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1 | /* net/atm/clip.c - RFC1577 Classical IP over ATM */ | |
2 | ||
3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ | |
4 | ||
5 | #include <linux/string.h> | |
6 | #include <linux/errno.h> | |
7 | #include <linux/kernel.h> /* for UINT_MAX */ | |
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/netdevice.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/wait.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/if_arp.h> /* for some manifest constants */ | |
15 | #include <linux/notifier.h> | |
16 | #include <linux/atm.h> | |
17 | #include <linux/atmdev.h> | |
18 | #include <linux/atmclip.h> | |
19 | #include <linux/atmarp.h> | |
20 | #include <linux/capability.h> | |
21 | #include <linux/ip.h> /* for net/route.h */ | |
22 | #include <linux/in.h> /* for struct sockaddr_in */ | |
23 | #include <linux/if.h> /* for IFF_UP */ | |
24 | #include <linux/inetdevice.h> | |
25 | #include <linux/bitops.h> | |
26 | #include <linux/poison.h> | |
27 | #include <linux/proc_fs.h> | |
28 | #include <linux/seq_file.h> | |
29 | #include <linux/rcupdate.h> | |
30 | #include <linux/jhash.h> | |
31 | #include <net/route.h> /* for struct rtable and routing */ | |
32 | #include <net/icmp.h> /* icmp_send */ | |
33 | #include <asm/param.h> /* for HZ */ | |
34 | #include <asm/byteorder.h> /* for htons etc. */ | |
35 | #include <asm/system.h> /* save/restore_flags */ | |
36 | #include <asm/uaccess.h> | |
37 | #include <asm/atomic.h> | |
38 | ||
39 | #include "common.h" | |
40 | #include "resources.h" | |
41 | #include <net/atmclip.h> | |
42 | ||
43 | ||
44 | #if 0 | |
45 | #define DPRINTK(format,args...) printk(format,##args) | |
46 | #else | |
47 | #define DPRINTK(format,args...) | |
48 | #endif | |
49 | ||
50 | ||
51 | static struct net_device *clip_devs; | |
52 | static struct atm_vcc *atmarpd; | |
53 | static struct neigh_table clip_tbl; | |
54 | static struct timer_list idle_timer; | |
55 | ||
56 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) | |
57 | { | |
58 | struct sock *sk; | |
59 | struct atmarp_ctrl *ctrl; | |
60 | struct sk_buff *skb; | |
61 | ||
62 | DPRINTK("to_atmarpd(%d)\n", type); | |
63 | if (!atmarpd) | |
64 | return -EUNATCH; | |
65 | skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); | |
66 | if (!skb) | |
67 | return -ENOMEM; | |
68 | ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); | |
69 | ctrl->type = type; | |
70 | ctrl->itf_num = itf; | |
71 | ctrl->ip = ip; | |
72 | atm_force_charge(atmarpd, skb->truesize); | |
73 | ||
74 | sk = sk_atm(atmarpd); | |
75 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
76 | sk->sk_data_ready(sk, skb->len); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) | |
81 | { | |
82 | DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, | |
83 | entry->neigh); | |
84 | clip_vcc->entry = entry; | |
85 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ | |
86 | clip_vcc->next = entry->vccs; | |
87 | entry->vccs = clip_vcc; | |
88 | entry->neigh->used = jiffies; | |
89 | } | |
90 | ||
91 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) | |
92 | { | |
93 | struct atmarp_entry *entry = clip_vcc->entry; | |
94 | struct clip_vcc **walk; | |
95 | ||
96 | if (!entry) { | |
97 | printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); | |
98 | return; | |
99 | } | |
100 | netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ | |
101 | entry->neigh->used = jiffies; | |
102 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) | |
103 | if (*walk == clip_vcc) { | |
104 | int error; | |
105 | ||
106 | *walk = clip_vcc->next; /* atomic */ | |
107 | clip_vcc->entry = NULL; | |
108 | if (clip_vcc->xoff) | |
109 | netif_wake_queue(entry->neigh->dev); | |
110 | if (entry->vccs) | |
111 | goto out; | |
112 | entry->expires = jiffies - 1; | |
113 | /* force resolution or expiration */ | |
114 | error = neigh_update(entry->neigh, NULL, NUD_NONE, | |
115 | NEIGH_UPDATE_F_ADMIN); | |
116 | if (error) | |
117 | printk(KERN_CRIT "unlink_clip_vcc: " | |
118 | "neigh_update failed with %d\n", error); | |
119 | goto out; | |
120 | } | |
121 | printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " | |
122 | "0x%p)\n", entry, clip_vcc); | |
123 | out: | |
124 | netif_tx_unlock_bh(entry->neigh->dev); | |
125 | } | |
126 | ||
127 | /* The neighbour entry n->lock is held. */ | |
128 | static int neigh_check_cb(struct neighbour *n) | |
129 | { | |
130 | struct atmarp_entry *entry = NEIGH2ENTRY(n); | |
131 | struct clip_vcc *cv; | |
132 | ||
133 | for (cv = entry->vccs; cv; cv = cv->next) { | |
134 | unsigned long exp = cv->last_use + cv->idle_timeout; | |
135 | ||
136 | if (cv->idle_timeout && time_after(jiffies, exp)) { | |
137 | DPRINTK("releasing vcc %p->%p of entry %p\n", | |
138 | cv, cv->vcc, entry); | |
139 | vcc_release_async(cv->vcc, -ETIMEDOUT); | |
140 | } | |
141 | } | |
142 | ||
143 | if (entry->vccs || time_before(jiffies, entry->expires)) | |
144 | return 0; | |
145 | ||
146 | if (atomic_read(&n->refcnt) > 1) { | |
147 | struct sk_buff *skb; | |
148 | ||
149 | DPRINTK("destruction postponed with ref %d\n", | |
150 | atomic_read(&n->refcnt)); | |
151 | ||
152 | while ((skb = skb_dequeue(&n->arp_queue)) != NULL) | |
153 | dev_kfree_skb(skb); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | DPRINTK("expired neigh %p\n", n); | |
159 | return 1; | |
160 | } | |
161 | ||
162 | static void idle_timer_check(unsigned long dummy) | |
163 | { | |
164 | write_lock(&clip_tbl.lock); | |
165 | __neigh_for_each_release(&clip_tbl, neigh_check_cb); | |
166 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); | |
167 | write_unlock(&clip_tbl.lock); | |
168 | } | |
169 | ||
170 | static int clip_arp_rcv(struct sk_buff *skb) | |
171 | { | |
172 | struct atm_vcc *vcc; | |
173 | ||
174 | DPRINTK("clip_arp_rcv\n"); | |
175 | vcc = ATM_SKB(skb)->vcc; | |
176 | if (!vcc || !atm_charge(vcc, skb->truesize)) { | |
177 | dev_kfree_skb_any(skb); | |
178 | return 0; | |
179 | } | |
180 | DPRINTK("pushing to %p\n", vcc); | |
181 | DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push); | |
182 | CLIP_VCC(vcc)->old_push(vcc, skb); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static const unsigned char llc_oui[] = { | |
187 | 0xaa, /* DSAP: non-ISO */ | |
188 | 0xaa, /* SSAP: non-ISO */ | |
189 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
190 | 0x00, /* OUI: EtherType */ | |
191 | 0x00, | |
192 | 0x00 | |
193 | }; | |
194 | ||
195 | static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) | |
196 | { | |
197 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
198 | ||
199 | DPRINTK("clip push\n"); | |
200 | if (!skb) { | |
201 | DPRINTK("removing VCC %p\n", clip_vcc); | |
202 | if (clip_vcc->entry) | |
203 | unlink_clip_vcc(clip_vcc); | |
204 | clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ | |
205 | kfree(clip_vcc); | |
206 | return; | |
207 | } | |
208 | atm_return(vcc, skb->truesize); | |
209 | skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; | |
210 | /* clip_vcc->entry == NULL if we don't have an IP address yet */ | |
211 | if (!skb->dev) { | |
212 | dev_kfree_skb_any(skb); | |
213 | return; | |
214 | } | |
215 | ATM_SKB(skb)->vcc = vcc; | |
216 | skb_reset_mac_header(skb); | |
217 | if (!clip_vcc->encap | |
218 | || skb->len < RFC1483LLC_LEN | |
219 | || memcmp(skb->data, llc_oui, sizeof (llc_oui))) | |
220 | skb->protocol = htons(ETH_P_IP); | |
221 | else { | |
222 | skb->protocol = ((__be16 *) skb->data)[3]; | |
223 | skb_pull(skb, RFC1483LLC_LEN); | |
224 | if (skb->protocol == htons(ETH_P_ARP)) { | |
225 | PRIV(skb->dev)->stats.rx_packets++; | |
226 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
227 | clip_arp_rcv(skb); | |
228 | return; | |
229 | } | |
230 | } | |
231 | clip_vcc->last_use = jiffies; | |
232 | PRIV(skb->dev)->stats.rx_packets++; | |
233 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
234 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
235 | netif_rx(skb); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that | |
240 | * clip_pop is atomic with respect to the critical section in clip_start_xmit. | |
241 | */ | |
242 | ||
243 | static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) | |
244 | { | |
245 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
246 | struct net_device *dev = skb->dev; | |
