net/sched/cls_rsvp.h

   1 /*
   2  * net/sched/cls_rsvp.h Template file for RSVPv[46] classifiers.
   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
  12 /*
  13    Comparing to general packet classification problem,
  14    RSVP needs only sevaral relatively simple rules:
  15
  16    * (dst, protocol) are always specified,
  17      so that we are able to hash them.
  18    * src may be exact, or may be wildcard, so that
  19      we can keep a hash table plus one wildcard entry.
  20    * source port (or flow label) is important only if src is given.
  21
  22    IMPLEMENTATION.
  23
  24    We use a two level hash table: The top level is keyed by
  25    destination address and protocol ID, every bucket contains a list
  26    of "rsvp sessions", identified by destination address, protocol and
  27    DPI(="Destination Port ID"): triple (key, mask, offset).
  28
  29    Every bucket has a smaller hash table keyed by source address
  30    (cf. RSVP flowspec) and one wildcard entry for wildcard reservations.
  31    Every bucket is again a list of "RSVP flows", selected by
  32    source address and SPI(="Source Port ID" here rather than
  33    "security parameter index"): triple (key, mask, offset).
  34
  35
  36    NOTE 1. All the packets with IPv6 extension headers (but AH and ESP)
  37    and all fragmented packets go to the best-effort traffic class.
  38
  39
  40    NOTE 2. Two "port id"'s seems to be redundant, rfc2207 requires
  41    only one "Generalized Port Identifier". So that for classic
  42    ah, esp (and udp,tcp) both *pi should coincide or one of them
  43    should be wildcard.
  44
  45    At first sight, this redundancy is just a waste of CPU
  46    resources. But DPI and SPI add the possibility to assign different
  47    priorities to GPIs. Look also at note 4 about tunnels below.
  48
  49
  50    NOTE 3. One complication is the case of tunneled packets.
  51    We implement it as following: if the first lookup
  52    matches a special session with "tunnelhdr" value not zero,
  53    flowid doesn't contain the true flow ID, but the tunnel ID (1...255).
  54    In this case, we pull tunnelhdr bytes and restart lookup
  55    with tunnel ID added to the list of keys. Simple and stupid 8)8)
  56    It's enough for PIMREG and IPIP.
  57
  58
  59    NOTE 4. Two GPIs make it possible to parse even GRE packets.
  60    F.e. DPI can select ETH_P_IP (and necessary flags to make
  61    tunnelhdr correct) in GRE protocol field and SPI matches
  62    GRE key. Is it not nice? 8)8)
  63
  64
  65    Well, as result, despite its simplicity, we get a pretty
  66    powerful classification engine.  */
  67
  68
  69 struct rsvp_head {
  70         u32                     tmap[256/32];
  71         u32                     hgenerator;
  72         u8                      tgenerator;
  73         struct rsvp_session __rcu *ht[256];
  74         struct rcu_head         rcu;
  75 };
  76
  77 struct rsvp_session {
  78         struct rsvp_session __rcu       *next;
  79         __be32                          dst[RSVP_DST_LEN];
  80         struct tc_rsvp_gpi              dpi;
  81         u8                              protocol;
  82         u8                              tunnelid;
  83         /* 16 (src,sport) hash slots, and one wildcard source slot */
  84         struct rsvp_filter __rcu        *ht[16 + 1];
  85         struct rcu_head                 rcu;
  86 };
  87
  88
  89 struct rsvp_filter {
  90         struct rsvp_filter __rcu        *next;
  91         __be32                          src[RSVP_DST_LEN];
  92         struct tc_rsvp_gpi              spi;
  93         u8                              tunnelhdr;
  94
  95         struct tcf_result               res;
  96         struct tcf_exts                 exts;
  97
  98         u32                             handle;
  99         struct rsvp_session             *sess;
 100         struct rcu_head                 rcu;
 101 };
 102
 103 static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid)
 104 {
