net/sched/sch_atm.c

   1 /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
   2
   3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
   4
   5 #include <linux/module.h>
   6 #include <linux/slab.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9 #include <linux/errno.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/atmdev.h>
  12 #include <linux/atmclip.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/file.h>         /* for fput */
  15 #include <net/netlink.h>
  16 #include <net/pkt_sched.h>
  17
  18 extern struct socket *sockfd_lookup(int fd, int *err);  /* @@@ fix this */
  19
  20 /*
  21  * The ATM queuing discipline provides a framework for invoking classifiers
  22  * (aka "filters"), which in turn select classes of this queuing discipline.
  23  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  24  * may share the same VC.
  25  *
  26  * When creating a class, VCs are specified by passing the number of the open
  27  * socket descriptor by which the calling process references the VC. The kernel
  28  * keeps the VC open at least until all classes using it are removed.
  29  *
  30  * In this file, most functions are named atm_tc_* to avoid confusion with all
  31  * the atm_* in net/atm. This naming convention differs from what's used in the
  32  * rest of net/sched.
  33  *
  34  * Known bugs:
  35  *  - sometimes messes up the IP stack
  36  *  - any manipulations besides the few operations described in the README, are
  37  *    untested and likely to crash the system
  38  *  - should lock the flow while there is data in the queue (?)
  39  */
  40
  41 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  42
  43 struct atm_flow_data {
  44         struct Qdisc            *q;     /* FIFO, TBF, etc. */
  45         struct tcf_proto        *filter_list;
  46         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
  47         void                    (*old_pop)(struct atm_vcc *vcc,
  48                                            struct sk_buff *skb); /* chaining */
  49         struct atm_qdisc_data   *parent;        /* parent qdisc */
  50         struct socket           *sock;          /* for closing */
  51         u32                     classid;        /* x:y type ID */
  52         int                     ref;            /* reference count */
  53         struct gnet_stats_basic_packed  bstats;
  54         struct gnet_stats_queue qstats;
  55         struct atm_flow_data    *next;
  56         struct atm_flow_data    *excess;        /* flow for excess traffic;
  57                                                    NULL to set CLP instead */
  58         int                     hdr_len;
  59         unsigned char           hdr[0];         /* header data; MUST BE LAST */
  60 };
  61
  62 struct atm_qdisc_data {
  63         struct atm_flow_data    link;           /* unclassified skbs go here */
  64         struct atm_flow_data    *flows;         /* NB: "link" is also on this
  65                                                    list */
  66         struct tasklet_struct   task;           /* dequeue tasklet */
  67 };
  68
  69 /* ------------------------- Class/flow operations ------------------------- */
  70
  71 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
  72 {
  73         struct atm_flow_data *walk;
  74
  75         pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
  76         for (walk = qdisc->flows; walk; walk = walk->next)
  77                 if (walk == flow)
  78                         return 1;
  79         pr_debug("find_flow: not found\n");
  80         return 0;
  81 }
  82
  83 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
  84 {
  85         struct atm_qdisc_data *p = qdisc_priv(sch);
  86         struct atm_flow_data *flow;
  87
  88         for (flow = p->flows; flow; flow = flow->next)
  89                 if (flow->classid == classid)
  90                         break;
  91         return flow;
  92 }
  93
  94 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
  95                         struct Qdisc *new, struct Qdisc **old)
  96 {
  97         struct atm_qdisc_data *p = qdisc_priv(sch);
  98         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
  99
 100         pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
 101                 sch, p, flow, new, old);
 102         if (!find_flow(p, flow))
 103                 return -EINVAL;
 104         if (!new)
 105                 new = &noop_qdisc;
 106         *old = flow->q;
 107         flow->q = new;
 108         if (*old)
 109                 qdisc_reset(*old);
 110         return 0;
 111 }
 112
 113 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
 114 {
 115         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 116
 117         pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
 118         return flow ? flow->q : NULL;
 119 }
 120
 121 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
 122 {
 123         struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
 124         struct atm_flow_data *flow;
 125
 126         pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
 127         flow = lookup_flow(sch, classid);
 128         if (flow)
 129                 flow->ref++;
 130         pr_debug("atm_tc_get: flow %p\n", flow);
 131         return (unsigned long)flow;
 132 }
 133
 134 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 135                                         unsigned long parent, u32 classid)
 136 {
 137         return atm_tc_get(sch, classid);
 138 }
 139
 140 /*
 141  * atm_tc_put handles all destructions, including the ones that are explicitly
 142  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 143  * anything that still seems to be in use.
