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nfsd: don't fail unchecked creates of non-special files
[zen-stable.git] / net / atm / clip.c
blob127fe70a1baa3d8ecf937b76367767b9bf46f9e0
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 timer_list idle_timer;
50 static const struct neigh_ops clip_neigh_ops;
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 if (n->ops != &clip_neigh_ops)
127 return 0;
128 for (cv = entry->vccs; cv; cv = cv->next) {
129 unsigned long exp = cv->last_use + cv->idle_timeout;
130
131 if (cv->idle_timeout && time_after(jiffies, exp)) {
132 pr_debug("releasing vcc %p->%p of entry %p\n",
133 cv, cv->vcc, entry);
134 vcc_release_async(cv->vcc, -ETIMEDOUT);
135 }
136 }
137
138 if (entry->vccs || time_before(jiffies, entry->expires))
139 return 0;
140
141 if (atomic_read(&n->refcnt) > 1) {
142 struct sk_buff *skb;
143
144 pr_debug("destruction postponed with ref %d\n",
145 atomic_read(&n->refcnt));
146
147 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
148 dev_kfree_skb(skb);
149
150 return 0;
151 }
152
153 pr_debug("expired neigh %p\n", n);
154 return 1;
155 }
156
157 static void idle_timer_check(unsigned long dummy)
158 {
159 write_lock(&arp_tbl.lock);
160 __neigh_for_each_release(&arp_tbl, neigh_check_cb);
161 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
162 write_unlock(&arp_tbl.lock);
163 }
164
165 static int clip_arp_rcv(struct sk_buff *skb)
166 {
167 struct atm_vcc *vcc;
168
169 pr_debug("\n");
170 vcc = ATM_SKB(skb)->vcc;
171 if (!vcc || !atm_charge(vcc, skb->truesize)) {
172 dev_kfree_skb_any(skb);
173 return 0;
174 }
175 pr_debug("pushing to %p\n", vcc);
176 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
177 CLIP_VCC(vcc)->old_push(vcc, skb);
178 return 0;
179 }
180
181 static const unsigned char llc_oui[] = {
182 0xaa, /* DSAP: non-ISO */
183 0xaa, /* SSAP: non-ISO */
184 0x03, /* Ctrl: Unnumbered Information Command PDU */
185 0x00, /* OUI: EtherType */
186 0x00,
187 0x00
188 };
189
190 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
191 {
192 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
193
194 pr_debug("\n");
195
196 if (!clip_devs) {
197 atm_return(vcc, skb->truesize);
198 kfree_skb(skb);
199 return;
200 }
201
202 if (!skb) {
203 pr_debug("removing VCC %p\n", clip_vcc);
204 if (clip_vcc->entry)
205 unlink_clip_vcc(clip_vcc);
206 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
207 kfree(clip_vcc);
208 return;
209 }
210 atm_return(vcc, skb->truesize);
211 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
212 /* clip_vcc->entry == NULL if we don't have an IP address yet */
213 if (!skb->dev) {
214 dev_kfree_skb_any(skb);
215 return;
216 }
217 ATM_SKB(skb)->vcc = vcc;
218 skb_reset_mac_header(skb);
219 if (!clip_vcc->encap ||
220 skb->len < RFC1483LLC_LEN ||
221 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
222 skb->protocol = htons(ETH_P_IP);
223 else {
224 skb->protocol = ((__be16 *)skb->data)[3];
225 skb_pull(skb, RFC1483LLC_LEN);
226 if (skb->protocol == htons(ETH_P_ARP)) {
227 skb->dev->stats.rx_packets++;
228 skb->dev->stats.rx_bytes += skb->len;
229 clip_arp_rcv(skb);
230 return;
231 }
232 }
233 clip_vcc->last_use = jiffies;
234 skb->dev->stats.rx_packets++;
235 skb->dev->stats.rx_bytes += skb->len;
236 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
237 netif_rx(skb);
238 }
239
240 /*
241 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
242 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
243 */
244
245 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
246 {
247 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
248 struct net_device *dev = skb->dev;
249 int old;
250 unsigned long flags;
251
252 pr_debug("(vcc %p)\n", vcc);
253 clip_vcc->old_pop(vcc, skb);
254 /* skb->dev == NULL in outbound ARP packets */
255 if (!dev)
256 return;
257 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
258 if (atm_may_send(vcc, 0)) {
259 old = xchg(&clip_vcc->xoff, 0);
260 if (old)
261 netif_wake_queue(dev);
262 }
263 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
264 }
265
266 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
267 {
268 __be32 *ip = (__be32 *) neigh->primary_key;
269
270 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
271 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
272 }
273
274 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
275 {
276 #ifndef CONFIG_ATM_CLIP_NO_ICMP
277 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
278 #endif
279 kfree_skb(skb);
280 }
281
282 static const struct neigh_ops clip_neigh_ops = {
283 .family = AF_INET,
284 .solicit = clip_neigh_solicit,
285 .error_report = clip_neigh_error,
286 .output = neigh_direct_output,
287 .connected_output = neigh_direct_output,
288 };
289
290 static int clip_constructor(struct neighbour *neigh)
291 {
292 struct atmarp_entry *entry = neighbour_priv(neigh);
293
294 if (neigh->tbl->family != AF_INET)
295 return -EINVAL;
296
297 if (neigh->type != RTN_UNICAST)
298 return -EINVAL;
299
300 neigh->nud_state = NUD_NONE;
301 neigh->ops = &clip_neigh_ops;
302 neigh->output = neigh->ops->output;
303 entry->neigh = neigh;
304 entry->vccs = NULL;
305 entry->expires = jiffies - 1;
306
307 return 0;
308 }
309
310 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
311
312 /*
313 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
314 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
315 * don't increment the usage count. This is used to create entries in
316 * clip_setentry.
317 */
318
319 static int clip_encap(struct atm_vcc *vcc, int mode)
320 {
321 CLIP_VCC(vcc)->encap = mode;
322 return 0;
323 }
324
325 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
326 struct net_device *dev)
327 {
328 struct clip_priv *clip_priv = PRIV(dev);
329 struct dst_entry *dst = skb_dst(skb);
330 struct atmarp_entry *entry;
331 struct neighbour *n;
332 struct atm_vcc *vcc;
333 int old;
334 unsigned long flags;
335
336 pr_debug("(skb %p)\n", skb);
337 if (!dst) {
338 pr_err("skb_dst(skb) == NULL\n");
339 dev_kfree_skb(skb);
340 dev->stats.tx_dropped++;
341 return NETDEV_TX_OK;
342 }
343 n = dst_get_neighbour_noref(dst);
344 if (!n) {
345 pr_err("NO NEIGHBOUR !\n");
346 dev_kfree_skb(skb);
347 dev->stats.tx_dropped++;
348 return NETDEV_TX_OK;
349 }
350 entry = neighbour_priv(n);
351 if (!entry->vccs) {
352 if (time_after(jiffies, entry->expires)) {
353 /* should be resolved */
354 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
355 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
356 }
357 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
358 skb_queue_tail(&entry->neigh->arp_queue, skb);
359 else {
360 dev_kfree_skb(skb);
361 dev->stats.tx_dropped++;
362 }
363 return NETDEV_TX_OK;
364 }
365 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
366 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
367 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
368 if (entry->vccs->encap) {
369 void *here;
370
371 here = skb_push(skb, RFC1483LLC_LEN);
372 memcpy(here, llc_oui, sizeof(llc_oui));
373 ((__be16 *) here)[3] = skb->protocol;
374 }
375 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
376 ATM_SKB(skb)->atm_options = vcc->atm_options;
377 entry->vccs->last_use = jiffies;
378 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
379 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
380 if (old) {
381 pr_warning("XOFF->XOFF transition\n");
382 return NETDEV_TX_OK;
383 }
384 dev->stats.tx_packets++;
385 dev->stats.tx_bytes += skb->len;
386 vcc->send(vcc, skb);
387 if (atm_may_send(vcc, 0)) {
388 entry->vccs->xoff = 0;
389 return NETDEV_TX_OK;
390 }
391 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
392 netif_stop_queue(dev); /* XOFF -> throttle immediately */
393 barrier();
394 if (!entry->vccs->xoff)
395 netif_start_queue(dev);
396 /* Oh, we just raced with clip_pop. netif_start_queue should be
397 good enough, because nothing should really be asleep because
398 of the brief netif_stop_queue. If this isn't true or if it
399 changes, use netif_wake_queue instead. */
400 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
401 return NETDEV_TX_OK;
402 }
403
404 static int clip_mkip(struct atm_vcc *vcc, int timeout)
405 {
406 struct clip_vcc *clip_vcc;
407
408 if (!vcc->push)
409 return -EBADFD;
410 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
411 if (!clip_vcc)
412 return -ENOMEM;
413 pr_debug("%p vcc %p\n", clip_vcc, vcc);
414 clip_vcc->vcc = vcc;
415 vcc->user_back = clip_vcc;
416 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
417 clip_vcc->entry = NULL;
418 clip_vcc->xoff = 0;
419 clip_vcc->encap = 1;
420 clip_vcc->last_use = jiffies;
421 clip_vcc->idle_timeout = timeout * HZ;
422 clip_vcc->old_push = vcc->push;
423 clip_vcc->old_pop = vcc->pop;
424 vcc->push = clip_push;
425 vcc->pop = clip_pop;
426
427 /* re-process everything received between connection setup and MKIP */
428 vcc_process_recv_queue(vcc);
429
430 return 0;
431 }
432
433 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
434 {
435 struct neighbour *neigh;
436 struct atmarp_entry *entry;
437 int error;
438 struct clip_vcc *clip_vcc;
439 struct rtable *rt;
440
441 if (vcc->push != clip_push) {
442 pr_warning("non-CLIP VCC\n");
443 return -EBADF;
444 }
445 clip_vcc = CLIP_VCC(vcc);
446 if (!ip) {
447 if (!clip_vcc->entry) {
448 pr_err("hiding hidden ATMARP entry\n");
449 return 0;
450 }
451 pr_debug("remove\n");
452 unlink_clip_vcc(clip_vcc);
453 return 0;
454 }
455 rt = ip_route_output(&init_net, ip, 0, 1, 0);
456 if (IS_ERR(rt))
457 return PTR_ERR(rt);
458 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
459 ip_rt_put(rt);
460 if (!neigh)
461 return -ENOMEM;
462 entry = neighbour_priv(neigh);
463 if (entry != clip_vcc->entry) {
464 if (!clip_vcc->entry)
465 pr_debug("add\n");
466 else {
467 pr_debug("update\n");
468 unlink_clip_vcc(clip_vcc);
469 }
470 link_vcc(clip_vcc, entry);
471 }
472 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
473 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
474 neigh_release(neigh);
475 return error;
476 }
477
478 static const struct net_device_ops clip_netdev_ops = {
479 .ndo_start_xmit = clip_start_xmit,
480 .ndo_neigh_construct = clip_constructor,
481 };
482
483 static void clip_setup(struct net_device *dev)
484 {
485 dev->netdev_ops = &clip_netdev_ops;
486 dev->type = ARPHRD_ATM;
487 dev->neigh_priv_len = sizeof(struct atmarp_entry);
488 dev->hard_header_len = RFC1483LLC_LEN;
489 dev->mtu = RFC1626_MTU;
490 dev->tx_queue_len = 100; /* "normal" queue (packets) */
491 /* When using a "real" qdisc, the qdisc determines the queue */
492 /* length. tx_queue_len is only used for the default case, */
493 /* without any more elaborate queuing. 100 is a reasonable */
494 /* compromise between decent burst-tolerance and protection */
495 /* against memory hogs. */
496 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
497 }
498
499 static int clip_create(int number)
500 {
501 struct net_device *dev;
502 struct clip_priv *clip_priv;
503 int error;
504
505 if (number != -1) {
506 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
507 if (PRIV(dev)->number == number)
508 return -EEXIST;
509 } else {
510 number = 0;
511 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
512 if (PRIV(dev)->number >= number)
513 number = PRIV(dev)->number + 1;
514 }
515 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
516 if (!dev)
517 return -ENOMEM;
518 clip_priv = PRIV(dev);
519 sprintf(dev->name, "atm%d", number);
520 spin_lock_init(&clip_priv->xoff_lock);
521 clip_priv->number = number;
522 error = register_netdev(dev);
523 if (error) {
524 free_netdev(dev);
525 return error;
526 }
527 clip_priv->next = clip_devs;
528 clip_devs = dev;
529 pr_debug("registered (net:%s)\n", dev->name);
530 return number;
531 }
532
533 static int clip_device_event(struct notifier_block *this, unsigned long event,
534 void *arg)
535 {
536 struct net_device *dev = arg;
537
538 if (!net_eq(dev_net(dev), &init_net))
539 return NOTIFY_DONE;
540
541 if (event == NETDEV_UNREGISTER)
542 return NOTIFY_DONE;
543
544 /* ignore non-CLIP devices */
545 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
546 return NOTIFY_DONE;
547
548 switch (event) {
549 case NETDEV_UP:
550 pr_debug("NETDEV_UP\n");
551 to_atmarpd(act_up, PRIV(dev)->number, 0);
552 break;
553 case NETDEV_GOING_DOWN:
554 pr_debug("NETDEV_DOWN\n");
555 to_atmarpd(act_down, PRIV(dev)->number, 0);
556 break;
557 case NETDEV_CHANGE:
558 case NETDEV_CHANGEMTU:
559 pr_debug("NETDEV_CHANGE*\n");
560 to_atmarpd(act_change, PRIV(dev)->number, 0);
561 break;
562 }
563 return NOTIFY_DONE;
564 }
565
566 static int clip_inet_event(struct notifier_block *this, unsigned long event,
567 void *ifa)
568 {
569 struct in_device *in_dev;
570
571 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
572 /*
573 * Transitions are of the down-change-up type, so it's sufficient to
574 * handle the change on up.
575 */
576 if (event != NETDEV_UP)
577 return NOTIFY_DONE;
578 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
579 }
580
581 static struct notifier_block clip_dev_notifier = {
582 .notifier_call = clip_device_event,
583 };
584
585
586
587 static struct notifier_block clip_inet_notifier = {
588 .notifier_call = clip_inet_event,
589 };
590
591
592
593 static void atmarpd_close(struct atm_vcc *vcc)
594 {
595 pr_debug("\n");
596
597 rtnl_lock();
598 atmarpd = NULL;
599 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
600 rtnl_unlock();
601
602 pr_debug("(done)\n");
603 module_put(THIS_MODULE);
604 }
605
606 static struct atmdev_ops atmarpd_dev_ops = {
607 .close = atmarpd_close
608 };
609
610
611 static struct atm_dev atmarpd_dev = {
612 .ops = &atmarpd_dev_ops,
613 .type = "arpd",
614 .number = 999,
615 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
616 };
617
618
619 static int atm_init_atmarp(struct atm_vcc *vcc)
620 {
621 rtnl_lock();
622 if (atmarpd) {
623 rtnl_unlock();
624 return -EADDRINUSE;
625 }
626
627 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
628
629 atmarpd = vcc;
630 set_bit(ATM_VF_META, &vcc->flags);
631 set_bit(ATM_VF_READY, &vcc->flags);
632 /* allow replies and avoid getting closed if signaling dies */
633 vcc->dev = &atmarpd_dev;
634 vcc_insert_socket(sk_atm(vcc));
635 vcc->push = NULL;
636 vcc->pop = NULL; /* crash */
637 vcc->push_oam = NULL; /* crash */
638 rtnl_unlock();
639 return 0;
640 }
641
642 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
643 {
644 struct atm_vcc *vcc = ATM_SD(sock);
645 int err = 0;
646
647 switch (cmd) {
648 case SIOCMKCLIP:
649 case ATMARPD_CTRL:
650 case ATMARP_MKIP:
651 case ATMARP_SETENTRY:
652 case ATMARP_ENCAP:
653 if (!capable(CAP_NET_ADMIN))
654 return -EPERM;
655 break;
656 default:
657 return -ENOIOCTLCMD;
658 }
659
660 switch (cmd) {
661 case SIOCMKCLIP:
662 err = clip_create(arg);
663 break;
664 case ATMARPD_CTRL:
665 err = atm_init_atmarp(vcc);
666 if (!err) {
667 sock->state = SS_CONNECTED;
668 __module_get(THIS_MODULE);
669 }
670 break;
671 case ATMARP_MKIP:
672 err = clip_mkip(vcc, arg);
673 break;
674 case ATMARP_SETENTRY:
675 err = clip_setentry(vcc, (__force __be32)arg);
676 break;
677 case ATMARP_ENCAP:
678 err = clip_encap(vcc, arg);
679 break;
680 }
681 return err;
682 }
683
684 static struct atm_ioctl clip_ioctl_ops = {
685 .owner = THIS_MODULE,
686 .ioctl = clip_ioctl,
687 };
688
689 #ifdef CONFIG_PROC_FS
690
691 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
692 {
693 static int code[] = { 1, 2, 10, 6, 1, 0 };
694 static int e164[] = { 1, 8, 4, 6, 1, 0 };
695
696 if (*addr->sas_addr.pub) {
697 seq_printf(seq, "%s", addr->sas_addr.pub);
698 if (*addr->sas_addr.prv)
699 seq_putc(seq, '+');
700 } else if (!*addr->sas_addr.prv) {
701 seq_printf(seq, "%s", "(none)");
702 return;
703 }
704 if (*addr->sas_addr.prv) {
705 unsigned char *prv = addr->sas_addr.prv;
706 int *fields;
707 int i, j;
708
709 fields = *prv == ATM_AFI_E164 ? e164 : code;
710 for (i = 0; fields[i]; i++) {
711 for (j = fields[i]; j; j--)
712 seq_printf(seq, "%02X", *prv++);
713 if (fields[i + 1])
714 seq_putc(seq, '.');
715 }
716 }
717 }
718
719 /* This means the neighbour entry has no attached VCC objects. */
720 #define SEQ_NO_VCC_TOKEN ((void *) 2)
721
722 static void atmarp_info(struct seq_file *seq, struct neighbour *n,
723 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
724 {
725 struct net_device *dev = n->dev;
726 unsigned long exp;
727 char buf[17];
728 int svc, llc, off;
729
730 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
731 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
732
733 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
734
735 if (clip_vcc == SEQ_NO_VCC_TOKEN)
736 exp = entry->neigh->used;
737 else
738 exp = clip_vcc->last_use;
739
740 exp = (jiffies - exp) / HZ;
741
742 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
743 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
744
745 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
746 while (off < 16)
747 buf[off++] = ' ';
748 buf[off] = '\0';
749 seq_printf(seq, "%s", buf);
750
751 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
752 if (time_before(jiffies, entry->expires))
753 seq_printf(seq, "(resolving)\n");
754 else
755 seq_printf(seq, "(expired, ref %d)\n",
756 atomic_read(&entry->neigh->refcnt));
757 } else if (!svc) {
758 seq_printf(seq, "%d.%d.%d\n",
759 clip_vcc->vcc->dev->number,
760 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
761 } else {
762 svc_addr(seq, &clip_vcc->vcc->remote);
763 seq_putc(seq, '\n');
764 }
765 }
766
767 struct clip_seq_state {
768 /* This member must be first. */
769 struct neigh_seq_state ns;
770
771 /* Local to clip specific iteration. */
772 struct clip_vcc *vcc;
773 };
774
775 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
776 struct clip_vcc *curr)
777 {
778 if (!curr) {
779 curr = e->vccs;
780 if (!curr)
781 return SEQ_NO_VCC_TOKEN;
782 return curr;
783 }
784 if (curr == SEQ_NO_VCC_TOKEN)
785 return NULL;
786
787 curr = curr->next;
788
789 return curr;
790 }
791
792 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
793 struct atmarp_entry *e, loff_t * pos)
794 {
795 struct clip_vcc *vcc = state->vcc;
796
797 vcc = clip_seq_next_vcc(e, vcc);
798 if (vcc && pos != NULL) {
799 while (*pos) {
800 vcc = clip_seq_next_vcc(e, vcc);
801 if (!vcc)
802 break;
803 --(*pos);
804 }
805 }
806 state->vcc = vcc;
807
808 return vcc;
809 }
810
811 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
812 struct neighbour *n, loff_t * pos)
813 {
814 struct clip_seq_state *state = (struct clip_seq_state *)_state;
815
816 if (n->dev->type != ARPHRD_ATM)
817 return NULL;
818
819 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
820 }
821
822 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
823 {
824 struct clip_seq_state *state = seq->private;
825 state->ns.neigh_sub_iter = clip_seq_sub_iter;
826 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
827 }
828
829 static int clip_seq_show(struct seq_file *seq, void *v)
830 {
831 static char atm_arp_banner[] =
832 "IPitf TypeEncp Idle IP address ATM address\n";
833
834 if (v == SEQ_START_TOKEN) {
835 seq_puts(seq, atm_arp_banner);
836 } else {
837 struct clip_seq_state *state = seq->private;
838 struct clip_vcc *vcc = state->vcc;
839 struct neighbour *n = v;
840
841 atmarp_info(seq, n, neighbour_priv(n), vcc);
842 }
843 return 0;
844 }
845
846 static const struct seq_operations arp_seq_ops = {
847 .start = clip_seq_start,
848 .next = neigh_seq_next,
849 .stop = neigh_seq_stop,
850 .show = clip_seq_show,
851 };
852
853 static int arp_seq_open(struct inode *inode, struct file *file)
854 {
855 return seq_open_net(inode, file, &arp_seq_ops,
856 sizeof(struct clip_seq_state));
857 }
858
859 static const struct file_operations arp_seq_fops = {
860 .open = arp_seq_open,
861 .read = seq_read,
862 .llseek = seq_lseek,
863 .release = seq_release_net,
864 .owner = THIS_MODULE
865 };
866 #endif
867
868 static void atm_clip_exit_noproc(void);
869
870 static int __init atm_clip_init(void)
871 {
872 register_atm_ioctl(&clip_ioctl_ops);
873 register_netdevice_notifier(&clip_dev_notifier);
874 register_inetaddr_notifier(&clip_inet_notifier);
875
876 setup_timer(&idle_timer, idle_timer_check, 0);
877
878 #ifdef CONFIG_PROC_FS
879 {
880 struct proc_dir_entry *p;
881
882 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
883 if (!p) {
884 pr_err("Unable to initialize /proc/net/atm/arp\n");
885 atm_clip_exit_noproc();
886 return -ENOMEM;
887 }
888 }
889 #endif
890
891 return 0;
892 }
893
894 static void atm_clip_exit_noproc(void)
895 {
896 struct net_device *dev, *next;
897
898 unregister_inetaddr_notifier(&clip_inet_notifier);
899 unregister_netdevice_notifier(&clip_dev_notifier);
900
901 deregister_atm_ioctl(&clip_ioctl_ops);
902
903 /* First, stop the idle timer, so it stops banging
904 * on the table.
905 */
906 del_timer_sync(&idle_timer);
907
908 dev = clip_devs;
909 while (dev) {
910 next = PRIV(dev)->next;
911 unregister_netdev(dev);
912 free_netdev(dev);
913 dev = next;
914 }
915 }
916
917 static void __exit atm_clip_exit(void)
918 {
919 remove_proc_entry("arp", atm_proc_root);
920
921 atm_clip_exit_noproc();
922 }
923
924 module_init(atm_clip_init);
925 module_exit(atm_clip_exit);
926 MODULE_AUTHOR("Werner Almesberger");
927 MODULE_DESCRIPTION("Classical/IP over ATM interface");
928 MODULE_LICENSE("GPL");