1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* net/atm/clip.c - RFC1577 Classical IP over ATM */ |
3 | |
4 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
5 | |
6 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
7 | |
8 | #include <linux/string.h> |
9 | #include <linux/errno.h> |
10 | #include <linux/kernel.h> /* for UINT_MAX */ |
11 | #include <linux/module.h> |
12 | #include <linux/init.h> |
13 | #include <linux/netdevice.h> |
14 | #include <linux/skbuff.h> |
15 | #include <linux/wait.h> |
16 | #include <linux/timer.h> |
17 | #include <linux/if_arp.h> /* for some manifest constants */ |
18 | #include <linux/notifier.h> |
19 | #include <linux/atm.h> |
20 | #include <linux/atmdev.h> |
21 | #include <linux/atmclip.h> |
22 | #include <linux/atmarp.h> |
23 | #include <linux/capability.h> |
24 | #include <linux/ip.h> /* for net/route.h */ |
25 | #include <linux/in.h> /* for struct sockaddr_in */ |
26 | #include <linux/if.h> /* for IFF_UP */ |
27 | #include <linux/inetdevice.h> |
28 | #include <linux/bitops.h> |
29 | #include <linux/poison.h> |
30 | #include <linux/proc_fs.h> |
31 | #include <linux/seq_file.h> |
32 | #include <linux/rcupdate.h> |
33 | #include <linux/jhash.h> |
34 | #include <linux/slab.h> |
35 | #include <net/route.h> /* for struct rtable and routing */ |
36 | #include <net/icmp.h> /* icmp_send */ |
37 | #include <net/arp.h> |
38 | #include <linux/param.h> /* for HZ */ |
39 | #include <linux/uaccess.h> |
40 | #include <asm/byteorder.h> /* for htons etc. */ |
41 | #include <linux/atomic.h> |
42 | |
43 | #include "common.h" |
44 | #include "resources.h" |
45 | #include <net/atmclip.h> |
46 | |
47 | static struct net_device *clip_devs; |
48 | static struct atm_vcc *atmarpd; |
49 | static struct timer_list idle_timer; |
50 | static const struct neigh_ops clip_neigh_ops; |
51 | |
52 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) |
53 | { |
54 | struct sock *sk; |
55 | struct atmarp_ctrl *ctrl; |
56 | struct sk_buff *skb; |
57 | |
58 | pr_debug("(%d)\n" , type); |
59 | if (!atmarpd) |
60 | return -EUNATCH; |
61 | skb = alloc_skb(size: sizeof(struct atmarp_ctrl), GFP_ATOMIC); |
62 | if (!skb) |
63 | return -ENOMEM; |
64 | ctrl = skb_put(skb, len: sizeof(struct atmarp_ctrl)); |
65 | ctrl->type = type; |
66 | ctrl->itf_num = itf; |
67 | ctrl->ip = ip; |
68 | atm_force_charge(vcc: atmarpd, truesize: skb->truesize); |
69 | |
70 | sk = sk_atm(vcc: atmarpd); |
71 | skb_queue_tail(list: &sk->sk_receive_queue, newsk: skb); |
72 | sk->sk_data_ready(sk); |
73 | return 0; |
74 | } |
75 | |
76 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
77 | { |
78 | pr_debug("%p to entry %p (neigh %p)\n" , clip_vcc, entry, entry->neigh); |
79 | clip_vcc->entry = entry; |
80 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
81 | clip_vcc->next = entry->vccs; |
82 | entry->vccs = clip_vcc; |
83 | entry->neigh->used = jiffies; |
84 | } |
85 | |
86 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
87 | { |
88 | struct atmarp_entry *entry = clip_vcc->entry; |
89 | struct clip_vcc **walk; |
90 | |
91 | if (!entry) { |
92 | pr_err("!clip_vcc->entry (clip_vcc %p)\n" , clip_vcc); |
93 | return; |
94 | } |
95 | netif_tx_lock_bh(dev: entry->neigh->dev); /* block clip_start_xmit() */ |
96 | entry->neigh->used = jiffies; |
97 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) |
98 | if (*walk == clip_vcc) { |
99 | int error; |
100 | |
101 | *walk = clip_vcc->next; /* atomic */ |
102 | clip_vcc->entry = NULL; |
103 | if (clip_vcc->xoff) |
104 | netif_wake_queue(dev: entry->neigh->dev); |
105 | if (entry->vccs) |
106 | goto out; |
107 | entry->expires = jiffies - 1; |
