linux/net/sched/cls_u32.c
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   1/*
   2 * net/sched/cls_u32.c  Ugly (or Universal) 32bit key Packet Classifier.
   3 *
   4 *              This program is free software; you can redistribute it and/or
   5 *              modify it under the terms of the GNU General Public License
   6 *              as published by the Free Software Foundation; either version
   7 *              2 of the License, or (at your option) any later version.
   8 *
   9 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10 *
  11 *      The filters are packed to hash tables of key nodes
  12 *      with a set of 32bit key/mask pairs at every node.
  13 *      Nodes reference next level hash tables etc.
  14 *
  15 *      This scheme is the best universal classifier I managed to
  16 *      invent; it is not super-fast, but it is not slow (provided you
  17 *      program it correctly), and general enough.  And its relative
  18 *      speed grows as the number of rules becomes larger.
  19 *
  20 *      It seems that it represents the best middle point between
  21 *      speed and manageability both by human and by machine.
  22 *
  23 *      It is especially useful for link sharing combined with QoS;
  24 *      pure RSVP doesn't need such a general approach and can use
  25 *      much simpler (and faster) schemes, sort of cls_rsvp.c.
  26 *
  27 *      JHS: We should remove the CONFIG_NET_CLS_IND from here
  28 *      eventually when the meta match extension is made available
  29 *
  30 *      nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
  31 */
  32
  33#include <linux/module.h>
  34#include <linux/types.h>
  35#include <linux/kernel.h>
  36#include <linux/string.h>
  37#include <linux/errno.h>
  38#include <linux/rtnetlink.h>
  39#include <linux/skbuff.h>
  40#include <net/netlink.h>
  41#include <net/act_api.h>
  42#include <net/pkt_cls.h>
  43
  44struct tc_u_knode
  45{
  46        struct tc_u_knode       *next;
  47        u32                     handle;
  48        struct tc_u_hnode       *ht_up;
  49        struct tcf_exts         exts;
  50#ifdef CONFIG_NET_CLS_IND
  51        char                     indev[IFNAMSIZ];
  52#endif
  53        u8                      fshift;
  54        struct tcf_result       res;
  55        struct tc_u_hnode       *ht_down;
  56#ifdef CONFIG_CLS_U32_PERF
  57        struct tc_u32_pcnt      *pf;
  58#endif
  59#ifdef CONFIG_CLS_U32_MARK
  60        struct tc_u32_mark      mark;
  61#endif
  62        struct tc_u32_sel       sel;
  63};
  64
  65struct tc_u_hnode
  66{
  67        struct tc_u_hnode       *next;
  68        u32                     handle;
  69        u32                     prio;
  70        struct tc_u_common      *tp_c;
  71        int                     refcnt;
  72        unsigned                divisor;
  73        struct tc_u_knode       *ht[1];
  74};
  75
  76struct tc_u_common
  77{
  78        struct tc_u_hnode       *hlist;
  79        struct Qdisc            *q;
  80        int                     refcnt;
  81        u32                     hgenerator;
  82};
  83
  84static const struct tcf_ext_map u32_ext_map = {
  85        .action = TCA_U32_ACT,
  86        .police = TCA_U32_POLICE
  87};
  88
  89static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift)
  90{
  91        unsigned h = ntohl(key & sel->hmask)>>fshift;
  92
  93        return h;
  94}
  95
  96static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res)
  97{
  98        struct {
  99                struct tc_u_knode *knode;
 100                u8                *ptr;
 101        } stack[TC_U32_MAXDEPTH];
 102
 103        struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root;
 104        u8 *ptr = skb_network_header(skb);
 105        struct tc_u_knode *n;
 106        int sdepth = 0;
 107        int off2 = 0;
 108        int sel = 0;
 109#ifdef CONFIG_CLS_U32_PERF
 110        int j;
 111#endif
 112        int i, r;
 113
 114next_ht:
 115        n = ht->ht[sel];
 116
 117next_knode:
 118        if (n) {
 119                struct tc_u32_key *key = n->sel.keys;
 120
 121#ifdef CONFIG_CLS_U32_PERF
 122                n->pf->rcnt +=1;
 123                j = 0;
 124#endif
 125
 126#ifdef CONFIG_CLS_U32_MARK
 127                if ((skb->mark & n->mark.mask) != n->mark.val) {
 128                        n = n->next;
 129                        goto next_knode;
