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USB: cp210x: call generic open last in open
[zen-stable.git] / net / atm / clip.c
blobc12c2582457cf80cb2844563196a3473a9d17e00
1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */
2
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
6
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/capability.h>
23 #include <linux/ip.h> /* for net/route.h */
24 #include <linux/in.h> /* for struct sockaddr_in */
25 #include <linux/if.h> /* for IFF_UP */
26 #include <linux/inetdevice.h>
27 #include <linux/bitops.h>
28 #include <linux/poison.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/rcupdate.h>
32 #include <linux/jhash.h>
33 #include <linux/slab.h>
34 #include <net/route.h> /* for struct rtable and routing */
35 #include <net/icmp.h> /* icmp_send */
36 #include <net/arp.h>
37 #include <linux/param.h> /* for HZ */
38 #include <linux/uaccess.h>
39 #include <asm/byteorder.h> /* for htons etc. */
40 #include <asm/system.h> /* save/restore_flags */
41 #include <linux/atomic.h>
42
43 #include "common.h"
44 #include "resources.h"
45 #include <net/atmclip.h>
46
47 static struct net_device *clip_devs;
48 static struct atm_vcc *atmarpd;
49 static struct neigh_table clip_tbl;
50 static struct timer_list idle_timer;
51
52 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
53 {
54 struct sock *sk;
55 struct atmarp_ctrl *ctrl;
56 struct sk_buff *skb;
57
58 pr_debug("(%d)\n", type);
59 if (!atmarpd)
60 return -EUNATCH;
61 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
62 if (!skb)
63 return -ENOMEM;
64 ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl));
65 ctrl->type = type;
66 ctrl->itf_num = itf;
67 ctrl->ip = ip;
68 atm_force_charge(atmarpd, skb->truesize);
69
70 sk = sk_atm(atmarpd);
71 skb_queue_tail(&sk->sk_receive_queue, skb);
72 sk->sk_data_ready(sk, skb->len);
73 return 0;
74 }
75
76 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
77 {
78 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
79 clip_vcc->entry = entry;
80 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
81 clip_vcc->next = entry->vccs;
82 entry->vccs = clip_vcc;
83 entry->neigh->used = jiffies;
84 }
85
86 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
87 {
88 struct atmarp_entry *entry = clip_vcc->entry;
89 struct clip_vcc **walk;
90
91 if (!entry) {
92 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
93 return;
94 }
95 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
96 entry->neigh->used = jiffies;
97 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
98 if (*walk == clip_vcc) {
99 int error;
100
101 *walk = clip_vcc->next; /* atomic */
102 clip_vcc->entry = NULL;
103 if (clip_vcc->xoff)
104 netif_wake_queue(entry->neigh->dev);
105 if (entry->vccs)
106 goto out;
107 entry->expires = jiffies - 1;
108 /* force resolution or expiration */
109 error = neigh_update(entry->neigh, NULL, NUD_NONE,
110 NEIGH_UPDATE_F_ADMIN);
111 if (error)
112 pr_crit("neigh_update failed with %d\n", error);
113 goto out;
114 }
115 pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc);
116 out:
117 netif_tx_unlock_bh(entry->neigh->dev);
118 }
119
120 /* The neighbour entry n->lock is held. */
121 static int neigh_check_cb(struct neighbour *n)
122 {
123 struct atmarp_entry *entry = neighbour_priv(n);
124 struct clip_vcc *cv;
125
126 for (cv = entry->vccs; cv; cv = cv->next) {
127 unsigned long exp = cv->last_use + cv->idle_timeout;
128
129 if (cv->idle_timeout && time_after(jiffies, exp)) {
130 pr_debug("releasing vcc %p->%p of entry %p\n",
131 cv, cv->vcc, entry);
132 vcc_release_async(cv->vcc, -ETIMEDOUT);
133 }
134 }
135
136 if (entry->vccs || time_before(jiffies, entry->expires))
137 return 0;
138
139 if (atomic_read(&n->refcnt) > 1) {
140 struct sk_buff *skb;
141
142 pr_debug("destruction postponed with ref %d\n",
143 atomic_read(&n->refcnt));
144
145 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
146 dev_kfree_skb(skb);
147
148 return 0;
149 }
150
151 pr_debug("expired neigh %p\n", n);
152 return 1;
153 }
154
155 static void idle_timer_check(unsigned long dummy)
156 {
157 write_lock(&clip_tbl.lock);