 105         unsigned int h = (__force __u32)dst[RSVP_DST_LEN - 1];
 106
 107         h ^= h>>16;
 108         h ^= h>>8;
 109         return (h ^ protocol ^ tunnelid) & 0xFF;
 110 }
 111
 112 static inline unsigned int hash_src(__be32 *src)
 113 {
 114         unsigned int h = (__force __u32)src[RSVP_DST_LEN-1];
 115
 116         h ^= h>>16;
 117         h ^= h>>8;
 118         h ^= h>>4;
 119         return h & 0xF;
 120 }
 121
 122 #define RSVP_APPLY_RESULT()                             \
 123 {                                                       \
 124         int r = tcf_exts_exec(skb, &f->exts, res);      \
 125         if (r < 0)                                      \
 126                 continue;                               \
 127         else if (r > 0)                                 \
 128                 return r;                               \
 129 }
 130
 131 static int rsvp_classify(struct sk_buff *skb, const struct tcf_proto *tp,
 132                          struct tcf_result *res)
 133 {
 134         struct rsvp_head *head = rcu_dereference_bh(tp->root);
 135         struct rsvp_session *s;
 136         struct rsvp_filter *f;
 137         unsigned int h1, h2;
 138         __be32 *dst, *src;
 139         u8 protocol;
 140         u8 tunnelid = 0;
 141         u8 *xprt;
 142 #if RSVP_DST_LEN == 4
 143         struct ipv6hdr *nhptr;
 144
 145         if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
 146                 return -1;
 147         nhptr = ipv6_hdr(skb);
 148 #else
 149         struct iphdr *nhptr;
 150
 151         if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
 152                 return -1;
 153         nhptr = ip_hdr(skb);
 154 #endif
 155         if (unlikely(!head))
 156                 return -1;
 157 restart:
 158
 159 #if RSVP_DST_LEN == 4
 160         src = &nhptr->saddr.s6_addr32[0];
 161         dst = &nhptr->daddr.s6_addr32[0];
 162         protocol = nhptr->nexthdr;
 163         xprt = ((u8 *)nhptr) + sizeof(struct ipv6hdr);
 164 #else
 165         src = &nhptr->saddr;
 166         dst = &nhptr->daddr;
 167         protocol = nhptr->protocol;
 168         xprt = ((u8 *)nhptr) + (nhptr->ihl<<2);
 169         if (ip_is_fragment(nhptr))
 170                 return -1;
 171 #endif
 172
 173         h1 = hash_dst(dst, protocol, tunnelid);
 174         h2 = hash_src(src);
 175
 176         for (s = rcu_dereference_bh(head->ht[h1]); s;
 177              s = rcu_dereference_bh(s->next)) {
 178                 if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN - 1] &&
 179                     protocol == s->protocol &&
 180                     !(s->dpi.mask &
 181                       (*(u32 *)(xprt + s->dpi.offset) ^ s->dpi.key)) &&
 182 #if RSVP_DST_LEN == 4
 183                     dst[0] == s->dst[0] &&
 184                     dst[1] == s->dst[1] &&
 185                     dst[2] == s->dst[2] &&
 186 #endif
 187                     tunnelid == s->tunnelid) {
 188
 189                         for (f = rcu_dereference_bh(s->ht[h2]); f;
 190                              f = rcu_dereference_bh(f->next)) {
 191                                 if (src[RSVP_DST_LEN-1] == f->src[RSVP_DST_LEN - 1] &&
 192                                     !(f->spi.mask & (*(u32 *)(xprt + f->spi.offset) ^ f->spi.key))
 193 #if RSVP_DST_LEN == 4
 194                                     &&
 195                                     src[0] == f->src[0] &&
 196                                     src[1] == f->src[1] &&
 197                                     src[2] == f->src[2]
 198 #endif
 199                                     ) {
 200                                         *res = f->res;
 201                                         RSVP_APPLY_RESULT();
 202
 203 matched:
 204                                         if (f->tunnelhdr == 0)
 205                                                 return 0;
 206
 207                                         tunnelid = f->res.classid;
 208                                         nhptr = (void *)(xprt + f->tunnelhdr - sizeof(*nhptr));
