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/config.h> |
6 | #include <linux/string.h> | |
7 | #include <linux/errno.h> | |
8 | #include <linux/kernel.h> /* for UINT_MAX */ | |
9 | #include <linux/module.h> | |
10 | #include <linux/init.h> | |
11 | #include <linux/netdevice.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/wait.h> | |
14 | #include <linux/timer.h> | |
15 | #include <linux/if_arp.h> /* for some manifest constants */ | |
16 | #include <linux/notifier.h> | |
17 | #include <linux/atm.h> | |
18 | #include <linux/atmdev.h> | |
19 | #include <linux/atmclip.h> | |
20 | #include <linux/atmarp.h> | |
4fc268d2 | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/ip.h> /* for net/route.h */ |
23 | #include <linux/in.h> /* for struct sockaddr_in */ | |
24 | #include <linux/if.h> /* for IFF_UP */ | |
25 | #include <linux/inetdevice.h> | |
26 | #include <linux/bitops.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 "ipcommon.h" | |
42 | #include <net/atmclip.h> | |
43 | ||
44 | ||
45 | #if 0 | |
46 | #define DPRINTK(format,args...) printk(format,##args) | |
47 | #else | |
48 | #define DPRINTK(format,args...) | |
49 | #endif | |
50 | ||
51 | ||
52 | static struct net_device *clip_devs; | |
53 | static struct atm_vcc *atmarpd; | |
54 | static struct neigh_table clip_tbl; | |
55 | static struct timer_list idle_timer; | |
1da177e4 | 56 | |
e49e76db | 57 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, unsigned long ip) |
1da177e4 LT |
58 | { |
59 | struct sock *sk; | |
60 | struct atmarp_ctrl *ctrl; | |
61 | struct sk_buff *skb; | |
62 | ||
e49e76db SH |
63 | DPRINTK("to_atmarpd(%d)\n", type); |
64 | if (!atmarpd) | |
65 | return -EUNATCH; | |
1da177e4 | 66 | skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); |
e49e76db SH |
67 | if (!skb) |
68 | return -ENOMEM; | |
1da177e4 LT |
69 | ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); |
70 | ctrl->type = type; | |
71 | ctrl->itf_num = itf; | |
72 | ctrl->ip = ip; | |
e49e76db | 73 | atm_force_charge(atmarpd, skb->truesize); |
1da177e4 LT |
74 | |
75 | sk = sk_atm(atmarpd); | |
76 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
77 | sk->sk_data_ready(sk, skb->len); | |
78 | return 0; | |
79 | } | |
80 | ||
e49e76db | 81 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
1da177e4 | 82 | { |
e49e76db SH |
83 | DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, |
84 | entry->neigh); | |
1da177e4 | 85 | clip_vcc->entry = entry; |
e49e76db | 86 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
1da177e4 LT |
87 | clip_vcc->next = entry->vccs; |
88 | entry->vccs = clip_vcc; | |
89 | entry->neigh->used = jiffies; | |
90 | } | |
91 | ||
1da177e4 LT |
92 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
93 | { | |
94 | struct atmarp_entry *entry = clip_vcc->entry; | |
95 | struct clip_vcc **walk; | |
96 | ||
97 | if (!entry) { | |
e49e76db | 98 | printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); |
1da177e4 LT |
99 | return; |
100 | } | |
101 | spin_lock_bh(&entry->neigh->dev->xmit_lock); /* block clip_start_xmit() */ | |
102 | entry->neigh->used = jiffies; | |
103 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) | |
104 | if (*walk == clip_vcc) { | |
105 | int error; | |
106 | ||
e49e76db | 107 | *walk = clip_vcc->next; /* atomic */ |
1da177e4 LT |
108 | clip_vcc->entry = NULL; |
109 | if (clip_vcc->xoff) | |
110 | netif_wake_queue(entry->neigh->dev); | |
111 | if (entry->vccs) | |
112 | goto out; | |
e49e76db SH |
113 | entry->expires = jiffies - 1; |
114 | /* force resolution or expiration */ | |
1da177e4 LT |
115 | error = neigh_update(entry->neigh, NULL, NUD_NONE, |
116 | NEIGH_UPDATE_F_ADMIN); | |
117 | if (error) | |
118 | printk(KERN_CRIT "unlink_clip_vcc: " | |
e49e76db | 119 | "neigh_update failed with %d\n", error); |
1da177e4 LT |
120 | goto out; |
121 | } | |
122 | printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " | |
e49e76db SH |
123 | "0x%p)\n", entry, clip_vcc); |
124 | out: | |
1da177e4 LT |
125 | spin_unlock_bh(&entry->neigh->dev->xmit_lock); |
126 | } | |
127 | ||
128 | /* The neighbour entry n->lock is held. */ | |
129 | static int neigh_check_cb(struct neighbour *n) | |
130 | { | |
131 | struct atmarp_entry *entry = NEIGH2ENTRY(n); | |
132 | struct clip_vcc *cv; | |
133 | ||
134 | for (cv = entry->vccs; cv; cv = cv->next) { | |
135 | unsigned long exp = cv->last_use + cv->idle_timeout; | |
136 | ||
