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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 | ||
43 | ||
44 | #if 0 | |
45 | #define DPRINTK(format,args...) printk(format,##args) | |
46 | #else | |
47 | #define DPRINTK(format,args...) | |
48 | #endif | |
49 | ||
50 | ||
51 | static struct net_device *clip_devs; | |
52 | static struct atm_vcc *atmarpd; | |
53 | static struct neigh_table clip_tbl; | |
54 | static struct timer_list idle_timer; | |
1da177e4 | 55 | |
30d492da | 56 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) |
1da177e4 LT |
57 | { |
58 | struct sock *sk; | |
59 | struct atmarp_ctrl *ctrl; | |
60 | struct sk_buff *skb; | |
61 | ||
e49e76db SH |
62 | DPRINTK("to_atmarpd(%d)\n", type); |
63 | if (!atmarpd) | |
64 | return -EUNATCH; | |
1da177e4 | 65 | skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC); |
e49e76db SH |
66 | if (!skb) |
67 | return -ENOMEM; | |
1da177e4 LT |
68 | ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl)); |
69 | ctrl->type = type; | |
70 | ctrl->itf_num = itf; | |
71 | ctrl->ip = ip; | |
e49e76db | 72 | atm_force_charge(atmarpd, skb->truesize); |
1da177e4 LT |
73 | |
74 | sk = sk_atm(atmarpd); | |
75 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
76 | sk->sk_data_ready(sk, skb->len); | |
77 | return 0; | |
78 | } | |
79 | ||
e49e76db | 80 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
1da177e4 | 81 | { |
e49e76db SH |
82 | DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry, |
83 | entry->neigh); | |
1da177e4 | 84 | clip_vcc->entry = entry; |
e49e76db | 85 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
1da177e4 LT |
86 | clip_vcc->next = entry->vccs; |
87 | entry->vccs = clip_vcc; | |
88 | entry->neigh->used = jiffies; | |
89 | } | |
90 | ||
1da177e4 LT |
91 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
92 | { | |
93 | struct atmarp_entry *entry = clip_vcc->entry; | |
94 | struct clip_vcc **walk; | |
95 | ||
96 | if (!entry) { | |
e49e76db | 97 | printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); |
1da177e4 LT |
98 | return; |
99 | } | |
932ff279 | 100 | netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ |
1da177e4 LT |
101 | entry->neigh->used = jiffies; |
102 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) | |
103 | if (*walk == clip_vcc) { | |
104 | int error; | |
105 | ||
e49e76db | 106 | *walk = clip_vcc->next; /* atomic */ |
1da177e4 LT |
107 | clip_vcc->entry = NULL; |
108 | if (clip_vcc->xoff) | |
109 | netif_wake_queue(entry->neigh->dev); | |
110 | if (entry->vccs) | |
111 | goto out; | |
e49e76db SH |
112 | entry->expires = jiffies - 1; |
113 | /* force resolution or expiration */ | |
1da177e4 LT |
114 | error = neigh_update(entry->neigh, NULL, NUD_NONE, |
115 | NEIGH_UPDATE_F_ADMIN); | |
116 | if (error) | |
117 | printk(KERN_CRIT "unlink_clip_vcc: " | |
e49e76db | 118 | "neigh_update failed with %d\n", error); |
1da177e4 LT |
119 | goto out; |
120 | } | |
121 | printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc " | |
e49e76db SH |
122 | "0x%p)\n", entry, clip_vcc); |
123 | out: | |
932ff279 | 124 | netif_tx_unlock_bh(entry->neigh->dev); |
1da177e4 LT |
125 | } |
126 | ||
127 | /* The neighbour entry n->lock is held. */ | |
128 | static int neigh_check_cb(struct neighbour *n) | |
129 | { | |
130 | struct atmarp_entry *entry = NEIGH2ENTRY(n); | |
131 | struct clip_vcc *cv; | |
132 | ||
133 | for (cv = entry->vccs; cv; cv = cv->next) { | |
134 | unsigned long exp = cv->last_use + cv->idle_timeout; | |
135 | ||
136 | if (cv->idle_timeout && time_after(jiffies, exp)) { | |
137 | DPRINTK("releasing vcc %p->%p of entry %p\n", | |
138 | cv, cv->vcc, entry); | |
139 | vcc_release_async(cv->vcc, -ETIMEDOUT); | |
140 | } | |
141 | } | |
142 | ||
143 | if (entry->vccs || time_before(jiffies, entry->expires)) | |
144 | return 0; | |
145 | ||
146 | if (atomic_read(&n->refcnt) > 1) { | |
147 | struct sk_buff *skb; | |
148 | ||
149 | DPRINTK("destruction postponed with ref %d\n", | |
150 | atomic_read(&n->refcnt)); | |
151 | ||
e49e76db | 152 | while ((skb = skb_dequeue(&n->arp_queue)) != NULL) |
1da177e4 LT |
153 | dev_kfree_skb(skb); |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
e49e76db | 158 | DPRINTK("expired neigh %p\n", n); |
1da177e4 LT |
159 | return 1; |
160 | } | |
161 | ||
