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  */
  31
  32 #include <asm/uaccess.h>
  33 #include <asm/system.h>
  34 #include <linux/bitops.h>
  35 #include <linux/config.h>
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/kernel.h>
  39 #include <linux/sched.h>
  40 #include <linux/string.h>
  41 #include <linux/mm.h>
  42 #include <linux/socket.h>
  43 #include <linux/sockios.h>
  44 #include <linux/in.h>
  45 #include <linux/errno.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/if_ether.h>
  48 #include <linux/inet.h>
  49 #include <linux/netdevice.h>
  50 #include <linux/etherdevice.h>
  51 #include <linux/notifier.h>
  52 #include <linux/rtnetlink.h>
  53 #include <net/ip.h>
  54 #include <net/route.h>
  55 #include <linux/skbuff.h>
  56 #include <net/sock.h>
  57 #include <net/act_api.h>
  58 #include <net/pkt_cls.h>
  59
  60
  61 struct tc_u_knode
  62 {
  63         struct tc_u_knode       *next;
  64         u32                     handle;
  65         struct tc_u_hnode       *ht_up;
  66 #ifdef CONFIG_NET_CLS_ACT
  67         struct tc_action        *action;
  68 #else
  69 #ifdef CONFIG_NET_CLS_POLICE
  70         struct tcf_police       *police;
  71 #endif
  72 #endif
  73 #ifdef CONFIG_NET_CLS_IND
  74         char                     indev[IFNAMSIZ];
  75 #endif
  76         u8                      fshift;
  77         struct tcf_result       res;
  78         struct tc_u_hnode       *ht_down;
  79 #ifdef CONFIG_CLS_U32_PERF
  80         struct tc_u32_pcnt      *pf;
  81 #endif
  82         struct tc_u32_sel       sel;
  83 };
  84
  85 struct tc_u_hnode
  86 {
  87         struct tc_u_hnode       *next;
  88         u32                     handle;
  89         struct tc_u_common      *tp_c;
  90         int                     refcnt;
  91         unsigned                divisor;
  92         struct tc_u_knode       *ht[1];
  93 };
  94
  95 struct tc_u_common
  96 {
  97         struct tc_u_common      *next;
  98         struct tc_u_hnode       *hlist;
  99         struct Qdisc            *q;
 100         int                     refcnt;
 101         u32                     hgenerator;
 102 };
 103
 104 static struct tc_u_common *u32_list;
 105
 106 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 107 {
 108         unsigned h = (key & sel->hmask)>>fshift;
 109
 110         return h;
 111 }
 112
 113 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 114 {
 115         struct {
 116                 struct tc_u_knode *knode;
 117                 u8                *ptr;
 118         } stack[TC_U32_MAXDEPTH];
 119
 120         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 121         u8 *ptr = skb->nh.raw;
 122         struct tc_u_knode *n;
 123         int sdepth = 0;
 124         int off2 = 0;
 125         int sel = 0;
 126 #ifdef CONFIG_CLS_U32_PERF
 127         int j;
 128 #endif
 129         int i;
 130
 131 next_ht:
 132         n = ht->ht[sel];
 133
 134 next_knode:
 135         if (n) {
 136                 struct tc_u32_key *key = n->sel.keys;
 137
 138 #ifdef CONFIG_CLS_U32_PERF
 139                 n->pf->rcnt +=1;
 140                 j = 0;
 141 #endif
 142                 for (i = n->sel.nkeys; i>0; i--, key++) {
 143
 144                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 145                                 n = n->next;
 146                                 goto next_knode;
 147                         }
 148 #ifdef CONFIG_CLS_U32_PERF
 149                         n->pf->kcnts[j] +=1;
 150                         j++;
 151 #endif
 152                 }
 153                 if (n->ht_down == NULL) {
 154 check_terminal:
 155                         if (n->sel.flags&TC_U32_TERMINAL) {
 156
 157                                 *res = n->res;
 158 #ifdef CONFIG_NET_CLS_IND
 159                                 if (!tcf_match_indev(skb, n->indev)) {
 160                                         n = n->next;
 161                                         goto next_knode;
 162                                 }
 163 #endif
 164 #ifdef CONFIG_CLS_U32_PERF
 165                                 n->pf->rhit +=1;
 166 #endif
 167 #ifdef CONFIG_NET_CLS_ACT
 168                                 if (n->action) {
 169                                         int pol_res = tcf_action_exec(skb, n->action, res);
 170                                         if (pol_res >= 0)
 171                                                 return pol_res;
 172                                 } else
