?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / atm / clip.c
blob313aba11316b5764e759fa7356f5f8286d69ceb5
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)
314 {
315 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_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 atmarp_entry *entry;
368 struct atm_vcc *vcc;
369 int old;
370 unsigned long flags;
371
372 pr_debug("(skb %p)\n", skb);
373 if (!skb_dst(skb)) {
374 pr_err("skb_dst(skb) == NULL\n");
375 dev_kfree_skb(skb);
376 dev->stats.tx_dropped++;
377 return NETDEV_TX_OK;
378 }
379 if (!skb_dst(skb)->neighbour) {
380 #if 0
381 skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1);
382 if (!skb_dst(skb)->neighbour) {
383 dev_kfree_skb(skb); /* lost that one */
384 dev->stats.tx_dropped++;
385 return 0;
386 }
387 #endif
388 pr_err("NO NEIGHBOUR !\n");
389 dev_kfree_skb(skb);
390 dev->stats.tx_dropped++;
391 return NETDEV_TX_OK;
392 }
393 entry = NEIGH2ENTRY(skb_dst(skb)->neighbour);
394 if (!entry->vccs) {
395 if (time_after(jiffies, entry->expires)) {
396 /* should be resolved */
397 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
398 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
399 }
400 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
401 skb_queue_tail(&entry->neigh->arp_queue, skb);
402 else {
403 dev_kfree_skb(skb);
404 dev->stats.tx_dropped++;
405 }
406 return NETDEV_TX_OK;
407 }
408 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
409 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
410 pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb)->neighbour, vcc);
411 if (entry->vccs->encap) {
412 void *here;
413
414 here = skb_push(skb, RFC1483LLC_LEN);
415 memcpy(here, llc_oui, sizeof(llc_oui));
416 ((__be16 *) here)[3] = skb->protocol;
417 }
418 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
419 ATM_SKB(skb)->atm_options = vcc->atm_options;
420 entry->vccs->last_use = jiffies;
421 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
422 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
423 if (old) {
424 pr_warning("XOFF->XOFF transition\n");
425 return NETDEV_TX_OK;
426 }
427 dev->stats.tx_packets++;
428 dev->stats.tx_bytes += skb->len;
429 vcc->send(vcc, skb);
430 if (atm_may_send(vcc, 0)) {
431 entry->vccs->xoff = 0;
432 return NETDEV_TX_OK;
433 }
434 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
435 netif_stop_queue(dev); /* XOFF -> throttle immediately */
436 barrier();
437 if (!entry->vccs->xoff)
438 netif_start_queue(dev);
439 /* Oh, we just raced with clip_pop. netif_start_queue should be
440 good enough, because nothing should really be asleep because
441 of the brief netif_stop_queue. If this isn't true or if it
442 changes, use netif_wake_queue instead. */
443 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
444 return NETDEV_TX_OK;
445 }
446
447 static int clip_mkip(struct atm_vcc *vcc, int timeout)
448 {
449 struct sk_buff_head *rq, queue;
450 struct clip_vcc *clip_vcc;
451 struct sk_buff *skb, *tmp;
452 unsigned long flags;
453
454 if (!vcc->push)
455 return -EBADFD;
456 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
457 if (!clip_vcc)
458 return -ENOMEM;
459 pr_debug("%p vcc %p\n", clip_vcc, vcc);
460 clip_vcc->vcc = vcc;
461 vcc->user_back = clip_vcc;
462 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
463 clip_vcc->entry = NULL;
464 clip_vcc->xoff = 0;
465 clip_vcc->encap = 1;