162 | static void idle_timer_check(unsigned long dummy) | |
163 | { | |
164 | write_lock(&clip_tbl.lock); | |
165 | __neigh_for_each_release(&clip_tbl, neigh_check_cb); | |
e49e76db | 166 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
1da177e4 LT |
167 | write_unlock(&clip_tbl.lock); |
168 | } | |
169 | ||
170 | static int clip_arp_rcv(struct sk_buff *skb) | |
171 | { | |
172 | struct atm_vcc *vcc; | |
173 | ||
174 | DPRINTK("clip_arp_rcv\n"); | |
175 | vcc = ATM_SKB(skb)->vcc; | |
e49e76db | 176 | if (!vcc || !atm_charge(vcc, skb->truesize)) { |
1da177e4 LT |
177 | dev_kfree_skb_any(skb); |
178 | return 0; | |
179 | } | |
e49e76db SH |
180 | DPRINTK("pushing to %p\n", vcc); |
181 | DPRINTK("using %p\n", CLIP_VCC(vcc)->old_push); | |
182 | CLIP_VCC(vcc)->old_push(vcc, skb); | |
1da177e4 LT |
183 | return 0; |
184 | } | |
185 | ||
186 | static const unsigned char llc_oui[] = { | |
187 | 0xaa, /* DSAP: non-ISO */ | |
188 | 0xaa, /* SSAP: non-ISO */ | |
189 | 0x03, /* Ctrl: Unnumbered Information Command PDU */ | |
190 | 0x00, /* OUI: EtherType */ | |
191 | 0x00, | |
e49e76db SH |
192 | 0x00 |
193 | }; | |
1da177e4 | 194 | |
e49e76db | 195 | static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
196 | { |
197 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
198 | ||
199 | DPRINTK("clip push\n"); | |
200 | if (!skb) { | |
e49e76db SH |
201 | DPRINTK("removing VCC %p\n", clip_vcc); |
202 | if (clip_vcc->entry) | |
203 | unlink_clip_vcc(clip_vcc); | |
204 | clip_vcc->old_push(vcc, NULL); /* pass on the bad news */ | |
1da177e4 LT |
205 | kfree(clip_vcc); |
206 | return; | |
207 | } | |
e49e76db | 208 | atm_return(vcc, skb->truesize); |
1da177e4 | 209 | skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs; |
e49e76db | 210 | /* clip_vcc->entry == NULL if we don't have an IP address yet */ |
1da177e4 LT |
211 | if (!skb->dev) { |
212 | dev_kfree_skb_any(skb); | |
213 | return; | |
214 | } | |
215 | ATM_SKB(skb)->vcc = vcc; | |
216 | skb->mac.raw = skb->data; | |
e49e76db SH |
217 | if (!clip_vcc->encap |
218 | || skb->len < RFC1483LLC_LEN | |
219 | || memcmp(skb->data, llc_oui, sizeof (llc_oui))) | |
220 | skb->protocol = htons(ETH_P_IP); | |
1da177e4 | 221 | else { |
30d492da | 222 | skb->protocol = ((__be16 *) skb->data)[3]; |
e49e76db | 223 | skb_pull(skb, RFC1483LLC_LEN); |
1da177e4 LT |
224 | if (skb->protocol == htons(ETH_P_ARP)) { |
225 | PRIV(skb->dev)->stats.rx_packets++; | |
226 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
227 | clip_arp_rcv(skb); | |
228 | return; | |
229 | } | |
230 | } | |
231 | clip_vcc->last_use = jiffies; | |
232 | PRIV(skb->dev)->stats.rx_packets++; | |
233 | PRIV(skb->dev)->stats.rx_bytes += skb->len; | |
234 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
235 | netif_rx(skb); | |
236 | } | |
237 | ||
1da177e4 LT |
238 | /* |
239 | * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that | |
240 | * clip_pop is atomic with respect to the critical section in clip_start_xmit. | |
241 | */ | |
242 | ||
e49e76db | 243 | static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
1da177e4 LT |
244 | { |
245 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
246 | struct net_device *dev = skb->dev; | |
247 | int old; | |
248 | unsigned long flags; | |
249 | ||
e49e76db SH |
250 | DPRINTK("clip_pop(vcc %p)\n", vcc); |
251 | clip_vcc->old_pop(vcc, skb); | |
1da177e4 | 252 | /* skb->dev == NULL in outbound ARP packets */ |
e49e76db SH |
253 | if (!dev) |
254 | return; | |
255 | spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags); | |
256 | if (atm_may_send(vcc, 0)) { | |
257 | old = xchg(&clip_vcc->xoff, 0); | |
258 | if (old) | |
259 | netif_wake_queue(dev); | |
1da177e4 | 260 | } |
e49e76db | 261 | spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags); |
1da177e4 LT |
262 | } |
263 | ||
1da177e4 LT |
264 | static void clip_neigh_destroy(struct neighbour *neigh) |
265 | { | |
e49e76db | 266 | DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh); |
1da177e4 LT |
267 | if (NEIGH2ENTRY(neigh)->vccs) |
268 | printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n"); | |
4bdbf6c0 | 269 | NEIGH2ENTRY(neigh)->vccs = (void *) NEIGHBOR_DEAD; |
1da177e4 LT |
270 | } |
271 | ||
e49e76db | 272 | static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 273 | { |
e49e76db SH |