 144  */
 145 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 146 {
 147         struct atm_qdisc_data *p = qdisc_priv(sch);
 148         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 149         struct atm_flow_data **prev;
 150
 151         pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 152         if (--flow->ref)
 153                 return;
 154         pr_debug("atm_tc_put: destroying\n");
 155         for (prev = &p->flows; *prev; prev = &(*prev)->next)
 156                 if (*prev == flow)
 157                         break;
 158         if (!*prev) {
 159                 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
 160                 return;
 161         }
 162         *prev = flow->next;
 163         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
 164         qdisc_destroy(flow->q);
 165         tcf_destroy_chain(&flow->filter_list);
 166         if (flow->sock) {
 167                 pr_debug("atm_tc_put: f_count %ld\n",
 168                         file_count(flow->sock->file));
 169                 flow->vcc->pop = flow->old_pop;
 170                 sockfd_put(flow->sock);
 171         }
 172         if (flow->excess)
 173                 atm_tc_put(sch, (unsigned long)flow->excess);
 174         if (flow != &p->link)
 175                 kfree(flow);
 176         /*
 177          * If flow == &p->link, the qdisc no longer works at this point and
 178          * needs to be removed. (By the caller of atm_tc_put.)
 179          */
 180 }
 181
 182 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 183 {
 184         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 185
 186         pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
 187         VCC2FLOW(vcc)->old_pop(vcc, skb);
 188         tasklet_schedule(&p->task);
 189 }
 190
 191 static const u8 llc_oui_ip[] = {
 192         0xaa,                   /* DSAP: non-ISO */
 193         0xaa,                   /* SSAP: non-ISO */
 194         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
 195         0x00,                   /* OUI: EtherType */
 196         0x00, 0x00,
 197         0x08, 0x00
 198 };                              /* Ethertype IP (0800) */
 199
 200 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
 201         [TCA_ATM_FD]            = { .type = NLA_U32 },
 202         [TCA_ATM_EXCESS]        = { .type = NLA_U32 },
 203 };
 204
 205 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 206                          struct nlattr **tca, unsigned long *arg)
 207 {
 208         struct atm_qdisc_data *p = qdisc_priv(sch);
 209         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
 210         struct atm_flow_data *excess = NULL;
 211         struct nlattr *opt = tca[TCA_OPTIONS];
 212         struct nlattr *tb[TCA_ATM_MAX + 1];
 213         struct socket *sock;
 214         int fd, error, hdr_len;
 215         void *hdr;
 216
 217         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 218                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
 219         /*
 220          * The concept of parents doesn't apply for this qdisc.
 221          */
 222         if (parent && parent != TC_H_ROOT && parent != sch->handle)
 223                 return -EINVAL;
 224         /*
 225          * ATM classes cannot be changed. In order to change properties of the
 226          * ATM connection, that socket needs to be modified directly (via the
 227          * native ATM API. In order to send a flow to a different VC, the old
 228          * class needs to be removed and a new one added. (This may be changed
 229          * later.)