 209                                         goto restart;
 210                                 }
 211                         }
 212
 213                         /* And wildcard bucket... */
 214                         for (f = rcu_dereference_bh(s->ht[16]); f;
 215                              f = rcu_dereference_bh(f->next)) {
 216                                 *res = f->res;
 217                                 RSVP_APPLY_RESULT();
 218                                 goto matched;
 219                         }
 220                         return -1;
 221                 }
 222         }
 223         return -1;
 224 }
 225
 226 static void rsvp_replace(struct tcf_proto *tp, struct rsvp_filter *n, u32 h)
 227 {
 228         struct rsvp_head *head = rtnl_dereference(tp->root);
 229         struct rsvp_session *s;
 230         struct rsvp_filter __rcu **ins;
 231         struct rsvp_filter *pins;
 232         unsigned int h1 = h & 0xFF;
 233         unsigned int h2 = (h >> 8) & 0xFF;
 234
 235         for (s = rtnl_dereference(head->ht[h1]); s;
 236              s = rtnl_dereference(s->next)) {
 237                 for (ins = &s->ht[h2], pins = rtnl_dereference(*ins); ;
 238                      ins = &pins->next, pins = rtnl_dereference(*ins)) {
 239                         if (pins->handle == h) {
 240                                 RCU_INIT_POINTER(n->next, pins->next);
 241                                 rcu_assign_pointer(*ins, n);
 242                                 return;
 243                         }
 244                 }
 245         }
 246
 247         /* Something went wrong if we are trying to replace a non-existant
 248          * node. Mind as well halt instead of silently failing.
 249          */
 250         BUG_ON(1);
 251 }
 252
 253 static unsigned long rsvp_get(struct tcf_proto *tp, u32 handle)
 254 {
 255         struct rsvp_head *head = rtnl_dereference(tp->root);
 256         struct rsvp_session *s;
 257         struct rsvp_filter *f;
 258         unsigned int h1 = handle & 0xFF;
 259         unsigned int h2 = (handle >> 8) & 0xFF;
 260
 261         if (h2 > 16)
 262                 return 0;
 263
 264         for (s = rtnl_dereference(head->ht[h1]); s;
 265              s = rtnl_dereference(s->next)) {
 266                 for (f = rtnl_dereference(s->ht[h2]); f;
 267                      f = rtnl_dereference(f->next)) {
 268                         if (f->handle == handle)
 269                                 return (unsigned long)f;
 270                 }
 271         }
 272         return 0;
 273 }
 274
 275 static int rsvp_init(struct tcf_proto *tp)
 276 {
 277         struct rsvp_head *data;
 278
 279         data = kzalloc(sizeof(struct rsvp_head), GFP_KERNEL);
 280         if (data) {
 281                 rcu_assign_pointer(tp->root, data);
 282                 return 0;
 283         }
 284         return -ENOBUFS;
 285 }
 286
 287 static void rsvp_delete_filter_rcu(struct rcu_head *head)
 288 {
 289         struct rsvp_filter *f = container_of(head, struct rsvp_filter, rcu);
 290
 291         tcf_exts_destroy(&f->exts);
 292         kfree(f);
 293 }
 294
 295 static void rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
 296 {
 297         tcf_unbind_filter(tp, &f->res);
 298         /* all classifiers are required to call tcf_exts_destroy() after rcu
 299          * grace period, since converted-to-rcu actions are relying on that
 300          * in cleanup() callback
 301          */
 302         call_rcu(&f->rcu, rsvp_delete_filter_rcu);
 303 }
 304
 305 static bool rsvp_destroy(struct tcf_proto *tp, bool force)
 306 {
 307         struct rsvp_head *data = rtnl_dereference(tp->root);
 308         int h1, h2;
 309
 310         if (data == NULL)
 311                 return true;
 312
 313         if (!force) {
 314                 for (h1 = 0; h1 < 256; h1++) {
 315                         if (rcu_access_pointer(data->ht[h1]))
 316                                 return false;
 317                 }
 318         }
 319