137 | if (cv->idle_timeout && time_after(jiffies, exp)) { | |
138 | DPRINTK("releasing vcc %p->%p of entry %p\n", | |
139 | cv, cv->vcc, entry); | |
140 | vcc_release_async(cv->vcc, -ETIMEDOUT); | |
141 | } | |
142 | } | |
143 | ||
144 | if (entry->vccs || time_before(jiffies, entry->expires)) | |
145 | return 0; | |
146 | ||
147 | if (atomic_read(&n->refcnt) > 1) { | |
148 | struct sk_buff *skb; | |
149 | ||
150 | DPRINTK("destruction postponed with ref %d\n", | |
151 | atomic_read(&n->refcnt)); | |
152 | ||
e49e76db | 153 | while ((skb = skb_dequeue(&n->arp_queue)) != NULL) |
1da177e4 LT |
154 | dev_kfree_skb(skb); |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
e49e76db | 159 | DPRINTK("expired neigh %p\n", n); |
1da177e4 LT |
160 | return 1; |
161 | } | |
162 | ||
163 | static void idle_timer_check(unsigned long dummy) | |
164 | { | |
165 | write_lock(&clip_tbl.lock); | |
166 | __neigh_for_each_release(&clip_tbl, neigh_check_cb); | |
e49e76db | 167 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
1da177e4 LT |
168 | write_unlock(&clip_tbl.lock); |
169 | } | |
170 | ||
171 | static int clip_arp_rcv(struct sk_buff *skb) | |
172 | { | |
173 | struct atm_vcc *vcc; | |
174 | ||
175 | DPRINTK("clip_arp_rcv\n"); | |
176 | vcc = ATM_SKB(skb)->vcc; | |
e49e76db | 177 | if (!vcc || !atm_charge(vcc, skb->truesize)) { |
1da177e4 LT |
178 | dev_kfree_skb_any(skb); |
179 | return 0; | |
180 | } | |
e49e76db SH |
181 | DPRINTK("pushing to %p\n", vcc); |
182 | DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push); | |
183 | CLIP_VCC(vcc)->old_push(vcc, skb); | |
1da177e4 LT |
184 | return 0; |
185 | } | |
186 | ||
187 | static const unsigned char llc_oui[] = { | |
188 | 0xaa, /* DSAP: non-ISO */ | |
189 | 0xaa, /* SSAP: non-ISO */ | |
190 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
191 | 0x00, /* OUI: EtherType */ | |
192 | 0x00, | |
e49e76db SH |
193 | 0x00 |
194 | }; | |
1da177e4 | 195 | |
e49e76db | 196 | static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
197 | { |
198 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
199 | ||
200 | DPRINTK("clip push\n"); | |
201 | if (!skb) { | |
e49e76db SH |
202 | DPRINTK("removing VCC %p\n", clip_vcc); |
203 | if (clip_vcc->entry) | |
204 | unlink_clip_vcc(clip_vcc); | |
205 | clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ | |
1da177e4 LT |
206 | kfree(clip_vcc); |
207 | return; | |
208 | } | |
e49e76db | 209 | atm_return(vcc, skb->truesize); |
1da177e4 | 210 | skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; |
e49e76db | 211 | /* clip_vcc->entry == NULL if we don't have an IP address yet */ |
1da177e4 LT |
212 | if (!skb->dev) { |
213 | dev_kfree_skb_any(skb); | |
214 | return; | |
215 | } | |
216 | ATM_SKB(skb)->vcc = vcc; | |
217 | skb->mac.raw = skb->data; | |
e49e76db SH |
218 | if (!clip_vcc->encap |
219 | || skb->len < RFC1483LLC_LEN | |
220 | || memcmp(skb->data, llc_oui, sizeof (llc_oui))) | |
221 | skb->protocol = htons(ETH_P_IP); | |
1da177e4 LT |
222 | else { |
223 | skb->protocol = ((u16 *) skb->data)[3]; | |
e49e76db | 224 | skb_pull(skb, RFC1483LLC_LEN); |
1da177e4 LT |
225 | if (skb->protocol == htons(ETH_P_ARP)) { |
226 | PRIV(skb->dev)->stats.rx_packets++; | |
227 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
228 | clip_arp_rcv(skb); | |
229 | return; | |
230 | } | |
231 | } | |
232 | clip_vcc->last_use = jiffies; | |
233 | PRIV(skb->dev)->stats.rx_packets++; | |
234 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
235 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
236 | netif_rx(skb); | |
237 | } | |
238 | ||
1da177e4 LT |
239 | /* |
240 | * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that | |
241 | * clip_pop is atomic with respect to the critical section in clip_start_xmit. | |
242 | */ | |
243 | ||
e49e76db | 244 | static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
245 | { |
246 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
247 | struct net_device *dev = skb->dev; | |
248 | int old; | |
249 | unsigned long flags; | |
250 | ||
e49e76db SH |
251 | DPRINTK("clip_pop(vcc %p)\n", vcc); |
252 | clip_vcc->old_pop(vcc, skb); | |
1da177e4 | 253 | /* skb->dev == NULL in outbound ARP packets */ |
e49e76db SH |
254 | if (!dev) |
255 | return; | |
256 | spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); | |
257 | if (atm_may_send(vcc, 0)) { | |
258 | old = xchg(&clip_vcc->xoff, 0); | |
259 | if (old) | |
