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Linux 3.0.62
[linux/fpc-iii.git] / net / atm / clip.c
blob5889074e97183dc7a89c44a0e473a0533d894143
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 <linux/param.h> /* for HZ */
37 #include <linux/uaccess.h>
38 #include <asm/byteorder.h> /* for htons etc. */
39 #include <asm/system.h> /* save/restore_flags */
40 #include <asm/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 neigh_table clip_tbl;
49 static struct timer_list idle_timer;
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, skb->len);
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 = NEIGH2ENTRY(n);
123 struct clip_vcc *cv;
124
125 for (cv = entry->vccs; cv; cv = cv->next) {
126 unsigned long exp = cv->last_use + cv->idle_timeout;
127
128 if (cv->idle_timeout && time_after(jiffies, exp)) {
129 pr_debug("releasing vcc %p->%p of entry %p\n",
130 cv, cv->vcc, entry);
131 vcc_release_async(cv->vcc, -ETIMEDOUT);
132 }
133 }
134
135 if (entry->vccs || time_before(jiffies, entry->expires))
136 return 0;
137
138 if (atomic_read(&n->refcnt) > 1) {
139 struct sk_buff *skb;
140
141 pr_debug("destruction postponed with ref %d\n",
142 atomic_read(&n->refcnt));
143
144 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
145 dev_kfree_skb(skb);
146
147 return 0;
148 }
149
150 pr_debug("expired neigh %p\n", n);
151 return 1;
152 }
153
154 static void idle_timer_check(unsigned long dummy)
155 {
156 write_lock(&clip_tbl.lock);
157 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
158 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
159 write_unlock(&clip_tbl.lock);
160 }
161
162 static int clip_arp_rcv(struct sk_buff *skb)
163 {
164 struct atm_vcc *vcc;
165
166 pr_debug("\n");
167 vcc = ATM_SKB(skb)->vcc;
168 if (!vcc || !atm_charge(vcc, skb->truesize)) {
169 dev_kfree_skb_any(skb);
170 return 0;
171 }
172 pr_debug("pushing to %p\n", vcc);
173 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
174 CLIP_VCC(vcc)->old_push(vcc, skb);
175 return 0;
176 }
177
178 static const unsigned char llc_oui[] = {
179 0xaa, /* DSAP: non-ISO */
180 0xaa, /* SSAP: non-ISO */
181 0x03, /* Ctrl: Unnumbered Information Command PDU */
182 0x00, /* OUI: EtherType */
183 0x00,
184 0x00
185 };
186
187 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
188 {
189 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
190
191 pr_debug("\n");
192 if (!skb) {
193 pr_debug("removing VCC %p\n", clip_vcc);
194 if (clip_vcc->entry)
195 unlink_clip_vcc(clip_vcc);
196 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
197 kfree(clip_vcc);
198 return;
199 }
200 atm_return(vcc, skb->truesize);
201 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
202 /* clip_vcc->entry == NULL if we don't have an IP address yet */
203 if (!skb->dev) {
204 dev_kfree_skb_any(skb);
205 return;
206 }
207 ATM_SKB(skb)->vcc = vcc;
208 skb_reset_mac_header(skb);
209 if (!clip_vcc->encap ||
210 skb->len < RFC1483LLC_LEN ||
211 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
212 skb->protocol = htons(ETH_P_IP);
213 else {
214 skb->protocol = ((__be16 *)skb->data)[3];
215 skb_pull(skb, RFC1483LLC_LEN);
216 if (skb->protocol == htons(ETH_P_ARP)) {
217 skb->dev->stats.rx_packets++;
218 skb->dev->stats.rx_bytes += skb->len;
219 clip_arp_rcv(skb);
220 return;
221 }
222 }
223 clip_vcc->last_use = jiffies;
224 skb->dev->stats.rx_packets++;
225 skb->dev->stats.rx_bytes += skb->len;
226 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
227 netif_rx(skb);
228 }
229
230 /*