466 clip_vcc->last_use = jiffies;
467 clip_vcc->idle_timeout = timeout * HZ;
468 clip_vcc->old_push = vcc->push;
469 clip_vcc->old_pop = vcc->pop;
470 vcc->push = clip_push;
471 vcc->pop = clip_pop;
472
473 __skb_queue_head_init(&queue);
474 rq = &sk_atm(vcc)->sk_receive_queue;
475
476 spin_lock_irqsave(&rq->lock, flags);
477 skb_queue_splice_init(rq, &queue);
478 spin_unlock_irqrestore(&rq->lock, flags);
479
480 /* re-process everything received between connection setup and MKIP */
481 skb_queue_walk_safe(&queue, skb, tmp) {
482 if (!clip_devs) {
483 atm_return(vcc, skb->truesize);
484 kfree_skb(skb);
485 } else {
486 struct net_device *dev = skb->dev;
487 unsigned int len = skb->len;
488
489 skb_get(skb);
490 clip_push(vcc, skb);
491 dev->stats.rx_packets--;
492 dev->stats.rx_bytes -= len;
493 kfree_skb(skb);
494 }
495 }
496 return 0;
497 }
498
499 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
500 {
501 struct neighbour *neigh;
502 struct atmarp_entry *entry;
503 int error;
504 struct clip_vcc *clip_vcc;
505 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
506 struct rtable *rt;
507
508 if (vcc->push != clip_push) {
509 pr_warning("non-CLIP VCC\n");
510 return -EBADF;
511 }
512 clip_vcc = CLIP_VCC(vcc);
513 if (!ip) {
514 if (!clip_vcc->entry) {
515 pr_err("hiding hidden ATMARP entry\n");
516 return 0;
517 }
518 pr_debug("remove\n");
519 unlink_clip_vcc(clip_vcc);
520 return 0;
521 }
522 error = ip_route_output_key(&init_net, &rt, &fl);
523 if (error)
524 return error;
525 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
526 ip_rt_put(rt);
527 if (!neigh)
528 return -ENOMEM;
529 entry = NEIGH2ENTRY(neigh);
530 if (entry != clip_vcc->entry) {
531 if (!clip_vcc->entry)
532 pr_debug("add\n");
533 else {
534 pr_debug("update\n");
535 unlink_clip_vcc(clip_vcc);
536 }
537 link_vcc(clip_vcc, entry);
538 }
539 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
540 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
541 neigh_release(neigh);
542 return error;
543 }
544
545 static const struct net_device_ops clip_netdev_ops = {
546 .ndo_start_xmit = clip_start_xmit,
547 };
548
549 static void clip_setup(struct net_device *dev)
550 {
551 dev->netdev_ops = &clip_netdev_ops;
552 dev->type = ARPHRD_ATM;
553 dev->hard_header_len = RFC1483LLC_LEN;
554 dev->mtu = RFC1626_MTU;
555 dev->tx_queue_len = 100; /* "normal" queue (packets) */
556 /* When using a "real" qdisc, the qdisc determines the queue */
557 /* length. tx_queue_len is only used for the default case, */
558 /* without any more elaborate queuing. 100 is a reasonable */
559 /* compromise between decent burst-tolerance and protection */
560 /* against memory hogs. */
561 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
562 }
563
564 static int clip_create(int number)
565 {
566 struct net_device *dev;
567 struct clip_priv *clip_priv;
568 int error;
569
570 if (number != -1) {
571 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
572 if (PRIV(dev)->number == number)
573 return -EEXIST;
574 } else {
575 number = 0;
576 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
577 if (PRIV(dev)->number >= number)
578 number = PRIV(dev)->number + 1;
579 }
580 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
581 if (!dev)
582 return -ENOMEM;
583 clip_priv = PRIV(dev);
584 sprintf(dev->name, "atm%d", number);
585 spin_lock_init(&clip_priv->xoff_lock);
