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Linux 2.6.31.6
[linux/fpc-iii.git] / net / atm / clip.c
blobe65a3b1477f8edc79dd8d6ab620fc824c95b10ec
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(skb)) {
373 printk(KERN_ERR "clip_start_xmit: skb_dst(skb) == NULL\n");
374 dev_kfree_skb(skb);
375 dev->stats.tx_dropped++;
376 return 0;
377 }
378 if (!skb_dst(skb)->neighbour) {
379 #if 0
380 skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1);
381 if (!skb_dst(skb)->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(skb)->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(skb)->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 sk_buff_head *rq, queue;
449 struct clip_vcc *clip_vcc;
450 struct sk_buff *skb, *tmp;
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 __skb_queue_head_init(&queue);
473 rq = &sk_atm(vcc)->sk_receive_queue;
474
475 spin_lock_irqsave(&rq->lock, flags);
476 skb_queue_splice_init(rq, &queue);
477 spin_unlock_irqrestore(&rq->lock, flags);
478
479 /* re-process everything received between connection setup and MKIP */
480 skb_queue_walk_safe(&queue, skb, tmp) {
481 if (!clip_devs) {
482 atm_return(vcc, skb->truesize);
483 kfree_skb(skb);
484 } else {
485 struct net_device *dev = skb->dev;
486 unsigned int len = skb->len;
487
488 skb_get(skb);
489 clip_push(vcc, skb);
490 dev->stats.rx_packets--;
491 dev->stats.rx_bytes -= len;
492 kfree_skb(skb);
493 }
494 }
495 return 0;
496 }
497
498 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
499 {
500 struct neighbour *neigh;
501 struct atmarp_entry *entry;
502 int error;
503 struct clip_vcc *clip_vcc;
504 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
505 struct rtable *rt;
506
507 if (vcc->push != clip_push) {
508 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
509 return -EBADF;
510 }
511 clip_vcc = CLIP_VCC(vcc);
512 if (!ip) {
513 if (!clip_vcc->entry) {
514 printk(KERN_ERR "hiding hidden ATMARP entry\n");
515 return 0;
516 }
517 pr_debug("setentry: remove\n");
518 unlink_clip_vcc(clip_vcc);
519 return 0;
520 }
521 error = ip_route_output_key(&init_net, &rt, &fl);
522 if (error)
523 return error;
524 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
525 ip_rt_put(rt);
526 if (!neigh)
527 return -ENOMEM;
528 entry = NEIGH2ENTRY(neigh);
529 if (entry != clip_vcc->entry) {
530 if (!clip_vcc->entry)
531 pr_debug("setentry: add\n");
532 else {
533 pr_debug("setentry: update\n");
534 unlink_clip_vcc(clip_vcc);
535 }
536 link_vcc(clip_vcc, entry);
537 }
538 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
539 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
540 neigh_release(neigh);
541 return error;
542 }
543
544 static const struct net_device_ops clip_netdev_ops = {
545 .ndo_start_xmit = clip_start_xmit,
546 };
547
548 static void clip_setup(struct net_device *dev)
549 {
550 dev->netdev_ops = &clip_netdev_ops;
551 dev->type = ARPHRD_ATM;
552 dev->hard_header_len = RFC1483LLC_LEN;
553 dev->mtu = RFC1626_MTU;
554 dev->tx_queue_len = 100; /* "normal" queue (packets) */
555 /* When using a "real" qdisc, the qdisc determines the queue */
556 /* length. tx_queue_len is only used for the default case, */
557 /* without any more elaborate queuing. 100 is a reasonable */
558 /* compromise between decent burst-tolerance and protection */
559 /* against memory hogs. */
560 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
561 }
562
563 static int clip_create(int number)
564 {
565 struct net_device *dev;
566 struct clip_priv *clip_priv;
567 int error;
568
569 if (number != -1) {
570 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
