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[ATM]: Clip timer race.
[net-next-2.6.git] / net / atm / clip.c
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1da177e4
LT		 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>
4fc268d2 22#include <linux/capability.h>
1da177e4
LT		 23#include <linux/ip.h> /* for net/route.h */
24#include <linux/in.h> /* for struct sockaddr_in */
25#include <linux/if.h> /* for IFF_UP */
26#include <linux/inetdevice.h>
27#include <linux/bitops.h>
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/rcupdate.h>
31#include <linux/jhash.h>
32#include <net/route.h> /* for struct rtable and routing */
33#include <net/icmp.h> /* icmp_send */
34#include <asm/param.h> /* for HZ */
35#include <asm/byteorder.h> /* for htons etc. */
36#include <asm/system.h> /* save/restore_flags */
37#include <asm/uaccess.h>
38#include <asm/atomic.h>
39
40#include "common.h"
41#include "resources.h"
42#include "ipcommon.h"
43#include <net/atmclip.h>
44
45
46#if 0
47#define DPRINTK(format,args...) printk(format,##args)
48#else
49#define DPRINTK(format,args...)
50#endif
51
52
53static struct net_device *clip_devs;
54static struct atm_vcc *atmarpd;
55static struct neigh_table clip_tbl;
56static struct timer_list idle_timer;
1da177e4
LT		 57
58static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
59{
60 struct sock *sk;
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
74 sk = sk_atm(atmarpd);
75 skb_queue_tail(&sk->sk_receive_queue, skb);
76 sk->sk_data_ready(sk, skb->len);
77 return 0;
78}
79
80
81static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
82{
83 DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
84 entry->neigh);
85 clip_vcc->entry = entry;
86 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
87 clip_vcc->next = entry->vccs;
88 entry->vccs = clip_vcc;
89 entry->neigh->used = jiffies;
90}
91
92
93static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
94{
95 struct atmarp_entry *entry = clip_vcc->entry;
96 struct clip_vcc **walk;
97
98 if (!entry) {
99 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
100 return;
101 }
102 spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */
103 entry->neigh->used = jiffies;
104 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
105 if (*walk == clip_vcc) {
106 int error;
107
108 *walk = clip_vcc->next; /* atomic */
109 clip_vcc->entry = NULL;
110 if (clip_vcc->xoff)
111 netif_wake_queue(entry->neigh->dev);
112 if (entry->vccs)
113 goto out;
114 entry->expires = jiffies-1;
115 /* force resolution or expiration */
116 error = neigh_update(entry->neigh, NULL, NUD_NONE,
117 NEIGH_UPDATE_F_ADMIN);
118 if (error)
119 printk(KERN_CRIT "unlink_clip_vcc: "
120 "neigh_update failed with %d\n",error);
121 goto out;
122 }
123 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
124 "0x%p)\n",entry,clip_vcc);
125out:
126 spin_unlock_bh(&entry->neigh->dev->xmit_lock);
127}
128
129/* The neighbour entry n->lock is held. */
130static int neigh_check_cb(struct neighbour *n)
131{
132 struct atmarp_entry *entry = NEIGH2ENTRY(n);
133 struct clip_vcc *cv;
134
135 for (cv = entry->vccs; cv; cv = cv->next) {
136 unsigned long exp = cv->last_use + cv->idle_timeout;
137
138 if (cv->idle_timeout && time_after(jiffies, exp)) {
139 DPRINTK("releasing vcc %p->%p of entry %p\n",
140 cv, cv->vcc, entry);
141 vcc_release_async(cv->vcc, -ETIMEDOUT);
142 }
143 }
144
145 if (entry->vccs || time_before(jiffies, entry->expires))
146 return 0;
147
148 if (atomic_read(&n->refcnt) > 1) {
149 struct sk_buff *skb;
150
151 DPRINTK("destruction postponed with ref %d\n",
152 atomic_read(&n->refcnt));
153
154 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
155 dev_kfree_skb(skb);
156
157 return 0;
158 }
159
160 DPRINTK("expired neigh %p\n",n);
161 return 1;
162}
163
164static void idle_timer_check(unsigned long dummy)
165{
166 write_lock(&clip_tbl.lock);
167 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
168 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
169 write_unlock(&clip_tbl.lock);
170}
171
172static int clip_arp_rcv(struct sk_buff *skb)
173{
174 struct atm_vcc *vcc;
175
176 DPRINTK("clip_arp_rcv\n");
177 vcc = ATM_SKB(skb)->vcc;
