Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* net/atm/clip.c - RFC1577 Classical IP over ATM */ |
2 | ||
3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ | |
4 | ||
1da177e4 LT |
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> | |
4fc268d2 | 20 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
4bdbf6c0 | 26 | #include <linux/poison.h> |
1da177e4 LT |
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" | |
1da177e4 LT |
41 | #include <net/atmclip.h> |
42 | ||
1da177e4 LT |
43 | static struct net_device *clip_devs; |
44 | static struct atm_vcc *atmarpd; | |
45 | static struct neigh_table clip_tbl; | |
46 | static struct timer_list idle_timer; | |
1da177e4 | 47 | |
30d492da | 48 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) |
1da177e4 LT |
49 | { |
50 | struct sock *sk; | |
51 | struct atmarp_ctrl *ctrl; | |
52 | struct sk_buff *skb; | |
53 | ||
52240062 | 54 | pr_debug("to_atmarpd(%d)\n", type); |
e49e76db SH |
55 | if (!atmarpd) |
56 | return -EUNATCH; | |
1da177e4 | 57 | skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); |
e49e76db SH |
58 | if (!skb) |
59 | return -ENOMEM; | |
1da177e4 LT |
60 | ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); |
61 | ctrl->type = type; | |
62 | ctrl->itf_num = itf; | |
63 | ctrl->ip = ip; | |
e49e76db | 64 | atm_force_charge(atmarpd, skb->truesize); |
1da177e4 LT |
65 | |
66 | sk = sk_atm(atmarpd); | |
67 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
68 | sk->sk_data_ready(sk, skb->len); | |
69 | return 0; | |
70 | } | |
71 | ||
e49e76db | 72 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
1da177e4 | 73 | { |
52240062 | 74 | pr_debug("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, |
e49e76db | 75 | entry->neigh); |
1da177e4 | 76 | clip_vcc->entry = entry; |
e49e76db | 77 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
1da177e4 LT |
78 | clip_vcc->next = entry->vccs; |
79 | entry->vccs = clip_vcc; | |
80 | entry->neigh->used = jiffies; | |
81 | } | |
82 | ||
1da177e4 LT |
83 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
84 | { | |
85 | struct atmarp_entry *entry = clip_vcc->entry; | |
86 | struct clip_vcc **walk; | |
87 | ||
88 | if (!entry) { | |
e49e76db | 89 | printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); |
1da177e4 LT |
90 | return; |
91 | } | |
932ff279 | 92 | netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ |
1da177e4 LT |
93 | entry->neigh->used = jiffies; |
94 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) | |
95 | if (*walk == clip_vcc) { | |
96 | int error; | |
97 | ||
e49e76db | 98 | *walk = clip_vcc->next; /* atomic */ |
1da177e4 LT |
99 | clip_vcc->entry = NULL; |
100 | if (clip_vcc->xoff) | |
101 | netif_wake_queue(entry->neigh->dev); | |
102 | if (entry->vccs) | |
103 | goto out; | |
e49e76db SH |
104 | entry->expires = jiffies - 1; |
105 | /* force resolution or expiration */ | |
1da177e4 LT |
106 | error = neigh_update(entry->neigh, NULL, NUD_NONE, |
107 | NEIGH_UPDATE_F_ADMIN); | |
108 | if (error) | |
109 | printk(KERN_CRIT "unlink_clip_vcc: " | |
e49e76db | 110 | "neigh_update failed with %d\n", error); |
1da177e4 LT |
111 | goto out; |
112 | } | |
113 | printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " | |
e49e76db SH |
114 | "0x%p)\n", entry, clip_vcc); |
115 | out: | |
932ff279 | 116 | netif_tx_unlock_bh(entry->neigh->dev); |
1da177e4 LT |
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)) { | |
52240062 | 129 | pr_debug("releasing vcc %p->%p of entry %p\n", |
1da177e4 LT |
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 | ||
52240062 | 141 | pr_debug("destruction postponed with ref %d\n", |
1da177e4 LT |
142 | atomic_read(&n->refcnt)); |
143 | ||
e49e76db | 144 | while ((skb = skb_dequeue(&n->arp_queue)) != NULL) |
1da177e4 LT |
145 | dev_kfree_skb(skb); |
146 | ||
147 | return 0; | |
148 | } | |
149 | ||
52240062 | 150 | pr_debug("expired neigh %p\n", n); |
1da177e4 LT |