231 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
232 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
233 */
234
235 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
236 {
237 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
238 struct net_device *dev = skb->dev;
239 int old;
240 unsigned long flags;
241
242 pr_debug("(vcc %p)\n", vcc);
243 clip_vcc->old_pop(vcc, skb);
244 /* skb->dev == NULL in outbound ARP packets */
245 if (!dev)
246 return;
247 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
248 if (atm_may_send(vcc, 0)) {
249 old = xchg(&clip_vcc->xoff, 0);
250 if (old)
251 netif_wake_queue(dev);
252 }
253 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
254 }
255
256 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
257 {
258 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
259 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
260 }
261
262 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
263 {
264 #ifndef CONFIG_ATM_CLIP_NO_ICMP
265 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
266 #endif
267 kfree_skb(skb);
268 }
269
270 static const struct neigh_ops clip_neigh_ops = {
271 .family = AF_INET,
272 .solicit = clip_neigh_solicit,
273 .error_report = clip_neigh_error,
274 .output = dev_queue_xmit,
275 .connected_output = dev_queue_xmit,
276 .hh_output = dev_queue_xmit,
277 .queue_xmit = dev_queue_xmit,
278 };
279
280 static int clip_constructor(struct neighbour *neigh)
281 {
282 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
283 struct net_device *dev = neigh->dev;
284 struct in_device *in_dev;
285 struct neigh_parms *parms;
286
287 pr_debug("(neigh %p, entry %p)\n", neigh, entry);
288 neigh->type = inet_addr_type(&init_net, entry->ip);
289 if (neigh->type != RTN_UNICAST)
290 return -EINVAL;
291
292 rcu_read_lock();
293 in_dev = __in_dev_get_rcu(dev);
294 if (!in_dev) {
295 rcu_read_unlock();
296 return -EINVAL;
297 }
298
299 parms = in_dev->arp_parms;
300 __neigh_parms_put(neigh->parms);
301 neigh->parms = neigh_parms_clone(parms);
302 rcu_read_unlock();
303
304 neigh->ops = &clip_neigh_ops;
305 neigh->output = neigh->nud_state & NUD_VALID ?
306 neigh->ops->connected_output : neigh->ops->output;
307 entry->neigh = neigh;
308 entry->vccs = NULL;
309 entry->expires = jiffies - 1;
310 return 0;
311 }
312
313 static u32 clip_hash(const void *pkey, const struct net_device *dev, __u32 rnd)
314 {
315 return jhash_2words(*(u32 *) pkey, dev->ifindex, rnd);
316 }
317
318 static struct neigh_table clip_tbl = {
319 .family = AF_INET,
320 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
321 .key_len = 4,
322 .hash = clip_hash,
323 .constructor = clip_constructor,
324 .id = "clip_arp_cache",
325
326 /* parameters are copied from ARP ... */
327 .parms = {
328 .tbl = &clip_tbl,
329 .base_reachable_time = 30 * HZ,
330 .retrans_time = 1 * HZ,
331 .gc_staletime = 60 * HZ,
332 .reachable_time = 30 * HZ,
333 .delay_probe_time = 5 * HZ,
334 .queue_len = 3,
335 .ucast_probes = 3,
336 .mcast_probes = 3,
337 .anycast_delay = 1 * HZ,
338 .proxy_delay = (8 * HZ) / 10,
339 .proxy_qlen = 64,
340 .locktime = 1 * HZ,
341 },
342 .gc_interval = 30 * HZ,
343 .gc_thresh1 = 128,
344 .gc_thresh2 = 512,
345 .gc_thresh3 = 1024,
346 };
347
348 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
349
350 /*
351 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
352 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
353 * don't increment the usage count. This is used to create entries in
354 * clip_setentry.
