1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6 #include <linux/config.h>
7 #include <linux/string.h>
8 #include <linux/errno.h>
9 #include <linux/kernel.h> /* for UINT_MAX */
10 #include <linux/netdevice.h>
11 #include <linux/skbuff.h>
12 #include <linux/wait.h>
13 #include <linux/timer.h>
14 #include <linux/if_arp.h> /* for some manifest constants */
15 #include <linux/notifier.h>
16 #include <linux/atm.h>
17 #include <linux/atmdev.h>
18 #include <linux/atmclip.h>
19 #include <linux/atmarp.h>
20 #include <linux/ip.h> /* for net/route.h */
21 #include <linux/in.h> /* for struct sockaddr_in */
22 #include <linux/if.h> /* for IFF_UP */
23 #include <linux/inetdevice.h>
24 #include <linux/bitops.h>
25 #include <net/route.h> /* for struct rtable and routing */
26 #include <net/icmp.h> /* icmp_send */
27 #include <asm/param.h> /* for HZ */
28 #include <asm/byteorder.h> /* for htons etc. */
29 #include <asm/system.h> /* save/restore_flags */
30 #include <asm/uaccess.h>
31 #include <asm/atomic.h>
32
33 #include "common.h"
34 #include "resources.h"
35 #include "ipcommon.h"
36 #include <net/atmclip.h>
37
38
39 #if 0
40 #define DPRINTK(format,args...) printk(format,##args)
41 #else
42 #define DPRINTK(format,args...)
43 #endif
44
45
46 struct net_device *clip_devs = NULL;
47 struct atm_vcc *atmarpd = NULL;
48 static struct timer_list idle_timer;
49 static int start_timer = 1;
50
51
52 static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
53 {
54 struct atmarp_ctrl *ctrl;
55 struct sk_buff *skb;
56
57 DPRINTK("to_atmarpd(%d)\n",type);
58 if (!atmarpd) return -EUNATCH;
59 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
60 if (!skb) return -ENOMEM;
61 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
62 ctrl->type = type;
63 ctrl->itf_num = itf;
64 ctrl->ip = ip;
65 atm_force_charge(atmarpd,skb->truesize);
66 skb_queue_tail(&atmarpd->recvq,skb);
67 wake_up(&atmarpd->sleep);
68 return 0;
69 }
70
71
72 static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
73 {
74 DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
75 entry->neigh);
76 clip_vcc->entry = entry;
77 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
78 clip_vcc->next = entry->vccs;
79 entry->vccs = clip_vcc;
80 entry->neigh->used = jiffies;
81 }
82
83
84 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
85 {
86 struct atmarp_entry *entry = clip_vcc->entry;
87 struct clip_vcc **walk;
88
89 if (!entry) {
90 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
91 return;
92 }
93 entry->neigh->used = jiffies;
94 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
95 if (*walk == clip_vcc) {
96 int error;
97
98 *walk = clip_vcc->next; /* atomic */
99 clip_vcc->entry = NULL;
100 if (clip_vcc->xoff)
101 netif_wake_queue(entry->neigh->dev);
102 if (entry->vccs) return;
103 entry->expires = jiffies-1;
104 /* force resolution or expiration */
105 error = neigh_update(entry->neigh,NULL,NUD_NONE,0,0);
106 if (error)
107 printk(KERN_CRIT "unlink_clip_vcc: "
108 "neigh_update failed with %d\n",error);
109 return;
110 }
111 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
112 "0x%p)\n",entry,clip_vcc);
113 }
114
115
116 static void idle_timer_check(unsigned long dummy)
117 {
118 int i;
119
120 /*DPRINTK("idle_timer_check\n");*/
121 write_lock(&clip_tbl.lock);
122 for (i = 0; i <= NEIGH_HASHMASK; i++) {
123 struct neighbour **np;
124
125 for (np = &clip_tbl.hash_buckets[i]; *np;) {
126 struct neighbour *n = *np;
127 struct atmarp_entry *entry = NEIGH2ENTRY(n);
128 struct clip_vcc *clip_vcc;
129
130 for (clip_vcc = entry->vccs; clip_vcc;
131 clip_vcc = clip_vcc->next)
132 if (clip_vcc->idle_timeout &&
133 time_after(jiffies, clip_vcc->last_use+
134 clip_vcc->idle_timeout)) {
135 DPRINTK("releasing vcc %p->%p of "
136 "entry %p\n",clip_vcc,clip_vcc->vcc,
137 entry);
138 atm_async_release_vcc(clip_vcc->vcc,
139 -ETIMEDOUT);
140 }
141 if (entry->vccs ||
142 time_before(jiffies, entry->expires)) {
143 np = &n->next;
144 continue;
145 }
146 if (atomic_read(&n->refcnt) > 1) {
147 struct sk_buff *skb;
148
149 DPRINTK("destruction postponed with ref %d\n",
150 atomic_read(&n->refcnt));
151 while ((skb = skb_dequeue(&n->arp_queue)) !=
152 NULL)