586 clip_priv->number = number;
587 error = register_netdev(dev);
588 if (error) {
589 free_netdev(dev);
590 return error;
591 }
592 clip_priv->next = clip_devs;
593 clip_devs = dev;
594 pr_debug("registered (net:%s)\n", dev->name);
595 return number;
596 }
597
598 static int clip_device_event(struct notifier_block *this, unsigned long event,
599 void *arg)
600 {
601 struct net_device *dev = arg;
602
603 if (!net_eq(dev_net(dev), &init_net))
604 return NOTIFY_DONE;
605
606 if (event == NETDEV_UNREGISTER) {
607 neigh_ifdown(&clip_tbl, dev);
608 return NOTIFY_DONE;
609 }
610
611 /* ignore non-CLIP devices */
612 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
613 return NOTIFY_DONE;
614
615 switch (event) {
616 case NETDEV_UP:
617 pr_debug("NETDEV_UP\n");
618 to_atmarpd(act_up, PRIV(dev)->number, 0);
619 break;
620 case NETDEV_GOING_DOWN:
621 pr_debug("NETDEV_DOWN\n");
622 to_atmarpd(act_down, PRIV(dev)->number, 0);
623 break;
624 case NETDEV_CHANGE:
625 case NETDEV_CHANGEMTU:
626 pr_debug("NETDEV_CHANGE*\n");
627 to_atmarpd(act_change, PRIV(dev)->number, 0);
628 break;
629 }
630 return NOTIFY_DONE;
631 }
632
633 static int clip_inet_event(struct notifier_block *this, unsigned long event,
634 void *ifa)
635 {
636 struct in_device *in_dev;
637
638 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
639 /*
640 * Transitions are of the down-change-up type, so it's sufficient to
641 * handle the change on up.
642 */
643 if (event != NETDEV_UP)
644 return NOTIFY_DONE;
645 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
646 }
647
648 static struct notifier_block clip_dev_notifier = {
649 .notifier_call = clip_device_event,
650 };
651
652
653
654 static struct notifier_block clip_inet_notifier = {
655 .notifier_call = clip_inet_event,
656 };
657
658
659
660 static void atmarpd_close(struct atm_vcc *vcc)
661 {
662 pr_debug("\n");
663
664 rtnl_lock();
665 atmarpd = NULL;
666 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
667 rtnl_unlock();
668
669 pr_debug("(done)\n");
670 module_put(THIS_MODULE);
671 }
672
673 static struct atmdev_ops atmarpd_dev_ops = {
674 .close = atmarpd_close
675 };
676
677
678 static struct atm_dev atmarpd_dev = {
679 .ops = &atmarpd_dev_ops,
680 .type = "arpd",
681 .number = 999,
682 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
683 };
684
685
686 static int atm_init_atmarp(struct atm_vcc *vcc)
687 {
688 rtnl_lock();
689 if (atmarpd) {
690 rtnl_unlock();
691 return -EADDRINUSE;
692 }
693
694 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
695
696 atmarpd = vcc;
697 set_bit(ATM_VF_META, &vcc->flags);
698 set_bit(ATM_VF_READY, &vcc->flags);
699 /* allow replies and avoid getting closed if signaling dies */
700 vcc->dev = &atmarpd_dev;
701 vcc_insert_socket(sk_atm(vcc));
702 vcc->push = NULL;
703 vcc->pop = NULL; /* crash */
704 vcc->push_oam = NULL; /* crash */
705 rtnl_unlock();
706 return 0;
707 }
708
709 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
710 {
711 struct atm_vcc *vcc = ATM_SD(sock);
712 int err = 0;
713
714 switch (cmd) {
715 case SIOCMKCLIP:
716 case ATMARPD_CTRL:
717 case ATMARP_MKIP:
718 case ATMARP_SETENTRY:
719 case ATMARP_ENCAP:
720 if (!capable(CAP_NET_ADMIN))
721 return -EPERM;
722 break;
723 default:
724 return -ENOIOCTLCMD;
725 }
726
727 switch (cmd) {
728 case SIOCMKCLIP:
729 err = clip_create(arg);
730 break;
731 case ATMARPD_CTRL:
732 err = atm_init_atmarp(vcc);
