?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ARM: OMAP4: SMP: Update defconfig for OMAP4430
[linux-ginger.git] / net / atm / clip.c
blob3dc0a3a42a574c43ba71aaed05f29e6246445b24
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 <net/atmclip.h>
42
43 static struct net_device *clip_devs;
44 static struct atm_vcc *atmarpd;
45 static struct neigh_table clip_tbl;
46 static struct timer_list idle_timer;
47
48 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
49 {
50 struct sock *sk;
51 struct atmarp_ctrl *ctrl;
52 struct sk_buff *skb;
53
54 pr_debug("to_atmarpd(%d)\n", type);
55 if (!atmarpd)
56 return -EUNATCH;
57 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
58 if (!skb)
59 return -ENOMEM;
60 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
61 ctrl->type = type;
62 ctrl->itf_num = itf;
63 ctrl->ip = ip;
64 atm_force_charge(atmarpd, skb->truesize);
65
66 sk = sk_atm(atmarpd);
67 skb_queue_tail(&sk->sk_receive_queue, skb);
68 sk->sk_data_ready(sk, skb->len);
69 return 0;
70 }
71
72 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
73 {
74 pr_debug("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry,
75 entry->neigh);
76 clip_vcc->entry = entry;
77 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
78 clip_vcc->next = entry->vccs;
79 entry->vccs = clip_vcc;
80 entry->neigh->used = jiffies;
81 }
82
83 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
84 {
85 struct atmarp_entry *entry = clip_vcc->entry;
86 struct clip_vcc **walk;
87
88 if (!entry) {
89 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
90 return;
91 }
92 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
93 entry->neigh->used = jiffies;
94 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
95 if (*walk == clip_vcc) {
96 int error;
97
98 *walk = clip_vcc->next; /* atomic */
99 clip_vcc->entry = NULL;
100 if (clip_vcc->xoff)
101 netif_wake_queue(entry->neigh->dev);
102 if (entry->vccs)
103 goto out;
104 entry->expires = jiffies - 1;
105 /* force resolution or expiration */
106 error = neigh_update(entry->neigh, NULL, NUD_NONE,
107 NEIGH_UPDATE_F_ADMIN);
108 if (error)
109 printk(KERN_CRIT "unlink_clip_vcc: "
110 "neigh_update failed with %d\n", error);
111 goto out;
112 }
113 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
114 "0x%p)\n", entry, clip_vcc);
115 out:
116 netif_tx_unlock_bh(entry->neigh->dev);
117 }
118
119 /* The neighbour entry n->lock is held. */
120 static int neigh_check_cb(struct neighbour *n)
121 {
122 struct atmarp_entry *entry = NEIGH2ENTRY(n);
123 struct clip_vcc *cv;
124
125 for (cv = entry->vccs; cv; cv = cv->next) {
126 unsigned long exp = cv->last_use + cv->idle_timeout;
127
128 if (cv->idle_timeout && time_after(jiffies, exp)) {
129 pr_debug("releasing vcc %p->%p of entry %p\n",
130 cv, cv->vcc, entry);
131 vcc_release_async(cv->vcc, -ETIMEDOUT);
132 }
133 }
134
135 if (entry->vccs || time_before(jiffies, entry->expires))
136 return 0;
137
138 if (atomic_read(&n->refcnt) > 1) {
139 struct sk_buff *skb;
140
141 pr_debug("destruction postponed with ref %d\n",
142 atomic_read(&n->refcnt));
143
144 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
145 dev_kfree_skb(skb);
146
147 return 0;
148 }
149
150 pr_debug("expired neigh %p\n", n);
151 return 1;
152 }
153
154 static void idle_timer_check(unsigned long dummy)
155 {
156 write_lock(&clip_tbl.lock);
157 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
158 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
159 write_unlock(&clip_tbl.lock);
160 }
161
162 static int clip_arp_rcv(struct sk_buff *skb)
163 {
164 struct atm_vcc *vcc;
165
166 pr_debug("clip_arp_rcv\n");
167 vcc = ATM_SKB(skb)->vcc;
168 if (!vcc || !atm_charge(vcc, skb->truesize)) {
169 dev_kfree_skb_any(skb);
170 return 0;
171 }
172 pr_debug("pushing to %p\n", vcc);