260 | netif_wake_queue(dev); | |
1da177e4 | 261 | } |
e49e76db | 262 | spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); |
1da177e4 LT |
263 | } |
264 | ||
1da177e4 LT |
265 | static void clip_neigh_destroy(struct neighbour *neigh) |
266 | { | |
e49e76db | 267 | DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh); |
1da177e4 LT |
268 | if (NEIGH2ENTRY(neigh)->vccs) |
269 | printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n"); | |
270 | NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef; | |
271 | } | |
272 | ||
e49e76db | 273 | static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 274 | { |
e49e76db SH |
275 | DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); |
276 | to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); | |
1da177e4 LT |
277 | } |
278 | ||
e49e76db | 279 | static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
280 | { |
281 | #ifndef CONFIG_ATM_CLIP_NO_ICMP | |
e49e76db | 282 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
1da177e4 LT |
283 | #endif |
284 | kfree_skb(skb); | |
285 | } | |
286 | ||
1da177e4 LT |
287 | static struct neigh_ops clip_neigh_ops = { |
288 | .family = AF_INET, | |
1da177e4 LT |
289 | .solicit = clip_neigh_solicit, |
290 | .error_report = clip_neigh_error, | |
291 | .output = dev_queue_xmit, | |
292 | .connected_output = dev_queue_xmit, | |
293 | .hh_output = dev_queue_xmit, | |
294 | .queue_xmit = dev_queue_xmit, | |
295 | }; | |
296 | ||
1da177e4 LT |
297 | static int clip_constructor(struct neighbour *neigh) |
298 | { | |
299 | struct atmarp_entry *entry = NEIGH2ENTRY(neigh); | |
300 | struct net_device *dev = neigh->dev; | |
301 | struct in_device *in_dev; | |
302 | struct neigh_parms *parms; | |
303 | ||
e49e76db | 304 | DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry); |
1da177e4 | 305 | neigh->type = inet_addr_type(entry->ip); |
e49e76db SH |
306 | if (neigh->type != RTN_UNICAST) |
307 | return -EINVAL; | |
1da177e4 LT |
308 | |
309 | rcu_read_lock(); | |
e5ed6399 | 310 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
311 | if (!in_dev) { |
312 | rcu_read_unlock(); | |
313 | return -EINVAL; | |
314 | } | |
315 | ||
316 | parms = in_dev->arp_parms; | |
317 | __neigh_parms_put(neigh->parms); | |
318 | neigh->parms = neigh_parms_clone(parms); | |
319 | rcu_read_unlock(); | |
320 | ||
321 | neigh->ops = &clip_neigh_ops; | |
322 | neigh->output = neigh->nud_state & NUD_VALID ? | |
323 | neigh->ops->connected_output : neigh->ops->output; | |
324 | entry->neigh = neigh; | |
325 | entry->vccs = NULL; | |
e49e76db | 326 | entry->expires = jiffies - 1; |
1da177e4 LT |
327 | return 0; |
328 | } | |
329 | ||
330 | static u32 clip_hash(const void *pkey, const struct net_device *dev) | |
331 | { | |
e49e76db | 332 | return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); |
1da177e4 LT |
333 | } |
334 | ||
335 | static struct neigh_table clip_tbl = { | |
336 | .family = AF_INET, | |
337 | .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), | |
338 | .key_len = 4, | |
339 | .hash = clip_hash, | |
340 | .constructor = clip_constructor, | |
341 | .id = "clip_arp_cache", | |
342 | ||
343 | /* parameters are copied from ARP ... */ | |
344 | .parms = { | |
345 | .tbl = &clip_tbl, | |
aa837b5b | 346 | .neigh_destructor = clip_neigh_destroy, |
1da177e4 LT |
347 | .base_reachable_time = 30 * HZ, |
348 | .retrans_time = 1 * HZ, | |
349 | .gc_staletime = 60 * HZ, | |
350 | .reachable_time = 30 * HZ, | |
351 | .delay_probe_time = 5 * HZ, | |
352 | .queue_len = 3, | |
353 | .ucast_probes = 3, | |
354 | .mcast_probes = 3, | |
355 | .anycast_delay = 1 * HZ, | |
356 | .proxy_delay = (8 * HZ) / 10, | |
357 | .proxy_qlen = 64, | |
358 | .locktime = 1 * HZ, | |
359 | }, | |
360 | .gc_interval = 30 * HZ, | |
361 | .gc_thresh1 = 128, | |
362 | .gc_thresh2 = 512, | |
363 | .gc_thresh3 = 1024, | |
364 | }; | |
365 | ||
1da177e4 LT |
366 | /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ |
367 | ||
368 | /* | |
369 | * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means | |
370 | * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, | |
371 | * don't increment the usage count. This is used to create entries in | |
372 | * clip_setentry. | |
373 | */ | |
374 | ||
e49e76db | 375 | static int clip_encap(struct atm_vcc *vcc, int mode) |
1da177e4 LT |
376 | { |
377 | CLIP_VCC(vcc)->encap = mode; | |
378 | return 0; | |
379 | } | |
380 | ||
