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
   6 #include <linux/module.h>
   7 #include <linux/init.h>
   8 #include <linux/string.h>
   9 #include <linux/errno.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/atmdev.h>
  13 #include <linux/atmclip.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/file.h> /* for fput */
  17 #include <net/netlink.h>
  18 #include <net/pkt_sched.h>
  19 #include <net/sock.h>
  20
  21
  22 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
  23
  24 #if 0 /* control */
  25 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  26 #else
  27 #define DPRINTK(format,args...)
  28 #endif
  29
  30 #if 0 /* data */
  31 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
  32 #else
  33 #define D2PRINTK(format,args...)
  34 #endif
  35
  36
  37 /*
  38  * The ATM queuing discipline provides a framework for invoking classifiers
  39  * (aka "filters"), which in turn select classes of this queuing discipline.
  40  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  41  * may share the same VC.
  42  *
  43  * When creating a class, VCs are specified by passing the number of the open
  44  * socket descriptor by which the calling process references the VC. The kernel
  45  * keeps the VC open at least until all classes using it are removed.
  46  *
  47  * In this file, most functions are named atm_tc_* to avoid confusion with all
  48  * the atm_* in net/atm. This naming convention differs from what's used in the
  49  * rest of net/sched.
  50  *
  51  * Known bugs:
  52  *  - sometimes messes up the IP stack
  53  *  - any manipulations besides the few operations described in the README, are
  54  *    untested and likely to crash the system
  55  *  - should lock the flow while there is data in the queue (?)
  56  */
  57
  58
  59 #define PRIV(sch) qdisc_priv(sch)
  60 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  61
  62
  63 struct atm_flow_data {
  64         struct Qdisc            *q;             /* FIFO, TBF, etc. */
  65         struct tcf_proto        *filter_list;
  66         struct atm_vcc          *vcc;           /* VCC; NULL if VCC is closed */
  67         void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
  68         struct atm_qdisc_data   *parent;        /* parent qdisc */
  69         struct socket           *sock;          /* for closing */
  70         u32                     classid;        /* x:y type ID */
  71         int                     ref;            /* reference count */
  72         struct gnet_stats_basic bstats;
  73         struct gnet_stats_queue qstats;
  74         spinlock_t              *stats_lock;
  75         struct atm_flow_data    *next;
  76         struct atm_flow_data    *excess;        /* flow for excess traffic;
  77                                                    NULL to set CLP instead */
  78         int                     hdr_len;
  79         unsigned char           hdr[0];         /* header data; MUST BE LAST */
  80 };
  81
  82 struct atm_qdisc_data {
  83         struct atm_flow_data    link;           /* unclassified skbs go here */
  84         struct atm_flow_data    *flows;         /* NB: "link" is also on this
  85                                                    list */
  86         struct tasklet_struct   task;           /* requeue tasklet */
  87 };
  88
  89
  90 /* ------------------------- Class/flow operations ------------------------- */
  91
  92
  93 static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
  94 {
  95         struct atm_flow_data *walk;
  96
  97         DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
  98         for (walk = qdisc->flows; walk; walk = walk->next)
  99                 if (walk == flow) return 1;
 100         DPRINTK("find_flow: not found\n");
 101         return 0;
 102 }
 103
 104
 105 static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
 106     u32 classid)
 107 {
 108         struct atm_qdisc_data *p = PRIV(sch);
 109         struct atm_flow_data *flow;
 110
 111         for (flow = p->flows; flow; flow = flow->next)
 112                 if (flow->classid == classid) break;
 113         return flow;
 114 }
 115
 116
 117 static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
 118     struct Qdisc *new,struct Qdisc **old)
 119 {
 120         struct atm_qdisc_data *p = PRIV(sch);
 121         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 122
 123         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
 124             p,flow,new,old);
 125         if (!find_flow(p,flow)) return -EINVAL;
 126         if (!new) new = &noop_qdisc;
 127         *old = xchg(&flow->q,new);
 128         if (*old) qdisc_reset(*old);
 129         return 0;
 130 }
 131
 132
 133 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
 134 {
 135         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 136
 137         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
 138         return flow ? flow->q : NULL;
 139 }
 140
 141
 142 static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
 143 {
 144         struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
 145         struct atm_flow_data *flow;
 146
 147         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
 148         flow = lookup_flow(sch,classid);
 149         if (flow) flow->ref++;
 150         DPRINTK("atm_tc_get: flow %p\n",flow);
 151         return (unsigned long) flow;
 152 }
 153
 154
 155 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 156     unsigned long parent, u32 classid)
 157 {
 158         return atm_tc_get(sch,classid);
 159 }
 160
 161 /*
 162  * atm_tc_put handles all destructions, including the ones that are explicitly
 163  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 164  * anything that still seems to be in use.
