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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / net / atm / clip.c
blob8db42d467af3270d24733d873c3a8254a11daa53
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/module.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/skbuff.h>
14 #include <linux/wait.h>
15 #include <linux/timer.h>
16 #include <linux/if_arp.h> /* for some manifest constants */
17 #include <linux/notifier.h>
18 #include <linux/atm.h>
19 #include <linux/atmdev.h>
20 #include <linux/atmclip.h>
21 #include <linux/atmarp.h>
22 #include <linux/ip.h> /* for net/route.h */
23 #include <linux/in.h> /* for struct sockaddr_in */
24 #include <linux/if.h> /* for IFF_UP */
25 #include <linux/inetdevice.h>
26 #include <linux/bitops.h>
27 #include <linux/proc_fs.h>
28 #include <linux/seq_file.h>
29 #include <linux/rcupdate.h>
30 #include <linux/jhash.h>
31 #include <net/route.h> /* for struct rtable and routing */
32 #include <net/icmp.h> /* icmp_send */
33 #include <asm/param.h> /* for HZ */
34 #include <asm/byteorder.h> /* for htons etc. */
35 #include <asm/system.h> /* save/restore_flags */
36 #include <asm/uaccess.h>
37 #include <asm/atomic.h>
38
39 #include "common.h"
40 #include "resources.h"
41 #include "ipcommon.h"
42 #include <net/atmclip.h>
43
44
45 #if 0
46 #define DPRINTK(format,args...) printk(format,##args)
47 #else
48 #define DPRINTK(format,args...)
49 #endif
50
51
52 static struct net_device *clip_devs;
53 static struct atm_vcc *atmarpd;
54 static struct neigh_table clip_tbl;
55 static struct timer_list idle_timer;
56 static int start_timer = 1;
57
58
59 static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
60 {
61 struct atmarp_ctrl *ctrl;
62 struct sk_buff *skb;
63
64 DPRINTK("to_atmarpd(%d)\n",type);
65 if (!atmarpd) return -EUNATCH;
66 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
67 if (!skb) return -ENOMEM;
68 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
69 ctrl->type = type;
70 ctrl->itf_num = itf;
71 ctrl->ip = ip;
72 atm_force_charge(atmarpd,skb->truesize);
73 skb_queue_tail(&atmarpd->sk->sk_receive_queue, skb);
74 atmarpd->sk->sk_data_ready(atmarpd->sk, skb->len);
75 return 0;
76 }
77
78
79 static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
80 {
81 DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
82 entry->neigh);
83 clip_vcc->entry = entry;
84 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
85 clip_vcc->next = entry->vccs;
86 entry->vccs = clip_vcc;
87 entry->neigh->used = jiffies;
88 }
89
90
91 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
92 {
93 struct atmarp_entry *entry = clip_vcc->entry;
94 struct clip_vcc **walk;
95
96 if (!entry) {
97 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
98 return;
99 }
100 spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */
101 entry->neigh->used = jiffies;
102 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
103 if (*walk == clip_vcc) {
104 int error;
105
106 *walk = clip_vcc->next; /* atomic */
107 clip_vcc->entry = NULL;
108 if (clip_vcc->xoff)
109 netif_wake_queue(entry->neigh->dev);
110 if (entry->vccs)
111 goto out;
112 entry->expires = jiffies-1;
113 /* force resolution or expiration */
114 error = neigh_update(entry->neigh, NULL, NUD_NONE,
115 NEIGH_UPDATE_F_ADMIN);
116 if (error)
117 printk(KERN_CRIT "unlink_clip_vcc: "
118 "neigh_update failed with %d\n",error);
119 goto out;
120 }
121 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