 230          */
 231         if (flow)
 232                 return -EBUSY;
 233         if (opt == NULL)
 234                 return -EINVAL;
 235
 236         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
 237         if (error < 0)
 238                 return error;
 239
 240         if (!tb[TCA_ATM_FD])
 241                 return -EINVAL;
 242         fd = nla_get_u32(tb[TCA_ATM_FD]);
 243         pr_debug("atm_tc_change: fd %d\n", fd);
 244         if (tb[TCA_ATM_HDR]) {
 245                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
 246                 hdr = nla_data(tb[TCA_ATM_HDR]);
 247         } else {
 248                 hdr_len = RFC1483LLC_LEN;
 249                 hdr = NULL;     /* default LLC/SNAP for IP */
 250         }
 251         if (!tb[TCA_ATM_EXCESS])
 252                 excess = NULL;
 253         else {
 254                 excess = (struct atm_flow_data *)
 255                         atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
 256                 if (!excess)
 257                         return -ENOENT;
 258         }
 259         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 260                  opt->nla_type, nla_len(opt), hdr_len);
 261         sock = sockfd_lookup(fd, &error);
 262         if (!sock)
 263                 return error;   /* f_count++ */
 264         pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
 265         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 266                 error = -EPROTOTYPE;
 267                 goto err_out;
 268         }
 269         /* @@@ should check if the socket is really operational or we'll crash
 270            on vcc->send */
 271         if (classid) {
 272                 if (TC_H_MAJ(classid ^ sch->handle)) {
 273                         pr_debug("atm_tc_change: classid mismatch\n");
 274                         error = -EINVAL;
 275                         goto err_out;
 276                 }
 277                 if (find_flow(p, flow)) {
 278                         error = -EEXIST;
 279                         goto err_out;
 280                 }
 281         } else {
 282                 int i;
 283                 unsigned long cl;
 284
 285                 for (i = 1; i < 0x8000; i++) {
 286                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
 287                         cl = atm_tc_get(sch, classid);
 288                         if (!cl)
 289                                 break;
 290                         atm_tc_put(sch, cl);
 291                 }
 292         }
 293         pr_debug("atm_tc_change: new id %x\n", classid);
 294         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
 295         pr_debug("atm_tc_change: flow %p\n", flow);
 296         if (!flow) {
 297                 error = -ENOBUFS;
 298                 goto err_out;
 299         }
 300         flow->filter_list = NULL;
 301         flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 302                                     &pfifo_qdisc_ops, classid);
 303         if (!flow->q)
 304                 flow->q = &noop_qdisc;
 305         pr_debug("atm_tc_change: qdisc %p\n", flow->q);
 306         flow->sock = sock;
 307         flow->vcc = ATM_SD(sock);       /* speedup */
 308         flow->vcc->user_back = flow;
 309         pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
 310         flow->old_pop = flow->vcc->pop;
 311         flow->parent = p;
 312         flow->vcc->pop = sch_atm_pop;
 313         flow->classid = classid;
 314         flow->ref = 1;
 315         flow->excess = excess;
 316         flow->next = p->link.next;
 317         p->link.next = flow;
 318         flow->hdr_len = hdr_len;
 319         if (hdr)
 320                 memcpy(flow->hdr, hdr, hdr_len);
 321         else
 322                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
 323         *arg = (unsigned long)flow;
 324         return 0;
 325 err_out:
 326         if (excess)
 327                 atm_tc_put(sch, (unsigned long)excess);
 328         sockfd_put(sock);
 329         return error;
 330 }
 331
 332 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
 333 {
 334         struct atm_qdisc_data *p = qdisc_priv(sch);
 335         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 336
 337         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 338         if (!find_flow(qdisc_priv(sch), flow))
 339                 return -EINVAL;
 340         if (flow->filter_list || flow == &p->link)
 341                 return -EBUSY;
 342         /*
 343          * Reference count must be 2: one for "keepalive" (set at class
 344          * creation), and one for the reference held when calling delete.