158 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
159 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
160 write_unlock(&clip_tbl.lock);
161 }
162
163 static int clip_arp_rcv(struct sk_buff *skb)
164 {
165 struct atm_vcc *vcc;
166
167 pr_debug("\n");
168 vcc = ATM_SKB(skb)->vcc;
169 if (!vcc || !atm_charge(vcc, skb->truesize)) {
170 dev_kfree_skb_any(skb);
171 return 0;
172 }
173 pr_debug("pushing to %p\n", vcc);
174 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
175 CLIP_VCC(vcc)->old_push(vcc, skb);
176 return 0;
177 }
178
179 static const unsigned char llc_oui[] = {
180 0xaa, /* DSAP: non-ISO */
181 0xaa, /* SSAP: non-ISO */
182 0x03, /* Ctrl: Unnumbered Information Command PDU */
183 0x00, /* OUI: EtherType */
184 0x00,
185 0x00
186 };
187
188 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
189 {
190 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
191
192 pr_debug("\n");
193
194 if (!clip_devs) {
195 atm_return(vcc, skb->truesize);
196 kfree_skb(skb);
197 return;
198 }
199
200 if (!skb) {
201 pr_debug("removing VCC %p\n", clip_vcc);
202 if (clip_vcc->entry)
203 unlink_clip_vcc(clip_vcc);
204 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
205 kfree(clip_vcc);
206 return;
207 }
208 atm_return(vcc, skb->truesize);
209 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
210 /* clip_vcc->entry == NULL if we don't have an IP address yet */
211 if (!skb->dev) {
212 dev_kfree_skb_any(skb);
213 return;
214 }
215 ATM_SKB(skb)->vcc = vcc;
216 skb_reset_mac_header(skb);
217 if (!clip_vcc->encap ||
218 skb->len < RFC1483LLC_LEN ||
219 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
220 skb->protocol = htons(ETH_P_IP);
221 else {
222 skb->protocol = ((__be16 *)skb->data)[3];
223 skb_pull(skb, RFC1483LLC_LEN);
224 if (skb->protocol == htons(ETH_P_ARP)) {
225 skb->dev->stats.rx_packets++;
226 skb->dev->stats.rx_bytes += skb->len;
227 clip_arp_rcv(skb);
228 return;
229 }
230 }
231 clip_vcc->last_use = jiffies;
232 skb->dev->stats.rx_packets++;
233 skb->dev->stats.rx_bytes += skb->len;
234 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
235 netif_rx(skb);
236 }
237
238 /*
239 * 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 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
244 {
245 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
246 struct net_device *dev = skb->dev;
247 int old;
248 unsigned long flags;
249
250 pr_debug("(vcc %p)\n", vcc);
251 clip_vcc->old_pop(vcc, skb);
252 /* skb->dev == NULL in outbound ARP packets */
253 if (!dev)
254 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)
259 netif_wake_queue(dev);
260 }
261 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
262 }
263
264 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
265 {
266 __be32 *ip = (__be32 *) neigh->primary_key;
267
268 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
269 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
270 }
271
272 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
273 {
274 #ifndef CONFIG_ATM_CLIP_NO_ICMP
275 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
276 #endif
277 kfree_skb(skb);
278 }
279
280 static const struct neigh_ops clip_neigh_ops = {
281 .family = AF_INET,
282 .solicit = clip_neigh_solicit,
283 .error_report = clip_neigh_error,
284 .output = neigh_direct_output,
285 .connected_output = neigh_direct_output,
286 };
287
288 static int clip_constructor(struct neighbour *neigh)
289 {
290 struct atmarp_entry *entry = neighbour_priv(neigh);
291
292 if (neigh->tbl->family != AF_INET)
293 return -EINVAL;
294
295 if (neigh->type != RTN_UNICAST)
296 return -EINVAL;
297
298 neigh->nud_state = NUD_NONE;
299 neigh->ops = &clip_neigh_ops;
300 neigh->output = neigh->ops->output;
301 entry->neigh = neigh;
302 entry->vccs = NULL;
303 entry->expires = jiffies - 1;
304
305 return 0;
306 }
307
308 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
309
310 /*
311 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
312 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
313 * don't increment the usage count. This is used to create entries in
314 * clip_setentry.
