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   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/init.h>
   7 #include <linux/string.h>
   8 #include <linux/errno.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/atmdev.h>
  11 #include <linux/atmclip.h>
  12 #include <linux/rtnetlink.h>
  13 #include <linux/file.h>         /* for fput */
  14 #include <net/netlink.h>
  15 #include <net/pkt_sched.h>
  16
  17 extern struct socket *sockfd_lookup(int fd, int *err);  /* @@@ fix this */
  18
  19 #if 0 /* control */
  20 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  21 #else
  22 #define DPRINTK(format,args...)
  23 #endif
  24
  25 #if 0 /* data */
  26 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
  27 #else
  28 #define D2PRINTK(format,args...)
  29 #endif
  30
  31 /*
  32  * The ATM queuing discipline provides a framework for invoking classifiers
  33  * (aka "filters"), which in turn select classes of this queuing discipline.
  34  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  35  * may share the same VC.
  36  *
  37  * When creating a class, VCs are specified by passing the number of the open
  38  * socket descriptor by which the calling process references the VC. The kernel
  39  * keeps the VC open at least until all classes using it are removed.
  40  *
  41  * In this file, most functions are named atm_tc_* to avoid confusion with all
  42  * the atm_* in net/atm. This naming convention differs from what's used in the
  43  * rest of net/sched.
  44  *
  45  * Known bugs:
  46  *  - sometimes messes up the IP stack
  47  *  - any manipulations besides the few operations described in the README, are
  48  *    untested and likely to crash the system
  49  *  - should lock the flow while there is data in the queue (?)
  50  */
  51
  52 #define PRIV(sch) qdisc_priv(sch)
  53 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  54
  55 struct atm_flow_data {
  56         struct Qdisc            *q;     /* FIFO, TBF, etc. */
  57         struct tcf_proto        *filter_list;
  58         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
  59         void                    (*old_pop)(struct atm_vcc *vcc,
  60                                            struct sk_buff * skb); /* chaining */
  61         struct atm_qdisc_data   *parent;        /* parent qdisc */
  62         struct socket           *sock;          /* for closing */
  63         u32                     classid;        /* x:y type ID */
  64         int                     ref;            /* reference count */
  65         struct gnet_stats_basic bstats;
  66         struct gnet_stats_queue qstats;
  67         struct atm_flow_data    *next;
  68         struct atm_flow_data    *excess;        /* flow for excess traffic;
  69                                                    NULL to set CLP instead */
  70         int                     hdr_len;
  71         unsigned char           hdr[0];         /* header data; MUST BE LAST */
  72 };
  73
  74 struct atm_qdisc_data {
  75         struct atm_flow_data    link;           /* unclassified skbs go here */
  76         struct atm_flow_data    *flows;         /* NB: "link" is also on this
  77                                                    list */
  78         struct tasklet_struct   task;           /* requeue tasklet */
  79 };
  80
  81 /* ------------------------- Class/flow operations ------------------------- */
  82
  83 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
  84 {
  85         struct atm_flow_data *walk;
  86
  87         DPRINTK("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
  88         for (walk = qdisc->flows; walk; walk = walk->next)
  89                 if (walk == flow)
  90                         return 1;
  91         DPRINTK("find_flow: not found\n");
  92         return 0;
  93 }
  94
  95 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
  96 {
  97         struct atm_qdisc_data *p = PRIV(sch);
  98         struct atm_flow_data *flow;
  99
 100         for (flow = p->flows; flow; flow = flow->next)
 101                 if (flow->classid == classid)
 102                         break;
 103         return flow;
 104 }
 105
 106 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
 107                         struct Qdisc *new, struct Qdisc **old)
 108 {
 109         struct atm_qdisc_data *p = PRIV(sch);
 110         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 111
 112         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
 113                 sch, p, flow, new, old);
 114         if (!find_flow(p, flow))
 115                 return -EINVAL;
 116         if (!new)
 117                 new = &noop_qdisc;
 118         *old = xchg(&flow->q, new);
 119         if (*old)
 120                 qdisc_reset(*old);
 121         return 0;
 122 }
 123
 124 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
 125 {
 126         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 127
 128         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
 129         return flow ? flow->q : NULL;
 130 }
 131
 132 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
 133 {
 134         struct atm_qdisc_data *p __maybe_unused = PRIV(sch);
 135         struct atm_flow_data *flow;
 136
 137         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
 138         flow = lookup_flow(sch, classid);
 139         if (flow)
 140                 flow->ref++;
 141         DPRINTK("atm_tc_get: flow %p\n", flow);
 142         return (unsigned long)flow;
 143 }
 144
 145 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 146                                         unsigned long parent, u32 classid)
 147 {
 148         return atm_tc_get(sch, classid);
 149 }
 150
 151 /*
 152  * atm_tc_put handles all destructions, including the ones that are explicitly
 153  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 154  * anything that still seems to be in use.
