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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 | ||
99824461 JP |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
6 | ||
1da177e4 LT |
7 | #include <linux/string.h> |
8 | #include <linux/errno.h> | |
9 | #include <linux/kernel.h> /* for UINT_MAX */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/netdevice.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/timer.h> | |
16 | #include <linux/if_arp.h> /* for some manifest constants */ | |
17 | #include <linux/notifier.h> | |
18 | #include <linux/atm.h> | |
19 | #include <linux/atmdev.h> | |
20 | #include <linux/atmclip.h> | |
21 | #include <linux/atmarp.h> | |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/ip.h> /* for net/route.h */ |
24 | #include <linux/in.h> /* for struct sockaddr_in */ | |
25 | #include <linux/if.h> /* for IFF_UP */ | |
26 | #include <linux/inetdevice.h> | |
27 | #include <linux/bitops.h> | |
4bdbf6c0 | 28 | #include <linux/poison.h> |
1da177e4 LT |
29 | #include <linux/proc_fs.h> |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/rcupdate.h> | |
32 | #include <linux/jhash.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | #include <net/route.h> /* for struct rtable and routing */ |
35 | #include <net/icmp.h> /* icmp_send */ | |
e956ea1b JP |
36 | #include <linux/param.h> /* for HZ */ |
37 | #include <linux/uaccess.h> | |
1da177e4 LT |
38 | #include <asm/byteorder.h> /* for htons etc. */ |
39 | #include <asm/system.h> /* save/restore_flags */ | |
1da177e4 LT |
40 | #include <asm/atomic.h> |
41 | ||
42 | #include "common.h" | |
43 | #include "resources.h" | |
1da177e4 LT |
44 | #include <net/atmclip.h> |
45 | ||
1da177e4 LT |
46 | static struct net_device *clip_devs; |
47 | static struct atm_vcc *atmarpd; | |
48 | static struct neigh_table clip_tbl; | |
49 | static struct timer_list idle_timer; | |
1da177e4 | 50 | |
30d492da | 51 | static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip) |
1da177e4 LT |
52 | { |
53 | struct sock *sk; | |
54 | struct atmarp_ctrl *ctrl; | |
55 | struct sk_buff *skb; | |
56 | ||
99824461 | 57 | pr_debug("(%d)\n", type); |
e49e76db SH |
58 | if (!atmarpd) |
59 | return -EUNATCH; | |
e956ea1b | 60 | skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC); |
e49e76db SH |
61 | if (!skb) |
62 | return -ENOMEM; | |
e956ea1b | 63 | ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl)); |
1da177e4 LT |
64 | ctrl->type = type; |
65 | ctrl->itf_num = itf; | |
66 | ctrl->ip = ip; | |
e49e76db | 67 | atm_force_charge(atmarpd, skb->truesize); |
1da177e4 LT |
68 | |
69 | sk = sk_atm(atmarpd); | |
70 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
71 | sk->sk_data_ready(sk, skb->len); | |
72 | return 0; | |
73 | } | |
74 | ||
e49e76db | 75 | static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry) |
1da177e4 | 76 | { |
99824461 | 77 | pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh); |
1da177e4 | 78 | clip_vcc->entry = entry; |
e49e76db | 79 | clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */ |
1da177e4 LT |
80 | clip_vcc->next = entry->vccs; |
81 | entry->vccs = clip_vcc; | |
82 | entry->neigh->used = jiffies; | |
83 | } | |
84 | ||
1da177e4 LT |
85 | static void unlink_clip_vcc(struct clip_vcc *clip_vcc) |
86 | { | |
87 | struct atmarp_entry *entry = clip_vcc->entry; | |
88 | struct clip_vcc **walk; | |
89 | ||
90 | if (!entry) { | |
99824461 | 91 | pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc); |
1da177e4 LT |
92 | return; |
93 | } | |
932ff279 | 94 | netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */ |
1da177e4 LT |
95 | entry->neigh->used = jiffies; |
96 | for (walk = &entry->vccs; *walk; walk = &(*walk)->next) | |