108 | /* force resolution or expiration */ |
109 | error = neigh_update(neigh: entry->neigh, NULL, NUD_NONE, |
110 | NEIGH_UPDATE_F_ADMIN, nlmsg_pid: 0); |
111 | if (error) |
112 | pr_err("neigh_update failed with %d\n" , error); |
113 | goto out; |
114 | } |
115 | pr_err("ATMARP: failed (entry %p, vcc 0x%p)\n" , entry, clip_vcc); |
116 | out: |
117 | netif_tx_unlock_bh(dev: entry->neigh->dev); |
118 | } |
119 | |
120 | /* The neighbour entry n->lock is held. */ |
121 | static int neigh_check_cb(struct neighbour *n) |
122 | { |
123 | struct atmarp_entry *entry = neighbour_priv(n); |
124 | struct clip_vcc *cv; |
125 | |
126 | if (n->ops != &clip_neigh_ops) |
127 | return 0; |
128 | for (cv = entry->vccs; cv; cv = cv->next) { |
129 | unsigned long exp = cv->last_use + cv->idle_timeout; |
130 | |
131 | if (cv->idle_timeout && time_after(jiffies, exp)) { |
132 | pr_debug("releasing vcc %p->%p of entry %p\n" , |
133 | cv, cv->vcc, entry); |
134 | vcc_release_async(vcc: cv->vcc, reply: -ETIMEDOUT); |
135 | } |
136 | } |
137 | |
138 | if (entry->vccs || time_before(jiffies, entry->expires)) |
139 | return 0; |
140 | |
141 | if (refcount_read(r: &n->refcnt) > 1) { |
142 | struct sk_buff *skb; |
143 | |
144 | pr_debug("destruction postponed with ref %d\n" , |
145 | refcount_read(&n->refcnt)); |
146 | |
147 | while ((skb = skb_dequeue(list: &n->arp_queue)) != NULL) |
148 | dev_kfree_skb(skb); |
149 | |
150 | return 0; |
151 | } |
152 | |
153 | pr_debug("expired neigh %p\n" , n); |
154 | return 1; |
155 | } |
156 | |
157 | static void idle_timer_check(struct timer_list *unused) |
158 | { |
159 | write_lock(&arp_tbl.lock); |
160 | __neigh_for_each_release(tbl: &arp_tbl, cb: neigh_check_cb); |
161 | mod_timer(timer: &idle_timer, expires: jiffies + CLIP_CHECK_INTERVAL * HZ); |
162 | write_unlock(&arp_tbl.lock); |
163 | } |
164 | |
165 | static int clip_arp_rcv(struct sk_buff *skb) |
166 | { |
167 | struct atm_vcc *vcc; |
168 | |
169 | pr_debug("\n" ); |
170 | vcc = ATM_SKB(skb)->vcc; |
171 | if (!vcc || !atm_charge(vcc, truesize: skb->truesize)) { |
172 | dev_kfree_skb_any(skb); |
173 | return 0; |
174 | } |
175 | pr_debug("pushing to %p\n" , vcc); |
176 | pr_debug("using %p\n" , CLIP_VCC(vcc)->old_push); |
177 | CLIP_VCC(vcc)->old_push(vcc, skb); |
178 | return 0; |
179 | } |
180 | |
181 | static const unsigned char llc_oui[] = { |
182 | 0xaa, /* DSAP: non-ISO */ |
183 | 0xaa, /* SSAP: non-ISO */ |
184 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ |
185 | 0x00, /* OUI: EtherType */ |
186 | 0x00, |
187 | 0x00 |
188 | }; |
189 | |
190 | static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) |
191 | { |
192 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
193 | |
194 | pr_debug("\n" ); |
195 | |
196 | if (!clip_devs) { |
197 | atm_return(vcc, truesize: skb->truesize); |
198 | kfree_skb(skb); |
199 | return; |
200 | } |
201 | |
202 | if (!skb) { |
203 | pr_debug("removing VCC %p\n" , clip_vcc); |
204 | if (clip_vcc->entry) |
205 | unlink_clip_vcc(clip_vcc); |
206 | clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ |
207 | kfree(objp: clip_vcc); |
208 | return; |
209 | } |
210 | atm_return(vcc, truesize: skb->truesize); |
211 | skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; |
212 | /* clip_vcc->entry == NULL if we don't have an IP address yet */ |
213 | if (!skb->dev) { |
214 | dev_kfree_skb_any(skb); |
215 | return; |
216 | } |
217 | ATM_SKB(skb)->vcc = vcc; |
218 | skb_reset_mac_header(skb); |
219 | if (!clip_vcc->encap || |
220 | skb->len < RFC1483LLC_LEN || |
221 | memcmp(p: skb->data, q: llc_oui, size: sizeof(llc_oui))) |
222 | skb->protocol = htons(ETH_P_IP); |