 320         RCU_INIT_POINTER(tp->root, NULL);
 321
 322         for (h1 = 0; h1 < 256; h1++) {
 323                 struct rsvp_session *s;
 324
 325                 while ((s = rtnl_dereference(data->ht[h1])) != NULL) {
 326                         RCU_INIT_POINTER(data->ht[h1], s->next);
 327
 328                         for (h2 = 0; h2 <= 16; h2++) {
 329                                 struct rsvp_filter *f;
 330
 331                                 while ((f = rtnl_dereference(s->ht[h2])) != NULL) {
 332                                         rcu_assign_pointer(s->ht[h2], f->next);
 333                                         rsvp_delete_filter(tp, f);
 334                                 }
 335                         }
 336                         kfree_rcu(s, rcu);
 337                 }
 338         }
 339         kfree_rcu(data, rcu);
 340         return true;
 341 }
 342
 343 static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
 344 {
 345         struct rsvp_head *head = rtnl_dereference(tp->root);
 346         struct rsvp_filter *nfp, *f = (struct rsvp_filter *)arg;
 347         struct rsvp_filter __rcu **fp;
 348         unsigned int h = f->handle;
 349         struct rsvp_session __rcu **sp;
 350         struct rsvp_session *nsp, *s = f->sess;
 351         int i;
 352
 353         fp = &s->ht[(h >> 8) & 0xFF];
 354         for (nfp = rtnl_dereference(*fp); nfp;
 355              fp = &nfp->next, nfp = rtnl_dereference(*fp)) {
 356                 if (nfp == f) {
 357                         RCU_INIT_POINTER(*fp, f->next);
 358                         rsvp_delete_filter(tp, f);
 359
 360                         /* Strip tree */
 361
 362                         for (i = 0; i <= 16; i++)
 363                                 if (s->ht[i])
 364                                         return 0;
 365
 366                         /* OK, session has no flows */
 367                         sp = &head->ht[h & 0xFF];
 368                         for (nsp = rtnl_dereference(*sp); nsp;
 369                              sp = &nsp->next, nsp = rtnl_dereference(*sp)) {
 370                                 if (nsp == s) {
 371                                         RCU_INIT_POINTER(*sp, s->next);
 372                                         kfree_rcu(s, rcu);
 373                                         return 0;
 374                                 }
 375                         }
 376
 377                         return 0;
 378                 }
 379         }
 380         return 0;
 381 }
 382
 383 static unsigned int gen_handle(struct tcf_proto *tp, unsigned salt)
 384 {
 385         struct rsvp_head *data = rtnl_dereference(tp->root);
 386         int i = 0xFFFF;
 387
 388         while (i-- > 0) {
 389                 u32 h;
 390
 391                 if ((data->hgenerator += 0x10000) == 0)
 392                         data->hgenerator = 0x10000;
 393                 h = data->hgenerator|salt;
 394                 if (rsvp_get(tp, h) == 0)
 395                         return h;
 396         }
 397         return 0;
 398 }
 399
 400 static int tunnel_bts(struct rsvp_head *data)
 401 {
 402         int n = data->tgenerator >> 5;
 403         u32 b = 1 << (data->tgenerator & 0x1F);
 404
 405         if (data->tmap[n] & b)
 406                 return 0;
 407         data->tmap[n] |= b;
 408         return 1;
 409 }
 410
 411 static void tunnel_recycle(struct rsvp_head *data)
 412 {
 413         struct rsvp_session __rcu **sht = data->ht;
 414         u32 tmap[256/32];
 415         int h1, h2;
 416
 417         memset(tmap, 0, sizeof(tmap));
 418
 419         for (h1 = 0; h1 < 256; h1++) {
 420                 struct rsvp_session *s;
 421                 for (s = rtnl_dereference(sht[h1]); s;
 422                      s = rtnl_dereference(s->next)) {
 423                         for (h2 = 0; h2 <= 16; h2++) {
 424                                 struct rsvp_filter *f;
 425
 426                                 for (f = rtnl_dereference(s->ht[h2]); f;
 427                                      f = rtnl_dereference(f->next)) {