e49e76db | 381 | static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
382 | { |
383 | struct clip_priv *clip_priv = PRIV(dev); | |
384 | struct atmarp_entry *entry; | |
385 | struct atm_vcc *vcc; | |
386 | int old; | |
387 | unsigned long flags; | |
388 | ||
e49e76db | 389 | DPRINTK("clip_start_xmit (skb %p)\n", skb); |
1da177e4 LT |
390 | if (!skb->dst) { |
391 | printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); | |
392 | dev_kfree_skb(skb); | |
393 | clip_priv->stats.tx_dropped++; | |
394 | return 0; | |
395 | } | |
396 | if (!skb->dst->neighbour) { | |
397 | #if 0 | |
e49e76db | 398 | skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); |
1da177e4 | 399 | if (!skb->dst->neighbour) { |
e49e76db | 400 | dev_kfree_skb(skb); /* lost that one */ |
1da177e4 LT |
401 | clip_priv->stats.tx_dropped++; |
402 | return 0; | |
403 | } | |
404 | #endif | |
405 | printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); | |
406 | dev_kfree_skb(skb); | |
407 | clip_priv->stats.tx_dropped++; | |
408 | return 0; | |
409 | } | |
410 | entry = NEIGH2ENTRY(skb->dst->neighbour); | |
411 | if (!entry->vccs) { | |
412 | if (time_after(jiffies, entry->expires)) { | |
413 | /* should be resolved */ | |
e49e76db SH |
414 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
415 | to_atmarpd(act_need, PRIV(dev)->number, entry->ip); | |
1da177e4 LT |
416 | } |
417 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) | |
e49e76db | 418 | skb_queue_tail(&entry->neigh->arp_queue, skb); |
1da177e4 LT |
419 | else { |
420 | dev_kfree_skb(skb); | |
421 | clip_priv->stats.tx_dropped++; | |
422 | } | |
423 | return 0; | |
424 | } | |
e49e76db | 425 | DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs); |
1da177e4 | 426 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
e49e76db | 427 | DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); |
1da177e4 LT |
428 | if (entry->vccs->encap) { |
429 | void *here; | |
430 | ||
e49e76db SH |
431 | here = skb_push(skb, RFC1483LLC_LEN); |
432 | memcpy(here, llc_oui, sizeof(llc_oui)); | |
1da177e4 LT |
433 | ((u16 *) here)[3] = skb->protocol; |
434 | } | |
435 | atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); | |
436 | ATM_SKB(skb)->atm_options = vcc->atm_options; | |
437 | entry->vccs->last_use = jiffies; | |
e49e76db SH |
438 | DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); |
439 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ | |
1da177e4 LT |
440 | if (old) { |
441 | printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); | |
442 | return 0; | |
443 | } | |
444 | clip_priv->stats.tx_packets++; | |
445 | clip_priv->stats.tx_bytes += skb->len; | |
e49e76db SH |
446 | (void)vcc->send(vcc, skb); |
447 | if (atm_may_send(vcc, 0)) { | |
1da177e4 LT |
448 | entry->vccs->xoff = 0; |
449 | return 0; | |
450 | } | |
e49e76db SH |
451 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
452 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ | |
1da177e4 LT |
453 | barrier(); |
454 | if (!entry->vccs->xoff) | |
455 | netif_start_queue(dev); | |
e49e76db SH |
456 | /* Oh, we just raced with clip_pop. netif_start_queue should be |
457 | good enough, because nothing should really be asleep because | |
458 | of the brief netif_stop_queue. If this isn't true or if it | |
459 | changes, use netif_wake_queue instead. */ | |
460 | spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); | |
1da177e4 LT |
461 | return 0; |
462 | } | |
463 | ||
1da177e4 LT |
464 | static struct net_device_stats *clip_get_stats(struct net_device *dev) |
465 | { | |
466 | return &PRIV(dev)->stats; | |
467 | } | |
468 | ||
e49e76db | 469 | static int clip_mkip(struct atm_vcc *vcc, int timeout) |
1da177e4 LT |
470 | { |
471 | struct clip_vcc *clip_vcc; | |
472 | struct sk_buff_head copy; | |
473 | struct sk_buff *skb; | |
474 | ||
e49e76db SH |
475 | if (!vcc->push) |
476 | return -EBADFD; | |
477 | clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); | |
478 | if (!clip_vcc) | |
479 | return -ENOMEM; | |
480 | DPRINTK("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc); | |
1da177e4 LT |
481 | clip_vcc->vcc = vcc; |
482 | vcc->user_back = clip_vcc; | |
483 | set_bit(ATM_VF_IS_CLIP, &vcc->flags); | |
484 | clip_vcc->entry = NULL; | |
485 | clip_vcc->xoff = 0; | |
486 | clip_vcc->encap = 1; | |
487 | clip_vcc->last_use = jiffies; | |
e49e76db | 488 | clip_vcc->idle_timeout = timeout * HZ; |
1da177e4 LT |