223 | else { |
224 | skb->protocol = ((__be16 *)skb->data)[3]; |
225 | skb_pull(skb, RFC1483LLC_LEN); |
226 | if (skb->protocol == htons(ETH_P_ARP)) { |
227 | skb->dev->stats.rx_packets++; |
228 | skb->dev->stats.rx_bytes += skb->len; |
229 | clip_arp_rcv(skb); |
230 | return; |
231 | } |
232 | } |
233 | clip_vcc->last_use = jiffies; |
234 | skb->dev->stats.rx_packets++; |
235 | skb->dev->stats.rx_bytes += skb->len; |
236 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
237 | netif_rx(skb); |
238 | } |
239 | |
240 | /* |
241 | * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that |
242 | * clip_pop is atomic with respect to the critical section in clip_start_xmit. |
243 | */ |
244 | |
245 | static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
246 | { |
247 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
248 | struct net_device *dev = skb->dev; |
249 | int old; |
250 | unsigned long flags; |
251 | |
252 | pr_debug("(vcc %p)\n" , vcc); |
253 | clip_vcc->old_pop(vcc, skb); |
254 | /* skb->dev == NULL in outbound ARP packets */ |
255 | if (!dev) |
256 | return; |
257 | spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); |
258 | if (atm_may_send(vcc, size: 0)) { |
259 | old = xchg(&clip_vcc->xoff, 0); |
260 | if (old) |
261 | netif_wake_queue(dev); |
262 | } |
263 | spin_unlock_irqrestore(lock: &PRIV(dev)->xoff_lock, flags); |
264 | } |
265 | |
266 | static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) |
267 | { |
268 | __be32 *ip = (__be32 *) neigh->primary_key; |
269 | |
270 | pr_debug("(neigh %p, skb %p)\n" , neigh, skb); |
271 | to_atmarpd(type: act_need, PRIV(neigh->dev)->number, ip: *ip); |
272 | } |
273 | |
274 | static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) |
275 | { |
276 | #ifndef CONFIG_ATM_CLIP_NO_ICMP |
277 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
278 | #endif |
279 | kfree_skb(skb); |
280 | } |
281 | |
282 | static const struct neigh_ops clip_neigh_ops = { |
283 | .family = AF_INET, |
284 | .solicit = clip_neigh_solicit, |
285 | .error_report = clip_neigh_error, |
286 | .output = neigh_direct_output, |
287 | .connected_output = neigh_direct_output, |
288 | }; |
289 | |
290 | static int clip_constructor(struct net_device *dev, struct neighbour *neigh) |
291 | { |
292 | struct atmarp_entry *entry = neighbour_priv(n: neigh); |
293 | |
294 | if (neigh->tbl->family != AF_INET) |
295 | return -EINVAL; |
296 | |
297 | if (neigh->type != RTN_UNICAST) |
298 | return -EINVAL; |
299 | |
300 | neigh->nud_state = NUD_NONE; |
301 | neigh->ops = &clip_neigh_ops; |
302 | neigh->output = neigh->ops->output; |
303 | entry->neigh = neigh; |
304 | entry->vccs = NULL; |
305 | entry->expires = jiffies - 1; |
306 | |
307 | return 0; |
308 | } |
309 | |
310 | /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ |
311 | |
312 | /* |
313 | * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means |
314 | * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, |
315 | * don't increment the usage count. This is used to create entries in |
316 | * clip_setentry. |
317 | */ |
318 | |
319 | static int clip_encap(struct atm_vcc *vcc, int mode) |
320 | { |
321 | if (!CLIP_VCC(vcc)) |
322 | return -EBADFD; |
323 | |
324 | CLIP_VCC(vcc)->encap = mode; |
325 | return 0; |
326 | } |
327 | |
328 | static netdev_tx_t clip_start_xmit(struct sk_buff *skb, |
329 | struct net_device *dev) |
330 | { |
331 | struct clip_priv *clip_priv = PRIV(dev); |
332 | struct dst_entry *dst = skb_dst(skb); |
333 | struct atmarp_entry *entry; |
334 | struct neighbour *n; |
335 | struct atm_vcc *vcc; |
336 | struct rtable *rt; |
337 | __be32 *daddr; |
338 | int old; |