274 | DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb); |
275 | to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip); | |
1da177e4 LT |
276 | } |
277 | ||
e49e76db | 278 | static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
279 | { |
280 | #ifndef CONFIG_ATM_CLIP_NO_ICMP | |
e49e76db | 281 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
1da177e4 LT |
282 | #endif |
283 | kfree_skb(skb); | |
284 | } | |
285 | ||
1da177e4 LT |
286 | static struct neigh_ops clip_neigh_ops = { |
287 | .family = AF_INET, | |
1da177e4 LT |
288 | .solicit = clip_neigh_solicit, |
289 | .error_report = clip_neigh_error, | |
290 | .output = dev_queue_xmit, | |
291 | .connected_output = dev_queue_xmit, | |
292 | .hh_output = dev_queue_xmit, | |
293 | .queue_xmit = dev_queue_xmit, | |
294 | }; | |
295 | ||
1da177e4 LT |
296 | static int clip_constructor(struct neighbour *neigh) |
297 | { | |
298 | struct atmarp_entry *entry = NEIGH2ENTRY(neigh); | |
299 | struct net_device *dev = neigh->dev; | |
300 | struct in_device *in_dev; | |
301 | struct neigh_parms *parms; | |
302 | ||
e49e76db | 303 | DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry); |
1da177e4 | 304 | neigh->type = inet_addr_type(entry->ip); |
e49e76db SH |
305 | if (neigh->type != RTN_UNICAST) |
306 | return -EINVAL; | |
1da177e4 LT |
307 | |
308 | rcu_read_lock(); | |
e5ed6399 | 309 | in_dev = __in_dev_get_rcu(dev); |
1da177e4 LT |
310 | if (!in_dev) { |
311 | rcu_read_unlock(); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | parms = in_dev->arp_parms; | |
316 | __neigh_parms_put(neigh->parms); | |
317 | neigh->parms = neigh_parms_clone(parms); | |
318 | rcu_read_unlock(); | |
319 | ||
320 | neigh->ops = &clip_neigh_ops; | |
321 | neigh->output = neigh->nud_state & NUD_VALID ? | |
322 | neigh->ops->connected_output : neigh->ops->output; | |
323 | entry->neigh = neigh; | |
324 | entry->vccs = NULL; | |
e49e76db | 325 | entry->expires = jiffies - 1; |
1da177e4 LT |
326 | return 0; |
327 | } | |
328 | ||
329 | static u32 clip_hash(const void *pkey, const struct net_device *dev) | |
330 | { | |
e49e76db | 331 | return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd); |
1da177e4 LT |
332 | } |
333 | ||
334 | static struct neigh_table clip_tbl = { | |
335 | .family = AF_INET, | |
336 | .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry), | |
337 | .key_len = 4, | |
338 | .hash = clip_hash, | |
339 | .constructor = clip_constructor, | |
340 | .id = "clip_arp_cache", | |
341 | ||
342 | /* parameters are copied from ARP ... */ | |
343 | .parms = { | |
344 | .tbl = &clip_tbl, | |
aa837b5b | 345 | .neigh_destructor = clip_neigh_destroy, |
1da177e4 LT |
346 | .base_reachable_time = 30 * HZ, |
347 | .retrans_time = 1 * HZ, | |
348 | .gc_staletime = 60 * HZ, | |
349 | .reachable_time = 30 * HZ, | |
350 | .delay_probe_time = 5 * HZ, | |
351 | .queue_len = 3, | |
352 | .ucast_probes = 3, | |
353 | .mcast_probes = 3, | |
354 | .anycast_delay = 1 * HZ, | |
355 | .proxy_delay = (8 * HZ) / 10, | |
356 | .proxy_qlen = 64, | |
357 | .locktime = 1 * HZ, | |
358 | }, | |
359 | .gc_interval = 30 * HZ, | |
360 | .gc_thresh1 = 128, | |
361 | .gc_thresh2 = 512, | |
362 | .gc_thresh3 = 1024, | |
363 | }; | |
364 | ||
1da177e4 LT |
365 | /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */ |
366 | ||
367 | /* | |
368 | * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means | |
369 | * to allocate the neighbour entry but not to ask atmarpd for resolution. Also, | |
370 | * don't increment the usage count. This is used to create entries in | |
371 | * clip_setentry. | |
372 | */ | |
373 | ||
e49e76db | 374 | static int clip_encap(struct atm_vcc *vcc, int mode) |
1da177e4 LT |
375 | { |
376 | CLIP_VCC(vcc)->encap = mode; | |
377 | return 0; | |
378 | } | |
379 | ||
e49e76db | 380 | static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
381 | { |
382 | struct clip_priv *clip_priv = PRIV(dev); | |
383 | struct atmarp_entry *entry; | |
384 | struct atm_vcc *vcc; | |
385 | int old; | |
386 | unsigned long flags; | |
387 | ||
e49e76db | 388 | DPRINTK("clip_start_xmit (skb %p)\n", skb); |
1da177e4 LT |
389 | if (!skb->dst) { |
390 | printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n"); | |
391 | dev_kfree_skb(skb); | |
392 | clip_priv->stats.tx_dropped++; | |
393 | return 0; | |
394 | } | |