122 "0x%p)\n",entry,clip_vcc);
123 out:
124 spin_unlock_bh(&entry->neigh->dev->xmit_lock);
125 }
126
127 /* The neighbour entry n->lock is held. */
128 static int neigh_check_cb(struct neighbour *n)
129 {
130 struct atmarp_entry *entry = NEIGH2ENTRY(n);
131 struct clip_vcc *cv;
132
133 for (cv = entry->vccs; cv; cv = cv->next) {
134 unsigned long exp = cv->last_use + cv->idle_timeout;
135
136 if (cv->idle_timeout && time_after(jiffies, exp)) {
137 DPRINTK("releasing vcc %p->%p of entry %p\n",
138 cv, cv->vcc, entry);
139 vcc_release_async(cv->vcc, -ETIMEDOUT);
140 }
141 }
142
143 if (entry->vccs || time_before(jiffies, entry->expires))
144 return 0;
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
152 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
153 dev_kfree_skb(skb);
154
155 return 0;
156 }
157
158 DPRINTK("expired neigh %p\n",n);
159 return 1;
160 }
161
162 static void idle_timer_check(unsigned long dummy)
163 {
164 write_lock(&clip_tbl.lock);
165 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
166 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
167 write_unlock(&clip_tbl.lock);
168 }
169
170 static int clip_arp_rcv(struct sk_buff *skb)
171 {
172 struct atm_vcc *vcc;
173
174 DPRINTK("clip_arp_rcv\n");
175 vcc = ATM_SKB(skb)->vcc;
176 if (!vcc || !atm_charge(vcc,skb->truesize)) {
177 dev_kfree_skb_any(skb);
178 return 0;
179 }
180 DPRINTK("pushing to %p\n",vcc);
181 DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
182 CLIP_VCC(vcc)->old_push(vcc,skb);
183 return 0;
184 }
185
186 static const unsigned char llc_oui[] = {
187 0xaa, /* DSAP: non-ISO */
188 0xaa, /* SSAP: non-ISO */
189 0x03, /* Ctrl: Unnumbered Information Command PDU */
190 0x00, /* OUI: EtherType */
191 0x00,
192 0x00 };
193
194 static void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
195 {
196 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
197
198 DPRINTK("clip push\n");
199 if (!skb) {
200 DPRINTK("removing VCC %p\n",clip_vcc);
201 if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
202 clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
203 kfree(clip_vcc);
204 return;
205 }
206 atm_return(vcc,skb->truesize);
207 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
208 /* clip_vcc->entry == NULL if we don't have an IP address yet */
209 if (!skb->dev) {
210 dev_kfree_skb_any(skb);
211 return;
212 }
213 ATM_SKB(skb)->vcc = vcc;
214 skb->mac.raw = skb->data;
215 if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
216 llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
217 else {
218 skb->protocol = ((u16 *) skb->data)[3];
219 skb_pull(skb,RFC1483LLC_LEN);
220 if (skb->protocol == htons(ETH_P_ARP)) {
221 PRIV(skb->dev)->stats.rx_packets++;
222 PRIV(skb->dev)->stats.rx_bytes += skb->len;
223 clip_arp_rcv(skb);
224 return;
225 }
226 }
227 clip_vcc->last_use = jiffies;
228 PRIV(skb->dev)->stats.rx_packets++;
229 PRIV(skb->dev)->stats.rx_bytes += skb->len;
230 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
231 netif_rx(skb);
232 }
233
234
235 /*
236 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
237 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
238 */
239
240
241 static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
242 {
243 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
244 struct net_device *dev = skb->dev;
245 int old;
246 unsigned long flags;
247
248 DPRINTK("clip_pop(vcc %p)\n",vcc);
249 clip_vcc->old_pop(vcc,skb);