178 if (!vcc || !atm_charge(vcc,skb->truesize)) {
179 dev_kfree_skb_any(skb);
180 return 0;
181 }
182 DPRINTK("pushing to %p\n",vcc);
183 DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
184 CLIP_VCC(vcc)->old_push(vcc,skb);
185 return 0;
186}
187
188static const unsigned char llc_oui[] = {
189 0xaa, /* DSAP: non-ISO */
190 0xaa, /* SSAP: non-ISO */
191 0x03, /* Ctrl: Unnumbered Information Command PDU */
192 0x00, /* OUI: EtherType */
193 0x00,
194 0x00 };
195
196static void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
197{
198 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
199
200 DPRINTK("clip push\n");
201 if (!skb) {
202 DPRINTK("removing VCC %p\n",clip_vcc);
203 if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
204 clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
205 kfree(clip_vcc);
206 return;
207 }
208 atm_return(vcc,skb->truesize);
209 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
210 /* clip_vcc->entry == NULL if we don't have an IP address yet */
211 if (!skb->dev) {
212 dev_kfree_skb_any(skb);
213 return;
214 }
215 ATM_SKB(skb)->vcc = vcc;
216 skb->mac.raw = skb->data;
217 if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
218 llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
219 else {
220 skb->protocol = ((u16 *) skb->data)[3];
221 skb_pull(skb,RFC1483LLC_LEN);
222 if (skb->protocol == htons(ETH_P_ARP)) {
223 PRIV(skb->dev)->stats.rx_packets++;
224 PRIV(skb->dev)->stats.rx_bytes += skb->len;
225 clip_arp_rcv(skb);
226 return;
227 }
228 }
229 clip_vcc->last_use = jiffies;
230 PRIV(skb->dev)->stats.rx_packets++;
231 PRIV(skb->dev)->stats.rx_bytes += skb->len;
232 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
233 netif_rx(skb);
234}
235
236
237/*
238 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
239 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
240 */
241
242
243static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
244{
245 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
246 struct net_device *dev = skb->dev;
247 int old;
248 unsigned long flags;
249
250 DPRINTK("clip_pop(vcc %p)\n",vcc);
251 clip_vcc->old_pop(vcc,skb);
252 /* skb->dev == NULL in outbound ARP packets */
253 if (!dev) return;
254 spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
255 if (atm_may_send(vcc,0)) {
256 old = xchg(&clip_vcc->xoff,0);
257 if (old) netif_wake_queue(dev);
258 }
259 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
260}
261
262
263static void clip_neigh_destroy(struct neighbour *neigh)
264{
265 DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
266 if (NEIGH2ENTRY(neigh)->vccs)
267 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
268 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
269}
270
271
272static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
273{
274 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
275 to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
276}
277
278
279static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
280{
281#ifndef CONFIG_ATM_CLIP_NO_ICMP
282 icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
283#endif
284 kfree_skb(skb);
285}
286
287
288static struct neigh_ops clip_neigh_ops = {
289 .family = AF_INET,
1da177e4
LT		 290 .solicit = clip_neigh_solicit,
291 .error_report = clip_neigh_error,
292 .output = dev_queue_xmit,
293 .connected_output = dev_queue_xmit,
294 .hh_output = dev_queue_xmit,
295 .queue_xmit = dev_queue_xmit,
296};
297
298
299static int clip_constructor(struct neighbour *neigh)
300{
301 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
302 struct net_device *dev = neigh->dev;
303 struct in_device *in_dev;
304 struct neigh_parms *parms;
305
306 DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
307 neigh->type = inet_addr_type(entry->ip);
308 if (neigh->type != RTN_UNICAST) return -EINVAL;
309
310 rcu_read_lock();
e5ed6399 311 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 312 if (!in_dev) {
313 rcu_read_unlock();
314 return -EINVAL;
315 }
316
317 parms = in_dev->arp_parms;
318 __neigh_parms_put(neigh->parms);
319 neigh->parms = neigh_parms_clone(parms);
320 rcu_read_unlock();
321
322 neigh->ops = &clip_neigh_ops;
323 neigh->output = neigh->nud_state & NUD_VALID ?