97 | if (*walk == clip_vcc) { | |
98 | int error; | |
99 | ||
e49e76db | 100 | *walk = clip_vcc->next; /* atomic */ |
1da177e4 LT |
101 | clip_vcc->entry = NULL; |
102 | if (clip_vcc->xoff) | |
103 | netif_wake_queue(entry->neigh->dev); | |
104 | if (entry->vccs) | |
105 | goto out; | |
e49e76db SH |
106 | entry->expires = jiffies - 1; |
107 | /* force resolution or expiration */ | |
1da177e4 LT |
108 | error = neigh_update(entry->neigh, NULL, NUD_NONE, |
109 | NEIGH_UPDATE_F_ADMIN); | |
110 | if (error) | |
99824461 | 111 | pr_crit("neigh_update failed with %d\n", error); |
1da177e4 LT |
112 | goto out; |
113 | } | |
99824461 | 114 | pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc); |
e956ea1b | 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", |
99824461 | 130 | cv, cv->vcc, entry); |
1da177e4 LT |
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", |
99824461 | 142 | atomic_read(&n->refcnt)); |
1da177e4 | 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 | ||
99824461 | 166 | pr_debug("\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 | ||
99824461 | 191 | pr_debug("\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); |
e956ea1b JP |
209 | if (!clip_vcc->encap || |
210 | skb->len < RFC1483LLC_LEN || | |
211 | memcmp(skb->data, llc_oui, sizeof(llc_oui))) | |
e49e76db | 212 | skb->protocol = htons(ETH_P_IP); |
1da177e4 | 213 | else { |
e956ea1b | 214 | skb->protocol = ((__be16 *)skb->data)[3]; |
e49e76db | 215 | skb_pull(skb, RFC1483LLC_LEN); |
1da177e4 | 216 | if (skb->protocol == htons(ETH_P_ARP)) { |
1a6afe8a SH |
217 | skb->dev->stats.rx_packets++; |
218 | skb->dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
219 | clip_arp_rcv(skb); |
220 | return; | |
221 | } | |
222 | } | |
223 | clip_vcc->last_use = jiffies; | |
1a6afe8a SH |
224 | skb->dev->stats.rx_packets++; |
225 | skb->dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
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 | ||
99824461 | 242 | pr_debug("(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 | { |
99824461 | 258 | pr_debug("(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 | ||
89d69d2b | 270 | static const struct neigh_ops clip_neigh_ops = { |
1da177e4 | 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 | ||
99824461 | 287 | pr_debug("(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 | ||
d6bf7817 | 313 | static u32 clip_hash(const void *pkey, const struct net_device *dev, __u32 rnd) |
1da177e4 | 314 | { |
d6bf7817 | 315 | return jhash_2words(*(u32 *) pkey, dev->ifindex, 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 | ||
3c805a22 SH |
363 | static netdev_tx_t clip_start_xmit(struct sk_buff *skb, |
364 | struct net_device *dev) | |
1da177e4 LT |
365 | { |
366 | struct clip_priv *clip_priv = PRIV(dev); | |
367 | struct atmarp_entry *entry; | |
368 | struct atm_vcc *vcc; | |
369 | int old; | |
370 | unsigned long flags; | |
371 | ||
99824461 | 372 | pr_debug("(skb %p)\n", skb); |
adf30907 | 373 | if (!skb_dst(skb)) { |
99824461 | 374 | pr_err("skb_dst(skb) == NULL\n"); |
1da177e4 | 375 | dev_kfree_skb(skb); |
1a6afe8a | 376 | dev->stats.tx_dropped++; |
6ed10654 | 377 | return NETDEV_TX_OK; |
1da177e4 | 378 | } |
adf30907 | 379 | if (!skb_dst(skb)->neighbour) { |
1da177e4 | 380 | #if 0 |
adf30907 ED |
381 | skb_dst(skb)->neighbour = clip_find_neighbour(skb_dst(skb), 1); |
382 | if (!skb_dst(skb)->neighbour) { | |
e49e76db | 383 | dev_kfree_skb(skb); /* lost that one */ |
1a6afe8a | 384 | dev->stats.tx_dropped++; |
1da177e4 LT |
385 | return 0; |
386 | } | |
387 | #endif | |
99824461 | 388 | pr_err("NO NEIGHBOUR !\n"); |
1da177e4 | 389 | dev_kfree_skb(skb); |
