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 <asm/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/pkt_sched.h>
  58
  59
  60 struct tc_u_knode
  61 {
  62         struct tc_u_knode       *next;
  63         u32                     handle;
  64         struct tc_u_hnode       *ht_up;
  65 #ifdef CONFIG_NET_CLS_ACT
  66         struct tc_action        *action;
  67 #ifdef CONFIG_NET_CLS_IND
  68         char                     indev[IFNAMSIZ];
  69 #endif
  70 #else
  71 #ifdef CONFIG_NET_CLS_POLICE
  72         struct tcf_police       *police;
  73 #endif
  74 #endif
  75         u8                      fshift;
  76         struct tcf_result       res;
  77         struct tc_u_hnode       *ht_down;
  78         struct tc_u32_sel       sel;
  79 };
  80
  81 struct tc_u_hnode
  82 {
  83         struct tc_u_hnode       *next;
  84         u32                     handle;
  85         struct tc_u_common      *tp_c;
  86         int                     refcnt;
  87         unsigned                divisor;
  88         u32                     hgenerator;
  89         struct tc_u_knode       *ht[1];
  90 };
  91
  92 struct tc_u_common
  93 {
  94         struct tc_u_common      *next;
  95         struct tc_u_hnode       *hlist;
  96         struct Qdisc            *q;
  97         int                     refcnt;
  98         u32                     hgenerator;
  99 };
 100
 101 static struct tc_u_common *u32_list;
 102
 103 static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift)
 104 {
 105         unsigned h = (key & sel->hmask)>>fshift;
 106
 107         return h;
 108 }
 109
 110 static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
 111 {
 112         struct {
 113                 struct tc_u_knode *knode;
 114                 u8                *ptr;
 115         } stack[TC_U32_MAXDEPTH];
 116
 117         struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 118         u8 *ptr = skb->nh.raw;
 119         struct tc_u_knode *n;
 120         int sdepth = 0;
 121         int off2 = 0;
 122         int sel = 0;
 123         int i;
 124
 125 next_ht:
 126         n = ht->ht[sel];
 127
 128 next_knode:
 129         if (n) {
 130                 struct tc_u32_key *key = n->sel.keys;
 131
 132 #ifdef CONFIG_CLS_U32_PERF
 133                 n->sel.rcnt +=1;
 134 #endif
 135                 for (i = n->sel.nkeys; i>0; i--, key++) {
 136
 137                         if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) {
 138                                 n = n->next;
 139                                 goto next_knode;
 140                         }
 141 #ifdef CONFIG_CLS_U32_PERF
 142                         key->kcnt +=1;
 143 #endif
 144                 }
 145                 if (n->ht_down == NULL) {
 146 check_terminal:
 147                         if (n->sel.flags&TC_U32_TERMINAL) {
 148
 149                                 *res = n->res;
 150 #ifdef CONFIG_NET_CLS_ACT
 151 #ifdef CONFIG_NET_CLS_IND
 152                                 /* yes, i know it sucks but the feature is
 153                                 ** optional dammit! - JHS */
 154                                 if (0 != n->indev[0]) {
 155                                         if  (NULL == skb->input_dev) {
 156                                                 n = n->next;
 157                                                 goto next_knode;
 158                                         } else {
 159                                                 if (0 != strcmp(n->indev, skb->input_dev->name)) {
 160                                                         n = n->next;
 161                                                         goto next_knode;
 162                                                 }
 163                                         }
 164                                 }
 165 #endif
 166 #ifdef CONFIG_CLS_U32_PERF
 167                 n->sel.rhit +=1;
 168 #endif
 169                                 if (n->action) {
 170                                         int pol_res = tcf_action_exec(skb, n->action);
 171                                         if (skb->tc_classid > 0) {
 172                                                 res->classid = skb->tc_classid;
 173                                                 skb->tc_classid = 0;
 174                                         }