489 | clip_vcc->old_push = vcc->push; |
490 | clip_vcc->old_pop = vcc->pop; | |
491 | vcc->push = clip_push; | |
492 | vcc->pop = clip_pop; | |
493 | skb_queue_head_init(©); | |
494 | skb_migrate(&sk_atm(vcc)->sk_receive_queue, ©); | |
495 | /* re-process everything received between connection setup and MKIP */ | |
496 | while ((skb = skb_dequeue(©)) != NULL) | |
497 | if (!clip_devs) { | |
e49e76db | 498 | atm_return(vcc, skb->truesize); |
1da177e4 | 499 | kfree_skb(skb); |
e49e76db | 500 | } else { |
1da177e4 LT |
501 | unsigned int len = skb->len; |
502 | ||
e49e76db | 503 | clip_push(vcc, skb); |
1da177e4 LT |
504 | PRIV(skb->dev)->stats.rx_packets--; |
505 | PRIV(skb->dev)->stats.rx_bytes -= len; | |
506 | } | |
507 | return 0; | |
508 | } | |
509 | ||
e49e76db | 510 | static int clip_setentry(struct atm_vcc *vcc, u32 ip) |
1da177e4 LT |
511 | { |
512 | struct neighbour *neigh; | |
513 | struct atmarp_entry *entry; | |
514 | int error; | |
515 | struct clip_vcc *clip_vcc; | |
e49e76db | 516 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; |
1da177e4 LT |
517 | struct rtable *rt; |
518 | ||
519 | if (vcc->push != clip_push) { | |
520 | printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); | |
521 | return -EBADF; | |
522 | } | |
523 | clip_vcc = CLIP_VCC(vcc); | |
524 | if (!ip) { | |
525 | if (!clip_vcc->entry) { | |
526 | printk(KERN_ERR "hiding hidden ATMARP entry\n"); | |
527 | return 0; | |
528 | } | |
529 | DPRINTK("setentry: remove\n"); | |
530 | unlink_clip_vcc(clip_vcc); | |
531 | return 0; | |
532 | } | |
e49e76db SH |
533 | error = ip_route_output_key(&rt, &fl); |
534 | if (error) | |
535 | return error; | |
536 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); | |
1da177e4 LT |
537 | ip_rt_put(rt); |
538 | if (!neigh) | |
539 | return -ENOMEM; | |
540 | entry = NEIGH2ENTRY(neigh); | |
541 | if (entry != clip_vcc->entry) { | |
e49e76db SH |
542 | if (!clip_vcc->entry) |
543 | DPRINTK("setentry: add\n"); | |
1da177e4 LT |
544 | else { |
545 | DPRINTK("setentry: update\n"); | |
546 | unlink_clip_vcc(clip_vcc); | |
547 | } | |
e49e76db | 548 | link_vcc(clip_vcc, entry); |
1da177e4 | 549 | } |
e49e76db SH |
550 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, |
551 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
1da177e4 LT |
552 | neigh_release(neigh); |
553 | return error; | |
554 | } | |
555 | ||
1da177e4 LT |
556 | static void clip_setup(struct net_device *dev) |
557 | { | |
558 | dev->hard_start_xmit = clip_start_xmit; | |
559 | /* sg_xmit ... */ | |
560 | dev->get_stats = clip_get_stats; | |
561 | dev->type = ARPHRD_ATM; | |
562 | dev->hard_header_len = RFC1483LLC_LEN; | |
563 | dev->mtu = RFC1626_MTU; | |
e49e76db SH |
564 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
565 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
566 | /* length. tx_queue_len is only used for the default case, */ | |
567 | /* without any more elaborate queuing. 100 is a reasonable */ | |
568 | /* compromise between decent burst-tolerance and protection */ | |
569 | /* against memory hogs. */ | |
1da177e4 LT |
570 | } |
571 | ||
1da177e4 LT |
572 | static int clip_create(int number) |
573 | { | |
574 | struct net_device *dev; | |
575 | struct clip_priv *clip_priv; | |
576 | int error; | |
577 | ||
578 | if (number != -1) { | |
579 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
e49e76db SH |
580 | if (PRIV(dev)->number == number) |
581 | return -EEXIST; | |
582 | } else { | |
1da177e4 LT |
583 | number = 0; |
584 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
585 | if (PRIV(dev)->number >= number) | |
e49e76db | 586 | number = PRIV(dev)->number + 1; |
1da177e4 LT |
587 | } |
588 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
589 | if (!dev) | |
590 | return -ENOMEM; | |
591 | clip_priv = PRIV(dev); | |
e49e76db | 592 | sprintf(dev->name, "atm%d", number); |
1da177e4 LT |
593 | spin_lock_init(&clip_priv->xoff_lock); |
594 | clip_priv->number = number; | |
595 | error = register_netdev(dev); | |
596 | if (error) { | |
597 | free_netdev(dev); | |
598 | return error; | |
599 | } | |
600 | clip_priv->next = clip_devs; | |
601 | clip_devs = dev; | |
e49e76db | 602 | DPRINTK("registered (net:%s)\n", dev->name); |
1da177e4 LT |
603 | return number; |
604 | } | |
605 | ||
e49e76db | 606 | static int clip_device_event(struct notifier_block *this, unsigned long event, |
f3a0592b | 607 | void *arg) |
1da177e4 | 608 | { |