355 */
356
357 static int clip_encap(struct atm_vcc *vcc, int mode)
358 {
359 CLIP_VCC(vcc)->encap = mode;
360 return 0;
361 }
362
363 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
364 struct net_device *dev)
365 {
366 struct clip_priv *clip_priv = PRIV(dev);
367 struct dst_entry *dst = skb_dst(skb);
368 struct atmarp_entry *entry;
369 struct neighbour *n;
370 struct atm_vcc *vcc;
371 int old;
372 unsigned long flags;
373
374 pr_debug("(skb %p)\n", skb);
375 if (!dst) {
376 pr_err("skb_dst(skb) == NULL\n");
377 dev_kfree_skb(skb);
378 dev->stats.tx_dropped++;
379 return NETDEV_TX_OK;
380 }
381 n = dst_get_neighbour(dst);
382 if (!n) {
383 #if 0
384 n = clip_find_neighbour(skb_dst(skb), 1);
385 if (!n) {
386 dev_kfree_skb(skb); /* lost that one */
387 dev->stats.tx_dropped++;
388 return 0;
389 }
390 dst_set_neighbour(dst, n);
391 #endif
392 pr_err("NO NEIGHBOUR !\n");
393 dev_kfree_skb(skb);
394 dev->stats.tx_dropped++;
395 return NETDEV_TX_OK;
396 }
397 entry = NEIGH2ENTRY(n);
398 if (!entry->vccs) {
399 if (time_after(jiffies, entry->expires)) {
400 /* should be resolved */
401 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
402 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
403 }
404 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
405 skb_queue_tail(&entry->neigh->arp_queue, skb);
406 else {
407 dev_kfree_skb(skb);
408 dev->stats.tx_dropped++;
409 }
410 return NETDEV_TX_OK;
411 }
412 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
413 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
414 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
415 if (entry->vccs->encap) {
416 void *here;
417
418 here = skb_push(skb, RFC1483LLC_LEN);
419 memcpy(here, llc_oui, sizeof(llc_oui));
420 ((__be16 *) here)[3] = skb->protocol;
421 }
422 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
423 ATM_SKB(skb)->atm_options = vcc->atm_options;
424 entry->vccs->last_use = jiffies;
425 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
426 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
427 if (old) {
428 pr_warning("XOFF->XOFF transition\n");
429 return NETDEV_TX_OK;
430 }
431 dev->stats.tx_packets++;
432 dev->stats.tx_bytes += skb->len;
433 vcc->send(vcc, skb);
434 if (atm_may_send(vcc, 0)) {
435 entry->vccs->xoff = 0;
436 return NETDEV_TX_OK;
437 }
438 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
439 netif_stop_queue(dev); /* XOFF -> throttle immediately */
440 barrier();
441 if (!entry->vccs->xoff)
442 netif_start_queue(dev);
443 /* Oh, we just raced with clip_pop. netif_start_queue should be
444 good enough, because nothing should really be asleep because
445 of the brief netif_stop_queue. If this isn't true or if it
446 changes, use netif_wake_queue instead. */
447 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
448 return NETDEV_TX_OK;
449 }
450
451 static int clip_mkip(struct atm_vcc *vcc, int timeout)
452 {
453 struct sk_buff_head *rq, queue;
454 struct clip_vcc *clip_vcc;
455 struct sk_buff *skb, *tmp;
456 unsigned long flags;
457
458 if (!vcc->push)
459 return -EBADFD;
460 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
461 if (!clip_vcc)
462 return -ENOMEM;
463 pr_debug("%p vcc %p\n", clip_vcc, vcc);
464 clip_vcc->vcc = vcc;
465 vcc->user_back = clip_vcc;
466 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
467 clip_vcc->entry = NULL;
468 clip_vcc->xoff = 0;