247 | int old; | |
248 | unsigned long flags; | |
249 | ||
250 | DPRINTK("clip_pop(vcc %p)\n", vcc); | |
251 | clip_vcc->old_pop(vcc, skb); | |
252 | /* skb->dev == NULL in outbound ARP packets */ | |
253 | if (!dev) | |
254 | return; | |
255 | spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); | |
256 | if (atm_may_send(vcc, 0)) { | |
257 | old = xchg(&clip_vcc->xoff, 0); | |
258 | if (old) | |
259 | netif_wake_queue(dev); | |
260 | } | |
261 | spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); | |
262 | } | |
263 | ||
264 | static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
265 | { | |
266 | DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); | |
267 | to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); | |
268 | } | |
269 | ||
270 | static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) | |
271 | { | |
272 | #ifndef CONFIG_ATM_CLIP_NO_ICMP | |
273 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); | |
274 | #endif | |
275 | kfree_skb(skb); | |
276 | } | |
277 | ||
278 | static struct neigh_ops clip_neigh_ops = { | |
279 | .family = AF_INET, | |
280 | .solicit = clip_neigh_solicit, | |
281 | .error_report = clip_neigh_error, | |
282 | .output = dev_queue_xmit, | |
283 | .connected_output = dev_queue_xmit, | |
284 | .hh_output = dev_queue_xmit, | |
285 | .queue_xmit = dev_queue_xmit, | |
286 | }; | |
287 | ||
288 | static int clip_constructor(struct neighbour *neigh) | |
289 | { | |
290 | struct atmarp_entry *entry = NEIGH2ENTRY(neigh); | |
291 | struct net_device *dev = neigh->dev; | |
292 | struct in_device *in_dev; | |
293 | struct neigh_parms *parms; | |
294 | ||
295 | DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry); | |
296 | neigh->type = inet_addr_type(entry->ip); | |
297 | if (neigh->type != RTN_UNICAST) | |
298 | return -EINVAL; | |
299 | ||
300 | rcu_read_lock(); | |
301 | in_dev = __in_dev_get_rcu(dev); | |
302 | if (!in_dev) { | |
303 | rcu_read_unlock(); | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | parms = in_dev->arp_parms; | |
308 | __neigh_parms_put(neigh->parms); | |
309 | neigh->parms = neigh_parms_clone(parms); | |
310 | rcu_read_unlock(); | |
311 | ||
312 | neigh->ops = &clip_neigh_ops; | |
313 | neigh->output = neigh->nud_state & NUD_VALID ? | |
314 | neigh->ops->connected_output : neigh->ops->output; | |
315 | entry->neigh = neigh; | |
316 | entry->vccs = NULL; | |
317 | entry->expires = jiffies - 1; | |
318 | return 0; | |
319 | } | |
320 | ||
321 | static u32 clip_hash(const void *pkey, const struct net_device *dev) | |
322 | { | |
323 | return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); | |
324 | } | |
325 | ||
326 | static struct neigh_table clip_tbl = { | |
327 | .family = AF_INET, | |
328 | .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), | |
329 | .key_len = 4, | |
330 | .hash = clip_hash, | |
331 | .constructor = clip_constructor, | |
332 | .id = "clip_arp_cache", | |
333 | ||
334 | /* parameters are copied from ARP ... */ | |
335 | .parms = { | |
336 | .tbl = &clip_tbl, | |
337 | .base_reachable_time = 30 * HZ, | |
338 | .retrans_time = 1 * HZ, | |
339 | .gc_staletime = 60 * HZ, | |
340 | .reachable_time = 30 * HZ, | |
341 | .delay_probe_time = 5 * HZ, | |
342 | .queue_len = 3, | |
343 | .ucast_probes = 3, | |
344 | .mcast_probes = 3, | |
345 | .anycast_delay = 1 * HZ, | |
346 | .proxy_delay = (8 * HZ) / 10, | |
347 | .proxy_qlen = 64, | |
348 | .locktime = 1 * HZ, | |
349 | }, | |
350 | .gc_interval = 30 * HZ, | |
351 | .gc_thresh1 = 128, | |
352 | .gc_thresh2 = 512, | |
353 | .gc_thresh3 = 1024, | |
354 | }; | |
355 | ||
356 | /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ | |
357 | ||
358 | /* | |
359 | * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means | |
360 | * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, | |
361 | * don't increment the usage count. This is used to create entries in | |
362 | * clip_setentry. | |
363 | */ | |
364 | ||
365 | static int clip_encap(struct atm_vcc *vcc, int mode) | |
366 | { | |
367 | CLIP_VCC(vcc)->encap = mode; | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
372 | { | |
373 | struct clip_priv *clip_priv = PRIV(dev); | |