250 /* skb->dev == NULL in outbound ARP packets */
251 if (!dev) return;
252 spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
253 if (atm_may_send(vcc,0)) {
254 old = xchg(&clip_vcc->xoff,0);
255 if (old) netif_wake_queue(dev);
256 }
257 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
258 }
259
260
261 static void clip_neigh_destroy(struct neighbour *neigh)
262 {
263 DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
264 if (NEIGH2ENTRY(neigh)->vccs)
265 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
266 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
267 }
268
269
270 static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
271 {
272 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
273 to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
274 }
275
276
277 static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
278 {
279 #ifndef CONFIG_ATM_CLIP_NO_ICMP
280 icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
281 #endif
282 kfree_skb(skb);
283 }
284
285
286 static struct neigh_ops clip_neigh_ops = {
287 .family = AF_INET,
288 .destructor = clip_neigh_destroy,
289 .solicit = clip_neigh_solicit,
290 .error_report = clip_neigh_error,
291 .output = dev_queue_xmit,
292 .connected_output = dev_queue_xmit,
293 .hh_output = dev_queue_xmit,
294 .queue_xmit = dev_queue_xmit,
295 };
296
297
298 static int clip_constructor(struct neighbour *neigh)
299 {
300 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
301 struct net_device *dev = neigh->dev;
302 struct in_device *in_dev;
303 struct neigh_parms *parms;
304
305 DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
306 neigh->type = inet_addr_type(entry->ip);
307 if (neigh->type != RTN_UNICAST) return -EINVAL;
308
309 rcu_read_lock();
310 in_dev = rcu_dereference(__in_dev_get(dev));
311 if (!in_dev) {
312 rcu_read_unlock();
313 return -EINVAL;
314 }
315
316 parms = in_dev->arp_parms;
317 __neigh_parms_put(neigh->parms);
318 neigh->parms = neigh_parms_clone(parms);
319 rcu_read_unlock();
320
321 neigh->ops = &clip_neigh_ops;
322 neigh->output = neigh->nud_state & NUD_VALID ?
323 neigh->ops->connected_output : neigh->ops->output;
324 entry->neigh = neigh;
325 entry->vccs = NULL;
326 entry->expires = jiffies-1;
327 return 0;
328 }
329
330 static u32 clip_hash(const void *pkey, const struct net_device *dev)
331 {
332 return jhash_2words(*(u32 *)pkey, dev->ifindex, clip_tbl.hash_rnd);
333 }
334
335 static struct neigh_table clip_tbl = {
336 .family = AF_INET,
337 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
338 .key_len = 4,
339 .hash = clip_hash,
340 .constructor = clip_constructor,
341 .id = "clip_arp_cache",
342
343 /* parameters are copied from ARP ... */
344 .parms = {
345 .tbl = &clip_tbl,
346 .base_reachable_time = 30 * HZ,
347 .retrans_time = 1 * HZ,
348 .gc_staletime = 60 * HZ,
349 .reachable_time = 30 * HZ,
350 .delay_probe_time = 5 * HZ,
351 .queue_len = 3,
352 .ucast_probes = 3,
353 .mcast_probes = 3,
354 .anycast_delay = 1 * HZ,
355 .proxy_delay = (8 * HZ) / 10,
356 .proxy_qlen = 64,
357 .locktime = 1 * HZ,
358 },
359 .gc_interval = 30 * HZ,
360 .gc_thresh1 = 128,
361 .gc_thresh2 = 512,
362 .gc_thresh3 = 1024,
363 };
364
365
366 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
367
368 /*
369 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
370 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
371 * don't increment the usage count. This is used to create entries in
372 * clip_setentry.