469 clip_vcc->encap = 1;
470 clip_vcc->last_use = jiffies;
471 clip_vcc->idle_timeout = timeout * HZ;
472 clip_vcc->old_push = vcc->push;
473 clip_vcc->old_pop = vcc->pop;
474 vcc->push = clip_push;
475 vcc->pop = clip_pop;
476
477 __skb_queue_head_init(&queue);
478 rq = &sk_atm(vcc)->sk_receive_queue;
479
480 spin_lock_irqsave(&rq->lock, flags);
481 skb_queue_splice_init(rq, &queue);
482 spin_unlock_irqrestore(&rq->lock, flags);
483
484 /* re-process everything received between connection setup and MKIP */
485 skb_queue_walk_safe(&queue, skb, tmp) {
486 if (!clip_devs) {
487 atm_return(vcc, skb->truesize);
488 kfree_skb(skb);
489 } else {
490 struct net_device *dev = skb->dev;
491 unsigned int len = skb->len;
492
493 skb_get(skb);
494 clip_push(vcc, skb);
495 dev->stats.rx_packets--;
496 dev->stats.rx_bytes -= len;
497 kfree_skb(skb);
498 }
499 }
500 return 0;
501 }
502
503 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
504 {
505 struct neighbour *neigh;
506 struct atmarp_entry *entry;
507 int error;
508 struct clip_vcc *clip_vcc;
509 struct rtable *rt;
510
511 if (vcc->push != clip_push) {
512 pr_warning("non-CLIP VCC\n");
513 return -EBADF;
514 }
515 clip_vcc = CLIP_VCC(vcc);
516 if (!ip) {
517 if (!clip_vcc->entry) {
518 pr_err("hiding hidden ATMARP entry\n");
519 return 0;
520 }
521 pr_debug("remove\n");
522 unlink_clip_vcc(clip_vcc);
523 return 0;
524 }
525 rt = ip_route_output(&init_net, ip, 0, 1, 0);
526 if (IS_ERR(rt))
527 return PTR_ERR(rt);
528 neigh = __neigh_lookup(&clip_tbl, &ip, rt->dst.dev, 1);
529 ip_rt_put(rt);
530 if (!neigh)
531 return -ENOMEM;
532 entry = NEIGH2ENTRY(neigh);
533 if (entry != clip_vcc->entry) {
534 if (!clip_vcc->entry)
535 pr_debug("add\n");
536 else {
537 pr_debug("update\n");
538 unlink_clip_vcc(clip_vcc);
539 }
540 link_vcc(clip_vcc, entry);
541 }
542 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
543 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
544 neigh_release(neigh);
545 return error;
546 }
547
548 static const struct net_device_ops clip_netdev_ops = {
549 .ndo_start_xmit = clip_start_xmit,
550 };
551
552 static void clip_setup(struct net_device *dev)
553 {
554 dev->netdev_ops = &clip_netdev_ops;
555 dev->type = ARPHRD_ATM;
556 dev->hard_header_len = RFC1483LLC_LEN;
557 dev->mtu = RFC1626_MTU;
558 dev->tx_queue_len = 100; /* "normal" queue (packets) */
559 /* When using a "real" qdisc, the qdisc determines the queue */
560 /* length. tx_queue_len is only used for the default case, */
561 /* without any more elaborate queuing. 100 is a reasonable */
562 /* compromise between decent burst-tolerance and protection */
563 /* against memory hogs. */
564 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
565 }
566
567 static int clip_create(int number)
568 {
569 struct net_device *dev;
570 struct clip_priv *clip_priv;
571 int error;
572
573 if (number != -1) {
574 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
575 if (PRIV(dev)->number == number)
576 return -EEXIST;
577 } else {
578 number = 0;
579 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
580 if (PRIV(dev)->number >= number)
581 number = PRIV(dev)->number + 1;
582 }
583 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
584 if (!dev)
585 return -ENOMEM;
586 clip_priv = PRIV(dev);
587 sprintf(dev->name, "atm%d", number);
588 spin_lock_init(&clip_priv->xoff_lock);
589 clip_priv->number = number;