374 | struct atmarp_entry *entry; | |
375 | struct atm_vcc *vcc; | |
376 | int old; | |
377 | unsigned long flags; | |
378 | ||
379 | DPRINTK("clip_start_xmit (skb %p)\n", skb); | |
380 | if (!skb->dst) { | |
381 | printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); | |
382 | dev_kfree_skb(skb); | |
383 | clip_priv->stats.tx_dropped++; | |
384 | return 0; | |
385 | } | |
386 | if (!skb->dst->neighbour) { | |
387 | #if 0 | |
388 | skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); | |
389 | if (!skb->dst->neighbour) { | |
390 | dev_kfree_skb(skb); /* lost that one */ | |
391 | clip_priv->stats.tx_dropped++; | |
392 | return 0; | |
393 | } | |
394 | #endif | |
395 | printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); | |
396 | dev_kfree_skb(skb); | |
397 | clip_priv->stats.tx_dropped++; | |
398 | return 0; | |
399 | } | |
400 | entry = NEIGH2ENTRY(skb->dst->neighbour); | |
401 | if (!entry->vccs) { | |
402 | if (time_after(jiffies, entry->expires)) { | |
403 | /* should be resolved */ | |
404 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; | |
405 | to_atmarpd(act_need, PRIV(dev)->number, entry->ip); | |
406 | } | |
407 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) | |
408 | skb_queue_tail(&entry->neigh->arp_queue, skb); | |
409 | else { | |
410 | dev_kfree_skb(skb); | |
411 | clip_priv->stats.tx_dropped++; | |
412 | } | |
413 | return 0; | |
414 | } | |
415 | DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs); | |
416 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; | |
417 | DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); | |
418 | if (entry->vccs->encap) { | |
419 | void *here; | |
420 | ||
421 | here = skb_push(skb, RFC1483LLC_LEN); | |
422 | memcpy(here, llc_oui, sizeof(llc_oui)); | |
423 | ((__be16 *) here)[3] = skb->protocol; | |
424 | } | |
425 | atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); | |
426 | ATM_SKB(skb)->atm_options = vcc->atm_options; | |
427 | entry->vccs->last_use = jiffies; | |
428 | DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); | |
429 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ | |
430 | if (old) { | |
431 | printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); | |
432 | return 0; | |
433 | } | |
434 | clip_priv->stats.tx_packets++; | |
435 | clip_priv->stats.tx_bytes += skb->len; | |
436 | vcc->send(vcc, skb); | |
437 | if (atm_may_send(vcc, 0)) { | |
438 | entry->vccs->xoff = 0; | |
439 | return 0; | |
440 | } | |
441 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); | |
442 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ | |
443 | barrier(); | |
444 | if (!entry->vccs->xoff) | |
445 | netif_start_queue(dev); | |
446 | /* Oh, we just raced with clip_pop. netif_start_queue should be | |
447 | good enough, because nothing should really be asleep because | |
448 | of the brief netif_stop_queue. If this isn't true or if it | |
449 | changes, use netif_wake_queue instead. */ | |
450 | spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static struct net_device_stats *clip_get_stats(struct net_device *dev) | |
455 | { | |
456 | return &PRIV(dev)->stats; | |
457 | } | |
458 | ||
459 | static int clip_mkip(struct atm_vcc *vcc, int timeout) | |
460 | { | |
461 | struct clip_vcc *clip_vcc; | |
462 | struct sk_buff *skb; | |
463 | struct sk_buff_head *rq; | |
464 | unsigned long flags; | |
465 | ||
466 | if (!vcc->push) | |
467 | return -EBADFD; | |
468 | clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); | |
469 | if (!clip_vcc) | |
470 | return -ENOMEM; | |
471 | DPRINTK("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc); | |
472 | clip_vcc->vcc = vcc; | |
473 | vcc->user_back = clip_vcc; | |
474 | set_bit(ATM_VF_IS_CLIP, &vcc->flags); | |
475 | clip_vcc->entry = NULL; | |
476 | clip_vcc->xoff = 0; | |
477 | clip_vcc->encap = 1; | |
478 | clip_vcc->last_use = jiffies; | |
479 | clip_vcc->idle_timeout = timeout * HZ; | |
480 | clip_vcc->old_push = vcc->push; | |
481 | clip_vcc->old_pop = vcc->pop; | |
482 | vcc->push = clip_push; | |
483 | vcc->pop = clip_pop; | |
484 | ||
485 | rq = &sk_atm(vcc)->sk_receive_queue; | |
486 | ||
487 | spin_lock_irqsave(&rq->lock, flags); | |