 155  */
 156 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 157 {
 158         struct atm_qdisc_data *p = PRIV(sch);
 159         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 160         struct atm_flow_data **prev;
 161
 162         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 163         if (--flow->ref)
 164                 return;
 165         DPRINTK("atm_tc_put: destroying\n");
 166         for (prev = &p->flows; *prev; prev = &(*prev)->next)
 167                 if (*prev == flow)
 168                         break;
 169         if (!*prev) {
 170                 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
 171                 return;
 172         }
 173         *prev = flow->next;
 174         DPRINTK("atm_tc_put: qdisc %p\n", flow->q);
 175         qdisc_destroy(flow->q);
 176         tcf_destroy_chain(flow->filter_list);
 177         if (flow->sock) {
 178                 DPRINTK("atm_tc_put: f_count %d\n",
 179                         file_count(flow->sock->file));
 180                 flow->vcc->pop = flow->old_pop;
 181                 sockfd_put(flow->sock);
 182         }
 183         if (flow->excess)
 184                 atm_tc_put(sch, (unsigned long)flow->excess);
 185         if (flow != &p->link)
 186                 kfree(flow);
 187         /*
 188          * If flow == &p->link, the qdisc no longer works at this point and
 189          * needs to be removed. (By the caller of atm_tc_put.)
 190          */
 191 }
 192
 193 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 194 {
 195         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 196
 197         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
 198         VCC2FLOW(vcc)->old_pop(vcc, skb);
 199         tasklet_schedule(&p->task);
 200 }
 201
 202 static const u8 llc_oui_ip[] = {
 203         0xaa,                   /* DSAP: non-ISO */
 204         0xaa,                   /* SSAP: non-ISO */
 205         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
 206         0x00,                   /* OUI: EtherType */
 207         0x00, 0x00,
 208         0x08, 0x00
 209 };                              /* Ethertype IP (0800) */
 210
 211 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 212                          struct rtattr **tca, unsigned long *arg)
 213 {
 214         struct atm_qdisc_data *p = PRIV(sch);
 215         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
 216         struct atm_flow_data *excess = NULL;
 217         struct rtattr *opt = tca[TCA_OPTIONS - 1];
 218         struct rtattr *tb[TCA_ATM_MAX];
 219         struct socket *sock;
 220         int fd, error, hdr_len;
 221         void *hdr;
 222
 223         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 224                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
 225         /*
 226          * The concept of parents doesn't apply for this qdisc.
 227          */
 228         if (parent && parent != TC_H_ROOT && parent != sch->handle)
 229                 return -EINVAL;
 230         /*
 231          * ATM classes cannot be changed. In order to change properties of the
 232          * ATM connection, that socket needs to be modified directly (via the
 233          * native ATM API. In order to send a flow to a different VC, the old
 234          * class needs to be removed and a new one added. (This may be changed
 235          * later.)
