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NFS: Make better use of inode* dereferencing macros
[wrt350n-kernel.git] / net / atm / clip.c
blob7af2c411da82031f1f62599b5050fe30296f0622
1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5 #include <linux/string.h>
6 #include <linux/errno.h>
7 #include <linux/kernel.h> /* for UINT_MAX */
8 #include <linux/module.h>
9 #include <linux/init.h>
10 #include <linux/netdevice.h>
11 #include <linux/skbuff.h>
12 #include <linux/wait.h>
13 #include <linux/timer.h>
14 #include <linux/if_arp.h> /* for some manifest constants */
15 #include <linux/notifier.h>
16 #include <linux/atm.h>
17 #include <linux/atmdev.h>
18 #include <linux/atmclip.h>
19 #include <linux/atmarp.h>
20 #include <linux/capability.h>
21 #include <linux/ip.h> /* for net/route.h */
22 #include <linux/in.h> /* for struct sockaddr_in */
23 #include <linux/if.h> /* for IFF_UP */
24 #include <linux/inetdevice.h>
25 #include <linux/bitops.h>
26 #include <linux/poison.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
57 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, unsigned long ip)
58 {
59 struct sock *sk;
60 struct atmarp_ctrl *ctrl;
61 struct sk_buff *skb;
62
63 DPRINTK("to_atmarpd(%d)\n", type);
64 if (!atmarpd)
65 return -EUNATCH;
66 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
67 if (!skb)
68 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 static 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 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
93 {
94 struct atmarp_entry *entry = clip_vcc->entry;
95 struct clip_vcc **walk;
96
97 if (!entry) {
98 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
99 return;
100 }
101 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
102 entry->neigh->used = jiffies;
103 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
104 if (*walk == clip_vcc) {
105 int error;
106
107 *walk = clip_vcc->next; /* atomic */
108 clip_vcc->entry = NULL;
109 if (clip_vcc->xoff)
110 netif_wake_queue(entry->neigh->dev);
111 if (entry->vccs)
112 goto out;
113 entry->expires = jiffies - 1;
114 /* force resolution or expiration */
115 error = neigh_update(entry->neigh, NULL, NUD_NONE,
116 NEIGH_UPDATE_F_ADMIN);
117 if (error)
118 printk(KERN_CRIT "unlink_clip_vcc: "
119 "neigh_update failed with %d\n", error);
120 goto out;
121 }
122 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
123 "0x%p)\n", entry, clip_vcc);
124 out:
125 netif_tx_unlock_bh(entry->neigh->dev);
126 }
127
128 /* The neighbour entry n->lock is held. */
129 static int neigh_check_cb(struct neighbour *n)
130 {
131 struct atmarp_entry *entry = NEIGH2ENTRY(n);
132 struct clip_vcc *cv;
133
134 for (cv = entry->vccs; cv; cv = cv->next) {
135 unsigned long exp = cv->last_use + cv->idle_timeout;
136
137 if (cv->idle_timeout && time_after(jiffies, exp)) {
138 DPRINTK("releasing vcc %p->%p of entry %p\n",
139 cv, cv->vcc, entry);
140 vcc_release_async(cv->vcc, -ETIMEDOUT);
141 }
142 }
143
144 if (entry->vccs || time_before(jiffies, entry->expires))
145 return 0;
146
147 if (atomic_read(&n->refcnt) > 1) {
148 struct sk_buff *skb;
149
150 DPRINTK("destruction postponed with ref %d\n",
151 atomic_read(&n->refcnt));
152
153 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
154 dev_kfree_skb(skb);
155
156 return 0;
157 }
158
159 DPRINTK("expired neigh %p\n", n);
160 return 1;
161 }
162
163 static void idle_timer_check(unsigned long dummy)
164 {
165 write_lock(&clip_tbl.lock);
166 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
167 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
168 write_unlock(&clip_tbl.lock);
169 }
170
171 static int clip_arp_rcv(struct sk_buff *skb)
172 {
173 struct atm_vcc *vcc;
174
175 DPRINTK("clip_arp_rcv\n");
176 vcc = ATM_SKB(skb)->vcc;
177 if (!vcc || !atm_charge(vcc, skb->truesize)) {
178 dev_kfree_skb_any(skb);
179 return 0;
180 }