488 | if (skb_queue_empty(rq)) { | |
489 | skb = NULL; | |
490 | } else { | |
491 | /* NULL terminate the list. */ | |
492 | rq->prev->next = NULL; | |
493 | skb = rq->next; | |
494 | } | |
495 | rq->prev = rq->next = (struct sk_buff *)rq; | |
496 | rq->qlen = 0; | |
497 | spin_unlock_irqrestore(&rq->lock, flags); | |
498 | ||
499 | /* re-process everything received between connection setup and MKIP */ | |
500 | while (skb) { | |
501 | struct sk_buff *next = skb->next; | |
502 | ||
503 | skb->next = skb->prev = NULL; | |
504 | if (!clip_devs) { | |
505 | atm_return(vcc, skb->truesize); | |
506 | kfree_skb(skb); | |
507 | } else { | |
508 | unsigned int len = skb->len; | |
509 | ||
510 | skb_get(skb); | |
511 | clip_push(vcc, skb); | |
512 | PRIV(skb->dev)->stats.rx_packets--; | |
513 | PRIV(skb->dev)->stats.rx_bytes -= len; | |
514 | kfree_skb(skb); | |
515 | } | |
516 | ||
517 | skb = next; | |
518 | } | |
519 | return 0; | |
520 | } | |
521 | ||
522 | static int clip_setentry(struct atm_vcc *vcc, __be32 ip) | |
523 | { | |
524 | struct neighbour *neigh; | |
525 | struct atmarp_entry *entry; | |
526 | int error; | |
527 | struct clip_vcc *clip_vcc; | |
528 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; | |
529 | struct rtable *rt; | |
530 | ||
531 | if (vcc->push != clip_push) { | |
532 | printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); | |
533 | return -EBADF; | |
534 | } | |
535 | clip_vcc = CLIP_VCC(vcc); | |
536 | if (!ip) { | |
537 | if (!clip_vcc->entry) { | |
538 | printk(KERN_ERR "hiding hidden ATMARP entry\n"); | |
539 | return 0; | |
540 | } | |
541 | DPRINTK("setentry: remove\n"); | |
542 | unlink_clip_vcc(clip_vcc); | |
543 | return 0; | |
544 | } | |
545 | error = ip_route_output_key(&rt, &fl); | |
546 | if (error) | |
547 | return error; | |
548 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); | |
549 | ip_rt_put(rt); | |
550 | if (!neigh) | |
551 | return -ENOMEM; | |
552 | entry = NEIGH2ENTRY(neigh); | |
553 | if (entry != clip_vcc->entry) { | |
554 | if (!clip_vcc->entry) | |
555 | DPRINTK("setentry: add\n"); | |
556 | else { | |
557 | DPRINTK("setentry: update\n"); | |
558 | unlink_clip_vcc(clip_vcc); | |
559 | } | |
560 | link_vcc(clip_vcc, entry); | |
561 | } | |
562 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, | |
563 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
564 | neigh_release(neigh); | |
565 | return error; | |
566 | } | |
567 | ||
568 | static void clip_setup(struct net_device *dev) | |
569 | { | |
570 | dev->hard_start_xmit = clip_start_xmit; | |
571 | /* sg_xmit ... */ | |
572 | dev->get_stats = clip_get_stats; | |
573 | dev->type = ARPHRD_ATM; | |
574 | dev->hard_header_len = RFC1483LLC_LEN; | |
575 | dev->mtu = RFC1626_MTU; | |
576 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ | |
577 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
578 | /* length. tx_queue_len is only used for the default case, */ | |
579 | /* without any more elaborate queuing. 100 is a reasonable */ | |
580 | /* compromise between decent burst-tolerance and protection */ | |
581 | /* against memory hogs. */ | |
582 | } | |
583 | ||
584 | static int clip_create(int number) | |
585 | { | |
586 | struct net_device *dev; | |
587 | struct clip_priv *clip_priv; | |
588 | int error; | |
589 | ||
590 | if (number != -1) { | |
591 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
592 | if (PRIV(dev)->number == number) | |
593 | return -EEXIST; | |
594 | } else { | |
595 | number = 0; | |
596 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
597 | if (PRIV(dev)->number >= number) | |
598 | number = PRIV(dev)->number + 1; | |
599 | } | |
600 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
601 | if (!dev) | |
602 | return -ENOMEM; | |
603 | clip_priv = PRIV(dev); | |
604 | sprintf(dev->name, "atm%d", number); | |
605 | spin_lock_init(&clip_priv->xoff_lock); | |
606 | clip_priv->number = number; | |
607 | error = register_netdev(dev); | |
608 | if (error) { | |
609 | free_netdev(dev); | |
610 | return error; | |
611 | } | |
612 | clip_priv->next = clip_devs; | |
613 | clip_devs = dev; | |
614 | DPRINTK("registered (net:%s)\n", dev->name); | |