173 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
174 CLIP_VCC(vcc)->old_push(vcc, skb);
175 return 0;
176 }
177
178 static const unsigned char llc_oui[] = {
179 0xaa, /* DSAP: non-ISO */
180 0xaa, /* SSAP: non-ISO */
181 0x03, /* Ctrl: Unnumbered Information Command PDU */
182 0x00, /* OUI: EtherType */
183 0x00,
184 0x00
185 };
186
187 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
188 {
189 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
190
191 pr_debug("clip push\n");
192 if (!skb) {
193 pr_debug("removing VCC %p\n", clip_vcc);
194 if (clip_vcc->entry)
195 unlink_clip_vcc(clip_vcc);
196 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
197 kfree(clip_vcc);
198 return;
199 }
200 atm_return(vcc, skb->truesize);
201 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
202 /* clip_vcc->entry == NULL if we don't have an IP address yet */
203 if (!skb->dev) {
204 dev_kfree_skb_any(skb);
205 return;
206 }
207 ATM_SKB(skb)->vcc = vcc;
208 skb_reset_mac_header(skb);
209 if (!clip_vcc->encap
210 || skb->len < RFC1483LLC_LEN
211 || memcmp(skb->data, llc_oui, sizeof (llc_oui)))
212 skb->protocol = htons(ETH_P_IP);
213 else {
214 skb->protocol = ((__be16 *) skb->data)[3];
215 skb_pull(skb, RFC1483LLC_LEN);
216 if (skb->protocol == htons(ETH_P_ARP)) {
217 skb->dev->stats.rx_packets++;
218 skb->dev->stats.rx_bytes += skb->len;
219 clip_arp_rcv(skb);
220 return;
221 }
222 }
223 clip_vcc->last_use = jiffies;
224 skb->dev->stats.rx_packets++;
225 skb->dev->stats.rx_bytes += skb->len;
226 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
227 netif_rx(skb);
228 }
229
230 /*
231 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
232 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
233 */
234
235 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
236 {
237 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
238 struct net_device *dev = skb->dev;
239 int old;
240 unsigned long flags;
241
242 pr_debug("clip_pop(vcc %p)\n", vcc);
243 clip_vcc->old_pop(vcc, skb);
244 /* skb->dev == NULL in outbound ARP packets */
245 if (!dev)
246 return;
247 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
248 if (atm_may_send(vcc, 0)) {
249 old = xchg(&clip_vcc->xoff, 0);
250 if (old)
251 netif_wake_queue(dev);
252 }
253 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
254 }
255
256 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
257 {
258 pr_debug("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb);
259 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
260 }
261
262 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
263 {
264 #ifndef CONFIG_ATM_CLIP_NO_ICMP
265 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
266 #endif
267 kfree_skb(skb);
268 }
269
270 static struct neigh_ops clip_neigh_ops = {
271 .family = AF_INET,
272 .solicit = clip_neigh_solicit,
273 .error_report = clip_neigh_error,
274 .output = dev_queue_xmit,
275 .connected_output = dev_queue_xmit,
276 .hh_output = dev_queue_xmit,
277 .queue_xmit = dev_queue_xmit,
278 };
279
280 static int clip_constructor(struct neighbour *neigh)
281 {
282 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
283 struct net_device *dev = neigh->dev;
284 struct in_device *in_dev;
285 struct neigh_parms *parms;
286
287 pr_debug("clip_constructor (neigh %p, entry %p)\n", neigh, entry);
288 neigh->type = inet_addr_type(&init_net, entry->ip);
289 if (neigh->type != RTN_UNICAST)
290 return -EINVAL;
291
292 rcu_read_lock();
293 in_dev = __in_dev_get_rcu(dev);
294 if (!in_dev) {
295 rcu_read_unlock();
296 return -EINVAL;
297 }
298
299 parms = in_dev->arp_parms;
300 __neigh_parms_put(neigh->parms);
301 neigh->parms = neigh_parms_clone(parms);
302 rcu_read_unlock();
303
304 neigh->ops = &clip_neigh_ops;
305 neigh->output = neigh->nud_state & NUD_VALID ?