 165  */
 166
 167 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 168 {
 169         struct atm_qdisc_data *p = PRIV(sch);
 170         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 171         struct atm_flow_data **prev;
 172
 173         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 174         if (--flow->ref) return;
 175         DPRINTK("atm_tc_put: destroying\n");
 176         for (prev = &p->flows; *prev; prev = &(*prev)->next)
 177                 if (*prev == flow) break;
 178         if (!*prev) {
 179                 printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
 180                 return;
 181         }
 182         *prev = flow->next;
 183         DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
 184         qdisc_destroy(flow->q);
 185         tcf_destroy_chain(flow->filter_list);
 186         if (flow->sock) {
 187                 DPRINTK("atm_tc_put: f_count %d\n",
 188                     file_count(flow->sock->file));
 189                 flow->vcc->pop = flow->old_pop;
 190                 sockfd_put(flow->sock);
 191         }
 192         if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
 193         if (flow != &p->link) kfree(flow);
 194         /*
 195          * If flow == &p->link, the qdisc no longer works at this point and
 196          * needs to be removed. (By the caller of atm_tc_put.)
 197          */
 198 }
 199
 200
 201 static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
 202 {
 203         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 204
 205         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
 206         VCC2FLOW(vcc)->old_pop(vcc,skb);
 207         tasklet_schedule(&p->task);
 208 }
 209
 210 static const u8 llc_oui_ip[] = {
 211         0xaa,           /* DSAP: non-ISO */
 212         0xaa,           /* SSAP: non-ISO */
 213         0x03,           /* Ctrl: Unnumbered Information Command PDU */
 214         0x00,           /* OUI: EtherType */
 215         0x00, 0x00,
 216         0x08, 0x00 };   /* Ethertype IP (0800) */
 217
 218 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 219     struct rtattr **tca, unsigned long *arg)
 220 {
 221         struct atm_qdisc_data *p = PRIV(sch);
 222         struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
 223         struct atm_flow_data *excess = NULL;
 224         struct rtattr *opt = tca[TCA_OPTIONS-1];
 225         struct rtattr *tb[TCA_ATM_MAX];
 226         struct socket *sock;
 227         int fd,error,hdr_len;
 228         void *hdr;
 229
 230         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 231             "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
 232         /*
 233          * The concept of parents doesn't apply for this qdisc.
 234          */
 235         if (parent && parent != TC_H_ROOT && parent != sch->handle)
 236                 return -EINVAL;
 237         /*
 238          * ATM classes cannot be changed. In order to change properties of the
 239          * ATM connection, that socket needs to be modified directly (via the
 240          * native ATM API. In order to send a flow to a different VC, the old
 241          * class needs to be removed and a new one added. (This may be changed
 242          * later.)
 243          */
 244         if (flow) return -EBUSY;
 245         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
 246                 return -EINVAL;
 247         if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
 248                 return -EINVAL;
 249         fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
 250         DPRINTK("atm_tc_change: fd %d\n",fd);
 251         if (tb[TCA_ATM_HDR-1]) {
 252                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
 253                 hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
 254         }
 255         else {
 256                 hdr_len = RFC1483LLC_LEN;
 257                 hdr = NULL; /* default LLC/SNAP for IP */
 258         }
 259         if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
 260         else {
 261                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
 262                         return -EINVAL;
 263                 excess = (struct atm_flow_data *) atm_tc_get(sch,
 264                     *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
 265                 if (!excess) return -ENOENT;
 266         }
 267         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 268             opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
 269         if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
 270         DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
 271         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 272                 error = -EPROTOTYPE;
 273                 goto err_out;
 274         }
 275         /* @@@ should check if the socket is really operational or we'll crash
 276            on vcc->send */
 277         if (classid) {
 278                 if (TC_H_MAJ(classid ^ sch->handle)) {
 279                         DPRINTK("atm_tc_change: classid mismatch\n");
 280                         error = -EINVAL;
 281                         goto err_out;
 282                 }
 283                 if (find_flow(p,flow)) {
 284                         error = -EEXIST;
 285                         goto err_out;
 286                 }
 287         }
 288         else {
 289                 int i;
 290                 unsigned long cl;
 291
 292                 for (i = 1; i < 0x8000; i++) {
 293                         classid = TC_H_MAKE(sch->handle,0x8000 | i);
 294                         if (!(cl = atm_tc_get(sch,classid))) break;
 295                         atm_tc_put(sch,cl);
 296                 }
 297         }
 298         DPRINTK("atm_tc_change: new id %x\n",classid);
 299         flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