615 | return number; | |
616 | } | |
617 | ||
618 | static int clip_device_event(struct notifier_block *this, unsigned long event, | |
619 | void *arg) | |
620 | { | |
621 | struct net_device *dev = arg; | |
622 | ||
623 | if (event == NETDEV_UNREGISTER) { | |
624 | neigh_ifdown(&clip_tbl, dev); | |
625 | return NOTIFY_DONE; | |
626 | } | |
627 | ||
628 | /* ignore non-CLIP devices */ | |
629 | if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) | |
630 | return NOTIFY_DONE; | |
631 | ||
632 | switch (event) { | |
633 | case NETDEV_UP: | |
634 | DPRINTK("clip_device_event NETDEV_UP\n"); | |
635 | to_atmarpd(act_up, PRIV(dev)->number, 0); | |
636 | break; | |
637 | case NETDEV_GOING_DOWN: | |
638 | DPRINTK("clip_device_event NETDEV_DOWN\n"); | |
639 | to_atmarpd(act_down, PRIV(dev)->number, 0); | |
640 | break; | |
641 | case NETDEV_CHANGE: | |
642 | case NETDEV_CHANGEMTU: | |
643 | DPRINTK("clip_device_event NETDEV_CHANGE*\n"); | |
644 | to_atmarpd(act_change, PRIV(dev)->number, 0); | |
645 | break; | |
646 | } | |
647 | return NOTIFY_DONE; | |
648 | } | |
649 | ||
650 | static int clip_inet_event(struct notifier_block *this, unsigned long event, | |
651 | void *ifa) | |
652 | { | |
653 | struct in_device *in_dev; | |
654 | ||
655 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; | |
656 | if (!in_dev || !in_dev->dev) { | |
657 | printk(KERN_WARNING "clip_inet_event: no device\n"); | |
658 | return NOTIFY_DONE; | |
659 | } | |
660 | /* | |
661 | * Transitions are of the down-change-up type, so it's sufficient to | |
662 | * handle the change on up. | |
663 | */ | |
664 | if (event != NETDEV_UP) | |
665 | return NOTIFY_DONE; | |
666 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
667 | } | |
668 | ||
669 | ||
670 | static struct notifier_block clip_dev_notifier = { | |
671 | .notifier_call = clip_device_event, | |
672 | }; | |
673 | ||
674 | ||
675 | ||
676 | static struct notifier_block clip_inet_notifier = { | |
677 | .notifier_call = clip_inet_event, | |
678 | }; | |
679 | ||
680 | ||
681 | ||
682 | static void atmarpd_close(struct atm_vcc *vcc) | |
683 | { | |
684 | DPRINTK("atmarpd_close\n"); | |
685 | ||
686 | rtnl_lock(); | |
687 | atmarpd = NULL; | |
688 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); | |
689 | rtnl_unlock(); | |
690 | ||
691 | DPRINTK("(done)\n"); | |
692 | module_put(THIS_MODULE); | |
693 | } | |
694 | ||
695 | ||
696 | static struct atmdev_ops atmarpd_dev_ops = { | |
697 | .close = atmarpd_close | |
698 | }; | |
699 | ||
700 | ||
701 | static struct atm_dev atmarpd_dev = { | |
702 | .ops = &atmarpd_dev_ops, | |
703 | .type = "arpd", | |
704 | .number = 999, | |
705 | .lock = SPIN_LOCK_UNLOCKED | |
706 | }; | |
707 | ||
708 | ||
709 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
710 | { | |
711 | rtnl_lock(); | |
712 | if (atmarpd) { | |
713 | rtnl_unlock(); | |
714 | return -EADDRINUSE; | |
715 | } | |
716 | ||
717 | mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); | |
718 | ||
719 | atmarpd = vcc; | |
720 | set_bit(ATM_VF_META,&vcc->flags); | |
721 | set_bit(ATM_VF_READY,&vcc->flags); | |
722 | /* allow replies and avoid getting closed if signaling dies */ | |
723 | vcc->dev = &atmarpd_dev; | |
724 | vcc_insert_socket(sk_atm(vcc)); | |
725 | vcc->push = NULL; | |
726 | vcc->pop = NULL; /* crash */ | |
727 | vcc->push_oam = NULL; /* crash */ | |
728 | rtnl_unlock(); | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
733 | { | |
734 | struct atm_vcc *vcc = ATM_SD(sock); | |
735 | int err = 0; | |
736 | ||
737 | switch (cmd) { | |
738 | case SIOCMKCLIP: | |
739 | case ATMARPD_CTRL: | |
740 | case ATMARP_MKIP: | |
741 | case ATMARP_SETENTRY: | |
742 | case ATMARP_ENCAP: | |
743 | if (!capable(CAP_NET_ADMIN)) | |
744 | return -EPERM; | |
745 | break; | |
746 | default: | |
747 | return -ENOIOCTLCMD; | |
748 | } | |
749 | ||
750 | switch (cmd) { | |
751 | case SIOCMKCLIP: | |
752 | err = clip_create(arg); | |
753 | break; | |
754 | case ATMARPD_CTRL: | |
755 | err = atm_init_atmarp(vcc); | |
756 | if (!err) { | |
757 | sock->state = SS_CONNECTED; | |
758 | __module_get(THIS_MODULE); | |
759 | } | |
760 | break; | |
761 | case ATMARP_MKIP: | |