395 | if (!skb->dst->neighbour) { | |
396 | #if 0 | |
e49e76db | 397 | skb->dst->neighbour = clip_find_neighbour(skb->dst, 1); |
1da177e4 | 398 | if (!skb->dst->neighbour) { |
e49e76db | 399 | dev_kfree_skb(skb); /* lost that one */ |
1da177e4 LT |
400 | clip_priv->stats.tx_dropped++; |
401 | return 0; | |
402 | } | |
403 | #endif | |
404 | printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n"); | |
405 | dev_kfree_skb(skb); | |
406 | clip_priv->stats.tx_dropped++; | |
407 | return 0; | |
408 | } | |
409 | entry = NEIGH2ENTRY(skb->dst->neighbour); | |
410 | if (!entry->vccs) { | |
411 | if (time_after(jiffies, entry->expires)) { | |
412 | /* should be resolved */ | |
e49e76db SH |
413 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
414 | to_atmarpd(act_need, PRIV(dev)->number, entry->ip); | |
1da177e4 LT |
415 | } |
416 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) | |
e49e76db | 417 | skb_queue_tail(&entry->neigh->arp_queue, skb); |
1da177e4 LT |
418 | else { |
419 | dev_kfree_skb(skb); | |
420 | clip_priv->stats.tx_dropped++; | |
421 | } | |
422 | return 0; | |
423 | } | |
e49e76db | 424 | DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs); |
1da177e4 | 425 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
e49e76db | 426 | DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc); |
1da177e4 LT |
427 | if (entry->vccs->encap) { |
428 | void *here; | |
429 | ||
e49e76db SH |
430 | here = skb_push(skb, RFC1483LLC_LEN); |
431 | memcpy(here, llc_oui, sizeof(llc_oui)); | |
30d492da | 432 | ((__be16 *) here)[3] = skb->protocol; |
1da177e4 LT |
433 | } |
434 | atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); | |
435 | ATM_SKB(skb)->atm_options = vcc->atm_options; | |
436 | entry->vccs->last_use = jiffies; | |
e49e76db SH |
437 | DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); |
438 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ | |
1da177e4 LT |
439 | if (old) { |
440 | printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n"); | |
441 | return 0; | |
442 | } | |
443 | clip_priv->stats.tx_packets++; | |
444 | clip_priv->stats.tx_bytes += skb->len; | |
5ff765f3 | 445 | vcc->send(vcc, skb); |
e49e76db | 446 | if (atm_may_send(vcc, 0)) { |
1da177e4 LT |
447 | entry->vccs->xoff = 0; |
448 | return 0; | |
449 | } | |
e49e76db SH |
450 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
451 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ | |
1da177e4 LT |
452 | barrier(); |
453 | if (!entry->vccs->xoff) | |
454 | netif_start_queue(dev); | |
e49e76db SH |
455 | /* Oh, we just raced with clip_pop. netif_start_queue should be |
456 | good enough, because nothing should really be asleep because | |
457 | of the brief netif_stop_queue. If this isn't true or if it | |
458 | changes, use netif_wake_queue instead. */ | |
459 | spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); | |
1da177e4 LT |
460 | return 0; |
461 | } | |
462 | ||
1da177e4 LT |
463 | static struct net_device_stats *clip_get_stats(struct net_device *dev) |
464 | { | |
465 | return &PRIV(dev)->stats; | |
466 | } | |
467 | ||
e49e76db | 468 | static int clip_mkip(struct atm_vcc *vcc, int timeout) |
1da177e4 LT |
469 | { |
470 | struct clip_vcc *clip_vcc; | |
1da177e4 | 471 | struct sk_buff *skb; |
c40a27f4 DM |
472 | struct sk_buff_head *rq; |
473 | unsigned long flags; | |
1da177e4 | 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; | |
c40a27f4 DM |
493 | |
494 | rq = &sk_atm(vcc)->sk_receive_queue; | |
495 | ||
496 | spin_lock_irqsave(&rq->lock, flags); | |
497 | if (skb_queue_empty(rq)) { | |
498 | skb = NULL; | |
499 | } else { | |
500 | /* NULL terminate the list. */ | |
501 | rq->prev->next = NULL; | |
502 | skb = rq->next; | |
503 | } | |
504 | rq->prev = rq->next = (struct sk_buff *)rq; | |
505 | rq->qlen = 0; | |
506 | spin_unlock_irqrestore(&rq->lock, flags); | |
507 | ||
1da177e4 | 508 | /* re-process everything received between connection setup and MKIP */ |
c40a27f4 DM |
509 | while (skb) { |
510 | struct sk_buff *next = skb->next; | |
511 | ||
512 | skb->next = skb->prev = NULL; | |
1da177e4 | 513 | if (!clip_devs) { |
e49e76db | 514 | atm_return(vcc, skb->truesize); |
1da177e4 | 515 | kfree_skb(skb); |
e49e76db | 516 | } else { |
1da177e4 LT |
517 | unsigned int len = skb->len; |
518 | ||
fe26109a | 519 | skb_get(skb); |
