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 <asm/uaccess.h>
  34 #include <asm/system.h>
  35 #include <linux/bitops.h>
  36 #include <linux/config.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/kernel.h>
  40 #include <linux/sched.h>
  41 #include <linux/string.h>
  42 #include <linux/mm.h>
  43 #include <linux/socket.h>
  44 #include <linux/sockios.h>
  45 #include <linux/in.h>
  46 #include <linux/errno.h>
  47 #include <linux/interrupt.h>
  48 #include <linux/if_ether.h>
  49 #include <linux/inet.h>
  50 #include <linux/netdevice.h>
  51 #include <linux/etherdevice.h>
  52 #include <linux/notifier.h>
  53 #include <linux/rtnetlink.h>
  54 #include <net/ip.h>
  55 #include <net/route.h>
  56 #include <linux/skbuff.h>
  57 #include <net/sock.h>
  58 #include <net/act_api.h>
  59 #include <net/pkt_cls.h>
  60
  61 struct tc_u_knode
  62 {
  63         struct tc_u_knode       *next;
  64         u32                     handle;
  65         struct tc_u_hnode       *ht_up;
  66         struct tcf_exts         exts;
  67 #ifdef CONFIG_NET_CLS_IND
  68         char                     indev[IFNAMSIZ];
  69 #endif
  70         u8                      fshift;
  71         struct tcf_result       res;
  72         struct tc_u_hnode       *ht_down;
  73 #ifdef CONFIG_CLS_U32_PERF
  74         struct tc_u32_pcnt      *pf;
  75 #endif
  76 #ifdef CONFIG_CLS_U32_MARK
  77         struct tc_u32_mark      mark;
  78 #endif
  79         struct tc_u32_sel       sel;
  80 };
  81
  82 struct tc_u_hnode
  83 {
  84         struct tc_u_hnode       *next;
  85         u32                     handle;
  86         u32                     prio;
  87         struct tc_u_common      *tp_c;
  88         int                     refcnt;
  89         unsigned                divisor;
  90         struct tc_u_knode       *ht[1];
  91 };
  92
  93 struct tc_u_common
  94 {
  95         struct tc_u_common      *next;
  96         struct tc_u_hnode       *hlist;
  97         struct Qdisc            *q;
  98         int                     refcnt;
  99         u32                     hgenerator;
 100 };
 101
 102 static struct tcf_ext_map u32_ext_map = {
 103         .action = TCA_U32_ACT,
 104         .police = TCA_U32_POLICE
 105 };
 106
 107 static struct tc_u_common *u32_list;
 108
 109 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 110 {
 111         unsigned h = (key & sel->hmask)>>fshift;
 112
 113         return h;
 114 }
 115
 116 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 117 {
 118         struct {
 119                 struct tc_u_knode *knode;
 120                 u8                *ptr;
 121         } stack[TC_U32_MAXDEPTH];
 122
 123         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 124         u8 *ptr = skb->nh.raw;
 125         struct tc_u_knode *n;
 126         int sdepth = 0;
 127         int off2 = 0;
 128         int sel = 0;
 129 #ifdef CONFIG_CLS_U32_PERF
 130         int j;
 131 #endif
 132         int i, r;
 133
 134 next_ht:
 135         n = ht->ht[sel];
 136
 137 next_knode:
 138         if (n) {
 139                 struct tc_u32_key *key = n->sel.keys;
 140
 141 #ifdef CONFIG_CLS_U32_PERF
 142                 n->pf->rcnt +=1;
 143                 j = 0;
 144 #endif
 145
 146 #ifdef CONFIG_CLS_U32_MARK
 147                 if ((skb->nfmark & n->mark.mask) != n->mark.val) {
 148                         n = n->next;
 149                         goto next_knode;
 150                 } else {
 151                         n->mark.success++;
 152                 }
 153 #endif
 154
 155                 for (i = n->sel.nkeys; i>0; i--, key++) {
 156
 157                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 158                                 n = n->next;
 159                                 goto next_knode;
 160                         }
 161 #ifdef CONFIG_CLS_U32_PERF
 162                         n->pf->kcnts[j] +=1;
 163                         j++;
 164 #endif
 165                 }
 166                 if (n->ht_down == NULL) {
 167 check_terminal:
 168                         if (n->sel.flags&TC_U32_TERMINAL) {
 169
 170                                 *res = n->res;
 171 #ifdef CONFIG_NET_CLS_IND
 172                                 if (!tcf_match_indev(skb, n->indev)) {
 173                                         n = n->next;
 174                                         goto next_knode;
 175                                 }
 176 #endif
 177 #ifdef CONFIG_CLS_U32_PERF
 178                                 n->pf->rhit +=1;
 179 #endif
 180                                 r = tcf_exts_exec(skb, &n->exts, res);
 181                                 if (r < 0) {
 182                                         n = n->next;
