]>
Commit | Line | Data |
---|---|---|
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 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 = { .fl4_dst = ip, | |
506 | .fl4_tos = 1 }; | |
507 | struct rtable *rt; | |
508 | ||
509 | if (vcc->push != clip_push) { | |
510 | pr_warning("non-CLIP VCC\n"); | |
511 | return -EBADF; | |
512 | } | |
513 | clip_vcc = CLIP_VCC(vcc); | |
514 | if (!ip) { | |
515 | if (!clip_vcc->entry) { | |
516 | pr_err("hiding hidden ATMARP entry\n"); | |
517 | return 0; | |
518 | } | |
519 | pr_debug("remove\n"); | |
520 | unlink_clip_vcc(clip_vcc); | |
521 | return 0; | |
522 | } | |
523 | error = ip_route_output_key(&init_net, &rt, &fl); | |
524 | if (error) | |
525 | return error; | |
526 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->dst.dev, 1); | |
527 | ip_rt_put(rt); | |
528 | if (!neigh) | |
529 | return -ENOMEM; | |
530 | entry = NEIGH2ENTRY(neigh); | |
531 | if (entry != clip_vcc->entry) { | |
532 | if (!clip_vcc->entry) | |
533 | pr_debug("add\n"); | |
534 | else { | |
535 | pr_debug("update\n"); | |
536 | unlink_clip_vcc(clip_vcc); | |
537 | } | |
538 | link_vcc(clip_vcc, entry); | |
539 | } | |
540 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, | |
541 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
542 | neigh_release(neigh); | |
543 | return error; | |
544 | } | |
545 | ||
546 | static const struct net_device_ops clip_netdev_ops = { | |
547 | .ndo_start_xmit = clip_start_xmit, | |
548 | }; | |
549 | ||
550 | static void clip_setup(struct net_device *dev) | |
551 | { | |
552 | dev->netdev_ops = &clip_netdev_ops; | |
553 | dev->type = ARPHRD_ATM; | |
554 | dev->hard_header_len = RFC1483LLC_LEN; | |
555 | dev->mtu = RFC1626_MTU; | |
556 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ | |
557 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
558 | /* length. tx_queue_len is only used for the default case, */ | |
559 | /* without any more elaborate queuing. 100 is a reasonable */ | |
560 | /* compromise between decent burst-tolerance and protection */ | |
561 | /* against memory hogs. */ | |
562 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; | |
563 | } | |
564 | ||
565 | static int clip_create(int number) | |
566 | { | |
567 | struct net_device *dev; | |
568 | struct clip_priv *clip_priv; | |
569 | int error; | |
570 | ||
571 | if (number != -1) { | |
572 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
573 | if (PRIV(dev)->number == number) | |
574 | return -EEXIST; | |
575 | } else { | |
576 | number = 0; | |
577 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
578 | if (PRIV(dev)->number >= number) | |
579 | number = PRIV(dev)->number + 1; | |
580 | } | |
581 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
582 | if (!dev) | |
583 | return -ENOMEM; | |
584 | clip_priv = PRIV(dev); | |
585 | sprintf(dev->name, "atm%d", number); | |
586 | spin_lock_init(&clip_priv->xoff_lock); | |
587 | clip_priv->number = number; | |
588 | error = register_netdev(dev); | |
589 | if (error) { | |
590 | free_netdev(dev); | |
591 | return error; | |
592 | } | |
593 | clip_priv->next = clip_devs; | |
594 | clip_devs = dev; | |
595 | pr_debug("registered (net:%s)\n", dev->name); | |
596 | return number; | |
597 | } | |
598 | ||
599 | static int clip_device_event(struct notifier_block *this, unsigned long event, | |
600 | void *arg) | |
601 | { | |
602 | struct net_device *dev = arg; | |
603 | ||
604 | if (!net_eq(dev_net(dev), &init_net)) | |
605 | return NOTIFY_DONE; | |
606 | ||
607 | if (event == NETDEV_UNREGISTER) { | |
608 | neigh_ifdown(&clip_tbl, dev); | |
609 | return NOTIFY_DONE; | |
610 | } | |
611 | ||
612 | /* ignore non-CLIP devices */ | |
613 | if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) | |
614 | return NOTIFY_DONE; | |
615 | ||
616 | switch (event) { | |
617 | case NETDEV_UP: | |