306 neigh->ops->connected_output : neigh->ops->output;
307 entry->neigh = neigh;
308 entry->vccs = NULL;
309 entry->expires = jiffies - 1;
310 return 0;
311 }
312
313 static u32 clip_hash(const void *pkey, const struct net_device *dev)
314 {
315 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
316 }
317
318 static struct neigh_table clip_tbl = {
319 .family = AF_INET,
320 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
321 .key_len = 4,
322 .hash = clip_hash,
323 .constructor = clip_constructor,
324 .id = "clip_arp_cache",
325
326 /* parameters are copied from ARP ... */
327 .parms = {
328 .tbl = &clip_tbl,
329 .base_reachable_time = 30 * HZ,
330 .retrans_time = 1 * HZ,
331 .gc_staletime = 60 * HZ,
332 .reachable_time = 30 * HZ,
333 .delay_probe_time = 5 * HZ,
334 .queue_len = 3,
335 .ucast_probes = 3,
336 .mcast_probes = 3,
337 .anycast_delay = 1 * HZ,
338 .proxy_delay = (8 * HZ) / 10,
339 .proxy_qlen = 64,
340 .locktime = 1 * HZ,
341 },
342 .gc_interval = 30 * HZ,
343 .gc_thresh1 = 128,
344 .gc_thresh2 = 512,
345 .gc_thresh3 = 1024,
346 };
347
348 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
349
350 /*
351 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
352 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
353 * don't increment the usage count. This is used to create entries in
354 * clip_setentry.
355 */
356
357 static int clip_encap(struct atm_vcc *vcc, int mode)
358 {
359 CLIP_VCC(vcc)->encap = mode;
360 return 0;
361 }
362
363 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev)
364 {
365 struct clip_priv *clip_priv = PRIV(dev);
366 struct atmarp_entry *entry;
367 struct atm_vcc *vcc;
368 int old;
369 unsigned long flags;
370
371 pr_debug("clip_start_xmit (skb %p)\n", skb);
372 if (!skb->dst) {
373 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
374 dev_kfree_skb(skb);
375 dev->stats.tx_dropped++;
376 return 0;
377 }
378 if (!skb->dst->neighbour) {
379 #if 0
380 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1);
381 if (!skb->dst->neighbour) {
382 dev_kfree_skb(skb); /* lost that one */
383 dev->stats.tx_dropped++;
384 return 0;
385 }
386 #endif
387 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
388 dev_kfree_skb(skb);
389 dev->stats.tx_dropped++;
390 return 0;
391 }
392 entry = NEIGH2ENTRY(skb->dst->neighbour);
393 if (!entry->vccs) {
394 if (time_after(jiffies, entry->expires)) {
395 /* should be resolved */
396 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
397 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
398 }
399 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
400 skb_queue_tail(&entry->neigh->arp_queue, skb);
401 else {
402 dev_kfree_skb(skb);
403 dev->stats.tx_dropped++;
404 }
405 return 0;
406 }
407 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
408 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
409 pr_debug("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc);
410 if (entry->vccs->encap) {
411 void *here;
412
413 here = skb_push(skb, RFC1483LLC_LEN);
414 memcpy(here, llc_oui, sizeof(llc_oui));
415 ((__be16 *) here)[3] = skb->protocol;
416 }
417 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
418 ATM_SKB(skb)->atm_options = vcc->atm_options;
419 entry->vccs->last_use = jiffies;
420 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
421 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
422 if (old) {
423 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
424 return 0;
425 }
426 dev->stats.tx_packets++;
427 dev->stats.tx_bytes += skb->len;
428 vcc->send(vcc, skb);
429 if (atm_may_send(vcc, 0)) {