f3a0592b SH |
609 | struct net_device *dev = arg; |
610 | ||
611 | if (event == NETDEV_UNREGISTER) { | |
612 | neigh_ifdown(&clip_tbl, dev); | |
613 | return NOTIFY_DONE; | |
614 | } | |
615 | ||
1da177e4 | 616 | /* ignore non-CLIP devices */ |
f3a0592b | 617 | if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) |
1da177e4 | 618 | return NOTIFY_DONE; |
f3a0592b | 619 | |
1da177e4 | 620 | switch (event) { |
e49e76db SH |
621 | case NETDEV_UP: |
622 | DPRINTK("clip_device_event NETDEV_UP\n"); | |
623 | (void)to_atmarpd(act_up, PRIV(dev)->number, 0); | |
624 | break; | |
625 | case NETDEV_GOING_DOWN: | |
626 | DPRINTK("clip_device_event NETDEV_DOWN\n"); | |
627 | (void)to_atmarpd(act_down, PRIV(dev)->number, 0); | |
628 | break; | |
629 | case NETDEV_CHANGE: | |
630 | case NETDEV_CHANGEMTU: | |
631 | DPRINTK("clip_device_event NETDEV_CHANGE*\n"); | |
632 | (void)to_atmarpd(act_change, PRIV(dev)->number, 0); | |
633 | break; | |
634 | case NETDEV_REBOOT: | |
635 | case NETDEV_REGISTER: | |
636 | case NETDEV_DOWN: | |
637 | DPRINTK("clip_device_event %ld\n", event); | |
638 | /* ignore */ | |
639 | break; | |
640 | default: | |
641 | printk(KERN_WARNING "clip_device_event: unknown event " | |
642 | "%ld\n", event); | |
643 | break; | |
1da177e4 LT |
644 | } |
645 | return NOTIFY_DONE; | |
646 | } | |
647 | ||
e49e76db SH |
648 | static int clip_inet_event(struct notifier_block *this, unsigned long event, |
649 | void *ifa) | |
1da177e4 LT |
650 | { |
651 | struct in_device *in_dev; | |
652 | ||
e49e76db | 653 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
1da177e4 LT |
654 | if (!in_dev || !in_dev->dev) { |
655 | printk(KERN_WARNING "clip_inet_event: no device\n"); | |
656 | return NOTIFY_DONE; | |
657 | } | |
658 | /* | |
659 | * Transitions are of the down-change-up type, so it's sufficient to | |
660 | * handle the change on up. | |
661 | */ | |
e49e76db SH |
662 | if (event != NETDEV_UP) |
663 | return NOTIFY_DONE; | |
664 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
1da177e4 LT |
665 | } |
666 | ||
667 | ||
668 | static struct notifier_block clip_dev_notifier = { | |
669 | clip_device_event, | |
670 | NULL, | |
671 | 0 | |
672 | }; | |
673 | ||
674 | ||
675 | ||
676 | static struct notifier_block clip_inet_notifier = { | |
677 | clip_inet_event, | |
678 | NULL, | |
679 | 0 | |
680 | }; | |
681 | ||
682 | ||
683 | ||
684 | static void atmarpd_close(struct atm_vcc *vcc) | |
685 | { | |
686 | DPRINTK("atmarpd_close\n"); | |
f3a0592b SH |
687 | |
688 | rtnl_lock(); | |
689 | atmarpd = NULL; | |
1da177e4 | 690 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); |
f3a0592b SH |
691 | rtnl_unlock(); |
692 | ||
1da177e4 LT |
693 | DPRINTK("(done)\n"); |
694 | module_put(THIS_MODULE); | |
695 | } | |
696 | ||
697 | ||
698 | static struct atmdev_ops atmarpd_dev_ops = { | |
699 | .close = atmarpd_close | |
700 | }; | |
701 | ||
702 | ||
703 | static struct atm_dev atmarpd_dev = { | |
704 | .ops = &atmarpd_dev_ops, | |
705 | .type = "arpd", | |
706 | .number = 999, | |
707 | .lock = SPIN_LOCK_UNLOCKED | |
708 | }; | |
709 | ||
710 | ||
711 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
712 | { | |
f3a0592b SH |
713 | rtnl_lock(); |
714 | if (atmarpd) { | |
715 | rtnl_unlock(); | |
716 | return -EADDRINUSE; | |
717 | } | |
718 | ||
2d907392 SH |
719 | mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); |
720 | ||
1da177e4 LT |
721 | atmarpd = vcc; |
722 | set_bit(ATM_VF_META,&vcc->flags); | |
723 | set_bit(ATM_VF_READY,&vcc->flags); | |
724 | /* allow replies and avoid getting closed if signaling dies */ | |
725 | vcc->dev = &atmarpd_dev; | |
726 | vcc_insert_socket(sk_atm(vcc)); | |
727 | vcc->push = NULL; | |
728 | vcc->pop = NULL; /* crash */ | |
729 | vcc->push_oam = NULL; /* crash */ | |
f3a0592b | 730 | rtnl_unlock(); |
1da177e4 LT |
731 | return 0; |
732 | } | |
733 | ||
734 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
735 | { | |
736 | struct atm_vcc *vcc = ATM_SD(sock); | |
737 | int err = 0; | |
738 | ||
739 | switch (cmd) { | |
e49e76db SH |
740 | case SIOCMKCLIP: |
741 | case ATMARPD_CTRL: | |
742 | case ATMARP_MKIP: | |
743 | case ATMARP_SETENTRY: | |
744 | case ATMARP_ENCAP: | |
745 | if (!capable(CAP_NET_ADMIN)) | |
746 | return -EPERM; | |
747 | break; | |
748 | default: | |
749 | return -ENOIOCTLCMD; | |
1da177e4 LT |
750 | } |
751 | ||
752 | switch (cmd) { | |
e49e76db SH |
753 | case SIOCMKCLIP: |