373 */
374
375
376 static int clip_encap(struct atm_vcc *vcc,int mode)
377 {
378 CLIP_VCC(vcc)->encap = mode;
379 return 0;
380 }
381
382
383 static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
384 {
385 struct clip_priv *clip_priv = PRIV(dev);
386 struct atmarp_entry *entry;
387 struct atm_vcc *vcc;
388 int old;
389 unsigned long flags;
390
391 DPRINTK("clip_start_xmit (skb %p)\n",skb);
392 if (!skb->dst) {
393 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
394 dev_kfree_skb(skb);
395 clip_priv->stats.tx_dropped++;
396 return 0;
397 }
398 if (!skb->dst->neighbour) {
399 #if 0
400 skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
401 if (!skb->dst->neighbour) {
402 dev_kfree_skb(skb); /* lost that one */
403 clip_priv->stats.tx_dropped++;
404 return 0;
405 }
406 #endif
407 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
408 dev_kfree_skb(skb);
409 clip_priv->stats.tx_dropped++;
410 return 0;
411 }
412 entry = NEIGH2ENTRY(skb->dst->neighbour);
413 if (!entry->vccs) {
414 if (time_after(jiffies, entry->expires)) {
415 /* should be resolved */
416 entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
417 to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
418 }
419 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
420 skb_queue_tail(&entry->neigh->arp_queue,skb);
421 else {
422 dev_kfree_skb(skb);
423 clip_priv->stats.tx_dropped++;
424 }
425 return 0;
426 }
427 DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
428 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
429 DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
430 if (entry->vccs->encap) {
431 void *here;
432
433 here = skb_push(skb,RFC1483LLC_LEN);
434 memcpy(here,llc_oui,sizeof(llc_oui));
435 ((u16 *) here)[3] = skb->protocol;
436 }
437 atomic_add(skb->truesize, &vcc->sk->sk_wmem_alloc);
438 ATM_SKB(skb)->atm_options = vcc->atm_options;
439 entry->vccs->last_use = jiffies;
440 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
441 old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
442 if (old) {
443 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
444 return 0;
445 }
446 clip_priv->stats.tx_packets++;
447 clip_priv->stats.tx_bytes += skb->len;
448 (void) vcc->send(vcc,skb);
449 if (atm_may_send(vcc,0)) {
450 entry->vccs->xoff = 0;
451 return 0;
452 }
453 spin_lock_irqsave(&clip_priv->xoff_lock,flags);
454 netif_stop_queue(dev); /* XOFF -> throttle immediately */
455 barrier();
456 if (!entry->vccs->xoff)
457 netif_start_queue(dev);
458 /* Oh, we just raced with clip_pop. netif_start_queue should be
459 good enough, because nothing should really be asleep because
460 of the brief netif_stop_queue. If this isn't true or if it
461 changes, use netif_wake_queue instead. */
462 spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
463 return 0;
464 }
465
466
467 static struct net_device_stats *clip_get_stats(struct net_device *dev)
468 {
469 return &PRIV(dev)->stats;
470 }
471
472
473 static int clip_mkip(struct atm_vcc *vcc,int timeout)
474 {
475 struct clip_vcc *clip_vcc;
476 struct sk_buff_head copy;
477 struct sk_buff *skb;
478
479 if (!vcc->push) return -EBADFD;
480 clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
481 if (!clip_vcc) return -ENOMEM;
482 DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
483 clip_vcc->vcc = vcc;
484 vcc->user_back = clip_vcc;
485 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
486 clip_vcc->entry = NULL;
487 clip_vcc->xoff = 0;
488 clip_vcc->encap = 1;
489 clip_vcc->last_use = jiffies;
490 clip_vcc->idle_timeout = timeout*HZ;
491 clip_vcc->old_push = vcc->push;
492 clip_vcc->old_pop = vcc->pop;
493 vcc->push = clip_push;
494 vcc->pop = clip_pop;
495 skb_queue_head_init(&copy);
496 skb_migrate(&vcc->sk->sk_receive_queue, &copy);
497 /* re-process everything received between connection setup and MKIP */
498 while ((skb = skb_dequeue(&copy)) != NULL)
499 if (!clip_devs) {
500 atm_return(vcc,skb->truesize);
501 kfree_skb(skb);
502 }
503 else {
504 unsigned int len = skb->len;
505