153 dev_kfree_skb(skb);
154 np = &n->next;
155 continue;
156 }
157 *np = n->next;
158 DPRINTK("expired neigh %p\n",n);
159 n->dead = 1;
160 neigh_release(n);
161 }
162 }
163 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
164 write_unlock(&clip_tbl.lock);
165 }
166
167
168 static int clip_arp_rcv(struct sk_buff *skb)
169 {
170 struct atm_vcc *vcc;
171
172 DPRINTK("clip_arp_rcv\n");
173 vcc = ATM_SKB(skb)->vcc;
174 if (!vcc || !atm_charge(vcc,skb->truesize)) {
175 dev_kfree_skb_any(skb);
176 return 0;
177 }
178 DPRINTK("pushing to %p\n",vcc);
179 DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
180 CLIP_VCC(vcc)->old_push(vcc,skb);
181 return 0;
182 }
183
184
185 void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
186 {
187 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
188
189 DPRINTK("clip push\n");
190 if (!skb) {
191 DPRINTK("removing VCC %p\n",clip_vcc);
192 if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
193 clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
194 kfree(clip_vcc);
195 return;
196 }
197 atm_return(vcc,skb->truesize);
198 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
199 /* clip_vcc->entry == NULL if we don't have an IP address yet */
200 if (!skb->dev) {
201 dev_kfree_skb_any(skb);
202 return;
203 }
204 ATM_SKB(skb)->vcc = vcc;
205 skb->mac.raw = skb->data;
206 if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
207 llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
208 else {
209 skb->protocol = ((u16 *) skb->data)[3];
210 skb_pull(skb,RFC1483LLC_LEN);
211 if (skb->protocol == htons(ETH_P_ARP)) {
212 PRIV(skb->dev)->stats.rx_packets++;
213 PRIV(skb->dev)->stats.rx_bytes += skb->len;
214 clip_arp_rcv(skb);
215 return;
216 }
217 }
218 clip_vcc->last_use = jiffies;
219 PRIV(skb->dev)->stats.rx_packets++;
220 PRIV(skb->dev)->stats.rx_bytes += skb->len;
221 netif_rx(skb);
222 }
223
224
225 /*
226 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
227 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
228 */
229
230
231 static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
232 {
233 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
234 struct net_device *dev = skb->dev;
235 int old;
236 unsigned long flags;
237
238 DPRINTK("clip_pop(vcc %p)\n",vcc);
239 clip_vcc->old_pop(vcc,skb);
240 /* skb->dev == NULL in outbound ARP packets */
241 if (!dev) return;
242 spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
243 if (atm_may_send(vcc,0)) {
244 old = xchg(&clip_vcc->xoff,0);
245 if (old) netif_wake_queue(dev);
246 }
247 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
248 }
249
250
251 static void clip_neigh_destroy(struct neighbour *neigh)
252 {
253 DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
254 if (NEIGH2ENTRY(neigh)->vccs)
255 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
256 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
257 }
258
259
260 static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
261 {
262 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
263 to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
264 }
265
266
267 static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
268 {
269 #ifndef CONFIG_ATM_CLIP_NO_ICMP
270 icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
271 #endif
272 kfree_skb(skb);
273 }
274
275
276 static struct neigh_ops clip_neigh_ops = {
277 family: AF_INET,
278 destructor: clip_neigh_destroy,
279 solicit: clip_neigh_solicit,
280 error_report: clip_neigh_error,
281 output: dev_queue_xmit,
282 connected_output: dev_queue_xmit,
283 hh_output: dev_queue_xmit,
284 queue_xmit: dev_queue_xmit,
285 };
286
287
288 static int clip_constructor(struct neighbour *neigh)
289 {
290 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
291 struct net_device *dev = neigh->dev;
292 struct in_device *in_dev = dev->ip_ptr;
293
294 DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
295 if (!in_dev) return -EINVAL;
296 neigh->type = inet_addr_type(entry->ip);
297 if (neigh->type != RTN_UNICAST) return -EINVAL;
298 if (in_dev->arp_parms) neigh->parms = in_dev->arp_parms;
299 neigh->ops = &clip_neigh_ops;
300 neigh->output = neigh->nud_state & NUD_VALID ?
