Root/
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"); |
1007 |
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