430 entry->vccs->xoff = 0;
431 return 0;
432 }
433 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
434 netif_stop_queue(dev); /* XOFF -> throttle immediately */
435 barrier();
436 if (!entry->vccs->xoff)
437 netif_start_queue(dev);
438 /* Oh, we just raced with clip_pop. netif_start_queue should be
439 good enough, because nothing should really be asleep because
440 of the brief netif_stop_queue. If this isn't true or if it
441 changes, use netif_wake_queue instead. */
442 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
443 return 0;
444 }
445
446 static int clip_mkip(struct atm_vcc *vcc, int timeout)
447 {
448 struct clip_vcc *clip_vcc;
449 struct sk_buff *skb;
450 struct sk_buff_head *rq;
451 unsigned long flags;
452
453 if (!vcc->push)
454 return -EBADFD;
455 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
456 if (!clip_vcc)
457 return -ENOMEM;
458 pr_debug("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc);
459 clip_vcc->vcc = vcc;
460 vcc->user_back = clip_vcc;
461 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
462 clip_vcc->entry = NULL;
463 clip_vcc->xoff = 0;
464 clip_vcc->encap = 1;
465 clip_vcc->last_use = jiffies;
466 clip_vcc->idle_timeout = timeout * HZ;
467 clip_vcc->old_push = vcc->push;
468 clip_vcc->old_pop = vcc->pop;
469 vcc->push = clip_push;
470 vcc->pop = clip_pop;
471
472 rq = &sk_atm(vcc)->sk_receive_queue;
473
474 spin_lock_irqsave(&rq->lock, flags);
475 if (skb_queue_empty(rq)) {
476 skb = NULL;
477 } else {
478 /* NULL terminate the list. */
479 rq->prev->next = NULL;
480 skb = rq->next;
481 }
482 rq->prev = rq->next = (struct sk_buff *)rq;
483 rq->qlen = 0;
484 spin_unlock_irqrestore(&rq->lock, flags);
485
486 /* re-process everything received between connection setup and MKIP */
487 while (skb) {
488 struct sk_buff *next = skb->next;
489
490 skb->next = skb->prev = NULL;
491 if (!clip_devs) {
492 atm_return(vcc, skb->truesize);
493 kfree_skb(skb);
494 } else {
495 unsigned int len = skb->len;
496
497 skb_get(skb);
498 clip_push(vcc, skb);
499 skb->dev->stats.rx_packets--;
500 skb->dev->stats.rx_bytes -= len;
501 kfree_skb(skb);
502 }
503
504 skb = next;
505 }
506 return 0;
507 }
508
509 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
510 {
511 struct neighbour *neigh;
512 struct atmarp_entry *entry;
513 int error;
514 struct clip_vcc *clip_vcc;
515 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
516 struct rtable *rt;
517
518 if (vcc->push != clip_push) {
519 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
520 return -EBADF;
521 }
522 clip_vcc = CLIP_VCC(vcc);
523 if (!ip) {
524 if (!clip_vcc->entry) {
525 printk(KERN_ERR "hiding hidden ATMARP entry\n");
526 return 0;
527 }
528 pr_debug("setentry: remove\n");
529 unlink_clip_vcc(clip_vcc);
530 return 0;
531 }
532 error = ip_route_output_key(&init_net, &rt, &fl);
533 if (error)
534 return error;
535 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
536 ip_rt_put(rt);
537 if (!neigh)
538 return -ENOMEM;
539 entry = NEIGH2ENTRY(neigh);
540 if (entry != clip_vcc->entry) {
541 if (!clip_vcc->entry)
542 pr_debug("setentry: add\n");
543 else {
544 pr_debug("setentry: update\n");
545 unlink_clip_vcc(clip_vcc);
546 }
547 link_vcc(clip_vcc, entry);
548 }
549 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
550 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
551 neigh_release(neigh);
552 return error;
553 }
554
555 static const struct net_device_ops clip_netdev_ops = {
556 .ndo_start_xmit = clip_start_xmit,
557 };
558
559 static void clip_setup(struct net_device *dev)
560 {
561 dev->netdev_ops = &clip_netdev_ops;