e49e76db | 520 | clip_push(vcc, skb); |
1da177e4 LT |
521 | PRIV(skb->dev)->stats.rx_packets--; |
522 | PRIV(skb->dev)->stats.rx_bytes -= len; | |
fe26109a | 523 | kfree_skb(skb); |
1da177e4 | 524 | } |
c40a27f4 DM |
525 | |
526 | skb = next; | |
527 | } | |
1da177e4 LT |
528 | return 0; |
529 | } | |
530 | ||
30d492da | 531 | static int clip_setentry(struct atm_vcc *vcc, __be32 ip) |
1da177e4 LT |
532 | { |
533 | struct neighbour *neigh; | |
534 | struct atmarp_entry *entry; | |
535 | int error; | |
536 | struct clip_vcc *clip_vcc; | |
e49e76db | 537 | struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} }; |
1da177e4 LT |
538 | struct rtable *rt; |
539 | ||
540 | if (vcc->push != clip_push) { | |
541 | printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n"); | |
542 | return -EBADF; | |
543 | } | |
544 | clip_vcc = CLIP_VCC(vcc); | |
545 | if (!ip) { | |
546 | if (!clip_vcc->entry) { | |
547 | printk(KERN_ERR "hiding hidden ATMARP entry\n"); | |
548 | return 0; | |
549 | } | |
550 | DPRINTK("setentry: remove\n"); | |
551 | unlink_clip_vcc(clip_vcc); | |
552 | return 0; | |
553 | } | |
e49e76db SH |
554 | error = ip_route_output_key(&rt, &fl); |
555 | if (error) | |
556 | return error; | |
557 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1); | |
1da177e4 LT |
558 | ip_rt_put(rt); |
559 | if (!neigh) | |
560 | return -ENOMEM; | |
561 | entry = NEIGH2ENTRY(neigh); | |
562 | if (entry != clip_vcc->entry) { | |
e49e76db SH |
563 | if (!clip_vcc->entry) |
564 | DPRINTK("setentry: add\n"); | |
1da177e4 LT |
565 | else { |
566 | DPRINTK("setentry: update\n"); | |
567 | unlink_clip_vcc(clip_vcc); | |
568 | } | |
e49e76db | 569 | link_vcc(clip_vcc, entry); |
1da177e4 | 570 | } |
e49e76db SH |
571 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, |
572 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
1da177e4 LT |
573 | neigh_release(neigh); |
574 | return error; | |
575 | } | |
576 | ||
1da177e4 LT |
577 | static void clip_setup(struct net_device *dev) |
578 | { | |
579 | dev->hard_start_xmit = clip_start_xmit; | |
580 | /* sg_xmit ... */ | |
581 | dev->get_stats = clip_get_stats; | |
582 | dev->type = ARPHRD_ATM; | |
583 | dev->hard_header_len = RFC1483LLC_LEN; | |
584 | dev->mtu = RFC1626_MTU; | |
e49e76db SH |
585 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
586 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
587 | /* length. tx_queue_len is only used for the default case, */ | |
588 | /* without any more elaborate queuing. 100 is a reasonable */ | |
589 | /* compromise between decent burst-tolerance and protection */ | |
590 | /* against memory hogs. */ | |
1da177e4 LT |
591 | } |
592 | ||
1da177e4 LT |
593 | static int clip_create(int number) |
594 | { | |
595 | struct net_device *dev; | |
596 | struct clip_priv *clip_priv; | |
597 | int error; | |
598 | ||
599 | if (number != -1) { | |
600 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
e49e76db SH |
601 | if (PRIV(dev)->number == number) |
602 | return -EEXIST; | |
603 | } else { | |
1da177e4 LT |
604 | number = 0; |
605 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
606 | if (PRIV(dev)->number >= number) | |
e49e76db | 607 | number = PRIV(dev)->number + 1; |
1da177e4 LT |
608 | } |
609 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
610 | if (!dev) | |
611 | return -ENOMEM; | |
612 | clip_priv = PRIV(dev); | |
e49e76db | 613 | sprintf(dev->name, "atm%d", number); |
1da177e4 LT |
614 | spin_lock_init(&clip_priv->xoff_lock); |
615 | clip_priv->number = number; | |
616 | error = register_netdev(dev); | |
617 | if (error) { | |
618 | free_netdev(dev); | |
619 | return error; | |
620 | } | |
621 | clip_priv->next = clip_devs; | |
622 | clip_devs = dev; | |
e49e76db | 623 | DPRINTK("registered (net:%s)\n", dev->name); |
1da177e4 LT |
624 | return number; |
625 | } | |
626 | ||
e49e76db | 627 | static int clip_device_event(struct notifier_block *this, unsigned long event, |
f3a0592b | 628 | void *arg) |
1da177e4 | 629 | { |
f3a0592b SH |
630 | struct net_device *dev = arg; |
631 | ||
632 | if (event == NETDEV_UNREGISTER) { | |
633 | neigh_ifdown(&clip_tbl, dev); | |
634 | return NOTIFY_DONE; | |
635 | } | |
636 | ||
1da177e4 | 637 | /* ignore non-CLIP devices */ |
f3a0592b | 638 | if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit) |