 236          */
 237         if (flow)
 238                 return -EBUSY;
 239         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
 240                 return -EINVAL;
 241         if (!tb[TCA_ATM_FD - 1] || RTA_PAYLOAD(tb[TCA_ATM_FD - 1]) < sizeof(fd))
 242                 return -EINVAL;
 243         fd = *(int *)RTA_DATA(tb[TCA_ATM_FD - 1]);
 244         DPRINTK("atm_tc_change: fd %d\n", fd);
 245         if (tb[TCA_ATM_HDR - 1]) {
 246                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR - 1]);
 247                 hdr = RTA_DATA(tb[TCA_ATM_HDR - 1]);
 248         } else {
 249                 hdr_len = RFC1483LLC_LEN;
 250                 hdr = NULL;     /* default LLC/SNAP for IP */
 251         }
 252         if (!tb[TCA_ATM_EXCESS - 1])
 253                 excess = NULL;
 254         else {
 255                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS - 1]) != sizeof(u32))
 256                         return -EINVAL;
 257                 excess = (struct atm_flow_data *)
 258                         atm_tc_get(sch, *(u32 *)RTA_DATA(tb[TCA_ATM_EXCESS - 1]));
 259                 if (!excess)
 260                         return -ENOENT;
 261         }
 262         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 263                 opt->rta_type, RTA_PAYLOAD(opt), hdr_len);
 264         if (!(sock = sockfd_lookup(fd, &error)))
 265                 return error;   /* f_count++ */
 266         DPRINTK("atm_tc_change: f_count %d\n", file_count(sock->file));
 267         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 268                 error = -EPROTOTYPE;
 269                 goto err_out;
 270         }
 271         /* @@@ should check if the socket is really operational or we'll crash
 272            on vcc->send */
 273         if (classid) {
 274                 if (TC_H_MAJ(classid ^ sch->handle)) {
 275                         DPRINTK("atm_tc_change: classid mismatch\n");
 276                         error = -EINVAL;
 277                         goto err_out;
 278                 }
 279                 if (find_flow(p, flow)) {
 280                         error = -EEXIST;
 281                         goto err_out;
 282                 }
 283         } else {
 284                 int i;
 285                 unsigned long cl;
 286
 287                 for (i = 1; i < 0x8000; i++) {
 288                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
 289                         if (!(cl = atm_tc_get(sch, classid)))
 290                                 break;
 291                         atm_tc_put(sch, cl);
 292                 }
 293         }
 294         DPRINTK("atm_tc_change: new id %x\n", classid);
 295         flow = kmalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
 296         DPRINTK("atm_tc_change: flow %p\n", flow);
 297         if (!flow) {
 298                 error = -ENOBUFS;
 299                 goto err_out;
 300         }
 301         memset(flow, 0, sizeof(*flow));
 302         flow->filter_list = NULL;
 303         if (!(flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid)))
 304                 flow->q = &noop_qdisc;
 305         DPRINTK("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         DPRINTK("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 = PRIV(sch);
 335         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 336
 337         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 338         if (!find_flow(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 = PRIV(sch);
 359         struct atm_flow_data *flow;
 360
 361         DPRINTK("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 = PRIV(sch);
 377         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 378
 379         DPRINTK("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 = 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         D2PRINTK("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(skb, flow->filter_list,
 400                                                      &res);
 401                                 if (result < 0)
 402                                         continue;
 403                                 flow = (struct atm_flow_data *)res.class;
 404                                 if (!flow)
 405                                         flow = lookup_flow(sch, res.classid);
 406                                 break;
 407                         }
 408         if (!flow)
 409                 flow = &p->link;
 410         else {
 411                 if (flow->vcc)
 412                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 413                 /*@@@ looks good ... but it's not supposed to work :-) */
 414 #ifdef CONFIG_NET_CLS_POLICE
 415                 switch (result) {
 416                 case TC_POLICE_SHOT:
 417                         kfree_skb(skb);
 418                         break;
 419                 case TC_POLICE_RECLASSIFY:
 420                         if (flow->excess)
 421                                 flow = flow->excess;
 422                         else {
