1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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>
22 #include <linux/capability.h>
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>
28 #include <linux/poison.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/rcupdate.h>
32 #include <linux/jhash.h>
33 #include <linux/slab.h>
34 #include <net/route.h> /* for struct rtable and routing */
35 #include <net/icmp.h> /* icmp_send */
37 #include <linux/param.h> /* for HZ */
38 #include <linux/uaccess.h>
39 #include <asm/byteorder.h> /* for htons etc. */
40 #include <linux/atomic.h>
43 #include "resources.h"
44 #include <net/atmclip.h>
46 static struct net_device *clip_devs;
47 static struct atm_vcc *atmarpd;
48 static struct timer_list idle_timer;
49 static const struct neigh_ops clip_neigh_ops;
51 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, __be32 ip)
54 struct atmarp_ctrl *ctrl;
57 pr_debug("(%d)\n", type);
60 skb = alloc_skb(sizeof(struct atmarp_ctrl), GFP_ATOMIC);
63 ctrl = (struct atmarp_ctrl *)skb_put(skb, sizeof(struct atmarp_ctrl));
67 atm_force_charge(atmarpd, skb->truesize);
70 skb_queue_tail(&sk->sk_receive_queue, skb);
71 sk->sk_data_ready(sk);
75 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
77 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc, entry, entry->neigh);
78 clip_vcc->entry = entry;
79 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
80 clip_vcc->next = entry->vccs;
81 entry->vccs = clip_vcc;
82 entry->neigh->used = jiffies;
85 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
87 struct atmarp_entry *entry = clip_vcc->entry;
88 struct clip_vcc **walk;
91 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
94 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
95 entry->neigh->used = jiffies;
96 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
97 if (*walk == clip_vcc) {
100 *walk = clip_vcc->next; /* atomic */
101 clip_vcc->entry = NULL;
103 netif_wake_queue(entry->neigh->dev);
106 entry->expires = jiffies - 1;
107 /* force resolution or expiration */
108 error = neigh_update(entry->neigh, NULL, NUD_NONE,
109 NEIGH_UPDATE_F_ADMIN);
111 pr_crit("neigh_update failed with %d\n", error);
114 pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry, clip_vcc);
116 netif_tx_unlock_bh(entry->neigh->dev);
119 /* The neighbour entry n->lock is held. */
120 static int neigh_check_cb(struct neighbour *n)
122 struct atmarp_entry *entry = neighbour_priv(n);
125 if (n->ops != &clip_neigh_ops)
127 for (cv = entry->vccs; cv; cv = cv->next) {
128 unsigned long exp = cv->last_use + cv->idle_timeout;
130 if (cv->idle_timeout && time_after(jiffies, exp)) {
131 pr_debug("releasing vcc %p->%p of entry %p\n",
133 vcc_release_async(cv->vcc, -ETIMEDOUT);
137 if (entry->vccs || time_before(jiffies, entry->expires))
140 if (atomic_read(&n->refcnt) > 1) {
143 pr_debug("destruction postponed with ref %d\n",
144 atomic_read(&n->refcnt));
146 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
152 pr_debug("expired neigh %p\n", n);
156 static void idle_timer_check(unsigned long dummy)
158 write_lock(&arp_tbl.lock);
159 __neigh_for_each_release(&arp_tbl, neigh_check_cb);
160 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
161 write_unlock(&arp_tbl.lock);
164 static int clip_arp_rcv(struct sk_buff *skb)
169 vcc = ATM_SKB(skb)->vcc;
170 if (!vcc || !atm_charge(vcc, skb->truesize)) {
171 dev_kfree_skb_any(skb);
174 pr_debug("pushing to %p\n", vcc);
175 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
176 CLIP_VCC(vcc)->old_push(vcc, skb);
180 static const unsigned char llc_oui[] = {
181 0xaa, /* DSAP: non-ISO */
182 0xaa, /* SSAP: non-ISO */
183 0x03, /* Ctrl: Unnumbered Information Command PDU */
184 0x00, /* OUI: EtherType */
189 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
191 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
196 atm_return(vcc, skb->truesize);
202 pr_debug("removing VCC %p\n", clip_vcc);
204 unlink_clip_vcc(clip_vcc);
205 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
209 atm_return(vcc, skb->truesize);
210 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
211 /* clip_vcc->entry == NULL if we don't have an IP address yet */
213 dev_kfree_skb_any(skb);
216 ATM_SKB(skb)->vcc = vcc;
217 skb_reset_mac_header(skb);
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);
223 skb->protocol = ((__be16 *)skb->data)[3];
224 skb_pull(skb, RFC1483LLC_LEN);
225 if (skb->protocol == htons(ETH_P_ARP)) {
226 skb->dev->stats.rx_packets++;
227 skb->dev->stats.rx_bytes += skb->len;
232 clip_vcc->last_use = jiffies;
233 skb->dev->stats.rx_packets++;
234 skb->dev->stats.rx_bytes += skb->len;
235 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
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.