 130                } else {
 131                        n->mark.success++;
 132                }
 133#endif
 134
 135                for (i = n->sel.nkeys; i>0; i--, key++) {
 136
 137                        if ((*(__be32*)(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                        n->pf->kcnts[j] +=1;
 143                        j++;
 144#endif
 145                }
 146                if (n->ht_down == NULL) {
 147check_terminal:
 148                        if (n->sel.flags&TC_U32_TERMINAL) {
 149
 150                                *res = n->res;
 151#ifdef CONFIG_NET_CLS_IND
 152                                if (!tcf_match_indev(skb, n->indev)) {
 153                                        n = n->next;
 154                                        goto next_knode;
 155                                }
 156#endif
 157#ifdef CONFIG_CLS_U32_PERF
 158                                n->pf->rhit +=1;
 159#endif
 160                                r = tcf_exts_exec(skb, &n->exts, res);
 161                                if (r < 0) {
 162                                        n = n->next;
 163                                        goto next_knode;
 164                                }
 165
 166                                return r;
 167                        }
 168                        n = n->next;
 169                        goto next_knode;
 170                }
 171
 172                /* PUSH */
 173                if (sdepth >= TC_U32_MAXDEPTH)
 174                        goto deadloop;
 175                stack[sdepth].knode = n;
 176                stack[sdepth].ptr = ptr;
 177                sdepth++;
 178
 179                ht = n->ht_down;
 180                sel = 0;
 181                if (ht->divisor)
 182                        sel = ht->divisor&u32_hash_fold(*(__be32*)(ptr+n->sel.hoff), &n->sel,n->fshift);
 183
 184                if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT)))
 185                        goto next_ht;
 186
 187                if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) {
 188                        off2 = n->sel.off + 3;
 189                        if (n->sel.flags&TC_U32_VAROFFSET)
 190                                off2 += ntohs(n->sel.offmask & *(__be16*)(ptr+n->sel.offoff)) >>n->sel.offshift;
 191                        off2 &= ~3;
 192                }
 193                if (n->sel.flags&TC_U32_EAT) {
 194                        ptr += off2;
 195                        off2 = 0;
 196                }
 197
 198                if (ptr < skb_tail_pointer(skb))
 199                        goto next_ht;
 200        }
 201
 202        /* POP */
 203        if (sdepth--) {
 204                n = stack[sdepth].knode;
 205                ht = n->ht_up;
 206                ptr = stack[sdepth].ptr;
 207                goto check_terminal;
 208        }
 209        return -1;
 210
 211deadloop:
 212        if (net_ratelimit())
 213                printk("cls_u32: dead loop\n");
 214        return -1;
 215}
 216
 217static __inline__ struct tc_u_hnode *
 218u32_lookup_ht(struct tc_u_common *tp_c, u32 handle)
 219{
 220        struct tc_u_hnode *ht;
 221
 222        for (ht = tp_c->hlist; ht; ht = ht->next)
 223                if (ht->handle == handle)
 224                        break;
 225
 226        return ht;
 227}
 228
 229static __inline__ struct tc_u_knode *
 230u32_lookup_key(struct tc_u_hnode *ht, u32 handle)
 231{
 232        unsigned sel;
 233        struct tc_u_knode *n = NULL;
 234
 235        sel = TC_U32_HASH(handle);
 236        if (sel > ht->divisor)
 237                goto out;
 238
 239        for (n = ht->ht[sel]; n; n = n->next)
 240                if (n->handle == handle)
 241                        break;
 242out:
 243        return n;
 244}
 245
 246
 247static unsigned long u32_get(struct tcf_proto *tp, u32 handle)
 248{
 249        struct tc_u_hnode *ht;
 250        struct tc_u_common *tp_c = tp->data;
 251
 252        if (TC_U32_HTID(handle) == TC_U32_ROOT)
 253                ht = tp->root;
 254        else
 255                ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle));
 256
 257        if (!ht)
 258                return 0;
 259
 260        if (TC_U32_KEY(handle) == 0)
 261                return (unsigned long)ht;
 262
 263        return (unsigned long)u32_lookup_key(ht, handle);
 264}
 265