 428                                         if (f->tunnelhdr == 0)
 429                                                 continue;
 430                                         data->tgenerator = f->res.classid;
 431                                         tunnel_bts(data);
 432                                 }
 433                         }
 434                 }
 435         }
 436
 437         memcpy(data->tmap, tmap, sizeof(tmap));
 438 }
 439
 440 static u32 gen_tunnel(struct rsvp_head *data)
 441 {
 442         int i, k;
 443
 444         for (k = 0; k < 2; k++) {
 445                 for (i = 255; i > 0; i--) {
 446                         if (++data->tgenerator == 0)
 447                                 data->tgenerator = 1;
 448                         if (tunnel_bts(data))
 449                                 return data->tgenerator;
 450                 }
 451                 tunnel_recycle(data);
 452         }
 453         return 0;
 454 }
 455
 456 static const struct nla_policy rsvp_policy[TCA_RSVP_MAX + 1] = {
 457         [TCA_RSVP_CLASSID]      = { .type = NLA_U32 },
 458         [TCA_RSVP_DST]          = { .len = RSVP_DST_LEN * sizeof(u32) },
 459         [TCA_RSVP_SRC]          = { .len = RSVP_DST_LEN * sizeof(u32) },
 460         [TCA_RSVP_PINFO]        = { .len = sizeof(struct tc_rsvp_pinfo) },
 461 };
 462
 463 static int rsvp_change(struct net *net, struct sk_buff *in_skb,
 464                        struct tcf_proto *tp, unsigned long base,
 465                        u32 handle,
 466                        struct nlattr **tca,
 467                        unsigned long *arg, bool ovr)
 468 {
 469         struct rsvp_head *data = rtnl_dereference(tp->root);
 470         struct rsvp_filter *f, *nfp;
 471         struct rsvp_filter __rcu **fp;
 472         struct rsvp_session *nsp, *s;
 473         struct rsvp_session __rcu **sp;
 474         struct tc_rsvp_pinfo *pinfo = NULL;
 475         struct nlattr *opt = tca[TCA_OPTIONS];
 476         struct nlattr *tb[TCA_RSVP_MAX + 1];
 477         struct tcf_exts e;
 478         unsigned int h1, h2;
 479         __be32 *dst;
 480         int err;
 481
 482         if (opt == NULL)
 483                 return handle ? -EINVAL : 0;
 484
 485         err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy);
 486         if (err < 0)
 487                 return err;
 488
 489         err = tcf_exts_init(&e, TCA_RSVP_ACT, TCA_RSVP_POLICE);
 490         if (err < 0)
 491                 return err;
 492         err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
 493         if (err < 0)
 494                 goto errout2;
 495
 496         f = (struct rsvp_filter *)*arg;
 497         if (f) {
 498                 /* Node exists: adjust only classid */
 499                 struct rsvp_filter *n;
 500
 501                 if (f->handle != handle && handle)
 502                         goto errout2;
 503
 504                 n = kmemdup(f, sizeof(*f), GFP_KERNEL);
 505                 if (!n) {
 506                         err = -ENOMEM;
 507                         goto errout2;
 508                 }
 509
 510                 err = tcf_exts_init(&n->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE);
 511                 if (err < 0) {
 512                         kfree(n);
 513                         goto errout2;
 514                 }
 515
 516                 if (tb[TCA_RSVP_CLASSID]) {
 517                         n->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
 518                         tcf_bind_filter(tp, &n->res, base);
 519                 }
 520
 521                 tcf_exts_change(tp, &n->exts, &e);
 522                 rsvp_replace(tp, n, handle);
 523                 return 0;
 524         }
 525
 526         /* Now more serious part... */
 527         err = -EINVAL;
 528         if (handle)
 529                 goto errout2;
 530         if (tb[TCA_RSVP_DST] == NULL)
 531                 goto errout2;
 532
 533         err = -ENOBUFS;