1a6afe8a | 390 | dev->stats.tx_dropped++; |
6ed10654 | 391 | return NETDEV_TX_OK; |
1da177e4 | 392 | } |
adf30907 | 393 | entry = NEIGH2ENTRY(skb_dst(skb)->neighbour); |
1da177e4 LT |
394 | if (!entry->vccs) { |
395 | if (time_after(jiffies, entry->expires)) { | |
396 | /* should be resolved */ | |
e49e76db SH |
397 | entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ; |
398 | to_atmarpd(act_need, PRIV(dev)->number, entry->ip); | |
1da177e4 LT |
399 | } |
400 | if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS) | |
e49e76db | 401 | skb_queue_tail(&entry->neigh->arp_queue, skb); |
1da177e4 LT |
402 | else { |
403 | dev_kfree_skb(skb); | |
1a6afe8a | 404 | dev->stats.tx_dropped++; |
1da177e4 | 405 | } |
6ed10654 | 406 | return NETDEV_TX_OK; |
1da177e4 | 407 | } |
52240062 | 408 | pr_debug("neigh %p, vccs %p\n", entry, entry->vccs); |
1da177e4 | 409 | ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc; |
adf30907 | 410 | pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb)->neighbour, vcc); |
1da177e4 LT |
411 | if (entry->vccs->encap) { |
412 | void *here; | |
413 | ||
e49e76db SH |
414 | here = skb_push(skb, RFC1483LLC_LEN); |
415 | memcpy(here, llc_oui, sizeof(llc_oui)); | |
30d492da | 416 | ((__be16 *) here)[3] = skb->protocol; |
1da177e4 LT |
417 | } |
418 | atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc); | |
419 | ATM_SKB(skb)->atm_options = vcc->atm_options; | |
420 | entry->vccs->last_use = jiffies; | |
52240062 | 421 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev); |
e49e76db | 422 | old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */ |
1da177e4 | 423 | if (old) { |
99824461 | 424 | pr_warning("XOFF->XOFF transition\n"); |
6ed10654 | 425 | return NETDEV_TX_OK; |
1da177e4 | 426 | } |
1a6afe8a SH |
427 | dev->stats.tx_packets++; |
428 | dev->stats.tx_bytes += skb->len; | |
5ff765f3 | 429 | vcc->send(vcc, skb); |
e49e76db | 430 | if (atm_may_send(vcc, 0)) { |
1da177e4 | 431 | entry->vccs->xoff = 0; |
6ed10654 | 432 | return NETDEV_TX_OK; |
1da177e4 | 433 | } |
e49e76db SH |
434 | spin_lock_irqsave(&clip_priv->xoff_lock, flags); |
435 | netif_stop_queue(dev); /* XOFF -> throttle immediately */ | |
1da177e4 LT |
436 | barrier(); |
437 | if (!entry->vccs->xoff) | |
438 | netif_start_queue(dev); | |
e49e76db SH |
439 | /* Oh, we just raced with clip_pop. netif_start_queue should be |
440 | good enough, because nothing should really be asleep because | |
441 | of the brief netif_stop_queue. If this isn't true or if it | |
442 | changes, use netif_wake_queue instead. */ | |
443 | spin_unlock_irqrestore(&clip_priv->xoff_lock, flags); | |
6ed10654 | 444 | return NETDEV_TX_OK; |
1da177e4 LT |
445 | } |
446 | ||
e49e76db | 447 | static int clip_mkip(struct atm_vcc *vcc, int timeout) |
1da177e4 | 448 | { |
b6211ae7 | 449 | struct sk_buff_head *rq, queue; |
1da177e4 | 450 | struct clip_vcc *clip_vcc; |
b6211ae7 | 451 | struct sk_buff *skb, *tmp; |
c40a27f4 | 452 | unsigned long flags; |
1da177e4 | 453 | |
e49e76db SH |
454 | if (!vcc->push) |
455 | return -EBADFD; | |
456 | clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL); | |
457 | if (!clip_vcc) | |
458 | return -ENOMEM; | |
99824461 | 459 | pr_debug("%p vcc %p\n", clip_vcc, vcc); |
1da177e4 LT |
460 | clip_vcc->vcc = vcc; |
461 | vcc->user_back = clip_vcc; | |
462 | set_bit(ATM_VF_IS_CLIP, &vcc->flags); | |
463 | clip_vcc->entry = NULL; | |
464 | clip_vcc->xoff = 0; | |
465 | clip_vcc->encap = 1; | |
466 | clip_vcc->last_use = jiffies; | |
e49e76db | 467 | clip_vcc->idle_timeout = timeout * HZ; |
1da177e4 LT |
468 | clip_vcc->old_push = vcc->push; |
469 | clip_vcc->old_pop = vcc->pop; | |
470 | vcc->push = clip_push; | |