618 | pr_debug("NETDEV_UP\n"); | |
619 | to_atmarpd(act_up, PRIV(dev)->number, 0); | |
620 | break; | |
621 | case NETDEV_GOING_DOWN: | |
622 | pr_debug("NETDEV_DOWN\n"); | |
623 | to_atmarpd(act_down, PRIV(dev)->number, 0); | |
624 | break; | |
625 | case NETDEV_CHANGE: | |
626 | case NETDEV_CHANGEMTU: | |
627 | pr_debug("NETDEV_CHANGE*\n"); | |
628 | to_atmarpd(act_change, PRIV(dev)->number, 0); | |
629 | break; | |
630 | } | |
631 | return NOTIFY_DONE; | |
632 | } | |
633 | ||
634 | static int clip_inet_event(struct notifier_block *this, unsigned long event, | |
635 | void *ifa) | |
636 | { | |
637 | struct in_device *in_dev; | |
638 | ||
639 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; | |
640 | /* | |
641 | * Transitions are of the down-change-up type, so it's sufficient to | |
642 | * handle the change on up. | |
643 | */ | |
644 | if (event != NETDEV_UP) | |
645 | return NOTIFY_DONE; | |
646 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
647 | } | |
648 | ||
649 | static struct notifier_block clip_dev_notifier = { | |
650 | .notifier_call = clip_device_event, | |
651 | }; | |
652 | ||
653 | ||
654 | ||
655 | static struct notifier_block clip_inet_notifier = { | |
656 | .notifier_call = clip_inet_event, | |
657 | }; | |
658 | ||
659 | ||
660 | ||
661 | static void atmarpd_close(struct atm_vcc *vcc) | |
662 | { | |
663 | pr_debug("\n"); | |
664 | ||
665 | rtnl_lock(); | |
666 | atmarpd = NULL; | |
667 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); | |
668 | rtnl_unlock(); | |
669 | ||
670 | pr_debug("(done)\n"); | |
671 | module_put(THIS_MODULE); | |
672 | } | |
673 | ||
674 | static struct atmdev_ops atmarpd_dev_ops = { | |
675 | .close = atmarpd_close | |
676 | }; | |
677 | ||
678 | ||
679 | static struct atm_dev atmarpd_dev = { | |
680 | .ops = &atmarpd_dev_ops, | |
681 | .type = "arpd", | |
682 | .number = 999, | |
683 | .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) | |
684 | }; | |
685 | ||
686 | ||
687 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
688 | { | |
689 | rtnl_lock(); | |
690 | if (atmarpd) { | |
691 | rtnl_unlock(); | |
692 | return -EADDRINUSE; | |
693 | } | |
694 | ||
695 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); | |
696 | ||
697 | atmarpd = vcc; | |
698 | set_bit(ATM_VF_META, &vcc->flags); | |
699 | set_bit(ATM_VF_READY, &vcc->flags); | |
700 | /* allow replies and avoid getting closed if signaling dies */ | |
701 | vcc->dev = &atmarpd_dev; | |
702 | vcc_insert_socket(sk_atm(vcc)); | |
703 | vcc->push = NULL; | |
704 | vcc->pop = NULL; /* crash */ | |
705 | vcc->push_oam = NULL; /* crash */ | |
706 | rtnl_unlock(); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
711 | { | |
712 | struct atm_vcc *vcc = ATM_SD(sock); | |
713 | int err = 0; | |
714 | ||
715 | switch (cmd) { | |
716 | case SIOCMKCLIP: | |
717 | case ATMARPD_CTRL: | |
718 | case ATMARP_MKIP: | |
719 | case ATMARP_SETENTRY: | |
720 | case ATMARP_ENCAP: | |
721 | if (!capable(CAP_NET_ADMIN)) | |
722 | return -EPERM; | |
723 | break; | |
724 | default: | |
725 | return -ENOIOCTLCMD; | |
726 | } | |
727 | ||
728 | switch (cmd) { | |
729 | case SIOCMKCLIP: | |
730 | err = clip_create(arg); | |
731 | break; | |
732 | case ATMARPD_CTRL: | |
733 | err = atm_init_atmarp(vcc); | |
734 | if (!err) { | |
735 | sock->state = SS_CONNECTED; | |
736 | __module_get(THIS_MODULE); | |
737 | } | |
738 | break; | |
739 | case ATMARP_MKIP: | |
740 | err = clip_mkip(vcc, arg); | |
741 | break; | |
742 | case ATMARP_SETENTRY: | |
743 | err = clip_setentry(vcc, (__force __be32)arg); | |
744 | break; | |
745 | case ATMARP_ENCAP: | |
746 | err = clip_encap(vcc, arg); | |
747 | break; | |
748 | } | |
749 | return err; | |
750 | } | |
751 | ||
752 | static struct atm_ioctl clip_ioctl_ops = { | |
753 | .owner = THIS_MODULE, | |
754 | .ioctl = clip_ioctl, | |
755 | }; | |
756 | ||