 175
 176                                         if (pol_res >= 0)
 177                                                 return pol_res;
 178                                 } else
 179 #else
 180 #ifdef CONFIG_NET_CLS_POLICE
 181                                 if (n->police) {
 182                                         int pol_res = tcf_police(skb, n->police);
 183                                         if (pol_res >= 0)
 184                                                 return pol_res;
 185                                 } else
 186 #endif
 187 #endif
 188                                         return 0;
 189                         }
 190                         n = n->next;
 191                         goto next_knode;
 192                 }
 193
 194                 /* PUSH */
 195                 if (sdepth >= TC_U32_MAXDEPTH)
 196                         goto deadloop;
 197                 stack[sdepth].knode = n;
 198                 stack[sdepth].ptr = ptr;
 199                 sdepth++;
 200
 201                 ht = n->ht_down;
 202                 sel = 0;
 203                 if (ht->divisor)
 204                         sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 205
 206                 if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 207                         goto next_ht;
 208
 209                 if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 210                         off2 = n->sel.off + 3;
 211                         if (n->sel.flags&TC_U32_VAROFFSET)
 212                                 off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 213                         off2 &= ~3;
 214                 }
 215                 if (n->sel.flags&TC_U32_EAT) {
 216                         ptr += off2;
 217                         off2 = 0;
 218                 }
 219
 220                 if (ptr < skb->tail)
 221                         goto next_ht;
 222         }
 223
 224         /* POP */
 225         if (sdepth--) {
 226                 n = stack[sdepth].knode;
 227                 ht = n->ht_up;
 228                 ptr = stack[sdepth].ptr;
 229                 goto check_terminal;
 230         }
 231         return -1;
 232
 233 deadloop:
 234         if (net_ratelimit())
 235                 printk("cls_u32: dead loop\n");
 236         return -1;
 237 }
 238
 239 static __inline__ struct tc_u_hnode *
 240 u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 241 {
 242         struct tc_u_hnode *ht;
 243
 244         for (ht = tp_c->hlist; ht; ht = ht->next)
 245                 if (ht->handle == handle)
 246                         break;
 247
 248         return ht;
 249 }
 250
 251 static __inline__ struct tc_u_knode *
 252 u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 253 {
 254         unsigned sel;
 255         struct tc_u_knode *n = NULL;
 256
 257         sel = TC_U32_HASH(handle);
 258         if (sel > ht->divisor)
 259                 goto out;
 260
 261         for (n = ht->ht[sel]; n; n = n->next)
 262                 if (n->handle == handle)
 263                         break;
 264 out:
 265         return n;
 266 }
 267
 268
 269 static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 270 {
 271         struct tc_u_hnode *ht;
 272         struct tc_u_common *tp_c = tp->data;
 273
 274         if (TC_U32_HTID(handle) == TC_U32_ROOT)
 275                 ht = tp->root;
 276         else
 277                 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 278
 279         if (!ht)
 280                 return 0;
 281
 282         if (TC_U32_KEY(handle) == 0)
 283                 return (unsigned long)ht;
 284
 285         return (unsigned long)u32_lookup_key(ht, handle);
 286 }
 287
 288 static void u32_put(struct tcf_proto *tp, unsigned long f)
 289 {
 290 }
 291
 292 static u32 gen_new_htid(struct tc_u_common *tp_c)
 293 {
 294         int i = 0x800;
 295
 296         do {
 297                 if (++tp_c->hgenerator == 0x7FF)
 298                         tp_c->hgenerator = 1;
 299         } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 300
 301         return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 302 }
 303
 304 static int u32_init(struct tcf_proto *tp)
 305 {
 306         struct tc_u_hnode *root_ht;
 307         struct tc_u_common *tp_c;