244 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
246 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
247 struct net_device *dev = skb->dev;
251 pr_debug("(vcc %p)\n", vcc);
252 clip_vcc->old_pop(vcc, skb);
253 /* skb->dev == NULL in outbound ARP packets */
256 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
257 if (atm_may_send(vcc, 0)) {
258 old = xchg(&clip_vcc->xoff, 0);
260 netif_wake_queue(dev);
262 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
265 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
267 __be32 *ip = (__be32 *) neigh->primary_key;
269 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
270 to_atmarpd(act_need, PRIV(neigh->dev)->number, *ip);
273 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
275 #ifndef CONFIG_ATM_CLIP_NO_ICMP
276 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
281 static const struct neigh_ops clip_neigh_ops = {
283 .solicit = clip_neigh_solicit,
284 .error_report = clip_neigh_error,
285 .output = neigh_direct_output,
286 .connected_output = neigh_direct_output,
289 static int clip_constructor(struct neighbour *neigh)
291 struct atmarp_entry *entry = neighbour_priv(neigh);
293 if (neigh->tbl->family != AF_INET)
296 if (neigh->type != RTN_UNICAST)
299 neigh->nud_state = NUD_NONE;
300 neigh->ops = &clip_neigh_ops;
301 neigh->output = neigh->ops->output;
302 entry->neigh = neigh;
304 entry->expires = jiffies - 1;
309 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
312 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
313 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
314 * don't increment the usage count. This is used to create entries in
318 static int clip_encap(struct atm_vcc *vcc, int mode)
323 CLIP_VCC(vcc)->encap = mode;
327 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
328 struct net_device *dev)
330 struct clip_priv *clip_priv = PRIV(dev);
331 struct dst_entry *dst = skb_dst(skb);
332 struct atmarp_entry *entry;
340 pr_debug("(skb %p)\n", skb);
342 pr_err("skb_dst(skb) == NULL\n");
344 dev->stats.tx_dropped++;
347 rt = (struct rtable *) dst;
349 daddr = &rt->rt_gateway;
351 daddr = &ip_hdr(skb)->daddr;
352 n = dst_neigh_lookup(dst, daddr);
354 pr_err("NO NEIGHBOUR !\n");
356 dev->stats.tx_dropped++;
359 entry = neighbour_priv(n);
361 if (time_after(jiffies, entry->expires)) {
362 /* should be resolved */
363 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
364 to_atmarpd(act_need, PRIV(dev)->number, *((__be32 *)n->primary_key));
366 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
367 skb_queue_tail(&entry->neigh->arp_queue, skb);
370 dev->stats.tx_dropped++;
372 goto out_release_neigh;
374 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
375 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
376 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
377 if (entry->vccs->encap) {
380 here = skb_push(skb, RFC1483LLC_LEN);
381 memcpy(here, llc_oui, sizeof(llc_oui));
382 ((__be16 *) here)[3] = skb->protocol;
384 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
385 ATM_SKB(skb)->atm_options = vcc->atm_options;
386 entry->vccs->last_use = jiffies;
387 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
388 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
390 pr_warn("XOFF->XOFF transition\n");
391 goto out_release_neigh;
393 dev->stats.tx_packets++;
394 dev->stats.tx_bytes += skb->len;
396 if (atm_may_send(vcc, 0)) {
397 entry->vccs->xoff = 0;
398 goto out_release_neigh;
400 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
401 netif_stop_queue(dev); /* XOFF -> throttle immediately */
403 if (!entry->vccs->xoff)
404 netif_start_queue(dev);
405 /* Oh, we just raced with clip_pop. netif_start_queue should be
406 good enough, because nothing should really be asleep because
407 of the brief netif_stop_queue. If this isn't true or if it
408 changes, use netif_wake_queue instead. */
409 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
415 static int clip_mkip(struct atm_vcc *vcc, int timeout)
417 struct clip_vcc *clip_vcc;
421 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
424 pr_debug("%p vcc %p\n", clip_vcc, vcc);
426 vcc->user_back = clip_vcc;
427 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
428 clip_vcc->entry = NULL;
431 clip_vcc->last_use = jiffies;
432 clip_vcc->idle_timeout = timeout * HZ;
433 clip_vcc->old_push = vcc->push;
434 clip_vcc->old_pop = vcc->pop;
435 vcc->push = clip_push;
438 /* re-process everything received between connection setup and MKIP */
439 vcc_process_recv_queue(vcc);
444 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
446 struct neighbour *neigh;
447 struct atmarp_entry *entry;
449 struct clip_vcc *clip_vcc;
452 if (vcc->push != clip_push) {
453 pr_warn("non-CLIP VCC\n");