 534         f = kzalloc(sizeof(struct rsvp_filter), GFP_KERNEL);
 535         if (f == NULL)
 536                 goto errout2;
 537
 538         err = tcf_exts_init(&f->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE);
 539         if (err < 0)
 540                 goto errout;
 541         h2 = 16;
 542         if (tb[TCA_RSVP_SRC]) {
 543                 memcpy(f->src, nla_data(tb[TCA_RSVP_SRC]), sizeof(f->src));
 544                 h2 = hash_src(f->src);
 545         }
 546         if (tb[TCA_RSVP_PINFO]) {
 547                 pinfo = nla_data(tb[TCA_RSVP_PINFO]);
 548                 f->spi = pinfo->spi;
 549                 f->tunnelhdr = pinfo->tunnelhdr;
 550         }
 551         if (tb[TCA_RSVP_CLASSID])
 552                 f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
 553
 554         dst = nla_data(tb[TCA_RSVP_DST]);
 555         h1 = hash_dst(dst, pinfo ? pinfo->protocol : 0, pinfo ? pinfo->tunnelid : 0);
 556
 557         err = -ENOMEM;
 558         if ((f->handle = gen_handle(tp, h1 | (h2<<8))) == 0)
 559                 goto errout;
 560
 561         if (f->tunnelhdr) {
 562                 err = -EINVAL;
 563                 if (f->res.classid > 255)
 564                         goto errout;
 565
 566                 err = -ENOMEM;
 567                 if (f->res.classid == 0 &&
 568                     (f->res.classid = gen_tunnel(data)) == 0)
 569                         goto errout;
 570         }
 571
 572         for (sp = &data->ht[h1];
 573              (s = rtnl_dereference(*sp)) != NULL;
 574              sp = &s->next) {
 575                 if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN-1] &&
 576                     pinfo && pinfo->protocol == s->protocol &&
 577                     memcmp(&pinfo->dpi, &s->dpi, sizeof(s->dpi)) == 0 &&
 578 #if RSVP_DST_LEN == 4
 579                     dst[0] == s->dst[0] &&
 580                     dst[1] == s->dst[1] &&
 581                     dst[2] == s->dst[2] &&
 582 #endif
 583                     pinfo->tunnelid == s->tunnelid) {
 584
 585 insert:
 586                         /* OK, we found appropriate session */
 587
 588                         fp = &s->ht[h2];
 589
 590                         f->sess = s;
 591                         if (f->tunnelhdr == 0)
 592                                 tcf_bind_filter(tp, &f->res, base);
 593
 594                         tcf_exts_change(tp, &f->exts, &e);
 595
 596                         fp = &s->ht[h2];
 597                         for (nfp = rtnl_dereference(*fp); nfp;
 598                              fp = &nfp->next, nfp = rtnl_dereference(*fp)) {
 599                                 __u32 mask = nfp->spi.mask & f->spi.mask;
 600
 601                                 if (mask != f->spi.mask)
 602                                         break;
 603                         }
 604                         RCU_INIT_POINTER(f->next, nfp);
 605                         rcu_assign_pointer(*fp, f);
 606
 607                         *arg = (unsigned long)f;
 608                         return 0;
 609                 }
 610         }
 611
 612         /* No session found. Create new one. */
 613
 614         err = -ENOBUFS;
 615         s = kzalloc(sizeof(struct rsvp_session), GFP_KERNEL);
 616         if (s == NULL)
 617                 goto errout;
 618         memcpy(s->dst, dst, sizeof(s->dst));
 619
 620         if (pinfo) {
 621                 s->dpi = pinfo->dpi;
 622                 s->protocol = pinfo->protocol;
 623                 s->tunnelid = pinfo->tunnelid;
 624         }
 625         sp = &data->ht[h1];
 626         for (nsp = rtnl_dereference(*sp); nsp;
 627              sp = &nsp->next, nsp = rtnl_dereference(*sp)) {
 628                 if ((nsp->dpi.mask & s->dpi.mask) != s->dpi.mask)
 629                         break;
 630         }
 631         RCU_INIT_POINTER(s->next, nsp);
 632         rcu_assign_pointer(*sp, s);
 633
 634         goto insert;
 635
 636 errout:
 637         tcf_exts_destroy(&f->exts);
 638         kfree(f);
 639 errout2:
 640         tcf_exts_destroy(&e);