757 | #ifdef CONFIG_PROC_FS | |
758 | ||
759 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
760 | { | |
761 | static int code[] = { 1, 2, 10, 6, 1, 0 }; | |
762 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
763 | ||
764 | if (*addr->sas_addr.pub) { | |
765 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
766 | if (*addr->sas_addr.prv) | |
767 | seq_putc(seq, '+'); | |
768 | } else if (!*addr->sas_addr.prv) { | |
769 | seq_printf(seq, "%s", "(none)"); | |
770 | return; | |
771 | } | |
772 | if (*addr->sas_addr.prv) { | |
773 | unsigned char *prv = addr->sas_addr.prv; | |
774 | int *fields; | |
775 | int i, j; | |
776 | ||
777 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
778 | for (i = 0; fields[i]; i++) { | |
779 | for (j = fields[i]; j; j--) | |
780 | seq_printf(seq, "%02X", *prv++); | |
781 | if (fields[i + 1]) | |
782 | seq_putc(seq, '.'); | |
783 | } | |
784 | } | |
785 | } | |
786 | ||
787 | /* This means the neighbour entry has no attached VCC objects. */ | |
788 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
789 | ||
790 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
791 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
792 | { | |
793 | unsigned long exp; | |
794 | char buf[17]; | |
795 | int svc, llc, off; | |
796 | ||
797 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
798 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
799 | ||
800 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); | |
801 | ||
802 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
803 | exp = entry->neigh->used; | |
804 | else | |
805 | exp = clip_vcc->last_use; | |
806 | ||
807 | exp = (jiffies - exp) / HZ; | |
808 | ||
809 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
810 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); | |
811 | ||
812 | off = scnprintf(buf, sizeof(buf) - 1, "%pI4", | |
813 | &entry->ip); | |
814 | while (off < 16) | |
815 | buf[off++] = ' '; | |
816 | buf[off] = '\0'; | |
817 | seq_printf(seq, "%s", buf); | |
818 | ||
819 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
820 | if (time_before(jiffies, entry->expires)) | |
821 | seq_printf(seq, "(resolving)\n"); | |
822 | else | |
823 | seq_printf(seq, "(expired, ref %d)\n", | |
824 | atomic_read(&entry->neigh->refcnt)); | |
825 | } else if (!svc) { | |
826 | seq_printf(seq, "%d.%d.%d\n", | |
827 | clip_vcc->vcc->dev->number, | |
828 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); | |
829 | } else { | |
830 | svc_addr(seq, &clip_vcc->vcc->remote); | |
831 | seq_putc(seq, '\n'); | |
832 | } | |
833 | } | |
834 | ||
835 | struct clip_seq_state { | |
836 | /* This member must be first. */ | |
837 | struct neigh_seq_state ns; | |
838 | ||
839 | /* Local to clip specific iteration. */ | |
840 | struct clip_vcc *vcc; | |
841 | }; | |
842 | ||
843 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
844 | struct clip_vcc *curr) | |
845 | { | |
846 | if (!curr) { | |
847 | curr = e->vccs; | |
848 | if (!curr) | |
849 | return SEQ_NO_VCC_TOKEN; | |
850 | return curr; | |
851 | } | |
852 | if (curr == SEQ_NO_VCC_TOKEN) | |
853 | return NULL; | |
854 | ||
855 | curr = curr->next; | |
856 | ||
857 | return curr; | |
858 | } | |
859 | ||
860 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
861 | struct atmarp_entry *e, loff_t * pos) | |
862 | { | |
863 | struct clip_vcc *vcc = state->vcc; | |
864 | ||
865 | vcc = clip_seq_next_vcc(e, vcc); | |
866 | if (vcc && pos != NULL) { | |
867 | while (*pos) { | |
868 | vcc = clip_seq_next_vcc(e, vcc); | |
869 | if (!vcc) | |
870 | break; | |
871 | --(*pos); | |
872 | } | |
873 | } | |
874 | state->vcc = vcc; | |
875 | ||
876 | return vcc; | |
877 | } | |
878 | ||
879 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, | |
880 | struct neighbour *n, loff_t * pos) | |
881 | { | |
882 | struct clip_seq_state *state = (struct clip_seq_state *)_state; | |
