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