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[XFRM]: Add documentation for async events.
[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;
57static int start_timer = 1;
58
59
60static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
61{
62 struct sock *sk;
63 struct atmarp_ctrl *ctrl;
64 struct sk_buff *skb;
65
66 DPRINTK("to_atmarpd(%d)\n",type);
67 if (!atmarpd) return -EUNATCH;
68 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
69 if (!skb) return -ENOMEM;
70 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
71 ctrl->type = type;
72 ctrl->itf_num = itf;
73 ctrl->ip = ip;
74 atm_force_charge(atmarpd,skb->truesize);
75
76 sk = sk_atm(atmarpd);
77 skb_queue_tail(&sk->sk_receive_queue, skb);
78 sk->sk_data_ready(sk, skb->len);
79 return 0;
80}
81
82
83static void link_vcc(struct clip_vcc *clip_vcc,struct atmarp_entry *entry)
84{
85 DPRINTK("link_vcc %p to entry %p (neigh %p)\n",clip_vcc,entry,
86 entry->neigh);
87 clip_vcc->entry = entry;
88 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
89 clip_vcc->next = entry->vccs;
90 entry->vccs = clip_vcc;
91 entry->neigh->used = jiffies;
92}
93
94
95static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
96{
97 struct atmarp_entry *entry = clip_vcc->entry;
98 struct clip_vcc **walk;
99
100 if (!entry) {
101 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n",clip_vcc);
102 return;
103 }
104 spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */
105 entry->neigh->used = jiffies;
106 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
107 if (*walk == clip_vcc) {
108 int error;
109
110 *walk = clip_vcc->next; /* atomic */
111 clip_vcc->entry = NULL;
112 if (clip_vcc->xoff)
113 netif_wake_queue(entry->neigh->dev);
114 if (entry->vccs)
115 goto out;
116 entry->expires = jiffies-1;
117 /* force resolution or expiration */
118 error = neigh_update(entry->neigh, NULL, NUD_NONE,
119 NEIGH_UPDATE_F_ADMIN);
120 if (error)
121 printk(KERN_CRIT "unlink_clip_vcc: "
122 "neigh_update failed with %d\n",error);
123 goto out;
124 }
125 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
126 "0x%p)\n",entry,clip_vcc);
127out:
128 spin_unlock_bh(&entry->neigh->dev->xmit_lock);
129}
130
131/* The neighbour entry n->lock is held. */
132static int neigh_check_cb(struct neighbour *n)
133{
134 struct atmarp_entry *entry = NEIGH2ENTRY(n);
135 struct clip_vcc *cv;
136
137 for (cv = entry->vccs; cv; cv = cv->next) {
138 unsigned long exp = cv->last_use + cv->idle_timeout;
139
140 if (cv->idle_timeout && time_after(jiffies, exp)) {
141 DPRINTK("releasing vcc %p->%p of entry %p\n",
142 cv, cv->vcc, entry);
143 vcc_release_async(cv->vcc, -ETIMEDOUT);
144 }
145 }
146
147 if (entry->vccs || time_before(jiffies, entry->expires))
148 return 0;
149
150 if (atomic_read(&n->refcnt) > 1) {
151 struct sk_buff *skb;
152
153 DPRINTK("destruction postponed with ref %d\n",
154 atomic_read(&n->refcnt));
155
156 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
157 dev_kfree_skb(skb);
158
159 return 0;
160 }
161
162 DPRINTK("expired neigh %p\n",n);
163 return 1;
164}
165
166static void idle_timer_check(unsigned long dummy)
167{
168 write_lock(&clip_tbl.lock);
169 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
170 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
171 write_unlock(&clip_tbl.lock);
172}
173
174static int clip_arp_rcv(struct sk_buff *skb)
175{
176 struct atm_vcc *vcc;
177
178 DPRINTK("clip_arp_rcv\n");
179 vcc = ATM_SKB(skb)->vcc;
180 if (!vcc || !atm_charge(vcc,skb->truesize)) {
181 dev_kfree_skb_any(skb);
182 return 0;
183 }
184 DPRINTK("pushing to %p\n",vcc);
185 DPRINTK("using %p\n",CLIP_VCC(vcc)->old_push);
186 CLIP_VCC(vcc)->old_push(vcc,skb);
187 return 0;
188}
189
190static const unsigned char llc_oui[] = {
191 0xaa, /* DSAP: non-ISO */
192 0xaa, /* SSAP: non-ISO */
193 0x03, /* Ctrl: Unnumbered Information Command PDU */