733 if (!err) {
734 sock->state = SS_CONNECTED;
735 __module_get(THIS_MODULE);
736 }
737 break;
738 case ATMARP_MKIP:
739 err = clip_mkip(vcc, arg);
740 break;
741 case ATMARP_SETENTRY:
742 err = clip_setentry(vcc, (__force __be32)arg);
743 break;
744 case ATMARP_ENCAP:
745 err = clip_encap(vcc, arg);
746 break;
747 }
748 return err;
749 }
750
751 static struct atm_ioctl clip_ioctl_ops = {
752 .owner = THIS_MODULE,
753 .ioctl = clip_ioctl,
754 };
755
756 #ifdef CONFIG_PROC_FS
757
758 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
759 {
760 static int code[] = { 1, 2, 10, 6, 1, 0 };
761 static int e164[] = { 1, 8, 4, 6, 1, 0 };
762
763 if (*addr->sas_addr.pub) {
764 seq_printf(seq, "%s", addr->sas_addr.pub);
765 if (*addr->sas_addr.prv)
766 seq_putc(seq, '+');
767 } else if (!*addr->sas_addr.prv) {
768 seq_printf(seq, "%s", "(none)");
769 return;
770 }
771 if (*addr->sas_addr.prv) {
772 unsigned char *prv = addr->sas_addr.prv;
773 int *fields;
774 int i, j;
775
776 fields = *prv == ATM_AFI_E164 ? e164 : code;
777 for (i = 0; fields[i]; i++) {
778 for (j = fields[i]; j; j--)
779 seq_printf(seq, "%02X", *prv++);
780 if (fields[i + 1])
781 seq_putc(seq, '.');
782 }
783 }
784 }
785
786 /* This means the neighbour entry has no attached VCC objects. */
787 #define SEQ_NO_VCC_TOKEN ((void *) 2)
788
789 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
790 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
791 {
792 unsigned long exp;
793 char buf[17];
794 int svc, llc, off;
795
796 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
797 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
798
799 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
800
801 if (clip_vcc == SEQ_NO_VCC_TOKEN)
802 exp = entry->neigh->used;
803 else
804 exp = clip_vcc->last_use;
805
806 exp = (jiffies - exp) / HZ;
807
808 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
809 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
810
811 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
812 &entry->ip);
813 while (off < 16)
814 buf[off++] = ' ';
815 buf[off] = '\0';
816 seq_printf(seq, "%s", buf);
817
818 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
819 if (time_before(jiffies, entry->expires))
820 seq_printf(seq, "(resolving)\n");
821 else
822 seq_printf(seq, "(expired, ref %d)\n",
823 atomic_read(&entry->neigh->refcnt));
824 } else if (!svc) {
825 seq_printf(seq, "%d.%d.%d\n",
826 clip_vcc->vcc->dev->number,
827 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
828 } else {
829 svc_addr(seq, &clip_vcc->vcc->remote);
830 seq_putc(seq, '\n');
831 }
832 }
833
834 struct clip_seq_state {
835 /* This member must be first. */
836 struct neigh_seq_state ns;
837
838 /* Local to clip specific iteration. */
839 struct clip_vcc *vcc;
840 };
841
842 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
843 struct clip_vcc *curr)
844 {
845 if (!curr) {
846 curr = e->vccs;
847 if (!curr)
848 return SEQ_NO_VCC_TOKEN;
849 return curr;
850 }
851 if (curr == SEQ_NO_VCC_TOKEN)
852 return NULL;
853
854 curr = curr->next;
855
856 return curr;
857 }
858
859 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
860 struct atmarp_entry *e, loff_t * pos)
861 {
862 struct clip_vcc *vcc = state->vcc;
863
864 vcc = clip_seq_next_vcc(e, vcc);
865 if (vcc && pos != NULL) {
866 while (*pos) {
867 vcc = clip_seq_next_vcc(e, vcc);
868 if (!vcc)
869 break;