339 | unsigned long flags; |
340 | |
341 | pr_debug("(skb %p)\n" , skb); |
342 | if (!dst) { |
343 | pr_err("skb_dst(skb) == NULL\n" ); |
344 | dev_kfree_skb(skb); |
345 | dev->stats.tx_dropped++; |
346 | return NETDEV_TX_OK; |
347 | } |
348 | rt = (struct rtable *) dst; |
349 | if (rt->rt_gw_family == AF_INET) |
350 | daddr = &rt->rt_gw4; |
351 | else |
352 | daddr = &ip_hdr(skb)->daddr; |
353 | n = dst_neigh_lookup(dst, daddr); |
354 | if (!n) { |
355 | pr_err("NO NEIGHBOUR !\n" ); |
356 | dev_kfree_skb(skb); |
357 | dev->stats.tx_dropped++; |
358 | return NETDEV_TX_OK; |
359 | } |
360 | entry = neighbour_priv(n); |
361 | if (!entry->vccs) { |
362 | if (time_after(jiffies, entry->expires)) { |
363 | /* should be resolved */ |
364 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
365 | to_atmarpd(type: act_need, PRIV(dev)->number, ip: *((__be32 *)n->primary_key)); |
366 | } |
367 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) |
368 | skb_queue_tail(list: &entry->neigh->arp_queue, newsk: skb); |
369 | else { |
370 | dev_kfree_skb(skb); |
371 | dev->stats.tx_dropped++; |
372 | } |
373 | goto out_release_neigh; |
374 | } |
375 | pr_debug("neigh %p, vccs %p\n" , entry, entry->vccs); |
376 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
377 | pr_debug("using neighbour %p, vcc %p\n" , n, vcc); |
378 | if (entry->vccs->encap) { |
379 | void *here; |
380 | |
381 | here = skb_push(skb, RFC1483LLC_LEN); |
382 | memcpy(here, llc_oui, sizeof(llc_oui)); |
383 | ((__be16 *) here)[3] = skb->protocol; |
384 | } |
385 | atm_account_tx(vcc, skb); |
386 | entry->vccs->last_use = jiffies; |
387 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n" , skb, vcc, vcc->dev); |
388 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ |
389 | if (old) { |
390 | pr_warn("XOFF->XOFF transition\n" ); |
391 | goto out_release_neigh; |
392 | } |
393 | dev->stats.tx_packets++; |
394 | dev->stats.tx_bytes += skb->len; |
395 | vcc->send(vcc, skb); |
396 | if (atm_may_send(vcc, size: 0)) { |
397 | entry->vccs->xoff = 0; |
398 | goto out_release_neigh; |
399 | } |
400 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
401 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ |
402 | barrier(); |
403 | if (!entry->vccs->xoff) |
404 | netif_start_queue(dev); |
405 | /* Oh, we just raced with clip_pop. netif_start_queue should be |
406 | good enough, because nothing should really be asleep because |
407 | of the brief netif_stop_queue. If this isn't true or if it |
408 | changes, use netif_wake_queue instead. */ |
409 | spin_unlock_irqrestore(lock: &clip_priv->xoff_lock, flags); |
410 | out_release_neigh: |
411 | neigh_release(neigh: n); |
412 | return NETDEV_TX_OK; |
413 | } |
414 | |
415 | static int clip_mkip(struct atm_vcc *vcc, int timeout) |
416 | { |
417 | struct clip_vcc *clip_vcc; |
418 | |
419 | if (!vcc->push) |
420 | return -EBADFD; |
421 | clip_vcc = kmalloc(size: sizeof(struct clip_vcc), GFP_KERNEL); |
422 | if (!clip_vcc) |
423 | return -ENOMEM; |
424 | pr_debug("%p vcc %p\n" , clip_vcc, vcc); |
425 | clip_vcc->vcc = vcc; |
426 | vcc->user_back = clip_vcc; |
427 | set_bit(nr: ATM_VF_IS_CLIP, addr: &vcc->flags); |
428 | clip_vcc->entry = NULL; |
429 | clip_vcc->xoff = 0; |
430 | clip_vcc->encap = 1; |
431 | clip_vcc->last_use = jiffies; |
432 | clip_vcc->idle_timeout = timeout * HZ; |
433 | clip_vcc->old_push = vcc->push; |
434 | clip_vcc->old_pop = vcc->pop; |
435 | vcc->push = clip_push; |
436 | vcc->pop = clip_pop; |
437 | |
438 | /* re-process everything received between connection setup and MKIP */ |
439 | vcc_process_recv_queue(vcc); |
440 | |
441 | return 0; |
442 | } |