590 error = register_netdev(dev);
591 if (error) {
592 free_netdev(dev);
593 return error;
594 }
595 clip_priv->next = clip_devs;
596 clip_devs = dev;
597 pr_debug("registered (net:%s)\n", dev->name);
598 return number;
599 }
600
601 static int clip_device_event(struct notifier_block *this, unsigned long event,
602 void *arg)
603 {
604 struct net_device *dev = arg;
605
606 if (!net_eq(dev_net(dev), &init_net))
607 return NOTIFY_DONE;
608
609 if (event == NETDEV_UNREGISTER) {
610 neigh_ifdown(&clip_tbl, dev);
611 return NOTIFY_DONE;
612 }
613
614 /* ignore non-CLIP devices */
615 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
616 return NOTIFY_DONE;
617
618 switch (event) {
619 case NETDEV_UP:
620 pr_debug("NETDEV_UP\n");
621 to_atmarpd(act_up, PRIV(dev)->number, 0);
622 break;
623 case NETDEV_GOING_DOWN:
624 pr_debug("NETDEV_DOWN\n");
625 to_atmarpd(act_down, PRIV(dev)->number, 0);
626 break;
627 case NETDEV_CHANGE:
628 case NETDEV_CHANGEMTU:
629 pr_debug("NETDEV_CHANGE*\n");
630 to_atmarpd(act_change, PRIV(dev)->number, 0);
631 break;
632 }
633 return NOTIFY_DONE;
634 }
635
636 static int clip_inet_event(struct notifier_block *this, unsigned long event,
637 void *ifa)
638 {
639 struct in_device *in_dev;
640
641 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
642 /*
643 * Transitions are of the down-change-up type, so it's sufficient to
644 * handle the change on up.
645 */
646 if (event != NETDEV_UP)
647 return NOTIFY_DONE;
648 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
649 }
650
651 static struct notifier_block clip_dev_notifier = {
652 .notifier_call = clip_device_event,
653 };
654
655
656
657 static struct notifier_block clip_inet_notifier = {
658 .notifier_call = clip_inet_event,
659 };
660
661
662
663 static void atmarpd_close(struct atm_vcc *vcc)
664 {
665 pr_debug("\n");
666
667 rtnl_lock();
668 atmarpd = NULL;
669 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
670 rtnl_unlock();
671
672 pr_debug("(done)\n");
673 module_put(THIS_MODULE);
674 }
675
676 static struct atmdev_ops atmarpd_dev_ops = {
677 .close = atmarpd_close
678 };
679
680
681 static struct atm_dev atmarpd_dev = {
682 .ops = &atmarpd_dev_ops,
683 .type = "arpd",
684 .number = 999,
685 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
686 };
687
688
689 static int atm_init_atmarp(struct atm_vcc *vcc)
690 {
691 rtnl_lock();
692 if (atmarpd) {
693 rtnl_unlock();
694 return -EADDRINUSE;
695 }
696
697 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
698
699 atmarpd = vcc;
700 set_bit(ATM_VF_META, &vcc->flags);
701 set_bit(ATM_VF_READY, &vcc->flags);
702 /* allow replies and avoid getting closed if signaling dies */
703 vcc->dev = &atmarpd_dev;
704 vcc_insert_socket(sk_atm(vcc));
705 vcc->push = NULL;
706 vcc->pop = NULL; /* crash */
707 vcc->push_oam = NULL; /* crash */
708 rtnl_unlock();
709 return 0;
710 }
711
712 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
713 {
714 struct atm_vcc *vcc = ATM_SD(sock);
715 int err = 0;
716
717 switch (cmd) {
718 case SIOCMKCLIP:
719 case ATMARPD_CTRL:
720 case ATMARP_MKIP:
721 case ATMARP_SETENTRY:
722 case ATMARP_ENCAP:
723 if (!capable(CAP_NET_ADMIN))
724 return -EPERM;
725 break;
726 default:
727 return -ENOIOCTLCMD;
728 }
729
730 switch (cmd) {
731 case SIOCMKCLIP:
732 err = clip_create(arg);
733 break;
734 case ATMARPD_CTRL:
735 err = atm_init_atmarp(vcc);
736 if (!err) {
737 sock->state = SS_CONNECTED;