181 DPRINTK("pushing to %p\n", vcc);
182 DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push);
183 CLIP_VCC(vcc)->old_push(vcc, skb);
184 return 0;
185 }
186
187 static const unsigned char llc_oui[] = {
188 0xaa, /* DSAP: non-ISO */
189 0xaa, /* SSAP: non-ISO */
190 0x03, /* Ctrl: Unnumbered Information Command PDU */
191 0x00, /* OUI: EtherType */
192 0x00,
193 0x00
194 };
195
196 static 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)
204 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
219 || skb->len < RFC1483LLC_LEN
220 || memcmp(skb->data, llc_oui, sizeof (llc_oui)))
221 skb->protocol = htons(ETH_P_IP);
222 else {
223 skb->protocol = ((u16 *) skb->data)[3];
224 skb_pull(skb, RFC1483LLC_LEN);
225 if (skb->protocol == htons(ETH_P_ARP)) {
226 PRIV(skb->dev)->stats.rx_packets++;
227 PRIV(skb->dev)->stats.rx_bytes += skb->len;
228 clip_arp_rcv(skb);
229 return;
230 }
231 }
232 clip_vcc->last_use = jiffies;
233 PRIV(skb->dev)->stats.rx_packets++;
234 PRIV(skb->dev)->stats.rx_bytes += skb->len;
235 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
236 netif_rx(skb);
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 static 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)
255 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)
260 netif_wake_queue(dev);
261 }
262 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
263 }
264
265 static 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 *) NEIGHBOR_DEAD;
271 }
272
273 static 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 static 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 static struct neigh_ops clip_neigh_ops = {
288 .family = AF_INET,
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 static int clip_constructor(struct neighbour *neigh)
298 {
299 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
300 struct net_device *dev = neigh->dev;
301 struct in_device *in_dev;
302 struct neigh_parms *parms;
303
304 DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry);
305 neigh->type = inet_addr_type(entry->ip);
306 if (neigh->type != RTN_UNICAST)
307 return -EINVAL;
308
309 rcu_read_lock();
310 in_dev = __in_dev_get_rcu(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 .neigh_destructor = clip_neigh_destroy,
347 .base_reachable_time = 30 * HZ,
348 .retrans_time = 1 * HZ,
349 .gc_staletime = 60 * HZ,
350 .reachable_time = 30 * HZ,
351 .delay_probe_time = 5 * HZ,
352 .queue_len = 3,
353 .ucast_probes = 3,
354 .mcast_probes = 3,
355 .anycast_delay = 1 * HZ,
356 .proxy_delay = (8 * HZ) / 10,
357 .proxy_qlen = 64,
358 .locktime = 1 * HZ,
359 },
360 .gc_interval = 30 * HZ,
361 .gc_thresh1 = 128,
362 .gc_thresh2 = 512,
363 .gc_thresh3 = 1024,
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 static int clip_encap(struct atm_vcc *vcc, int mode)
376 {
377 CLIP_VCC(vcc)->encap = mode;
378 return 0;
379 }
380
381 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev)
382 {
383 struct clip_priv *clip_priv = PRIV(dev);
384 struct atmarp_entry *entry;
385 struct atm_vcc *vcc;
386 int old;
387 unsigned long flags;
388
389 DPRINTK("clip_start_xmit (skb %p)\n", skb);
390 if (!skb->dst) {
391 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
392 dev_kfree_skb(skb);
393 clip_priv->stats.tx_dropped++;
394 return 0;
395 }
396 if (!skb->dst->neighbour) {
397 #if 0
398 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1);
399 if (!skb->dst->neighbour) {
400 dev_kfree_skb(skb); /* lost that one */
401 clip_priv->stats.tx_dropped++;
402 return 0;
403 }
404 #endif
405 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
406 dev_kfree_skb(skb);
407 clip_priv->stats.tx_dropped++;
408 return 0;
409 }
410 entry = NEIGH2ENTRY(skb->dst->neighbour);
411 if (!entry->vccs) {
412 if (time_after(jiffies, entry->expires)) {
413 /* should be resolved */
414 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