 173 #else
 174 #ifdef CONFIG_NET_CLS_POLICE
 175                                 if (n->police) {
 176                                         int pol_res = tcf_police(skb, n->police);
 177                                         if (pol_res >= 0)
 178                                                 return pol_res;
 179                                 } else
 180 #endif
 181 #endif
 182                                         return 0;
 183                         }
 184                         n = n->next;
 185                         goto next_knode;
 186                 }
 187
 188                 /* PUSH */
 189                 if (sdepth >= TC_U32_MAXDEPTH)
 190                         goto deadloop;
 191                 stack[sdepth].knode = n;
 192                 stack[sdepth].ptr = ptr;
 193                 sdepth++;
 194
 195                 ht = n->ht_down;
 196                 sel = 0;
 197                 if (ht->divisor)
 198                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 199
 200                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 201                         goto next_ht;
 202
 203                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 204                         off2 = n->sel.off + 3;
 205                         if (n->sel.flags&TC_U32_VAROFFSET)
 206                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 207                         off2 &= ~3;
 208                 }
 209                 if (n->sel.flags&TC_U32_EAT) {
 210                         ptr += off2;
 211                         off2 = 0;
 212                 }
 213
 214                 if (ptr < skb->tail)
 215                         goto next_ht;
 216         }
 217
 218         /* POP */
 219         if (sdepth--) {
 220                 n = stack[sdepth].knode;
 221                 ht = n->ht_up;
 222                 ptr = stack[sdepth].ptr;
 223                 goto check_terminal;
 224         }
 225         return -1;
 226
 227 deadloop:
 228         if (net_ratelimit())
 229                 printk("cls_u32: dead loop\n");
 230         return -1;
 231 }
 232
 233 static __inline__ struct tc_u_hnode *
 234 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 235 {
 236         struct tc_u_hnode *ht;
 237
 238         for (ht = tp_c->hlist; ht; ht = ht->next)
 239                 if (ht->handle == handle)
 240                         break;
 241
 242         return ht;
 243 }
 244
 245 static __inline__ struct tc_u_knode *
 246 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 247 {
 248         unsigned sel;
 249         struct tc_u_knode *n = NULL;
 250
 251         sel = TC_U32_HASH(handle);
 252         if (sel > ht->divisor)
 253                 goto out;
 254
 255         for (n = ht->ht[sel]; n; n = n->next)
 256                 if (n->handle == handle)
 257                         break;
 258 out:
 259         return n;
 260 }
 261
 262
 263 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 264 {
 265         struct tc_u_hnode *ht;
 266         struct tc_u_common *tp_c = tp->data;
 267
 268         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 269                 ht = tp->root;
 270         else
 271                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 272
 273         if (!ht)
 274                 return 0;
 275
 276         if (TC_U32_KEY(handle) == 0)
 277                 return (unsigned long)ht;
 278
 279         return (unsigned long)u32_lookup_key(ht, handle);
 280 }
 281
 282 static void u32_put(struct tcf_proto *tp, unsigned long f)
 283 {
 284 }
 285
 286 static u32 gen_new_htid(struct tc_u_common *tp_c)
 287 {
 288         int i = 0x800;
 289
 290         do {
 291                 if (++tp_c->hgenerator == 0x7FF)
 292                         tp_c->hgenerator = 1;
 293         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 294
 295         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 296 }
 297
 298 static int u32_init(struct tcf_proto *tp)
 299 {
 300         struct tc_u_hnode *root_ht;
 301         struct tc_u_common *tp_c;
 302
 303         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 304                 if (tp_c->q == tp->q)
 305                         break;
 306
 307         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 308         if (root_ht == NULL)
 309                 return -ENOBUFS;
 310
 311         memset(root_ht, 0, sizeof(*root_ht));
 312         root_ht->divisor = 0;