324 neigh->ops->connected_output : neigh->ops->output;
325 entry->neigh = neigh;
326 entry->vccs = NULL;
327 entry->expires = jiffies-1;
328 return 0;
329}
330
331static u32 clip_hash(const void *pkey, const struct net_device *dev)
332{
333 return jhash_2words(*(u32 *)pkey, dev->ifindex, clip_tbl.hash_rnd);
334}
335
336static struct neigh_table clip_tbl = {
337 .family = AF_INET,
338 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
339 .key_len = 4,
340 .hash = clip_hash,
341 .constructor = clip_constructor,
342 .id = "clip_arp_cache",
343
344 /* parameters are copied from ARP ... */
345 .parms = {
346 .tbl = &clip_tbl,
aa837b5b 347 .neigh_destructor = clip_neigh_destroy,
1da177e4
LT		 348 .base_reachable_time = 30 * HZ,
349 .retrans_time = 1 * HZ,
350 .gc_staletime = 60 * HZ,
351 .reachable_time = 30 * HZ,
352 .delay_probe_time = 5 * HZ,
353 .queue_len = 3,
354 .ucast_probes = 3,
355 .mcast_probes = 3,
356 .anycast_delay = 1 * HZ,
357 .proxy_delay = (8 * HZ) / 10,
358 .proxy_qlen = 64,
359 .locktime = 1 * HZ,
360 },
361 .gc_interval = 30 * HZ,
362 .gc_thresh1 = 128,
363 .gc_thresh2 = 512,
364 .gc_thresh3 = 1024,
365};
366
367
368/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
369
370/*
371 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
372 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
373 * don't increment the usage count. This is used to create entries in
374 * clip_setentry.
375 */
376
377
378static int clip_encap(struct atm_vcc *vcc,int mode)
379{
380 CLIP_VCC(vcc)->encap = mode;
381 return 0;
382}
383
384
385static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
386{
387 struct clip_priv *clip_priv = PRIV(dev);
388 struct atmarp_entry *entry;
389 struct atm_vcc *vcc;
390 int old;
391 unsigned long flags;
392
393 DPRINTK("clip_start_xmit (skb %p)\n",skb);
394 if (!skb->dst) {
395 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
396 dev_kfree_skb(skb);
397 clip_priv->stats.tx_dropped++;
398 return 0;
399 }
400 if (!skb->dst->neighbour) {
401#if 0
402 skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
403 if (!skb->dst->neighbour) {
404 dev_kfree_skb(skb); /* lost that one */
405 clip_priv->stats.tx_dropped++;
406 return 0;
407 }
408#endif
409 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
410 dev_kfree_skb(skb);
411 clip_priv->stats.tx_dropped++;
412 return 0;
413 }
414 entry = NEIGH2ENTRY(skb->dst->neighbour);
415 if (!entry->vccs) {
416 if (time_after(jiffies, entry->expires)) {
417 /* should be resolved */
418 entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
419 to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
420 }
421 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
422 skb_queue_tail(&entry->neigh->arp_queue,skb);
423 else {
424 dev_kfree_skb(skb);
425 clip_priv->stats.tx_dropped++;
426 }
427 return 0;
428 }
429 DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
430 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
431 DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
432 if (entry->vccs->encap) {
433 void *here;
434
435 here = skb_push(skb,RFC1483LLC_LEN);
436 memcpy(here,llc_oui,sizeof(llc_oui));
437 ((u16 *) here)[3] = skb->protocol;
438 }
439 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
440 ATM_SKB(skb)->atm_options = vcc->atm_options;
441 entry->vccs->last_use = jiffies;
442 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
443 old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
444 if (old) {
445 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
446 return 0;
447 }
448 clip_priv->stats.tx_packets++;
449 clip_priv->stats.tx_bytes += skb->len;
450 (void) vcc->send(vcc,skb);
451 if (atm_may_send(vcc,0)) {
452 entry->vccs->xoff = 0;
453 return 0;
454 }
455 spin_lock_irqsave(&clip_priv->xoff_lock,flags);
456 netif_stop_queue(dev); /* XOFF -> throttle immediately */
457 barrier();
458 if (!entry->vccs->xoff)
459 netif_start_queue(dev);
460 /* Oh, we just raced with clip_pop. netif_start_queue should be
461 good enough, because nothing should really be asleep because
462 of the brief netif_stop_queue. If this isn't true or if it
463 changes, use netif_wake_queue instead. */
464 spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
465 return 0;
466}
467
468
469static struct net_device_stats *clip_get_stats(struct net_device *dev)
470{
471 return &PRIV(dev)->stats;
472}
473
474
475static int clip_mkip(struct atm_vcc *vcc,int timeout)
476{
477 struct clip_vcc *clip_vcc;
478 struct sk_buff_head copy;
479 struct sk_buff *skb;
480
481 if (!vcc->push) return -EBADFD;
482 clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
483 if (!clip_vcc) return -ENOMEM;
484 DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
485 clip_vcc->vcc = vcc;
486 vcc->user_back = clip_vcc;
487 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
488 clip_vcc->entry = NULL;
489 clip_vcc->xoff = 0;
490 clip_vcc->encap = 1;
491 clip_vcc->last_use = jiffies;
492 clip_vcc->idle_timeout = timeout*HZ;
493 clip_vcc->old_push = vcc->push;
494 clip_vcc->old_pop = vcc->pop;
495 vcc->push = clip_push;
496 vcc->pop = clip_pop;
497 skb_queue_head_init(&copy);
498 skb_migrate(&sk_atm(vcc)->sk_receive_queue, &copy);
499 /* re-process everything received between connection setup and MKIP */
500 while ((skb = skb_dequeue(&copy)) != NULL)
501 if (!clip_devs) {
502 atm_return(vcc,skb->truesize);
503 kfree_skb(skb);
504 }
505 else {
506 unsigned int len = skb->len;
507
508 clip_push(vcc,skb);
509 PRIV(skb->dev)->stats.rx_packets--;
510 PRIV(skb->dev)->stats.rx_bytes -= len;
511 }
512 return 0;
513}
514
515
516static int clip_setentry(struct atm_vcc *vcc,u32 ip)
517{
518 struct neighbour *neigh;
519 struct atmarp_entry *entry;
520 int error;
521 struct clip_vcc *clip_vcc;
522 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1 } } };
523 struct rtable *rt;
524
525 if (vcc->push != clip_push) {
526 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
527 return -EBADF;
528 }
529 clip_vcc = CLIP_VCC(vcc);
530 if (!ip) {
531 if (!clip_vcc->entry) {
532 printk(KERN_ERR "hiding hidden ATMARP entry\n");
533 return 0;
534 }
535 DPRINTK("setentry: remove\n");
536 unlink_clip_vcc(clip_vcc);
537 return 0;
538 }
539 error = ip_route_output_key(&rt,&fl);
540 if (error) return error;
541 neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
542 ip_rt_put(rt);
543 if (!neigh)
544 return -ENOMEM;
545 entry = NEIGH2ENTRY(neigh);
546 if (entry != clip_vcc->entry) {
547 if (!clip_vcc->entry) DPRINTK("setentry: add\n");
548 else {
549 DPRINTK("setentry: update\n");
550 unlink_clip_vcc(clip_vcc);
551 }
552 link_vcc(clip_vcc,entry);
553 }
554 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
555 NEIGH_UPDATE_F_OVERRIDE|NEIGH_UPDATE_F_ADMIN);
556 neigh_release(neigh);
557 return error;
558}
559
560
561static void clip_setup(struct net_device *dev)
562{
563 dev->hard_start_xmit = clip_start_xmit;
564 /* sg_xmit ... */
565 dev->get_stats = clip_get_stats;
566 dev->type = ARPHRD_ATM;
567 dev->hard_header_len = RFC1483LLC_LEN;
568 dev->mtu = RFC1626_MTU;
569 dev->tx_queue_len = 100; /* "normal" queue (packets) */
570 /* When using a "real" qdisc, the qdisc determines the queue */
571 /* length. tx_queue_len is only used for the default case, */
572 /* without any more elaborate queuing. 100 is a reasonable */
573 /* compromise between decent burst-tolerance and protection */
574 /* against memory hogs. */
575}
576
577
578static int clip_create(int number)
579{
580 struct net_device *dev;
581 struct clip_priv *clip_priv;
582 int error;
583
584 if (number != -1) {
585 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
586 if (PRIV(dev)->number == number) return -EEXIST;
587 }
588 else {
589 number = 0;
590 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
591 if (PRIV(dev)->number >= number)
592 number = PRIV(dev)->number+1;
593 }
594 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
595 if (!dev)
596 return -ENOMEM;
597 clip_priv = PRIV(dev);
598 sprintf(dev->name,"atm%d",number);
599 spin_lock_init(&clip_priv->xoff_lock);
600 clip_priv->number = number;
601 error = register_netdev(dev);
602 if (error) {
603 free_netdev(dev);
604 return error;
605 }
606 clip_priv->next = clip_devs;
607 clip_devs = dev;
608 DPRINTK("registered (net:%s)\n",dev->name);
609 return number;
610}
611
612
613static int clip_device_event(struct notifier_block *this,unsigned long event,
f3a0592b 614 void *arg)
1da177e4 615{
f3a0592b
SH		 616 struct net_device *dev = arg;
617
618 if (event == NETDEV_UNREGISTER) {
619 neigh_ifdown(&clip_tbl, dev);
620 return NOTIFY_DONE;
621 }
622
1da177e4 623 /* ignore non-CLIP devices */
f3a0592b 624 if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit)
1da177e4 625 return NOTIFY_DONE;
f3a0592b 626
1da177e4
LT		 627 switch (event) {
628 case NETDEV_UP:
629 DPRINTK("clip_device_event NETDEV_UP\n");
630 (void) to_atmarpd(act_up,PRIV(dev)->number,0);
631 break;
632 case NETDEV_GOING_DOWN:
633 DPRINTK("clip_device_event NETDEV_DOWN\n");
634 (void) to_atmarpd(act_down,PRIV(dev)->number,0);
635 break;
636 case NETDEV_CHANGE:
637 case NETDEV_CHANGEMTU:
638 DPRINTK("clip_device_event NETDEV_CHANGE*\n");
639 (void) to_atmarpd(act_change,PRIV(dev)->number,0);
640 break;
641 case NETDEV_REBOOT:
642 case NETDEV_REGISTER:
643 case NETDEV_DOWN:
644 DPRINTK("clip_device_event %ld\n",event);
645 /* ignore */
646 break;
647 default:
648 printk(KERN_WARNING "clip_device_event: unknown event "
649 "%ld\n",event);
650 break;
651 }
652 return NOTIFY_DONE;
653}
654
655
656static int clip_inet_event(struct notifier_block *this,unsigned long event,
657 void *ifa)
658{
659 struct in_device *in_dev;
660
661 in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
662 if (!in_dev || !in_dev->dev) {
663 printk(KERN_WARNING "clip_inet_event: no device\n");
664 return NOTIFY_DONE;
665 }
666 /*
667 * Transitions are of the down-change-up type, so it's sufficient to
668 * handle the change on up.
669 */
670 if (event != NETDEV_UP) return NOTIFY_DONE;
671 return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
672}
673
674
675static struct notifier_block clip_dev_notifier = {
676 clip_device_event,
677 NULL,
678 0
679};
680
681
682
683static struct notifier_block clip_inet_notifier = {
684 clip_inet_event,
685 NULL,
686 0
687};
688
689
690
691static void atmarpd_close(struct atm_vcc *vcc)
692{
693 DPRINTK("atmarpd_close\n");
f3a0592b
SH		 694
695 rtnl_lock();
696 atmarpd = NULL;
1da177e4 697 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
f3a0592b
SH		 698 rtnl_unlock();
699
1da177e4
LT		 700 DPRINTK("(done)\n");
701 module_put(THIS_MODULE);
702}
703
704
705static struct atmdev_ops atmarpd_dev_ops = {
706 .close = atmarpd_close
707};
708
709
710static struct atm_dev atmarpd_dev = {
711 .ops = &atmarpd_dev_ops,
712 .type = "arpd",
713 .number = 999,
714 .lock = SPIN_LOCK_UNLOCKED
715};
716
717
718static int atm_init_atmarp(struct atm_vcc *vcc)
719{
f3a0592b
SH		 720 rtnl_lock();
721 if (atmarpd) {
722 rtnl_unlock();
723 return -EADDRINUSE;
724 }
725
2d907392
SH		 726 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
727
1da177e4
LT		 728 atmarpd = vcc;
729 set_bit(ATM_VF_META,&vcc->flags);
730 set_bit(ATM_VF_READY,&vcc->flags);
731 /* allow replies and avoid getting closed if signaling dies */
732 vcc->dev = &atmarpd_dev;
733 vcc_insert_socket(sk_atm(vcc));
734 vcc->push = NULL;
735 vcc->pop = NULL; /* crash */
736 vcc->push_oam = NULL; /* crash */
f3a0592b 737 rtnl_unlock();
1da177e4
LT		 738 return 0;
739}
740
741static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
742{
743 struct atm_vcc *vcc = ATM_SD(sock);
744 int err = 0;
745
746 switch (cmd) {
747 case SIOCMKCLIP:
748 case ATMARPD_CTRL:
749 case ATMARP_MKIP:
750 case ATMARP_SETENTRY:
751 case ATMARP_ENCAP:
752 if (!capable(CAP_NET_ADMIN))
753 return -EPERM;
754 break;
755 default:
756 return -ENOIOCTLCMD;
757 }
758
759 switch (cmd) {
760 case SIOCMKCLIP:
761 err = clip_create(arg);
762 break;
763 case ATMARPD_CTRL:
764 err = atm_init_atmarp(vcc);
765 if (!err) {
766 sock->state = SS_CONNECTED;
767 __module_get(THIS_MODULE);
768 }
769 break;
770 case ATMARP_MKIP:
771 err = clip_mkip(vcc ,arg);
772 break;
773 case ATMARP_SETENTRY:
774 err = clip_setentry(vcc, arg);
775 break;
776 case ATMARP_ENCAP:
777 err = clip_encap(vcc, arg);
778 break;
779 }
780 return err;
781}
782
783static struct atm_ioctl clip_ioctl_ops = {
784 .owner = THIS_MODULE,
785 .ioctl = clip_ioctl,
786};
787
788#ifdef CONFIG_PROC_FS
789
790static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
791{
792 static int code[] = { 1,2,10,6,1,0 };
793 static int e164[] = { 1,8,4,6,1,0 };
794
795 if (*addr->sas_addr.pub) {
796 seq_printf(seq, "%s", addr->sas_addr.pub);
797 if (*addr->sas_addr.prv)
798 seq_putc(seq, '+');
799 } else if (!*addr->sas_addr.prv) {
800 seq_printf(seq, "%s", "(none)");
801 return;
802 }
803 if (*addr->sas_addr.prv) {
804 unsigned char *prv = addr->sas_addr.prv;
805 int *fields;
806 int i, j;
807
808 fields = *prv == ATM_AFI_E164 ? e164 : code;
809 for (i = 0; fields[i]; i++) {
810 for (j = fields[i]; j; j--)
811 seq_printf(seq, "%02X", *prv++);
812 if (fields[i+1])
813 seq_putc(seq, '.');
814 }
815 }
816}
817
818/* This means the neighbour entry has no attached VCC objects. */
819#define SEQ_NO_VCC_TOKEN ((void *) 2)
820
821static void atmarp_info(struct seq_file *seq, struct net_device *dev,
822 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
823{
824 unsigned long exp;
825 char buf[17];
826 int svc, llc, off;
827
828 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
829 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
830
831 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
832 clip_vcc->encap);
833
834 if (clip_vcc == SEQ_NO_VCC_TOKEN)
835 exp = entry->neigh->used;
836 else
837 exp = clip_vcc->last_use;
838
839 exp = (jiffies - exp) / HZ;
840
841 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
842 dev->name,
843 svc ? "SVC" : "PVC",
844 llc ? "LLC" : "NULL",
845 exp);
846
847 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d",
848 NIPQUAD(entry->ip));
849 while (off < 16)
850 buf[off++] = ' ';
851 buf[off] = '\0';
852 seq_printf(seq, "%s", buf);
853
854 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
855 if (time_before(jiffies, entry->expires))
856 seq_printf(seq, "(resolving)\n");
857 else
858 seq_printf(seq, "(expired, ref %d)\n",
859 atomic_read(&entry->neigh->refcnt));
860 } else if (!svc) {
861 seq_printf(seq, "%d.%d.%d\n",
862 clip_vcc->vcc->dev->number,
863 clip_vcc->vcc->vpi,
864 clip_vcc->vcc->vci);
865 } else {
866 svc_addr(seq, &clip_vcc->vcc->remote);
867 seq_putc(seq, '\n');
868 }
869}
870
871struct clip_seq_state {
872 /* This member must be first. */
873 struct neigh_seq_state ns;
874
875 /* Local to clip specific iteration. */
876 struct clip_vcc *vcc;
877};
878
879static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
880 struct clip_vcc *curr)
881{
882 if (!curr) {
883 curr = e->vccs;
884 if (!curr)
885 return SEQ_NO_VCC_TOKEN;
886 return curr;
887 }
888 if (curr == SEQ_NO_VCC_TOKEN)
889 return NULL;
890
891 curr = curr->next;
892
893 return curr;
894}
895
896static void *clip_seq_vcc_walk(struct clip_seq_state *state,
897 struct atmarp_entry *e, loff_t *pos)
898{
899 struct clip_vcc *vcc = state->vcc;
900
901 vcc = clip_seq_next_vcc(e, vcc);
902 if (vcc && pos != NULL) {
903 while (*pos) {
904 vcc = clip_seq_next_vcc(e, vcc);
905 if (!vcc)
906 break;
907 --(*pos);
908 }
909 }
910 state->vcc = vcc;
911
912 return vcc;
913}
914
915static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
916 struct neighbour *n, loff_t *pos)
917{
918 struct clip_seq_state *state = (struct clip_seq_state *) _state;
919
920 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
921}
922
923static void *clip_seq_start(struct seq_file *seq, loff_t *pos)
924{
925 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
926}
927
928static int clip_seq_show(struct seq_file *seq, void *v)
929{
930 static char atm_arp_banner[] =
