?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mm: document /sys/devices/system/node/nodeX
[linux-2.6.git] / net / atm / clip.c
blobebfa022008f79aff20202c2c13ae0b04ee117d81
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 <net/route.h> /* for struct rtable and routing */
34 #include <net/icmp.h> /* icmp_send */
35 #include <linux/param.h> /* for HZ */
36 #include <linux/uaccess.h>
37 #include <asm/byteorder.h> /* for htons etc. */
38 #include <asm/system.h> /* save/restore_flags */
39 #include <asm/atomic.h>
40
41 #include "common.h"
42 #include "resources.h"
43 #include <net/atmclip.h>
44
45 static struct net_device *clip_devs;
46 static struct atm_vcc *atmarpd;
47 static struct neigh_table clip_tbl;
48 static struct timer_list idle_timer;
49
50 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
51 {
52 struct sock *sk;
53 struct atmarp_ctrl *ctrl;
54 struct sk_buff *skb;
55
56 pr_debug("(%d)\n", type);
57 if (!atmarpd)
58 return -EUNATCH;
59 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
60 if (!skb)
61 return -ENOMEM;
62 ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl));
63 ctrl->type = type;
64 ctrl->itf_num = itf;
65 ctrl->ip = ip;
66 atm_force_charge(atmarpd, skb->truesize);
67
68 sk = sk_atm(atmarpd);
69 skb_queue_tail(&sk->sk_receive_queue, skb);
70 sk->sk_data_ready(sk, skb->len);
71 return 0;
72 }
73
74 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
75 {
76 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
77 clip_vcc->entry = entry;
78 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
79 clip_vcc->next = entry->vccs;
80 entry->vccs = clip_vcc;
81 entry->neigh->used = jiffies;
82 }
83
84 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
85 {
86 struct atmarp_entry *entry = clip_vcc->entry;
87 struct clip_vcc **walk;
88
89 if (!entry) {
90 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
91 return;
92 }
93 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
94 entry->neigh->used = jiffies;
95 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
96 if (*walk == clip_vcc) {
97 int error;
98
99 *walk = clip_vcc->next; /* atomic */
100 clip_vcc->entry = NULL;
101 if (clip_vcc->xoff)
102 netif_wake_queue(entry->neigh->dev);
103 if (entry->vccs)
104 goto out;
105 entry->expires = jiffies - 1;
106 /* force resolution or expiration */
107 error = neigh_update(entry->neigh, NULL, NUD_NONE,
108 NEIGH_UPDATE_F_ADMIN);
109 if (error)
110 pr_crit("neigh_update failed with %d\n", error);
111 goto out;
112 }
113 pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc);
114 out:
115 netif_tx_unlock_bh(entry->neigh->dev);
116 }
117
118 /* The neighbour entry n->lock is held. */
119 static int neigh_check_cb(struct neighbour *n)
120 {
121 struct atmarp_entry *entry = NEIGH2ENTRY(n);
122 struct clip_vcc *cv;
123
124 for (cv = entry->vccs; cv; cv = cv->next) {
125 unsigned long exp = cv->last_use + cv->idle_timeout;
126
127 if (cv->idle_timeout && time_after(jiffies, exp)) {
128 pr_debug("releasing vcc %p->%p of entry %p\n",
129 cv, cv->vcc, entry);
130 vcc_release_async(cv->vcc, -ETIMEDOUT);
131 }
132 }
133
134 if (entry->vccs || time_before(jiffies, entry->expires))
135 return 0;
136
137 if (atomic_read(&n->refcnt) > 1) {
138 struct sk_buff *skb;
139
140 pr_debug("destruction postponed with ref %d\n",
141 atomic_read(&n->refcnt));
142
143 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
144 dev_kfree_skb(skb);
145
146 return 0;
147 }
148
149 pr_debug("expired neigh %p\n", n);
150 return 1;
151 }
152
153 static void idle_timer_check(unsigned long dummy)
154 {
155 write_lock(&clip_tbl.lock);
156 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
157 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
158 write_unlock(&clip_tbl.lock);
159 }
160
161 static int clip_arp_rcv(struct sk_buff *skb)
162 {
163 struct atm_vcc *vcc;
164
165 pr_debug("\n");
166 vcc = ATM_SKB(skb)->vcc;