 266static void u32_put(struct tcf_proto *tp, unsigned long f)
 267{
 268}
 269
 270static u32 gen_new_htid(struct tc_u_common *tp_c)
 271{
 272        int i = 0x800;
 273
 274        do {
 275                if (++tp_c->hgenerator == 0x7FF)
 276                        tp_c->hgenerator = 1;
 277        } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20));
 278
 279        return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0;
 280}
 281
 282static int u32_init(struct tcf_proto *tp)
 283{
 284        struct tc_u_hnode *root_ht;
 285        struct tc_u_common *tp_c;
 286
 287        tp_c = tp->q->u32_node;
 288
 289        root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
 290        if (root_ht == NULL)
 291                return -ENOBUFS;
 292
 293        root_ht->divisor = 0;
 294        root_ht->refcnt++;
 295        root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000;
 296        root_ht->prio = tp->prio;
 297
 298        if (tp_c == NULL) {
 299                tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL);
 300                if (tp_c == NULL) {
 301                        kfree(root_ht);
 302                        return -ENOBUFS;
 303                }
 304                tp_c->q = tp->q;
 305                tp->q->u32_node = tp_c;
 306        }
 307
 308        tp_c->refcnt++;
 309        root_ht->next = tp_c->hlist;
 310        tp_c->hlist = root_ht;
 311        root_ht->tp_c = tp_c;
 312
 313        tp->root = root_ht;
 314        tp->data = tp_c;
 315        return 0;
 316}
 317
 318static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n)
 319{
 320        tcf_unbind_filter(tp, &n->res);
 321        tcf_exts_destroy(tp, &n->exts);
 322        if (n->ht_down)
 323                n->ht_down->refcnt--;
 324#ifdef CONFIG_CLS_U32_PERF
 325        kfree(n->pf);
 326#endif
 327        kfree(n);
 328        return 0;
 329}
 330
 331static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key)
 332{
 333        struct tc_u_knode **kp;
 334        struct tc_u_hnode *ht = key->ht_up;
 335
 336        if (ht) {
 337                for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) {
 338                        if (*kp == key) {
 339                                tcf_tree_lock(tp);
 340                                *kp = key->next;
 341                                tcf_tree_unlock(tp);
 342
 343                                u32_destroy_key(tp, key);
 344                                return 0;
 345                        }
 346                }
 347        }
 348        WARN_ON(1);
 349        return 0;
 350}
 351
 352static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 353{
 354        struct tc_u_knode *n;
 355        unsigned h;
 356
 357        for (h=0; h<=ht->divisor; h++) {
 358                while ((n = ht->ht[h]) != NULL) {
 359                        ht->ht[h] = n->next;
 360
 361                        u32_destroy_key(tp, n);
 362                }
 363        }
 364}
 365
 366static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
 367{
 368        struct tc_u_common *tp_c = tp->data;
 369        struct tc_u_hnode **hn;
 370
 371        WARN_ON(ht->refcnt);
 372
 373        u32_clear_hnode(tp, ht);
 374
 375        for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) {
 376                if (*hn == ht) {
 377                        *hn = ht->next;
 378                        kfree(ht);
 379                        return 0;
 380                }
 381        }
 382
 383        WARN_ON(1);
 384        return -ENOENT;
 385}
 386
 387static void u32_destroy(struct tcf_proto *tp)
 388{
 389        struct tc_u_common *tp_c = tp->data;
 390        struct tc_u_hnode *root_ht = xchg(&tp->root, NULL);
 391
 392        WARN_ON(root_ht == NULL);
 393
 394        if (root_ht && --root_ht->refcnt == 0)
 395                u32_destroy_hnode(tp, root_ht);
 396
 397        if (--tp_c->refcnt == 0) {
 398                struct tc_u_hnode *ht;
 399
 400                tp->q->u32_node = NULL;
 401
 402                for (ht = tp_c->hlist; ht; ht = ht->next) {
 403                        ht->refcnt--;
 404                        u32_clear_hnode(tp, ht);
 405                }
 406
 407                while ((ht = tp_c->hlist) != NULL) {
 408                        tp_c->hlist = ht->next;
 409
 410                        WARN_ON(ht->refcnt != 0);
 411
 412                        kfree(ht);