 423                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
 424                                 break;
 425                         }
 426                         /* fall through */
 427                 case TC_POLICE_OK:
 428                         /* fall through */
 429                 default:
 430                         break;
 431                 }
 432 #endif
 433         }
 434         if (
 435 #ifdef CONFIG_NET_CLS_POLICE
 436                    result == TC_POLICE_SHOT ||
 437 #endif
 438                    (ret = flow->q->enqueue(skb, flow->q)) != 0) {
 439                 sch->qstats.drops++;
 440                 if (flow)
 441                         flow->qstats.drops++;
 442                 return ret;
 443         }
 444         sch->bstats.bytes += skb->len;
 445         sch->bstats.packets++;
 446         flow->bstats.bytes += skb->len;
 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_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 = PRIV(sch);
 476         struct atm_flow_data *flow;
 477         struct sk_buff *skb;
 478
 479         D2PRINTK("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->dequeue(flow->q))) {
 486                         if (!atm_may_send(flow->vcc, skb->truesize)) {
 487                                 (void)flow->q->ops->requeue(skb, flow->q);
 488                                 break;
 489                         }
 490                         D2PRINTK("atm_tc_dequeue: sending on class %p\n", flow);
 491                         /* remove any LL header somebody else has attached */
 492                         skb_pull(skb, skb_network_offset(skb));
 493                         if (skb_headroom(skb) < flow->hdr_len) {
 494                                 struct sk_buff *new;
 495
 496                                 new = skb_realloc_headroom(skb, flow->hdr_len);
 497                                 dev_kfree_skb(skb);
 498                                 if (!new)
 499                                         continue;
 500                                 skb = new;
 501                         }
 502                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
 503                                  skb_network_header(skb), skb->data);
 504                         ATM_SKB(skb)->vcc = flow->vcc;
 505                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 506                                flow->hdr_len);
 507                         atomic_add(skb->truesize,
 508                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 509                         /* atm.atm_options are already set by atm_tc_enqueue */
 510                         flow->vcc->send(flow->vcc, skb);
 511                 }
 512 }
 513
 514 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 515 {
 516         struct atm_qdisc_data *p = PRIV(sch);
 517         struct sk_buff *skb;
 518
 519         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 520         tasklet_schedule(&p->task);
 521         skb = p->link.q->dequeue(p->link.q);
 522         if (skb)
 523                 sch->q.qlen--;
 524         return skb;
 525 }
 526
 527 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
 528 {
 529         struct atm_qdisc_data *p = PRIV(sch);
 530         int ret;
 531
 532         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 533         ret = p->link.q->ops->requeue(skb, p->link.q);
 534         if (!ret) {
 535                 sch->q.qlen++;
 536                 sch->qstats.requeues++;
 537         } else {
 538                 sch->qstats.drops++;
 539                 p->link.qstats.drops++;
 540         }
 541         return ret;
 542 }
 543
 544 static unsigned int atm_tc_drop(struct Qdisc *sch)
 545 {
 546         struct atm_qdisc_data *p = PRIV(sch);
 547         struct atm_flow_data *flow;
 548         unsigned int len;
 549
 550         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
 551         for (flow = p->flows; flow; flow = flow->next)
 552                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 553                         return len;
 554         return 0;
 555 }
 556
 557 static int atm_tc_init(struct Qdisc *sch, struct rtattr *opt)
 558 {
 559         struct atm_qdisc_data *p = PRIV(sch);
 560
 561         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 562         p->flows = &p->link;
 563         if (!(p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
 564                                             sch->handle)))
 565                 p->link.q = &noop_qdisc;
 566         DPRINTK("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 567         p->link.filter_list = NULL;
 568         p->link.vcc = NULL;
 569         p->link.sock = NULL;
 570         p->link.classid = sch->handle;
 571         p->link.ref = 1;
 572         p->link.next = NULL;
 573         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
 574         return 0;
 575 }
 576
 577 static void atm_tc_reset(struct Qdisc *sch)
 578 {
 579         struct atm_qdisc_data *p = PRIV(sch);
 580         struct atm_flow_data *flow;
 581