471 | vcc->pop = clip_pop; | |
c40a27f4 | 472 | |
b6211ae7 | 473 | __skb_queue_head_init(&queue); |
c40a27f4 DM |
474 | rq = &sk_atm(vcc)->sk_receive_queue; |
475 | ||
476 | spin_lock_irqsave(&rq->lock, flags); | |
b6211ae7 | 477 | skb_queue_splice_init(rq, &queue); |
c40a27f4 DM |
478 | spin_unlock_irqrestore(&rq->lock, flags); |
479 | ||
1da177e4 | 480 | /* re-process everything received between connection setup and MKIP */ |
b6211ae7 | 481 | skb_queue_walk_safe(&queue, skb, tmp) { |
1da177e4 | 482 | if (!clip_devs) { |
e49e76db | 483 | atm_return(vcc, skb->truesize); |
1da177e4 | 484 | kfree_skb(skb); |
e49e76db | 485 | } else { |
b6211ae7 | 486 | struct net_device *dev = skb->dev; |
1da177e4 LT |
487 | unsigned int len = skb->len; |
488 | ||
fe26109a | 489 | skb_get(skb); |
e49e76db | 490 | clip_push(vcc, skb); |
b6211ae7 DM |
491 | dev->stats.rx_packets--; |
492 | dev->stats.rx_bytes -= len; | |
fe26109a | 493 | kfree_skb(skb); |
1da177e4 | 494 | } |
c40a27f4 | 495 | } |
1da177e4 LT |
496 | return 0; |
497 | } | |
498 | ||
30d492da | 499 | static int clip_setentry(struct atm_vcc *vcc, __be32 ip) |
1da177e4 LT |
500 | { |
501 | struct neighbour *neigh; | |
502 | struct atmarp_entry *entry; | |
503 | int error; | |
504 | struct clip_vcc *clip_vcc; | |
5811662b CG |
505 | struct flowi fl = { .fl4_dst = ip, |
506 | .fl4_tos = 1 }; | |
1da177e4 LT |
507 | struct rtable *rt; |
508 | ||
509 | if (vcc->push != clip_push) { | |
99824461 | 510 | pr_warning("non-CLIP VCC\n"); |
1da177e4 LT |
511 | return -EBADF; |
512 | } | |
513 | clip_vcc = CLIP_VCC(vcc); | |
514 | if (!ip) { | |
515 | if (!clip_vcc->entry) { | |
99824461 | 516 | pr_err("hiding hidden ATMARP entry\n"); |
1da177e4 LT |
517 | return 0; |
518 | } | |
99824461 | 519 | pr_debug("remove\n"); |
1da177e4 LT |
520 | unlink_clip_vcc(clip_vcc); |
521 | return 0; | |
522 | } | |
b23dd4fe DM |
523 | rt = ip_route_output_key(&init_net, &fl); |
524 | if (IS_ERR(rt)) | |
525 | return PTR_ERR(rt); | |
d8d1f30b | 526 | neigh = __neigh_lookup(&clip_tbl, &ip, rt->dst.dev, 1); |
1da177e4 LT |
527 | ip_rt_put(rt); |
528 | if (!neigh) | |
529 | return -ENOMEM; | |
530 | entry = NEIGH2ENTRY(neigh); | |
531 | if (entry != clip_vcc->entry) { | |
e49e76db | 532 | if (!clip_vcc->entry) |
99824461 | 533 | pr_debug("add\n"); |
1da177e4 | 534 | else { |
99824461 | 535 | pr_debug("update\n"); |
1da177e4 LT |
536 | unlink_clip_vcc(clip_vcc); |
537 | } | |
e49e76db | 538 | link_vcc(clip_vcc, entry); |
1da177e4 | 539 | } |
e49e76db SH |
540 | error = neigh_update(neigh, llc_oui, NUD_PERMANENT, |
541 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN); | |
1da177e4 LT |
542 | neigh_release(neigh); |
543 | return error; | |
544 | } | |
545 | ||
dde09758 SH |
546 | static const struct net_device_ops clip_netdev_ops = { |
547 | .ndo_start_xmit = clip_start_xmit, | |
548 | }; | |
549 | ||
1da177e4 LT |
550 | static void clip_setup(struct net_device *dev) |
551 | { | |
dde09758 | 552 | dev->netdev_ops = &clip_netdev_ops; |
1da177e4 LT |
553 | dev->type = ARPHRD_ATM; |
554 | dev->hard_header_len = RFC1483LLC_LEN; | |
555 | dev->mtu = RFC1626_MTU; | |
e49e76db SH |
556 | dev->tx_queue_len = 100; /* "normal" queue (packets) */ |
557 | /* When using a "real" qdisc, the qdisc determines the queue */ | |
558 | /* length. tx_queue_len is only used for the default case, */ | |
559 | /* without any more elaborate queuing. 100 is a reasonable */ | |
560 | /* compromise between decent burst-tolerance and protection */ | |
561 | /* against memory hogs. */ | |
a489e51c | 562 | dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
563 | } |
564 | ||
1da177e4 LT |
565 | static int clip_create(int number) |
566 | { | |