415 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
416 }
417 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
418 skb_queue_tail(&entry->neigh->arp_queue, skb);
419 else {
420 dev_kfree_skb(skb);
421 clip_priv->stats.tx_dropped++;
422 }
423 return 0;
424 }
425 DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs);
426 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
427 DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc);
428 if (entry->vccs->encap) {
429 void *here;
430
431 here = skb_push(skb, RFC1483LLC_LEN);
432 memcpy(here, llc_oui, sizeof(llc_oui));
433 ((u16 *) here)[3] = skb->protocol;
434 }
435 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
436 ATM_SKB(skb)->atm_options = vcc->atm_options;
437 entry->vccs->last_use = jiffies;
438 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
439 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
440 if (old) {
441 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
442 return 0;
443 }
444 clip_priv->stats.tx_packets++;
445 clip_priv->stats.tx_bytes += skb->len;
446 vcc->send(vcc, skb);
447 if (atm_may_send(vcc, 0)) {
448 entry->vccs->xoff = 0;
449 return 0;
450 }
451 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
452 netif_stop_queue(dev); /* XOFF -> throttle immediately */
453 barrier();
454 if (!entry->vccs->xoff)
455 netif_start_queue(dev);
456 /* Oh, we just raced with clip_pop. netif_start_queue should be
457 good enough, because nothing should really be asleep because
458 of the brief netif_stop_queue. If this isn't true or if it
459 changes, use netif_wake_queue instead. */
460 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
461 return 0;
462 }
463
464 static struct net_device_stats *clip_get_stats(struct net_device *dev)
465 {
466 return &PRIV(dev)->stats;
467 }
468
469 static int clip_mkip(struct atm_vcc *vcc, int timeout)
470 {
471 struct clip_vcc *clip_vcc;
472 struct sk_buff_head copy;
473 struct sk_buff *skb;
474
475 if (!vcc->push)
476 return -EBADFD;
477 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
478 if (!clip_vcc)
479 return -ENOMEM;
480 DPRINTK("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc);
481 clip_vcc->vcc = vcc;
482 vcc->user_back = clip_vcc;
483 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
484 clip_vcc->entry = NULL;
485 clip_vcc->xoff = 0;
486 clip_vcc->encap = 1;
487 clip_vcc->last_use = jiffies;
488 clip_vcc->idle_timeout = timeout * HZ;
489 clip_vcc->old_push = vcc->push;
490 clip_vcc->old_pop = vcc->pop;
491 vcc->push = clip_push;
492 vcc->pop = clip_pop;
493 skb_queue_head_init(&copy);
494 skb_migrate(&sk_atm(vcc)->sk_receive_queue, &copy);
495 /* re-process everything received between connection setup and MKIP */
496 while ((skb = skb_dequeue(&copy)) != NULL)
497 if (!clip_devs) {
498 atm_return(vcc, skb->truesize);
499 kfree_skb(skb);
500 } else {
501 unsigned int len = skb->len;
502
503 skb_get(skb);
504 clip_push(vcc, skb);
505 PRIV(skb->dev)->stats.rx_packets--;
506 PRIV(skb->dev)->stats.rx_bytes -= len;
507 kfree_skb(skb);
508 }
509 return 0;
510 }
511
512 static int clip_setentry(struct atm_vcc *vcc, u32 ip)
513 {
514 struct neighbour *neigh;
515 struct atmarp_entry *entry;
516 int error;
517 struct clip_vcc *clip_vcc;
518 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
519 struct rtable *rt;
520
521 if (vcc->push != clip_push) {
522 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
523 return -EBADF;
524 }
525 clip_vcc = CLIP_VCC(vcc);
526 if (!ip) {
527 if (!clip_vcc->entry) {
528 printk(KERN_ERR "hiding hidden ATMARP entry\n");
529 return 0;
530 }
531 DPRINTK("setentry: remove\n");
532 unlink_clip_vcc(clip_vcc);
533 return 0;
534 }
535 error = ip_route_output_key(&rt, &fl);
536 if (error)
537 return error;
538 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
539 ip_rt_put(rt);
540 if (!neigh)
541 return -ENOMEM;
542 entry = NEIGH2ENTRY(neigh);