315 */
316
317 static int clip_encap(struct atm_vcc *vcc, int mode)
318 {
319 CLIP_VCC(vcc)->encap = mode;
320 return 0;
321 }
322
323 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
324 struct net_device *dev)
325 {
326 struct clip_priv *clip_priv = PRIV(dev);
327 struct dst_entry *dst = skb_dst(skb);
328 struct atmarp_entry *entry;
329 struct neighbour *n;
330 struct atm_vcc *vcc;
331 int old;
332 unsigned long flags;
333
334 pr_debug("(skb %p)\n", skb);
335 if (!dst) {
336 pr_err("skb_dst(skb) == NULL\n");
337 dev_kfree_skb(skb);
338 dev->stats.tx_dropped++;
339 return NETDEV_TX_OK;
340 }
341 n = dst_get_neighbour_noref(dst);
342 if (!n) {
343 pr_err("NO NEIGHBOUR !\n");
344 dev_kfree_skb(skb);
345 dev->stats.tx_dropped++;
346 return NETDEV_TX_OK;
347 }
348 entry = neighbour_priv(n);
349 if (!entry->vccs) {
350 if (time_after(jiffies, entry->expires)) {
351 /* should be resolved */
352 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
353 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
354 }
355 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
356 skb_queue_tail(&entry->neigh->arp_queue, skb);
357 else {
358 dev_kfree_skb(skb);
359 dev->stats.tx_dropped++;
360 }
361 return NETDEV_TX_OK;
362 }
363 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
364 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
365 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
366 if (entry->vccs->encap) {
367 void *here;
368
369 here = skb_push(skb, RFC1483LLC_LEN);
370 memcpy(here, llc_oui, sizeof(llc_oui));
371 ((__be16 *) here)[3] = skb->protocol;
372 }
373 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
374 ATM_SKB(skb)->atm_options = vcc->atm_options;
375 entry->vccs->last_use = jiffies;
376 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
377 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
378 if (old) {
379 pr_warning("XOFF->XOFF transition\n");
380 return NETDEV_TX_OK;
381 }
382 dev->stats.tx_packets++;
383 dev->stats.tx_bytes += skb->len;
384 vcc->send(vcc, skb);
385 if (atm_may_send(vcc, 0)) {
386 entry->vccs->xoff = 0;
387 return NETDEV_TX_OK;
388 }
389 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
390 netif_stop_queue(dev); /* XOFF -> throttle immediately */
391 barrier();
392 if (!entry->vccs->xoff)
393 netif_start_queue(dev);
394 /* Oh, we just raced with clip_pop. netif_start_queue should be
395 good enough, because nothing should really be asleep because
396 of the brief netif_stop_queue. If this isn't true or if it
397 changes, use netif_wake_queue instead. */
398 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
399 return NETDEV_TX_OK;
400 }
401
402 static int clip_mkip(struct atm_vcc *vcc, int timeout)
403 {
404 struct clip_vcc *clip_vcc;
405
406 if (!vcc->push)
407 return -EBADFD;
408 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
409 if (!clip_vcc)
410 return -ENOMEM;
411 pr_debug("%p vcc %p\n", clip_vcc, vcc);
412 clip_vcc->vcc = vcc;
413 vcc->user_back = clip_vcc;
414 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
415 clip_vcc->entry = NULL;
416 clip_vcc->xoff = 0;
417 clip_vcc->encap = 1;
418 clip_vcc->last_use = jiffies;