 183                                         goto next_knode;
 184                                 }
 185
 186                                 return r;
 187                         }
 188                         n = n->next;
 189                         goto next_knode;
 190                 }
 191
 192                 /* PUSH */
 193                 if (sdepth >= TC_U32_MAXDEPTH)
 194                         goto deadloop;
 195                 stack[sdepth].knode = n;
 196                 stack[sdepth].ptr = ptr;
 197                 sdepth++;
 198
 199                 ht = n->ht_down;
 200                 sel = 0;
 201                 if (ht->divisor)
 202                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 203
 204                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 205                         goto next_ht;
 206
 207                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 208                         off2 = n->sel.off + 3;
 209                         if (n->sel.flags&TC_U32_VAROFFSET)
 210                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 211                         off2 &= ~3;
 212                 }
 213                 if (n->sel.flags&TC_U32_EAT) {
 214                         ptr += off2;
 215                         off2 = 0;
 216                 }
 217
 218                 if (ptr < skb->tail)
 219                         goto next_ht;
 220         }
 221
 222         /* POP */
 223         if (sdepth--) {
 224                 n = stack[sdepth].knode;
 225                 ht = n->ht_up;
 226                 ptr = stack[sdepth].ptr;
 227                 goto check_terminal;
 228         }
 229         return -1;
 230
 231 deadloop:
 232         if (net_ratelimit())
 233                 printk("cls_u32: dead loop\n");
 234         return -1;
 235 }
 236
 237 static __inline__ struct tc_u_hnode *
 238 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 239 {
 240         struct tc_u_hnode *ht;
 241
 242         for (ht = tp_c->hlist; ht; ht = ht->next)
 243                 if (ht->handle == handle)
 244                         break;
 245
 246         return ht;
 247 }
 248
 249 static __inline__ struct tc_u_knode *
 250 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 251 {
 252         unsigned sel;
 253         struct tc_u_knode *n = NULL;
 254
 255         sel = TC_U32_HASH(handle);
 256         if (sel > ht->divisor)
 257                 goto out;
 258
 259         for (n = ht->ht[sel]; n; n = n->next)
 260                 if (n->handle == handle)
 261                         break;
 262 out:
 263         return n;
 264 }
 265
 266
 267 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 268 {
 269         struct tc_u_hnode *ht;
 270         struct tc_u_common *tp_c = tp->data;
 271
 272         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 273                 ht = tp->root;
 274         else
 275                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 276
 277         if (!ht)
 278                 return 0;
 279
 280         if (TC_U32_KEY(handle) == 0)
 281                 return (unsigned long)ht;
 282
 283         return (unsigned long)u32_lookup_key(ht, handle);
 284 }
 285
 286 static void u32_put(struct tcf_proto *tp, unsigned long f)
 287 {
 288 }
 289
 290 static u32 gen_new_htid(struct tc_u_common *tp_c)
 291 {
 292         int i = 0x800;
 293
 294         do {
 295                 if (++tp_c->hgenerator == 0x7FF)
 296                         tp_c->hgenerator = 1;
 297         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 298
 299         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 300 }
 301
 302 static int u32_init(struct tcf_proto *tp)
 303 {
 304         struct tc_u_hnode *root_ht;
 305         struct tc_u_common *tp_c;
 306
 307         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 308                 if (tp_c->q == tp->q)
 309                         break;
 310
 311         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 312         if (root_ht == NULL)
 313                 return -ENOBUFS;
 314
 315         memset(root_ht, 0, sizeof(*root_ht));
 316         root_ht->divisor = 0;
 317         root_ht->refcnt++;
 318         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 319         root_ht->prio = tp->prio;
 320
 321         if (tp_c == NULL) {
 322                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 323                 if (tp_c == NULL) {
 324                         kfree(root_ht);
 325                         return -ENOBUFS;
 326                 }
 327                 memset(tp_c, 0, sizeof(*tp_c));
 328                 tp_c->q = tp->q;
 329                 tp_c->next = u32_list;