 345          */
 346         if (flow->ref < 2) {
 347                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
 348                 return -EINVAL;
 349         }
 350         if (flow->ref > 2)
 351                 return -EBUSY;  /* catch references via excess, etc. */
 352         atm_tc_put(sch, arg);
 353         return 0;
 354 }
 355
 356 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 357 {
 358         struct atm_qdisc_data *p = qdisc_priv(sch);
 359         struct atm_flow_data *flow;
 360
 361         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
 362         if (walker->stop)
 363                 return;
 364         for (flow = p->flows; flow; flow = flow->next) {
 365                 if (walker->count >= walker->skip)
 366                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
 367                                 walker->stop = 1;
 368                                 break;
 369                         }
 370                 walker->count++;
 371         }
 372 }
 373
 374 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
 375 {
 376         struct atm_qdisc_data *p = qdisc_priv(sch);
 377         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 378
 379         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 380         return flow ? &flow->filter_list : &p->link.filter_list;
 381 }
 382
 383 /* --------------------------- Qdisc operations ---------------------------- */
 384
 385 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
 386 {
 387         struct atm_qdisc_data *p = qdisc_priv(sch);
 388         struct atm_flow_data *flow = NULL;      /* @@@ */
 389         struct tcf_result res;
 390         int result;
 391         int ret = NET_XMIT_POLICED;
 392
 393         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 394         result = TC_POLICE_OK;  /* be nice to gcc */
 395         if (TC_H_MAJ(skb->priority) != sch->handle ||
 396             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
 397                 for (flow = p->flows; flow; flow = flow->next)
 398                         if (flow->filter_list) {
 399                                 result = tc_classify_compat(skb,
 400                                                             flow->filter_list,
 401                                                             &res);
 402                                 if (result < 0)
 403                                         continue;
 404                                 flow = (struct atm_flow_data *)res.class;
 405                                 if (!flow)
 406                                         flow = lookup_flow(sch, res.classid);
 407                                 break;
 408                         }
 409         if (!flow)
 410                 flow = &p->link;
 411         else {
 412                 if (flow->vcc)
 413                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 414                 /*@@@ looks good ... but it's not supposed to work :-) */
 415 #ifdef CONFIG_NET_CLS_ACT
 416                 switch (result) {
 417                 case TC_ACT_QUEUED:
 418                 case TC_ACT_STOLEN:
 419                         kfree_skb(skb);
 420                         return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
 421                 case TC_ACT_SHOT:
 422                         kfree_skb(skb);
 423                         goto drop;
 424                 case TC_POLICE_RECLASSIFY:
 425                         if (flow->excess)
 426                                 flow = flow->excess;
 427                         else
 428                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
 429                         break;
 430                 }
 431 #endif
 432         }
 433
 434         ret = qdisc_enqueue(skb, flow->q);
 435         if (ret != 0) {
 436 drop: __maybe_unused
 437                 if (net_xmit_drop_count(ret)) {
 438                         sch->qstats.drops++;
 439                         if (flow)
 440                                 flow->qstats.drops++;
 441                 }
 442                 return ret;
 443         }
 444         sch->bstats.bytes += qdisc_pkt_len(skb);
 445         sch->bstats.packets++;
 446         flow->bstats.bytes += qdisc_pkt_len(skb);
 447         flow->bstats.packets++;
 448         /*
 449          * Okay, this may seem weird. We pretend we've dropped the packet if
 450          * it goes via ATM. The reason for this is that the outer qdisc
 451          * expects to be able to q->dequeue the packet later on if we return
 452          * success at this place. Also, sch->q.qdisc needs to reflect whether
 453          * there is a packet egligible for dequeuing or not. Note that the
 454          * statistics of the outer qdisc are necessarily wrong because of all
 455          * this. There's currently no correct solution for this.
 456          */
 457         if (flow == &p->link) {
 458                 sch->q.qlen++;
 459                 return 0;
 460         }
 461         tasklet_schedule(&p->task);
 462         return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 463 }
 464
 465 /*
 466  * Dequeue packets and send them over ATM. Note that we quite deliberately
 467  * avoid checking net_device's flow control here, simply because sch_atm
 468  * uses its own channels, which have nothing to do with any CLIP/LANE/or
 469  * non-ATM interfaces.