870 --(*pos);
871 }
872 }
873 state->vcc = vcc;
874
875 return vcc;
876 }
877
878 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
879 struct neighbour *n, loff_t * pos)
880 {
881 struct clip_seq_state *state = (struct clip_seq_state *)_state;
882
883 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
884 }
885
886 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
887 {
888 struct clip_seq_state *state = seq->private;
889 state->ns.neigh_sub_iter = clip_seq_sub_iter;
890 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
891 }
892
893 static int clip_seq_show(struct seq_file *seq, void *v)
894 {
895 static char atm_arp_banner[] =
896 "IPitf TypeEncp Idle IP address ATM address\n";
897
898 if (v == SEQ_START_TOKEN) {
899 seq_puts(seq, atm_arp_banner);
900 } else {
901 struct clip_seq_state *state = seq->private;
902 struct neighbour *n = v;
903 struct clip_vcc *vcc = state->vcc;
904
905 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
906 }
907 return 0;
908 }
909
910 static const struct seq_operations arp_seq_ops = {
911 .start = clip_seq_start,
912 .next = neigh_seq_next,
913 .stop = neigh_seq_stop,
914 .show = clip_seq_show,
915 };
916
917 static int arp_seq_open(struct inode *inode, struct file *file)
918 {
919 return seq_open_net(inode, file, &arp_seq_ops,
920 sizeof(struct clip_seq_state));
921 }
922
923 static const struct file_operations arp_seq_fops = {
924 .open = arp_seq_open,
925 .read = seq_read,
926 .llseek = seq_lseek,
927 .release = seq_release_net,
928 .owner = THIS_MODULE
929 };
930 #endif
931
932 static void atm_clip_exit_noproc(void);
933
934 static int __init atm_clip_init(void)
935 {
936 neigh_table_init_no_netlink(&clip_tbl);
937
938 clip_tbl_hook = &clip_tbl;
939 register_atm_ioctl(&clip_ioctl_ops);
940 register_netdevice_notifier(&clip_dev_notifier);
941 register_inetaddr_notifier(&clip_inet_notifier);
942
943 setup_timer(&idle_timer, idle_timer_check, 0);
944
945 #ifdef CONFIG_PROC_FS
946 {
947 struct proc_dir_entry *p;
948
949 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
950 if (!p) {
951 pr_err("Unable to initialize /proc/net/atm/arp\n");
952 atm_clip_exit_noproc();
953 return -ENOMEM;
954 }
955 }
956 #endif
957
958 return 0;
959 }
960
961 static void atm_clip_exit_noproc(void)
962 {
963 struct net_device *dev, *next;
964
965 unregister_inetaddr_notifier(&clip_inet_notifier);
966 unregister_netdevice_notifier(&clip_dev_notifier);
967
968 deregister_atm_ioctl(&clip_ioctl_ops);
969
970 /* First, stop the idle timer, so it stops banging
971 * on the table.
972 */
973 del_timer_sync(&idle_timer);
974
975 /* Next, purge the table, so that the device
976 * unregister loop below does not hang due to
977 * device references remaining in the table.
978 */
979 neigh_ifdown(&clip_tbl, NULL);
980
981 dev = clip_devs;
982 while (dev) {
983 next = PRIV(dev)->next;
984 unregister_netdev(dev);
985 free_netdev(dev);
986 dev = next;
987 }
988
989 /* Now it is safe to fully shutdown whole table. */
990 neigh_table_clear(&clip_tbl);
991
992 clip_tbl_hook = NULL;
993 }
994
995 static void __exit atm_clip_exit(void)
996 {
997 remove_proc_entry("arp", atm_proc_root);
998
999 atm_clip_exit_noproc();
1000 }
1001
1002 module_init(atm_clip_init);
1003 module_exit(atm_clip_exit);
1004 MODULE_AUTHOR("Werner Almesberger");
1005 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1006 MODULE_LICENSE("GPL");
linux-next