194 0x00, /* OUI: EtherType */
195 0x00,
196 0x00 };
197
198static void clip_push(struct atm_vcc *vcc,struct sk_buff *skb)
199{
200 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
201
202 DPRINTK("clip push\n");
203 if (!skb) {
204 DPRINTK("removing VCC %p\n",clip_vcc);
205 if (clip_vcc->entry) unlink_clip_vcc(clip_vcc);
206 clip_vcc->old_push(vcc,NULL); /* pass on the bad news */
207 kfree(clip_vcc);
208 return;
209 }
210 atm_return(vcc,skb->truesize);
211 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
212 /* clip_vcc->entry == NULL if we don't have an IP address yet */
213 if (!skb->dev) {
214 dev_kfree_skb_any(skb);
215 return;
216 }
217 ATM_SKB(skb)->vcc = vcc;
218 skb->mac.raw = skb->data;
219 if (!clip_vcc->encap || skb->len < RFC1483LLC_LEN || memcmp(skb->data,
220 llc_oui,sizeof(llc_oui))) skb->protocol = htons(ETH_P_IP);
221 else {
222 skb->protocol = ((u16 *) skb->data)[3];
223 skb_pull(skb,RFC1483LLC_LEN);
224 if (skb->protocol == htons(ETH_P_ARP)) {
225 PRIV(skb->dev)->stats.rx_packets++;
226 PRIV(skb->dev)->stats.rx_bytes += skb->len;
227 clip_arp_rcv(skb);
228 return;
229 }
230 }
231 clip_vcc->last_use = jiffies;
232 PRIV(skb->dev)->stats.rx_packets++;
233 PRIV(skb->dev)->stats.rx_bytes += skb->len;
234 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
235 netif_rx(skb);
236}
237
238
239/*
240 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
241 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
242 */
243
244
245static void clip_pop(struct atm_vcc *vcc,struct sk_buff *skb)
246{
247 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
248 struct net_device *dev = skb->dev;
249 int old;
250 unsigned long flags;
251
252 DPRINTK("clip_pop(vcc %p)\n",vcc);
253 clip_vcc->old_pop(vcc,skb);
254 /* skb->dev == NULL in outbound ARP packets */
255 if (!dev) return;
256 spin_lock_irqsave(&PRIV(dev)->xoff_lock,flags);
257 if (atm_may_send(vcc,0)) {
258 old = xchg(&clip_vcc->xoff,0);
259 if (old) netif_wake_queue(dev);
260 }
261 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock,flags);
262}
263
264
265static void clip_neigh_destroy(struct neighbour *neigh)
266{
267 DPRINTK("clip_neigh_destroy (neigh %p)\n",neigh);
268 if (NEIGH2ENTRY(neigh)->vccs)
269 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
270 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
271}
272
273
274static void clip_neigh_solicit(struct neighbour *neigh,struct sk_buff *skb)
275{
276 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n",neigh,skb);
277 to_atmarpd(act_need,PRIV(neigh->dev)->number,NEIGH2ENTRY(neigh)->ip);
278}
279
280
281static void clip_neigh_error(struct neighbour *neigh,struct sk_buff *skb)
282{
283#ifndef CONFIG_ATM_CLIP_NO_ICMP
284 icmp_send(skb,ICMP_DEST_UNREACH,ICMP_HOST_UNREACH,0);
285#endif
286 kfree_skb(skb);
287}
288
289
290static struct neigh_ops clip_neigh_ops = {
291 .family = AF_INET,
1da177e4
LT		 292 .solicit = clip_neigh_solicit,
293 .error_report = clip_neigh_error,
294 .output = dev_queue_xmit,
295 .connected_output = dev_queue_xmit,
296 .hh_output = dev_queue_xmit,
297 .queue_xmit = dev_queue_xmit,
298};
299
300
301static int clip_constructor(struct neighbour *neigh)
302{
303 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
304 struct net_device *dev = neigh->dev;
305 struct in_device *in_dev;
306 struct neigh_parms *parms;
307
308 DPRINTK("clip_constructor (neigh %p, entry %p)\n",neigh,entry);
309 neigh->type = inet_addr_type(entry->ip);
310 if (neigh->type != RTN_UNICAST) return -EINVAL;
311
312 rcu_read_lock();
e5ed6399 313 in_dev = __in_dev_get_rcu(dev);
1da177e4
LT		 314 if (!in_dev) {
315 rcu_read_unlock();
316 return -EINVAL;
317 }
318
319 parms = in_dev->arp_parms;
320 __neigh_parms_put(neigh->parms);
321 neigh->parms = neigh_parms_clone(parms);
322 rcu_read_unlock();
323
324 neigh->ops = &clip_neigh_ops;
325 neigh->output = neigh->nud_state & NUD_VALID ?