754 | err = clip_create(arg); | |
755 | break; | |
756 | case ATMARPD_CTRL: | |
757 | err = atm_init_atmarp(vcc); | |
758 | if (!err) { | |
759 | sock->state = SS_CONNECTED; | |
760 | __module_get(THIS_MODULE); | |
761 | } | |
762 | break; | |
763 | case ATMARP_MKIP: | |
764 | err = clip_mkip(vcc, arg); | |
765 | break; | |
766 | case ATMARP_SETENTRY: | |
767 | err = clip_setentry(vcc, arg); | |
768 | break; | |
769 | case ATMARP_ENCAP: | |
770 | err = clip_encap(vcc, arg); | |
771 | break; | |
1da177e4 LT |
772 | } |
773 | return err; | |
774 | } | |
775 | ||
776 | static struct atm_ioctl clip_ioctl_ops = { | |
e49e76db SH |
777 | .owner = THIS_MODULE, |
778 | .ioctl = clip_ioctl, | |
1da177e4 LT |
779 | }; |
780 | ||
781 | #ifdef CONFIG_PROC_FS | |
782 | ||
783 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
784 | { | |
e49e76db SH |
785 | static int code[] = { 1, 2, 10, 6, 1, 0 }; |
786 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
1da177e4 LT |
787 | |
788 | if (*addr->sas_addr.pub) { | |
789 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
790 | if (*addr->sas_addr.prv) | |
791 | seq_putc(seq, '+'); | |
792 | } else if (!*addr->sas_addr.prv) { | |
793 | seq_printf(seq, "%s", "(none)"); | |
794 | return; | |
795 | } | |
796 | if (*addr->sas_addr.prv) { | |
797 | unsigned char *prv = addr->sas_addr.prv; | |
798 | int *fields; | |
799 | int i, j; | |
800 | ||
801 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
802 | for (i = 0; fields[i]; i++) { | |
803 | for (j = fields[i]; j; j--) | |
804 | seq_printf(seq, "%02X", *prv++); | |
e49e76db | 805 | if (fields[i + 1]) |
1da177e4 LT |
806 | seq_putc(seq, '.'); |
807 | } | |
808 | } | |
809 | } | |
810 | ||
811 | /* This means the neighbour entry has no attached VCC objects. */ | |
812 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
813 | ||
814 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
815 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
816 | { | |
817 | unsigned long exp; | |
818 | char buf[17]; | |
819 | int svc, llc, off; | |
820 | ||
821 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
822 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
823 | ||
e49e76db | 824 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
1da177e4 LT |
825 | |
826 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
827 | exp = entry->neigh->used; | |
828 | else | |
829 | exp = clip_vcc->last_use; | |
830 | ||
831 | exp = (jiffies - exp) / HZ; | |
832 | ||
833 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
e49e76db | 834 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); |
1da177e4 LT |
835 | |
836 | off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", | |
837 | NIPQUAD(entry->ip)); | |
838 | while (off < 16) | |
839 | buf[off++] = ' '; | |
840 | buf[off] = '\0'; | |
841 | seq_printf(seq, "%s", buf); | |
842 | ||
843 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
844 | if (time_before(jiffies, entry->expires)) | |
845 | seq_printf(seq, "(resolving)\n"); | |
846 | else | |
847 | seq_printf(seq, "(expired, ref %d)\n", | |
848 | atomic_read(&entry->neigh->refcnt)); | |
849 | } else if (!svc) { | |
850 | seq_printf(seq, "%d.%d.%d\n", | |
851 | clip_vcc->vcc->dev->number, | |
e49e76db | 852 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
1da177e4 LT |
853 | } else { |
854 | svc_addr(seq, &clip_vcc->vcc->remote); | |
855 | seq_putc(seq, '\n'); | |
856 | } | |
857 | } | |
858 | ||
859 | struct clip_seq_state { | |
860 | /* This member must be first. */ | |
861 | struct neigh_seq_state ns; | |
862 | ||
863 | /* Local to clip specific iteration. */ | |
864 | struct clip_vcc *vcc; | |
865 | }; | |
866 | ||
867 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
868 | struct clip_vcc *curr) | |
869 | { | |
870 | if (!curr) { | |
871 | curr = e->vccs; | |
872 | if (!curr) | |
873 | return SEQ_NO_VCC_TOKEN; | |
874 | return curr; | |
875 | } | |
876 | if (curr == SEQ_NO_VCC_TOKEN) | |
877 | return NULL; | |
878 | ||
879 | curr = curr->next; | |
880 | ||
881 | return curr; | |
882 | } | |
883 | ||
884 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
e49e76db | 885 | struct atmarp_entry *e, loff_t * pos) |
1da177e4 LT |
886 | { |
887 | struct clip_vcc *vcc = state->vcc; | |
888 | ||
889 | vcc = clip_seq_next_vcc(e, vcc); | |
890 | if (vcc && pos != NULL) { | |
891 | while (*pos) { | |
892 | vcc = clip_seq_next_vcc(e, vcc); | |