301 neigh->ops->connected_output : neigh->ops->output;
302 entry->neigh = neigh;
303 entry->vccs = NULL;
304 entry->expires = jiffies-1;
305 return 0;
306 }
307
308 static u32 clip_hash(const void *pkey, const struct net_device *dev)
309 {
310 u32 hash_val;
311
312 hash_val = *(u32*)pkey;
313 hash_val ^= (hash_val>>16);
314 hash_val ^= hash_val>>8;
315 hash_val ^= hash_val>>3;
316 hash_val = (hash_val^dev->ifindex)&NEIGH_HASHMASK;
317
318 return hash_val;
319 }
320
321
322 struct neigh_table clip_tbl = {
323 NULL, /* next */
324 AF_INET, /* family */
325 sizeof(struct neighbour)+sizeof(struct atmarp_entry), /* entry_size */
326 4, /* key_len */
327 clip_hash,
328 clip_constructor, /* constructor */
329 NULL, /* pconstructor */
330 NULL, /* pdestructor */
331 NULL, /* proxy_redo */
332 "clip_arp_cache",
333 { /* neigh_parms */
334 NULL, /* next */
335 NULL, /* neigh_setup */
336 &clip_tbl, /* tbl */
337 0, /* entries */
338 NULL, /* priv */
339 NULL, /* sysctl_table */
340 30*HZ, /* base_reachable_time */
341 1*HZ, /* retrans_time */
342 60*HZ, /* gc_staletime */
343 30*HZ, /* reachable_time */
344 5*HZ, /* delay_probe_time */
345 3, /* queue_len */
346 3, /* ucast_probes */
347 0, /* app_probes */
348 3, /* mcast_probes */
349 1*HZ, /* anycast_delay */
350 (8*HZ)/10, /* proxy_delay */
351 1*HZ, /* proxy_qlen */
352 64 /* locktime */
353 },
354 30*HZ,128,512,1024 /* copied from ARP ... */
355 };
356
357
358 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
359
360 /*
361 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
362 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
363 * don't increment the usage count. This is used to create entries in
364 * clip_setentry.