562 dev->type = ARPHRD_ATM;
563 dev->hard_header_len = RFC1483LLC_LEN;
564 dev->mtu = RFC1626_MTU;
565 dev->tx_queue_len = 100; /* "normal" queue (packets) */
566 /* When using a "real" qdisc, the qdisc determines the queue */
567 /* length. tx_queue_len is only used for the default case, */
568 /* without any more elaborate queuing. 100 is a reasonable */
569 /* compromise between decent burst-tolerance and protection */
570 /* against memory hogs. */
571 }
572
573 static int clip_create(int number)
574 {
575 struct net_device *dev;
576 struct clip_priv *clip_priv;
577 int error;
578
579 if (number != -1) {
580 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
581 if (PRIV(dev)->number == number)
582 return -EEXIST;
583 } else {
584 number = 0;
585 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
586 if (PRIV(dev)->number >= number)
587 number = PRIV(dev)->number + 1;
588 }
589 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
590 if (!dev)
591 return -ENOMEM;
592 clip_priv = PRIV(dev);
593 sprintf(dev->name, "atm%d", number);
594 spin_lock_init(&clip_priv->xoff_lock);
595 clip_priv->number = number;
596 error = register_netdev(dev);
597 if (error) {
598 free_netdev(dev);
599 return error;
600 }
601 clip_priv->next = clip_devs;
602 clip_devs = dev;
603 pr_debug("registered (net:%s)\n", dev->name);
604 return number;
605 }
606
607 static int clip_device_event(struct notifier_block *this, unsigned long event,
608 void *arg)
609 {
610 struct net_device *dev = arg;
611
612 if (!net_eq(dev_net(dev), &init_net))
613 return NOTIFY_DONE;
614
615 if (event == NETDEV_UNREGISTER) {
616 neigh_ifdown(&clip_tbl, dev);
617 return NOTIFY_DONE;
618 }
619
620 /* ignore non-CLIP devices */
621 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
622 return NOTIFY_DONE;
623
624 switch (event) {
625 case NETDEV_UP:
626 pr_debug("clip_device_event NETDEV_UP\n");
627 to_atmarpd(act_up, PRIV(dev)->number, 0);
628 break;
629 case NETDEV_GOING_DOWN:
630 pr_debug("clip_device_event NETDEV_DOWN\n");
631 to_atmarpd(act_down, PRIV(dev)->number, 0);
632 break;
633 case NETDEV_CHANGE:
634 case NETDEV_CHANGEMTU:
635 pr_debug("clip_device_event NETDEV_CHANGE*\n");
636 to_atmarpd(act_change, PRIV(dev)->number, 0);
637 break;
638 }
639 return NOTIFY_DONE;
640 }
641
642 static int clip_inet_event(struct notifier_block *this, unsigned long event,
643 void *ifa)
644 {
645 struct in_device *in_dev;
646
647 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
648 /*
649 * Transitions are of the down-change-up type, so it's sufficient to
650 * handle the change on up.
651 */
652 if (event != NETDEV_UP)
653 return NOTIFY_DONE;
654 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
655 }
656
657
658 static struct notifier_block clip_dev_notifier = {
659 .notifier_call = clip_device_event,
660 };
661
662
663
664 static struct notifier_block clip_inet_notifier = {
665 .notifier_call = clip_inet_event,
666 };
667
668
669
670 static void atmarpd_close(struct atm_vcc *vcc)
671 {
672 pr_debug("atmarpd_close\n");
673
674 rtnl_lock();
675 atmarpd = NULL;
676 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
677 rtnl_unlock();
678
679 pr_debug("(done)\n");
680 module_put(THIS_MODULE);
681 }
682
683
684 static struct atmdev_ops atmarpd_dev_ops = {
685 .close = atmarpd_close
686 };
687
688
689 static struct atm_dev atmarpd_dev = {
690 .ops = &atmarpd_dev_ops,
691 .type = "arpd",
692 .number = 999,
693 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
694 };
695
696
697 static int atm_init_atmarp(struct atm_vcc *vcc)
698 {
699 rtnl_lock();