567 | struct net_device *dev; | |
568 | struct clip_priv *clip_priv; | |
569 | int error; | |
570 | ||
571 | if (number != -1) { | |
572 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
e49e76db SH |
573 | if (PRIV(dev)->number == number) |
574 | return -EEXIST; | |
575 | } else { | |
1da177e4 LT |
576 | number = 0; |
577 | for (dev = clip_devs; dev; dev = PRIV(dev)->next) | |
578 | if (PRIV(dev)->number >= number) | |
e49e76db | 579 | number = PRIV(dev)->number + 1; |
1da177e4 LT |
580 | } |
581 | dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup); | |
582 | if (!dev) | |
583 | return -ENOMEM; | |
584 | clip_priv = PRIV(dev); | |
e49e76db | 585 | sprintf(dev->name, "atm%d", number); |
1da177e4 LT |
586 | spin_lock_init(&clip_priv->xoff_lock); |
587 | clip_priv->number = number; | |
588 | error = register_netdev(dev); | |
589 | if (error) { | |
590 | free_netdev(dev); | |
591 | return error; | |
592 | } | |
593 | clip_priv->next = clip_devs; | |
594 | clip_devs = dev; | |
52240062 | 595 | pr_debug("registered (net:%s)\n", dev->name); |
1da177e4 LT |
596 | return number; |
597 | } | |
598 | ||
e49e76db | 599 | static int clip_device_event(struct notifier_block *this, unsigned long event, |
f3a0592b | 600 | void *arg) |
1da177e4 | 601 | { |
f3a0592b SH |
602 | struct net_device *dev = arg; |
603 | ||
721499e8 | 604 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
605 | return NOTIFY_DONE; |
606 | ||
f3a0592b SH |
607 | if (event == NETDEV_UNREGISTER) { |
608 | neigh_ifdown(&clip_tbl, dev); | |
609 | return NOTIFY_DONE; | |
610 | } | |
611 | ||
1da177e4 | 612 | /* ignore non-CLIP devices */ |
dde09758 | 613 | if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops) |
1da177e4 | 614 | return NOTIFY_DONE; |
f3a0592b | 615 | |
1da177e4 | 616 | switch (event) { |
e49e76db | 617 | case NETDEV_UP: |
99824461 | 618 | pr_debug("NETDEV_UP\n"); |
5ff765f3 | 619 | to_atmarpd(act_up, PRIV(dev)->number, 0); |
e49e76db SH |
620 | break; |
621 | case NETDEV_GOING_DOWN: | |
99824461 | 622 | pr_debug("NETDEV_DOWN\n"); |
5ff765f3 | 623 | to_atmarpd(act_down, PRIV(dev)->number, 0); |
e49e76db SH |
624 | break; |
625 | case NETDEV_CHANGE: | |
626 | case NETDEV_CHANGEMTU: | |
99824461 | 627 | pr_debug("NETDEV_CHANGE*\n"); |
5ff765f3 | 628 | to_atmarpd(act_change, PRIV(dev)->number, 0); |
e49e76db | 629 | break; |
1da177e4 LT |
630 | } |
631 | return NOTIFY_DONE; | |
632 | } | |
633 | ||
e49e76db SH |
634 | static int clip_inet_event(struct notifier_block *this, unsigned long event, |
635 | void *ifa) | |
1da177e4 LT |
636 | { |
637 | struct in_device *in_dev; | |
638 | ||
e49e76db | 639 | in_dev = ((struct in_ifaddr *)ifa)->ifa_dev; |
1da177e4 LT |
640 | /* |
641 | * Transitions are of the down-change-up type, so it's sufficient to | |
642 | * handle the change on up. | |
643 | */ | |
e49e76db SH |
644 | if (event != NETDEV_UP) |
645 | return NOTIFY_DONE; | |
646 | return clip_device_event(this, NETDEV_CHANGE, in_dev->dev); | |
1da177e4 LT |
647 | } |
648 | ||
1da177e4 | 649 | static struct notifier_block clip_dev_notifier = { |
5ff765f3 | 650 | .notifier_call = clip_device_event, |
1da177e4 LT |
651 | }; |
652 | ||
653 | ||
654 | ||
655 | static struct notifier_block clip_inet_notifier = { | |
5ff765f3 | 656 | .notifier_call = clip_inet_event, |
1da177e4 LT |
657 | }; |
658 | ||
659 | ||
660 | ||
661 | static void atmarpd_close(struct atm_vcc *vcc) | |
662 | { | |
99824461 | 663 | pr_debug("\n"); |
f3a0592b SH |
664 | |
665 | rtnl_lock(); | |
666 | atmarpd = NULL; | |
1da177e4 | 667 | skb_queue_purge(&sk_atm(vcc)->sk_receive_queue); |
f3a0592b SH |
668 | rtnl_unlock(); |
669 | ||
52240062 | 670 | pr_debug("(done)\n"); |
1da177e4 LT |