 300         DPRINTK("atm_tc_change: flow %p\n",flow);
 301         if (!flow) {
 302                 error = -ENOBUFS;
 303                 goto err_out;
 304         }
 305         memset(flow,0,sizeof(*flow));
 306         flow->filter_list = NULL;
 307         if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,classid)))
 308                 flow->q = &noop_qdisc;
 309         DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
 310         flow->sock = sock;
 311         flow->vcc = ATM_SD(sock); /* speedup */
 312         flow->vcc->user_back = flow;
 313         DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
 314         flow->old_pop = flow->vcc->pop;
 315         flow->parent = p;
 316         flow->vcc->pop = sch_atm_pop;
 317         flow->classid = classid;
 318         flow->ref = 1;
 319         flow->excess = excess;
 320         flow->next = p->link.next;
 321         p->link.next = flow;
 322         flow->hdr_len = hdr_len;
 323         if (hdr)
 324                 memcpy(flow->hdr,hdr,hdr_len);
 325         else
 326                 memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip));
 327         *arg = (unsigned long) flow;
 328         return 0;
 329 err_out:
 330         if (excess) atm_tc_put(sch,(unsigned long) excess);
 331         sockfd_put(sock);
 332         return error;
 333 }
 334
 335
 336 static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
 337 {
 338         struct atm_qdisc_data *p = PRIV(sch);
 339         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 340
 341         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 342         if (!find_flow(PRIV(sch),flow)) return -EINVAL;
 343         if (flow->filter_list || flow == &p->link) return -EBUSY;
 344         /*
 345          * Reference count must be 2: one for "keepalive" (set at class
 346          * creation), and one for the reference held when calling delete.
 347          */
 348         if (flow->ref < 2) {
 349                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
 350                 return -EINVAL;
 351         }
 352         if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
 353         atm_tc_put(sch,arg);
 354         return 0;
 355 }
 356
 357
 358 static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
 359 {
 360         struct atm_qdisc_data *p = PRIV(sch);
 361         struct atm_flow_data *flow;
 362
 363         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
 364         if (walker->stop) return;
 365         for (flow = p->flows; flow; flow = flow->next) {
 366                 if (walker->count >= walker->skip)
 367                         if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
 368                                 walker->stop = 1;
 369                                 break;
 370                         }
 371                 walker->count++;
 372         }
 373 }
 374
 375
 376 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
 377 {
 378         struct atm_qdisc_data *p = PRIV(sch);
 379         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 380
 381         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
 382         return flow ? &flow->filter_list : &p->link.filter_list;
 383 }
 384
 385
 386 /* --------------------------- Qdisc operations ---------------------------- */
 387
 388
 389 static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
 390 {
 391         struct atm_qdisc_data *p = PRIV(sch);
 392         struct atm_flow_data *flow = NULL ; /* @@@ */
 393         struct tcf_result res;
 394         int result;
 395         int ret = NET_XMIT_POLICED;
 396
 397         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
 398         result = TC_POLICE_OK; /* be nice to gcc */
 399         if (TC_H_MAJ(skb->priority) != sch->handle ||
 400             !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
 401                 for (flow = p->flows; flow; flow = flow->next)
 402                         if (flow->filter_list) {
 403                                 result = tc_classify(skb,flow->filter_list,
 404                                     &res);
 405                                 if (result < 0) continue;
 406                                 flow = (struct atm_flow_data *) res.class;
 407                                 if (!flow) flow = lookup_flow(sch,res.classid);
 408                                 break;
 409                         }
 410         if (!flow) 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_POLICE
 416                 switch (result) {
 417                         case TC_POLICE_SHOT:
 418                                 kfree_skb(skb);
 419                                 break;
 420                         case TC_POLICE_RECLASSIFY:
 421                                 if (flow->excess) flow = flow->excess;
 422                                 else {
 423                                         ATM_SKB(skb)->atm_options |=
 424                                             ATM_ATMOPT_CLP;
 425                                         break;
 426                                 }
 427                                 /* fall through */
 428                         case TC_POLICE_OK:
 429                                 /* fall through */
 430                         default:
 431                                 break;
 432                 }
 433 #endif
 434         }
 435         if (
 436 #ifdef CONFIG_NET_CLS_POLICE
 437             result == TC_POLICE_SHOT ||
 438 #endif
 439             (ret = flow->q->enqueue(skb,flow->q)) != 0) {
 440                 sch->qstats.drops++;
 441                 if (flow) 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 /*
 467  * Dequeue packets and send them over ATM. Note that we quite deliberately
 468  * avoid checking net_device's flow control here, simply because sch_atm
 469  * uses its own channels, which have nothing to do with any CLIP/LANE/or
 470  * non-ATM interfaces.