543 if (entry != clip_vcc->entry) {
544 if (!clip_vcc->entry)
545 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 static void clip_setup(struct net_device *dev)
559 {
560 dev->hard_start_xmit = clip_start_xmit;
561 /* sg_xmit ... */
562 dev->get_stats = clip_get_stats;
563 dev->type = ARPHRD_ATM;
564 dev->hard_header_len = RFC1483LLC_LEN;
565 dev->mtu = RFC1626_MTU;
566 dev->tx_queue_len = 100; /* "normal" queue (packets) */
567 /* When using a "real" qdisc, the qdisc determines the queue */
568 /* length. tx_queue_len is only used for the default case, */
569 /* without any more elaborate queuing. 100 is a reasonable */
570 /* compromise between decent burst-tolerance and protection */
571 /* against memory hogs. */
572 }
573
574 static int clip_create(int number)
575 {
576 struct net_device *dev;
577 struct clip_priv *clip_priv;
578 int error;
579
580 if (number != -1) {
581 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
582 if (PRIV(dev)->number == number)
583 return -EEXIST;
584 } else {
585 number = 0;
586 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
587 if (PRIV(dev)->number >= number)
588 number = PRIV(dev)->number + 1;
589 }
590 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
591 if (!dev)
592 return -ENOMEM;
593 clip_priv = PRIV(dev);
594 sprintf(dev->name, "atm%d", number);
595 spin_lock_init(&clip_priv->xoff_lock);
596 clip_priv->number = number;
597 error = register_netdev(dev);
598 if (error) {
599 free_netdev(dev);
600 return error;
601 }
602 clip_priv->next = clip_devs;
603 clip_devs = dev;
604 DPRINTK("registered (net:%s)\n", dev->name);
605 return number;
606 }
607
608 static int clip_device_event(struct notifier_block *this, unsigned long event,
609 void *arg)
610 {
611 struct net_device *dev = arg;
612
613 if (event == NETDEV_UNREGISTER) {
614 neigh_ifdown(&clip_tbl, dev);
615 return NOTIFY_DONE;
616 }
617
618 /* ignore non-CLIP devices */
619 if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit)
620 return NOTIFY_DONE;
621
622 switch (event) {
623 case NETDEV_UP:
624 DPRINTK("clip_device_event NETDEV_UP\n");
625 to_atmarpd(act_up, PRIV(dev)->number, 0);
626 break;
627 case NETDEV_GOING_DOWN:
628 DPRINTK("clip_device_event NETDEV_DOWN\n");
629 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 to_atmarpd(act_change, PRIV(dev)->number, 0);
635 break;
636 }
637 return NOTIFY_DONE;
638 }
639
640 static int clip_inet_event(struct notifier_block *this, unsigned long event,
641 void *ifa)
642 {
643 struct in_device *in_dev;
644
645 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
646 if (!in_dev || !in_dev->dev) {
647 printk(KERN_WARNING "clip_inet_event: no device\n");
648 return NOTIFY_DONE;
649 }
650 /*
651 * Transitions are of the down-change-up type, so it's sufficient to
652 * handle the change on up.
653 */
654 if (event != NETDEV_UP)
655 return NOTIFY_DONE;
656 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
657 }
658
659
660 static struct notifier_block clip_dev_notifier = {
661 .notifier_call = clip_device_event,
662 };
663
664
665
666 static struct notifier_block clip_inet_notifier = {
667 .notifier_call = clip_inet_event,
668 };
669
670
671
672 static void atmarpd_close(struct atm_vcc *vcc)
673 {
674 DPRINTK("atmarpd_close\n");
675
676 rtnl_lock();
677 atmarpd = NULL;
678 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
679 rtnl_unlock();
680
681 DPRINTK("(done)\n");
682 module_put(THIS_MODULE);
683 }
684
685
686 static struct atmdev_ops atmarpd_dev_ops = {
687 .close = atmarpd_close
688 };
689
690
691 static struct atm_dev atmarpd_dev = {
692 .ops = &atmarpd_dev_ops,
693 .type = "arpd",
694 .number = 999,
695 .lock = SPIN_LOCK_UNLOCKED
696 };
697
698
699 static int atm_init_atmarp(struct atm_vcc *vcc)
700 {
701 rtnl_lock();
702 if (atmarpd) {
703 rtnl_unlock();
704 return -EADDRINUSE;
705 }
706
707 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