738 __module_get(THIS_MODULE);
739 }
740 break;
741 case ATMARP_MKIP:
742 err = clip_mkip(vcc, arg);
743 break;
744 case ATMARP_SETENTRY:
745 err = clip_setentry(vcc, (__force __be32)arg);
746 break;
747 case ATMARP_ENCAP:
748 err = clip_encap(vcc, arg);
749 break;
750 }
751 return err;
752 }
753
754 static struct atm_ioctl clip_ioctl_ops = {
755 .owner = THIS_MODULE,
756 .ioctl = clip_ioctl,
757 };
758
759 #ifdef CONFIG_PROC_FS
760
761 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
762 {
763 static int code[] = { 1, 2, 10, 6, 1, 0 };
764 static int e164[] = { 1, 8, 4, 6, 1, 0 };
765
766 if (*addr->sas_addr.pub) {
767 seq_printf(seq, "%s", addr->sas_addr.pub);
768 if (*addr->sas_addr.prv)
769 seq_putc(seq, '+');
770 } else if (!*addr->sas_addr.prv) {
771 seq_printf(seq, "%s", "(none)");
772 return;
773 }
774 if (*addr->sas_addr.prv) {
775 unsigned char *prv = addr->sas_addr.prv;
776 int *fields;
777 int i, j;
778
779 fields = *prv == ATM_AFI_E164 ? e164 : code;
780 for (i = 0; fields[i]; i++) {
781 for (j = fields[i]; j; j--)
782 seq_printf(seq, "%02X", *prv++);
783 if (fields[i + 1])
784 seq_putc(seq, '.');
785 }
786 }
787 }
788
789 /* This means the neighbour entry has no attached VCC objects. */
790 #define SEQ_NO_VCC_TOKEN ((void *) 2)
791
792 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
793 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
794 {
795 unsigned long exp;
796 char buf[17];
797 int svc, llc, off;
798
799 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
800 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
801
802 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
803
804 if (clip_vcc == SEQ_NO_VCC_TOKEN)
805 exp = entry->neigh->used;
806 else
807 exp = clip_vcc->last_use;
808
809 exp = (jiffies - exp) / HZ;
810
811 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
812 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
813
814 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
815 &entry->ip);
816 while (off < 16)
817 buf[off++] = ' ';
818 buf[off] = '\0';
819 seq_printf(seq, "%s", buf);
820
821 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
822 if (time_before(jiffies, entry->expires))
823 seq_printf(seq, "(resolving)\n");
824 else
825 seq_printf(seq, "(expired, ref %d)\n",
826 atomic_read(&entry->neigh->refcnt));
827 } else if (!svc) {
828 seq_printf(seq, "%d.%d.%d\n",
829 clip_vcc->vcc->dev->number,
830 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
831 } else {
832 svc_addr(seq, &clip_vcc->vcc->remote);
833 seq_putc(seq, '\n');
834 }
835 }
836
837 struct clip_seq_state {
838 /* This member must be first. */
839 struct neigh_seq_state ns;
840
841 /* Local to clip specific iteration. */
842 struct clip_vcc *vcc;
843 };
844
845 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
846 struct clip_vcc *curr)
847 {
848 if (!curr) {
849 curr = e->vccs;
850 if (!curr)
851 return SEQ_NO_VCC_TOKEN;
852 return curr;
853 }
854 if (curr == SEQ_NO_VCC_TOKEN)
855 return NULL;
856
857 curr = curr->next;
858
859 return curr;
860 }
861
862 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
863 struct atmarp_entry *e, loff_t * pos)
864 {
865 struct clip_vcc *vcc = state->vcc;
866
867 vcc = clip_seq_next_vcc(e, vcc);
868 if (vcc && pos != NULL) {
869 while (*pos) {
870 vcc = clip_seq_next_vcc(e, vcc);
871 if (!vcc)
872 break;
873 --(*pos);
874 }
875 }
