);
 616
 617         n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 618         if (n == NULL)
 619                 return -ENOBUFS;
 620
 621 #ifdef CONFIG_CLS_U32_PERF
 622         n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 623         if (n->pf == NULL) {
 624                 kfree(n);
 625                 return -ENOBUFS;
 626         }
 627 #endif
 628
 629         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 630         n->ht_up = ht;
 631         n->handle = handle;
 632         n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
 633
 634 #ifdef CONFIG_CLS_U32_MARK
 635         if (tb[TCA_U32_MARK]) {
 636                 struct tc_u32_mark *mark;
 637
 638                 mark = nla_data(tb[TCA_U32_MARK]);
 639                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 640                 n->mark.success = 0;
 641         }
 642 #endif
 643
 644         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
 645         if (err == 0) {
 646                 struct tc_u_knode **ins;
 647                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 648                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 649                                 break;
 650
 651                 n->next = *ins;
 652                 wmb();
 653                 *ins = n;
 654
 655                 *arg = (unsigned long)n;
 656                 return 0;
 657         }
 658 #ifdef CONFIG_CLS_U32_PERF
 659         kfree(n->pf);
 660 #endif
 661         kfree(n);
 662         return err;
 663 }
 664
 665 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 666 {
 667         struct tc_u_common *tp_c = tp->data;
 668         struct tc_u_hnode *ht;
 669         struct tc_u_knode *n;
 670         unsigned h;
 671
 672         if (arg->stop)
 673                 return;
 674
 675         for (ht = tp_c->hlist; ht; ht = ht->next) {
 676                 if (ht->prio != tp->prio)
 677                         continue;
 678                 if (arg->count >= arg->skip) {
 679                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 680                                 arg->stop = 1;
 681                                 return;
 682                         }
 683                 }
 684                 arg->count++;
 685                 for (h = 0; h <= ht->divisor; h++) {
 686                         for (n = ht->ht[h]; n; n = n->next) {
 687                                 if (arg->count < arg->skip) {
 688                                         arg->count++;
 689                                         continue;
 690                                 }
 691                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 692                                         arg->stop = 1;
 693                                         return;
 694                                 }
 695                                 arg->count++;
 696                         }
 697                 }
 698         }
 699 }
 700
 701 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 702                      struct sk_buff *skb, struct tcmsg *t)
 703 {
 704         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 705         struct nlattr *nest;
 706
 707         if (n == NULL)
 708                 return skb->len;
 709
 710         t->tcm_handle = n->handle;
 711
 712         nest = nla_nest_start(skb, TCA_OPTIONS);
 713         if (nest == NULL)
 714                 goto nla_put_failure;
 715
 716         if (TC_U32_KEY(n->handle) == 0) {
 717                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 718                 u32 divisor = ht->divisor+1;
 719                 NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
 720         } else {
 721                 NLA_PUT(skb, TCA_U32_SEL,
 722                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 723                         &n->sel);
 724                 if (n->ht_up) {
 725                         u32 htid = n->handle & 0xFFFFF000;
 726                         NLA_PUT_U32(skb, TCA_U32_HASH, htid);
 727                 }
 728                 if (n->res.classid)
 729                         NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
 730                 if (n->ht_down)
 731                         NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
 732
 733 #ifdef CONFIG_CLS_U32_MARK
 734                 if (n->mark.val || n->mark.mask)
 735                         NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 736 #endif
 737
 738                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 739                         goto nla_put_failure;
 740
 741 #ifdef CONFIG_NET_CLS_IND
 742                 if(strlen(n->indev))
 743                         NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
 744 #endif
 745 #ifdef CONFIG_CLS_U32_PERF
 746                 NLA_PUT(skb, TCA_U32_PCNT,
 747                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 748                         n->pf);
 749 #endif
 750         }
 751
 752         nla_nest_end(skb, nest);
 753
 754         if (TC_U32_KEY(n->handle))
 755                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 756                         goto nla_put_failure;
 757         return skb->len;
 758
 759 nla_put_failure:
 760         nla_nest_cancel(skb, nest);
 761         return -1;
 762 }
 763
 764 static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 765         .kind           =       "u32",
 766         .classify       =       u32_classify,
 767         .init           =       u32_init,
 768         .destroy        =       u32_destroy,
 769         .get            =       u32_get,
 770         .put            =       u32_put,
 771         .change         =       u32_change,
 772         .delete         =       u32_delete,
 773         .walk           =       u32_walk,
 774         .dump           =       u32_dump,
 775         .owner          =       THIS_MODULE,
 776 };
 777
 778 static int __init init_u32(void)
 779 {
 780         printk("u32 classifier\n");
 781 #ifdef CONFIG_CLS_U32_PERF
 782         printk("    Performance counters on\n");
 783 #endif
 784 #ifdef CONFIG_NET_CLS_IND
 785         printk("    input device check on \n");
 786 #endif
 787 #ifdef CONFIG_NET_CLS_ACT
 788         printk("    Actions configured \n");
 789 #endif
 790         return register_tcf_proto_ops(&cls_u32_ops);
 791 }
 792
 793 static void __exit exit_u32(void)
 794 {
 795         unregister_tcf_proto_ops(&cls_u32_ops);
 796 }
 797
 798 module_init(init_u32)
 799 module_exit(exit_u32)
 800 MODULE_LICENSE("GPL");