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
  62 struct tc_u32_mark
  63 {
  64         u32             val;
  65         u32             mask;
  66         u32             success;
  67 };
  68
  69 struct tc_u_knode
  70 {
  71         struct tc_u_knode       *next;
  72         u32                     handle;
  73         struct tc_u_hnode       *ht_up;
  74         struct tcf_exts         exts;
  75 #ifdef CONFIG_NET_CLS_IND
  76         char                     indev[IFNAMSIZ];
  77 #endif
  78         u8                      fshift;
  79         struct tcf_result       res;
  80         struct tc_u_hnode       *ht_down;
  81 #ifdef CONFIG_CLS_U32_PERF
  82         struct tc_u32_pcnt      *pf;
  83 #endif
  84 #ifdef CONFIG_CLS_U32_MARK
  85         struct tc_u32_mark      mark;
  86 #endif
  87         struct tc_u32_sel       sel;
  88 };
  89
  90 struct tc_u_hnode
  91 {
  92         struct tc_u_hnode       *next;
  93         u32                     handle;
  94         u32                     prio;
  95         struct tc_u_common      *tp_c;
  96         int                     refcnt;
  97         unsigned                divisor;
  98         struct tc_u_knode       *ht[1];
  99 };
 100
 101 struct tc_u_common
 102 {
 103         struct tc_u_common      *next;
 104         struct tc_u_hnode       *hlist;
 105         struct Qdisc            *q;
 106         int                     refcnt;
 107         u32                     hgenerator;
 108 };
 109
 110 static struct tcf_ext_map u32_ext_map = {
 111         .action = TCA_U32_ACT,
 112         .police = TCA_U32_POLICE
 113 };
 114
 115 static struct tc_u_common *u32_list;
 116
 117 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 118 {
 119         unsigned h = (key & sel->hmask)>>fshift;
 120
 121         return h;
 122 }
 123
 124 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 125 {
 126         struct {
 127                 struct tc_u_knode *knode;
 128                 u8                *ptr;
 129         } stack[TC_U32_MAXDEPTH];
 130
 131         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 132         u8 *ptr = skb->nh.raw;
 133         struct tc_u_knode *n;
 134         int sdepth = 0;
 135         int off2 = 0;
 136         int sel = 0;
 137 #ifdef CONFIG_CLS_U32_PERF
 138         int j;
 139 #endif
 140         int i, r;
 141
 142 next_ht:
 143         n = ht->ht[sel];
 144
 145 next_knode:
 146         if (n) {
 147                 struct tc_u32_key *key = n->sel.keys;
 148
 149 #ifdef CONFIG_CLS_U32_PERF
 150                 n->pf->rcnt +=1;
 151                 j = 0;
 152 #endif
 153
 154 #ifdef CONFIG_CLS_U32_MARK
 155                 if ((skb->nfmark & n->mark.mask) != n->mark.val) {
 156                         n = n->next;
 157                         goto next_knode;
 158                 } else {
 159                         n->mark.success++;
 160                 }
 161 #endif
 162
 163                 for (i = n->sel.nkeys; i>0; i--, key++) {
 164
 165                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 166                                 n = n->next;
 167                                 goto next_knode;
 168                         }
 169 #ifdef CONFIG_CLS_U32_PERF
 170                         n->pf->kcnts[j] +=1;
 171                         j++;
 172 #endif
 173                 }
 174                 if (n->ht_down == NULL) {
 175 check_terminal:
 176                         if (n->sel.flags&TC_U32_TERMINAL) {
 177
 178                                 *res = n->res;
 179 #ifdef CONFIG_NET_CLS_IND
 180                                 if (!tcf_match_indev(skb, n->indev)) {
 181                                         n = n->next;
 182                                         goto next_knode;
 183                                 }
 184 #endif
 185 #ifdef CONFIG_CLS_U32_PERF
 186                                 n->pf->rhit +=1;
 187 #endif
 188                                 r = tcf_exts_exec(skb, &n->exts, res);
 189                                 if (r < 0) {
 190                                         n = n->next;
 191                                         goto next_knode;
 192                                 }
 193
 194                                 return r;
 195                         }
 196                         n = n->next;
 197                         goto next_knode;
 198                 }
 199
 200                 /* PUSH */
 201                 if (sdepth >= TC_U32_MAXDEPTH)
 202                         goto deadloop;
 203                 stack[sdepth].knode = n;
 204                 stack[sdepth].ptr = ptr;
 205                 sdepth++;
 206
 207                 ht = n->ht_down;
 208                 sel = 0;
 209                 if (ht->divisor)
 210                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 211
 212                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 213                         goto next_ht;
 214
 215                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 216                         off2 = n->sel.off + 3;
 217                         if (n->sel.flags&TC_U32_VAROFFSET)