 330                 u32_list = 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         BUG_TRAP(0);
 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 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         BUG_TRAP(!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         BUG_TRAP(0);
 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 = xchg(&tp->root, NULL);
 416
 417         BUG_TRAP(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                 struct tc_u_common **tp_cp;
 425
 426                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 427                         if (*tp_cp == tp_c) {
 428                                 *tp_cp = tp_c->next;
 429                                 break;
 430                         }
 431                 }
 432
 433                 for (ht=tp_c->hlist; ht; ht = ht->next)
 434                         u32_clear_hnode(tp, ht);
 435
 436                 while ((ht = tp_c->hlist) != NULL) {
 437                         tp_c->hlist = ht->next;
 438
 439                         BUG_TRAP(ht->refcnt == 0);
 440
 441                         kfree(ht);
 442                 };
 443
 444                 kfree(tp_c);
 445         }
 446
 447         tp->data = NULL;
 448 }
 449
 450 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 451 {
 452         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 453
 454         if (ht == NULL)
 455                 return 0;
 456
 457         if (TC_U32_KEY(ht->handle))
 458                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 459
 460         if (tp->root == ht)
 461                 return -EINVAL;
 462
 463         if (--ht->refcnt == 0)
 464                 u32_destroy_hnode(tp, ht);
 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 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 int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 483                          struct tc_u_hnode *ht,
 484                          struct tc_u_knode *n, struct rtattr **tb,
 485                          struct rtattr *est)
 486 {
 487         int err;
 488         struct tcf_exts e;
 489
 490         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 491         if (err < 0)
 492                 return err;
 493
 494         err = -EINVAL;
 495         if (tb[TCA_U32_LINK-1]) {
 496                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 497                 struct tc_u_hnode *ht_down = NULL;
 498
 499                 if (TC_U32_KEY(handle))
 500                         goto errout;
 501
 502                 if (handle) {
 503                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 504
 505                         if (ht_down == NULL)
 506                                 goto errout;
 507                         ht_down->refcnt++;
 508                 }
 509
 510                 tcf_tree_lock(tp);
 511                 ht_down = xchg(&n->ht_down, ht_down);
 512                 tcf_tree_unlock(tp);
 513
 514                 if (ht_down)
 515                         ht_down->refcnt--;
 516         }
 517         if (tb[TCA_U32_CLASSID-1]) {
 518                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 519                 tcf_bind_filter(tp, &n->res, base);
 520         }
 521
 522 #ifdef CONFIG_NET_CLS_IND
 523         if (tb[TCA_U32_INDEV-1]) {
 524                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 525                 if (err < 0)
 526                         goto errout;
 527         }
 528 #endif
 529         tcf_exts_change(tp, &n->exts, &e);
 530
 531         return 0;
 532 errout:
 533         tcf_exts_destroy(tp, &e);
 534         return err;
 535 }
 536
 537 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 538                       struct rtattr **tca,
 539                       unsigned long *arg)
 540 {
 541         struct tc_u_common *tp_c = tp->data;
 542         struct tc_u_hnode *ht;
 543         struct tc_u_knode *n;
 544         struct tc_u32_sel *s;
 545         struct rtattr *opt = tca[TCA_OPTIONS-1];
 546         struct rtattr *tb[TCA_U32_MAX];
 547         u32 htid;
 548         int err;
 549
 550         if (opt == NULL)
 551                 return handle ? -EINVAL : 0;
 552
 553         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
 554                 return -EINVAL;
 555
 556         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 557                 if (TC_U32_KEY(n->handle) == 0)
 558                         return -EINVAL;
 559
 560                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 561         }
 562
 563         if (tb[TCA_U32_DIVISOR-1]) {
 564                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 565
 566                 if (--divisor > 0x100)