506 clip_push(vcc,skb);
507 PRIV(skb->dev)->stats.rx_packets--;
508 PRIV(skb->dev)->stats.rx_bytes -= len;
509 }
510 return 0;
511 }
512
513
514 static int clip_setentry(struct atm_vcc *vcc,u32 ip)
515 {
516 struct neighbour *neigh;
517 struct atmarp_entry *entry;
518 int error;
519 struct clip_vcc *clip_vcc;
520 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1 } } };
521 struct rtable *rt;
522
523 if (vcc->push != clip_push) {
524 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
525 return -EBADF;
526 }
527 clip_vcc = CLIP_VCC(vcc);
528 if (!ip) {
529 if (!clip_vcc->entry) {
530 printk(KERN_ERR "hiding hidden ATMARP entry\n");
531 return 0;
532 }
533 DPRINTK("setentry: remove\n");
534 unlink_clip_vcc(clip_vcc);
535 return 0;
536 }
537 error = ip_route_output_key(&rt,&fl);
538 if (error) return error;
539 neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
540 ip_rt_put(rt);
541 if (!neigh)
542 return -ENOMEM;
543 entry = NEIGH2ENTRY(neigh);
544 if (entry != clip_vcc->entry) {
545 if (!clip_vcc->entry) DPRINTK("setentry: add\n");
546 else {
547 DPRINTK("setentry: update\n");
548 unlink_clip_vcc(clip_vcc);
549 }
550 link_vcc(clip_vcc,entry);
551 }
552 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
553 NEIGH_UPDATE_F_OVERRIDE|NEIGH_UPDATE_F_ADMIN);
554 neigh_release(neigh);
555 return error;
556 }
557
558
559 static void clip_setup(struct net_device *dev)
560 {
561 dev->hard_start_xmit = clip_start_xmit;
562 /* sg_xmit ... */
563 dev->get_stats = clip_get_stats;
564 dev->type = ARPHRD_ATM;
565 dev->hard_header_len = RFC1483LLC_LEN;
566 dev->mtu = RFC1626_MTU;
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 }
574
575
576 static int clip_create(int number)
577 {
578 struct net_device *dev;
579 struct clip_priv *clip_priv;
580 int error;
581
582 if (number != -1) {
583 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
584 if (PRIV(dev)->number == number) return -EEXIST;
585 }
586 else {
587 number = 0;
588 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
589 if (PRIV(dev)->number >= number)
590 number = PRIV(dev)->number+1;
591 }
592 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
593 if (!dev)
594 return -ENOMEM;
595 clip_priv = PRIV(dev);
596 sprintf(dev->name,"atm%d",number);
597 spin_lock_init(&clip_priv->xoff_lock);
598 clip_priv->number = number;
599 error = register_netdev(dev);
600 if (error) {
601 free_netdev(dev);
602 return error;
603 }
604 clip_priv->next = clip_devs;
605 clip_devs = dev;
606 DPRINTK("registered (net:%s)\n",dev->name);
607 return number;
608 }
609
610
611 static int clip_device_event(struct notifier_block *this,unsigned long event,
612 void *dev)
613 {
614 /* ignore non-CLIP devices */
615 if (((struct net_device *) dev)->type != ARPHRD_ATM ||
616 ((struct net_device *) dev)->hard_start_xmit != clip_start_xmit)
617 return NOTIFY_DONE;
618 switch (event) {
619 case NETDEV_UP:
620 DPRINTK("clip_device_event NETDEV_UP\n");
621 (void) to_atmarpd(act_up,PRIV(dev)->number,0);
622 break;
623 case NETDEV_GOING_DOWN:
624 DPRINTK("clip_device_event NETDEV_DOWN\n");
625 (void) to_atmarpd(act_down,PRIV(dev)->number,0);
626 break;
627 case NETDEV_CHANGE:
628 case NETDEV_CHANGEMTU:
629 DPRINTK("clip_device_event NETDEV_CHANGE*\n");
630 (void) to_atmarpd(act_change,PRIV(dev)->number,0);
631 break;
632 case NETDEV_REBOOT:
633 case NETDEV_REGISTER:
634 case NETDEV_DOWN:
635 DPRINTK("clip_device_event %ld\n",event);
636 /* ignore */
637 break;
638 default:
639 printk(KERN_WARNING "clip_device_event: unknown event "
640 "%ld\n",event);
641 break;
642 }
643 return NOTIFY_DONE;
644 }
645
646
647 static int clip_inet_event(struct notifier_block *this,unsigned long event,
648 void *ifa)
649 {
650 struct in_device *in_dev;
651
652 in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
653 if (!in_dev || !in_dev->dev) {
654 printk(KERN_WARNING "clip_inet_event: no device\n");
655 return NOTIFY_DONE;
656 }
657 /*
658 * Transitions are of the down-change-up type, so it's sufficient to
659 * handle the change on up.