708
709 atmarpd = vcc;
710 set_bit(ATM_VF_META,&vcc->flags);
711 set_bit(ATM_VF_READY,&vcc->flags);
712 /* allow replies and avoid getting closed if signaling dies */
713 vcc->dev = &atmarpd_dev;
714 vcc_insert_socket(sk_atm(vcc));
715 vcc->push = NULL;
716 vcc->pop = NULL; /* crash */
717 vcc->push_oam = NULL; /* crash */
718 rtnl_unlock();
719 return 0;
720 }
721
722 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
723 {
724 struct atm_vcc *vcc = ATM_SD(sock);
725 int err = 0;
726
727 switch (cmd) {
728 case SIOCMKCLIP:
729 case ATMARPD_CTRL:
730 case ATMARP_MKIP:
731 case ATMARP_SETENTRY:
732 case ATMARP_ENCAP:
733 if (!capable(CAP_NET_ADMIN))
734 return -EPERM;
735 break;
736 default:
737 return -ENOIOCTLCMD;
738 }
739
740 switch (cmd) {
741 case SIOCMKCLIP:
742 err = clip_create(arg);
743 break;
744 case ATMARPD_CTRL:
745 err = atm_init_atmarp(vcc);
746 if (!err) {
747 sock->state = SS_CONNECTED;
748 __module_get(THIS_MODULE);
749 }
750 break;
751 case ATMARP_MKIP:
752 err = clip_mkip(vcc, arg);
753 break;
754 case ATMARP_SETENTRY:
755 err = clip_setentry(vcc, arg);
756 break;
757 case ATMARP_ENCAP:
758 err = clip_encap(vcc, arg);
759 break;
760 }
761 return err;
762 }
763
764 static struct atm_ioctl clip_ioctl_ops = {
765 .owner = THIS_MODULE,
766 .ioctl = clip_ioctl,
767 };
768
769 #ifdef CONFIG_PROC_FS
770
771 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
772 {
773 static int code[] = { 1, 2, 10, 6, 1, 0 };
774 static int e164[] = { 1, 8, 4, 6, 1, 0 };
775
776 if (*addr->sas_addr.pub) {
777 seq_printf(seq, "%s", addr->sas_addr.pub);
778 if (*addr->sas_addr.prv)
779 seq_putc(seq, '+');
780 } else if (!*addr->sas_addr.prv) {
781 seq_printf(seq, "%s", "(none)");
782 return;
783 }
784 if (*addr->sas_addr.prv) {
785 unsigned char *prv = addr->sas_addr.prv;
786 int *fields;
787 int i, j;
788
789 fields = *prv == ATM_AFI_E164 ? e164 : code;
790 for (i = 0; fields[i]; i++) {
791 for (j = fields[i]; j; j--)
792 seq_printf(seq, "%02X", *prv++);
793 if (fields[i + 1])
794 seq_putc(seq, '.');
795 }
796 }
797 }
798
799 /* This means the neighbour entry has no attached VCC objects. */
800 #define SEQ_NO_VCC_TOKEN ((void *) 2)
801
802 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
803 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
804 {
805 unsigned long exp;
806 char buf[17];
807 int svc, llc, off;
808
809 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
810 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
811
812 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
813
814 if (clip_vcc == SEQ_NO_VCC_TOKEN)
815 exp = entry->neigh->used;
816 else
817 exp = clip_vcc->last_use;
818
819 exp = (jiffies - exp) / HZ;
820
821 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
822 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
823
824 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d",
825 NIPQUAD(entry->ip));
826 while (off < 16)
827 buf[off++] = ' ';
828 buf[off] = '\0';
829 seq_printf(seq, "%s", buf);
830
831 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
832 if (time_before(jiffies, entry->expires))
833 seq_printf(seq, "(resolving)\n");
834 else
835 seq_printf(seq, "(expired, ref %d)\n",
836 atomic_read(&entry->neigh->refcnt));
837 } else if (!svc) {
838 seq_printf(seq, "%d.%d.%d\n",
839 clip_vcc->vcc->dev->number,
840 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
841 } else {
842 svc_addr(seq, &clip_vcc->vcc->remote);
843 seq_putc(seq, '\n');
844 }
845 }
846
847 struct clip_seq_state {
848 /* This member must be first. */
849 struct neigh_seq_state ns;
850
851 /* Local to clip specific iteration. */
852 struct clip_vcc *vcc;
853 };
854
855 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
856 struct clip_vcc *curr)
857 {
858 if (!curr) {
859 curr = e->vccs;
860 if (!curr)
861 return SEQ_NO_VCC_TOKEN;
862 return curr;
863 }
