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tty: serial: lpuart: avoid leaking struct tty_struct
[linux/fpc-iii.git] / net / atm / clip.c
blobd795b9c5aea4a4e35021d9db2e10254036df55fe
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 <linux/atomic.h>
41
42 #include "common.h"
43 #include "resources.h"
44 #include <net/atmclip.h>
45
46 static struct net_device *clip_devs;
47 static struct atm_vcc *atmarpd;
48 static struct timer_list idle_timer;
49 static const struct neigh_ops clip_neigh_ops;
50
51 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
52 {
53 struct sock *sk;
54 struct atmarp_ctrl *ctrl;
55 struct sk_buff *skb;
56
57 pr_debug("(%d)\n", type);
58 if (!atmarpd)
59 return -EUNATCH;
60 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
61 if (!skb)
62 return -ENOMEM;
63 ctrl = skb_put(skb, sizeof(struct atmarp_ctrl));
64 ctrl->type = type;
65 ctrl->itf_num = itf;
66 ctrl->ip = ip;
67 atm_force_charge(atmarpd, skb->truesize);
68
69 sk = sk_atm(atmarpd);
70 skb_queue_tail(&sk->sk_receive_queue, skb);
71 sk->sk_data_ready(sk);
72 return 0;
73 }
74
75 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
76 {
77 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
78 clip_vcc->entry = entry;
79 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
80 clip_vcc->next = entry->vccs;
81 entry->vccs = clip_vcc;
82 entry->neigh->used = jiffies;
83 }
84
85 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
86 {
87 struct atmarp_entry *entry = clip_vcc->entry;
88 struct clip_vcc **walk;
89
90 if (!entry) {
91 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
92 return;
93 }
94 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
95 entry->neigh->used = jiffies;
96 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
97 if (*walk == clip_vcc) {
98 int error;
99
100 *walk = clip_vcc->next; /* atomic */
101 clip_vcc->entry = NULL;
102 if (clip_vcc->xoff)
103 netif_wake_queue(entry->neigh->dev);
104 if (entry->vccs)
105 goto out;
106 entry->expires = jiffies - 1;
107 /* force resolution or expiration */
108 error = neigh_update(entry->neigh, NULL, NUD_NONE,
109 NEIGH_UPDATE_F_ADMIN, 0);
110 if (error)
111 pr_crit("neigh_update failed with %d\n", error);
112 goto out;
113 }
114 pr_crit("ATMARP: failed (entry %p, vcc 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 = neighbour_priv(n);
123 struct clip_vcc *cv;
124
125 if (n->ops != &clip_neigh_ops)
126 return 0;
127 for (cv = entry->vccs; cv; cv = cv->next) {
128 unsigned long exp = cv->last_use + cv->idle_timeout;
129
130 if (cv->idle_timeout && time_after(jiffies, exp)) {
131 pr_debug("releasing vcc %p->%p of entry %p\n",
132 cv, cv->vcc, entry);
133 vcc_release_async(cv->vcc, -ETIMEDOUT);
134 }
135 }
136
137 if (entry->vccs || time_before(jiffies, entry->expires))
138 return 0;
139
140 if (refcount_read(&n->refcnt) > 1) {
141 struct sk_buff *skb;
142
143 pr_debug("destruction postponed with ref %d\n",
144 refcount_read(&n->refcnt));
145
146 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
147 dev_kfree_skb(skb);
148
149 return 0;
150 }
151
152 pr_debug("expired neigh %p\n", n);
153 return 1;
154 }
155
156 static void idle_timer_check(struct timer_list *unused)
157 {
158 write_lock(&arp_tbl.lock);
159 __neigh_for_each_release(&arp_tbl, neigh_check_cb);
160 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
161 write_unlock(&arp_tbl.lock);
162 }
163
164 static int clip_arp_rcv(struct sk_buff *skb)
165 {
166 struct atm_vcc *vcc;
167
168 pr_debug("\n");
169 vcc = ATM_SKB(skb)->vcc;
170 if (!vcc || !atm_charge(vcc, skb->truesize)) {
171 dev_kfree_skb_any(skb);
172 return 0;
173 }
174 pr_debug("pushing to %p\n", vcc);
175 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
176 CLIP_VCC(vcc)->old_push(vcc, skb);
177 return 0;
178 }
179
180 static const unsigned char llc_oui[] = {
181 0xaa, /* DSAP: non-ISO */
182 0xaa, /* SSAP: non-ISO */
183 0x03, /* Ctrl: Unnumbered Information Command PDU */
184 0x00, /* OUI: EtherType */
185 0x00,
186 0x00
187 };
188
189 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
190 {
191 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
192
193 pr_debug("\n");
194
195 if (!clip_devs) {
196 atm_return(vcc, skb->truesize);
197 kfree_skb(skb);
198 return;
199 }
200
201 if (!skb) {
202 pr_debug("removing VCC %p\n", clip_vcc);
203 if (clip_vcc->entry)
204 unlink_clip_vcc(clip_vcc);
205 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
206 kfree(clip_vcc);
207 return;
208 }
209 atm_return(vcc, skb->truesize);
210 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
211 /* clip_vcc->entry == NULL if we don't have an IP address yet */
212 if (!skb->dev) {
213 dev_kfree_skb_any(skb);
214 return;
215 }
216 ATM_SKB(skb)->vcc = vcc;
217 skb_reset_mac_header(skb);
218 if (!clip_vcc->encap ||
219 skb->len < RFC1483LLC_LEN ||
220 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
221 skb->protocol = htons(ETH_P_IP);
222 else {
223 skb->protocol = ((__be16 *)skb->data)[3];
224 skb_pull(skb, RFC1483LLC_LEN);
225 if (skb->protocol == htons(ETH_P_ARP)) {
226 skb->dev->stats.rx_packets++;
227 skb->dev->stats.rx_bytes += skb->len;
228 clip_arp_rcv(skb);
229 return;
230 }
231 }
232 clip_vcc->last_use = jiffies;
233 skb->dev->stats.rx_packets++;
234 skb->dev->stats.rx_bytes += skb->len;
235 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
236 netif_rx(skb);
237 }
238
239 /*
240 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
241 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
242 */
243
244 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
245 {
246 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
247 struct net_device *dev = skb->dev;
248 int old;
249 unsigned long flags;
250
251 pr_debug("(vcc %p)\n", vcc);
252 clip_vcc->old_pop(vcc, skb);
253 /* skb->dev == NULL in outbound ARP packets */
254 if (!dev)
255 return;
256 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
257 if (atm_may_send(vcc, 0)) {
258 old = xchg(&clip_vcc->xoff, 0);
259 if (old)
260 netif_wake_queue(dev);
261 }
262 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
263 }
264
265 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
266 {
267 __be32 *ip = (__be32 *) neigh->primary_key;
268
269 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
270 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
271 }
272
273 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
274 {
275 #ifndef CONFIG_ATM_CLIP_NO_ICMP
276 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
277 #endif
278 kfree_skb(skb);
279 }
280
281 static const struct neigh_ops clip_neigh_ops = {
282 .family = AF_INET,
283 .solicit = clip_neigh_solicit,
284 .error_report = clip_neigh_error,
285 .output = neigh_direct_output,
286 .connected_output = neigh_direct_output,
287 };
288
289 static int clip_constructor(struct net_device *dev, struct neighbour *neigh)
290 {
291 struct atmarp_entry *entry = neighbour_priv(neigh);
292
293 if (neigh->tbl->family != AF_INET)
294 return -EINVAL;
295
296 if (neigh->type != RTN_UNICAST)
297 return -EINVAL;
298
299 neigh->nud_state = NUD_NONE;
300 neigh->ops = &clip_neigh_ops;
301 neigh->output = neigh->ops->output;
302 entry->neigh = neigh;
303 entry->vccs = NULL;
304 entry->expires = jiffies - 1;
305
306 return 0;
307 }
308
309 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
310
311 /*
312 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
313 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
314 * don't increment the usage count. This is used to create entries in
315 * clip_setentry.
316 */
317
318 static int clip_encap(struct atm_vcc *vcc, int mode)
319 {
320 if (!CLIP_VCC(vcc))
321 return -EBADFD;
322
323 CLIP_VCC(vcc)->encap = mode;
324 return 0;
325 }
326
327 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
328 struct net_device *dev)
329 {
330 struct clip_priv *clip_priv = PRIV(dev);
331 struct dst_entry *dst = skb_dst(skb);
332 struct atmarp_entry *entry;
333 struct neighbour *n;
334 struct atm_vcc *vcc;
335 struct rtable *rt;
336 __be32 *daddr;
337 int old;
338 unsigned long flags;
339
340 pr_debug("(skb %p)\n", skb);
341 if (!dst) {
342 pr_err("skb_dst(skb) == NULL\n");
343 dev_kfree_skb(skb);
344 dev->stats.tx_dropped++;
345 return NETDEV_TX_OK;
346 }
347 rt = (struct rtable *) dst;
348 if (rt->rt_gateway)
349 daddr = &rt->rt_gateway;
350 else
351 daddr = &ip_hdr(skb)->daddr;
352 n = dst_neigh_lookup(dst, daddr);
353 if (!n) {
354 pr_err("NO NEIGHBOUR !\n");
355 dev_kfree_skb(skb);
356 dev->stats.tx_dropped++;
357 return NETDEV_TX_OK;
358 }
359 entry = neighbour_priv(n);
360 if (!entry->vccs) {
361 if (time_after(jiffies, entry->expires)) {
362 /* should be resolved */
363 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
364 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
365 }
366 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
367 skb_queue_tail(&entry->neigh->arp_queue, skb);
368 else {
369 dev_kfree_skb(skb);
370 dev->stats.tx_dropped++;
371 }
372 goto out_release_neigh;
373 }
374 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
375 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
376 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
377 if (entry->vccs->encap) {
378 void *here;
379
380 here = skb_push(skb, RFC1483LLC_LEN);
381 memcpy(here, llc_oui, sizeof(llc_oui));
382 ((__be16 *) here)[3] = skb->protocol;
383 }
384 atm_account_tx(vcc, skb);
385 entry->vccs->last_use = jiffies;
386 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
387 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
388 if (old) {
389 pr_warn("XOFF->XOFF transition\n");
390 goto out_release_neigh;
391 }
392 dev->stats.tx_packets++;
393 dev->stats.tx_bytes += skb->len;
394 vcc->send(vcc, skb);
395 if (atm_may_send(vcc, 0)) {
396 entry->vccs->xoff = 0;
397 goto out_release_neigh;
398 }
399 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
400 netif_stop_queue(dev); /* XOFF -> throttle immediately */
401 barrier();
402 if (!entry->vccs->xoff)
403 netif_start_queue(dev);
404 /* Oh, we just raced with clip_pop. netif_start_queue should be
405 good enough, because nothing should really be asleep because
406 of the brief netif_stop_queue. If this isn't true or if it
407 changes, use netif_wake_queue instead. */
408 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
409 out_release_neigh:
410 neigh_release(n);
411 return NETDEV_TX_OK;
412 }
413
414 static int clip_mkip(struct atm_vcc *vcc, int timeout)
415 {
416 struct clip_vcc *clip_vcc;
417
418 if (!vcc->push)
419 return -EBADFD;
420 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
421 if (!clip_vcc)
422 return -ENOMEM;
423 pr_debug("%p vcc %p\n", clip_vcc, vcc);
424 clip_vcc->vcc = vcc;
425 vcc->user_back = clip_vcc;
426 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
427 clip_vcc->entry = NULL;
428 clip_vcc->xoff = 0;
429 clip_vcc->encap = 1;
430 clip_vcc->last_use = jiffies;
431 clip_vcc->idle_timeout = timeout * HZ;
432 clip_vcc->old_push = vcc->push;
433 clip_vcc->old_pop = vcc->pop;
434 vcc->push = clip_push;
435 vcc->pop = clip_pop;
436
437 /* re-process everything received between connection setup and MKIP */
438 vcc_process_recv_queue(vcc);
439
440 return 0;
441 }
442
443 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
444 {
445 struct neighbour *neigh;
446 struct atmarp_entry *entry;
447 int error;
448 struct clip_vcc *clip_vcc;
449 struct rtable *rt;
450
451 if (vcc->push != clip_push) {
452 pr_warn("non-CLIP VCC\n");
453 return -EBADF;
454 }
455 clip_vcc = CLIP_VCC(vcc);
456 if (!ip) {
457 if (!clip_vcc->entry) {
458 pr_err("hiding hidden ATMARP entry\n");
459 return 0;
460 }
461 pr_debug("remove\n");
462 unlink_clip_vcc(clip_vcc);
463 return 0;
464 }
465 rt = ip_route_output(&init_net, ip, 0, 1, 0);
466 if (IS_ERR(rt))
467 return PTR_ERR(rt);
468 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
469 ip_rt_put(rt);
470 if (!neigh)
471 return -ENOMEM;
472 entry = neighbour_priv(neigh);
473 if (entry != clip_vcc->entry) {
474 if (!clip_vcc->entry)
475 pr_debug("add\n");
476 else {
477 pr_debug("update\n");
478 unlink_clip_vcc(clip_vcc);
479 }
480 link_vcc(clip_vcc, entry);
481 }
482 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
483 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, 0);
484 neigh_release(neigh);
485 return error;
486 }
487
488 static const struct net_device_ops clip_netdev_ops = {
489 .ndo_start_xmit = clip_start_xmit,
490 .ndo_neigh_construct = clip_constructor,
491 };
492
493 static void clip_setup(struct net_device *dev)
494 {
495 dev->netdev_ops = &clip_netdev_ops;
496 dev->type = ARPHRD_ATM;
497 dev->neigh_priv_len = sizeof(struct atmarp_entry);
498 dev->hard_header_len = RFC1483LLC_LEN;
499 dev->mtu = RFC1626_MTU;
500 dev->tx_queue_len = 100; /* "normal" queue (packets) */
501 /* When using a "real" qdisc, the qdisc determines the queue */
502 /* length. tx_queue_len is only used for the default case, */
503 /* without any more elaborate queuing. 100 is a reasonable */
504 /* compromise between decent burst-tolerance and protection */
505 /* against memory hogs. */
506 netif_keep_dst(dev);
507 }
508
509 static int clip_create(int number)
510 {
511 struct net_device *dev;
512 struct clip_priv *clip_priv;
513 int error;
514
515 if (number != -1) {
516 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
517 if (PRIV(dev)->number == number)
518 return -EEXIST;
519 } else {
520 number = 0;
521 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
522 if (PRIV(dev)->number >= number)
523 number = PRIV(dev)->number + 1;
524 }
525 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN,
526 clip_setup);
527 if (!dev)
528 return -ENOMEM;
529 clip_priv = PRIV(dev);
530 sprintf(dev->name, "atm%d", number);
531 spin_lock_init(&clip_priv->xoff_lock);
532 clip_priv->number = number;
533 error = register_netdev(dev);
534 if (error) {
535 free_netdev(dev);
536 return error;
537 }
538 clip_priv->next = clip_devs;
539 clip_devs = dev;
540 pr_debug("registered (net:%s)\n", dev->name);
541 return number;
542 }
543
544 static int clip_device_event(struct notifier_block *this, unsigned long event,
545 void *ptr)
546 {
547 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
548
549 if (!net_eq(dev_net(dev), &init_net))
550 return NOTIFY_DONE;
551
552 if (event == NETDEV_UNREGISTER)
553 return NOTIFY_DONE;
554
555 /* ignore non-CLIP devices */
556 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
557 return NOTIFY_DONE;
558
559 switch (event) {
560 case NETDEV_UP:
561 pr_debug("NETDEV_UP\n");
562 to_atmarpd(act_up, PRIV(dev)->number, 0);
563 break;
564 case NETDEV_GOING_DOWN:
565 pr_debug("NETDEV_DOWN\n");
566 to_atmarpd(act_down, PRIV(dev)->number, 0);
567 break;
568 case NETDEV_CHANGE:
569 case NETDEV_CHANGEMTU:
570 pr_debug("NETDEV_CHANGE*\n");
571 to_atmarpd(act_change, PRIV(dev)->number, 0);
572 break;
573 }
574 return NOTIFY_DONE;
575 }
576
577 static int clip_inet_event(struct notifier_block *this, unsigned long event,
578 void *ifa)
579 {
580 struct in_device *in_dev;
581 struct netdev_notifier_info info;
582
583 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
584 /*
585 * Transitions are of the down-change-up type, so it's sufficient to
586 * handle the change on up.
587 */
588 if (event != NETDEV_UP)
589 return NOTIFY_DONE;
590 netdev_notifier_info_init(&info, in_dev->dev);
591 return clip_device_event(this, NETDEV_CHANGE, &info);
592 }
593
594 static struct notifier_block clip_dev_notifier = {
595 .notifier_call = clip_device_event,
596 };
597
598
599
600 static struct notifier_block clip_inet_notifier = {
601 .notifier_call = clip_inet_event,
602 };
603
604
605
606 static void atmarpd_close(struct atm_vcc *vcc)
607 {
608 pr_debug("\n");
609
610 rtnl_lock();
611 atmarpd = NULL;
612 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
613 rtnl_unlock();
614
615 pr_debug("(done)\n");
616 module_put(THIS_MODULE);
617 }
618
619 static const struct atmdev_ops atmarpd_dev_ops = {
620 .close = atmarpd_close
621 };
622
623
624 static struct atm_dev atmarpd_dev = {
625 .ops = &atmarpd_dev_ops,
626 .type = "arpd",
627 .number = 999,
628 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
629 };
630
631
632 static int atm_init_atmarp(struct atm_vcc *vcc)
633 {
634 rtnl_lock();
635 if (atmarpd) {
636 rtnl_unlock();
637 return -EADDRINUSE;
638 }
639
640 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
641
642 atmarpd = vcc;
643 set_bit(ATM_VF_META, &vcc->flags);
644 set_bit(ATM_VF_READY, &vcc->flags);
645 /* allow replies and avoid getting closed if signaling dies */
646 vcc->dev = &atmarpd_dev;
647 vcc_insert_socket(sk_atm(vcc));
648 vcc->push = NULL;
649 vcc->pop = NULL; /* crash */
650 vcc->push_oam = NULL; /* crash */
651 rtnl_unlock();
652 return 0;
653 }
654
655 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
656 {
657 struct atm_vcc *vcc = ATM_SD(sock);
658 int err = 0;
659
660 switch (cmd) {
661 case SIOCMKCLIP:
662 case ATMARPD_CTRL:
663 case ATMARP_MKIP:
664 case ATMARP_SETENTRY:
665 case ATMARP_ENCAP:
666 if (!capable(CAP_NET_ADMIN))
667 return -EPERM;
668 break;
669 default:
670 return -ENOIOCTLCMD;
671 }
672
673 switch (cmd) {
674 case SIOCMKCLIP:
675 err = clip_create(arg);
676 break;
677 case ATMARPD_CTRL:
678 err = atm_init_atmarp(vcc);
679 if (!err) {
680 sock->state = SS_CONNECTED;
681 __module_get(THIS_MODULE);
682 }
683 break;
684 case ATMARP_MKIP:
685 err = clip_mkip(vcc, arg);
686 break;
687 case ATMARP_SETENTRY:
688 err = clip_setentry(vcc, (__force __be32)arg);
689 break;
690 case ATMARP_ENCAP:
691 err = clip_encap(vcc, arg);
692 break;
693 }
694 return err;
695 }
696
697 static struct atm_ioctl clip_ioctl_ops = {
698 .owner = THIS_MODULE,
699 .ioctl = clip_ioctl,
700 };
701
702 #ifdef CONFIG_PROC_FS
703
704 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
705 {
706 static int code[] = { 1, 2, 10, 6, 1, 0 };
707 static int e164[] = { 1, 8, 4, 6, 1, 0 };
708
709 if (*addr->sas_addr.pub) {
710 seq_printf(seq, "%s", addr->sas_addr.pub);
711 if (*addr->sas_addr.prv)
712 seq_putc(seq, '+');
713 } else if (!*addr->sas_addr.prv) {
714 seq_printf(seq, "%s", "(none)");
715 return;
716 }
717 if (*addr->sas_addr.prv) {
718 unsigned char *prv = addr->sas_addr.prv;
719 int *fields;
720 int i, j;
721
722 fields = *prv == ATM_AFI_E164 ? e164 : code;
723 for (i = 0; fields[i]; i++) {
724 for (j = fields[i]; j; j--)
725 seq_printf(seq, "%02X", *prv++);
726 if (fields[i + 1])
727 seq_putc(seq, '.');
728 }
729 }
730 }
731
732 /* This means the neighbour entry has no attached VCC objects. */
733 #define SEQ_NO_VCC_TOKEN ((void *) 2)
734
735 static void atmarp_info(struct seq_file *seq, struct neighbour *n,
736 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
737 {
738 struct net_device *dev = n->dev;
739 unsigned long exp;
740 char buf[17];
741 int svc, llc, off;
742
743 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