 567                         return -EINVAL;
 568                 if (TC_U32_KEY(handle))
 569                         return -EINVAL;
 570                 if (handle == 0) {
 571                         handle = gen_new_htid(tp->data);
 572                         if (handle == 0)
 573                                 return -ENOMEM;
 574                 }
 575                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 576                 if (ht == NULL)
 577                         return -ENOBUFS;
 578                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 579                 ht->tp_c = tp_c;
 580                 ht->refcnt = 0;
 581                 ht->divisor = divisor;
 582                 ht->handle = handle;
 583                 ht->prio = tp->prio;
 584                 ht->next = tp_c->hlist;
 585                 tp_c->hlist = ht;
 586                 *arg = (unsigned long)ht;
 587                 return 0;
 588         }
 589
 590         if (tb[TCA_U32_HASH-1]) {
 591                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 592                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 593                         ht = tp->root;
 594                         htid = ht->handle;
 595                 } else {
 596                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 597                         if (ht == NULL)
 598                                 return -EINVAL;
 599                 }
 600         } else {
 601                 ht = tp->root;
 602                 htid = ht->handle;
 603         }
 604
 605         if (ht->divisor < TC_U32_HASH(htid))
 606                 return -EINVAL;
 607
 608         if (handle) {
 609                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 610                         return -EINVAL;
 611                 handle = htid | TC_U32_NODE(handle);
 612         } else
 613                 handle = gen_new_kid(ht, htid);
 614
 615         if (tb[TCA_U32_SEL-1] == 0 ||
 616             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 617                 return -EINVAL;
 618
 619         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 620
 621         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 622         if (n == NULL)
 623                 return -ENOBUFS;
 624
 625         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 626 #ifdef CONFIG_CLS_U32_PERF
 627         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 628         if (n->pf == NULL) {
 629                 kfree(n);
 630                 return -ENOBUFS;
 631         }
 632         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
 633 #endif
 634
 635         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 636         n->ht_up = ht;
 637         n->handle = handle;
 638 {
 639         u8 i = 0;
 640         u32 mask = s->hmask;
 641         if (mask) {
 642                 while (!(mask & 1)) {
 643                         i++;
 644                         mask>>=1;
 645                 }
 646         }
 647         n->fshift = i;
 648 }
 649
 650 #ifdef CONFIG_CLS_U32_MARK
 651         if (tb[TCA_U32_MARK-1]) {
 652                 struct tc_u32_mark *mark;
 653
 654                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
 655 #ifdef CONFIG_CLS_U32_PERF
 656                         kfree(n->pf);
 657 #endif
 658                         kfree(n);
 659                         return -EINVAL;
 660                 }
 661                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
 662                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 663                 n->mark.success = 0;
 664         }
 665 #endif
 666
 667         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 668         if (err == 0) {
 669                 struct tc_u_knode **ins;
 670                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 671                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 672                                 break;
 673
 674                 n->next = *ins;
 675                 wmb();
 676                 *ins = n;
 677
 678                 *arg = (unsigned long)n;
 679                 return 0;
 680         }
 681 #ifdef CONFIG_CLS_U32_PERF
 682         kfree(n->pf);
 683 #endif
 684         kfree(n);
 685         return err;
 686 }
 687
 688 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 689 {
 690         struct tc_u_common *tp_c = tp->data;
 691         struct tc_u_hnode *ht;
 692         struct tc_u_knode *n;
 693         unsigned h;
 694
 695         if (arg->stop)
 696                 return;
 697
 698         for (ht = tp_c->hlist; ht; ht = ht->next) {
 699                 if (ht->prio != tp->prio)