571 if (PRIV(dev)->number == number)
572 return -EEXIST;
573 } else {
574 number = 0;
575 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
576 if (PRIV(dev)->number >= number)
577 number = PRIV(dev)->number + 1;
578 }
579 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
580 if (!dev)
581 return -ENOMEM;
582 clip_priv = PRIV(dev);
583 sprintf(dev->name, "atm%d", number);
584 spin_lock_init(&clip_priv->xoff_lock);
585 clip_priv->number = number;
586 error = register_netdev(dev);
587 if (error) {
588 free_netdev(dev);
589 return error;
590 }
591 clip_priv->next = clip_devs;
592 clip_devs = dev;
593 pr_debug("registered (net:%s)\n", dev->name);
594 return number;
595 }
596
597 static int clip_device_event(struct notifier_block *this, unsigned long event,
598 void *arg)
599 {
600 struct net_device *dev = arg;
601
602 if (!net_eq(dev_net(dev), &init_net))
603 return NOTIFY_DONE;
604
605 if (event == NETDEV_UNREGISTER) {
606 neigh_ifdown(&clip_tbl, dev);
607 return NOTIFY_DONE;
608 }
609
610 /* ignore non-CLIP devices */
611 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
612 return NOTIFY_DONE;
613
614 switch (event) {
615 case NETDEV_UP:
616 pr_debug("clip_device_event NETDEV_UP\n");
617 to_atmarpd(act_up, PRIV(dev)->number, 0);
618 break;
619 case NETDEV_GOING_DOWN:
620 pr_debug("clip_device_event NETDEV_DOWN\n");
621 to_atmarpd(act_down, PRIV(dev)->number, 0);
622 break;
623 case NETDEV_CHANGE:
624 case NETDEV_CHANGEMTU:
625 pr_debug("clip_device_event NETDEV_CHANGE*\n");
626 to_atmarpd(act_change, PRIV(dev)->number, 0);
627 break;
628 }
629 return NOTIFY_DONE;
630 }
631
632 static int clip_inet_event(struct notifier_block *this, unsigned long event,
633 void *ifa)
634 {
635 struct in_device *in_dev;
636
637 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
638 /*
639 * Transitions are of the down-change-up type, so it's sufficient to
640 * handle the change on up.
641 */
642 if (event != NETDEV_UP)
643 return NOTIFY_DONE;
644 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
645 }
646
647
648 static struct notifier_block clip_dev_notifier = {
649 .notifier_call = clip_device_event,
650 };
651
652
653
654 static struct notifier_block clip_inet_notifier = {
655 .notifier_call = clip_inet_event,
656 };
657
658
659
660 static void atmarpd_close(struct atm_vcc *vcc)
661 {
662 pr_debug("atmarpd_close\n");
663
664 rtnl_lock();
665 atmarpd = NULL;
666 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
667 rtnl_unlock();
668
669 pr_debug("(done)\n");
670 module_put(THIS_MODULE);
671 }
672
673
674 static struct atmdev_ops atmarpd_dev_ops = {
675 .close = atmarpd_close
676 };
677
678
679 static struct atm_dev atmarpd_dev = {
680 .ops = &atmarpd_dev_ops,
681 .type = "arpd",
682 .number = 999,
683 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
684 };
685
686
687 static int atm_init_atmarp(struct atm_vcc *vcc)
688 {
689 rtnl_lock();
690 if (atmarpd) {
691 rtnl_unlock();
692 return -EADDRINUSE;
693 }
694
695 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
696
697 atmarpd = vcc;
698 set_bit(ATM_VF_META,&vcc->flags);
699 set_bit(ATM_VF_READY,&vcc->flags);
700 /* allow replies and avoid getting closed if signaling dies */
701 vcc->dev = &atmarpd_dev;
702 vcc_insert_socket(sk_atm(vcc));
703 vcc->push = NULL;
704 vcc->pop = NULL; /* crash */
705 vcc->push_oam = NULL; /* crash */
706 rtnl_unlock();
707 return 0;
708 }
709
710 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
711 {
712 struct atm_vcc *vcc = ATM_SD(sock);
713 int err = 0;
714
715 switch (cmd) {
716 case SIOCMKCLIP:
717 case ATMARPD_CTRL:
718 case ATMARP_MKIP:
719 case ATMARP_SETENTRY:
720 case ATMARP_ENCAP:
721 if (!capable(CAP_NET_ADMIN))
722 return -EPERM;
723 break;
724 default:
725 return -ENOIOCTLCMD;
726 }
727
728 switch (cmd) {
729 case SIOCMKCLIP:
730 err = clip_create(arg);
731 break;
732 case ATMARPD_CTRL:
733 err = atm_init_atmarp(vcc);
734 if (!err) {
735 sock->state = SS_CONNECTED;
736 __module_get(THIS_MODULE);
737 }
738 break;
739 case ATMARP_MKIP:
740 err = clip_mkip(vcc, arg);
741 break;
742 case ATMARP_SETENTRY:
743 err = clip_setentry(vcc, (__force __be32)arg);
744 break;
745 case ATMARP_ENCAP:
746 err = clip_encap(vcc, arg);
747 break;
748 }
749 return err;
750 }
751
752 static struct atm_ioctl clip_ioctl_ops = {
753 .owner = THIS_MODULE,
754 .ioctl = clip_ioctl,
755 };
756
757 #ifdef CONFIG_PROC_FS
758
759 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
760 {
761 static int code[] = { 1, 2, 10, 6, 1, 0 };
762 static int e164[] = { 1, 8, 4, 6, 1, 0 };
763
764 if (*addr->sas_addr.pub) {
765 seq_printf(seq, "%s", addr->sas_addr.pub);
766 if (*addr->sas_addr.prv)
767 seq_putc(seq, '+');
768 } else if (!*addr->sas_addr.prv) {
769 seq_printf(seq, "%s", "(none)");
770 return;
771 }
772 if (*addr->sas_addr.prv) {
773 unsigned char *prv = addr->sas_addr.prv;
774 int *fields;
775 int i, j;
776
777 fields = *prv == ATM_AFI_E164 ? e164 : code;
778 for (i = 0; fields[i]; i++) {
779 for (j = fields[i]; j; j--)
780 seq_printf(seq, "%02X", *prv++);
781 if (fields[i + 1])
782 seq_putc(seq, '.');
783 }
784 }
785 }
786
787 /* This means the neighbour entry has no attached VCC objects. */
788 #define SEQ_NO_VCC_TOKEN ((void *) 2)
789
790 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
791 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
792 {
793 unsigned long exp;
794 char buf[17];
795 int svc, llc, off;
796
797 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
798 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
799
800 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
801
802 if (clip_vcc == SEQ_NO_VCC_TOKEN)
803 exp = entry->neigh->used;
804 else
805 exp = clip_vcc->last_use;
806
807 exp = (jiffies - exp) / HZ;
808
809 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
810 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
811
812 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
813 &entry->ip);
814 while (off < 16)
815 buf[off++] = ' ';
816 buf[off] = '\0';
817 seq_printf(seq, "%s", buf);
818
819 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
820 if (time_before(jiffies, entry->expires))
821 seq_printf(seq, "(resolving)\n");
822 else
823 seq_printf(seq, "(expired, ref %d)\n",
824 atomic_read(&entry->neigh->refcnt));
825 } else if (!svc) {
826 seq_printf(seq, "%d.%d.%d\n",
827 clip_vcc->vcc->dev->number,
828 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
829 } else {
830 svc_addr(seq, &clip_vcc->vcc->remote);
831 seq_putc(seq, '\n');
832 }
833 }
834
835 struct clip_seq_state {
836 /* This member must be first. */
837 struct neigh_seq_state ns;
838
839 /* Local to clip specific iteration. */
840 struct clip_vcc *vcc;
841 };
842
843 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
844 struct clip_vcc *curr)
845 {
846 if (!curr) {
847 curr = e->vccs;
848 if (!curr)
849 return SEQ_NO_VCC_TOKEN;
850 return curr;
851 }
852 if (curr == SEQ_NO_VCC_TOKEN)
853 return NULL;
854
855 curr = curr->next;
856
857 return curr;
858 }
859
860 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
861 struct atmarp_entry *e, loff_t * pos)
862 {
863 struct clip_vcc *vcc = state->vcc;
864