419 clip_vcc->idle_timeout = timeout * HZ;
420 clip_vcc->old_push = vcc->push;
421 clip_vcc->old_pop = vcc->pop;
422 vcc->push = clip_push;
423 vcc->pop = clip_pop;
424
425 /* re-process everything received between connection setup and MKIP */
426 vcc_process_recv_queue(vcc);
427
428 return 0;
429 }
430
431 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
432 {
433 struct neighbour *neigh;
434 struct atmarp_entry *entry;
435 int error;
436 struct clip_vcc *clip_vcc;
437 struct rtable *rt;
438
439 if (vcc->push != clip_push) {
440 pr_warning("non-CLIP VCC\n");
441 return -EBADF;
442 }
443 clip_vcc = CLIP_VCC(vcc);
444 if (!ip) {
445 if (!clip_vcc->entry) {
446 pr_err("hiding hidden ATMARP entry\n");
447 return 0;
448 }
449 pr_debug("remove\n");
450 unlink_clip_vcc(clip_vcc);
451 return 0;
452 }
453 rt = ip_route_output(&init_net, ip, 0, 1, 0);
454 if (IS_ERR(rt))
455 return PTR_ERR(rt);
456 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
457 ip_rt_put(rt);
458 if (!neigh)
459 return -ENOMEM;
460 entry = neighbour_priv(neigh);
461 if (entry != clip_vcc->entry) {
462 if (!clip_vcc->entry)
463 pr_debug("add\n");
464 else {
465 pr_debug("update\n");
466 unlink_clip_vcc(clip_vcc);
467 }
468 link_vcc(clip_vcc, entry);
469 }
470 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
471 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
472 neigh_release(neigh);
473 return error;
474 }
475
476 static const struct net_device_ops clip_netdev_ops = {
477 .ndo_start_xmit = clip_start_xmit,
478 .ndo_neigh_construct = clip_constructor,
479 };
480
481 static void clip_setup(struct net_device *dev)
482 {
483 dev->netdev_ops = &clip_netdev_ops;
484 dev->type = ARPHRD_ATM;
485 dev->neigh_priv_len = sizeof(struct atmarp_entry);
486 dev->hard_header_len = RFC1483LLC_LEN;
487 dev->mtu = RFC1626_MTU;
488 dev->tx_queue_len = 100; /* "normal" queue (packets) */
489 /* When using a "real" qdisc, the qdisc determines the queue */
490 /* length. tx_queue_len is only used for the default case, */
491 /* without any more elaborate queuing. 100 is a reasonable */
492 /* compromise between decent burst-tolerance and protection */
493 /* against memory hogs. */
494 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
495 }
496
497 static int clip_create(int number)
498 {
499 struct net_device *dev;
500 struct clip_priv *clip_priv;
501 int error;
502
503 if (number != -1) {
504 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
505 if (PRIV(dev)->number == number)
506 return -EEXIST;
507 } else {
508 number = 0;
509 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
510 if (PRIV(dev)->number >= number)
511 number = PRIV(dev)->number + 1;
512 }
513 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
514 if (!dev)
515 return -ENOMEM;
516 clip_priv = PRIV(dev);
517 sprintf(dev->name, "atm%d", number);
518 spin_lock_init(&clip_priv->xoff_lock);
519 clip_priv->number = number;
520 error = register_netdev(dev);
521 if (error) {
522 free_netdev(dev);
523 return error;
524 }
525 clip_priv->next = clip_devs;
526 clip_devs = dev;
527 pr_debug("registered (net:%s)\n", dev->name);
528 return number;
529 }
530
531 static int clip_device_event(struct notifier_block *this, unsigned long event,