1da177e4 | 639 | return NOTIFY_DONE; |
f3a0592b | 640 | |
1da177e4 | 641 | switch (event) { |
e49e76db SH |
642 | case NETDEV_UP: |
643 | DPRINTK("clip_device_event NETDEV_UP\n"); | |
5ff765f3 | 644 | to_atmarpd(act_up, PRIV(dev)->number, 0); |
e49e76db SH |
645 | break; |
646 | case NETDEV_GOING_DOWN: | |
647 | DPRINTK("clip_device_event NETDEV_DOWN\n"); | |
5ff765f3 | 648 | to_atmarpd(act_down, PRIV(dev)->number, 0); |
e49e76db SH |
649 | break; |
650 | case NETDEV_CHANGE: | |
651 | case NETDEV_CHANGEMTU: | |
652 | DPRINTK("clip_device_event NETDEV_CHANGE*\n"); | |
5ff765f3 | 653 | to_atmarpd(act_change, PRIV(dev)->number, 0); |
e49e76db | 654 | break; |
1da177e4 LT |
655 | } |
656 | return NOTIFY_DONE; | |
657 | } | |
658 | ||
e49e76db SH |
659 | static int clip_inet_event(struct notifier_block *this, unsigned long event, |
660 | void *ifa) | |
1da177e4 LT |
661 | { |
662 | struct in_device *in_dev; | |
663 | ||
e49e76db | 664 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
1da177e4 LT |
665 | if (!in_dev || !in_dev->dev) { |
666 | printk(KERN_WARNING "clip_inet_event: no device\n"); | |
667 | return NOTIFY_DONE; | |
668 | } | |
669 | /* | |
670 | * Transitions are of the down-change-up type, so it's sufficient to | |
671 | * handle the change on up. | |
672 | */ | |
e49e76db SH |
673 | if (event != NETDEV_UP) |
674 | return NOTIFY_DONE; | |
675 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
1da177e4 LT |
676 | } |
677 | ||
678 | ||
679 | static struct notifier_block clip_dev_notifier = { | |
5ff765f3 | 680 | .notifier_call = clip_device_event, |
1da177e4 LT |
681 | }; |
682 | ||
683 | ||
684 | ||
685 | static struct notifier_block clip_inet_notifier = { | |
5ff765f3 | 686 | .notifier_call = clip_inet_event, |
1da177e4 LT |
687 | }; |
688 | ||
689 | ||
690 | ||
691 | static void atmarpd_close(struct atm_vcc *vcc) | |
692 | { | |
693 | DPRINTK("atmarpd_close\n"); | |
f3a0592b SH |
694 | |
695 | rtnl_lock(); | |
696 | atmarpd = NULL; | |
1da177e4 | 697 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); |
f3a0592b SH |
698 | rtnl_unlock(); |
699 | ||
1da177e4 LT |
700 | DPRINTK("(done)\n"); |
701 | module_put(THIS_MODULE); | |
702 | } | |
703 | ||
704 | ||
705 | static struct atmdev_ops atmarpd_dev_ops = { | |
706 | .close = atmarpd_close | |
707 | }; | |
708 | ||
709 | ||
710 | static struct atm_dev atmarpd_dev = { | |
711 | .ops = &atmarpd_dev_ops, | |
712 | .type = "arpd", | |
713 | .number = 999, | |
714 | .lock = SPIN_LOCK_UNLOCKED | |
715 | }; | |
716 | ||
717 | ||
718 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
719 | { | |
f3a0592b SH |
720 | rtnl_lock(); |
721 | if (atmarpd) { | |
722 | rtnl_unlock(); | |
723 | return -EADDRINUSE; | |
724 | } | |
725 | ||
2d907392 SH |
726 | mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ); |
727 | ||
1da177e4 LT |
728 | atmarpd = vcc; |
729 | set_bit(ATM_VF_META,&vcc->flags); | |
730 | set_bit(ATM_VF_READY,&vcc->flags); | |
731 | /* allow replies and avoid getting closed if signaling dies */ | |
732 | vcc->dev = &atmarpd_dev; | |
733 | vcc_insert_socket(sk_atm(vcc)); | |
734 | vcc->push = NULL; | |
735 | vcc->pop = NULL; /* crash */ | |
736 | vcc->push_oam = NULL; /* crash */ | |
f3a0592b | 737 | rtnl_unlock(); |
1da177e4 LT |
738 | return 0; |
739 | } | |
740 | ||
741 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
742 | { | |
743 | struct atm_vcc *vcc = ATM_SD(sock); | |
744 | int err = 0; | |
745 | ||
746 | switch (cmd) { | |
e49e76db SH |
747 | case SIOCMKCLIP: |
748 | case ATMARPD_CTRL: | |
749 | case ATMARP_MKIP: | |
750 | case ATMARP_SETENTRY: | |
751 | case ATMARP_ENCAP: | |
752 | if (!capable(CAP_NET_ADMIN)) | |
753 | return -EPERM; | |
754 | break; | |
755 | default: | |
756 | return -ENOIOCTLCMD; | |
1da177e4 LT |
757 | } |
758 | ||
759 | switch (cmd) { | |
e49e76db SH |
760 | case SIOCMKCLIP: |
761 | err = clip_create(arg); | |
762 | break; | |
763 | case ATMARPD_CTRL: | |
764 | err = atm_init_atmarp(vcc); | |
765 | if (!err) { | |
766 | sock->state = SS_CONNECTED; | |
767 | __module_get(THIS_MODULE); | |
768 | } | |
769 | break; | |
770 | case ATMARP_MKIP: | |
771 | err = clip_mkip(vcc, arg); | |
772 | break; | |
773 | case ATMARP_SETENTRY: | |
30d492da | 774 | err = clip_setentry(vcc, (__force __be32)arg); |
e49e76db SH |
775 | break; |