 471  */
 472
 473
 474 static void sch_atm_dequeue(unsigned long data)
 475 {
 476         struct Qdisc *sch = (struct Qdisc *) data;
 477         struct atm_qdisc_data *p = PRIV(sch);
 478         struct atm_flow_data *flow;
 479         struct sk_buff *skb;
 480
 481         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
 482         for (flow = p->link.next; flow; flow = flow->next)
 483                 /*
 484                  * If traffic is properly shaped, this won't generate nasty
 485                  * little bursts. Otherwise, it may ... (but that's okay)
 486                  */
 487                 while ((skb = flow->q->dequeue(flow->q))) {
 488                         if (!atm_may_send(flow->vcc,skb->truesize)) {
 489                                 (void) flow->q->ops->requeue(skb,flow->q);
 490                                 break;
 491                         }
 492                         D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow);
 493                         /* remove any LL header somebody else has attached */
 494                         skb_pull(skb, skb_network_offset(skb));
 495                         if (skb_headroom(skb) < flow->hdr_len) {
 496                                 struct sk_buff *new;
 497
 498                                 new = skb_realloc_headroom(skb,flow->hdr_len);
 499                                 dev_kfree_skb(skb);
 500                                 if (!new) continue;
 501                                 skb = new;
 502                         }
 503                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
 504                                  skb_network_header(skb), skb->data);
 505                         ATM_SKB(skb)->vcc = flow->vcc;
 506                         memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
 507                             flow->hdr_len);
 508                         atomic_add(skb->truesize,
 509                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 510                         /* atm.atm_options are already set by atm_tc_enqueue */
 511                         (void) flow->vcc->send(flow->vcc,skb);
 512                 }
 513 }
 514
 515
 516 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 517 {
 518         struct atm_qdisc_data *p = PRIV(sch);
 519         struct sk_buff *skb;
 520
 521         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
 522         tasklet_schedule(&p->task);
 523         skb = p->link.q->dequeue(p->link.q);
 524         if (skb) sch->q.qlen--;
 525         return skb;
 526 }
 527
 528
 529 static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
 530 {
 531         struct atm_qdisc_data *p = PRIV(sch);
 532         int ret;
 533
 534         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
 535         ret = p->link.q->ops->requeue(skb,p->link.q);
 536         if (!ret) {
 537         sch->q.qlen++;
 538         sch->qstats.requeues++;
 539     } else {
 540                 sch->qstats.drops++;
 541                 p->link.qstats.drops++;
 542         }
 543         return ret;
 544 }
 545
 546
 547 static unsigned int atm_tc_drop(struct Qdisc *sch)
 548 {
 549         struct atm_qdisc_data *p = PRIV(sch);
 550         struct atm_flow_data *flow;
 551         unsigned int len;
 552
 553         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
 554         for (flow = p->flows; flow; flow = flow->next)
 555                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 556                         return len;
 557         return 0;
 558 }
 559
 560
 561 static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
 562 {
 563         struct atm_qdisc_data *p = PRIV(sch);
 564
 565         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
 566         p->flows = &p->link;
 567         if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,
 568                                            sch->handle)))
 569                 p->link.q = &noop_qdisc;
 570         DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
 571         p->link.filter_list = NULL;
 572         p->link.vcc = NULL;
 573         p->link.sock = NULL;
 574         p->link.classid = sch->handle;
 575         p->link.ref = 1;
 576         p->link.next = NULL;
 577         tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
 578         return 0;
 579 }
 580
 581
 582 static void atm_tc_reset(struct Qdisc *sch)
 583 {
 584         struct atm_qdisc_data *p = PRIV(sch);
 585         struct atm_flow_data *flow;
 586
 587         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
 588         for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
 589         sch->q.qlen = 0;
 590 }
 591
 592
 593 static void atm_tc_destroy(struct Qdisc *sch)
 594 {
 595         struct atm_qdisc_data *p = PRIV(sch);