671 | module_put(THIS_MODULE); |
672 | } | |
673 | ||
1da177e4 LT |
674 | static struct atmdev_ops atmarpd_dev_ops = { |
675 | .close = atmarpd_close | |
676 | }; | |
677 | ||
678 | ||
679 | static struct atm_dev atmarpd_dev = { | |
680 | .ops = &atmarpd_dev_ops, | |
681 | .type = "arpd", | |
682 | .number = 999, | |
4ef8d0ae | 683 | .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock) |
1da177e4 LT |
684 | }; |
685 | ||
686 | ||
687 | static int atm_init_atmarp(struct atm_vcc *vcc) | |
688 | { | |
f3a0592b SH |
689 | rtnl_lock(); |
690 | if (atmarpd) { | |
691 | rtnl_unlock(); | |
692 | return -EADDRINUSE; | |
693 | } | |
694 | ||
e956ea1b | 695 | mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ); |
2d907392 | 696 | |
1da177e4 | 697 | atmarpd = vcc; |
e956ea1b JP |
698 | set_bit(ATM_VF_META, &vcc->flags); |
699 | set_bit(ATM_VF_READY, &vcc->flags); | |
1da177e4 LT |
700 | /* allow replies and avoid getting closed if signaling dies */ |
701 | vcc->dev = &atmarpd_dev; | |
702 | vcc_insert_socket(sk_atm(vcc)); | |
703 | vcc->push = NULL; | |
704 | vcc->pop = NULL; /* crash */ | |
705 | vcc->push_oam = NULL; /* crash */ | |
f3a0592b | 706 | rtnl_unlock(); |
1da177e4 LT |
707 | return 0; |
708 | } | |
709 | ||
710 | static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
711 | { | |
712 | struct atm_vcc *vcc = ATM_SD(sock); | |
713 | int err = 0; | |
714 | ||
715 | switch (cmd) { | |
e49e76db SH |
716 | case SIOCMKCLIP: |
717 | case ATMARPD_CTRL: | |
718 | case ATMARP_MKIP: | |
719 | case ATMARP_SETENTRY: | |
720 | case ATMARP_ENCAP: | |
721 | if (!capable(CAP_NET_ADMIN)) | |
722 | return -EPERM; | |
723 | break; | |
724 | default: | |
725 | return -ENOIOCTLCMD; | |
1da177e4 LT |
726 | } |
727 | ||
728 | switch (cmd) { | |
e49e76db SH |
729 | case SIOCMKCLIP: |
730 | err = clip_create(arg); | |
731 | break; | |
732 | case ATMARPD_CTRL: | |
733 | err = atm_init_atmarp(vcc); | |
734 | if (!err) { | |
735 | sock->state = SS_CONNECTED; | |
736 | __module_get(THIS_MODULE); | |
737 | } | |
738 | break; | |
739 | case ATMARP_MKIP: | |
740 | err = clip_mkip(vcc, arg); | |
741 | break; | |
742 | case ATMARP_SETENTRY: | |
30d492da | 743 | err = clip_setentry(vcc, (__force __be32)arg); |
e49e76db SH |
744 | break; |
745 | case ATMARP_ENCAP: | |
746 | err = clip_encap(vcc, arg); | |
747 | break; | |
1da177e4 LT |
748 | } |
749 | return err; | |
750 | } | |
751 | ||
752 | static struct atm_ioctl clip_ioctl_ops = { | |
e49e76db SH |
753 | .owner = THIS_MODULE, |
754 | .ioctl = clip_ioctl, | |
1da177e4 LT |
755 | }; |
756 | ||
757 | #ifdef CONFIG_PROC_FS | |
758 | ||
759 | static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr) | |
760 | { | |
e49e76db SH |
761 | static int code[] = { 1, 2, 10, 6, 1, 0 }; |
762 | static int e164[] = { 1, 8, 4, 6, 1, 0 }; | |
1da177e4 LT |
763 | |
764 | if (*addr->sas_addr.pub) { | |
765 | seq_printf(seq, "%s", addr->sas_addr.pub); | |
766 | if (*addr->sas_addr.prv) | |
767 | seq_putc(seq, '+'); | |
768 | } else if (!*addr->sas_addr.prv) { | |
769 | seq_printf(seq, "%s", "(none)"); | |
770 | return; | |
771 | } | |
772 | if (*addr->sas_addr.prv) { | |
773 | unsigned char *prv = addr->sas_addr.prv; | |
774 | int *fields; | |
775 | int i, j; | |
776 | ||
777 | fields = *prv == ATM_AFI_E164 ? e164 : code; | |
778 | for (i = 0; fields[i]; i++) { | |
779 | for (j = fields[i]; j; j--) | |
780 | seq_printf(seq, "%02X", *prv++); | |
e49e76db | 781 | if (fields[i + 1]) |
1da177e4 LT |
782 | seq_putc(seq, '.'); |
783 | } | |
784 | } | |
785 | } | |
786 | ||
787 | /* This means the neighbour entry has no attached VCC objects. */ | |
788 | #define SEQ_NO_VCC_TOKEN ((void *) 2) | |
789 | ||