 313         root_ht->refcnt++;
 314         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 315
 316         if (tp_c == NULL) {
 317                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 318                 if (tp_c == NULL) {
 319                         kfree(root_ht);
 320                         return -ENOBUFS;
 321                 }
 322                 memset(tp_c, 0, sizeof(*tp_c));
 323                 tp_c->q = tp->q;
 324                 tp_c->next = u32_list;
 325                 u32_list = tp_c;
 326         }
 327
 328         tp_c->refcnt++;
 329         root_ht->next = tp_c->hlist;
 330         tp_c->hlist = root_ht;
 331         root_ht->tp_c = tp_c;
 332
 333         tp->root = root_ht;
 334         tp->data = tp_c;
 335         return 0;
 336 }
 337
 338 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 339 {
 340         tcf_unbind_filter(tp, &n->res);
 341 #ifdef CONFIG_NET_CLS_ACT
 342         if (n->action) {
 343                 tcf_action_destroy(n->action, TCA_ACT_UNBIND);
 344         }
 345 #else
 346 #ifdef CONFIG_NET_CLS_POLICE
 347         tcf_police_release(n->police, TCA_ACT_UNBIND);
 348 #endif
 349 #endif
 350         if (n->ht_down)
 351                 n->ht_down->refcnt--;
 352 #ifdef CONFIG_CLS_U32_PERF
 353         if (n && (NULL != n->pf))
 354                 kfree(n->pf);
 355 #endif
 356         kfree(n);
 357         return 0;
 358 }
 359
 360 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 361 {
 362         struct tc_u_knode **kp;
 363         struct tc_u_hnode *ht = key->ht_up;
 364
 365         if (ht) {
 366                 for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 367                         if (*kp == key) {
 368                                 tcf_tree_lock(tp);
 369                                 *kp = key->next;
 370                                 tcf_tree_unlock(tp);
 371
 372                                 u32_destroy_key(tp, key);
 373                                 return 0;
 374                         }
 375                 }
 376         }
 377         BUG_TRAP(0);
 378         return 0;
 379 }
 380
 381 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 382 {
 383         struct tc_u_knode *n;
 384         unsigned h;
 385
 386         for (h=0; h<=ht->divisor; h++) {
 387                 while ((n = ht->ht[h]) != NULL) {
 388                         ht->ht[h] = n->next;
 389
 390                         u32_destroy_key(tp, n);
 391                 }
 392         }
 393 }
 394
 395 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 396 {
 397         struct tc_u_common *tp_c = tp->data;
 398         struct tc_u_hnode **hn;
 399
 400         BUG_TRAP(!ht->refcnt);
 401
 402         u32_clear_hnode(tp, ht);
 403
 404         for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 405                 if (*hn == ht) {
 406                         *hn = ht->next;
 407                         kfree(ht);
 408                         return 0;
 409                 }
 410         }
 411
 412         BUG_TRAP(0);
 413         return -ENOENT;
 414 }
 415
 416 static void u32_destroy(struct tcf_proto *tp)
 417 {
 418         struct tc_u_common *tp_c = tp->data;
 419         struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 420
 421         BUG_TRAP(root_ht != NULL);
 422
 423         if (root_ht && --root_ht->refcnt == 0)
 424                 u32_destroy_hnode(tp, root_ht);
 425
 426         if (--tp_c->refcnt == 0) {
 427                 struct tc_u_hnode *ht;
 428                 struct tc_u_common **tp_cp;
 429
 430                 for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) {
 431                         if (*tp_cp == tp_c) {
 432                                 *tp_cp = tp_c->next;
 433                                 break;
 434                         }
 435                 }
 436
 437                 for (ht=tp_c->hlist; ht; ht = ht->next)
 438                         u32_clear_hnode(tp, ht);
 439
 440                 while ((ht = tp_c->hlist) != NULL) {
 441                         tp_c->hlist = ht->next;
 442
 443                         BUG_TRAP(ht->refcnt == 0);
 444
 445                         kfree(ht);
 446                 };
 447
 448                 kfree(tp_c);
 449         }
 450
 451         tp->data = NULL;
 452 }
 453
 454 static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 455 {
 456         struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 457
 458         if (ht == NULL)