443 | |
444 | static int clip_setentry(struct atm_vcc *vcc, __be32 ip) |
445 | { |
446 | struct neighbour *neigh; |
447 | struct atmarp_entry *entry; |
448 | int error; |
449 | struct clip_vcc *clip_vcc; |
450 | struct rtable *rt; |
451 | |
452 | if (vcc->push != clip_push) { |
453 | pr_warn("non-CLIP VCC\n" ); |
454 | return -EBADF; |
455 | } |
456 | clip_vcc = CLIP_VCC(vcc); |
457 | if (!ip) { |
458 | if (!clip_vcc->entry) { |
459 | pr_err("hiding hidden ATMARP entry\n" ); |
460 | return 0; |
461 | } |
462 | pr_debug("remove\n" ); |
463 | unlink_clip_vcc(clip_vcc); |
464 | return 0; |
465 | } |
466 | rt = ip_route_output(net: &init_net, daddr: ip, saddr: 0, tos: 1, oif: 0); |
467 | if (IS_ERR(ptr: rt)) |
468 | return PTR_ERR(ptr: rt); |
469 | neigh = __neigh_lookup(tbl: &arp_tbl, pkey: &ip, dev: rt->dst.dev, creat: 1); |
470 | ip_rt_put(rt); |
471 | if (!neigh) |
472 | return -ENOMEM; |
473 | entry = neighbour_priv(n: neigh); |
474 | if (entry != clip_vcc->entry) { |
475 | if (!clip_vcc->entry) |
476 | pr_debug("add\n" ); |
477 | else { |
478 | pr_debug("update\n" ); |
479 | unlink_clip_vcc(clip_vcc); |
480 | } |
481 | link_vcc(clip_vcc, entry); |
482 | } |
483 | error = neigh_update(neigh, lladdr: llc_oui, NUD_PERMANENT, |
484 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, nlmsg_pid: 0); |
485 | neigh_release(neigh); |
486 | return error; |
487 | } |
488 | |
489 | static const struct net_device_ops clip_netdev_ops = { |
490 | .ndo_start_xmit = clip_start_xmit, |
491 | .ndo_neigh_construct = clip_constructor, |
492 | }; |
493 | |
494 | static void clip_setup(struct net_device *dev) |
495 | { |
496 | dev->netdev_ops = &clip_netdev_ops; |
497 | dev->type = ARPHRD_ATM; |
498 | dev->neigh_priv_len = sizeof(struct atmarp_entry); |
499 | dev->hard_header_len = RFC1483LLC_LEN; |
500 | dev->mtu = RFC1626_MTU; |
501 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
502 | /* When using a "real" qdisc, the qdisc determines the queue */ |
503 | /* length. tx_queue_len is only used for the default case, */ |
504 | /* without any more elaborate queuing. 100 is a reasonable */ |
505 | /* compromise between decent burst-tolerance and protection */ |
506 | /* against memory hogs. */ |
507 | netif_keep_dst(dev); |
508 | } |
509 | |
510 | static int clip_create(int number) |
511 | { |
512 | struct net_device *dev; |
513 | struct clip_priv *clip_priv; |
514 | int error; |
515 | |
516 | if (number != -1) { |
517 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) |
518 | if (PRIV(dev)->number == number) |
519 | return -EEXIST; |
520 | } else { |
521 | number = 0; |
522 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) |
523 | if (PRIV(dev)->number >= number) |
524 | number = PRIV(dev)->number + 1; |
525 | } |
526 | dev = alloc_netdev(sizeof(struct clip_priv), "" , NET_NAME_UNKNOWN, |
527 | clip_setup); |
528 | if (!dev) |
529 | return -ENOMEM; |
530 | clip_priv = PRIV(dev); |
531 | sprintf(buf: dev->name, fmt: "atm%d" , number); |
532 | spin_lock_init(&clip_priv->xoff_lock); |
533 | clip_priv->number = number; |
534 | error = register_netdev(dev); |
535 | if (error) { |
536 | free_netdev(dev); |
537 | return error; |
538 | } |
539 | clip_priv->next = clip_devs; |
540 | clip_devs = dev; |
541 | pr_debug("registered (net:%s)\n" , dev->name); |
542 | return number; |
543 | } |
544 | |
545 | static int clip_device_event(struct notifier_block *this, unsigned long event, |
546 | void *ptr) |
547 | { |
548 | struct net_device *dev = netdev_notifier_info_to_dev(info: ptr); |
549 | |
550 | if (!net_eq(net1: dev_net(dev), net2: &init_net)) |
551 | return NOTIFY_DONE; |
552 | |