790 | static void atmarp_info(struct seq_file *seq, struct net_device *dev, | |
791 | struct atmarp_entry *entry, struct clip_vcc *clip_vcc) | |
792 | { | |
793 | unsigned long exp; | |
794 | char buf[17]; | |
795 | int svc, llc, off; | |
796 | ||
797 | svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || | |
798 | (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC)); | |
799 | ||
e49e76db | 800 | llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap); |
1da177e4 LT |
801 | |
802 | if (clip_vcc == SEQ_NO_VCC_TOKEN) | |
803 | exp = entry->neigh->used; | |
804 | else | |
805 | exp = clip_vcc->last_use; | |
806 | ||
807 | exp = (jiffies - exp) / HZ; | |
808 | ||
809 | seq_printf(seq, "%-6s%-4s%-4s%5ld ", | |
e49e76db | 810 | dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp); |
1da177e4 | 811 | |
21454aaa HH |
812 | off = scnprintf(buf, sizeof(buf) - 1, "%pI4", |
813 | &entry->ip); | |
1da177e4 LT |
814 | while (off < 16) |
815 | buf[off++] = ' '; | |
816 | buf[off] = '\0'; | |
817 | seq_printf(seq, "%s", buf); | |
818 | ||
819 | if (clip_vcc == SEQ_NO_VCC_TOKEN) { | |
820 | if (time_before(jiffies, entry->expires)) | |
821 | seq_printf(seq, "(resolving)\n"); | |
822 | else | |
823 | seq_printf(seq, "(expired, ref %d)\n", | |
824 | atomic_read(&entry->neigh->refcnt)); | |
825 | } else if (!svc) { | |
826 | seq_printf(seq, "%d.%d.%d\n", | |
827 | clip_vcc->vcc->dev->number, | |
e49e76db | 828 | clip_vcc->vcc->vpi, clip_vcc->vcc->vci); |
1da177e4 LT |
829 | } else { |
830 | svc_addr(seq, &clip_vcc->vcc->remote); | |
831 | seq_putc(seq, '\n'); | |
832 | } | |
833 | } | |
834 | ||
835 | struct clip_seq_state { | |
836 | /* This member must be first. */ | |
837 | struct neigh_seq_state ns; | |
838 | ||
839 | /* Local to clip specific iteration. */ | |
840 | struct clip_vcc *vcc; | |
841 | }; | |
842 | ||
843 | static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e, | |
844 | struct clip_vcc *curr) | |
845 | { | |
846 | if (!curr) { | |
847 | curr = e->vccs; | |
848 | if (!curr) | |
849 | return SEQ_NO_VCC_TOKEN; | |
850 | return curr; | |
851 | } | |
852 | if (curr == SEQ_NO_VCC_TOKEN) | |
853 | return NULL; | |
854 | ||
855 | curr = curr->next; | |
856 | ||
857 | return curr; | |
858 | } | |
859 | ||
860 | static void *clip_seq_vcc_walk(struct clip_seq_state *state, | |
e49e76db | 861 | struct atmarp_entry *e, loff_t * pos) |
1da177e4 LT |
862 | { |
863 | struct clip_vcc *vcc = state->vcc; | |
864 | ||
865 | vcc = clip_seq_next_vcc(e, vcc); | |
866 | if (vcc && pos != NULL) { | |
867 | while (*pos) { | |
868 | vcc = clip_seq_next_vcc(e, vcc); | |
869 | if (!vcc) | |
870 | break; | |
871 | --(*pos); | |
872 | } | |
873 | } | |
874 | state->vcc = vcc; | |
875 | ||
876 | return vcc; | |
877 | } | |
e49e76db | 878 | |
1da177e4 | 879 | static void *clip_seq_sub_iter(struct neigh_seq_state *_state, |
e49e76db | 880 | struct neighbour *n, loff_t * pos) |
1da177e4 | 881 | { |
e49e76db | 882 | struct clip_seq_state *state = (struct clip_seq_state *)_state; |
1da177e4 LT |
883 | |
884 | return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos); | |
885 | } | |
886 | ||
e49e76db | 887 | static void *clip_seq_start(struct seq_file *seq, loff_t * pos) |
1da177e4 | 888 | { |
ae22120a DL |
889 | struct clip_seq_state *state = seq->private; |
890 | state->ns.neigh_sub_iter = clip_seq_sub_iter; | |
1da177e4 LT |
891 | return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY); |
892 | } | |
893 | ||
894 | static int clip_seq_show(struct seq_file *seq, void *v) | |
895 | { | |
e49e76db SH |
896 | static char atm_arp_banner[] = |
897 | "IPitf TypeEncp Idle IP address ATM address\n"; | |
1da177e4 LT |
898 | |
899 | if (v == SEQ_START_TOKEN) { | |