 218                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 219                         off2 &= ~3;
 220                 }
 221                 if (n->sel.flags&TC_U32_EAT) {
 222                         ptr += off2;
 223                         off2 = 0;
 224                 }
 225
 226                 if (ptr < skb->tail)
 227                         goto next_ht;
 228         }
 229
 230         /* POP */
 231         if (sdepth--) {
 232                 n = stack[sdepth].knode;
 233                 ht = n->ht_up;
 234                 ptr = stack[sdepth].ptr;
 235                 goto check_terminal;
 236         }
 237         return -1;
 238
 239 deadloop:
 240         if (net_ratelimit())
 241                 printk("cls_u32: dead loop\n");
 242         return -1;
 243 }
 244
 245 static __inline__ struct tc_u_hnode *
 246 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 247 {
 248         struct tc_u_hnode *ht;
 249
 250         for (ht = tp_c->hlist; ht; ht = ht->next)
 251                 if (ht->handle == handle)
 252                         break;
 253
 254         return ht;
 255 }
 256
 257 static __inline__ struct tc_u_knode *
 258 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 259 {
 260         unsigned sel;
 261         struct tc_u_knode *n = NULL;
 262
 263         sel = TC_U32_HASH(handle);
 264         if (sel > ht->divisor)
 265                 goto out;
 266
 267         for (n = ht->ht[sel]; n; n = n->next)
 268                 if (n->handle == handle)
 269                         break;
 270 out:
 271         return n;
 272 }
 273
 274
 275 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 276 {
 277         struct tc_u_hnode *ht;
 278         struct tc_u_common *tp_c = tp->data;
 279
 280         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 281                 ht = tp->root;
 282         else
 283                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 284
 285         if (!ht)
 286                 return 0;
 287
 288         if (TC_U32_KEY(handle) == 0)
 289                 return (unsigned long)ht;
 290
 291         return (unsigned long)u32_lookup_key(ht, handle);
 292 }
 293
 294 static void u32_put(struct tcf_proto *tp, unsigned long f)
 295 {
 296 }
 297
 298 static u32 gen_new_htid(struct tc_u_common *tp_c)
 299 {
 300         int i = 0x800;
 301
 302         do {
 303                 if (++tp_c->hgenerator == 0x7FF)
 304                         tp_c->hgenerator = 1;
 305         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 306
 307         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 308 }
 309
 310 static int u32_init(struct tcf_proto *tp)
 311 {
 312         struct tc_u_hnode *root_ht;
 313         struct tc_u_common *tp_c;
 314
 315         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 316                 if (tp_c->q == tp->q)
 317                         break;
 318
 319         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 320         if (root_ht == NULL)
 321                 return -ENOBUFS;
 322
 323         memset(root_ht, 0, sizeof(*root_ht));
 324         root_ht->divisor = 0;
 325         root_ht->refcnt++;
 326         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 327         root_ht->prio = tp->prio;
 328
 329         if (tp_c == NULL) {
 330                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 331                 if (tp_c == NULL) {
 332                         kfree(root_ht);
 333                         return -ENOBUFS;
 334                 }
 335                 memset(tp_c, 0, sizeof(*tp_c));
 336                 tp_c->q = tp->q;
 337                 tp_c->next = u32_list;
 338                 u32_list = tp_c;
 339         }
 340
 341         tp_c->refcnt++;
 342         root_ht->next = tp_c->hlist;
 343         tp_c->hlist = root_ht;
 344         root_ht->tp_c = tp_c;
 345
 346         tp->root = root_ht;
 347         tp->data = tp_c;
 348         return 0;
 349 }
 350
 351 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 352 {
 353         tcf_unbind_filter(tp, &n->res);
 354         tcf_exts_destroy(tp, &n->exts);
 355         if (n->ht_down)
 356                 n->ht_down->refcnt--;
 357 #ifdef CONFIG_CLS_U32_PERF
 358         if (n && (NULL != n->pf))
 359                 kfree(n->pf);
 360 #endif
 361         kfree(n);
 362         return 0;
 363 }
 364
 365 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 366 {
 367         struct tc_u_knode **kp;
 368         struct tc_u_hnode *ht = key->ht_up;
 369
 370         if (ht) {
 371                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 372                         if (*kp == key) {
 373                                 tcf_tree_lock(tp);
 374                                 *kp = key->next;
 375                                 tcf_tree_unlock(tp);
 376
 377                                 u32_destroy_key(tp, key);
 378                                 return 0;
 379                         }
 380                 }
 381         }
 382         BUG_TRAP(0);
 383         return 0;
 384 }
 385
 386 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 387 {