 641         return err;
 642 }
 643
 644 static void rsvp_walk(struct tcf_proto *tp, struct tcf_walker *arg)
 645 {
 646         struct rsvp_head *head = rtnl_dereference(tp->root);
 647         unsigned int h, h1;
 648
 649         if (arg->stop)
 650                 return;
 651
 652         for (h = 0; h < 256; h++) {
 653                 struct rsvp_session *s;
 654
 655                 for (s = rtnl_dereference(head->ht[h]); s;
 656                      s = rtnl_dereference(s->next)) {
 657                         for (h1 = 0; h1 <= 16; h1++) {
 658                                 struct rsvp_filter *f;
 659
 660                                 for (f = rtnl_dereference(s->ht[h1]); f;
 661                                      f = rtnl_dereference(f->next)) {
 662                                         if (arg->count < arg->skip) {
 663                                                 arg->count++;
 664                                                 continue;
 665                                         }
 666                                         if (arg->fn(tp, (unsigned long)f, arg) < 0) {
 667                                                 arg->stop = 1;
 668                                                 return;
 669                                         }
 670                                         arg->count++;
 671                                 }
 672                         }
 673                 }
 674         }
 675 }
 676
 677 static int rsvp_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
 678                      struct sk_buff *skb, struct tcmsg *t)
 679 {
 680         struct rsvp_filter *f = (struct rsvp_filter *)fh;
 681         struct rsvp_session *s;
 682         struct nlattr *nest;
 683         struct tc_rsvp_pinfo pinfo;
 684
 685         if (f == NULL)
 686                 return skb->len;
 687         s = f->sess;
 688
 689         t->tcm_handle = f->handle;
 690
 691         nest = nla_nest_start(skb, TCA_OPTIONS);
 692         if (nest == NULL)
 693                 goto nla_put_failure;
 694
 695         if (nla_put(skb, TCA_RSVP_DST, sizeof(s->dst), &s->dst))
 696                 goto nla_put_failure;
 697         pinfo.dpi = s->dpi;
 698         pinfo.spi = f->spi;
 699         pinfo.protocol = s->protocol;
 700         pinfo.tunnelid = s->tunnelid;
 701         pinfo.tunnelhdr = f->tunnelhdr;
 702         pinfo.pad = 0;
 703         if (nla_put(skb, TCA_RSVP_PINFO, sizeof(pinfo), &pinfo))
 704                 goto nla_put_failure;
 705         if (f->res.classid &&
 706             nla_put_u32(skb, TCA_RSVP_CLASSID, f->res.classid))
 707                 goto nla_put_failure;
 708         if (((f->handle >> 8) & 0xFF) != 16 &&
 709             nla_put(skb, TCA_RSVP_SRC, sizeof(f->src), f->src))
 710                 goto nla_put_failure;
 711
 712         if (tcf_exts_dump(skb, &f->exts) < 0)
 713                 goto nla_put_failure;
 714
 715         nla_nest_end(skb, nest);
 716
 717         if (tcf_exts_dump_stats(skb, &f->exts) < 0)
 718                 goto nla_put_failure;
 719         return skb->len;
 720
 721 nla_put_failure:
 722         nla_nest_cancel(skb, nest);
 723         return -1;
 724 }
 725
 726 static struct tcf_proto_ops RSVP_OPS __read_mostly = {
 727         .kind           =       RSVP_ID,
 728         .classify       =       rsvp_classify,
 729         .init           =       rsvp_init,
 730         .destroy        =       rsvp_destroy,
 731         .get            =       rsvp_get,
 732         .change         =       rsvp_change,
 733         .delete         =       rsvp_delete,
 734         .walk           =       rsvp_walk,
 735         .dump           =       rsvp_dump,
 736         .owner          =       THIS_MODULE,
 737 };
 738
 739 static int __init init_rsvp(void)
 740 {
 741         return register_tcf_proto_ops(&RSVP_OPS);
 742 }
 743
 744 static void __exit exit_rsvp(void)
 745 {
 746         unregister_tcf_proto_ops(&RSVP_OPS);
 747 }
 748
 749 module_init(init_rsvp)
 750 module_exit(exit_rsvp)