 700                         continue;
 701                 if (arg->count >= arg->skip) {
 702                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 703                                 arg->stop = 1;
 704                                 return;
 705                         }
 706                 }
 707                 arg->count++;
 708                 for (h = 0; h <= ht->divisor; h++) {
 709                         for (n = ht->ht[h]; n; n = n->next) {
 710                                 if (arg->count < arg->skip) {
 711                                         arg->count++;
 712                                         continue;
 713                                 }
 714                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 715                                         arg->stop = 1;
 716                                         return;
 717                                 }
 718                                 arg->count++;
 719                         }
 720                 }
 721         }
 722 }
 723
 724 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 725                      struct sk_buff *skb, struct tcmsg *t)
 726 {
 727         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 728         unsigned char    *b = skb->tail;
 729         struct rtattr *rta;
 730
 731         if (n == NULL)
 732                 return skb->len;
 733
 734         t->tcm_handle = n->handle;
 735
 736         rta = (struct rtattr*)b;
 737         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 738
 739         if (TC_U32_KEY(n->handle) == 0) {
 740                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 741                 u32 divisor = ht->divisor+1;
 742                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 743         } else {
 744                 RTA_PUT(skb, TCA_U32_SEL,
 745                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 746                         &n->sel);
 747                 if (n->ht_up) {
 748                         u32 htid = n->handle & 0xFFFFF000;
 749                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 750                 }
 751                 if (n->res.classid)
 752                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 753                 if (n->ht_down)
 754                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 755
 756 #ifdef CONFIG_CLS_U32_MARK
 757                 if (n->mark.val || n->mark.mask)
 758                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 759 #endif
 760
 761                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 762                         goto rtattr_failure;
 763
 764 #ifdef CONFIG_NET_CLS_IND
 765                 if(strlen(n->indev))
 766                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 767 #endif
 768 #ifdef CONFIG_CLS_U32_PERF
 769                 RTA_PUT(skb, TCA_U32_PCNT,
 770                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 771                         n->pf);
 772 #endif
 773         }
 774
 775         rta->rta_len = skb->tail - b;
 776         if (TC_U32_KEY(n->handle))
 777                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 778                         goto rtattr_failure;
 779         return skb->len;
 780
 781 rtattr_failure:
 782         skb_trim(skb, b - skb->data);
 783         return -1;
 784 }
 785
 786 static struct tcf_proto_ops cls_u32_ops = {
 787         .next           =       NULL,
 788         .kind           =       "u32",
 789         .classify       =       u32_classify,
 790         .init           =       u32_init,
 791         .destroy        =       u32_destroy,
 792         .get            =       u32_get,
 793         .put            =       u32_put,
 794         .change         =       u32_change,
 795         .delete         =       u32_delete,
 796         .walk           =       u32_walk,
 797         .dump           =       u32_dump,
 798         .owner          =       THIS_MODULE,
 799 };
 800
 801 static int __init init_u32(void)
 802 {
 803         printk("u32 classifier\n");
 804 #ifdef CONFIG_CLS_U32_PERF
 805         printk("    Perfomance counters on\n");
 806 #endif
 807 #ifdef CONFIG_NET_CLS_POLICE
 808         printk("    OLD policer on \n");
 809 #endif
 810 #ifdef CONFIG_NET_CLS_IND
 811         printk("    input device check on \n");
 812 #endif
 813 #ifdef CONFIG_NET_CLS_ACT
 814         printk("    Actions configured \n");
 815 #endif
 816         return register_tcf_proto_ops(&cls_u32_ops);
 817 }
 818
 819 static void __exit exit_u32(void)
 820 {
 821         unregister_tcf_proto_ops(&cls_u32_ops);
 822 }
 823
 824 module_init(init_u32)
 825 module_exit(exit_u32)
 826 MODULE_LICENSE("GPL");