167 if (!vcc || !atm_charge(vcc, skb->truesize)) {
168 dev_kfree_skb_any(skb);
169 return 0;
170 }
171 pr_debug("pushing to %p\n", vcc);
172 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
173 CLIP_VCC(vcc)->old_push(vcc, skb);
174 return 0;
175 }
176
177 static const unsigned char llc_oui[] = {
178 0xaa, /* DSAP: non-ISO */
179 0xaa, /* SSAP: non-ISO */
180 0x03, /* Ctrl: Unnumbered Information Command PDU */
181 0x00, /* OUI: EtherType */
182 0x00,
183 0x00
184 };
185
186 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
187 {
188 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
189
190 pr_debug("\n");
191 if (!skb) {
192 pr_debug("removing VCC %p\n", clip_vcc);
193 if (clip_vcc->entry)
194 unlink_clip_vcc(clip_vcc);
195 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
196 kfree(clip_vcc);
197 return;
198 }
199 atm_return(vcc, skb->truesize);
200 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
201 /* clip_vcc->entry == NULL if we don't have an IP address yet */
202 if (!skb->dev) {
203 dev_kfree_skb_any(skb);
204 return;
205 }
206 ATM_SKB(skb)->vcc = vcc;
207 skb_reset_mac_header(skb);
208 if (!clip_vcc->encap ||
209 skb->len < RFC1483LLC_LEN ||
210 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
211 skb->protocol = htons(ETH_P_IP);
212 else {
213 skb->protocol = ((__be16 *)skb->data)[3];
214 skb_pull(skb, RFC1483LLC_LEN);
215 if (skb->protocol == htons(ETH_P_ARP)) {
216 skb->dev->stats.rx_packets++;
217 skb->dev->stats.rx_bytes += skb->len;
218 clip_arp_rcv(skb);
219 return;
220 }
221 }
222 clip_vcc->last_use = jiffies;
223 skb->dev->stats.rx_packets++;
224 skb->dev->stats.rx_bytes += skb->len;
225 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
226 netif_rx(skb);
227 }
228
229 /*
230 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
231 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
232 */
233
234 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
235 {
236 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
237 struct net_device *dev = skb->dev;
238 int old;
239 unsigned long flags;
240
241 pr_debug("(vcc %p)\n", vcc);
242 clip_vcc->old_pop(vcc, skb);
243 /* skb->dev == NULL in outbound ARP packets */
244 if (!dev)
245 return;
246 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
247 if (atm_may_send(vcc, 0)) {
248 old = xchg(&clip_vcc->xoff, 0);
249 if (old)
250 netif_wake_queue(dev);
251 }
252 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
253 }
254
255 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
256 {
257 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
258 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
259 }
260
261 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
262 {
263 #ifndef CONFIG_ATM_CLIP_NO_ICMP
264 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
265 #endif
266 kfree_skb(skb);
267 }
268
269 static const struct neigh_ops clip_neigh_ops = {
270 .family = AF_INET,
271 .solicit = clip_neigh_solicit,
272 .error_report = clip_neigh_error,
273 .output = dev_queue_xmit,
274 .connected_output = dev_queue_xmit,
275 .hh_output = dev_queue_xmit,
276 .queue_xmit = dev_queue_xmit,
277 };
278
279 static int clip_constructor(struct neighbour *neigh)
280 {
281 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
282 struct net_device *dev = neigh->dev;
283 struct in_device *in_dev;
284 struct neigh_parms *parms;
285
286 pr_debug("(neigh %p, entry %p)\n", neigh, entry);
287 neigh->type = inet_addr_type(&init_net, entry->ip);
288 if (neigh->type != RTN_UNICAST)
289 return -EINVAL;
290
291 rcu_read_lock();
292 in_dev = __in_dev_get_rcu(dev);
293 if (!in_dev) {
294 rcu_read_unlock();
295 return -EINVAL;
296 }
297
298 parms = in_dev->arp_parms;
299 __neigh_parms_put(neigh->parms);
300 neigh->parms = neigh_parms_clone(parms);
301 rcu_read_unlock();
302
303 neigh->ops = &clip_neigh_ops;
304 neigh->output = neigh->nud_state & NUD_VALID ?