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); | |
e49e76db | 158 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
1da177e4 LT |
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 | ||
52240062 | 166 | pr_debug("clip_arp_rcv\n"); |
1da177e4 | 167 | vcc = ATM_SKB(skb)->vcc; |
e49e76db | 168 | if (!vcc || !atm_charge(vcc, skb->truesize)) { |
1da177e4 LT |
169 | dev_kfree_skb_any(skb); |
170 | return 0; | |
171 | } | |
52240062 SH |
172 | pr_debug("pushing to %p\n", vcc); |
173 | pr_debug("using %p\n", CLIP_VCC(vcc)->old_push); | |
e49e76db | 174 | CLIP_VCC(vcc)->old_push(vcc, skb); |
1da177e4 LT |
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, | |
e49e76db SH |
184 | 0x00 |
185 | }; | |
1da177e4 | 186 | |
e49e76db | 187 | static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
188 | { |
189 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
190 | ||
52240062 | 191 | pr_debug("clip push\n"); |
1da177e4 | 192 | if (!skb) { |
52240062 | 193 | pr_debug("removing VCC %p\n", clip_vcc); |
e49e76db SH |
194 | if (clip_vcc->entry) |
195 | unlink_clip_vcc(clip_vcc); | |
196 | clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ | |
1da177e4 LT |
197 | kfree(clip_vcc); |
198 | return; | |
199 | } | |
e49e76db | 200 | atm_return(vcc, skb->truesize); |
1da177e4 | 201 | skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; |
e49e76db | 202 | /* clip_vcc->entry == NULL if we don't have an IP address yet */ |
1da177e4 LT |
203 | if (!skb->dev) { |
204 | dev_kfree_skb_any(skb); | |
205 | return; | |
206 | } | |
207 | ATM_SKB(skb)->vcc = vcc; | |
459a98ed | 208 | skb_reset_mac_header(skb); |
e49e76db SH |
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); | |
1da177e4 | 213 | else { |
30d492da | 214 | skb->protocol = ((__be16 *) skb->data)[3]; |
e49e76db | 215 | skb_pull(skb, RFC1483LLC_LEN); |
1da177e4 LT |
216 | if (skb->protocol == htons(ETH_P_ARP)) { |
217 | PRIV(skb->dev)->stats.rx_packets++; | |
218 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
219 | clip_arp_rcv(skb); | |
220 | return; | |
221 | } | |
222 | } | |
223 | clip_vcc->last_use = jiffies; | |
224 | PRIV(skb->dev)->stats.rx_packets++; | |
225 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
226 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
227 | netif_rx(skb); | |
228 | } | |
229 | ||
1da177e4 LT |
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 | ||
e49e76db | 235 | static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
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 | ||
52240062 | 242 | pr_debug("clip_pop(vcc %p)\n", vcc); |
e49e76db | 243 | clip_vcc->old_pop(vcc, skb); |
1da177e4 | 244 | /* skb->dev == NULL in outbound ARP packets */ |
e49e76db SH |
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); | |
1da177e4 | 252 | } |
e49e76db | 253 | spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); |
1da177e4 LT |
254 | } |
255 | ||
e49e76db | 256 | static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 257 | { |
52240062 | 258 | pr_debug("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); |
e49e76db | 259 | to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); |
1da177e4 LT |
260 | } |
261 | ||
e49e76db | 262 | static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
263 | { |
264 | #ifndef CONFIG_ATM_CLIP_NO_ICMP | |
e49e76db | 265 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
1da177e4 LT |
266 | #endif |
267 | kfree_skb(skb); | |
268 | } | |
269 | ||
1da177e4 LT |
270 | static struct neigh_ops clip_neigh_ops = { |
271 | .family = AF_INET, | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
52240062 | 287 | pr_debug("clip_constructor (neigh %p, entry %p)\n", neigh, entry); |
6b175b26 | 288 | neigh->type = inet_addr_type(&init_net, entry->ip); |
e49e76db SH |
289 | if (neigh->type != RTN_UNICAST) |
290 | return -EINVAL; | |
1da177e4 LT |
291 | |
292 | rcu_read_lock(); | |