876 state->vcc = vcc;
877
878 return vcc;
879 }
880
881 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
882 struct neighbour *n, loff_t * pos)
883 {
884 struct clip_seq_state *state = (struct clip_seq_state *)_state;
885
886 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
887 }
888
889 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
890 {
891 struct clip_seq_state *state = seq->private;
892 state->ns.neigh_sub_iter = clip_seq_sub_iter;
893 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
894 }
895
896 static int clip_seq_show(struct seq_file *seq, void *v)
897 {
898 static char atm_arp_banner[] =
899 "IPitf TypeEncp Idle IP address ATM address\n";
900
901 if (v == SEQ_START_TOKEN) {
902 seq_puts(seq, atm_arp_banner);
903 } else {
904 struct clip_seq_state *state = seq->private;
905 struct neighbour *n = v;
906 struct clip_vcc *vcc = state->vcc;
907
908 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
909 }
910 return 0;
911 }
912
913 static const struct seq_operations arp_seq_ops = {
914 .start = clip_seq_start,
915 .next = neigh_seq_next,
916 .stop = neigh_seq_stop,
917 .show = clip_seq_show,
918 };
919
920 static int arp_seq_open(struct inode *inode, struct file *file)
921 {
922 return seq_open_net(inode, file, &arp_seq_ops,
923 sizeof(struct clip_seq_state));
924 }
925
926 static const struct file_operations arp_seq_fops = {
927 .open = arp_seq_open,
928 .read = seq_read,
929 .llseek = seq_lseek,
930 .release = seq_release_net,
931 .owner = THIS_MODULE
932 };
933 #endif
934
935 static void atm_clip_exit_noproc(void);
936
937 static int __init atm_clip_init(void)
938 {
939 neigh_table_init_no_netlink(&clip_tbl);
940
941 clip_tbl_hook = &clip_tbl;
942 register_atm_ioctl(&clip_ioctl_ops);
943 register_netdevice_notifier(&clip_dev_notifier);
944 register_inetaddr_notifier(&clip_inet_notifier);
945
946 setup_timer(&idle_timer, idle_timer_check, 0);
947
948 #ifdef CONFIG_PROC_FS
949 {
950 struct proc_dir_entry *p;
951
952 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
953 if (!p) {
954 pr_err("Unable to initialize /proc/net/atm/arp\n");
955 atm_clip_exit_noproc();
956 return -ENOMEM;
957 }
958 }
959 #endif
960
961 return 0;
962 }
963
964 static void atm_clip_exit_noproc(void)
965 {
966 struct net_device *dev, *next;
967
968 unregister_inetaddr_notifier(&clip_inet_notifier);
969 unregister_netdevice_notifier(&clip_dev_notifier);
970
971 deregister_atm_ioctl(&clip_ioctl_ops);
972
973 /* First, stop the idle timer, so it stops banging
974 * on the table.
975 */
976 del_timer_sync(&idle_timer);
977
978 /* Next, purge the table, so that the device
979 * unregister loop below does not hang due to
980 * device references remaining in the table.
981 */
982 neigh_ifdown(&clip_tbl, NULL);
983
984 dev = clip_devs;
985 while (dev) {
986 next = PRIV(dev)->next;
987 unregister_netdev(dev);
988 free_netdev(dev);
989 dev = next;
990 }
991
992 /* Now it is safe to fully shutdown whole table. */
993 neigh_table_clear(&clip_tbl);
994
995 clip_tbl_hook = NULL;
996 }
997
998 static void __exit atm_clip_exit(void)
999 {
1000 remove_proc_entry("arp", atm_proc_root);
1001
1002 atm_clip_exit_noproc();
1003 }
1004
1005 module_init(atm_clip_init);
1006 module_exit(atm_clip_exit);
1007 MODULE_AUTHOR("Werner Almesberger");
1008 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1009 MODULE_LICENSE("GPL");
Linux with added FPC-III support