 470  */
 471
 472 static void sch_atm_dequeue(unsigned long data)
 473 {
 474         struct Qdisc *sch = (struct Qdisc *)data;
 475         struct atm_qdisc_data *p = qdisc_priv(sch);
 476         struct atm_flow_data *flow;
 477         struct sk_buff *skb;
 478
 479         pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
 480         for (flow = p->link.next; flow; flow = flow->next)
 481                 /*
 482                  * If traffic is properly shaped, this won't generate nasty
 483                  * little bursts. Otherwise, it may ... (but that's okay)
 484                  */
 485                 while ((skb = flow->q->ops->peek(flow->q))) {
 486                         if (!atm_may_send(flow->vcc, skb->truesize))
 487                                 break;
 488
 489                         skb = qdisc_dequeue_peeked(flow->q);
 490                         if (unlikely(!skb))
 491                                 break;
 492
 493                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 494                         /* remove any LL header somebody else has attached */
 495                         skb_pull(skb, skb_network_offset(skb));
 496                         if (skb_headroom(skb) < flow->hdr_len) {
 497                                 struct sk_buff *new;
 498
 499                                 new = skb_realloc_headroom(skb, flow->hdr_len);
 500                                 dev_kfree_skb(skb);
 501                                 if (!new)
 502                                         continue;
 503                                 skb = new;
 504                         }
 505                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
 506                                  skb_network_header(skb), skb->data);
 507                         ATM_SKB(skb)->vcc = flow->vcc;
 508                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 509                                flow->hdr_len);
 510                         atomic_add(skb->truesize,
 511                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 512                         /* atm.atm_options are already set by atm_tc_enqueue */
 513                         flow->vcc->send(flow->vcc, skb);
 514                 }
 515 }
 516
 517 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 518 {
 519         struct atm_qdisc_data *p = qdisc_priv(sch);
 520         struct sk_buff *skb;
 521
 522         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 523         tasklet_schedule(&p->task);
 524         skb = qdisc_dequeue_peeked(p->link.q);
 525         if (skb)
 526                 sch->q.qlen--;
 527         return skb;
 528 }
 529
 530 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
 531 {
 532         struct atm_qdisc_data *p = qdisc_priv(sch);
 533
 534         pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
 535
 536         return p->link.q->ops->peek(p->link.q);
 537 }
 538
 539 static unsigned int atm_tc_drop(struct Qdisc *sch)
 540 {
 541         struct atm_qdisc_data *p = qdisc_priv(sch);
 542         struct atm_flow_data *flow;
 543         unsigned int len;
 544
 545         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
 546         for (flow = p->flows; flow; flow = flow->next)
 547                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 548                         return len;
 549         return 0;
 550 }
 551
 552 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 553 {
 554         struct atm_qdisc_data *p = qdisc_priv(sch);
 555
 556         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 557         p->flows = &p->link;
 558         p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
 559                                       &pfifo_qdisc_ops, sch->handle);
 560         if (!p->link.q)
 561                 p->link.q = &noop_qdisc;
 562         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 563         p->link.filter_list = NULL;
 564         p->link.vcc = NULL;
 565         p->link.sock = NULL;
 566         p->link.classid = sch->handle;
 567         p->link.ref = 1;
 568         p->link.next = NULL;
 569         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
 570         return 0;
 571 }
 572
 573 static void atm_tc_reset(struct Qdisc *sch)
 574 {
 575         struct atm_qdisc_data *p = qdisc_priv(sch);
 576         struct atm_flow_data *flow;
 577
 578         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 579         for (flow = p->flows; flow; flow = flow->next)
 580                 qdisc_reset(flow->q);
 581         sch->q.qlen = 0;
 582 }
 583
 584 static void atm_tc_destroy(struct Qdisc *sch)
 585 {
 586         struct atm_qdisc_data *p = qdisc_priv(sch);