326 neigh->ops->connected_output : neigh->ops->output;
327 entry->neigh = neigh;
328 entry->vccs = NULL;
329 entry->expires = jiffies-1;
330 return 0;
331}
332
333static u32 clip_hash(const void *pkey, const struct net_device *dev)
334{
335 return jhash_2words(*(u32 *)pkey, dev->ifindex, clip_tbl.hash_rnd);
336}
337
338static struct neigh_table clip_tbl = {
339 .family = AF_INET,
340 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
341 .key_len = 4,
342 .hash = clip_hash,
343 .constructor = clip_constructor,
344 .id = "clip_arp_cache",
345
346 /* parameters are copied from ARP ... */
347 .parms = {
348 .tbl = &clip_tbl,
aa837b5b 349 .neigh_destructor = clip_neigh_destroy,
1da177e4
LT		 350 .base_reachable_time = 30 * HZ,
351 .retrans_time = 1 * HZ,
352 .gc_staletime = 60 * HZ,
353 .reachable_time = 30 * HZ,
354 .delay_probe_time = 5 * HZ,
355 .queue_len = 3,
356 .ucast_probes = 3,
357 .mcast_probes = 3,
358 .anycast_delay = 1 * HZ,
359 .proxy_delay = (8 * HZ) / 10,
360 .proxy_qlen = 64,
361 .locktime = 1 * HZ,
362 },
363 .gc_interval = 30 * HZ,
364 .gc_thresh1 = 128,
365 .gc_thresh2 = 512,
366 .gc_thresh3 = 1024,
367};
368
369
370/* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
371
372/*
373 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
374 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
375 * don't increment the usage count. This is used to create entries in
376 * clip_setentry.
377 */
378
379
380static int clip_encap(struct atm_vcc *vcc,int mode)
381{
382 CLIP_VCC(vcc)->encap = mode;
383 return 0;
384}
385
386
387static int clip_start_xmit(struct sk_buff *skb,struct net_device *dev)
388{
389 struct clip_priv *clip_priv = PRIV(dev);
390 struct atmarp_entry *entry;
391 struct atm_vcc *vcc;
392 int old;
393 unsigned long flags;
394
395 DPRINTK("clip_start_xmit (skb %p)\n",skb);
396 if (!skb->dst) {
397 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
398 dev_kfree_skb(skb);
399 clip_priv->stats.tx_dropped++;
400 return 0;
401 }
402 if (!skb->dst->neighbour) {
403#if 0
404 skb->dst->neighbour = clip_find_neighbour(skb->dst,1);
405 if (!skb->dst->neighbour) {
406 dev_kfree_skb(skb); /* lost that one */
407 clip_priv->stats.tx_dropped++;
408 return 0;
409 }
410#endif
411 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
412 dev_kfree_skb(skb);
413 clip_priv->stats.tx_dropped++;
414 return 0;
415 }
416 entry = NEIGH2ENTRY(skb->dst->neighbour);
417 if (!entry->vccs) {
418 if (time_after(jiffies, entry->expires)) {
419 /* should be resolved */
420 entry->expires = jiffies+ATMARP_RETRY_DELAY*HZ;
421 to_atmarpd(act_need,PRIV(dev)->number,entry->ip);
422 }
423 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
424 skb_queue_tail(&entry->neigh->arp_queue,skb);
425 else {
426 dev_kfree_skb(skb);
427 clip_priv->stats.tx_dropped++;
428 }
429 return 0;
430 }
431 DPRINTK("neigh %p, vccs %p\n",entry,entry->vccs);
432 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
433 DPRINTK("using neighbour %p, vcc %p\n",skb->dst->neighbour,vcc);
434 if (entry->vccs->encap) {
435 void *here;
436
437 here = skb_push(skb,RFC1483LLC_LEN);
438 memcpy(here,llc_oui,sizeof(llc_oui));
439 ((u16 *) here)[3] = skb->protocol;
440 }
441 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