e5ed6399 | 293 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
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; | |
e49e76db | 309 | entry->expires = jiffies - 1; |
1da177e4 LT |
310 | return 0; |
311 | } | |
312 | ||
313 | static u32 clip_hash(const void *pkey, const struct net_device *dev) | |
314 | { | |
e49e76db | 315 | return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
e49e76db | 357 | static int clip_encap(struct atm_vcc *vcc, int mode) |
1da177e4 LT |
358 | { |
359 | CLIP_VCC(vcc)->encap = mode; | |
360 | return 0; | |
361 | } | |
362 | ||
e49e76db | 363 | static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
364 | { |
365 | struct clip_priv *clip_priv = PRIV(dev); | |
366 | struct atmarp_entry *entry; | |
367 | struct atm_vcc *vcc; | |
368 | int old; | |
369 | unsigned long flags; | |
370 | ||
52240062 | 371 | pr_debug("clip_start_xmit (skb %p)\n", skb); |
1da177e4 LT |
372 | if (!skb->dst) { |
373 | printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); | |
374 | dev_kfree_skb(skb); | |
375 | clip_priv->stats.tx_dropped++; | |
376 | return 0; | |
377 | } | |
378 | if (!skb->dst->neighbour) { | |
379 | #if 0 | |
e49e76db | 380 | skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); |
1da177e4 | 381 | if (!skb->dst->neighbour) { |
e49e76db | 382 | dev_kfree_skb(skb); /* lost that one */ |
1da177e4 LT |
383 | clip_priv->stats.tx_dropped++; |
384 | return 0; | |
385 | } | |
386 | #endif | |
387 | printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); | |
388 | dev_kfree_skb(skb); | |
389 | clip_priv->stats.tx_dropped++; | |
390 | return 0; | |
391 | } | |
392 | entry = NEIGH2ENTRY(skb->dst->neighbour); | |
393 | if (!entry->vccs) { | |
394 | if (time_after(jiffies, entry->expires)) { | |
395 | /* should be resolved */ | |
e49e76db SH |
396 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
397 | to_atmarpd(act_need, PRIV(dev)->number, entry->ip); | |
1da177e4 LT |
398 | } |
399 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) | |
e49e76db | 400 | skb_queue_tail(&entry->neigh->arp_queue, skb); |
1da177e4 LT |
401 | else { |
402 | dev_kfree_skb(skb); | |
403 | clip_priv->stats.tx_dropped++; | |
404 | } | |
405 | return 0; | |
406 | } | |
52240062 | 407 | pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); |
1da177e4 | 408 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
52240062 | 409 | pr_debug("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); |
1da177e4 LT |
410 | if (entry->vccs->encap) { |
411 | void *here; | |
412 | ||
e49e76db SH |
413 | here = skb_push(skb, RFC1483LLC_LEN); |
414 | memcpy(here, llc_oui, sizeof(llc_oui)); | |
30d492da | 415 | ((__be16 *) here)[3] = skb->protocol; |
1da177e4 LT |
416 | } |
417 | atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); | |
418 | ATM_SKB(skb)->atm_options = vcc->atm_options; | |
419 | entry->vccs->last_use = jiffies; | |
52240062 | 420 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); |
e49e76db | 421 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ |
1da177e4 LT |
422 | if (old) { |
423 | printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); | |
424 | return 0; | |
425 | } | |
426 | clip_priv->stats.tx_packets++; | |
427 | clip_priv->stats.tx_bytes += skb->len; | |
5ff765f3 | 428 | vcc->send(vcc, skb); |
e49e76db | 429 | if (atm_may_send(vcc, 0)) { |
1da177e4 LT |
430 | entry->vccs->xoff = 0; |
431 | return 0; | |
432 | } | |
e49e76db SH |
433 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
434 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ | |
1da177e4 LT |
435 | barrier(); |
436 | if (!entry->vccs->xoff) | |
437 | netif_start_queue(dev); | |
e49e76db SH |
438 | /* Oh, we just raced with clip_pop. netif_start_queue should be |
439 | good enough, because nothing should really be asleep because | |
440 | of the brief netif_stop_queue. If this isn't true or if it | |
441 | changes, use netif_wake_queue instead. */ | |