 459                 return 0;
 460
 461         if (TC_U32_KEY(ht->handle))
 462                 return u32_delete_key(tp, (struct tc_u_knode*)ht);
 463
 464         if (tp->root == ht)
 465                 return -EINVAL;
 466
 467         if (--ht->refcnt == 0)
 468                 u32_destroy_hnode(tp, ht);
 469
 470         return 0;
 471 }
 472
 473 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 474 {
 475         struct tc_u_knode *n;
 476         unsigned i = 0x7FF;
 477
 478         for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 479                 if (i < TC_U32_NODE(n->handle))
 480                         i = TC_U32_NODE(n->handle);
 481         i++;
 482
 483         return handle|(i>0xFFF ? 0xFFF : i);
 484 }
 485
 486 static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 487                          struct tc_u_hnode *ht,
 488                          struct tc_u_knode *n, struct rtattr **tb,
 489                          struct rtattr *est)
 490 {
 491         if (tb[TCA_U32_LINK-1]) {
 492                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 493                 struct tc_u_hnode *ht_down = NULL;
 494
 495                 if (TC_U32_KEY(handle))
 496                         return -EINVAL;
 497
 498                 if (handle) {
 499                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 500
 501                         if (ht_down == NULL)
 502                                 return -EINVAL;
 503                         ht_down->refcnt++;
 504                 }
 505
 506                 tcf_tree_lock(tp);
 507                 ht_down = xchg(&n->ht_down, ht_down);
 508                 tcf_tree_unlock(tp);
 509
 510                 if (ht_down)
 511                         ht_down->refcnt--;
 512         }
 513         if (tb[TCA_U32_CLASSID-1]) {
 514                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 515                 tcf_bind_filter(tp, &n->res, base);
 516         }
 517 #ifdef CONFIG_NET_CLS_ACT
 518         if (tb[TCA_U32_POLICE-1]) {
 519                 int err = tcf_change_act_police(tp, &n->action, tb[TCA_U32_POLICE-1], est);
 520                 if (err < 0)
 521                         return err;
 522         }
 523
 524         if (tb[TCA_U32_ACT-1]) {
 525                 int err = tcf_change_act(tp, &n->action, tb[TCA_U32_ACT-1], est);
 526                 if (err < 0)
 527                         return err;
 528         }
 529 #else
 530 #ifdef CONFIG_NET_CLS_POLICE
 531         if (tb[TCA_U32_POLICE-1]) {
 532                 int err = tcf_change_police(tp, &n->police, tb[TCA_U32_POLICE-1], est);
 533                 if (err < 0)
 534                         return err;
 535         }
 536 #endif
 537 #endif
 538 #ifdef CONFIG_NET_CLS_IND
 539         if (tb[TCA_U32_INDEV-1]) {
 540                 int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]);
 541                 if (err < 0)
 542                         return err;
 543         }
 544 #endif
 545
 546         return 0;
 547 }
 548
 549 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 550                       struct rtattr **tca,
 551                       unsigned long *arg)
 552 {
 553         struct tc_u_common *tp_c = tp->data;
 554         struct tc_u_hnode *ht;
 555         struct tc_u_knode *n;
 556         struct tc_u32_sel *s;
 557         struct rtattr *opt = tca[TCA_OPTIONS-1];
 558         struct rtattr *tb[TCA_U32_MAX];
 559         u32 htid;
 560         int err;
 561
 562         if (opt == NULL)
 563                 return handle ? -EINVAL : 0;
 564
 565         if (rtattr_parse(tb, TCA_U32_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0)
 566                 return -EINVAL;
 567
 568         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 569                 if (TC_U32_KEY(n->handle) == 0)
 570                         return -EINVAL;
 571
 572                 return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 573         }
 574
 575         if (tb[TCA_U32_DIVISOR-1]) {
 576                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 577
 578                 if (--divisor > 0x100)
 579                         return -EINVAL;
 580                 if (TC_U32_KEY(handle))
 581                         return -EINVAL;
 582                 if (handle == 0) {
 583                         handle = gen_new_htid(tp->data);
 584                         if (handle == 0)
 585                                 return -ENOMEM;