700 if (atmarpd) {
701 rtnl_unlock();
702 return -EADDRINUSE;
703 }
704
705 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
706
707 atmarpd = vcc;
708 set_bit(ATM_VF_META,&vcc->flags);
709 set_bit(ATM_VF_READY,&vcc->flags);
710 /* allow replies and avoid getting closed if signaling dies */
711 vcc->dev = &atmarpd_dev;
712 vcc_insert_socket(sk_atm(vcc));
713 vcc->push = NULL;
714 vcc->pop = NULL; /* crash */
715 vcc->push_oam = NULL; /* crash */
716 rtnl_unlock();
717 return 0;
718 }
719
720 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
721 {
722 struct atm_vcc *vcc = ATM_SD(sock);
723 int err = 0;
724
725 switch (cmd) {
726 case SIOCMKCLIP:
727 case ATMARPD_CTRL:
728 case ATMARP_MKIP:
729 case ATMARP_SETENTRY:
730 case ATMARP_ENCAP:
731 if (!capable(CAP_NET_ADMIN))
732 return -EPERM;
733 break;
734 default:
735 return -ENOIOCTLCMD;
736 }
737
738 switch (cmd) {
739 case SIOCMKCLIP:
740 err = clip_create(arg);
741 break;
742 case ATMARPD_CTRL:
743 err = atm_init_atmarp(vcc);
744 if (!err) {
745 sock->state = SS_CONNECTED;
746 __module_get(THIS_MODULE);
747 }
748 break;
749 case ATMARP_MKIP:
750 err = clip_mkip(vcc, arg);
751 break;
752 case ATMARP_SETENTRY:
753 err = clip_setentry(vcc, (__force __be32)arg);
754 break;
755 case ATMARP_ENCAP:
756 err = clip_encap(vcc, arg);
757 break;
758 }
759 return err;
760 }
761
762 static struct atm_ioctl clip_ioctl_ops = {
763 .owner = THIS_MODULE,
764 .ioctl = clip_ioctl,
765 };
766
767 #ifdef CONFIG_PROC_FS
768
769 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
770 {
771 static int code[] = { 1, 2, 10, 6, 1, 0 };
772 static int e164[] = { 1, 8, 4, 6, 1, 0 };
773
774 if (*addr->sas_addr.pub) {
775 seq_printf(seq, "%s", addr->sas_addr.pub);
776 if (*addr->sas_addr.prv)
777 seq_putc(seq, '+');
778 } else if (!*addr->sas_addr.prv) {
779 seq_printf(seq, "%s", "(none)");
780 return;
781 }
782 if (*addr->sas_addr.prv) {
783 unsigned char *prv = addr->sas_addr.prv;
784 int *fields;
785 int i, j;
786
787 fields = *prv == ATM_AFI_E164 ? e164 : code;
788 for (i = 0; fields[i]; i++) {
789 for (j = fields[i]; j; j--)
790 seq_printf(seq, "%02X", *prv++);
791 if (fields[i + 1])
792 seq_putc(seq, '.');
793 }
794 }
795 }
796
797 /* This means the neighbour entry has no attached VCC objects. */
798 #define SEQ_NO_VCC_TOKEN ((void *) 2)
799
800 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
801 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
802 {
803 unsigned long exp;
804 char buf[17];
805 int svc, llc, off;
806
807 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
808 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
809
810 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
811
812 if (clip_vcc == SEQ_NO_VCC_TOKEN)
813 exp = entry->neigh->used;
814 else
815 exp = clip_vcc->last_use;
816
817 exp = (jiffies - exp) / HZ;
818
819 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
820 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
821
822 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
823 &entry->ip);
824 while (off < 16)
825 buf[off++] = ' ';
826 buf[off] = '\0';
827 seq_printf(seq, "%s", buf);
828
829 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
830 if (time_before(jiffies, entry->expires))
831 seq_printf(seq, "(resolving)\n");
832 else
833 seq_printf(seq, "(expired, ref %d)\n",
834 atomic_read(&entry->neigh->refcnt));
835 } else if (!svc) {
836 seq_printf(seq, "%d.%d.%d\n",
837 clip_vcc->vcc->dev->number,
838 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
839 } else {
840 svc_addr(seq, &clip_vcc->vcc->remote);
841 seq_putc(seq, '\n');