442 | spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); | |
1da177e4 LT |
443 | return 0; |
444 | } | |
445 | ||
1da177e4 LT |
446 | static struct net_device_stats *clip_get_stats(struct net_device *dev) |
447 | { | |
448 | return &PRIV(dev)->stats; | |
449 | } | |
450 | ||
e49e76db | 451 | static int clip_mkip(struct atm_vcc *vcc, int timeout) |
1da177e4 LT |
452 | { |
453 | struct clip_vcc *clip_vcc; | |
1da177e4 | 454 | struct sk_buff *skb; |
c40a27f4 DM |
455 | struct sk_buff_head *rq; |
456 | unsigned long flags; | |
1da177e4 | 457 | |
e49e76db SH |
458 | if (!vcc->push) |
459 | return -EBADFD; | |
460 | clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); | |
461 | if (!clip_vcc) | |
462 | return -ENOMEM; | |
52240062 | 463 | pr_debug("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc); |
1da177e4 LT |
464 | clip_vcc->vcc = vcc; |
465 | vcc->user_back = clip_vcc; | |
466 | set_bit(ATM_VF_IS_CLIP, &vcc->flags); | |
467 | clip_vcc->entry = NULL; | |
468 | clip_vcc->xoff = 0; | |
469 | clip_vcc->encap = 1; | |
470 | clip_vcc->last_use = jiffies; | |
e49e76db | 471 | clip_vcc->idle_timeout = timeout * HZ; |
1da177e4 LT |
472 | clip_vcc->old_push = vcc->push; |
473 | clip_vcc->old_pop = vcc->pop; | |
474 | vcc->push = clip_push; | |
475 | vcc->pop = clip_pop; | |
c40a27f4 DM |
476 | |
477 | rq = &sk_atm(vcc)->sk_receive_queue; | |
478 | ||
479 | spin_lock_irqsave(&rq->lock, flags); | |
480 | if (skb_queue_empty(rq)) { | |
481 | skb = NULL; | |
482 | } else { | |
483 | /* NULL terminate the list. */ | |
484 | rq->prev->next = NULL; | |
485 | skb = rq->next; | |
486 | } | |
487 | rq->prev = rq->next = (struct sk_buff *)rq; | |
488 | rq->qlen = 0; | |
489 | spin_unlock_irqrestore(&rq->lock, flags); | |
490 | ||
1da177e4 | 491 | /* re-process everything received between connection setup and MKIP */ |
c40a27f4 DM |
492 | while (skb) { |
493 | struct sk_buff *next = skb->next; | |
494 | ||
495 | skb->next = skb->prev = NULL; | |
1da177e4 | 496 | if (!clip_devs) { |
e49e76db | 497 | atm_return(vcc, skb->truesize); |
1da177e4 | 498 | kfree_skb(skb); |
e49e76db | 499 | } else { |
1da177e4 LT |
500 | unsigned int len = skb->len; |
501 | ||
fe26109a | 502 | skb_get(skb); |
e49e76db | 503 | clip_push(vcc, skb); |
1da177e4 LT |
504 | PRIV(skb->dev)->stats.rx_packets--; |
505 | PRIV(skb->dev)->stats.rx_bytes -= len; | |
fe26109a | 506 | kfree_skb(skb); |
1da177e4 | 507 | } |
c40a27f4 DM |
508 | |
509 | skb = next; | |
510 | } | |
1da177e4 LT |
511 | return 0; |
512 | } | |
513 | ||
30d492da | 514 | static int clip_setentry(struct atm_vcc *vcc, __be32 ip) |
1da177e4 LT |
515 | { |
516 | struct neighbour *neigh; | |
517 | struct atmarp_entry *entry; | |
518 | int error; | |
519 | struct clip_vcc *clip_vcc; | |
e49e76db | 520 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; |
1da177e4 LT |
521 | struct rtable *rt; |
522 | ||
523 | if (vcc->push != clip_push) { | |
524 | printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); | |
525 | return -EBADF; | |
526 | } | |
527 | clip_vcc = CLIP_VCC(vcc); | |
528 | if (!ip) { | |
529 | if (!clip_vcc->entry) { | |
530 | printk(KERN_ERR "hiding hidden ATMARP entry\n"); | |
531 | return 0; | |
532 | } | |
52240062 | 533 | pr_debug("setentry: remove\n"); |
1da177e4 LT |
534 | unlink_clip_vcc(clip_vcc); |
535 | return 0; | |
536 | } | |
f206351a | 537 | error = ip_route_output_key(&init_net, &rt, &fl); |
e49e76db SH |
538 | if (error) |
539 | return error; | |
540 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); | |
1da177e4 LT |
541 | ip_rt_put(rt); |
542 | if (!neigh) | |
543 | return -ENOMEM; | |
544 | entry = NEIGH2ENTRY(neigh); | |
545 | if (entry != clip_vcc->entry) { | |
e49e76db | 546 | if (!clip_vcc->entry) |
52240062 | 547 | pr_debug("setentry: add\n"); |
1da177e4 | 548 | else { |
52240062 | 549 | pr_debug("setentry: update\n"); |
1da177e4 LT |
550 | unlink_clip_vcc(clip_vcc); |
551 | } | |
e49e76db | 552 | link_vcc(clip_vcc, entry); |