 582         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 583         for (flow = p->flows; flow; flow = flow->next)
 584                 qdisc_reset(flow->q);
 585         sch->q.qlen = 0;
 586 }
 587
 588 static void atm_tc_destroy(struct Qdisc *sch)
 589 {
 590         struct atm_qdisc_data *p = PRIV(sch);
 591         struct atm_flow_data *flow;
 592
 593         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 594         /* races ? */
 595         while ((flow = p->flows)) {
 596                 tcf_destroy_chain(flow->filter_list);
 597                 flow->filter_list = NULL;
 598                 if (flow->ref > 1)
 599                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
 600                                flow->ref);
 601                 atm_tc_put(sch, (unsigned long)flow);
 602                 if (p->flows == flow) {
 603                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
 604                                "kill it\n", flow);
 605                         p->flows = flow->next;  /* brute force */
 606                         break;
 607                 }
 608         }
 609         tasklet_kill(&p->task);
 610 }
 611
 612 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 613                              struct sk_buff *skb, struct tcmsg *tcm)
 614 {
 615         struct atm_qdisc_data *p = PRIV(sch);
 616         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 617         unsigned char *b = skb_tail_pointer(skb);
 618         struct rtattr *rta;
 619
 620         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 621                 sch, p, flow, skb, tcm);
 622         if (!find_flow(p, flow))
 623                 return -EINVAL;
 624         tcm->tcm_handle = flow->classid;
 625         tcm->tcm_info = flow->q->handle;
 626         rta = (struct rtattr *)b;
 627         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
 628         RTA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
 629         if (flow->vcc) {
 630                 struct sockaddr_atmpvc pvc;
 631                 int state;
 632
 633                 pvc.sap_family = AF_ATMPVC;
 634                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 635                 pvc.sap_addr.vpi = flow->vcc->vpi;
 636                 pvc.sap_addr.vci = flow->vcc->vci;
 637                 RTA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
 638                 state = ATM_VF2VS(flow->vcc->flags);
 639                 RTA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state);
 640         }
 641         if (flow->excess)
 642                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid);
 643         else {
 644                 static u32 zero;
 645
 646                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero);
 647         }
 648         rta->rta_len = skb_tail_pointer(skb) - b;
 649         return skb->len;
 650
 651 rtattr_failure:
 652         nlmsg_trim(skb, b);
 653         return -1;
 654 }
 655 static int
 656 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 657                         struct gnet_dump *d)
 658 {
 659         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 660
 661         flow->qstats.qlen = flow->q->q.qlen;
 662
 663         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 664             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 665                 return -1;
 666
 667         return 0;
 668 }
 669
 670 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 671 {
 672         return 0;
 673 }
 674
 675 static struct Qdisc_class_ops atm_class_ops = {
 676         .graft          = atm_tc_graft,
 677         .leaf           = atm_tc_leaf,
 678         .get            = atm_tc_get,
 679         .put            = atm_tc_put,
 680         .change         = atm_tc_change,
 681         .delete         = atm_tc_delete,
 682         .walk           = atm_tc_walk,
 683         .tcf_chain      = atm_tc_find_tcf,
 684         .bind_tcf       = atm_tc_bind_filter,
 685         .unbind_tcf     = atm_tc_put,
 686         .dump           = atm_tc_dump_class,
 687         .dump_stats     = atm_tc_dump_class_stats,
 688 };
 689
 690 static struct Qdisc_ops atm_qdisc_ops = {
 691         .cl_ops         = &atm_class_ops,
 692         .id             = "atm",
 693         .priv_size      = sizeof(struct atm_qdisc_data),
 694         .enqueue        = atm_tc_enqueue,
 695         .dequeue        = atm_tc_dequeue,
 696         .requeue        = atm_tc_requeue,
 697         .drop           = atm_tc_drop,
 698         .init           = atm_tc_init,
 699         .reset          = atm_tc_reset,
 700         .destroy        = atm_tc_destroy,
 701         .dump           = atm_tc_dump,
 702         .owner          = THIS_MODULE,
 703 };
 704
 705 static int __init atm_init(void)
 706 {
 707         return register_qdisc(&atm_qdisc_ops);
 708 }
 709
 710 static void __exit atm_exit(void)
 711 {
 712         unregister_qdisc(&atm_qdisc_ops);
 713 }
 714
 715 module_init(atm_init)
 716 module_exit(atm_exit)
 717 MODULE_LICENSE("GPL");