305 neigh->ops->connected_output : neigh->ops->output;
306 entry->neigh = neigh;
307 entry->vccs = NULL;
308 entry->expires = jiffies - 1;
309 return 0;
310 }
311
312 static u32 clip_hash(const void *pkey, const struct net_device *dev)
313 {
314 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
315 }
316
317 static struct neigh_table clip_tbl = {
318 .family = AF_INET,
319 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
320 .key_len = 4,
321 .hash = clip_hash,
322 .constructor = clip_constructor,
323 .id = "clip_arp_cache",
324
325 /* parameters are copied from ARP ... */
326 .parms = {
327 .tbl = &clip_tbl,
328 .base_reachable_time = 30 * HZ,
329 .retrans_time = 1 * HZ,
330 .gc_staletime = 60 * HZ,
331 .reachable_time = 30 * HZ,
332 .delay_probe_time = 5 * HZ,
333 .queue_len = 3,
334 .ucast_probes = 3,
335 .mcast_probes = 3,
336 .anycast_delay = 1 * HZ,
337 .proxy_delay = (8 * HZ) / 10,
338 .proxy_qlen = 64,
339 .locktime = 1 * HZ,
340 },
341 .gc_interval = 30 * HZ,
342 .gc_thresh1 = 128,
343 .gc_thresh2 = 512,
344 .gc_thresh3 = 1024,
345 };
346
347 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
348
349 /*
350 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
351 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
352 * don't increment the usage count. This is used to create entries in
353 * clip_setentry.
354 */
355
356 static int clip_encap(struct atm_vcc *vcc, int mode)
357 {
358 CLIP_VCC(vcc)->encap = mode;
359 return 0;
360 }
361
362 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
363 struct net_device *dev)
364 {
365 struct clip_priv *clip_priv = PRIV(dev);
366 struct atmarp_entry *entry;
367 struct atm_vcc *vcc;
368 int old;
369 unsigned long flags;
370
371 pr_debug("(skb %p)\n", skb);
372 if (!skb_dst(skb)) {
373 pr_err("skb_dst(skb) == NULL\n");
374 dev_kfree_skb(skb);
375 dev->stats.tx_dropped++;
376 return NETDEV_TX_OK;
377 }
378 if (!skb_dst(skb)->neighbour) {
379 #if 0
380 skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1);
381 if (!skb_dst(skb)->neighbour) {
382 dev_kfree_skb(skb); /* lost that one */
383 dev->stats.tx_dropped++;
384 return 0;
385 }
386 #endif
387 pr_err("NO NEIGHBOUR !\n");
388 dev_kfree_skb(skb);
389 dev->stats.tx_dropped++;
390 return NETDEV_TX_OK;
391 }
392 entry = NEIGH2ENTRY(skb_dst(skb)->neighbour);
393 if (!entry->vccs) {
394 if (time_after(jiffies, entry->expires)) {
395 /* should be resolved */
396 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
397 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
398 }
399 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
400 skb_queue_tail(&entry->neigh->arp_queue, skb);
401 else {
402 dev_kfree_skb(skb);
403 dev->stats.tx_dropped++;
404 }
405 return NETDEV_TX_OK;
406 }
407 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
408 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
409 pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb)->neighbour, vcc);
410 if (entry->vccs->encap) {
411 void *here;
412
413 here = skb_push(skb, RFC1483LLC_LEN);
414 memcpy(here, llc_oui, sizeof(llc_oui));
415 ((__be16 *) here)[3] = skb->protocol;
416 }
417 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
418 ATM_SKB(skb)->atm_options = vcc->atm_options;
419 entry->vccs->last_use = jiffies;
420 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
421 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
422 if (old) {
423 pr_warning("XOFF->XOFF transition\n");
424 return NETDEV_TX_OK;
425 }
426 dev->stats.tx_packets++;
427 dev->stats.tx_bytes += skb->len;
428 vcc->send(vcc, skb);
429 if (atm_may_send(vcc, 0)) {
430 entry->vccs->xoff = 0;
431 return NETDEV_TX_OK;
432 }