 586                 }
 587                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 588                 if (ht == NULL)
 589                         return -ENOBUFS;
 590                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 591                 ht->tp_c = tp_c;
 592                 ht->refcnt = 0;
 593                 ht->divisor = divisor;
 594                 ht->handle = handle;
 595                 ht->next = tp_c->hlist;
 596                 tp_c->hlist = ht;
 597                 *arg = (unsigned long)ht;
 598                 return 0;
 599         }
 600
 601         if (tb[TCA_U32_HASH-1]) {
 602                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 603                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 604                         ht = tp->root;
 605                         htid = ht->handle;
 606                 } else {
 607                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 608                         if (ht == NULL)
 609                                 return -EINVAL;
 610                 }
 611         } else {
 612                 ht = tp->root;
 613                 htid = ht->handle;
 614         }
 615
 616         if (ht->divisor < TC_U32_HASH(htid))
 617                 return -EINVAL;
 618
 619         if (handle) {
 620                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 621                         return -EINVAL;
 622                 handle = htid | TC_U32_NODE(handle);
 623         } else
 624                 handle = gen_new_kid(ht, htid);
 625
 626         if (tb[TCA_U32_SEL-1] == 0 ||
 627             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 628                 return -EINVAL;
 629
 630         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 631
 632         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 633         if (n == NULL)
 634                 return -ENOBUFS;
 635
 636         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 637 #ifdef CONFIG_CLS_U32_PERF
 638         n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(__u64), GFP_KERNEL);
 639         if (n->pf == NULL) {
 640                 kfree(n);
 641                 return -ENOBUFS;
 642         }
 643         memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(__u64));
 644 #endif
 645
 646         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 647         n->ht_up = ht;
 648         n->handle = handle;
 649 {
 650         u8 i = 0;
 651         u32 mask = s->hmask;
 652         if (mask) {
 653                 while (!(mask & 1)) {
 654                         i++;
 655                         mask>>=1;
 656                 }
 657         }
 658         n->fshift = i;
 659 }
 660         err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]);
 661         if (err == 0) {
 662                 struct tc_u_knode **ins;
 663                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 664                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 665                                 break;
 666
 667                 n->next = *ins;
 668                 wmb();
 669                 *ins = n;
 670
 671                 *arg = (unsigned long)n;
 672                 return 0;
 673         }
 674 #ifdef CONFIG_CLS_U32_PERF
 675         if (n && (NULL != n->pf))
 676                 kfree(n->pf);
 677 #endif
 678         kfree(n);
 679         return err;
 680 }
 681
 682 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 683 {
 684         struct tc_u_common *tp_c = tp->data;
 685         struct tc_u_hnode *ht;
 686         struct tc_u_knode *n;
 687         unsigned h;
 688
 689         if (arg->stop)
 690                 return;
 691
 692         for (ht = tp_c->hlist; ht; ht = ht->next) {
 693                 if (arg->count >= arg->skip) {
 694                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 695                                 arg->stop = 1;
 696                                 return;
 697                         }
 698                 }
 699                 arg->count++;
 700                 for (h = 0; h <= ht->divisor; h++) {
 701                         for (n = ht->ht[h]; n; n = n->next) {
 702                                 if (arg->count < arg->skip) {
 703                                         arg->count++;
 704                                         continue;
 705                                 }
 706                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 707                                         arg->stop = 1;