1da177e4 | 553 | } |
e49e76db SH |
554 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, |
555 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
1da177e4 LT |
556 | neigh_release(neigh); |
557 | return error; | |
558 | } | |
559 | ||
1da177e4 LT |
560 | static void clip_setup(struct net_device *dev) |
561 | { | |
562 | dev->hard_start_xmit = clip_start_xmit; | |
563 | /* sg_xmit ... */ | |
564 | dev->get_stats = clip_get_stats; | |
565 | dev->type = ARPHRD_ATM; | |
566 | dev->hard_header_len = RFC1483LLC_LEN; | |
567 | dev->mtu = RFC1626_MTU; | |
e49e76db SH |
568 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
569 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
570 | /* length. tx_queue_len is only used for the default case, */ | |
571 | /* without any more elaborate queuing. 100 is a reasonable */ | |
572 | /* compromise between decent burst-tolerance and protection */ | |
573 | /* against memory hogs. */ | |
1da177e4 LT |
574 | } |
575 | ||
1da177e4 LT |
576 | static int clip_create(int number) |
577 | { | |
578 | struct net_device *dev; | |
579 | struct clip_priv *clip_priv; | |
580 | int error; | |
581 | ||
582 | if (number != -1) { | |
583 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
e49e76db SH |
584 | if (PRIV(dev)->number == number) |
585 | return -EEXIST; | |
586 | } else { | |
1da177e4 LT |
587 | number = 0; |
588 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
589 | if (PRIV(dev)->number >= number) | |
e49e76db | 590 | number = PRIV(dev)->number + 1; |
1da177e4 LT |
591 | } |
592 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
593 | if (!dev) | |
594 | return -ENOMEM; | |
595 | clip_priv = PRIV(dev); | |
e49e76db | 596 | sprintf(dev->name, "atm%d", number); |
1da177e4 LT |
597 | spin_lock_init(&clip_priv->xoff_lock); |
598 | clip_priv->number = number; | |
599 | error = register_netdev(dev); | |
600 | if (error) { | |
601 | free_netdev(dev); | |
602 | return error; | |
603 | } | |
604 | clip_priv->next = clip_devs; | |
605 | clip_devs = dev; | |
52240062 | 606 | pr_debug("registered (net:%s)\n", dev->name); |
1da177e4 LT |
607 | return number; |
608 | } | |
609 | ||
e49e76db | 610 | static int clip_device_event(struct notifier_block *this, unsigned long event, |
f3a0592b | 611 | void *arg) |
1da177e4 | 612 | { |
f3a0592b SH |
613 | struct net_device *dev = arg; |
614 | ||
c346dca1 | 615 | if (dev_net(dev) != &init_net) |
e9dc8653 EB |
616 | return NOTIFY_DONE; |
617 | ||
f3a0592b SH |
618 | if (event == NETDEV_UNREGISTER) { |
619 | neigh_ifdown(&clip_tbl, dev); | |
620 | return NOTIFY_DONE; | |
621 | } | |
622 | ||
1da177e4 | 623 | /* ignore non-CLIP devices */ |
f3a0592b | 624 | if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) |
1da177e4 | 625 | return NOTIFY_DONE; |
f3a0592b | 626 | |
1da177e4 | 627 | switch (event) { |
e49e76db | 628 | case NETDEV_UP: |
52240062 | 629 | pr_debug("clip_device_event NETDEV_UP\n"); |
5ff765f3 | 630 | to_atmarpd(act_up, PRIV(dev)->number, 0); |
e49e76db SH |
631 | break; |
632 | case NETDEV_GOING_DOWN: | |
52240062 | 633 | pr_debug("clip_device_event NETDEV_DOWN\n"); |
5ff765f3 | 634 | to_atmarpd(act_down, PRIV(dev)->number, 0); |
e49e76db SH |
635 | break; |
636 | case NETDEV_CHANGE: | |
637 | case NETDEV_CHANGEMTU: | |
52240062 | 638 | pr_debug("clip_device_event NETDEV_CHANGE*\n"); |
5ff765f3 | 639 | to_atmarpd(act_change, PRIV(dev)->number, 0); |
e49e76db | 640 | break; |
1da177e4 LT |
641 | } |
642 | return NOTIFY_DONE; | |
643 | } | |
644 | ||
e49e76db SH |
645 | static int clip_inet_event(struct notifier_block *this, unsigned long event, |
646 | void *ifa) | |
1da177e4 LT |
647 | { |
648 | struct in_device *in_dev; | |
649 | ||
e49e76db | 650 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
1da177e4 LT |
651 | /* |
652 | * Transitions are of the down-change-up type, so it's sufficient to | |
653 | * handle the change on up. | |
654 | */ | |