865 vcc = clip_seq_next_vcc(e, vcc);
866 if (vcc && pos != NULL) {
867 while (*pos) {
868 vcc = clip_seq_next_vcc(e, vcc);
869 if (!vcc)
870 break;
871 --(*pos);
872 }
873 }
874 state->vcc = vcc;
875
876 return vcc;
877 }
878
879 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
880 struct neighbour *n, loff_t * pos)
881 {
882 struct clip_seq_state *state = (struct clip_seq_state *)_state;
883
884 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
885 }
886
887 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
888 {
889 struct clip_seq_state *state = seq->private;
890 state->ns.neigh_sub_iter = clip_seq_sub_iter;
891 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
892 }
893
894 static int clip_seq_show(struct seq_file *seq, void *v)
895 {
896 static char atm_arp_banner[] =
897 "IPitf TypeEncp Idle IP address ATM address\n";
898
899 if (v == SEQ_START_TOKEN) {
900 seq_puts(seq, atm_arp_banner);
901 } else {
902 struct clip_seq_state *state = seq->private;
903 struct neighbour *n = v;
904 struct clip_vcc *vcc = state->vcc;
905
906 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
907 }
908 return 0;
909 }
910
911 static const struct seq_operations arp_seq_ops = {
912 .start = clip_seq_start,
913 .next = neigh_seq_next,
914 .stop = neigh_seq_stop,
915 .show = clip_seq_show,
916 };
917
918 static int arp_seq_open(struct inode *inode, struct file *file)
919 {
920 return seq_open_net(inode, file, &arp_seq_ops,
921 sizeof(struct clip_seq_state));
922 }
923
924 static const struct file_operations arp_seq_fops = {
925 .open = arp_seq_open,
926 .read = seq_read,
927 .llseek = seq_lseek,
928 .release = seq_release_net,
929 .owner = THIS_MODULE
930 };
931 #endif
932
933 static void atm_clip_exit_noproc(void);
934
935 static int __init atm_clip_init(void)
936 {
937 neigh_table_init_no_netlink(&clip_tbl);
938
939 clip_tbl_hook = &clip_tbl;
940 register_atm_ioctl(&clip_ioctl_ops);
941 register_netdevice_notifier(&clip_dev_notifier);
942 register_inetaddr_notifier(&clip_inet_notifier);
943
944 setup_timer(&idle_timer, idle_timer_check, 0);
945
946 #ifdef CONFIG_PROC_FS
947 {
948 struct proc_dir_entry *p;
949
950 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
951 if (!p) {
952 printk(KERN_ERR "Unable to initialize "
953 "/proc/net/atm/arp\n");
954 atm_clip_exit_noproc();
955 return -ENOMEM;
956 }
957 }
958 #endif
959
960 return 0;
961 }
962
963 static void atm_clip_exit_noproc(void)
964 {
965 struct net_device *dev, *next;
966
967 unregister_inetaddr_notifier(&clip_inet_notifier);
968 unregister_netdevice_notifier(&clip_dev_notifier);
969
970 deregister_atm_ioctl(&clip_ioctl_ops);
971
972 /* First, stop the idle timer, so it stops banging
973 * on the table.
974 */
975 del_timer_sync(&idle_timer);
976
977 /* Next, purge the table, so that the device
978 * unregister loop below does not hang due to
979 * device references remaining in the table.
980 */
981 neigh_ifdown(&clip_tbl, NULL);
982
983 dev = clip_devs;
984 while (dev) {
985 next = PRIV(dev)->next;
986 unregister_netdev(dev);
987 free_netdev(dev);
988 dev = next;
989 }
990
991 /* Now it is safe to fully shutdown whole table. */
992 neigh_table_clear(&clip_tbl);
993
994 clip_tbl_hook = NULL;
995 }
996
997 static void __exit atm_clip_exit(void)
998 {
999 remove_proc_entry("arp", atm_proc_root);
1000
1001 atm_clip_exit_noproc();
1002 }
1003
1004 module_init(atm_clip_init);
1005 module_exit(atm_clip_exit);
1006 MODULE_AUTHOR("Werner Almesberger");
1007 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1008 MODULE_LICENSE("GPL");
Linux with added FPC-III support