893 | if (!vcc) | |
894 | break; | |
895 | --(*pos); | |
896 | } | |
897 | } | |
898 | state->vcc = vcc; | |
899 | ||
900 | return vcc; | |
901 | } | |
e49e76db | 902 | |
1da177e4 | 903 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
e49e76db | 904 | struct neighbour *n, loff_t * pos) |
1da177e4 | 905 | { |
e49e76db | 906 | struct clip_seq_state *state = (struct clip_seq_state *)_state; |
1da177e4 LT |
907 | |
908 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
909 | } | |
910 | ||
e49e76db | 911 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
1da177e4 LT |
912 | { |
913 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); | |
914 | } | |
915 | ||
916 | static int clip_seq_show(struct seq_file *seq, void *v) | |
917 | { | |
e49e76db SH |
918 | static char atm_arp_banner[] = |
919 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
1da177e4 LT |
920 | |
921 | if (v == SEQ_START_TOKEN) { | |
922 | seq_puts(seq, atm_arp_banner); | |
923 | } else { | |
924 | struct clip_seq_state *state = seq->private; | |
925 | struct neighbour *n = v; | |
926 | struct clip_vcc *vcc = state->vcc; | |
927 | ||
928 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
929 | } | |
e49e76db | 930 | return 0; |
1da177e4 LT |
931 | } |
932 | ||
933 | static struct seq_operations arp_seq_ops = { | |
934 | .start = clip_seq_start, | |
935 | .next = neigh_seq_next, | |
936 | .stop = neigh_seq_stop, | |
937 | .show = clip_seq_show, | |
938 | }; | |
939 | ||
940 | static int arp_seq_open(struct inode *inode, struct file *file) | |
941 | { | |
942 | struct clip_seq_state *state; | |
943 | struct seq_file *seq; | |
944 | int rc = -EAGAIN; | |
945 | ||
946 | state = kmalloc(sizeof(*state), GFP_KERNEL); | |
947 | if (!state) { | |
948 | rc = -ENOMEM; | |
949 | goto out_kfree; | |
950 | } | |
951 | memset(state, 0, sizeof(*state)); | |
952 | state->ns.neigh_sub_iter = clip_seq_sub_iter; | |
953 | ||
954 | rc = seq_open(file, &arp_seq_ops); | |
955 | if (rc) | |
956 | goto out_kfree; | |
957 | ||
958 | seq = file->private_data; | |
959 | seq->private = state; | |
960 | out: | |
961 | return rc; | |
962 | ||
963 | out_kfree: | |
964 | kfree(state); | |
965 | goto out; | |
966 | } | |
967 | ||
968 | static struct file_operations arp_seq_fops = { | |
969 | .open = arp_seq_open, | |
970 | .read = seq_read, | |
971 | .llseek = seq_lseek, | |
972 | .release = seq_release_private, | |
973 | .owner = THIS_MODULE | |
974 | }; | |
975 | #endif | |
976 | ||
977 | static int __init atm_clip_init(void) | |
978 | { | |
dcdb0275 | 979 | struct proc_dir_entry *p; |
1da177e4 LT |
980 | neigh_table_init(&clip_tbl); |
981 | ||
982 | clip_tbl_hook = &clip_tbl; | |
983 | register_atm_ioctl(&clip_ioctl_ops); | |
f3a0592b SH |
984 | register_netdevice_notifier(&clip_dev_notifier); |
985 | register_inetaddr_notifier(&clip_inet_notifier); | |
1da177e4 | 986 | |
2d907392 SH |
987 | setup_timer(&idle_timer, idle_timer_check, 0); |
988 | ||
dcdb0275 SH |
989 | p = create_proc_entry("arp", S_IRUGO, atm_proc_root); |
990 | if (p) | |
991 | p->proc_fops = &arp_seq_fops; | |
1da177e4 LT |
992 | |
993 | return 0; | |
994 | } | |
995 | ||
996 | static void __exit atm_clip_exit(void) | |
997 | { | |
998 | struct net_device *dev, *next; | |
999 | ||
1000 | remove_proc_entry("arp", atm_proc_root); | |
1001 | ||
f3a0592b SH |
1002 | unregister_inetaddr_notifier(&clip_inet_notifier); |
1003 | unregister_netdevice_notifier(&clip_dev_notifier); | |
1004 | ||
1da177e4 LT |
1005 | deregister_atm_ioctl(&clip_ioctl_ops); |
1006 | ||
1007 | /* First, stop the idle timer, so it stops banging | |
1008 | * on the table. | |
1009 | */ | |
2d907392 | 1010 | del_timer_sync(&idle_timer); |
1da177e4 LT |
1011 | |
1012 | /* Next, purge the table, so that the device | |
1013 | * unregister loop below does not hang due to | |
1014 | * device references remaining in the table. | |
1015 | */ | |
1016 | neigh_ifdown(&clip_tbl, NULL); | |
1017 | ||
1018 | dev = clip_devs; | |
1019 | while (dev) { | |
1020 | next = PRIV(dev)->next; | |
1021 | unregister_netdev(dev); | |
1022 | free_netdev(dev); | |
1023 | dev = next; | |
1024 | } | |
1025 | ||
1026 | /* Now it is safe to fully shutdown whole table. */ | |
1027 | neigh_table_clear(&clip_tbl); | |
1028 | ||
1029 | clip_tbl_hook = NULL; | |
1030 | } | |
1031 | ||
1032 | module_init(atm_clip_init); | |
1033 | module_exit(atm_clip_exit); | |
1034 | ||
1035 | MODULE_LICENSE("GPL"); |