842 }
843 }
844
845 struct clip_seq_state {
846 /* This member must be first. */
847 struct neigh_seq_state ns;
848
849 /* Local to clip specific iteration. */
850 struct clip_vcc *vcc;
851 };
852
853 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
854 struct clip_vcc *curr)
855 {
856 if (!curr) {
857 curr = e->vccs;
858 if (!curr)
859 return SEQ_NO_VCC_TOKEN;
860 return curr;
861 }
862 if (curr == SEQ_NO_VCC_TOKEN)
863 return NULL;
864
865 curr = curr->next;
866
867 return curr;
868 }
869
870 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
871 struct atmarp_entry *e, loff_t * pos)
872 {
873 struct clip_vcc *vcc = state->vcc;
874
875 vcc = clip_seq_next_vcc(e, vcc);
876 if (vcc && pos != NULL) {
877 while (*pos) {
878 vcc = clip_seq_next_vcc(e, vcc);
879 if (!vcc)
880 break;
881 --(*pos);
882 }
883 }
884 state->vcc = vcc;
885
886 return vcc;
887 }
888
889 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
890 struct neighbour *n, loff_t * pos)
891 {
892 struct clip_seq_state *state = (struct clip_seq_state *)_state;
893
894 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
895 }
896
897 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
898 {
899 struct clip_seq_state *state = seq->private;
900 state->ns.neigh_sub_iter = clip_seq_sub_iter;
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 const 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 return seq_open_net(inode, file, &arp_seq_ops,
931 sizeof(struct clip_seq_state));
932 }
933
934 static const struct file_operations arp_seq_fops = {
935 .open = arp_seq_open,
936 .read = seq_read,
937 .llseek = seq_lseek,
938 .release = seq_release_net,
939 .owner = THIS_MODULE
940 };
941 #endif
942
943 static void atm_clip_exit_noproc(void);
944
945 static int __init atm_clip_init(void)
946 {
947 neigh_table_init_no_netlink(&clip_tbl);
948
949 clip_tbl_hook = &clip_tbl;
950 register_atm_ioctl(&clip_ioctl_ops);
951 register_netdevice_notifier(&clip_dev_notifier);
952 register_inetaddr_notifier(&clip_inet_notifier);
953
954 setup_timer(&idle_timer, idle_timer_check, 0);
955
956 #ifdef CONFIG_PROC_FS
957 {
958 struct proc_dir_entry *p;
959
960 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
961 if (!p) {
962 printk(KERN_ERR "Unable to initialize "
963 "/proc/net/atm/arp\n");
964 atm_clip_exit_noproc();
965 return -ENOMEM;
966 }
967 }
968 #endif
969
970 return 0;
971 }
972
973 static void atm_clip_exit_noproc(void)
974 {
975 struct net_device *dev, *next;
976
977 unregister_inetaddr_notifier(&clip_inet_notifier);
978 unregister_netdevice_notifier(&clip_dev_notifier);
979
980 deregister_atm_ioctl(&clip_ioctl_ops);
981
982 /* First, stop the idle timer, so it stops banging
983 * on the table.
984 */
985 del_timer_sync(&idle_timer);
986
987 /* Next, purge the table, so that the device
988 * unregister loop below does not hang due to
989 * device references remaining in the table.
990 */
991 neigh_ifdown(&clip_tbl, NULL);
992
993 dev = clip_devs;
994 while (dev) {
995 next = PRIV(dev)->next;
996 unregister_netdev(dev);
997 free_netdev(dev);
998 dev = next;
999 }
1000
1001 /* Now it is safe to fully shutdown whole table. */
1002 neigh_table_clear(&clip_tbl);
1003
1004 clip_tbl_hook = NULL;
1005 }
1006
1007 static void __exit atm_clip_exit(void)
1008 {
1009 remove_proc_entry("arp", atm_proc_root);
1010
1011 atm_clip_exit_noproc();
1012 }
1013
1014 module_init(atm_clip_init);
1015 module_exit(atm_clip_exit);
1016 MODULE_AUTHOR("Werner Almesberger");
1017 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1018 MODULE_LICENSE("GPL");
Linux for Ginger Game Console