 308
 309         for (tp_c = u32_list; tp_c; tp_c = tp_c->next)
 310                 if (tp_c->q == tp->q)
 311                         break;
 312
 313         root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL);
 314         if (root_ht == NULL)
 315                 return -ENOBUFS;
 316
 317         memset(root_ht, 0, sizeof(*root_ht));
 318         root_ht->divisor = 0;
 319         root_ht->refcnt++;
 320         root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 321
 322         if (tp_c == NULL) {
 323                 tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL);
 324                 if (tp_c == NULL) {
 325                         kfree(root_ht);
 326                         return -ENOBUFS;
 327                 }
 328                 memset(tp_c, 0, sizeof(*tp_c));
 329                 tp_c->q = tp->q;
 330                 tp_c->next = u32_list;
 331                 u32_list = tp_c;
 332         }
 333
 334         tp_c->refcnt++;
 335         root_ht->next = tp_c->hlist;
 336         tp_c->hlist = root_ht;
 337         root_ht->tp_c = tp_c;
 338
 339         tp->root = root_ht;
 340         tp->data = tp_c;
 341         return 0;
 342 }
 343
 344 static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 345 {
 346         unsigned long cl;
 347
 348         if ((cl = __cls_set_class(&n->res.class, 0)) != 0)
 349                 tp->q->ops->cl_ops->unbind_tcf(tp->q, cl);
 350 #ifdef CONFIG_NET_CLS_ACT
 351         if (n->action) {
 352                 tcf_action_destroy(n->action, TCA_ACT_UNBIND);
 353         }
 354 #else
 355 #ifdef CONFIG_NET_CLS_POLICE
 356         tcf_police_release(n->police, TCA_ACT_UNBIND);
 357 #endif
 358 #endif
 359         if (n->ht_down)
 360                 n->ht_down->refcnt--;
 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 Qdisc *q, unsigned long base,
 492                          struct tc_u_hnode *ht,
 493                          struct tc_u_knode *n, struct rtattr **tb,
 494                          struct rtattr *est)
 495 {
 496 #ifdef CONFIG_NET_CLS_ACT
 497         struct tc_action *act = NULL;
 498         int ret;
 499 #endif
 500         if (tb[TCA_U32_LINK-1]) {
 501                 u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]);
 502                 struct tc_u_hnode *ht_down = NULL;
 503
 504                 if (TC_U32_KEY(handle))
 505                         return -EINVAL;
 506
 507                 if (handle) {
 508                         ht_down = u32_lookup_ht(ht->tp_c, handle);
 509
 510                         if (ht_down == NULL)
 511                                 return -EINVAL;
 512                         ht_down->refcnt++;
 513                 }
 514
 515                 sch_tree_lock(q);
 516                 ht_down = xchg(&n->ht_down, ht_down);
 517                 sch_tree_unlock(q);
 518
 519                 if (ht_down)
 520                         ht_down->refcnt--;
 521         }
 522         if (tb[TCA_U32_CLASSID-1]) {
 523                 unsigned long cl;
 524
 525                 n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]);
 526                 sch_tree_lock(q);
 527                 cl = __cls_set_class(&n->res.class, q->ops->cl_ops->bind_tcf(q, base, n->res.classid));
 528                 sch_tree_unlock(q);
 529                 if (cl)
 530                         q->ops->cl_ops->unbind_tcf(q, cl);
 531         }
 532 #ifdef CONFIG_NET_CLS_ACT
 533         /*backward compatibility */
 534         if (tb[TCA_U32_POLICE-1])
 535         {
 536                 act = kmalloc(sizeof(*act),GFP_KERNEL);
 537                 if (NULL == act)
 538                         return -ENOMEM;
 539
 540                 memset(act,0,sizeof(*act));
 541                 ret = tcf_action_init_1(tb[TCA_U32_POLICE-1], est,act,"police", TCA_ACT_NOREPLACE, TCA_ACT_BIND);
 542                 if (0 > ret){
 543                         tcf_action_destroy(act, TCA_ACT_UNBIND);
 544                         return ret;
 545                 }
 546                 act->type = TCA_OLD_COMPAT;
 547
 548                 sch_tree_lock(q);
 549                 act = xchg(&n->action, act);
 550                 sch_tree_unlock(q);
 551
 552                 tcf_action_destroy(act, TCA_ACT_UNBIND);
 553
 554         }
 555
 556         if(tb[TCA_U32_ACT-1]) {
 557                 act = kmalloc(sizeof(*act),GFP_KERNEL);
 558                 if (NULL == act)
 559                         return -ENOMEM;
 560                 memset(act,0,sizeof(*act));
 561                 ret = tcf_action_init(tb[TCA_U32_ACT-1], est,act,NULL,TCA_ACT_NOREPLACE, TCA_ACT_BIND);
 562                 if (0 > ret) {
 563                         tcf_action_destroy(act, TCA_ACT_UNBIND);
 564                         return ret;
 565                 }
 566
 567                 sch_tree_lock(q);
 568                 act = xchg(&n->action, act);
 569                 sch_tree_unlock(q);
 570
 571                 tcf_action_destroy(act, TCA_ACT_UNBIND);
 572         }
 573
 574 #ifdef CONFIG_NET_CLS_IND
 575         n->indev[0] = 0;
 576         if(tb[TCA_U32_INDEV-1]) {
 577                 struct rtattr *input_dev = tb[TCA_U32_INDEV-1];
 578                 if (RTA_PAYLOAD(input_dev) >= IFNAMSIZ) {
 579                         printk("cls_u32: bad indev name %s\n",(char*)RTA_DATA(input_dev));
 580                         /* should we clear state first? */
 581                         return  -EINVAL;
 582                 }
 583                 sprintf(n->indev, "%s", (char*)RTA_DATA(input_dev));
 584         }
 585 #endif
 586
 587 #else
 588 #ifdef CONFIG_NET_CLS_POLICE
 589         if (tb[TCA_U32_POLICE-1]) {
 590                 struct tcf_police *police = tcf_police_locate(tb[TCA_U32_POLICE-1], est);
 591                 sch_tree_lock(q);
 592                 police = xchg(&n->police, police);
 593                 sch_tree_unlock(q);
 594                 tcf_police_release(police, TCA_ACT_UNBIND);
 595         }
 596 #endif
 597 #endif
 598
 599         return 0;
 600 }
 601
 602 static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 603                       struct rtattr **tca,
 604                       unsigned long *arg)
 605 {
 606         struct tc_u_common *tp_c = tp->data;
 607         struct tc_u_hnode *ht;
 608         struct tc_u_knode *n;
 609         struct tc_u32_sel *s;
 610         struct rtattr *opt = tca[TCA_OPTIONS-1];
 611         struct rtattr *tb[TCA_U32_MAX];
 612         u32 htid;
 613         int err;
 614
 615         if (opt == NULL)
 616                 return handle ? -EINVAL : 0;
 617
 618         if (rtattr_parse(tb, TCA_U32_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0)
 619                 return -EINVAL;
 620
 621         if ((n = (struct tc_u_knode*)*arg) != NULL) {
 622                 if (TC_U32_KEY(n->handle) == 0)
 623                         return -EINVAL;
 624
 625                 return u32_set_parms(tp->q, base, n->ht_up, n, tb, tca[TCA_RATE-1]);
 626         }
 627
 628         if (tb[TCA_U32_DIVISOR-1]) {
 629                 unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]);
 630
 631                 if (--divisor > 0x100)
 632                         return -EINVAL;
 633                 if (TC_U32_KEY(handle))
 634                         return -EINVAL;
 635                 if (handle == 0) {
 636                         handle = gen_new_htid(tp->data);
 637                         if (handle == 0)
 638                                 return -ENOMEM;
 639                 }
 640                 ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 641                 if (ht == NULL)
 642                         return -ENOBUFS;
 643                 memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*));
 644                 ht->tp_c = tp_c;
 645                 ht->refcnt = 0;
 646                 ht->divisor = divisor;
 647                 ht->handle = handle;
 648                 ht->next = tp_c->hlist;
 649                 tp_c->hlist = ht;
 650                 *arg = (unsigned long)ht;
 651                 return 0;
 652         }
 653
 654         if (tb[TCA_U32_HASH-1]) {
 655                 htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]);
 656                 if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 657                         ht = tp->root;
 658                         htid = ht->handle;
 659                 } else {
 660                         ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 661                         if (ht == NULL)
 662                                 return -EINVAL;
 663                 }
 664         } else {
 665                 ht = tp->root;
 666                 htid = ht->handle;
 667         }
 668
 669         if (ht->divisor < TC_U32_HASH(htid))
 670                 return -EINVAL;
 671
 672         if (handle) {
 673                 if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 674                         return -EINVAL;
 675                 handle = htid | TC_U32_NODE(handle);
 676         } else
 677                 handle = gen_new_kid(ht, htid);
 678
 679         if (tb[TCA_U32_SEL-1] == 0 ||
 680             RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel))
 681                 return -EINVAL;
 682
 683         s = RTA_DATA(tb[TCA_U32_SEL-1]);
 684
 685 #ifdef CONFIG_CLS_U32_PERF
 686         if (RTA_PAYLOAD(tb[TCA_U32_SEL-1]) <
 687                 (s->nkeys*sizeof(struct tc_u32_key)) + sizeof(struct tc_u32_sel)) {
 688                         printk("Please upgrade your iproute2 tools or compile proper options in!\n");
 689                         return -EINVAL;
 690 }
 691 #endif
 692         n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 693         if (n == NULL)
 694                 return -ENOBUFS;
 695         memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key));
 696         memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 697         n->ht_up = ht;
 698         n->handle = handle;
 699 {
 700         u8 i = 0;
 701         u32 mask = s->hmask;
 702         if (mask) {
 703                 while (!(mask & 1)) {
 704                         i++;
 705                         mask>>=1;
 706                 }
 707         }
 708         n->fshift = i;
 709 }
 710         err = u32_set_parms(tp->q, base, ht, n, tb, tca[TCA_RATE-1]);
 711         if (err == 0) {
 712                 struct tc_u_knode **ins;
 713                 for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 714                         if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 715                                 break;
 716
 717                 n->next = *ins;
 718                 wmb();
 719                 *ins = n;
 720
 721                 *arg = (unsigned long)n;
 722                 return 0;
 723         }
 724         kfree(n);
 725         return err;
 726 }
 727
 728 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 729 {
 730         struct tc_u_common *tp_c = tp->data;
 731         struct tc_u_hnode *ht;
 732         struct tc_u_knode *n;
 733         unsigned h;
 734
 735         if (arg->stop)
 736                 return;
 737
 738         for (ht = tp_c->hlist; ht; ht = ht->next) {
 739                 if (arg->count >= arg->skip) {
 740                         if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 741                                 arg->stop = 1;
 742                                 return;
 743                         }
 744                 }
 745                 arg->count++;
 746                 for (h = 0; h <= ht->divisor; h++) {
 747                         for (n = ht->ht[h]; n; n = n->next) {
 748                                 if (arg->count < arg->skip) {
 749                                         arg->count++;
 750                                         continue;
 751                                 }
 752                                 if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 753                                         arg->stop = 1;
 754                                         return;
 755                                 }
 756                                 arg->count++;
 757                         }
 758                 }
 759         }
 760 }
 761
 762 static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 763                      struct sk_buff *skb, struct tcmsg *t)
 764 {
 765         struct tc_u_knode *n = (struct tc_u_knode*)fh;
 766         unsigned char    *b = skb->tail;
 767         struct rtattr *rta;
 768
 769         if (n == NULL)
 770                 return skb->len;
 771
 772         t->tcm_handle = n->handle;
 773
 774         rta = (struct rtattr*)b;
 775         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 776
 777         if (TC_U32_KEY(n->handle) == 0) {
 778                 struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 779                 u32 divisor = ht->divisor+1;
 780                 RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor);
 781         } else {
 782                 RTA_PUT(skb, TCA_U32_SEL,
 783                         sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 784                         &n->sel);
 785                 if (n->ht_up) {
 786                         u32 htid = n->handle & 0xFFFFF000;
 787                         RTA_PUT(skb, TCA_U32_HASH, 4, &htid);
 788                 }
 789                 if (n->res.classid)
 790                         RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid);
 791                 if (n->ht_down)
 792                         RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle);
 793 #ifdef CONFIG_NET_CLS_ACT
 794                 /* again for backward compatible mode - we want
 795                 *  to work with both old and new modes of entering
 796                 *  tc data even if iproute2  was newer - jhs
 797                 */
 798                 if (n->action) {
 799                         struct rtattr * p_rta = (struct rtattr*)skb->tail;
 800
 801                         if (n->action->type != TCA_OLD_COMPAT) {
 802                                 RTA_PUT(skb, TCA_U32_ACT, 0, NULL);
 803                                 if (tcf_action_dump(skb,n->action, 0, 0) < 0) {
 804                                         goto rtattr_failure;
 805                                 }
 806                         } else {
 807                                 RTA_PUT(skb, TCA_U32_POLICE, 0, NULL);
 808                                 if (tcf_action_dump_old(skb,n->action,0,0) < 0) {
 809                                         goto rtattr_failure;
 810                                 }
 811                         }
 812
 813                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 814                 }
 815 #ifdef CONFIG_NET_CLS_IND
 816                 if(strlen(n->indev)) {
 817                         struct rtattr * p_rta = (struct rtattr*)skb->tail;
 818                         RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev);
 819                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 820                 }
 821 #endif
 822
 823 #else
 824 #ifdef CONFIG_NET_CLS_POLICE
 825                 if (n->police) {
 826                         struct rtattr * p_rta = (struct rtattr*)skb->tail;
 827                         RTA_PUT(skb, TCA_U32_POLICE, 0, NULL);
 828
 829                         if (tcf_police_dump(skb, n->police) < 0)
 830                                 goto rtattr_failure;
 831
 832                         p_rta->rta_len = skb->tail - (u8*)p_rta;
 833
 834                 }
 835 #endif
 836 #endif
 837         }
 838
 839         rta->rta_len = skb->tail - b;
 840 #ifdef CONFIG_NET_CLS_ACT
 841         if (TC_U32_KEY(n->handle) && n->action && n->action->type == TCA_OLD_COMPAT) {
 842                 if (tcf_action_copy_stats(skb,n->action))
 843                         goto rtattr_failure;
 844         }
 845 #else
 846 #ifdef CONFIG_NET_CLS_POLICE
 847         if (TC_U32_KEY(n->handle) && n->police) {
 848                 if (qdisc_copy_stats(skb, &n->police->stats,
 849                                      n->police->stats_lock))
 850                         goto rtattr_failure;
 851         }
 852 #endif
 853 #endif
 854         return skb->len;
 855
 856 rtattr_failure:
 857         skb_trim(skb, b - skb->data);
 858         return -1;
 859 }
 860
 861 static struct tcf_proto_ops cls_u32_ops = {
 862         .next           =       NULL,
 863         .kind           =       "u32",
 864         .classify       =       u32_classify,
 865         .init           =       u32_init,
 866         .destroy        =       u32_destroy,
 867         .get            =       u32_get,
 868         .put            =       u32_put,
 869         .change         =       u32_change,
 870         .delete         =       u32_delete,
 871         .walk           =       u32_walk,
 872         .dump           =       u32_dump,
 873         .owner          =       THIS_MODULE,
 874 };
 875
 876 static int __init init_u32(void)
 877 {
 878         return register_tcf_proto_ops(&cls_u32_ops);
 879 }
 880
 881 static void __exit exit_u32(void)
 882 {
 883         unregister_tcf_proto_ops(&cls_u32_ops);
 884 }
 885
 886 module_init(init_u32)
 887 module_exit(exit_u32)
 888 MODULE_LICENSE("GPL");