660 */
661 if (event != NETDEV_UP) return NOTIFY_DONE;
662 return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
663 }
664
665
666 static struct notifier_block clip_dev_notifier = {
667 clip_device_event,
668 NULL,
669 0
670 };
671
672
673
674 static struct notifier_block clip_inet_notifier = {
675 clip_inet_event,
676 NULL,
677 0
678 };
679
680
681
682 static void atmarpd_close(struct atm_vcc *vcc)
683 {
684 DPRINTK("atmarpd_close\n");
685 atmarpd = NULL; /* assumed to be atomic */
686 barrier();
687 unregister_inetaddr_notifier(&clip_inet_notifier);
688 unregister_netdevice_notifier(&clip_dev_notifier);
689 if (skb_peek(&vcc->sk->sk_receive_queue))
690 printk(KERN_ERR "atmarpd_close: closing with requests "
691 "pending\n");
692 skb_queue_purge(&vcc->sk->sk_receive_queue);
693 DPRINTK("(done)\n");
694 module_put(THIS_MODULE);
695 }
696
697
698 static struct atmdev_ops atmarpd_dev_ops = {
699 .close = atmarpd_close
700 };
701
702
703 static struct atm_dev atmarpd_dev = {
704 .ops = &atmarpd_dev_ops,
705 .type = "arpd",
706 .number = 999,
707 .lock = SPIN_LOCK_UNLOCKED
708 };
709
710
711 static int atm_init_atmarp(struct atm_vcc *vcc)
712 {
713 if (atmarpd) return -EADDRINUSE;
714 if (start_timer) {
715 start_timer = 0;
716 init_timer(&idle_timer);
717 idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
718 idle_timer.function = idle_timer_check;
719 add_timer(&idle_timer);
720 }
721 atmarpd = vcc;
722 set_bit(ATM_VF_META,&vcc->flags);
723 set_bit(ATM_VF_READY,&vcc->flags);
724 /* allow replies and avoid getting closed if signaling dies */
725 vcc->dev = &atmarpd_dev;
726 vcc_insert_socket(vcc->sk);
727 vcc->push = NULL;
728 vcc->pop = NULL; /* crash */
729 vcc->push_oam = NULL; /* crash */
730 if (register_netdevice_notifier(&clip_dev_notifier))
731 printk(KERN_ERR "register_netdevice_notifier failed\n");
732 if (register_inetaddr_notifier(&clip_inet_notifier))
733 printk(KERN_ERR "register_inetaddr_notifier failed\n");
734 return 0;
735 }
736
737 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
738 {
739 struct atm_vcc *vcc = ATM_SD(sock);
740 int err = 0;
741
742 switch (cmd) {
743 case SIOCMKCLIP:
744 case ATMARPD_CTRL:
745 case ATMARP_MKIP:
746 case ATMARP_SETENTRY:
747 case ATMARP_ENCAP:
748 if (!capable(CAP_NET_ADMIN))
749 return -EPERM;
750 break;
751 default:
752 return -ENOIOCTLCMD;
753 }
754
755 switch (cmd) {
756 case SIOCMKCLIP:
757 err = clip_create(arg);
758 break;
759 case ATMARPD_CTRL:
760 err = atm_init_atmarp(vcc);
761 if (!err) {
762 sock->state = SS_CONNECTED;
763 __module_get(THIS_MODULE);
764 }
765 break;
766 case ATMARP_MKIP:
767 err = clip_mkip(vcc ,arg);
768 break;
769 case ATMARP_SETENTRY:
770 err = clip_setentry(vcc, arg);
771 break;
772 case ATMARP_ENCAP:
773 err = clip_encap(vcc, arg);
774 break;
775 }
776 return err;
777 }
778
779 static struct atm_ioctl clip_ioctl_ops = {
780 .owner = THIS_MODULE,
781 .ioctl = clip_ioctl,
782 };
783
784 #ifdef CONFIG_PROC_FS
785
786 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
787 {