e49e76db SH |
655 | if (event != NETDEV_UP) |
656 | return NOTIFY_DONE; | |
657 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
1da177e4 LT |
658 | } |
659 | ||
660 | ||
661 | static struct notifier_block clip_dev_notifier = { | |
5ff765f3 | 662 | .notifier_call = clip_device_event, |
1da177e4 LT |
663 | }; |
664 | ||
665 | ||
666 | ||
667 | static struct notifier_block clip_inet_notifier = { | |
5ff765f3 | 668 | .notifier_call = clip_inet_event, |
1da177e4 LT |
669 | }; |
670 | ||
671 | ||
672 | ||
673 | static void atmarpd_close(struct atm_vcc *vcc) | |
674 | { | |
52240062 | 675 | pr_debug("atmarpd_close\n"); |
f3a0592b SH |
676 | |
677 | rtnl_lock(); | |
678 | atmarpd = NULL; | |
1da177e4 | 679 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); |
f3a0592b SH |
680 | rtnl_unlock(); |
681 | ||
52240062 | 682 | pr_debug("(done)\n"); |
1da177e4 LT |
683 | module_put(THIS_MODULE); |
684 | } | |
685 | ||
686 | ||
687 | static struct atmdev_ops atmarpd_dev_ops = { | |
688 | .close = atmarpd_close | |
689 | }; | |
690 | ||
691 | ||
692 | static struct atm_dev atmarpd_dev = { | |
693 | .ops = &atmarpd_dev_ops, | |
694 | .type = "arpd", | |
695 | .number = 999, | |
4ef8d0ae | 696 | .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) |
1da177e4 LT |
697 | }; |
698 | ||
699 | ||
700 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
701 | { | |
f3a0592b SH |
702 | rtnl_lock(); |
703 | if (atmarpd) { | |
704 | rtnl_unlock(); | |
705 | return -EADDRINUSE; | |
706 | } | |
707 | ||
2d907392 SH |
708 | mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); |
709 | ||
1da177e4 LT |
710 | atmarpd = vcc; |
711 | set_bit(ATM_VF_META,&vcc->flags); | |
712 | set_bit(ATM_VF_READY,&vcc->flags); | |
713 | /* allow replies and avoid getting closed if signaling dies */ | |
714 | vcc->dev = &atmarpd_dev; | |
715 | vcc_insert_socket(sk_atm(vcc)); | |
716 | vcc->push = NULL; | |
717 | vcc->pop = NULL; /* crash */ | |
718 | vcc->push_oam = NULL; /* crash */ | |
f3a0592b | 719 | rtnl_unlock(); |
1da177e4 LT |
720 | return 0; |
721 | } | |
722 | ||
723 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
724 | { | |
725 | struct atm_vcc *vcc = ATM_SD(sock); | |
726 | int err = 0; | |
727 | ||
728 | switch (cmd) { | |
e49e76db SH |
729 | case SIOCMKCLIP: |
730 | case ATMARPD_CTRL: | |
731 | case ATMARP_MKIP: | |
732 | case ATMARP_SETENTRY: | |
733 | case ATMARP_ENCAP: | |
734 | if (!capable(CAP_NET_ADMIN)) | |
735 | return -EPERM; | |
736 | break; | |
737 | default: | |
738 | return -ENOIOCTLCMD; | |
1da177e4 LT |
739 | } |
740 | ||
741 | switch (cmd) { | |
e49e76db SH |
742 | case SIOCMKCLIP: |
743 | err = clip_create(arg); | |
744 | break; | |
745 | case ATMARPD_CTRL: | |
746 | err = atm_init_atmarp(vcc); | |
747 | if (!err) { | |
748 | sock->state = SS_CONNECTED; | |
749 | __module_get(THIS_MODULE); | |
750 | } | |
751 | break; | |
752 | case ATMARP_MKIP: | |
753 | err = clip_mkip(vcc, arg); | |
754 | break; | |
755 | case ATMARP_SETENTRY: | |
30d492da | 756 | err = clip_setentry(vcc, (__force __be32)arg); |
e49e76db SH |
757 | break; |
758 | case ATMARP_ENCAP: | |
759 | err = clip_encap(vcc, arg); | |
760 | break; | |
1da177e4 LT |
761 | } |
762 | return err; | |
763 | } | |
764 | ||
765 | static struct atm_ioctl clip_ioctl_ops = { | |
e49e76db SH |
766 | .owner = THIS_MODULE, |
767 | .ioctl = clip_ioctl, | |
1da177e4 LT |
768 | }; |
769 | ||
770 | #ifdef CONFIG_PROC_FS | |
771 | ||
772 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
773 | { | |
e49e76db SH |
774 | static int code[] = { 1, 2, 10, 6, 1, 0 }; |
775 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
1da177e4 LT |
776 | |
777 | if (*addr->sas_addr.pub) { | |
778 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
779 | if (*addr->sas_addr.prv) | |
780 | seq_putc(seq, '+'); | |
781 | } else if (!*addr->sas_addr.prv) { | |
782 | seq_printf(seq, "%s", "(none)"); | |
783 | return; | |
784 | } | |