 587         struct atm_flow_data *flow;
 588
 589         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 590         for (flow = p->flows; flow; flow = flow->next)
 591                 tcf_destroy_chain(&flow->filter_list);
 592
 593         /* races ? */
 594         while ((flow = p->flows)) {
 595                 if (flow->ref > 1)
 596                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
 597                                flow->ref);
 598                 atm_tc_put(sch, (unsigned long)flow);
 599                 if (p->flows == flow) {
 600                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
 601                                "kill it\n", flow);
 602                         p->flows = flow->next;  /* brute force */
 603                         break;
 604                 }
 605         }
 606         tasklet_kill(&p->task);
 607 }
 608
 609 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 610                              struct sk_buff *skb, struct tcmsg *tcm)
 611 {
 612         struct atm_qdisc_data *p = qdisc_priv(sch);
 613         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 614         struct nlattr *nest;
 615
 616         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 617                 sch, p, flow, skb, tcm);
 618         if (!find_flow(p, flow))
 619                 return -EINVAL;
 620         tcm->tcm_handle = flow->classid;
 621         tcm->tcm_info = flow->q->handle;
 622
 623         nest = nla_nest_start(skb, TCA_OPTIONS);
 624         if (nest == NULL)
 625                 goto nla_put_failure;
 626
 627         NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
 628         if (flow->vcc) {
 629                 struct sockaddr_atmpvc pvc;
 630                 int state;
 631
 632                 pvc.sap_family = AF_ATMPVC;
 633                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 634                 pvc.sap_addr.vpi = flow->vcc->vpi;
 635                 pvc.sap_addr.vci = flow->vcc->vci;
 636                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
 637                 state = ATM_VF2VS(flow->vcc->flags);
 638                 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
 639         }
 640         if (flow->excess)
 641                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
 642         else {
 643                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
 644         }
 645
 646         nla_nest_end(skb, nest);
 647         return skb->len;
 648
 649 nla_put_failure:
 650         nla_nest_cancel(skb, nest);
 651         return -1;
 652 }
 653 static int
 654 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 655                         struct gnet_dump *d)
 656 {
 657         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 658
 659         flow->qstats.qlen = flow->q->q.qlen;
 660
 661         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 662             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 663                 return -1;
 664
 665         return 0;
 666 }
 667
 668 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 669 {
 670         return 0;
 671 }
 672
 673 static const struct Qdisc_class_ops atm_class_ops = {
 674         .graft          = atm_tc_graft,
 675         .leaf           = atm_tc_leaf,
 676         .get            = atm_tc_get,
 677         .put            = atm_tc_put,
 678         .change         = atm_tc_change,
 679         .delete         = atm_tc_delete,
 680         .walk           = atm_tc_walk,
 681         .tcf_chain      = atm_tc_find_tcf,
 682         .bind_tcf       = atm_tc_bind_filter,
 683         .unbind_tcf     = atm_tc_put,
 684         .dump           = atm_tc_dump_class,
 685         .dump_stats     = atm_tc_dump_class_stats,
 686 };
 687
 688 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 689         .cl_ops         = &atm_class_ops,
 690         .id             = "atm",
 691         .priv_size      = sizeof(struct atm_qdisc_data),
 692         .enqueue        = atm_tc_enqueue,
 693         .dequeue        = atm_tc_dequeue,
 694         .peek           = atm_tc_peek,
 695         .drop           = atm_tc_drop,
 696         .init           = atm_tc_init,
 697         .reset          = atm_tc_reset,
 698         .destroy        = atm_tc_destroy,
 699         .dump           = atm_tc_dump,
 700         .owner          = THIS_MODULE,
 701 };
 702
 703 static int __init atm_init(void)
 704 {
 705         return register_qdisc(&atm_qdisc_ops);
 706 }
 707
 708 static void __exit atm_exit(void)
 709 {
 710         unregister_qdisc(&atm_qdisc_ops);
 711 }
 712
 713 module_init(atm_init)
 714 module_exit(atm_exit)
 715 MODULE_LICENSE("GPL");