788 static int code[] = { 1,2,10,6,1,0 };
789 static int e164[] = { 1,8,4,6,1,0 };
790
791 if (*addr->sas_addr.pub) {
792 seq_printf(seq, "%s", addr->sas_addr.pub);
793 if (*addr->sas_addr.prv)
794 seq_putc(seq, '+');
795 } else if (!*addr->sas_addr.prv) {
796 seq_printf(seq, "%s", "(none)");
797 return;
798 }
799 if (*addr->sas_addr.prv) {
800 unsigned char *prv = addr->sas_addr.prv;
801 int *fields;
802 int i, j;
803
804 fields = *prv == ATM_AFI_E164 ? e164 : code;
805 for (i = 0; fields[i]; i++) {
806 for (j = fields[i]; j; j--)
807 seq_printf(seq, "%02X", *prv++);
808 if (fields[i+1])
809 seq_putc(seq, '.');
810 }
811 }
812 }
813
814 /* This means the neighbour entry has no attached VCC objects. */
815 #define SEQ_NO_VCC_TOKEN ((void *) 2)
816
817 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
818 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
819 {
820 unsigned long exp;
821 char buf[17];
822 int svc, llc, off;
823
824 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
825 (clip_vcc->vcc->sk->sk_family == AF_ATMSVC));
826
827 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
828 clip_vcc->encap);
829
830 if (clip_vcc == SEQ_NO_VCC_TOKEN)
831 exp = entry->neigh->used;
832 else
833 exp = clip_vcc->last_use;
834
835 exp = (jiffies - exp) / HZ;
836
837 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
838 dev->name,
839 svc ? "SVC" : "PVC",
840 llc ? "LLC" : "NULL",
841 exp);
842
843 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d",
844 NIPQUAD(entry->ip));
845 while (off < 16)
846 buf[off++] = ' ';
847 buf[off] = '\0';
848 seq_printf(seq, "%s", buf);
849
850 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
851 if (time_before(jiffies, entry->expires))
852 seq_printf(seq, "(resolving)\n");
853 else
854 seq_printf(seq, "(expired, ref %d)\n",
855 atomic_read(&entry->neigh->refcnt));
856 } else if (!svc) {
857 seq_printf(seq, "%d.%d.%d\n",
858 clip_vcc->vcc->dev->number,
859 clip_vcc->vcc->vpi,
860 clip_vcc->vcc->vci);
861 } else {
862 svc_addr(seq, &clip_vcc->vcc->remote);
863 seq_putc(seq, '\n');
864 }
865 }
866
867 struct clip_seq_state {
868 /* This member must be first. */
869 struct neigh_seq_state ns;
870
871 /* Local to clip specific iteration. */
872 struct clip_vcc *vcc;
873 };
874
875 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
876 struct clip_vcc *curr)
877 {
878 if (!curr) {
879 curr = e->vccs;
880 if (!curr)
881 return SEQ_NO_VCC_TOKEN;
882 return curr;
883 }
884 if (curr == SEQ_NO_VCC_TOKEN)
885 return NULL;
886
887 curr = curr->next;
888
889 return curr;
890 }
891
892 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
893 struct atmarp_entry *e, loff_t *pos)
894 {
895 struct clip_vcc *vcc = state->vcc;
896
897 vcc = clip_seq_next_vcc(e, vcc);
898 if (vcc && pos != NULL) {
899 while (*pos) {
900 vcc = clip_seq_next_vcc(e, vcc);
901 if (!vcc)
902 break;
903 --(*pos);
904 }
905 }
906 state->vcc = vcc;
907
908 return vcc;
909 }
910
911 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
912 struct neighbour *n, loff_t *pos)