785 | if (*addr->sas_addr.prv) { | |
786 | unsigned char *prv = addr->sas_addr.prv; | |
787 | int *fields; | |
788 | int i, j; | |
789 | ||
790 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
791 | for (i = 0; fields[i]; i++) { | |
792 | for (j = fields[i]; j; j--) | |
793 | seq_printf(seq, "%02X", *prv++); | |
e49e76db | 794 | if (fields[i + 1]) |
1da177e4 LT |
795 | seq_putc(seq, '.'); |
796 | } | |
797 | } | |
798 | } | |
799 | ||
800 | /* This means the neighbour entry has no attached VCC objects. */ | |
801 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
802 | ||
803 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
804 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
805 | { | |
806 | unsigned long exp; | |
807 | char buf[17]; | |
808 | int svc, llc, off; | |
809 | ||
810 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
811 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
812 | ||
e49e76db | 813 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
1da177e4 LT |
814 | |
815 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
816 | exp = entry->neigh->used; | |
817 | else | |
818 | exp = clip_vcc->last_use; | |
819 | ||
820 | exp = (jiffies - exp) / HZ; | |
821 | ||
822 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
e49e76db | 823 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); |
1da177e4 LT |
824 | |
825 | off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", | |
826 | NIPQUAD(entry->ip)); | |
827 | while (off < 16) | |
828 | buf[off++] = ' '; | |
829 | buf[off] = '\0'; | |
830 | seq_printf(seq, "%s", buf); | |
831 | ||
832 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
833 | if (time_before(jiffies, entry->expires)) | |
834 | seq_printf(seq, "(resolving)\n"); | |
835 | else | |
836 | seq_printf(seq, "(expired, ref %d)\n", | |
837 | atomic_read(&entry->neigh->refcnt)); | |
838 | } else if (!svc) { | |
839 | seq_printf(seq, "%d.%d.%d\n", | |
840 | clip_vcc->vcc->dev->number, | |
e49e76db | 841 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
1da177e4 LT |
842 | } else { |
843 | svc_addr(seq, &clip_vcc->vcc->remote); | |
844 | seq_putc(seq, '\n'); | |
845 | } | |
846 | } | |
847 | ||
848 | struct clip_seq_state { | |
849 | /* This member must be first. */ | |
850 | struct neigh_seq_state ns; | |
851 | ||
852 | /* Local to clip specific iteration. */ | |
853 | struct clip_vcc *vcc; | |
854 | }; | |
855 | ||
856 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
857 | struct clip_vcc *curr) | |
858 | { | |
859 | if (!curr) { | |
860 | curr = e->vccs; | |
861 | if (!curr) | |
862 | return SEQ_NO_VCC_TOKEN; | |
863 | return curr; | |
864 | } | |
865 | if (curr == SEQ_NO_VCC_TOKEN) | |
866 | return NULL; | |
867 | ||
868 | curr = curr->next; | |
869 | ||
870 | return curr; | |
871 | } | |
872 | ||
873 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
e49e76db | 874 | struct atmarp_entry *e, loff_t * pos) |
1da177e4 LT |
875 | { |
876 | struct clip_vcc *vcc = state->vcc; | |
877 | ||
878 | vcc = clip_seq_next_vcc(e, vcc); | |
879 | if (vcc && pos != NULL) { | |
880 | while (*pos) { | |
881 | vcc = clip_seq_next_vcc(e, vcc); | |
882 | if (!vcc) | |
883 | break; | |
884 | --(*pos); | |
885 | } | |
886 | } | |
887 | state->vcc = vcc; | |
888 | ||
889 | return vcc; | |
890 | } | |
e49e76db | 891 | |
1da177e4 | 892 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
e49e76db | 893 | struct neighbour *n, loff_t * pos) |
1da177e4 | 894 | { |
e49e76db | 895 | struct clip_seq_state *state = (struct clip_seq_state *)_state; |
1da177e4 LT |
896 | |
897 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
898 | } | |
899 | ||
e49e76db | 900 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
1da177e4 | 901 | { |
ae22120a DL |
902 | struct clip_seq_state *state = seq->private; |
903 | state->ns.neigh_sub_iter = clip_seq_sub_iter; | |
1da177e4 LT |
904 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); |