744 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
745
746 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
747
748 if (clip_vcc == SEQ_NO_VCC_TOKEN)
749 exp = entry->neigh->used;
750 else
751 exp = clip_vcc->last_use;
752
753 exp = (jiffies - exp) / HZ;
754
755 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
756 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
757
758 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
759 while (off < 16)
760 buf[off++] = ' ';
761 buf[off] = '\0';
762 seq_printf(seq, "%s", buf);
763
764 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
765 if (time_before(jiffies, entry->expires))
766 seq_printf(seq, "(resolving)\n");
767 else
768 seq_printf(seq, "(expired, ref %d)\n",
769 refcount_read(&entry->neigh->refcnt));
770 } else if (!svc) {
771 seq_printf(seq, "%d.%d.%d\n",
772 clip_vcc->vcc->dev->number,
773 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
774 } else {
775 svc_addr(seq, &clip_vcc->vcc->remote);
776 seq_putc(seq, '\n');
777 }
778 }
779
780 struct clip_seq_state {
781 /* This member must be first. */
782 struct neigh_seq_state ns;
783
784 /* Local to clip specific iteration. */
785 struct clip_vcc *vcc;
786 };
787
788 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
789 struct clip_vcc *curr)
790 {
791 if (!curr) {
792 curr = e->vccs;
793 if (!curr)
794 return SEQ_NO_VCC_TOKEN;
795 return curr;
796 }
797 if (curr == SEQ_NO_VCC_TOKEN)
798 return NULL;
799
800 curr = curr->next;
801
802 return curr;
803 }
804
805 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
806 struct atmarp_entry *e, loff_t * pos)
807 {
808 struct clip_vcc *vcc = state->vcc;
809
810 vcc = clip_seq_next_vcc(e, vcc);
811 if (vcc && pos != NULL) {
812 while (*pos) {
813 vcc = clip_seq_next_vcc(e, vcc);
814 if (!vcc)
815 break;
816 --(*pos);
817 }
818 }
819 state->vcc = vcc;
820
821 return vcc;
822 }
823
824 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
825 struct neighbour *n, loff_t * pos)
826 {
827 struct clip_seq_state *state = (struct clip_seq_state *)_state;
828
829 if (n->dev->type != ARPHRD_ATM)
830 return NULL;
831
832 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
833 }
834
835 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
836 {
837 struct clip_seq_state *state = seq->private;
838 state->ns.neigh_sub_iter = clip_seq_sub_iter;
839 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
840 }
841
842 static int clip_seq_show(struct seq_file *seq, void *v)
843 {
844 static char atm_arp_banner[] =
845 "IPitf TypeEncp Idle IP address ATM address\n";
846
847 if (v == SEQ_START_TOKEN) {
848 seq_puts(seq, atm_arp_banner);
849 } else {
850 struct clip_seq_state *state = seq->private;
851 struct clip_vcc *vcc = state->vcc;
852 struct neighbour *n = v;
853
854 atmarp_info(seq, n, neighbour_priv(n), vcc);
855 }
856 return 0;
857 }
858
859 static const struct seq_operations arp_seq_ops = {
860 .start = clip_seq_start,
861 .next = neigh_seq_next,
862 .stop = neigh_seq_stop,
863 .show = clip_seq_show,
864 };
865 #endif
866
867 static void atm_clip_exit_noproc(void);
868
869 static int __init atm_clip_init(void)
870 {
871 register_atm_ioctl(&clip_ioctl_ops);
872 register_netdevice_notifier(&clip_dev_notifier);
873 register_inetaddr_notifier(&clip_inet_notifier);
874
875 timer_setup(&idle_timer, idle_timer_check, 0);
876
877 #ifdef CONFIG_PROC_FS
878 {
879 struct proc_dir_entry *p;
880
881 p = proc_create_net("arp", 0444, atm_proc_root, &arp_seq_ops,
882 sizeof(struct clip_seq_state));
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");
Linux with added FPC-III support