762 | err = clip_mkip(vcc, arg); | |
763 | break; | |
764 | case ATMARP_SETENTRY: | |
765 | err = clip_setentry(vcc, (__force __be32)arg); | |
766 | break; | |
767 | case ATMARP_ENCAP: | |
768 | err = clip_encap(vcc, arg); | |
769 | break; | |
770 | } | |
771 | return err; | |
772 | } | |
773 | ||
774 | static struct atm_ioctl clip_ioctl_ops = { | |
775 | .owner = THIS_MODULE, | |
776 | .ioctl = clip_ioctl, | |
777 | }; | |
778 | ||
779 | #ifdef CONFIG_PROC_FS | |
780 | ||
781 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
782 | { | |
783 | static int code[] = { 1, 2, 10, 6, 1, 0 }; | |
784 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
785 | ||
786 | if (*addr->sas_addr.pub) { | |
787 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
788 | if (*addr->sas_addr.prv) | |
789 | seq_putc(seq, '+'); | |
790 | } else if (!*addr->sas_addr.prv) { | |
791 | seq_printf(seq, "%s", "(none)"); | |
792 | return; | |
793 | } | |
794 | if (*addr->sas_addr.prv) { | |
795 | unsigned char *prv = addr->sas_addr.prv; | |
796 | int *fields; | |
797 | int i, j; | |
798 | ||
799 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
800 | for (i = 0; fields[i]; i++) { | |
801 | for (j = fields[i]; j; j--) | |
802 | seq_printf(seq, "%02X", *prv++); | |
803 | if (fields[i + 1]) | |
804 | seq_putc(seq, '.'); | |
805 | } | |
806 | } | |
807 | } | |
808 | ||
809 | /* This means the neighbour entry has no attached VCC objects. */ | |
810 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
811 | ||
812 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
813 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
814 | { | |
815 | unsigned long exp; | |
816 | char buf[17]; | |
817 | int svc, llc, off; | |
818 | ||
819 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
820 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
821 | ||
822 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); | |
823 | ||
824 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
825 | exp = entry->neigh->used; | |
826 | else | |
827 | exp = clip_vcc->last_use; | |
828 | ||
829 | exp = (jiffies - exp) / HZ; | |
830 | ||
831 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
832 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); | |
833 | ||
834 | off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", | |
835 | NIPQUAD(entry->ip)); | |
836 | while (off < 16) | |
837 | buf[off++] = ' '; | |
838 | buf[off] = '\0'; | |
839 | seq_printf(seq, "%s", buf); | |
840 | ||
841 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
842 | if (time_before(jiffies, entry->expires)) | |
843 | seq_printf(seq, "(resolving)\n"); | |
844 | else | |
845 | seq_printf(seq, "(expired, ref %d)\n", | |
846 | atomic_read(&entry->neigh->refcnt)); | |
847 | } else if (!svc) { | |
848 | seq_printf(seq, "%d.%d.%d\n", | |
849 | clip_vcc->vcc->dev->number, | |
850 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); | |
851 | } else { | |
852 | svc_addr(seq, &clip_vcc->vcc->remote); | |
853 | seq_putc(seq, '\n'); | |
854 | } | |
855 | } | |
856 | ||
857 | struct clip_seq_state { | |
858 | /* This member must be first. */ | |
859 | struct neigh_seq_state ns; | |
860 | ||
861 | /* Local to clip specific iteration. */ | |
862 | struct clip_vcc *vcc; | |
863 | }; | |
864 | ||
865 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
866 | struct clip_vcc *curr) | |
867 | { | |
868 | if (!curr) { | |
869 | curr = e->vccs; | |
870 | if (!curr) | |
871 | return SEQ_NO_VCC_TOKEN; | |
872 | return curr; | |
873 | } | |
874 | if (curr == SEQ_NO_VCC_TOKEN) | |
875 | return NULL; | |
876 | ||
877 | curr = curr->next; | |
878 | ||
879 | return curr; | |
880 | } | |
881 | ||
882 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
883 | struct atmarp_entry *e, loff_t * pos) | |
884 | { | |
885 | struct clip_vcc *vcc = state->vcc; | |
886 | ||
887 | vcc = clip_seq_next_vcc(e, vcc); | |
888 | if (vcc && pos != NULL) { | |
889 | while (*pos) { | |
890 | vcc = clip_seq_next_vcc(e, vcc); | |
891 | if (!vcc) | |
892 | break; | |
893 | --(*pos); | |
894 | } | |
895 | } | |
896 | state->vcc = vcc; | |
897 | ||
898 | return vcc; | |
899 | } | |
900 | ||