776 | case ATMARP_ENCAP: | |
777 | err = clip_encap(vcc, arg); | |
778 | break; | |
1da177e4 LT |
779 | } |
780 | return err; | |
781 | } | |
782 | ||
783 | static struct atm_ioctl clip_ioctl_ops = { | |
e49e76db SH |
784 | .owner = THIS_MODULE, |
785 | .ioctl = clip_ioctl, | |
1da177e4 LT |
786 | }; |
787 | ||
788 | #ifdef CONFIG_PROC_FS | |
789 | ||
790 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
791 | { | |
e49e76db SH |
792 | static int code[] = { 1, 2, 10, 6, 1, 0 }; |
793 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
1da177e4 LT |
794 | |
795 | if (*addr->sas_addr.pub) { | |
796 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
797 | if (*addr->sas_addr.prv) | |
798 | seq_putc(seq, '+'); | |
799 | } else if (!*addr->sas_addr.prv) { | |
800 | seq_printf(seq, "%s", "(none)"); | |
801 | return; | |
802 | } | |
803 | if (*addr->sas_addr.prv) { | |
804 | unsigned char *prv = addr->sas_addr.prv; | |
805 | int *fields; | |
806 | int i, j; | |
807 | ||
808 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
809 | for (i = 0; fields[i]; i++) { | |
810 | for (j = fields[i]; j; j--) | |
811 | seq_printf(seq, "%02X", *prv++); | |
e49e76db | 812 | if (fields[i + 1]) |
1da177e4 LT |
813 | seq_putc(seq, '.'); |
814 | } | |
815 | } | |
816 | } | |
817 | ||
818 | /* This means the neighbour entry has no attached VCC objects. */ | |
819 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
820 | ||
821 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
822 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
823 | { | |
824 | unsigned long exp; | |
825 | char buf[17]; | |
826 | int svc, llc, off; | |
827 | ||
828 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
829 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
830 | ||
e49e76db | 831 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
1da177e4 LT |
832 | |
833 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
834 | exp = entry->neigh->used; | |
835 | else | |
836 | exp = clip_vcc->last_use; | |
837 | ||
838 | exp = (jiffies - exp) / HZ; | |
839 | ||
840 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
e49e76db | 841 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); |
1da177e4 LT |
842 | |
843 | off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d", | |
844 | NIPQUAD(entry->ip)); | |
845 | while (off < 16) | |
846 | buf[off++] = ' '; | |
847 | buf[off] = '\0'; | |
848 | seq_printf(seq, "%s", buf); | |
849 | ||
850 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
851 | if (time_before(jiffies, entry->expires)) | |
852 | seq_printf(seq, "(resolving)\n"); | |
853 | else | |
854 | seq_printf(seq, "(expired, ref %d)\n", | |
855 | atomic_read(&entry->neigh->refcnt)); | |
856 | } else if (!svc) { | |
857 | seq_printf(seq, "%d.%d.%d\n", | |
858 | clip_vcc->vcc->dev->number, | |
e49e76db | 859 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
1da177e4 LT |
860 | } else { |
861 | svc_addr(seq, &clip_vcc->vcc->remote); | |
862 | seq_putc(seq, '\n'); | |
863 | } | |
864 | } | |
865 | ||
866 | struct clip_seq_state { | |
867 | /* This member must be first. */ | |
868 | struct neigh_seq_state ns; | |
869 | ||
870 | /* Local to clip specific iteration. */ | |
871 | struct clip_vcc *vcc; | |
872 | }; | |
873 | ||
874 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
875 | struct clip_vcc *curr) | |
876 | { | |
877 | if (!curr) { | |
878 | curr = e->vccs; | |
879 | if (!curr) | |
880 | return SEQ_NO_VCC_TOKEN; | |
881 | return curr; | |
882 | } | |
883 | if (curr == SEQ_NO_VCC_TOKEN) | |
884 | return NULL; | |
885 | ||
886 | curr = curr->next; | |
887 | ||
888 | return curr; | |
889 | } | |
890 | ||
891 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
e49e76db | 892 | struct atmarp_entry *e, loff_t * pos) |
1da177e4 LT |
893 | { |
894 | struct clip_vcc *vcc = state->vcc; | |
895 | ||
896 | vcc = clip_seq_next_vcc(e, vcc); | |
897 | if (vcc && pos != NULL) { | |
898 | while (*pos) { | |
899 | vcc = clip_seq_next_vcc(e, vcc); | |
900 | if (!vcc) | |
901 | break; | |
902 | --(*pos); | |
903 | } | |
904 | } | |
905 | state->vcc = vcc; | |
906 | ||
907 | return vcc; | |
908 | } | |
e49e76db | 909 | |
1da177e4 | 910 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
e49e76db | 911 | struct neighbour *n, loff_t * pos) |
1da177e4 | 912 | { |