442 ATM_SKB(skb)->atm_options = vcc->atm_options;
443 entry->vccs->last_use = jiffies;
444 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n",skb,vcc,vcc->dev);
445 old = xchg(&entry->vccs->xoff,1); /* assume XOFF ... */
446 if (old) {
447 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
448 return 0;
449 }
450 clip_priv->stats.tx_packets++;
451 clip_priv->stats.tx_bytes += skb->len;
452 (void) vcc->send(vcc,skb);
453 if (atm_may_send(vcc,0)) {
454 entry->vccs->xoff = 0;
455 return 0;
456 }
457 spin_lock_irqsave(&clip_priv->xoff_lock,flags);
458 netif_stop_queue(dev); /* XOFF -> throttle immediately */
459 barrier();
460 if (!entry->vccs->xoff)
461 netif_start_queue(dev);
462 /* Oh, we just raced with clip_pop. netif_start_queue should be
463 good enough, because nothing should really be asleep because
464 of the brief netif_stop_queue. If this isn't true or if it
465 changes, use netif_wake_queue instead. */
466 spin_unlock_irqrestore(&clip_priv->xoff_lock,flags);
467 return 0;
468}
469
470
471static struct net_device_stats *clip_get_stats(struct net_device *dev)
472{
473 return &PRIV(dev)->stats;
474}
475
476
477static int clip_mkip(struct atm_vcc *vcc,int timeout)
478{
479 struct clip_vcc *clip_vcc;
480 struct sk_buff_head copy;
481 struct sk_buff *skb;
482
483 if (!vcc->push) return -EBADFD;
484 clip_vcc = kmalloc(sizeof(struct clip_vcc),GFP_KERNEL);
485 if (!clip_vcc) return -ENOMEM;
486 DPRINTK("mkip clip_vcc %p vcc %p\n",clip_vcc,vcc);
487 clip_vcc->vcc = vcc;
488 vcc->user_back = clip_vcc;
489 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
490 clip_vcc->entry = NULL;
491 clip_vcc->xoff = 0;
492 clip_vcc->encap = 1;
493 clip_vcc->last_use = jiffies;
494 clip_vcc->idle_timeout = timeout*HZ;
495 clip_vcc->old_push = vcc->push;
496 clip_vcc->old_pop = vcc->pop;
497 vcc->push = clip_push;
498 vcc->pop = clip_pop;
499 skb_queue_head_init(&copy);
500 skb_migrate(&sk_atm(vcc)->sk_receive_queue, &copy);
501 /* re-process everything received between connection setup and MKIP */
502 while ((skb = skb_dequeue(&copy)) != NULL)
503 if (!clip_devs) {
504 atm_return(vcc,skb->truesize);
505 kfree_skb(skb);
506 }
507 else {
508 unsigned int len = skb->len;
509
510 clip_push(vcc,skb);
511 PRIV(skb->dev)->stats.rx_packets--;
512 PRIV(skb->dev)->stats.rx_bytes -= len;
513 }
514 return 0;
515}
516
517
518static int clip_setentry(struct atm_vcc *vcc,u32 ip)
519{
520 struct neighbour *neigh;
521 struct atmarp_entry *entry;
522 int error;
523 struct clip_vcc *clip_vcc;
524 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1 } } };
525 struct rtable *rt;
526
527 if (vcc->push != clip_push) {
528 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
529 return -EBADF;
530 }
531 clip_vcc = CLIP_VCC(vcc);
532 if (!ip) {
533 if (!clip_vcc->entry) {
534 printk(KERN_ERR "hiding hidden ATMARP entry\n");
535 return 0;
536 }
537 DPRINTK("setentry: remove\n");
538 unlink_clip_vcc(clip_vcc);
539 return 0;
540 }
541 error = ip_route_output_key(&rt,&fl);
542 if (error) return error;
543 neigh = __neigh_lookup(&clip_tbl,&ip,rt->u.dst.dev,1);
544 ip_rt_put(rt);
545 if (!neigh)
546 return -ENOMEM;
547 entry = NEIGH2ENTRY(neigh);
548 if (entry != clip_vcc->entry) {
549 if (!clip_vcc->entry) DPRINTK("setentry: add\n");