901 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, | |
902 | struct neighbour *n, loff_t * pos) | |
903 | { | |
904 | struct clip_seq_state *state = (struct clip_seq_state *)_state; | |
905 | ||
906 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
907 | } | |
908 | ||
909 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) | |
910 | { | |
911 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); | |
912 | } | |
913 | ||
914 | static int clip_seq_show(struct seq_file *seq, void *v) | |
915 | { | |
916 | static char atm_arp_banner[] = | |
917 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
918 | ||
919 | if (v == SEQ_START_TOKEN) { | |
920 | seq_puts(seq, atm_arp_banner); | |
921 | } else { | |
922 | struct clip_seq_state *state = seq->private; | |
923 | struct neighbour *n = v; | |
924 | struct clip_vcc *vcc = state->vcc; | |
925 | ||
926 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
927 | } | |
928 | return 0; | |
929 | } | |
930 | ||
931 | static struct seq_operations arp_seq_ops = { | |
932 | .start = clip_seq_start, | |
933 | .next = neigh_seq_next, | |
934 | .stop = neigh_seq_stop, | |
935 | .show = clip_seq_show, | |
936 | }; | |
937 | ||
938 | static int arp_seq_open(struct inode *inode, struct file *file) | |
939 | { | |
940 | struct clip_seq_state *state; | |
941 | struct seq_file *seq; | |
942 | int rc = -EAGAIN; | |
943 | ||
944 | state = kzalloc(sizeof(*state), GFP_KERNEL); | |
945 | if (!state) { | |
946 | rc = -ENOMEM; | |
947 | goto out_kfree; | |
948 | } | |
949 | state->ns.neigh_sub_iter = clip_seq_sub_iter; | |
950 | ||
951 | rc = seq_open(file, &arp_seq_ops); | |
952 | if (rc) | |
953 | goto out_kfree; | |
954 | ||
955 | seq = file->private_data; | |
956 | seq->private = state; | |
957 | out: | |
958 | return rc; | |
959 | ||
960 | out_kfree: | |
961 | kfree(state); | |
962 | goto out; | |
963 | } | |
964 | ||
965 | static const struct file_operations arp_seq_fops = { | |
966 | .open = arp_seq_open, | |
967 | .read = seq_read, | |
968 | .llseek = seq_lseek, | |
969 | .release = seq_release_private, | |
970 | .owner = THIS_MODULE | |
971 | }; | |
972 | #endif | |
973 | ||
974 | static int __init atm_clip_init(void) | |
975 | { | |
976 | neigh_table_init_no_netlink(&clip_tbl); | |
977 | ||
978 | clip_tbl_hook = &clip_tbl; | |
979 | register_atm_ioctl(&clip_ioctl_ops); | |
980 | register_netdevice_notifier(&clip_dev_notifier); | |
981 | register_inetaddr_notifier(&clip_inet_notifier); | |
982 | ||
983 | setup_timer(&idle_timer, idle_timer_check, 0); | |
984 | ||
985 | #ifdef CONFIG_PROC_FS | |
986 | { | |
987 | struct proc_dir_entry *p; | |
988 | ||
989 | p = create_proc_entry("arp", S_IRUGO, atm_proc_root); | |
990 | if (p) | |
991 | p->proc_fops = &arp_seq_fops; | |
992 | } | |
993 | #endif | |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | static void __exit atm_clip_exit(void) | |
999 | { | |
1000 | struct net_device *dev, *next; | |
1001 | ||
1002 | remove_proc_entry("arp", atm_proc_root); | |
1003 | ||
1004 | unregister_inetaddr_notifier(&clip_inet_notifier); | |
1005 | unregister_netdevice_notifier(&clip_dev_notifier); | |
1006 | ||
1007 | deregister_atm_ioctl(&clip_ioctl_ops); | |
1008 | ||
1009 | /* First, stop the idle timer, so it stops banging | |
1010 | * on the table. | |
1011 | */ | |
1012 | del_timer_sync(&idle_timer); | |
1013 | ||
1014 | /* Next, purge the table, so that the device | |
1015 | * unregister loop below does not hang due to | |
1016 | * device references remaining in the table. | |
1017 | */ | |
1018 | neigh_ifdown(&clip_tbl, NULL); | |
1019 | ||
1020 | dev = clip_devs; | |
1021 | while (dev) { | |
1022 | next = PRIV(dev)->next; | |
1023 | unregister_netdev(dev); | |
1024 | free_netdev(dev); | |
1025 | dev = next; | |
1026 | } | |
1027 | ||
1028 | /* Now it is safe to fully shutdown whole table. */ | |
1029 | neigh_table_clear(&clip_tbl); | |
1030 | ||
1031 | clip_tbl_hook = NULL; | |
1032 | } | |
1033 | ||
1034 | module_init(atm_clip_init); | |
1035 | module_exit(atm_clip_exit); | |
1036 | MODULE_AUTHOR("Werner Almesberger"); | |
1037 | MODULE_DESCRIPTION("Classical/IP over ATM interface"); | |
1038 | MODULE_LICENSE("GPL"); |