e49e76db | 913 | struct clip_seq_state *state = (struct clip_seq_state *)_state; |
1da177e4 LT |
914 | |
915 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
916 | } | |
917 | ||
e49e76db | 918 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
1da177e4 LT |
919 | { |
920 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); | |
921 | } | |
922 | ||
923 | static int clip_seq_show(struct seq_file *seq, void *v) | |
924 | { | |
e49e76db SH |
925 | static char atm_arp_banner[] = |
926 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
1da177e4 LT |
927 | |
928 | if (v == SEQ_START_TOKEN) { | |
929 | seq_puts(seq, atm_arp_banner); | |
930 | } else { | |
931 | struct clip_seq_state *state = seq->private; | |
932 | struct neighbour *n = v; | |
933 | struct clip_vcc *vcc = state->vcc; | |
934 | ||
935 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
936 | } | |
e49e76db | 937 | return 0; |
1da177e4 LT |
938 | } |
939 | ||
940 | static struct seq_operations arp_seq_ops = { | |
941 | .start = clip_seq_start, | |
942 | .next = neigh_seq_next, | |
943 | .stop = neigh_seq_stop, | |
944 | .show = clip_seq_show, | |
945 | }; | |
946 | ||
947 | static int arp_seq_open(struct inode *inode, struct file *file) | |
948 | { | |
949 | struct clip_seq_state *state; | |
950 | struct seq_file *seq; | |
951 | int rc = -EAGAIN; | |
952 | ||
0da974f4 | 953 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
1da177e4 LT |
954 | if (!state) { |
955 | rc = -ENOMEM; | |
956 | goto out_kfree; | |
957 | } | |
1da177e4 LT |
958 | state->ns.neigh_sub_iter = clip_seq_sub_iter; |
959 | ||
960 | rc = seq_open(file, &arp_seq_ops); | |
961 | if (rc) | |
962 | goto out_kfree; | |
963 | ||
964 | seq = file->private_data; | |
965 | seq->private = state; | |
966 | out: | |
967 | return rc; | |
968 | ||
969 | out_kfree: | |
970 | kfree(state); | |
971 | goto out; | |
972 | } | |
973 | ||
974 | static struct file_operations arp_seq_fops = { | |
975 | .open = arp_seq_open, | |
976 | .read = seq_read, | |
977 | .llseek = seq_lseek, | |
978 | .release = seq_release_private, | |
979 | .owner = THIS_MODULE | |
980 | }; | |
981 | #endif | |
982 | ||
983 | static int __init atm_clip_init(void) | |
984 | { | |
bd89efc5 | 985 | neigh_table_init_no_netlink(&clip_tbl); |
1da177e4 LT |
986 | |
987 | clip_tbl_hook = &clip_tbl; | |
988 | register_atm_ioctl(&clip_ioctl_ops); | |
f3a0592b SH |
989 | register_netdevice_notifier(&clip_dev_notifier); |
990 | register_inetaddr_notifier(&clip_inet_notifier); | |
1da177e4 | 991 | |
2d907392 SH |
992 | setup_timer(&idle_timer, idle_timer_check, 0); |
993 | ||
24781734 AB |
994 | #ifdef CONFIG_PROC_FS |
995 | { | |
996 | struct proc_dir_entry *p; | |
997 | ||
998 | p = create_proc_entry("arp", S_IRUGO, atm_proc_root); | |
999 | if (p) | |
1000 | p->proc_fops = &arp_seq_fops; | |
1001 | } | |
1002 | #endif | |
1da177e4 LT |
1003 | |
1004 | return 0; | |
1005 | } | |
1006 | ||
1007 | static void __exit atm_clip_exit(void) | |
1008 | { | |
1009 | struct net_device *dev, *next; | |
1010 | ||
1011 | remove_proc_entry("arp", atm_proc_root); | |
1012 | ||
f3a0592b SH |
1013 | unregister_inetaddr_notifier(&clip_inet_notifier); |
1014 | unregister_netdevice_notifier(&clip_dev_notifier); | |
1015 | ||
1da177e4 LT |
1016 | deregister_atm_ioctl(&clip_ioctl_ops); |
1017 | ||
1018 | /* First, stop the idle timer, so it stops banging | |
1019 | * on the table. | |
1020 | */ | |
2d907392 | 1021 | del_timer_sync(&idle_timer); |
1da177e4 LT |
1022 | |
1023 | /* Next, purge the table, so that the device | |
1024 | * unregister loop below does not hang due to | |
1025 | * device references remaining in the table. | |
1026 | */ | |
1027 | neigh_ifdown(&clip_tbl, NULL); | |
1028 | ||
1029 | dev = clip_devs; | |
1030 | while (dev) { | |
1031 | next = PRIV(dev)->next; | |
1032 | unregister_netdev(dev); | |
1033 | free_netdev(dev); | |
1034 | dev = next; | |
1035 | } | |
1036 | ||
1037 | /* Now it is safe to fully shutdown whole table. */ | |
1038 | neigh_table_clear(&clip_tbl); | |
1039 | ||
1040 | clip_tbl_hook = NULL; | |
1041 | } | |
1042 | ||
1043 | module_init(atm_clip_init); | |
1044 | module_exit(atm_clip_exit); | |
4909e488 SH |
1045 | MODULE_AUTHOR("Werner Almesberger"); |
1046 | MODULE_DESCRIPTION("Classical/IP over ATM interface"); | |
1da177e4 | 1047 | MODULE_LICENSE("GPL"); |