433 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
434 netif_stop_queue(dev); /* XOFF -> throttle immediately */
435 barrier();
436 if (!entry->vccs->xoff)
437 netif_start_queue(dev);
438 /* Oh, we just raced with clip_pop. netif_start_queue should be
439 good enough, because nothing should really be asleep because
440 of the brief netif_stop_queue. If this isn't true or if it
441 changes, use netif_wake_queue instead. */
442 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
443 return NETDEV_TX_OK;
444 }
445
446 static int clip_mkip(struct atm_vcc *vcc, int timeout)
447 {
448 struct sk_buff_head *rq, queue;
449 struct clip_vcc *clip_vcc;
450 struct sk_buff *skb, *tmp;
451 unsigned long flags;
452
453 if (!vcc->push)
454 return -EBADFD;
455 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
456 if (!clip_vcc)
457 return -ENOMEM;
458 pr_debug("%p vcc %p\n", clip_vcc, vcc);
459 clip_vcc->vcc = vcc;
460 vcc->user_back = clip_vcc;
461 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
462 clip_vcc->entry = NULL;
463 clip_vcc->xoff = 0;
464 clip_vcc->encap = 1;
465 clip_vcc->last_use = jiffies;
466 clip_vcc->idle_timeout = timeout * HZ;
467 clip_vcc->old_push = vcc->push;
468 clip_vcc->old_pop = vcc->pop;
469 vcc->push = clip_push;
470 vcc->pop = clip_pop;
471
472 __skb_queue_head_init(&queue);
473 rq = &sk_atm(vcc)->sk_receive_queue;
474
475 spin_lock_irqsave(&rq->lock, flags);
476 skb_queue_splice_init(rq, &queue);
477 spin_unlock_irqrestore(&rq->lock, flags);
478
479 /* re-process everything received between connection setup and MKIP */
480 skb_queue_walk_safe(&queue, skb, tmp) {
481 if (!clip_devs) {
482 atm_return(vcc, skb->truesize);
483 kfree_skb(skb);
484 } else {
485 struct net_device *dev = skb->dev;
486 unsigned int len = skb->len;
487
488 skb_get(skb);
489 clip_push(vcc, skb);
490 dev->stats.rx_packets--;
491 dev->stats.rx_bytes -= len;
492 kfree_skb(skb);
493 }
494 }
495 return 0;
496 }
497
498 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
499 {
500 struct neighbour *neigh;
501 struct atmarp_entry *entry;
502 int error;
503 struct clip_vcc *clip_vcc;
504 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
505 struct rtable *rt;
506
507 if (vcc->push != clip_push) {
508 pr_warning("non-CLIP VCC\n");
509 return -EBADF;
510 }
511 clip_vcc = CLIP_VCC(vcc);
512 if (!ip) {
513 if (!clip_vcc->entry) {
514 pr_err("hiding hidden ATMARP entry\n");
515 return 0;
516 }
517 pr_debug("remove\n");
518 unlink_clip_vcc(clip_vcc);
519 return 0;
520 }
521 error = ip_route_output_key(&init_net, &rt, &fl);
522 if (error)
523 return error;
524 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
525 ip_rt_put(rt);
526 if (!neigh)
527 return -ENOMEM;
528 entry = NEIGH2ENTRY(neigh);
529 if (entry != clip_vcc->entry) {
530 if (!clip_vcc->entry)
531 pr_debug("add\n");
532 else {
533 pr_debug("update\n");
534 unlink_clip_vcc(clip_vcc);
535 }
536 link_vcc(clip_vcc, entry);
537 }
538 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
539 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
540 neigh_release(neigh);
541 return error;
542 }
543
544 static const struct net_device_ops clip_netdev_ops = {
545 .ndo_start_xmit = clip_start_xmit,
546 };
547
548 static void clip_setup(struct net_device *dev)
549 {
550 dev->netdev_ops = &clip_netdev_ops;
551 dev->type = ARPHRD_ATM;
552 dev->hard_header_len = RFC1483LLC_LEN;
553 dev->mtu = RFC1626_MTU;
554 dev->tx_queue_len = 100; /* "normal" queue (packets) */
555 /* When using a "real" qdisc, the qdisc determines the queue */
556 /* length. tx_queue_len is only used for the default case, */
557 /* without any more elaborate queuing. 100 is a reasonable */