553 | if (event == NETDEV_UNREGISTER) |
554 | return NOTIFY_DONE; |
555 | |
556 | /* ignore non-CLIP devices */ |
557 | if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) |
558 | return NOTIFY_DONE; |
559 | |
560 | switch (event) { |
561 | case NETDEV_UP: |
562 | pr_debug("NETDEV_UP\n" ); |
563 | to_atmarpd(type: act_up, PRIV(dev)->number, ip: 0); |
564 | break; |
565 | case NETDEV_GOING_DOWN: |
566 | pr_debug("NETDEV_DOWN\n" ); |
567 | to_atmarpd(type: act_down, PRIV(dev)->number, ip: 0); |
568 | break; |
569 | case NETDEV_CHANGE: |
570 | case NETDEV_CHANGEMTU: |
571 | pr_debug("NETDEV_CHANGE*\n" ); |
572 | to_atmarpd(type: act_change, PRIV(dev)->number, ip: 0); |
573 | break; |
574 | } |
575 | return NOTIFY_DONE; |
576 | } |
577 | |
578 | static int clip_inet_event(struct notifier_block *this, unsigned long event, |
579 | void *ifa) |
580 | { |
581 | struct in_device *in_dev; |
582 | struct netdev_notifier_info info; |
583 | |
584 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
585 | /* |
586 | * Transitions are of the down-change-up type, so it's sufficient to |
587 | * handle the change on up. |
588 | */ |
589 | if (event != NETDEV_UP) |
590 | return NOTIFY_DONE; |
591 | netdev_notifier_info_init(info: &info, dev: in_dev->dev); |
592 | return clip_device_event(this, event: NETDEV_CHANGE, ptr: &info); |
593 | } |
594 | |
595 | static struct notifier_block clip_dev_notifier = { |
596 | .notifier_call = clip_device_event, |
597 | }; |
598 | |
599 | |
600 | |
601 | static struct notifier_block clip_inet_notifier = { |
602 | .notifier_call = clip_inet_event, |
603 | }; |
604 | |
605 | |
606 | |
607 | static void atmarpd_close(struct atm_vcc *vcc) |
608 | { |
609 | pr_debug("\n" ); |
610 | |
611 | rtnl_lock(); |
612 | atmarpd = NULL; |
613 | skb_queue_purge(list: &sk_atm(vcc)->sk_receive_queue); |
614 | rtnl_unlock(); |
615 | |
616 | pr_debug("(done)\n" ); |
617 | module_put(THIS_MODULE); |
618 | } |
619 | |
620 | static const struct atmdev_ops atmarpd_dev_ops = { |
621 | .close = atmarpd_close |
622 | }; |
623 | |
624 | |
625 | static struct atm_dev atmarpd_dev = { |
626 | .ops = &atmarpd_dev_ops, |
627 | .type = "arpd" , |
628 | .number = 999, |
629 | .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) |
630 | }; |
631 | |
632 | |
633 | static int atm_init_atmarp(struct atm_vcc *vcc) |
634 | { |
635 | rtnl_lock(); |
636 | if (atmarpd) { |
637 | rtnl_unlock(); |
638 | return -EADDRINUSE; |
639 | } |
640 | |
641 | mod_timer(timer: &idle_timer, expires: jiffies + CLIP_CHECK_INTERVAL * HZ); |
642 | |
643 | atmarpd = vcc; |
644 | set_bit(nr: ATM_VF_META, addr: &vcc->flags); |
645 | set_bit(nr: ATM_VF_READY, addr: &vcc->flags); |
646 | /* allow replies and avoid getting closed if signaling dies */ |
647 | vcc->dev = &atmarpd_dev; |
648 | vcc_insert_socket(sk: sk_atm(vcc)); |
649 | vcc->push = NULL; |
650 | vcc->pop = NULL; /* crash */ |
651 | vcc->push_oam = NULL; /* crash */ |
652 | rtnl_unlock(); |
653 | return 0; |
654 | } |
655 | |
656 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
657 | { |
658 | struct atm_vcc *vcc = ATM_SD(sock); |
659 | int err = 0; |
660 | |
661 | switch (cmd) { |
662 | case SIOCMKCLIP: |
663 | case ATMARPD_CTRL: |
664 | case ATMARP_MKIP: |
665 | case ATMARP_SETENTRY: |
666 | case ATMARP_ENCAP: |
667 | if (!capable(CAP_NET_ADMIN)) |
668 | return -EPERM; |
669 | break; |
670 | default: |
671 | return -ENOIOCTLCMD; |
672 | } |
673 | |
674 | switch (cmd) { |
675 | case SIOCMKCLIP: |
676 | err = clip_create(number: arg); |
677 | break; |
678 | case ATMARPD_CTRL: |
679 | err = atm_init_atmarp(vcc); |
680 | if (!err) { |
681 | sock->state = SS_CONNECTED; |