900 | seq_puts(seq, atm_arp_banner); | |
901 | } else { | |
902 | struct clip_seq_state *state = seq->private; | |
903 | struct neighbour *n = v; | |
904 | struct clip_vcc *vcc = state->vcc; | |
905 | ||
906 | atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc); | |
907 | } | |
e49e76db | 908 | return 0; |
1da177e4 LT |
909 | } |
910 | ||
56b3d975 | 911 | static const struct seq_operations arp_seq_ops = { |
1da177e4 LT |
912 | .start = clip_seq_start, |
913 | .next = neigh_seq_next, | |
914 | .stop = neigh_seq_stop, | |
915 | .show = clip_seq_show, | |
916 | }; | |
917 | ||
918 | static int arp_seq_open(struct inode *inode, struct file *file) | |
919 | { | |
ae22120a DL |
920 | return seq_open_net(inode, file, &arp_seq_ops, |
921 | sizeof(struct clip_seq_state)); | |
426b5303 EB |
922 | } |
923 | ||
9a32144e | 924 | static const struct file_operations arp_seq_fops = { |
1da177e4 LT |
925 | .open = arp_seq_open, |
926 | .read = seq_read, | |
927 | .llseek = seq_lseek, | |
ae22120a | 928 | .release = seq_release_net, |
1da177e4 LT |
929 | .owner = THIS_MODULE |
930 | }; | |
931 | #endif | |
932 | ||
dbee0d3f WC |
933 | static void atm_clip_exit_noproc(void); |
934 | ||
1da177e4 LT |
935 | static int __init atm_clip_init(void) |
936 | { | |
bd89efc5 | 937 | neigh_table_init_no_netlink(&clip_tbl); |
1da177e4 LT |
938 | |
939 | clip_tbl_hook = &clip_tbl; | |
940 | register_atm_ioctl(&clip_ioctl_ops); | |
f3a0592b SH |
941 | register_netdevice_notifier(&clip_dev_notifier); |
942 | register_inetaddr_notifier(&clip_inet_notifier); | |
1da177e4 | 943 | |
2d907392 SH |
944 | setup_timer(&idle_timer, idle_timer_check, 0); |
945 | ||
24781734 AB |
946 | #ifdef CONFIG_PROC_FS |
947 | { | |
948 | struct proc_dir_entry *p; | |
949 | ||
16e297b3 | 950 | p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops); |
dbee0d3f | 951 | if (!p) { |
99824461 | 952 | pr_err("Unable to initialize /proc/net/atm/arp\n"); |
dbee0d3f WC |
953 | atm_clip_exit_noproc(); |
954 | return -ENOMEM; | |
955 | } | |
24781734 AB |
956 | } |
957 | #endif | |
1da177e4 LT |
958 | |
959 | return 0; | |
960 | } | |
961 | ||
dbee0d3f | 962 | static void atm_clip_exit_noproc(void) |
1da177e4 LT |
963 | { |
964 | struct net_device *dev, *next; | |
965 | ||
f3a0592b SH |
966 | unregister_inetaddr_notifier(&clip_inet_notifier); |
967 | unregister_netdevice_notifier(&clip_dev_notifier); | |
968 | ||
1da177e4 LT |
969 | deregister_atm_ioctl(&clip_ioctl_ops); |
970 | ||
971 | /* First, stop the idle timer, so it stops banging | |
972 | * on the table. | |
973 | */ | |
2d907392 | 974 | del_timer_sync(&idle_timer); |
1da177e4 LT |
975 | |
976 | /* Next, purge the table, so that the device | |
977 | * unregister loop below does not hang due to | |
978 | * device references remaining in the table. | |
979 | */ | |
980 | neigh_ifdown(&clip_tbl, NULL); | |
981 | ||
982 | dev = clip_devs; | |
983 | while (dev) { | |
984 | next = PRIV(dev)->next; | |
985 | unregister_netdev(dev); | |
986 | free_netdev(dev); | |
987 | dev = next; | |
988 | } | |
989 | ||
990 | /* Now it is safe to fully shutdown whole table. */ | |
991 | neigh_table_clear(&clip_tbl); | |
992 | ||
993 | clip_tbl_hook = NULL; | |
994 | } | |
995 | ||
dbee0d3f WC |
996 | static void __exit atm_clip_exit(void) |
997 | { | |
998 | remove_proc_entry("arp", atm_proc_root); | |
999 | ||
1000 | atm_clip_exit_noproc(); | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | module_init(atm_clip_init); |
1004 | module_exit(atm_clip_exit); | |
4909e488 SH |
1005 | MODULE_AUTHOR("Werner Almesberger"); |
1006 | MODULE_DESCRIPTION("Classical/IP over ATM interface"); | |
1da177e4 | 1007 | MODULE_LICENSE("GPL"); |