 413                }
 414
 415                kfree(tp_c);
 416        }
 417
 418        tp->data = NULL;
 419}
 420
 421static int u32_delete(struct tcf_proto *tp, unsigned long arg)
 422{
 423        struct tc_u_hnode *ht = (struct tc_u_hnode*)arg;
 424
 425        if (ht == NULL)
 426                return 0;
 427
 428        if (TC_U32_KEY(ht->handle))
 429                return u32_delete_key(tp, (struct tc_u_knode*)ht);
 430
 431        if (tp->root == ht)
 432                return -EINVAL;
 433
 434        if (ht->refcnt == 1) {
 435                ht->refcnt--;
 436                u32_destroy_hnode(tp, ht);
 437        } else {
 438                return -EBUSY;
 439        }
 440
 441        return 0;
 442}
 443
 444static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle)
 445{
 446        struct tc_u_knode *n;
 447        unsigned i = 0x7FF;
 448
 449        for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next)
 450                if (i < TC_U32_NODE(n->handle))
 451                        i = TC_U32_NODE(n->handle);
 452        i++;
 453
 454        return handle|(i>0xFFF ? 0xFFF : i);
 455}
 456
 457static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 458        [TCA_U32_CLASSID]       = { .type = NLA_U32 },
 459        [TCA_U32_HASH]          = { .type = NLA_U32 },
 460        [TCA_U32_LINK]          = { .type = NLA_U32 },
 461        [TCA_U32_DIVISOR]       = { .type = NLA_U32 },
 462        [TCA_U32_SEL]           = { .len = sizeof(struct tc_u32_sel) },
 463        [TCA_U32_INDEV]         = { .type = NLA_STRING, .len = IFNAMSIZ },
 464        [TCA_U32_MARK]          = { .len = sizeof(struct tc_u32_mark) },
 465};
 466
 467static int u32_set_parms(struct tcf_proto *tp, unsigned long base,
 468                         struct tc_u_hnode *ht,
 469                         struct tc_u_knode *n, struct nlattr **tb,
 470                         struct nlattr *est)
 471{
 472        int err;
 473        struct tcf_exts e;
 474
 475        err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map);
 476        if (err < 0)
 477                return err;
 478
 479        err = -EINVAL;
 480        if (tb[TCA_U32_LINK]) {
 481                u32 handle = nla_get_u32(tb[TCA_U32_LINK]);
 482                struct tc_u_hnode *ht_down = NULL;
 483
 484                if (TC_U32_KEY(handle))
 485                        goto errout;
 486
 487                if (handle) {
 488                        ht_down = u32_lookup_ht(ht->tp_c, handle);
 489
 490                        if (ht_down == NULL)
 491                                goto errout;
 492                        ht_down->refcnt++;
 493                }
 494
 495                tcf_tree_lock(tp);
 496                ht_down = xchg(&n->ht_down, ht_down);
 497                tcf_tree_unlock(tp);
 498
 499                if (ht_down)
 500                        ht_down->refcnt--;
 501        }
 502        if (tb[TCA_U32_CLASSID]) {
 503                n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]);
 504                tcf_bind_filter(tp, &n->res, base);
 505        }
 506
 507#ifdef CONFIG_NET_CLS_IND
 508        if (tb[TCA_U32_INDEV]) {
 509                err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]);
 510                if (err < 0)
 511                        goto errout;
 512        }
 513#endif
 514        tcf_exts_change(tp, &n->exts, &e);
 515
 516        return 0;
 517errout:
 518        tcf_exts_destroy(tp, &e);
 519        return err;
 520}
 521
 522static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle,
 523                      struct nlattr **tca,
 524                      unsigned long *arg)
 525{
 526        struct tc_u_common *tp_c = tp->data;
 527        struct tc_u_hnode *ht;
 528        struct tc_u_knode *n;
 529        struct tc_u32_sel *s;
 530        struct nlattr *opt = tca[TCA_OPTIONS];
 531        struct nlattr *tb[TCA_U32_MAX + 1];
 532        u32 htid;
 533        int err;
 534
 535        if (opt == NULL)
 536                return handle ? -EINVAL : 0;
 537
 538        err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy);
 539        if (err < 0)
 540                return err;
 541
 542        if ((n = (struct tc_u_knode*)*arg) != NULL) {
 543                if (TC_U32_KEY(n->handle) == 0)
 544                        return -EINVAL;
 545
 546                return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]);