682 | __module_get(THIS_MODULE); |
683 | } |
684 | break; |
685 | case ATMARP_MKIP: |
686 | err = clip_mkip(vcc, timeout: arg); |
687 | break; |
688 | case ATMARP_SETENTRY: |
689 | err = clip_setentry(vcc, ip: (__force __be32)arg); |
690 | break; |
691 | case ATMARP_ENCAP: |
692 | err = clip_encap(vcc, mode: arg); |
693 | break; |
694 | } |
695 | return err; |
696 | } |
697 | |
698 | static struct atm_ioctl clip_ioctl_ops = { |
699 | .owner = THIS_MODULE, |
700 | .ioctl = clip_ioctl, |
701 | }; |
702 | |
703 | #ifdef CONFIG_PROC_FS |
704 | |
705 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) |
706 | { |
707 | static int code[] = { 1, 2, 10, 6, 1, 0 }; |
708 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; |
709 | |
710 | if (*addr->sas_addr.pub) { |
711 | seq_printf(m: seq, fmt: "%s" , addr->sas_addr.pub); |
712 | if (*addr->sas_addr.prv) |
713 | seq_putc(m: seq, c: '+'); |
714 | } else if (!*addr->sas_addr.prv) { |
715 | seq_printf(m: seq, fmt: "%s" , "(none)" ); |
716 | return; |
717 | } |
718 | if (*addr->sas_addr.prv) { |
719 | unsigned char *prv = addr->sas_addr.prv; |
720 | int *fields; |
721 | int i, j; |
722 | |
723 | fields = *prv == ATM_AFI_E164 ? e164 : code; |
724 | for (i = 0; fields[i]; i++) { |
725 | for (j = fields[i]; j; j--) |
726 | seq_printf(m: seq, fmt: "%02X" , *prv++); |
727 | if (fields[i + 1]) |
728 | seq_putc(m: seq, c: '.'); |
729 | } |
730 | } |
731 | } |
732 | |
733 | /* This means the neighbour entry has no attached VCC objects. */ |
734 | #define SEQ_NO_VCC_TOKEN ((void *) 2) |
735 | |
736 | static void atmarp_info(struct seq_file *seq, struct neighbour *n, |
737 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) |
738 | { |
739 | struct net_device *dev = n->dev; |
740 | unsigned long exp; |
741 | char buf[17]; |
742 | int svc, llc, off; |
743 | |
744 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || |
745 | (sk_atm(vcc: clip_vcc->vcc)->sk_family == AF_ATMSVC)); |
746 | |
747 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
748 | |
749 | if (clip_vcc == SEQ_NO_VCC_TOKEN) |
750 | exp = entry->neigh->used; |
751 | else |
752 | exp = clip_vcc->last_use; |
753 | |
754 | exp = (jiffies - exp) / HZ; |
755 | |
756 | seq_printf(m: seq, fmt: "%-6s%-4s%-4s%5ld " , |
757 | dev->name, svc ? "SVC" : "PVC" , llc ? "LLC" : "NULL" , exp); |
758 | |
759 | off = scnprintf(buf, size: sizeof(buf) - 1, fmt: "%pI4" , n->primary_key); |
760 | while (off < 16) |
761 | buf[off++] = ' '; |
762 | buf[off] = '\0'; |
763 | seq_printf(m: seq, fmt: "%s" , buf); |
764 | |
765 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { |
766 | if (time_before(jiffies, entry->expires)) |
767 | seq_printf(m: seq, fmt: "(resolving)\n" ); |
768 | else |
769 | seq_printf(m: seq, fmt: "(expired, ref %d)\n" , |
770 | refcount_read(r: &entry->neigh->refcnt)); |
771 | } else if (!svc) { |
772 | seq_printf(m: seq, fmt: "%d.%d.%d\n" , |
773 | clip_vcc->vcc->dev->number, |
774 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
775 | } else { |
776 | svc_addr(seq, addr: &clip_vcc->vcc->remote); |
777 | seq_putc(m: seq, c: '\n'); |
778 | } |
779 | } |
780 | |
781 | struct clip_seq_state { |
782 | /* This member must be first. */ |
783 | struct neigh_seq_state ns; |
784 | |
785 | /* Local to clip specific iteration. */ |
786 | struct clip_vcc *vcc; |
787 | }; |
788 | |
789 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, |
790 | struct clip_vcc *curr) |
791 | { |
792 | if (!curr) { |
793 | curr = e->vccs; |
794 | if (!curr) |
795 | return SEQ_NO_VCC_TOKEN; |
796 | return curr; |
797 | } |
798 | if (curr == SEQ_NO_VCC_TOKEN) |
799 | return NULL; |
800 | |
801 | curr = curr->next; |