 388         struct tc_u_knode *n;
 389         unsigned h;
 390
 391         for (h=0; h<=ht->divisor; h++) {
 392                 while ((n = ht->ht[h]) != NULL) {
 393                         ht->ht[h] = n->next;
 394
 395                         u32_destroy_key(tp, n);
 396                 }
 397         }
 398 }
 399
 400 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 401 {
 402         struct tc_u_common *tp_c = tp->data;
 403         struct tc_u_hnode **hn;
 404
 405         BUG_TRAP(!ht->refcnt);
 406
 407         u32_clear_hnode(tp, ht);
 408
 409         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 410                 if (*hn == ht) {
 411                         *hn = ht->next;
 412                         kfree(ht);
 413                         return 0;
 414                 }
 415         }
 416
 417         BUG_TRAP(0);
 418         return -ENOENT;
 419 }
 420
 421 static void u32_destroy(struct tcf_proto *tp)
 422 {
 423         struct tc_u_common *tp_c = tp->data;
 424         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 425
 426         BUG_TRAP(root_ht != NULL);
 427
 428         if (root_ht && --root_ht->refcnt == 0)
 429                 u32_destroy_hnode(tp, root_ht);
 430
 431         if (--tp_c->refcnt == 0) {
 432                 struct tc_u_hnode *ht;
 433                 struct tc_u_common **tp_cp;
 434
 435                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 436                         if (*tp_cp == tp_c) {
 437                                 *tp_cp = tp_c->next;
 438                                 break;
 439                         }
 440                 }
 441
 442                 for (ht=tp_c->hlist; ht; ht = ht->next)
 443                         u32_clear_hnode(tp, ht);
 444
 445                 while ((ht = tp_c->hlist) != NULL) {
 446                         tp_c->hlist = ht->next;
 447
 448                         BUG_TRAP(ht->refcnt == 0);
 449
 450                         kfree(ht);
 451                 };
 452
 453                 kfree(tp_c);
 454         }
 455
 456         tp->data = NULL;
 457 }
 458
 459 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 460 {
 461         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 462
 463         if (ht == NULL)
 464                 return 0;
 465
 466         if (TC_U32_KEY(ht->handle))
 467                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 468
 469         if (tp->root == ht)
 470                 return -EINVAL;
 471
 472         if (--ht->refcnt == 0)
 473                 u32_destroy_hnode(tp, ht);
 474
 475         return 0;
 476 }
 477
 478 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 479 {
 480         struct tc_u_knode *n;
 481         unsigned i = 0x7FF;
 482
 483         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 484                 if (i < TC_U32_NODE(n->handle))
 485                         i = TC_U32_NODE(n->handle);
 486         i++;
 487
 488         return handle|(i>0xFFF ? 0xFFF : i);
 489 }
 490
 491 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 492                          struct tc_u_hnode *ht,
 493                          struct tc_u_knode *n, struct rtattr **tb,
 494                          struct rtattr *est)
 495 {
 496         int err;
 497         struct tcf_exts e;
 498
 499         err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 500         if (err < 0)
 501                 return err;
 502
 503         err = -EINVAL;
 504         if (tb[TCA_U32_LINK-1]) {
 505                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 506                 struct tc_u_hnode *ht_down = NULL;
 507
 508                 if (TC_U32_KEY(handle))
 509                         goto errout;
 510
 511                 if (handle) {
 512                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 513
 514                         if (ht_down == NULL)
 515                                 goto errout;
 516                         ht_down->refcnt++;
 517                 }
 518
 519                 tcf_tree_lock(tp);
 520                 ht_down = xchg(&n->ht_down, ht_down);
 521                 tcf_tree_unlock(tp);
 522
 523                 if (ht_down)
 524                         ht_down->refcnt--;
 525         }
 526         if (tb[TCA_U32_CLASSID-1]) {
 527                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 528                 tcf_bind_filter(tp, &n->res, base);
 529         }
 530
 531 #ifdef CONFIG_NET_CLS_IND
 532         if (tb[TCA_U32_INDEV-1]) {
 533                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 534                 if (err < 0)
 535                         goto errout;
 536         }
 537 #endif
 538         tcf_exts_change(tp, &n->exts, &e);
 539
 540         return 0;
 541 errout:
 542         tcf_exts_destroy(tp, &e);
 543         return err;
 544 }
 545
 546 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 547                       struct rtattr **tca,
 548                       unsigned long *arg)
 549 {
 550         struct tc_u_common *tp_c = tp->data;
 551         struct tc_u_hnode *ht;