913 {
914 struct clip_seq_state *state = (struct clip_seq_state *) _state;
915
916 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
917 }
918
919 static void *clip_seq_start(struct seq_file *seq, loff_t *pos)
920 {
921 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
922 }
923
924 static int clip_seq_show(struct seq_file *seq, void *v)
925 {
926 static char atm_arp_banner[] =
927 "IPitf TypeEncp Idle IP address ATM address\n";
928
929 if (v == SEQ_START_TOKEN) {
930 seq_puts(seq, atm_arp_banner);
931 } else {
932 struct clip_seq_state *state = seq->private;
933 struct neighbour *n = v;
934 struct clip_vcc *vcc = state->vcc;
935
936 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
937 }
938 return 0;
939 }
940
941 static struct seq_operations arp_seq_ops = {
942 .start = clip_seq_start,
943 .next = neigh_seq_next,
944 .stop = neigh_seq_stop,
945 .show = clip_seq_show,
946 };
947
948 static int arp_seq_open(struct inode *inode, struct file *file)
949 {
950 struct clip_seq_state *state;
951 struct seq_file *seq;
952 int rc = -EAGAIN;
953
954 state = kmalloc(sizeof(*state), GFP_KERNEL);
955 if (!state) {
956 rc = -ENOMEM;
957 goto out_kfree;
958 }
959 memset(state, 0, sizeof(*state));
960 state->ns.neigh_sub_iter = clip_seq_sub_iter;
961
962 rc = seq_open(file, &arp_seq_ops);
963 if (rc)
964 goto out_kfree;
965
966 seq = file->private_data;
967 seq->private = state;
968 out:
969 return rc;
970
971 out_kfree:
972 kfree(state);
973 goto out;
974 }
975
976 static struct file_operations arp_seq_fops = {
977 .open = arp_seq_open,
978 .read = seq_read,
979 .llseek = seq_lseek,
980 .release = seq_release_private,
981 .owner = THIS_MODULE
982 };
983 #endif
984
985 static int __init atm_clip_init(void)
986 {
987 neigh_table_init(&clip_tbl);
988
989 clip_tbl_hook = &clip_tbl;
990 register_atm_ioctl(&clip_ioctl_ops);
991
992 #ifdef CONFIG_PROC_FS
993 {
994 struct proc_dir_entry *p;
995
996 p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
997 if (p)
998 p->proc_fops = &arp_seq_fops;
999 }
1000 #endif
1001
1002 return 0;
1003 }
1004
1005 static void __exit atm_clip_exit(void)
1006 {
1007 struct net_device *dev, *next;
1008
1009 remove_proc_entry("arp", atm_proc_root);
1010
1011 deregister_atm_ioctl(&clip_ioctl_ops);
1012
1013 /* First, stop the idle timer, so it stops banging
1014 * on the table.
1015 */
1016 if (start_timer == 0)
1017 del_timer(&idle_timer);
1018
1019 /* Next, purge the table, so that the device
1020 * unregister loop below does not hang due to
1021 * device references remaining in the table.
1022 */
1023 neigh_ifdown(&clip_tbl, NULL);
1024
1025 dev = clip_devs;
1026 while (dev) {
1027 next = PRIV(dev)->next;
1028 unregister_netdev(dev);
1029 free_netdev(dev);
1030 dev = next;
1031 }
1032
1033 /* Now it is safe to fully shutdown whole table. */
1034 neigh_table_clear(&clip_tbl);
1035
1036 clip_tbl_hook = NULL;
1037 }
1038
1039 module_init(atm_clip_init);
1040 module_exit(atm_clip_exit);
1041
1042 MODULE_LICENSE("GPL");
MOXA 2.6.9 from sdlinux-moxaart.tgz