802 | |
803 | return curr; |
804 | } |
805 | |
806 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, |
807 | struct atmarp_entry *e, loff_t * pos) |
808 | { |
809 | struct clip_vcc *vcc = state->vcc; |
810 | |
811 | vcc = clip_seq_next_vcc(e, curr: vcc); |
812 | if (vcc && pos != NULL) { |
813 | while (*pos) { |
814 | vcc = clip_seq_next_vcc(e, curr: vcc); |
815 | if (!vcc) |
816 | break; |
817 | --(*pos); |
818 | } |
819 | } |
820 | state->vcc = vcc; |
821 | |
822 | return vcc; |
823 | } |
824 | |
825 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
826 | struct neighbour *n, loff_t * pos) |
827 | { |
828 | struct clip_seq_state *state = (struct clip_seq_state *)_state; |
829 | |
830 | if (n->dev->type != ARPHRD_ATM) |
831 | return NULL; |
832 | |
833 | return clip_seq_vcc_walk(state, e: neighbour_priv(n), pos); |
834 | } |
835 | |
836 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
837 | { |
838 | struct clip_seq_state *state = seq->private; |
839 | state->ns.neigh_sub_iter = clip_seq_sub_iter; |
840 | return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY); |
841 | } |
842 | |
843 | static int clip_seq_show(struct seq_file *seq, void *v) |
844 | { |
845 | static char atm_arp_banner[] = |
846 | "IPitf TypeEncp Idle IP address ATM address\n" ; |
847 | |
848 | if (v == SEQ_START_TOKEN) { |
849 | seq_puts(m: seq, s: atm_arp_banner); |
850 | } else { |
851 | struct clip_seq_state *state = seq->private; |
852 | struct clip_vcc *vcc = state->vcc; |
853 | struct neighbour *n = v; |
854 | |
855 | atmarp_info(seq, n, entry: neighbour_priv(n), clip_vcc: vcc); |
856 | } |
857 | return 0; |
858 | } |
859 | |
860 | static const struct seq_operations arp_seq_ops = { |
861 | .start = clip_seq_start, |
862 | .next = neigh_seq_next, |
863 | .stop = neigh_seq_stop, |
864 | .show = clip_seq_show, |
865 | }; |
866 | #endif |
867 | |
868 | static void atm_clip_exit_noproc(void); |
869 | |
870 | static int __init atm_clip_init(void) |
871 | { |
872 | register_atm_ioctl(&clip_ioctl_ops); |
873 | register_netdevice_notifier(nb: &clip_dev_notifier); |
874 | register_inetaddr_notifier(nb: &clip_inet_notifier); |
875 | |
876 | timer_setup(&idle_timer, idle_timer_check, 0); |
877 | |
878 | #ifdef CONFIG_PROC_FS |
879 | { |
880 | struct proc_dir_entry *p; |
881 | |
882 | p = proc_create_net("arp" , 0444, atm_proc_root, &arp_seq_ops, |
883 | sizeof(struct clip_seq_state)); |
884 | if (!p) { |
885 | pr_err("Unable to initialize /proc/net/atm/arp\n" ); |
886 | atm_clip_exit_noproc(); |
887 | return -ENOMEM; |
888 | } |
889 | } |
890 | #endif |
891 | |
892 | return 0; |
893 | } |
894 | |
895 | static void atm_clip_exit_noproc(void) |
896 | { |
897 | struct net_device *dev, *next; |
898 | |
899 | unregister_inetaddr_notifier(nb: &clip_inet_notifier); |
900 | unregister_netdevice_notifier(nb: &clip_dev_notifier); |
901 | |
902 | deregister_atm_ioctl(&clip_ioctl_ops); |
903 | |
904 | /* First, stop the idle timer, so it stops banging |
905 | * on the table. |
906 | */ |
907 | del_timer_sync(timer: &idle_timer); |
908 | |
909 | dev = clip_devs; |
910 | while (dev) { |
911 | next = PRIV(dev)->next; |
912 | unregister_netdev(dev); |
913 | free_netdev(dev); |
914 | dev = next; |
915 | } |
916 | } |
917 | |
918 | static void __exit atm_clip_exit(void) |
919 | { |
920 | remove_proc_entry("arp" , atm_proc_root); |
921 | |
922 | atm_clip_exit_noproc(); |
923 | } |
924 | |
925 | module_init(atm_clip_init); |
926 | module_exit(atm_clip_exit); |
927 | MODULE_AUTHOR("Werner Almesberger" ); |
928 | MODULE_DESCRIPTION("Classical/IP over ATM interface" ); |
929 | MODULE_LICENSE("GPL" ); |
930 | |