864 if (curr == SEQ_NO_VCC_TOKEN)
865 return NULL;
866
867 curr = curr->next;
868
869 return curr;
870 }
871
872 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
873 struct atmarp_entry *e, loff_t * pos)
874 {
875 struct clip_vcc *vcc = state->vcc;
876
877 vcc = clip_seq_next_vcc(e, vcc);
878 if (vcc && pos != NULL) {
879 while (*pos) {
880 vcc = clip_seq_next_vcc(e, vcc);
881 if (!vcc)
882 break;
883 --(*pos);
884 }
885 }
886 state->vcc = vcc;
887
888 return vcc;
889 }
890
891 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
892 struct neighbour *n, loff_t * pos)
893 {
894 struct clip_seq_state *state = (struct clip_seq_state *)_state;
895
896 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
897 }
898
899 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
900 {
901 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
902 }
903
904 static int clip_seq_show(struct seq_file *seq, void *v)
905 {
906 static char atm_arp_banner[] =
907 "IPitf TypeEncp Idle IP address ATM address\n";
908
909 if (v == SEQ_START_TOKEN) {
910 seq_puts(seq, atm_arp_banner);
911 } else {
912 struct clip_seq_state *state = seq->private;
913 struct neighbour *n = v;
914 struct clip_vcc *vcc = state->vcc;
915
916 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
917 }
918 return 0;
919 }
920
921 static struct seq_operations arp_seq_ops = {
922 .start = clip_seq_start,
923 .next = neigh_seq_next,
924 .stop = neigh_seq_stop,
925 .show = clip_seq_show,
926 };
927
928 static int arp_seq_open(struct inode *inode, struct file *file)
929 {
930 struct clip_seq_state *state;
931 struct seq_file *seq;
932 int rc = -EAGAIN;
933
934 state = kzalloc(sizeof(*state), GFP_KERNEL);
935 if (!state) {
936 rc = -ENOMEM;
937 goto out_kfree;
938 }
939 state->ns.neigh_sub_iter = clip_seq_sub_iter;
940
941 rc = seq_open(file, &arp_seq_ops);
942 if (rc)
943 goto out_kfree;
944
945 seq = file->private_data;
946 seq->private = state;
947 out:
948 return rc;
949
950 out_kfree:
951 kfree(state);
952 goto out;
953 }
954
955 static struct file_operations arp_seq_fops = {
956 .open = arp_seq_open,
957 .read = seq_read,
958 .llseek = seq_lseek,
959 .release = seq_release_private,
960 .owner = THIS_MODULE
961 };
962 #endif
963
964 static int __init atm_clip_init(void)
965 {
966 neigh_table_init_no_netlink(&clip_tbl);
967
968 clip_tbl_hook = &clip_tbl;
969 register_atm_ioctl(&clip_ioctl_ops);
970 register_netdevice_notifier(&clip_dev_notifier);
971 register_inetaddr_notifier(&clip_inet_notifier);
972
973 setup_timer(&idle_timer, idle_timer_check, 0);
974
975 #ifdef CONFIG_PROC_FS
976 {
977 struct proc_dir_entry *p;
978
979 p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
980 if (p)
981 p->proc_fops = &arp_seq_fops;
982 }
983 #endif
984
985 return 0;
986 }
987
988 static void __exit atm_clip_exit(void)
989 {
990 struct net_device *dev, *next;
991
992 remove_proc_entry("arp", atm_proc_root);
993
994 unregister_inetaddr_notifier(&clip_inet_notifier);
995 unregister_netdevice_notifier(&clip_dev_notifier);
996
997 deregister_atm_ioctl(&clip_ioctl_ops);
998
999 /* First, stop the idle timer, so it stops banging
1000 * on the table.
1001 */
1002 del_timer_sync(&idle_timer);
1003
1004 /* Next, purge the table, so that the device
1005 * unregister loop below does not hang due to
1006 * device references remaining in the table.
1007 */
1008 neigh_ifdown(&clip_tbl, NULL);
1009
1010 dev = clip_devs;
1011 while (dev) {
1012 next = PRIV(dev)->next;
1013 unregister_netdev(dev);
1014 free_netdev(dev);
1015 dev = next;
1016 }
1017
1018 /* Now it is safe to fully shutdown whole table. */
1019 neigh_table_clear(&clip_tbl);
1020
1021 clip_tbl_hook = NULL;
1022 }
1023
1024 module_init(atm_clip_init);
1025 module_exit(atm_clip_exit);
1026 MODULE_AUTHOR("Werner Almesberger");
1027 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1028 MODULE_LICENSE("GPL");
WRT350N Kernel Patches