550 else {
551 DPRINTK("setentry: update\n");
552 unlink_clip_vcc(clip_vcc);
553 }
554 link_vcc(clip_vcc,entry);
555 }
556 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
557 NEIGH_UPDATE_F_OVERRIDE|NEIGH_UPDATE_F_ADMIN);
558 neigh_release(neigh);
559 return error;
560}
561
562
563static void clip_setup(struct net_device *dev)
564{
565 dev->hard_start_xmit = clip_start_xmit;
566 /* sg_xmit ... */
567 dev->get_stats = clip_get_stats;
568 dev->type = ARPHRD_ATM;
569 dev->hard_header_len = RFC1483LLC_LEN;
570 dev->mtu = RFC1626_MTU;
571 dev->tx_queue_len = 100; /* "normal" queue (packets) */
572 /* When using a "real" qdisc, the qdisc determines the queue */
573 /* length. tx_queue_len is only used for the default case, */
574 /* without any more elaborate queuing. 100 is a reasonable */
575 /* compromise between decent burst-tolerance and protection */
576 /* against memory hogs. */
577}
578
579
580static int clip_create(int number)
581{
582 struct net_device *dev;
583 struct clip_priv *clip_priv;
584 int error;
585
586 if (number != -1) {
587 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
588 if (PRIV(dev)->number == number) return -EEXIST;
589 }
590 else {
591 number = 0;
592 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
593 if (PRIV(dev)->number >= number)
594 number = PRIV(dev)->number+1;
595 }
596 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
597 if (!dev)
598 return -ENOMEM;
599 clip_priv = PRIV(dev);
600 sprintf(dev->name,"atm%d",number);
601 spin_lock_init(&clip_priv->xoff_lock);
602 clip_priv->number = number;
603 error = register_netdev(dev);
604 if (error) {
605 free_netdev(dev);
606 return error;
607 }
608 clip_priv->next = clip_devs;
609 clip_devs = dev;
610 DPRINTK("registered (net:%s)\n",dev->name);
611 return number;
612}
613
614
615static int clip_device_event(struct notifier_block *this,unsigned long event,
616 void *dev)
617{
618 /* ignore non-CLIP devices */
619 if (((struct net_device *) dev)->type != ARPHRD_ATM ||
620 ((struct net_device *) dev)->hard_start_xmit != clip_start_xmit)
621 return NOTIFY_DONE;
622 switch (event) {
623 case NETDEV_UP:
624 DPRINTK("clip_device_event NETDEV_UP\n");
625 (void) to_atmarpd(act_up,PRIV(dev)->number,0);
626 break;
627 case NETDEV_GOING_DOWN:
628 DPRINTK("clip_device_event NETDEV_DOWN\n");
629 (void) to_atmarpd(act_down,PRIV(dev)->number,0);
630 break;
631 case NETDEV_CHANGE:
632 case NETDEV_CHANGEMTU:
633 DPRINTK("clip_device_event NETDEV_CHANGE*\n");
634 (void) to_atmarpd(act_change,PRIV(dev)->number,0);
635 break;
636 case NETDEV_REBOOT:
637 case NETDEV_REGISTER:
638 case NETDEV_DOWN:
639 DPRINTK("clip_device_event %ld\n",event);
640 /* ignore */
641 break;
642 default:
643 printk(KERN_WARNING "clip_device_event: unknown event "
644 "%ld\n",event);
645 break;
646 }
647 return NOTIFY_DONE;
648}
649
650
651static int clip_inet_event(struct notifier_block *this,unsigned long event,
652 void *ifa)
653{
654 struct in_device *in_dev;
655
656 in_dev = ((struct in_ifaddr *) ifa)->ifa_dev;
657 if (!in_dev || !in_dev->dev) {
658 printk(KERN_WARNING "clip_inet_event: no device\n");
659 return NOTIFY_DONE;
660 }
661 /*
662 * Transitions are of the down-change-up type, so it's sufficient to
663 * handle the change on up.