 547        }
 548
 549        if (tb[TCA_U32_DIVISOR]) {
 550                unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]);
 551
 552                if (--divisor > 0x100)
 553                        return -EINVAL;
 554                if (TC_U32_KEY(handle))
 555                        return -EINVAL;
 556                if (handle == 0) {
 557                        handle = gen_new_htid(tp->data);
 558                        if (handle == 0)
 559                                return -ENOMEM;
 560                }
 561                ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL);
 562                if (ht == NULL)
 563                        return -ENOBUFS;
 564                ht->tp_c = tp_c;
 565                ht->refcnt = 1;
 566                ht->divisor = divisor;
 567                ht->handle = handle;
 568                ht->prio = tp->prio;
 569                ht->next = tp_c->hlist;
 570                tp_c->hlist = ht;
 571                *arg = (unsigned long)ht;
 572                return 0;
 573        }
 574
 575        if (tb[TCA_U32_HASH]) {
 576                htid = nla_get_u32(tb[TCA_U32_HASH]);
 577                if (TC_U32_HTID(htid) == TC_U32_ROOT) {
 578                        ht = tp->root;
 579                        htid = ht->handle;
 580                } else {
 581                        ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid));
 582                        if (ht == NULL)
 583                                return -EINVAL;
 584                }
 585        } else {
 586                ht = tp->root;
 587                htid = ht->handle;
 588        }
 589
 590        if (ht->divisor < TC_U32_HASH(htid))
 591                return -EINVAL;
 592
 593        if (handle) {
 594                if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid))
 595                        return -EINVAL;
 596                handle = htid | TC_U32_NODE(handle);
 597        } else
 598                handle = gen_new_kid(ht, htid);
 599
 600        if (tb[TCA_U32_SEL] == NULL)
 601                return -EINVAL;
 602
 603        s = nla_data(tb[TCA_U32_SEL]);
 604
 605        n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL);
 606        if (n == NULL)
 607                return -ENOBUFS;
 608
 609#ifdef CONFIG_CLS_U32_PERF
 610        n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL);
 611        if (n->pf == NULL) {
 612                kfree(n);
 613                return -ENOBUFS;
 614        }
 615#endif
 616
 617        memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key));
 618        n->ht_up = ht;
 619        n->handle = handle;
 620        n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0;
 621
 622#ifdef CONFIG_CLS_U32_MARK
 623        if (tb[TCA_U32_MARK]) {
 624                struct tc_u32_mark *mark;
 625
 626                mark = nla_data(tb[TCA_U32_MARK]);
 627                memcpy(&n->mark, mark, sizeof(struct tc_u32_mark));
 628                n->mark.success = 0;
 629        }
 630#endif
 631
 632        err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]);
 633        if (err == 0) {
 634                struct tc_u_knode **ins;
 635                for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next)
 636                        if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle))
 637                                break;
 638
 639                n->next = *ins;
 640                wmb();
 641                *ins = n;
 642
 643                *arg = (unsigned long)n;
 644                return 0;
 645        }
 646#ifdef CONFIG_CLS_U32_PERF
 647        kfree(n->pf);
 648#endif
 649        kfree(n);
 650        return err;
 651}
 652
 653static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 654{
 655        struct tc_u_common *tp_c = tp->data;
 656        struct tc_u_hnode *ht;
 657        struct tc_u_knode *n;
 658        unsigned h;
 659
 660        if (arg->stop)
 661                return;
 662
 663        for (ht = tp_c->hlist; ht; ht = ht->next) {
 664                if (ht->prio != tp->prio)
 665                        continue;
 666                if (arg->count >= arg->skip) {
 667                        if (arg->fn(tp, (unsigned long)ht, arg) < 0) {
 668                                arg->stop = 1;
 669                                return;
 670                        }
 671                }
 672                arg->count++;
 673                for (h = 0; h <= ht->divisor; h++) {
 674                        for (n = ht->ht[h]; n; n = n->next) {
 675                                if (arg->count < arg->skip) {
 676                                        arg->count++;
 677                                        continue;
 678                                }
 679                                if (arg->fn(tp, (unsigned long)n, arg) < 0) {
 680                                        arg->stop = 1;
 681                                        return;
 682                                }
 683                                arg->count++;
 684                        }
 685                }
 686        }
 687}
 688
 689static int u32_dump(struct tcf_proto *tp, unsigned long fh,
 690                     struct sk_buff *skb, struct tcmsg *t)
 691{
 692        struct tc_u_knode *n = (struct tc_u_knode*)fh;
 693        struct nlattr *nest;
 694
 695        if (n == NULL)
 696                return skb->len;
 697
 698        t->tcm_handle = n->handle;
 699
 700        nest = nla_nest_start(skb, TCA_OPTIONS);
 701        if (nest == NULL)
 702                goto nla_put_failure;
 703
 704        if (TC_U32_KEY(n->handle) == 0) {
 705                struct tc_u_hnode *ht = (struct tc_u_hnode*)fh;
 706                u32 divisor = ht->divisor+1;
 707                NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor);
 708        } else {
 709                NLA_PUT(skb, TCA_U32_SEL,
 710                        sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key),
 711                        &n->sel);
 712                if (n->ht_up) {
 713                        u32 htid = n->handle & 0xFFFFF000;
 714                        NLA_PUT_U32(skb, TCA_U32_HASH, htid);
 715                }
 716                if (n->res.classid)
 717                        NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid);
 718                if (n->ht_down)
 719                        NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle);
 720
 721#ifdef CONFIG_CLS_U32_MARK
 722                if (n->mark.val || n->mark.mask)
 723                        NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark);
 724#endif
 725
 726                if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0)
 727                        goto nla_put_failure;
 728
 729#ifdef CONFIG_NET_CLS_IND
 730                if(strlen(n->indev))
 731                        NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev);
 732#endif
 733#ifdef CONFIG_CLS_U32_PERF
 734                NLA_PUT(skb, TCA_U32_PCNT,
 735                sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64),
 736                        n->pf);
 737#endif
 738        }
 739
 740        nla_nest_end(skb, nest);
 741
 742        if (TC_U32_KEY(n->handle))
 743                if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0)
 744                        goto nla_put_failure;
 745        return skb->len;
 746
 747nla_put_failure:
 748        nla_nest_cancel(skb, nest);
 749        return -1;
 750}
 751
 752static struct tcf_proto_ops cls_u32_ops __read_mostly = {
 753        .kind           =       "u32",
 754        .classify       =       u32_classify,
 755        .init           =       u32_init,
 756        .destroy        =       u32_destroy,
 757        .get            =       u32_get,
 758        .put            =       u32_put,
 759        .change         =       u32_change,
 760        .delete         =       u32_delete,
 761        .walk           =       u32_walk,
 762        .dump           =       u32_dump,
 763        .owner          =       THIS_MODULE,
 764};
 765
 766static int __init init_u32(void)
 767{
 768        printk("u32 classifier\n");
 769#ifdef CONFIG_CLS_U32_PERF
 770        printk("    Performance counters on\n");
 771#endif
 772#ifdef CONFIG_NET_CLS_IND
 773        printk("    input device check on \n");
 774#endif
 775#ifdef CONFIG_NET_CLS_ACT
 776        printk("    Actions configured \n");
 777#endif
 778        return register_tcf_proto_ops(&cls_u32_ops);
 779}
 780
 781static void __exit exit_u32(void)
 782{
 783        unregister_tcf_proto_ops(&cls_u32_ops);
 784}
 785
 786module_init(init_u32)
 787module_exit(exit_u32)
 788MODULE_LICENSE("GPL");
 789
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