 552         struct tc_u_knode *n;
 553         struct tc_u32_sel *s;
 554         struct rtattr *opt = tca[TCA_OPTIONS-1];
 555         struct rtattr *tb[TCA_U32_MAX];
 556         u32 htid;
 557         int err;
 558
 559         if (opt == NULL)
 560                 return handle ? -EINVAL : 0;
 561
 562         if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0)
 563                 return -EINVAL;
 564
 565         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 566                 if (TC_U32_KEY(n->handle) == 0)
 567                         return -EINVAL;
 568
 569                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 570         }
 571
 572         if (tb[TCA_U32_DIVISOR-1]) {
 573                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 574
 575                 if (--divisor > 0x100)
 576                         return -EINVAL;
 577                 if (TC_U32_KEY(handle))
 578                         return -EINVAL;
 579                 if (handle == 0) {
 580                         handle = gen_new_htid(tp->data);
 581                         if (handle == 0)
 582                                 return -ENOMEM;
 583                 }
 584                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 585                 if (ht == NULL)
 586                         return -ENOBUFS;
 587                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 588                 ht->tp_c = tp_c;
 589                 ht->refcnt = 0;
 590                 ht->divisor = divisor;
 591                 ht->handle = handle;
 592                 ht->prio = tp->prio;
 593                 ht->next = tp_c->hlist;
 594                 tp_c->hlist = ht;
 595                 *arg = (unsigned long)ht;
 596                 return 0;
 597         }
 598
 599         if (tb[TCA_U32_HASH-1]) {
 600                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 601                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 602                         ht = tp->root;
 603                         htid = ht->handle;
 604                 } else {
 605                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 606                         if (ht == NULL)
 607                                 return -EINVAL;
 608                 }
 609         } else {
 610                 ht = tp->root;
 611                 htid = ht->handle;
 612         }
 613
 614         if (ht->divisor < TC_U32_HASH(htid))
 615                 return -EINVAL;
 616
 617         if (handle) {
 618                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 619                         return -EINVAL;
 620                 handle = htid | TC_U32_NODE(handle);
 621         } else
 622                 handle = gen_new_kid(ht, htid);
 623
 624         if (tb[TCA_U32_SEL-1] == 0 ||
 625             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 626                 return -EINVAL;
 627
 628         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 629
 630         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 631         if (n == NULL)
 632                 return -ENOBUFS;
 633
 634         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 635 #ifdef CONFIG_CLS_U32_PERF
 636         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 637         if (n->pf == NULL) {
 638                 kfree(n);
 639                 return -ENOBUFS;
 640         }
 641         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64));
 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 {
 648         u8 i = 0;
 649         u32 mask = s->hmask;
 650         if (mask) {
 651                 while (!(mask & 1)) {
 652                         i++;
 653                         mask>>=1;
 654                 }
 655         }
 656         n->fshift = i;
 657 }
 658
 659 #ifdef CONFIG_CLS_U32_MARK
 660         if (tb[TCA_U32_MARK-1]) {
 661                 struct tc_u32_mark *mark;
 662
 663                 if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) {
 664 #ifdef CONFIG_CLS_U32_PERF
 665                         kfree(n->pf);
 666 #endif
 667                         kfree(n);
 668                         return -EINVAL;
 669                 }
 670                 mark = RTA_DATA(tb[TCA_U32_MARK-1]);
 671                 memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 672                 n->mark.success = 0;
 673         }
 674 #endif
 675
 676         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 677         if (err == 0) {
 678                 struct tc_u_knode **ins;
 679                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 680                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 681                                 break;
 682
 683                 n->next = *ins;
 684                 wmb();
 685                 *ins = n;
 686
 687                 *arg = (unsigned long)n;
 688                 return 0;
 689         }
 690 #ifdef CONFIG_CLS_U32_PERF
 691         if (n && (NULL != n->pf))
 692                 kfree(n->pf);
 693 #endif
 694         kfree(n);
 695         return err;
 696 }
 697