532 void *arg)
533 {
534 struct net_device *dev = arg;
535
536 if (!net_eq(dev_net(dev), &init_net))
537 return NOTIFY_DONE;
538
539 if (event == NETDEV_UNREGISTER)
540 return NOTIFY_DONE;
541
542 /* ignore non-CLIP devices */
543 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
544 return NOTIFY_DONE;
545
546 switch (event) {
547 case NETDEV_UP:
548 pr_debug("NETDEV_UP\n");
549 to_atmarpd(act_up, PRIV(dev)->number, 0);
550 break;
551 case NETDEV_GOING_DOWN:
552 pr_debug("NETDEV_DOWN\n");
553 to_atmarpd(act_down, PRIV(dev)->number, 0);
554 break;
555 case NETDEV_CHANGE:
556 case NETDEV_CHANGEMTU:
557 pr_debug("NETDEV_CHANGE*\n");
558 to_atmarpd(act_change, PRIV(dev)->number, 0);
559 break;
560 }
561 return NOTIFY_DONE;
562 }
563
564 static int clip_inet_event(struct notifier_block *this, unsigned long event,
565 void *ifa)
566 {
567 struct in_device *in_dev;
568
569 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
570 /*
571 * Transitions are of the down-change-up type, so it's sufficient to
572 * handle the change on up.
573 */
574 if (event != NETDEV_UP)
575 return NOTIFY_DONE;
576 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
577 }
578
579 static struct notifier_block clip_dev_notifier = {
580 .notifier_call = clip_device_event,
581 };
582
583
584
585 static struct notifier_block clip_inet_notifier = {
586 .notifier_call = clip_inet_event,
587 };
588
589
590
591 static void atmarpd_close(struct atm_vcc *vcc)
592 {
593 pr_debug("\n");
594
595 rtnl_lock();
596 atmarpd = NULL;
597 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
598 rtnl_unlock();
599
600 pr_debug("(done)\n");
601 module_put(THIS_MODULE);
602 }
603
604 static struct atmdev_ops atmarpd_dev_ops = {
605 .close = atmarpd_close
606 };
607
608
609 static struct atm_dev atmarpd_dev = {
610 .ops = &atmarpd_dev_ops,
611 .type = "arpd",
612 .number = 999,
613 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
614 };
615
616
617 static int atm_init_atmarp(struct atm_vcc *vcc)
618 {
619 rtnl_lock();
620 if (atmarpd) {
621 rtnl_unlock();
622 return -EADDRINUSE;
623 }
624
625 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
626
627 atmarpd = vcc;
628 set_bit(ATM_VF_META, &vcc->flags);
629 set_bit(ATM_VF_READY, &vcc->flags);
630 /* allow replies and avoid getting closed if signaling dies */
631 vcc->dev = &atmarpd_dev;
632 vcc_insert_socket(sk_atm(vcc));
633 vcc->push = NULL;
634 vcc->pop = NULL; /* crash */
635 vcc->push_oam = NULL; /* crash */
636 rtnl_unlock();
637 return 0;
638 }
639
640 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
641 {
642 struct atm_vcc *vcc = ATM_SD(sock);
643 int err = 0;
644
645 switch (cmd) {
646 case SIOCMKCLIP:
647 case ATMARPD_CTRL:
648 case ATMARP_MKIP:
649 case ATMARP_SETENTRY:
650 case ATMARP_ENCAP:
651 if (!capable(CAP_NET_ADMIN))
652 return -EPERM;
653 break;
654 default:
655 return -ENOIOCTLCMD;
656 }
657
658 switch (cmd) {
659 case SIOCMKCLIP:
660 err = clip_create(arg);
661 break;
662 case ATMARPD_CTRL:
663 err = atm_init_atmarp(vcc);
664 if (!err) {
665 sock->state = SS_CONNECTED;
666 __module_get(THIS_MODULE);
667 }
668 break;
669 case ATMARP_MKIP:
670 err = clip_mkip(vcc, arg);
671 break;
672 case ATMARP_SETENTRY:
673 err = clip_setentry(vcc, (__force __be32)arg);
674 break;
675 case ATMARP_ENCAP:
676 err = clip_encap(vcc, arg);
677 break;
678 }
679 return err;
680 }
681
682 static struct atm_ioctl clip_ioctl_ops = {
683 .owner = THIS_MODULE,
684 .ioctl = clip_ioctl,
685 };
686
687 #ifdef CONFIG_PROC_FS
688
689 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
690 {
691 static int code[] = { 1, 2, 10, 6, 1, 0 };
692 static int e164[] = { 1, 8, 4, 6, 1, 0 };
693
694 if (*addr->sas_addr.pub) {
695 seq_printf(seq, "%s", addr->sas_addr.pub);
696 if (*addr->sas_addr.prv)
697 seq_putc(seq, '+');
698 } else if (!*addr->sas_addr.prv) {
699 seq_printf(seq, "%s", "(none)");
700 return;
701 }
702 if (*addr->sas_addr.prv) {
703 unsigned char *prv = addr->sas_addr.prv;
704 int *fields;
705 int i, j;
706
707 fields = *prv == ATM_AFI_E164 ? e164 : code;
708 for (i = 0; fields[i]; i++) {
709 for (j = fields[i]; j; j--)
710 seq_printf(seq, "%02X", *prv++);
711 if (fields[i + 1])
712 seq_putc(seq, '.');
713 }
714 }
715 }
716
717 /* This means the neighbour entry has no attached VCC objects. */
718 #define SEQ_NO_VCC_TOKEN ((void *) 2)
719
720 static void atmarp_info(struct seq_file *seq, struct neighbour *n,
721 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
722 {
723 struct net_device *dev = n->dev;
724 unsigned long exp;
725 char buf[17];
726 int svc, llc, off;
727
728 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
729 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
730
731 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
732
733 if (clip_vcc == SEQ_NO_VCC_TOKEN)
734 exp = entry->neigh->used;
735 else
736 exp = clip_vcc->last_use;
737
738 exp = (jiffies - exp) / HZ;
739
740 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
741 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
742
743 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
744 while (off < 16)
745 buf[off++] = ' ';
746 buf[off] = '\0';
747 seq_printf(seq, "%s", buf);
748
749 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
750 if (time_before(jiffies, entry->expires))
751 seq_printf(seq, "(resolving)\n");
752 else
753 seq_printf(seq, "(expired, ref %d)\n",
754 atomic_read(&entry->neigh->refcnt));
755 } else if (!svc) {
756 seq_printf(seq, "%d.%d.%d\n",
757 clip_vcc->vcc->dev->number,
758 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
759 } else {
760 svc_addr(seq, &clip_vcc->vcc->remote);
761 seq_putc(seq, '\n');
762 }
763 }
764
765 struct clip_seq_state {
766 /* This member must be first. */
767 struct neigh_seq_state ns;
768
769 /* Local to clip specific iteration. */
770 struct clip_vcc *vcc;
771 };
772
773 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
774 struct clip_vcc *curr)
775 {
776 if (!curr) {
777 curr = e->vccs;
778 if (!curr)
779 return SEQ_NO_VCC_TOKEN;
780 return curr;
781 }
782 if (curr == SEQ_NO_VCC_TOKEN)
783 return NULL;
784
785 curr = curr->next;
786
787 return curr;
788 }
789
790 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
791 struct atmarp_entry *e, loff_t * pos)
792 {
793 struct clip_vcc *vcc = state->vcc;
794