664 */
665 if (event != NETDEV_UP) return NOTIFY_DONE;
666 return clip_device_event(this,NETDEV_CHANGE,in_dev->dev);
667}
668
669
670static struct notifier_block clip_dev_notifier = {
671 clip_device_event,
672 NULL,
673 0
674};
675
676
677
678static struct notifier_block clip_inet_notifier = {
679 clip_inet_event,
680 NULL,
681 0
682};
683
684
685
686static void atmarpd_close(struct atm_vcc *vcc)
687{
688 DPRINTK("atmarpd_close\n");
689 atmarpd = NULL; /* assumed to be atomic */
690 barrier();
691 unregister_inetaddr_notifier(&clip_inet_notifier);
692 unregister_netdevice_notifier(&clip_dev_notifier);
693 if (skb_peek(&sk_atm(vcc)->sk_receive_queue))
694 printk(KERN_ERR "atmarpd_close: closing with requests "
695 "pending\n");
696 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
697 DPRINTK("(done)\n");
698 module_put(THIS_MODULE);
699}
700
701
702static struct atmdev_ops atmarpd_dev_ops = {
703 .close = atmarpd_close
704};
705
706
707static struct atm_dev atmarpd_dev = {
708 .ops = &atmarpd_dev_ops,
709 .type = "arpd",
710 .number = 999,
711 .lock = SPIN_LOCK_UNLOCKED
712};
713
714
715static int atm_init_atmarp(struct atm_vcc *vcc)
716{
717 if (atmarpd) return -EADDRINUSE;
718 if (start_timer) {
719 start_timer = 0;
720 init_timer(&idle_timer);
721 idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
722 idle_timer.function = idle_timer_check;
723 add_timer(&idle_timer);
724 }
725 atmarpd = vcc;
726 set_bit(ATM_VF_META,&vcc->flags);
727 set_bit(ATM_VF_READY,&vcc->flags);
728 /* allow replies and avoid getting closed if signaling dies */
729 vcc->dev = &atmarpd_dev;
730 vcc_insert_socket(sk_atm(vcc));
731 vcc->push = NULL;
732 vcc->pop = NULL; /* crash */
733 vcc->push_oam = NULL; /* crash */
734 if (register_netdevice_notifier(&clip_dev_notifier))
735 printk(KERN_ERR "register_netdevice_notifier failed\n");
736 if (register_inetaddr_notifier(&clip_inet_notifier))
737 printk(KERN_ERR "register_inetaddr_notifier failed\n");
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);
995
996#ifdef CONFIG_PROC_FS
997{
998 struct proc_dir_entry *p;
999
1000 p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
1001 if (p)
1002 p->proc_fops = &arp_seq_fops;
1003}
1004#endif
1005
1006 return 0;
1007}
1008
1009static void __exit atm_clip_exit(void)
1010{
1011 struct net_device *dev, *next;
1012
1013 remove_proc_entry("arp", atm_proc_root);
1014
1015 deregister_atm_ioctl(&clip_ioctl_ops);
1016
1017 /* First, stop the idle timer, so it stops banging
1018 * on the table.
1019 */
1020 if (start_timer == 0)
1021 del_timer(&idle_timer);
1022
1023 /* Next, purge the table, so that the device
1024 * unregister loop below does not hang due to
1025 * device references remaining in the table.
1026 */
1027 neigh_ifdown(&clip_tbl, NULL);
1028
1029 dev = clip_devs;
1030 while (dev) {
1031 next = PRIV(dev)->next;
1032 unregister_netdev(dev);
1033 free_netdev(dev);
1034 dev = next;
1035 }
1036
1037 /* Now it is safe to fully shutdown whole table. */
1038 neigh_table_clear(&clip_tbl);
1039
1040 clip_tbl_hook = NULL;
1041}
1042
1043module_init(atm_clip_init);
1044module_exit(atm_clip_exit);
1045
1046MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree