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Linux 4.1.18
[linux/fpc-iii.git] / net / atm / clip.c
blob17e55dfecbe2a133a2a0e02d363b583a0334aecc
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 = (struct atmarp_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);
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 (atomic_read(&n->refcnt) > 1) {
141 struct sk_buff *skb;
142
143 pr_debug("destruction postponed with ref %d\n",
144 atomic_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(unsigned long dummy)
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 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 CLIP_VCC(vcc)->encap = mode;
321 return 0;
322 }
323
324 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
325 struct net_device *dev)
326 {
327 struct clip_priv *clip_priv = PRIV(dev);
328 struct dst_entry *dst = skb_dst(skb);
329 struct atmarp_entry *entry;
330 struct neighbour *n;
331 struct atm_vcc *vcc;
332 struct rtable *rt;
333 __be32 *daddr;
334 int old;
335 unsigned long flags;
336
337 pr_debug("(skb %p)\n", skb);
338 if (!dst) {
339 pr_err("skb_dst(skb) == NULL\n");
340 dev_kfree_skb(skb);
341 dev->stats.tx_dropped++;
342 return NETDEV_TX_OK;
343 }
344 rt = (struct rtable *) dst;
345 if (rt->rt_gateway)
346 daddr = &rt->rt_gateway;
347 else
348 daddr = &ip_hdr(skb)->daddr;
349 n = dst_neigh_lookup(dst, daddr);
350 if (!n) {
351 pr_err("NO NEIGHBOUR !\n");
352 dev_kfree_skb(skb);
353 dev->stats.tx_dropped++;
354 return NETDEV_TX_OK;
355 }
356 entry = neighbour_priv(n);
357 if (!entry->vccs) {
358 if (time_after(jiffies, entry->expires)) {
359 /* should be resolved */
360 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
361 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
362 }
363 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
364 skb_queue_tail(&entry->neigh->arp_queue, skb);
365 else {
366 dev_kfree_skb(skb);
367 dev->stats.tx_dropped++;
368 }
369 goto out_release_neigh;
370 }
371 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
372 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
373 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
374 if (entry->vccs->encap) {
375 void *here;
376
377 here = skb_push(skb, RFC1483LLC_LEN);
378 memcpy(here, llc_oui, sizeof(llc_oui));
379 ((__be16 *) here)[3] = skb->protocol;
380 }
381 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
382 ATM_SKB(skb)->atm_options = vcc->atm_options;
383 entry->vccs->last_use = jiffies;
384 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
385 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
386 if (old) {
387 pr_warn("XOFF->XOFF transition\n");
388 goto out_release_neigh;
389 }
390 dev->stats.tx_packets++;
391 dev->stats.tx_bytes += skb->len;
392 vcc->send(vcc, skb);
393 if (atm_may_send(vcc, 0)) {
394 entry->vccs->xoff = 0;
395 goto out_release_neigh;
396 }
397 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
398 netif_stop_queue(dev); /* XOFF -> throttle immediately */
399 barrier();
400 if (!entry->vccs->xoff)
401 netif_start_queue(dev);
402 /* Oh, we just raced with clip_pop. netif_start_queue should be
403 good enough, because nothing should really be asleep because
404 of the brief netif_stop_queue. If this isn't true or if it
405 changes, use netif_wake_queue instead. */
406 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
407 out_release_neigh:
408 neigh_release(n);
409 return NETDEV_TX_OK;
410 }
411
412 static int clip_mkip(struct atm_vcc *vcc, int timeout)
413 {
414 struct clip_vcc *clip_vcc;
415
416 if (!vcc->push)
417 return -EBADFD;
418 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
419 if (!clip_vcc)
420 return -ENOMEM;
421 pr_debug("%p vcc %p\n", clip_vcc, vcc);
422 clip_vcc->vcc = vcc;
423 vcc->user_back = clip_vcc;
424 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
425 clip_vcc->entry = NULL;
426 clip_vcc->xoff = 0;
427 clip_vcc->encap = 1;
428 clip_vcc->last_use = jiffies;
429 clip_vcc->idle_timeout = timeout * HZ;
430 clip_vcc->old_push = vcc->push;
431 clip_vcc->old_pop = vcc->pop;
432 vcc->push = clip_push;
433 vcc->pop = clip_pop;
434
435 /* re-process everything received between connection setup and MKIP */
436 vcc_process_recv_queue(vcc);
437
438 return 0;
439 }
440
441 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
442 {
443 struct neighbour *neigh;
444 struct atmarp_entry *entry;
445 int error;
446 struct clip_vcc *clip_vcc;
447 struct rtable *rt;
448
449 if (vcc->push != clip_push) {
450 pr_warn("non-CLIP VCC\n");
451 return -EBADF;
452 }
453 clip_vcc = CLIP_VCC(vcc);
454 if (!ip) {
455 if (!clip_vcc->entry) {
456 pr_err("hiding hidden ATMARP entry\n");
457 return 0;
458 }
459 pr_debug("remove\n");
460 unlink_clip_vcc(clip_vcc);
461 return 0;
462 }
463 rt = ip_route_output(&init_net, ip, 0, 1, 0);
464 if (IS_ERR(rt))
465 return PTR_ERR(rt);
466 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
467 ip_rt_put(rt);
468 if (!neigh)
469 return -ENOMEM;
470 entry = neighbour_priv(neigh);
471 if (entry != clip_vcc->entry) {
472 if (!clip_vcc->entry)
473 pr_debug("add\n");
474 else {
475 pr_debug("update\n");
476 unlink_clip_vcc(clip_vcc);
477 }
478 link_vcc(clip_vcc, entry);
479 }
480 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
481 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
482 neigh_release(neigh);
483 return error;
484 }
485
486 static const struct net_device_ops clip_netdev_ops = {
487 .ndo_start_xmit = clip_start_xmit,
488 .ndo_neigh_construct = clip_constructor,
489 };
490
491 static void clip_setup(struct net_device *dev)
492 {
493 dev->netdev_ops = &clip_netdev_ops;
494 dev->type = ARPHRD_ATM;
495 dev->neigh_priv_len = sizeof(struct atmarp_entry);
496 dev->hard_header_len = RFC1483LLC_LEN;
497 dev->mtu = RFC1626_MTU;
498 dev->tx_queue_len = 100; /* "normal" queue (packets) */
499 /* When using a "real" qdisc, the qdisc determines the queue */
500 /* length. tx_queue_len is only used for the default case, */
501 /* without any more elaborate queuing. 100 is a reasonable */
502 /* compromise between decent burst-tolerance and protection */
503 /* against memory hogs. */
504 netif_keep_dst(dev);
505 }
506
507 static int clip_create(int number)
508 {
509 struct net_device *dev;
510 struct clip_priv *clip_priv;
511 int error;
512
513 if (number != -1) {
514 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
515 if (PRIV(dev)->number == number)
516 return -EEXIST;
517 } else {
518 number = 0;
519 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
520 if (PRIV(dev)->number >= number)
521 number = PRIV(dev)->number + 1;
522 }
523 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN,
524 clip_setup);
525 if (!dev)
526 return -ENOMEM;
527 clip_priv = PRIV(dev);
528 sprintf(dev->name, "atm%d", number);
529 spin_lock_init(&clip_priv->xoff_lock);
530 clip_priv->number = number;
531 error = register_netdev(dev);
532 if (error) {
533 free_netdev(dev);
534 return error;
535 }
536 clip_priv->next = clip_devs;
537 clip_devs = dev;
538 pr_debug("registered (net:%s)\n", dev->name);
539 return number;
540 }
541
542 static int clip_device_event(struct notifier_block *this, unsigned long event,
543 void *ptr)
544 {
545 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
546
547 if (!net_eq(dev_net(dev), &init_net))
548 return NOTIFY_DONE;
549
550 if (event == NETDEV_UNREGISTER)
551 return NOTIFY_DONE;
552
553 /* ignore non-CLIP devices */
554 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
555 return NOTIFY_DONE;
556
557 switch (event) {
558 case NETDEV_UP:
559 pr_debug("NETDEV_UP\n");
560 to_atmarpd(act_up, PRIV(dev)->number, 0);
561 break;
562 case NETDEV_GOING_DOWN:
563 pr_debug("NETDEV_DOWN\n");
564 to_atmarpd(act_down, PRIV(dev)->number, 0);
565 break;
566 case NETDEV_CHANGE:
567 case NETDEV_CHANGEMTU:
568 pr_debug("NETDEV_CHANGE*\n");
569 to_atmarpd(act_change, PRIV(dev)->number, 0);
570 break;
571 }
572 return NOTIFY_DONE;
573 }
574
575 static int clip_inet_event(struct notifier_block *this, unsigned long event,
576 void *ifa)
577 {
578 struct in_device *in_dev;
579 struct netdev_notifier_info info;
580
581 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
582 /*
583 * Transitions are of the down-change-up type, so it's sufficient to
584 * handle the change on up.
585 */
586 if (event != NETDEV_UP)
587 return NOTIFY_DONE;
588 netdev_notifier_info_init(&info, in_dev->dev);
589 return clip_device_event(this, NETDEV_CHANGE, &info);
590 }
591
592 static struct notifier_block clip_dev_notifier = {
593 .notifier_call = clip_device_event,
594 };
595
596
597
598 static struct notifier_block clip_inet_notifier = {
599 .notifier_call = clip_inet_event,
600 };
601
602
603
604 static void atmarpd_close(struct atm_vcc *vcc)
605 {
606 pr_debug("\n");
607
608 rtnl_lock();
609 atmarpd = NULL;
610 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
611 rtnl_unlock();
612
613 pr_debug("(done)\n");
614 module_put(THIS_MODULE);
615 }
616
617 static struct atmdev_ops atmarpd_dev_ops = {
618 .close = atmarpd_close
619 };
620
621
622 static struct atm_dev atmarpd_dev = {
623 .ops = &atmarpd_dev_ops,
624 .type = "arpd",
625 .number = 999,
626 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
627 };
628
629
630 static int atm_init_atmarp(struct atm_vcc *vcc)
631 {
632 rtnl_lock();
633 if (atmarpd) {
634 rtnl_unlock();
635 return -EADDRINUSE;
636 }
637
638 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
639
640 atmarpd = vcc;
641 set_bit(ATM_VF_META, &vcc->flags);
642 set_bit(ATM_VF_READY, &vcc->flags);
643 /* allow replies and avoid getting closed if signaling dies */
644 vcc->dev = &atmarpd_dev;
645 vcc_insert_socket(sk_atm(vcc));
646 vcc->push = NULL;
647 vcc->pop = NULL; /* crash */
648 vcc->push_oam = NULL; /* crash */
649 rtnl_unlock();
650 return 0;
651 }
652
653 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
654 {
655 struct atm_vcc *vcc = ATM_SD(sock);
656 int err = 0;
657
658 switch (cmd) {
659 case SIOCMKCLIP:
660 case ATMARPD_CTRL:
661 case ATMARP_MKIP:
662 case ATMARP_SETENTRY:
663 case ATMARP_ENCAP:
664 if (!capable(CAP_NET_ADMIN))
665 return -EPERM;
666 break;
667 default:
668 return -ENOIOCTLCMD;
669 }
670
671 switch (cmd) {
672 case SIOCMKCLIP:
673 err = clip_create(arg);
674 break;
675 case ATMARPD_CTRL:
676 err = atm_init_atmarp(vcc);
677 if (!err) {
678 sock->state = SS_CONNECTED;
679 __module_get(THIS_MODULE);
680 }
681 break;
682 case ATMARP_MKIP:
683 err = clip_mkip(vcc, arg);
684 break;
685 case ATMARP_SETENTRY:
686 err = clip_setentry(vcc, (__force __be32)arg);
687 break;
688 case ATMARP_ENCAP:
689 err = clip_encap(vcc, arg);
690 break;
691 }
692 return err;
693 }
694
695 static struct atm_ioctl clip_ioctl_ops = {
696 .owner = THIS_MODULE,
697 .ioctl = clip_ioctl,
698 };
699
700 #ifdef CONFIG_PROC_FS
701
702 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
703 {
704 static int code[] = { 1, 2, 10, 6, 1, 0 };
705 static int e164[] = { 1, 8, 4, 6, 1, 0 };
706
707 if (*addr->sas_addr.pub) {
708 seq_printf(seq, "%s", addr->sas_addr.pub);
709 if (*addr->sas_addr.prv)
710 seq_putc(seq, '+');
711 } else if (!*addr->sas_addr.prv) {
712 seq_printf(seq, "%s", "(none)");
713 return;
714 }
715 if (*addr->sas_addr.prv) {
716 unsigned char *prv = addr->sas_addr.prv;
717 int *fields;
718 int i, j;
719
720 fields = *prv == ATM_AFI_E164 ? e164 : code;
721 for (i = 0; fields[i]; i++) {
722 for (j = fields[i]; j; j--)
723 seq_printf(seq, "%02X", *prv++);
724 if (fields[i + 1])
725 seq_putc(seq, '.');
726 }
727 }
728 }
729
730 /* This means the neighbour entry has no attached VCC objects. */
731 #define SEQ_NO_VCC_TOKEN ((void *) 2)
732
733 static void atmarp_info(struct seq_file *seq, struct neighbour *n,
734 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
735 {
736 struct net_device *dev = n->dev;
737 unsigned long exp;
738 char buf[17];
739 int svc, llc, off;
740
741 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
742 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
743
744 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
745
746 if (clip_vcc == SEQ_NO_VCC_TOKEN)
747 exp = entry->neigh->used;
748 else
749 exp = clip_vcc->last_use;
750
751 exp = (jiffies - exp) / HZ;
752
753 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
754 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
755
756 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
757 while (off < 16)
758 buf[off++] = ' ';
759 buf[off] = '\0';
760 seq_printf(seq, "%s", buf);
761
762 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