558 /* compromise between decent burst-tolerance and protection */
559 /* against memory hogs. */
560 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
561 }
562
563 static int clip_create(int number)
564 {
565 struct net_device *dev;
566 struct clip_priv *clip_priv;
567 int error;
568
569 if (number != -1) {
570 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
571 if (PRIV(dev)->number == number)
572 return -EEXIST;
573 } else {
574 number = 0;
575 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
576 if (PRIV(dev)->number >= number)
577 number = PRIV(dev)->number + 1;
578 }
579 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
580 if (!dev)
581 return -ENOMEM;
582 clip_priv = PRIV(dev);
583 sprintf(dev->name, "atm%d", number);
584 spin_lock_init(&clip_priv->xoff_lock);
585 clip_priv->number = number;
586 error = register_netdev(dev);
587 if (error) {
588 free_netdev(dev);
589 return error;
590 }
591 clip_priv->next = clip_devs;
592 clip_devs = dev;
593 pr_debug("registered (net:%s)\n", dev->name);
594 return number;
595 }
596
597 static int clip_device_event(struct notifier_block *this, unsigned long event,
598 void *arg)
599 {
600 struct net_device *dev = arg;
601
602 if (!net_eq(dev_net(dev), &init_net))
603 return NOTIFY_DONE;
604
605 if (event == NETDEV_UNREGISTER) {
606 neigh_ifdown(&clip_tbl, dev);
607 return NOTIFY_DONE;
608 }
609
610 /* ignore non-CLIP devices */
611 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
612 return NOTIFY_DONE;
613
614 switch (event) {
615 case NETDEV_UP:
616 pr_debug("NETDEV_UP\n");
617 to_atmarpd(act_up, PRIV(dev)->number, 0);
618 break;
619 case NETDEV_GOING_DOWN:
620 pr_debug("NETDEV_DOWN\n");
621 to_atmarpd(act_down, PRIV(dev)->number, 0);
622 break;
623 case NETDEV_CHANGE:
624 case NETDEV_CHANGEMTU:
625 pr_debug("NETDEV_CHANGE*\n");
626 to_atmarpd(act_change, PRIV(dev)->number, 0);
627 break;
628 }
629 return NOTIFY_DONE;
630 }
631
632 static int clip_inet_event(struct notifier_block *this, unsigned long event,
633 void *ifa)
634 {
635 struct in_device *in_dev;
636
637 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
638 /*
639 * Transitions are of the down-change-up type, so it's sufficient to
640 * handle the change on up.
641 */
642 if (event != NETDEV_UP)
643 return NOTIFY_DONE;
644 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
645 }
646
647 static struct notifier_block clip_dev_notifier = {
648 .notifier_call = clip_device_event,
649 };
650
651
652
653 static struct notifier_block clip_inet_notifier = {
654 .notifier_call = clip_inet_event,
655 };
656
657
658
659 static void atmarpd_close(struct atm_vcc *vcc)
660 {
661 pr_debug("\n");
662
663 rtnl_lock();
664 atmarpd = NULL;
665 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
666 rtnl_unlock();
667
668 pr_debug("(done)\n");
669 module_put(THIS_MODULE);
670 }
671
672 static struct atmdev_ops atmarpd_dev_ops = {
673 .close = atmarpd_close
674 };
675
676
677 static struct atm_dev atmarpd_dev = {
678 .ops = &atmarpd_dev_ops,
679 .type = "arpd",
680 .number = 999,
681 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
682 };
683
684
685 static int atm_init_atmarp(struct atm_vcc *vcc)
686 {
687 rtnl_lock();
688 if (atmarpd) {
689 rtnl_unlock();
690 return -EADDRINUSE;
691 }
692
693 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
694
695 atmarpd = vcc;
696 set_bit(ATM_VF_META, &vcc->flags);
697 set_bit(ATM_VF_READY, &vcc->flags);
698 /* allow replies and avoid getting closed if signaling dies */
699 vcc->dev = &atmarpd_dev;
700 vcc_insert_socket(sk_atm(vcc));
701 vcc->push = NULL;
702 vcc->pop = NULL; /* crash */
703 vcc->push_oam = NULL; /* crash */
704 rtnl_unlock();