365 */
366
367
368 int clip_encap(struct atm_vcc *vcc,int mode)
369 {
370 CLIP_VCC(vcc)->encap = mode;
371 return 0;
372 }
373
374
375 static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
376 {
377 struct clip_priv *clip_priv = PRIV(dev);
378 struct atmarp_entry *entry;
379 struct atm_vcc *vcc;
380 int old;
381 unsigned long flags;
382
383 DPRINTK("clip_start_xmit (skb %p)\n",skb);
384 if (!skb->dst) {
385 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
386 dev_kfree_skb(skb);
387 clip_priv->stats.tx_dropped++;
388 return 0;
389 }
390 if (!skb->dst->neighbour) {
391 #if 0
392 skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
393 if (!skb->dst->neighbour) {
394 dev_kfree_skb(skb); /* lost that one */
395 clip_priv->stats.tx_dropped++;
396 return 0;
397 }
398 #endif
399 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
400 dev_kfree_skb(skb);
401 clip_priv->stats.tx_dropped++;
402 return 0;
403 }
404 entry = NEIGH2ENTRY(skb->dst->neighbour);
405 if (!entry->vccs) {
406 if (time_after(jiffies, entry->expires)) {
407 /* should be resolved */
408 entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
409 to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
410 }
411 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
412 skb_queue_tail(&entry->neigh->arp_queue,skb);
413 else {
414 dev_kfree_skb(skb);
415 clip_priv->stats.tx_dropped++;
416 }
417 return 0;
418 }
419 DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
420 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
421 DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
422 if (entry->vccs->encap) {
423 void *here;
424
425 here = skb_push(skb,RFC1483LLC_LEN);
426 memcpy(here,llc_oui,sizeof(llc_oui));
427 ((u16 *) here)[3] = skb->protocol;
428 }
429 atomic_add(skb->truesize,&vcc->tx_inuse);
430 ATM_SKB(skb)->iovcnt = 0;
431 ATM_SKB(skb)->atm_options = vcc->atm_options;
432 entry->vccs->last_use = jiffies;
433 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
434 old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
435 if (old) {
436 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
437 return 0;
438 }
439 clip_priv->stats.tx_packets++;
440 clip_priv->stats.tx_bytes += skb->len;
441 (void) vcc->send(vcc,skb);
442 if (atm_may_send(vcc,0)) {
443 entry->vccs->xoff = 0;
444 return 0;
445 }
446 spin_lock_irqsave(&clip_priv->xoff_lock,flags);
447 netif_stop_queue(dev); /* XOFF -> throttle immediately */
448 barrier();
449 if (!entry->vccs->xoff)
450 netif_start_queue(dev);
451 /* Oh, we just raced with clip_pop. netif_start_queue should be
452 good enough, because nothing should really be asleep because
453 of the brief netif_stop_queue. If this isn't true or if it
454 changes, use netif_wake_queue instead. */
455 spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
456 return 0;
457 }
458
459
460 static struct net_device_stats *clip_get_stats(struct net_device *dev)
461 {
462 return &PRIV(dev)->stats;
463 }
464
465
466 int clip_mkip(struct atm_vcc *vcc,int timeout)
467 {
468 struct clip_vcc *clip_vcc;
469 struct sk_buff_head copy;
470 struct sk_buff *skb;
471
472 if (!vcc->push) return -EBADFD;
473 clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
474 if (!clip_vcc) return -ENOMEM;
475 DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
476 clip_vcc->vcc = vcc;
477 vcc->user_back = clip_vcc;
478 clip_vcc->entry = NULL;
479 clip_vcc->xoff = 0;
480 clip_vcc->encap = 1;
481 clip_vcc->last_use = jiffies;
482 clip_vcc->idle_timeout = timeout*HZ;
483 clip_vcc->old_push = vcc->push;
484 clip_vcc->old_pop = vcc->pop;
485 vcc->push = clip_push;
486 vcc->pop = clip_pop;
487 skb_queue_head_init(©);
488 skb_migrate(&vcc->recvq,©);
489 /* re-process everything received between connection setup and MKIP */
490 while ((skb = skb_dequeue(©)))
491 if (!clip_devs) {
492 atm_return(vcc,skb->truesize);
493 kfree_skb(skb);
494 }
495 else {
496 unsigned int len = skb->len;
497
498 clip_push(vcc,skb);
499 PRIV(skb->dev)->stats.rx_packets--;
500 PRIV(skb->dev)->stats.rx_bytes -= len;
501 }
502 return 0;
503 }
504
505
506 int clip_setentry(struct atm_vcc *vcc,u32 ip)
507 {
508 struct neighbour *neigh;
509 struct atmarp_entry *entry;
510 int error;
511 struct clip_vcc *clip_vcc;
512 struct rtable *rt;
513
514 if (vcc->push != clip_push) {
515 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