 698 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 699 {
 700         struct tc_u_common *tp_c = tp->data;
 701         struct tc_u_hnode *ht;
 702         struct tc_u_knode *n;
 703         unsigned h;
 704
 705         if (arg->stop)
 706                 return;
 707
 708         for (ht = tp_c->hlist; ht; ht = ht->next) {
 709                 if (ht->prio != tp->prio)
 710                         continue;
 711                 if (arg->count >= arg->skip) {
 712                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 713                                 arg->stop = 1;
 714                                 return;
 715                         }
 716                 }
 717                 arg->count++;
 718                 for (h = 0; h <= ht->divisor; h++) {
 719                         for (n = ht->ht[h]; n; n = n->next) {
 720                                 if (arg->count < arg->skip) {
 721                                         arg->count++;
 722                                         continue;
 723                                 }
 724                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 725                                         arg->stop = 1;
 726                                         return;
 727                                 }
 728                                 arg->count++;
 729                         }
 730                 }
 731         }
 732 }
 733
 734 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 735                      struct sk_buff *skb, struct tcmsg *t)
 736 {
 737         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 738         unsigned char    *b = skb->tail;
 739         struct rtattr *rta;
 740
 741         if (n == NULL)
 742                 return skb->len;
 743
 744         t->tcm_handle = n->handle;
 745
 746         rta = (struct rtattr*)b;
 747         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 748
 749         if (TC_U32_KEY(n->handle) == 0) {
 750                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 751                 u32 divisor = ht->divisor+1;
 752                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 753         } else {
 754                 RTA_PUT(skb, TCA_U32_SEL,
 755                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 756                         &n->sel);
 757                 if (n->ht_up) {
 758                         u32 htid = n->handle & 0xFFFFF000;
 759                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 760                 }
 761                 if (n->res.classid)
 762                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 763                 if (n->ht_down)
 764                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 765
 766 #ifdef CONFIG_CLS_U32_MARK
 767                 if (n->mark.val || n->mark.mask)
 768                         RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 769 #endif
 770
 771                 if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 772                         goto rtattr_failure;
 773
 774 #ifdef CONFIG_NET_CLS_IND
 775                 if(strlen(n->indev))
 776                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 777 #endif
 778 #ifdef CONFIG_CLS_U32_PERF
 779                 RTA_PUT(skb, TCA_U32_PCNT,
 780                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 781                         n->pf);
 782 #endif
 783         }
 784
 785         rta->rta_len = skb->tail - b;
 786         if (TC_U32_KEY(n->handle))
 787                 if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 788                         goto rtattr_failure;
 789         return skb->len;
 790
 791 rtattr_failure:
 792         skb_trim(skb, b - skb->data);
 793         return -1;
 794 }
 795
 796 static struct tcf_proto_ops cls_u32_ops = {
 797         .next           =       NULL,
 798         .kind           =       "u32",
 799         .classify       =       u32_classify,
 800         .init           =       u32_init,
 801         .destroy        =       u32_destroy,
 802         .get            =       u32_get,
 803         .put            =       u32_put,
 804         .change         =       u32_change,
 805         .delete         =       u32_delete,
 806         .walk           =       u32_walk,
 807         .dump           =       u32_dump,
 808         .owner          =       THIS_MODULE,
 809 };
 810
 811 static int __init init_u32(void)
 812 {
 813         printk("u32 classifier\n");
 814 #ifdef CONFIG_CLS_U32_PERF
 815         printk("    Perfomance counters on\n");
 816 #endif
 817 #ifdef CONFIG_NET_CLS_POLICE
 818         printk("    OLD policer on \n");
 819 #endif
 820 #ifdef CONFIG_NET_CLS_IND
 821         printk("    input device check on \n");
 822 #endif
 823 #ifdef CONFIG_NET_CLS_ACT
 824         printk("    Actions configured \n");
 825 #endif
 826         return register_tcf_proto_ops(&cls_u32_ops);
 827 }
 828
 829 static void __exit exit_u32(void)
 830 {
 831         unregister_tcf_proto_ops(&cls_u32_ops);
 832 }
 833
 834 module_init(init_u32)
 835 module_exit(exit_u32)
 836 MODULE_LICENSE("GPL");