931 "IPitf TypeEncp Idle IP address ATM address\n";
932
933 if (v == SEQ_START_TOKEN) {
934 seq_puts(seq, atm_arp_banner);
935 } else {
936 struct clip_seq_state *state = seq->private;
937 struct neighbour *n = v;
938 struct clip_vcc *vcc = state->vcc;
939
940 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
941 }
942 return 0;
943}
944
945static struct seq_operations arp_seq_ops = {
946 .start = clip_seq_start,
947 .next = neigh_seq_next,
948 .stop = neigh_seq_stop,
949 .show = clip_seq_show,
950};
951
952static int arp_seq_open(struct inode *inode, struct file *file)
953{
954 struct clip_seq_state *state;
955 struct seq_file *seq;
956 int rc = -EAGAIN;
957
958 state = kmalloc(sizeof(*state), GFP_KERNEL);
959 if (!state) {
960 rc = -ENOMEM;
961 goto out_kfree;
962 }
963 memset(state, 0, sizeof(*state));
964 state->ns.neigh_sub_iter = clip_seq_sub_iter;
965
966 rc = seq_open(file, &arp_seq_ops);
967 if (rc)
968 goto out_kfree;
969
970 seq = file->private_data;
971 seq->private = state;
972out:
973 return rc;
974
975out_kfree:
976 kfree(state);
977 goto out;
978}
979
980static struct file_operations arp_seq_fops = {
981 .open = arp_seq_open,
982 .read = seq_read,
983 .llseek = seq_lseek,
984 .release = seq_release_private,
985 .owner = THIS_MODULE
986};
987#endif
988
989static int __init atm_clip_init(void)
990{
991 neigh_table_init(&clip_tbl);
992
993 clip_tbl_hook = &clip_tbl;
994 register_atm_ioctl(&clip_ioctl_ops);
f3a0592b
SH		 995 register_netdevice_notifier(&clip_dev_notifier);
996 register_inetaddr_notifier(&clip_inet_notifier);
1da177e4 997
2d907392
SH		 998 setup_timer(&idle_timer, idle_timer_check, 0);
999
1da177e4
LT		 1000#ifdef CONFIG_PROC_FS
1001{
1002 struct proc_dir_entry *p;
1003
1004 p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
1005 if (p)
1006 p->proc_fops = &arp_seq_fops;
1007}
1008#endif
1009
1010 return 0;
1011}
1012
1013static void __exit atm_clip_exit(void)
1014{
1015 struct net_device *dev, *next;
1016
1017 remove_proc_entry("arp", atm_proc_root);
1018
f3a0592b
SH		 1019 unregister_inetaddr_notifier(&clip_inet_notifier);
1020 unregister_netdevice_notifier(&clip_dev_notifier);
1021
1da177e4
LT		 1022 deregister_atm_ioctl(&clip_ioctl_ops);
1023
1024 /* First, stop the idle timer, so it stops banging
1025 * on the table.
1026 */
2d907392 1027 del_timer_sync(&idle_timer);
1da177e4
LT		 1028
1029 /* Next, purge the table, so that the device
1030 * unregister loop below does not hang due to
1031 * device references remaining in the table.
1032 */
1033 neigh_ifdown(&clip_tbl, NULL);
1034
1035 dev = clip_devs;
1036 while (dev) {
1037 next = PRIV(dev)->next;
1038 unregister_netdev(dev);
1039 free_netdev(dev);
1040 dev = next;
1041 }
1042
1043 /* Now it is safe to fully shutdown whole table. */
1044 neigh_table_clear(&clip_tbl);
1045
1046 clip_tbl_hook = NULL;
1047}
1048
1049module_init(atm_clip_init);
1050module_exit(atm_clip_exit);
1051
1052MODULE_LICENSE("GPL");
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