905 | } | |
906 | ||
907 | static int clip_seq_show(struct seq_file *seq, void *v) | |
908 | { | |
e49e76db SH |
909 | static char atm_arp_banner[] = |
910 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
1da177e4 LT |
911 | |
912 | if (v == SEQ_START_TOKEN) { | |
913 | seq_puts(seq, atm_arp_banner); | |
914 | } else { | |
915 | struct clip_seq_state *state = seq->private; | |
916 | struct neighbour *n = v; | |
917 | struct clip_vcc *vcc = state->vcc; | |
918 | ||
919 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
920 | } | |
e49e76db | 921 | return 0; |
1da177e4 LT |
922 | } |
923 | ||
56b3d975 | 924 | static const struct seq_operations arp_seq_ops = { |
1da177e4 LT |
925 | .start = clip_seq_start, |
926 | .next = neigh_seq_next, | |
927 | .stop = neigh_seq_stop, | |
928 | .show = clip_seq_show, | |
929 | }; | |
930 | ||
931 | static int arp_seq_open(struct inode *inode, struct file *file) | |
932 | { | |
ae22120a DL |
933 | return seq_open_net(inode, file, &arp_seq_ops, |
934 | sizeof(struct clip_seq_state)); | |
426b5303 EB |
935 | } |
936 | ||
9a32144e | 937 | static const struct file_operations arp_seq_fops = { |
1da177e4 LT |
938 | .open = arp_seq_open, |
939 | .read = seq_read, | |
940 | .llseek = seq_lseek, | |
ae22120a | 941 | .release = seq_release_net, |
1da177e4 LT |
942 | .owner = THIS_MODULE |
943 | }; | |
944 | #endif | |
945 | ||
dbee0d3f WC |
946 | static void atm_clip_exit_noproc(void); |
947 | ||
1da177e4 LT |
948 | static int __init atm_clip_init(void) |
949 | { | |
bd89efc5 | 950 | neigh_table_init_no_netlink(&clip_tbl); |
1da177e4 LT |
951 | |
952 | clip_tbl_hook = &clip_tbl; | |
953 | register_atm_ioctl(&clip_ioctl_ops); | |
f3a0592b SH |
954 | register_netdevice_notifier(&clip_dev_notifier); |
955 | register_inetaddr_notifier(&clip_inet_notifier); | |
1da177e4 | 956 | |
2d907392 SH |
957 | setup_timer(&idle_timer, idle_timer_check, 0); |
958 | ||
24781734 AB |
959 | #ifdef CONFIG_PROC_FS |
960 | { | |
961 | struct proc_dir_entry *p; | |
962 | ||
16e297b3 | 963 | p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); |
dbee0d3f WC |
964 | if (!p) { |
965 | printk(KERN_ERR "Unable to initialize " | |
966 | "/proc/net/atm/arp\n"); | |
967 | atm_clip_exit_noproc(); | |
968 | return -ENOMEM; | |
969 | } | |
24781734 AB |
970 | } |
971 | #endif | |
1da177e4 LT |
972 | |
973 | return 0; | |
974 | } | |
975 | ||
dbee0d3f | 976 | static void atm_clip_exit_noproc(void) |
1da177e4 LT |
977 | { |
978 | struct net_device *dev, *next; | |
979 | ||
f3a0592b SH |
980 | unregister_inetaddr_notifier(&clip_inet_notifier); |
981 | unregister_netdevice_notifier(&clip_dev_notifier); | |
982 | ||
1da177e4 LT |
983 | deregister_atm_ioctl(&clip_ioctl_ops); |
984 | ||
985 | /* First, stop the idle timer, so it stops banging | |
986 | * on the table. | |
987 | */ | |
2d907392 | 988 | del_timer_sync(&idle_timer); |
1da177e4 LT |
989 | |
990 | /* Next, purge the table, so that the device | |
991 | * unregister loop below does not hang due to | |
992 | * device references remaining in the table. | |
993 | */ | |
994 | neigh_ifdown(&clip_tbl, NULL); | |
995 | ||
996 | dev = clip_devs; | |
997 | while (dev) { | |
998 | next = PRIV(dev)->next; | |
999 | unregister_netdev(dev); | |
1000 | free_netdev(dev); | |
1001 | dev = next; | |
1002 | } | |
1003 | ||
1004 | /* Now it is safe to fully shutdown whole table. */ | |
1005 | neigh_table_clear(&clip_tbl); | |
1006 | ||
1007 | clip_tbl_hook = NULL; | |
1008 | } | |
1009 | ||
dbee0d3f WC |
1010 | static void __exit atm_clip_exit(void) |
1011 | { | |
1012 | remove_proc_entry("arp", atm_proc_root); | |
1013 | ||
1014 | atm_clip_exit_noproc(); | |
1015 | } | |
1016 | ||
1da177e4 LT |
1017 | module_init(atm_clip_init); |
1018 | module_exit(atm_clip_exit); | |
4909e488 SH |
1019 | MODULE_AUTHOR("Werner Almesberger"); |
1020 | MODULE_DESCRIPTION("Classical/IP over ATM interface"); | |
1da177e4 | 1021 | MODULE_LICENSE("GPL"); |