516 return -EBADF;
517 }
518 clip_vcc = CLIP_VCC(vcc);
519 if (!ip) {
520 if (!clip_vcc->entry) {
521 printk(KERN_ERR "hiding hidden ATMARP entry\n");
522 return 0;
523 }
524 DPRINTK("setentry: remove\n");
525 unlink_clip_vcc(clip_vcc);
526 return 0;
527 }
528 error = ip_route_output(&rt,ip,0,1,0);
529 if (error) return error;
530 neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
531 ip_rt_put(rt);
532 if (!neigh)
533 return -ENOMEM;
534 entry = NEIGH2ENTRY(neigh);
535 if (entry != clip_vcc->entry) {
536 if (!clip_vcc->entry) DPRINTK("setentry: add\n");
537 else {
538 DPRINTK("setentry: update\n");
539 unlink_clip_vcc(clip_vcc);
540 }
541 link_vcc(clip_vcc,entry);
542 }
543 error = neigh_update(neigh,llc_oui,NUD_PERMANENT,1,0);
544 neigh_release(neigh);
545 return error;
546 }
547
548
549 static int clip_init(struct net_device *dev)
550 {
551 DPRINTK("clip_init %s\n",dev->name);
552 dev->hard_start_xmit = clip_start_xmit;
553 /* sg_xmit ... */
554 dev->hard_header = NULL;
555 dev->rebuild_header = NULL;
556 dev->set_mac_address = NULL;
557 dev->hard_header_parse = NULL;
558 dev->hard_header_cache = NULL;
559 dev->header_cache_update = NULL;
560 dev->change_mtu = NULL;
561 dev->do_ioctl = NULL;
562 dev->get_stats = clip_get_stats;
563 dev->type = ARPHRD_ATM;
564 dev->hard_header_len = RFC1483LLC_LEN;
565 dev->mtu = RFC1626_MTU;
566 dev->addr_len = 0;
567 dev->tx_queue_len = 100; /* "normal" queue (packets) */
568 /* When using a "real" qdisc, the qdisc determines the queue */
569 /* length. tx_queue_len is only used for the default case, */
570 /* without any more elaborate queuing. 100 is a reasonable */
571 /* compromise between decent burst-tolerance and protection */
572 /* against memory hogs. */
573 dev->flags = 0;
574 dev_init_buffers(dev); /* is this ever supposed to be used ? */
575 return 0;
576 }
577
578
579 int clip_create(int number)
580 {
581 struct net_device *dev;
582 struct clip_priv *clip_priv;
583 int error;
584
585 if (number != -1) {
586 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
587 if (PRIV(dev)->number == number) return -EEXIST;
588 }
589 else {
590 number = 0;
591 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
592 if (PRIV(dev)->number >= number)
593 number = PRIV(dev)->number+1;
594 }
595 dev = kmalloc(sizeof(struct net_device)+sizeof(struct clip_priv),
596 GFP_KERNEL);
597 if (!dev) return -ENOMEM;
598 memset(dev,0,sizeof(struct net_device)+sizeof(struct clip_priv));
599 clip_priv = PRIV(dev);
600 sprintf(dev->name,"atm%d",number);
601 dev->init = clip_init;
602 spin_lock_init(&clip_priv->xoff_lock);
603 clip_priv->number = number;
604 error = register_netdev(dev);
605 if (error) {
606 kfree(dev);
607 return error;
608 }
609 clip_priv->next = clip_devs;
610 clip_devs = dev;
611 DPRINTK("registered (net:%s)\n",dev->name);
612 return number;
613 }
614
615
616 static int clip_device_event(struct notifier_block *this,unsigned long event,
617 void *dev)
618 {
619 /* ignore non-CLIP devices */
620 if (((struct net_device *) dev)->type != ARPHRD_ATM ||
621 ((struct net_device *) dev)->init != clip_init)
622 return NOTIFY_DONE;
623 switch (event) {
624 case NETDEV_UP:
625 DPRINTK("clip_device_event NETDEV_UP\n");
626 (void) to_atmarpd(act_up,PRIV(dev)->number,0);
627 break;
628 case NETDEV_GOING_DOWN:
629 DPRINTK("clip_device_event NETDEV_DOWN\n");
630 (void) to_atmarpd(act_down,PRIV(dev)->number,0);
631 break;
632 case NETDEV_CHANGE:
633 case NETDEV_CHANGEMTU:
634 DPRINTK("clip_device_event NETDEV_CHANGE*\n");
635 (void) to_atmarpd(act_change,PRIV(dev)->number,0);
636 break;
637 case NETDEV_REBOOT:
638 case NETDEV_REGISTER:
639 case NETDEV_DOWN:
640 DPRINTK("clip_device_event %ld\n",event);
641 /* ignore */
642 break;
643 default:
644 printk(KERN_WARNING "clip_device_event: unknown event "
645 "%ld\n",event);
646 break;
647 }
648 return NOTIFY_DONE;
649 }
650
651
652 static int clip_inet_event(struct notifier_block *this,unsigned long event,
653 void *ifa)
654 {
655 struct in_device *in_dev;
656
657 in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
658 if (!in_dev || !in_dev->dev) {
659 printk(KERN_WARNING "clip_inet_event: no device\n");
660 return NOTIFY_DONE;
661 }
662 /*
663 * Transitions are of the down-change-up type, so it's sufficient to
664 * handle the change on up.