 708                                         return;
 709                                 }
 710                                 arg->count++;
 711                         }
 712                 }
 713         }
 714 }
 715
 716 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 717                      struct sk_buff *skb, struct tcmsg *t)
 718 {
 719         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 720         unsigned char    *b = skb->tail;
 721         struct rtattr *rta;
 722
 723         if (n == NULL)
 724                 return skb->len;
 725
 726         t->tcm_handle = n->handle;
 727
 728         rta = (struct rtattr*)b;
 729         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 730
 731         if (TC_U32_KEY(n->handle) == 0) {
 732                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 733                 u32 divisor = ht->divisor+1;
 734                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 735         } else {
 736                 RTA_PUT(skb, TCA_U32_SEL,
 737                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 738                         &n->sel);
 739                 if (n->ht_up) {
 740                         u32 htid = n->handle & 0xFFFFF000;
 741                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 742                 }
 743                 if (n->res.classid)
 744                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 745                 if (n->ht_down)
 746                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 747 #ifdef CONFIG_NET_CLS_ACT
 748                 if (tcf_dump_act(skb, n->action, TCA_U32_ACT, TCA_U32_POLICE) < 0)
 749                         goto rtattr_failure;
 750 #else
 751 #ifdef CONFIG_NET_CLS_POLICE
 752                 if (tcf_dump_police(skb, n->police, TCA_U32_POLICE) < 0)
 753                         goto rtattr_failure;
 754 #endif
 755 #endif
 756
 757 #ifdef CONFIG_NET_CLS_IND
 758                 if(strlen(n->indev))
 759                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 760 #endif
 761 #ifdef CONFIG_CLS_U32_PERF
 762                 RTA_PUT(skb, TCA_U32_PCNT,
 763                 sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(__u64),
 764                         n->pf);
 765 #endif
 766         }
 767
 768         rta->rta_len = skb->tail - b;
 769 #ifdef CONFIG_NET_CLS_ACT
 770         if (TC_U32_KEY(n->handle) != 0) {
 771                 if (TC_U32_KEY(n->handle) && n->action && n->action->type == TCA_OLD_COMPAT) {
 772                         if (tcf_action_copy_stats(skb,n->action))
 773                                 goto rtattr_failure;
 774                 }
 775         }
 776 #else
 777 #ifdef CONFIG_NET_CLS_POLICE
 778         if (TC_U32_KEY(n->handle) && n->police)
 779                 if (tcf_police_dump_stats(skb, n->police) < 0)
 780                         goto rtattr_failure;
 781 #endif
 782 #endif
 783         return skb->len;
 784
 785 rtattr_failure:
 786         skb_trim(skb, b - skb->data);
 787         return -1;
 788 }
 789
 790 static struct tcf_proto_ops cls_u32_ops = {
 791         .next           =       NULL,
 792         .kind           =       "u32",
 793         .classify       =       u32_classify,
 794         .init           =       u32_init,
 795         .destroy        =       u32_destroy,
 796         .get            =       u32_get,
 797         .put            =       u32_put,
 798         .change         =       u32_change,
 799         .delete         =       u32_delete,
 800         .walk           =       u32_walk,
 801         .dump           =       u32_dump,
 802         .owner          =       THIS_MODULE,
 803 };
 804
 805 static int __init init_u32(void)
 806 {
 807         printk("u32 classifier\n");
 808 #ifdef CONFIG_CLS_U32_PERF
 809         printk("    Perfomance counters on\n");
 810 #endif
 811 #ifdef CONFIG_NET_CLS_POLICE
 812         printk("    OLD policer on \n");
 813 #endif
 814 #ifdef CONFIG_NET_CLS_IND
 815         printk("    input device check on \n");
 816 #endif
 817 #ifdef CONFIG_NET_CLS_ACT
 818         printk("    Actions configured \n");
 819 #endif
 820         return register_tcf_proto_ops(&cls_u32_ops);
 821 }
 822
 823 static void __exit exit_u32(void)
 824 {
 825         unregister_tcf_proto_ops(&cls_u32_ops);
 826 }
 827
 828 module_init(init_u32)
 829 module_exit(exit_u32)
 830 MODULE_LICENSE("GPL");