705 return 0;
706 }
707
708 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
709 {
710 struct atm_vcc *vcc = ATM_SD(sock);
711 int err = 0;
712
713 switch (cmd) {
714 case SIOCMKCLIP:
715 case ATMARPD_CTRL:
716 case ATMARP_MKIP:
717 case ATMARP_SETENTRY:
718 case ATMARP_ENCAP:
719 if (!capable(CAP_NET_ADMIN))
720 return -EPERM;
721 break;
722 default:
723 return -ENOIOCTLCMD;
724 }
725
726 switch (cmd) {
727 case SIOCMKCLIP:
728 err = clip_create(arg);
729 break;
730 case ATMARPD_CTRL:
731 err = atm_init_atmarp(vcc);
732 if (!err) {
733 sock->state = SS_CONNECTED;
734 __module_get(THIS_MODULE);
735 }
736 break;
737 case ATMARP_MKIP:
738 err = clip_mkip(vcc, arg);
739 break;
740 case ATMARP_SETENTRY:
741 err = clip_setentry(vcc, (__force __be32)arg);
742 break;
743 case ATMARP_ENCAP:
744 err = clip_encap(vcc, arg);
745 break;
746 }
747 return err;
748 }
749
750 static struct atm_ioctl clip_ioctl_ops = {
751 .owner = THIS_MODULE,
752 .ioctl = clip_ioctl,
753 };
754
755 #ifdef CONFIG_PROC_FS
756
757 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
758 {
759 static int code[] = { 1, 2, 10, 6, 1, 0 };
760 static int e164[] = { 1, 8, 4, 6, 1, 0 };
761
762 if (*addr->sas_addr.pub) {
763 seq_printf(seq, "%s", addr->sas_addr.pub);
764 if (*addr->sas_addr.prv)
765 seq_putc(seq, '+');
766 } else if (!*addr->sas_addr.prv) {
767 seq_printf(seq, "%s", "(none)");
768 return;
769 }
770 if (*addr->sas_addr.prv) {
771 unsigned char *prv = addr->sas_addr.prv;
772 int *fields;
773 int i, j;
774
775 fields = *prv == ATM_AFI_E164 ? e164 : code;
776 for (i = 0; fields[i]; i++) {
777 for (j = fields[i]; j; j--)
778 seq_printf(seq, "%02X", *prv++);
779 if (fields[i + 1])
780 seq_putc(seq, '.');
781 }
782 }
783 }
784
785 /* This means the neighbour entry has no attached VCC objects. */
786 #define SEQ_NO_VCC_TOKEN ((void *) 2)
787
788 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
789 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
790 {
791 unsigned long exp;
792 char buf[17];
793 int svc, llc, off;
794
795 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
796 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
797
798 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
799
800 if (clip_vcc == SEQ_NO_VCC_TOKEN)
801 exp = entry->neigh->used;
802 else
803 exp = clip_vcc->last_use;
804
805 exp = (jiffies - exp) / HZ;
806
807 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
808 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
809
810 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
811 &entry->ip);
812 while (off < 16)
813 buf[off++] = ' ';
814 buf[off] = '\0';
815 seq_printf(seq, "%s", buf);
816
817 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
818 if (time_before(jiffies, entry->expires))
819 seq_printf(seq, "(resolving)\n");
820 else
821 seq_printf(seq, "(expired, ref %d)\n",
822 atomic_read(&entry->neigh->refcnt));
823 } else if (!svc) {
824 seq_printf(seq, "%d.%d.%d\n",
825 clip_vcc->vcc->dev->number,
826 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
827 } else {
828 svc_addr(seq, &clip_vcc->vcc->remote);
829 seq_putc(seq, '\n');
830 }
831 }
832
833 struct clip_seq_state {
834 /* This member must be first. */
835 struct neigh_seq_state ns;
836
837 /* Local to clip specific iteration. */
838 struct clip_vcc *vcc;
839 };
840
841 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
842 struct clip_vcc *curr)
843 {
844 if (!curr) {
845 curr = e->vccs;
846 if (!curr)
847 return SEQ_NO_VCC_TOKEN;
848 return curr;
849 }
850 if (curr == SEQ_NO_VCC_TOKEN)
851 return NULL;
852
853 curr = curr->next;
854
855 return curr;
856 }
857
858 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