 596         struct atm_flow_data *flow;
 597
 598         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
 599         /* races ? */
 600         while ((flow = p->flows)) {
 601                 tcf_destroy_chain(flow->filter_list);
 602                 if (flow->ref > 1)
 603                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
 604                             flow->ref);
 605                 atm_tc_put(sch,(unsigned long) flow);
 606                 if (p->flows == flow) {
 607                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
 608                             "kill it\n",flow);
 609                         p->flows = flow->next; /* brute force */
 610                         break;
 611                 }
 612         }
 613         tasklet_kill(&p->task);
 614 }
 615
 616
 617 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 618     struct sk_buff *skb, struct tcmsg *tcm)
 619 {
 620         struct atm_qdisc_data *p = PRIV(sch);
 621         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
 622         unsigned char *b = skb_tail_pointer(skb);
 623         struct rtattr *rta;
 624
 625         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 626             sch,p,flow,skb,tcm);
 627         if (!find_flow(p,flow)) return -EINVAL;
 628         tcm->tcm_handle = flow->classid;
 629         tcm->tcm_info = flow->q->handle;
 630         rta = (struct rtattr *) b;
 631         RTA_PUT(skb,TCA_OPTIONS,0,NULL);
 632         RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
 633         if (flow->vcc) {
 634                 struct sockaddr_atmpvc pvc;
 635                 int state;
 636
 637                 pvc.sap_family = AF_ATMPVC;
 638                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 639                 pvc.sap_addr.vpi = flow->vcc->vpi;
 640                 pvc.sap_addr.vci = flow->vcc->vci;
 641                 RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
 642                 state = ATM_VF2VS(flow->vcc->flags);
 643                 RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
 644         }
 645         if (flow->excess)
 646                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
 647         else {
 648                 static u32 zero;
 649
 650                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
 651         }
 652         rta->rta_len = skb_tail_pointer(skb) - b;
 653         return skb->len;
 654
 655 rtattr_failure:
 656         nlmsg_trim(skb, b);
 657         return -1;
 658 }
 659 static int
 660 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 661         struct gnet_dump *d)
 662 {
 663         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
 664
 665         flow->qstats.qlen = flow->q->q.qlen;
 666
 667         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 668             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 669                 return -1;
 670
 671         return 0;
 672 }
 673
 674 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 675 {
 676         return 0;
 677 }
 678
 679 static struct Qdisc_class_ops atm_class_ops = {
 680         .graft          =       atm_tc_graft,
 681         .leaf           =       atm_tc_leaf,
 682         .get            =       atm_tc_get,
 683         .put            =       atm_tc_put,
 684         .change         =       atm_tc_change,
 685         .delete         =       atm_tc_delete,
 686         .walk           =       atm_tc_walk,
 687         .tcf_chain      =       atm_tc_find_tcf,
 688         .bind_tcf       =       atm_tc_bind_filter,
 689         .unbind_tcf     =       atm_tc_put,
 690         .dump           =       atm_tc_dump_class,
 691         .dump_stats     =       atm_tc_dump_class_stats,
 692 };
 693
 694 static struct Qdisc_ops atm_qdisc_ops = {
 695         .next           =       NULL,
 696         .cl_ops         =       &atm_class_ops,
 697         .id             =       "atm",
 698         .priv_size      =       sizeof(struct atm_qdisc_data),
 699         .enqueue        =       atm_tc_enqueue,
 700         .dequeue        =       atm_tc_dequeue,
 701         .requeue        =       atm_tc_requeue,
 702         .drop           =       atm_tc_drop,
 703         .init           =       atm_tc_init,
 704         .reset          =       atm_tc_reset,
 705         .destroy        =       atm_tc_destroy,
 706         .change         =       NULL,
 707         .dump           =       atm_tc_dump,
 708         .owner          =       THIS_MODULE,
 709 };
 710
 711
 712 static int __init atm_init(void)
 713 {
 714         return register_qdisc(&atm_qdisc_ops);
 715 }
 716
 717 static void __exit atm_exit(void)
 718 {
 719         unregister_qdisc(&atm_qdisc_ops);
 720 }
 721
 722 module_init(atm_init)
 723 module_exit(atm_exit)
 724 MODULE_LICENSE("GPL");