763 if (time_before(jiffies, entry->expires))
764 seq_printf(seq, "(resolving)\n");
765 else
766 seq_printf(seq, "(expired, ref %d)\n",
767 atomic_read(&entry->neigh->refcnt));
768 } else if (!svc) {
769 seq_printf(seq, "%d.%d.%d\n",
770 clip_vcc->vcc->dev->number,
771 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
772 } else {
773 svc_addr(seq, &clip_vcc->vcc->remote);
774 seq_putc(seq, '\n');
775 }
776 }
777
778 struct clip_seq_state {
779 /* This member must be first. */
780 struct neigh_seq_state ns;
781
782 /* Local to clip specific iteration. */
783 struct clip_vcc *vcc;
784 };
785
786 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
787 struct clip_vcc *curr)
788 {
789 if (!curr) {
790 curr = e->vccs;
791 if (!curr)
792 return SEQ_NO_VCC_TOKEN;
793 return curr;
794 }
795 if (curr == SEQ_NO_VCC_TOKEN)
796 return NULL;
797
798 curr = curr->next;
799
800 return curr;
801 }
802
803 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
804 struct atmarp_entry *e, loff_t * pos)
805 {
806 struct clip_vcc *vcc = state->vcc;
807
808 vcc = clip_seq_next_vcc(e, vcc);
809 if (vcc && pos != NULL) {
810 while (*pos) {
811 vcc = clip_seq_next_vcc(e, vcc);
812 if (!vcc)
813 break;
814 --(*pos);
815 }
816 }
817 state->vcc = vcc;
818
819 return vcc;
820 }
821
822 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
823 struct neighbour *n, loff_t * pos)
824 {
825 struct clip_seq_state *state = (struct clip_seq_state *)_state;
826
827 if (n->dev->type != ARPHRD_ATM)
828 return NULL;
829
830 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
831 }
832
833 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
834 {
835 struct clip_seq_state *state = seq->private;
836 state->ns.neigh_sub_iter = clip_seq_sub_iter;
837 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
838 }
839
840 static int clip_seq_show(struct seq_file *seq, void *v)
841 {
842 static char atm_arp_banner[] =
843 "IPitf TypeEncp Idle IP address ATM address\n";
844
845 if (v == SEQ_START_TOKEN) {
846 seq_puts(seq, atm_arp_banner);
847 } else {
848 struct clip_seq_state *state = seq->private;
849 struct clip_vcc *vcc = state->vcc;
850 struct neighbour *n = v;
851
852 atmarp_info(seq, n, neighbour_priv(n), vcc);
853 }
854 return 0;
855 }
856
857 static const struct seq_operations arp_seq_ops = {
858 .start = clip_seq_start,
859 .next = neigh_seq_next,
860 .stop = neigh_seq_stop,
861 .show = clip_seq_show,
862 };
863
864 static int arp_seq_open(struct inode *inode, struct file *file)
865 {
866 return seq_open_net(inode, file, &arp_seq_ops,
867 sizeof(struct clip_seq_state));
868 }
869
870 static const struct file_operations arp_seq_fops = {
871 .open = arp_seq_open,
872 .read = seq_read,
873 .llseek = seq_lseek,
874 .release = seq_release_net,
875 .owner = THIS_MODULE
876 };
877 #endif
878
879 static void atm_clip_exit_noproc(void);
880
881 static int __init atm_clip_init(void)
882 {
883 register_atm_ioctl(&clip_ioctl_ops);
884 register_netdevice_notifier(&clip_dev_notifier);
885 register_inetaddr_notifier(&clip_inet_notifier);
886
887 setup_timer(&idle_timer, idle_timer_check, 0);
888
889 #ifdef CONFIG_PROC_FS
890 {
891 struct proc_dir_entry *p;
892
893 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
894 if (!p) {
895 pr_err("Unable to initialize /proc/net/atm/arp\n");
896 atm_clip_exit_noproc();
897 return -ENOMEM;
898 }
899 }
900 #endif
901
902 return 0;
903 }
904
905 static void atm_clip_exit_noproc(void)
906 {
907 struct net_device *dev, *next;
908
909 unregister_inetaddr_notifier(&clip_inet_notifier);
910 unregister_netdevice_notifier(&clip_dev_notifier);
911
912 deregister_atm_ioctl(&clip_ioctl_ops);
913
914 /* First, stop the idle timer, so it stops banging
915 * on the table.
916 */
917 del_timer_sync(&idle_timer);
918
919 dev = clip_devs;
920 while (dev) {
921 next = PRIV(dev)->next;
922 unregister_netdev(dev);
923 free_netdev(dev);
924 dev = next;
925 }
926 }
927
928 static void __exit atm_clip_exit(void)
929 {
930 remove_proc_entry("arp", atm_proc_root);
931
932 atm_clip_exit_noproc();
933 }
934
935 module_init(atm_clip_init);
936 module_exit(atm_clip_exit);
937 MODULE_AUTHOR("Werner Almesberger");
938 MODULE_DESCRIPTION("Classical/IP over ATM interface");
939 MODULE_LICENSE("GPL");
Linux with added FPC-III support