859 struct atmarp_entry *e, loff_t * pos)
860 {
861 struct clip_vcc *vcc = state->vcc;
862
863 vcc = clip_seq_next_vcc(e, vcc);
864 if (vcc && pos != NULL) {
865 while (*pos) {
866 vcc = clip_seq_next_vcc(e, vcc);
867 if (!vcc)
868 break;
869 --(*pos);
870 }
871 }
872 state->vcc = vcc;
873
874 return vcc;
875 }
876
877 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
878 struct neighbour *n, loff_t * pos)
879 {
880 struct clip_seq_state *state = (struct clip_seq_state *)_state;
881
882 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
883 }
884
885 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
886 {
887 struct clip_seq_state *state = seq->private;
888 state->ns.neigh_sub_iter = clip_seq_sub_iter;
889 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
890 }
891
892 static int clip_seq_show(struct seq_file *seq, void *v)
893 {
894 static char atm_arp_banner[] =
895 "IPitf TypeEncp Idle IP address ATM address\n";
896
897 if (v == SEQ_START_TOKEN) {
898 seq_puts(seq, atm_arp_banner);
899 } else {
900 struct clip_seq_state *state = seq->private;
901 struct neighbour *n = v;
902 struct clip_vcc *vcc = state->vcc;
903
904 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
905 }
906 return 0;
907 }
908
909 static const struct seq_operations arp_seq_ops = {
910 .start = clip_seq_start,
911 .next = neigh_seq_next,
912 .stop = neigh_seq_stop,
913 .show = clip_seq_show,
914 };
915
916 static int arp_seq_open(struct inode *inode, struct file *file)
917 {
918 return seq_open_net(inode, file, &arp_seq_ops,
919 sizeof(struct clip_seq_state));
920 }
921
922 static const struct file_operations arp_seq_fops = {
923 .open = arp_seq_open,
924 .read = seq_read,
925 .llseek = seq_lseek,
926 .release = seq_release_net,
927 .owner = THIS_MODULE
928 };
929 #endif
930
931 static void atm_clip_exit_noproc(void);
932
933 static int __init atm_clip_init(void)
934 {
935 neigh_table_init_no_netlink(&clip_tbl);
936
937 clip_tbl_hook = &clip_tbl;
938 register_atm_ioctl(&clip_ioctl_ops);
939 register_netdevice_notifier(&clip_dev_notifier);
940 register_inetaddr_notifier(&clip_inet_notifier);
941
942 setup_timer(&idle_timer, idle_timer_check, 0);
943
944 #ifdef CONFIG_PROC_FS
945 {
946 struct proc_dir_entry *p;
947
948 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
949 if (!p) {
950 pr_err("Unable to initialize /proc/net/atm/arp\n");
951 atm_clip_exit_noproc();
952 return -ENOMEM;
953 }
954 }
955 #endif
956
957 return 0;
958 }
959
960 static void atm_clip_exit_noproc(void)
961 {
962 struct net_device *dev, *next;
963
964 unregister_inetaddr_notifier(&clip_inet_notifier);
965 unregister_netdevice_notifier(&clip_dev_notifier);
966
967 deregister_atm_ioctl(&clip_ioctl_ops);
968
969 /* First, stop the idle timer, so it stops banging
970 * on the table.
971 */
972 del_timer_sync(&idle_timer);
973
974 /* Next, purge the table, so that the device
975 * unregister loop below does not hang due to
976 * device references remaining in the table.
977 */
978 neigh_ifdown(&clip_tbl, NULL);
979
980 dev = clip_devs;
981 while (dev) {
982 next = PRIV(dev)->next;
983 unregister_netdev(dev);
984 free_netdev(dev);
985 dev = next;
986 }
987
988 /* Now it is safe to fully shutdown whole table. */
989 neigh_table_clear(&clip_tbl);
990
991 clip_tbl_hook = NULL;
992 }
993
994 static void __exit atm_clip_exit(void)
995 {
996 remove_proc_entry("arp", atm_proc_root);
997
998 atm_clip_exit_noproc();
999 }
1000
1001 module_init(atm_clip_init);
1002 module_exit(atm_clip_exit);
1003 MODULE_AUTHOR("Werner Almesberger");
1004 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1005 MODULE_LICENSE("GPL");
Linus' kernel tree