883 | ||
884 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
885 | } | |
886 | ||
887 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) | |
888 | { | |
889 | struct clip_seq_state *state = seq->private; | |
890 | state->ns.neigh_sub_iter = clip_seq_sub_iter; | |
891 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); | |
892 | } | |
893 | ||
894 | static int clip_seq_show(struct seq_file *seq, void *v) | |
895 | { | |
896 | static char atm_arp_banner[] = | |
897 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
898 | ||
899 | if (v == SEQ_START_TOKEN) { | |
900 | seq_puts(seq, atm_arp_banner); | |
901 | } else { | |
902 | struct clip_seq_state *state = seq->private; | |
903 | struct neighbour *n = v; | |
904 | struct clip_vcc *vcc = state->vcc; | |
905 | ||
906 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
907 | } | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static const struct seq_operations arp_seq_ops = { | |
912 | .start = clip_seq_start, | |
913 | .next = neigh_seq_next, | |
914 | .stop = neigh_seq_stop, | |
915 | .show = clip_seq_show, | |
916 | }; | |
917 | ||
918 | static int arp_seq_open(struct inode *inode, struct file *file) | |
919 | { | |
920 | return seq_open_net(inode, file, &arp_seq_ops, | |
921 | sizeof(struct clip_seq_state)); | |
922 | } | |
923 | ||
924 | static const struct file_operations arp_seq_fops = { | |
925 | .open = arp_seq_open, | |
926 | .read = seq_read, | |
927 | .llseek = seq_lseek, | |
928 | .release = seq_release_net, | |
929 | .owner = THIS_MODULE | |
930 | }; | |
931 | #endif | |
932 | ||
933 | static void atm_clip_exit_noproc(void); | |
934 | ||
935 | static int __init atm_clip_init(void) | |
936 | { | |
937 | neigh_table_init_no_netlink(&clip_tbl); | |
938 | ||
939 | clip_tbl_hook = &clip_tbl; | |
940 | register_atm_ioctl(&clip_ioctl_ops); | |
941 | register_netdevice_notifier(&clip_dev_notifier); | |
942 | register_inetaddr_notifier(&clip_inet_notifier); | |
943 | ||
944 | setup_timer(&idle_timer, idle_timer_check, 0); | |
945 | ||
946 | #ifdef CONFIG_PROC_FS | |
947 | { | |
948 | struct proc_dir_entry *p; | |
949 | ||
950 | p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); | |
951 | if (!p) { | |
952 | pr_err("Unable to initialize /proc/net/atm/arp\n"); | |
953 | atm_clip_exit_noproc(); | |
954 | return -ENOMEM; | |
955 | } | |
956 | } | |
957 | #endif | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | static void atm_clip_exit_noproc(void) | |
963 | { | |
964 | struct net_device *dev, *next; | |
965 | ||
966 | unregister_inetaddr_notifier(&clip_inet_notifier); | |
967 | unregister_netdevice_notifier(&clip_dev_notifier); | |
968 | ||
969 | deregister_atm_ioctl(&clip_ioctl_ops); | |
970 | ||
971 | /* First, stop the idle timer, so it stops banging | |
972 | * on the table. | |
973 | */ | |
974 | del_timer_sync(&idle_timer); | |
975 | ||
976 | /* Next, purge the table, so that the device | |
977 | * unregister loop below does not hang due to | |
978 | * device references remaining in the table. | |
979 | */ | |
980 | neigh_ifdown(&clip_tbl, NULL); | |
981 | ||
982 | dev = clip_devs; | |
983 | while (dev) { | |
984 | next = PRIV(dev)->next; | |
985 | unregister_netdev(dev); | |
986 | free_netdev(dev); | |
987 | dev = next; | |
988 | } | |
989 | ||
990 | /* Now it is safe to fully shutdown whole table. */ | |
991 | neigh_table_clear(&clip_tbl); | |
992 | ||
993 | clip_tbl_hook = NULL; | |
994 | } | |
995 | ||
996 | static void __exit atm_clip_exit(void) | |
997 | { | |
998 | remove_proc_entry("arp", atm_proc_root); | |
999 | ||
1000 | atm_clip_exit_noproc(); | |
1001 | } | |
1002 | ||
1003 | module_init(atm_clip_init); | |
1004 | module_exit(atm_clip_exit); | |
1005 | MODULE_AUTHOR("Werner Almesberger"); | |
1006 | MODULE_DESCRIPTION("Classical/IP over ATM interface"); | |
1007 | MODULE_LICENSE("GPL"); |