665 */
666 if (event != NETDEV_UP) return NOTIFY_DONE;
667 return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
668 }
669
670
671 static struct notifier_block clip_dev_notifier = {
672 clip_device_event,
673 NULL,
674 0
675 };
676
677
678
679 static struct notifier_block clip_inet_notifier = {
680 clip_inet_event,
681 NULL,
682 0
683 };
684
685
686
687 static void atmarpd_close(struct atm_vcc *vcc)
688 {
689 struct sk_buff *skb;
690
691 DPRINTK("atmarpd_close\n");
692 atmarpd = NULL; /* assumed to be atomic */
693 barrier();
694 unregister_inetaddr_notifier(&clip_inet_notifier);
695 unregister_netdevice_notifier(&clip_dev_notifier);
696 if (skb_peek(&vcc->recvq))
697 printk(KERN_ERR "atmarpd_close: closing with requests "
698 "pending\n");
699 while ((skb = skb_dequeue(&vcc->recvq))) kfree_skb(skb);
700 DPRINTK("(done)\n");
701 }
702
703
704 static struct atmdev_ops atmarpd_dev_ops = {
705 close: atmarpd_close,
706 };
707
708
709 static struct atm_dev atmarpd_dev = {
710 &atmarpd_dev_ops,
711 NULL, /* no PHY */
712 "arpd", /* type */
713 999, /* dummy device number */
714 NULL,NULL, /* pretend not to have any VCCs */
715 NULL,NULL, /* no data */
716 { 0 }, /* no flags */
717 NULL, /* no local address */
718 { 0 } /* no ESI, no statistics */
719 };
720
721
722 int atm_init_atmarp(struct atm_vcc *vcc)
723 {
724 struct net_device *dev;
725
726 if (atmarpd) return -EADDRINUSE;
727 if (start_timer) {
728 start_timer = 0;
729 init_timer(&idle_timer);
730 idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
731 idle_timer.function = idle_timer_check;
732 add_timer(&idle_timer);
733 }
734 atmarpd = vcc;
735 set_bit(ATM_VF_META,&vcc->flags);
736 set_bit(ATM_VF_READY,&vcc->flags);
737 /* allow replies and avoid getting closed if signaling dies */
738 bind_vcc(vcc,&atmarpd_dev);
739 vcc->push = NULL;
740 vcc->pop = NULL; /* crash */
741 vcc->push_oam = NULL; /* crash */
742 if (register_netdevice_notifier(&clip_dev_notifier))
743 printk(KERN_ERR "register_netdevice_notifier failed\n");
744 if (register_inetaddr_notifier(&clip_inet_notifier))
745 printk(KERN_ERR "register_inetaddr_notifier failed\n");
746 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
747 if (dev->flags & IFF_UP)
748 (void) to_atmarpd(act_up,PRIV(dev)->number,0);
749 return 0;
750 }
751
752
753 void atm_clip_init(void)
754 {
755 clip_tbl.lock = RW_LOCK_UNLOCKED;
756 clip_tbl.kmem_cachep = kmem_cache_create(clip_tbl.id,
757 clip_tbl.entry_size, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
758 }
759
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