795 vcc = clip_seq_next_vcc(e, vcc);
796 if (vcc && pos != NULL) {
797 while (*pos) {
798 vcc = clip_seq_next_vcc(e, vcc);
799 if (!vcc)
800 break;
801 --(*pos);
802 }
803 }
804 state->vcc = vcc;
805
806 return vcc;
807 }
808
809 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
810 struct neighbour *n, loff_t * pos)
811 {
812 struct clip_seq_state *state = (struct clip_seq_state *)_state;
813
814 if (n->dev->type != ARPHRD_ATM)
815 return NULL;
816
817 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
818 }
819
820 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
821 {
822 struct clip_seq_state *state = seq->private;
823 state->ns.neigh_sub_iter = clip_seq_sub_iter;
824 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
825 }
826
827 static int clip_seq_show(struct seq_file *seq, void *v)
828 {
829 static char atm_arp_banner[] =
830 "IPitf TypeEncp Idle IP address ATM address\n";
831
832 if (v == SEQ_START_TOKEN) {
833 seq_puts(seq, atm_arp_banner);
834 } else {
835 struct clip_seq_state *state = seq->private;
836 struct clip_vcc *vcc = state->vcc;
837 struct neighbour *n = v;
838
839 atmarp_info(seq, n, neighbour_priv(n), vcc);
840 }
841 return 0;
842 }
843
844 static const struct seq_operations arp_seq_ops = {
845 .start = clip_seq_start,
846 .next = neigh_seq_next,
847 .stop = neigh_seq_stop,
848 .show = clip_seq_show,
849 };
850
851 static int arp_seq_open(struct inode *inode, struct file *file)
852 {
853 return seq_open_net(inode, file, &arp_seq_ops,
854 sizeof(struct clip_seq_state));
855 }
856
857 static const struct file_operations arp_seq_fops = {
858 .open = arp_seq_open,
859 .read = seq_read,
860 .llseek = seq_lseek,
861 .release = seq_release_net,
862 .owner = THIS_MODULE
863 };
864 #endif
865
866 static void atm_clip_exit_noproc(void);
867
868 static int __init atm_clip_init(void)
869 {
870 register_atm_ioctl(&clip_ioctl_ops);
871 register_netdevice_notifier(&clip_dev_notifier);
872 register_inetaddr_notifier(&clip_inet_notifier);
873
874 setup_timer(&idle_timer, idle_timer_check, 0);
875
876 #ifdef CONFIG_PROC_FS
877 {
878 struct proc_dir_entry *p;
879
880 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
881 if (!p) {
882 pr_err("Unable to initialize /proc/net/atm/arp\n");
883 atm_clip_exit_noproc();
884 return -ENOMEM;
885 }
886 }
887 #endif
888
889 return 0;
890 }
891
892 static void atm_clip_exit_noproc(void)
893 {
894 struct net_device *dev, *next;
895
896 unregister_inetaddr_notifier(&clip_inet_notifier);
897 unregister_netdevice_notifier(&clip_dev_notifier);
898
899 deregister_atm_ioctl(&clip_ioctl_ops);
900
901 /* First, stop the idle timer, so it stops banging
902 * on the table.
903 */
904 del_timer_sync(&idle_timer);
905
906 dev = clip_devs;
907 while (dev) {
908 next = PRIV(dev)->next;
909 unregister_netdev(dev);
910 free_netdev(dev);
911 dev = next;
912 }
913 }
914
915 static void __exit atm_clip_exit(void)
916 {
917 remove_proc_entry("arp", atm_proc_root);
918
919 atm_clip_exit_noproc();
920 }
921
922 module_init(atm_clip_init);
923 module_exit(atm_clip_exit);
924 MODULE_AUTHOR("Werner Almesberger");
925 MODULE_DESCRIPTION("Classical/IP over ATM interface");
926 MODULE_LICENSE("GPL");