456 clip_vcc = CLIP_VCC(vcc);
458 if (!clip_vcc->entry) {
459 pr_err("hiding hidden ATMARP entry\n");
462 pr_debug("remove\n");
463 unlink_clip_vcc(clip_vcc);
466 rt = ip_route_output(&init_net, ip, 0, 1, 0);
469 neigh = __neigh_lookup(&arp_tbl, &ip, rt->dst.dev, 1);
473 entry = neighbour_priv(neigh);
474 if (entry != clip_vcc->entry) {
475 if (!clip_vcc->entry)
478 pr_debug("update\n");
479 unlink_clip_vcc(clip_vcc);
481 link_vcc(clip_vcc, entry);
483 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
484 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
485 neigh_release(neigh);
489 static const struct net_device_ops clip_netdev_ops = {
490 .ndo_start_xmit = clip_start_xmit,
491 .ndo_neigh_construct = clip_constructor,
494 static void clip_setup(struct net_device *dev)
496 dev->netdev_ops = &clip_netdev_ops;
497 dev->type = ARPHRD_ATM;
498 dev->neigh_priv_len = sizeof(struct atmarp_entry);
499 dev->hard_header_len = RFC1483LLC_LEN;
500 dev->mtu = RFC1626_MTU;
501 dev->tx_queue_len = 100; /* "normal" queue (packets) */
502 /* When using a "real" qdisc, the qdisc determines the queue */
503 /* length. tx_queue_len is only used for the default case, */
504 /* without any more elaborate queuing. 100 is a reasonable */
505 /* compromise between decent burst-tolerance and protection */
506 /* against memory hogs. */
510 static int clip_create(int number)
512 struct net_device *dev;
513 struct clip_priv *clip_priv;
517 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
518 if (PRIV(dev)->number == number)
522 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
523 if (PRIV(dev)->number >= number)
524 number = PRIV(dev)->number + 1;
526 dev = alloc_netdev(sizeof(struct clip_priv), "", NET_NAME_UNKNOWN,
530 clip_priv = PRIV(dev);
531 sprintf(dev->name, "atm%d", number);
532 spin_lock_init(&clip_priv->xoff_lock);
533 clip_priv->number = number;
534 error = register_netdev(dev);
539 clip_priv->next = clip_devs;
541 pr_debug("registered (net:%s)\n", dev->name);
545 static int clip_device_event(struct notifier_block *this, unsigned long event,
548 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
550 if (!net_eq(dev_net(dev), &init_net))
553 if (event == NETDEV_UNREGISTER)
556 /* ignore non-CLIP devices */
557 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
562 pr_debug("NETDEV_UP\n");
563 to_atmarpd(act_up, PRIV(dev)->number, 0);
565 case NETDEV_GOING_DOWN:
566 pr_debug("NETDEV_DOWN\n");
567 to_atmarpd(act_down, PRIV(dev)->number, 0);
570 case NETDEV_CHANGEMTU:
571 pr_debug("NETDEV_CHANGE*\n");
572 to_atmarpd(act_change, PRIV(dev)->number, 0);
578 static int clip_inet_event(struct notifier_block *this, unsigned long event,
581 struct in_device *in_dev;
582 struct netdev_notifier_info info;
584 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
586 * Transitions are of the down-change-up type, so it's sufficient to
587 * handle the change on up.
589 if (event != NETDEV_UP)
591 netdev_notifier_info_init(&info, in_dev->dev);
592 return clip_device_event(this, NETDEV_CHANGE, &info);
595 static struct notifier_block clip_dev_notifier = {
596 .notifier_call = clip_device_event,
601 static struct notifier_block clip_inet_notifier = {
602 .notifier_call = clip_inet_event,
607 static void atmarpd_close(struct atm_vcc *vcc)
613 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
616 pr_debug("(done)\n");
617 module_put(THIS_MODULE);
620 static struct atmdev_ops atmarpd_dev_ops = {
621 .close = atmarpd_close
625 static struct atm_dev atmarpd_dev = {
626 .ops = &atmarpd_dev_ops,
629 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
633 static int atm_init_atmarp(struct atm_vcc *vcc)
641 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
644 set_bit(ATM_VF_META, &vcc->flags);
645 set_bit(ATM_VF_READY, &vcc->flags);
646 /* allow replies and avoid getting closed if signaling dies */
647 vcc->dev = &atmarpd_dev;
648 vcc_insert_socket(sk_atm(vcc));
650 vcc->pop = NULL; /* crash */
651 vcc->push_oam = NULL; /* crash */
656 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
658 struct atm_vcc *vcc = ATM_SD(sock);
665 case ATMARP_SETENTRY:
667 if (!capable(CAP_NET_ADMIN))
676 err = clip_create(arg);
679 err = atm_init_atmarp(vcc);
681 sock->state = SS_CONNECTED;
682 __module_get(THIS_MODULE);
686 err = clip_mkip(vcc, arg);
688 case ATMARP_SETENTRY:
689 err = clip_setentry(vcc, (__force __be32)arg);
692 err = clip_encap(vcc, arg);
698 static struct atm_ioctl clip_ioctl_ops = {
699 .owner = THIS_MODULE,
703 #ifdef CONFIG_PROC_FS
705 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
707 static int code[] = { 1, 2, 10, 6, 1, 0 };
708 static int e164[] = { 1, 8, 4, 6, 1, 0 };
710 if (*addr->sas_addr.pub) {
711 seq_printf(seq, "%s", addr->sas_addr.pub);
712 if (*addr->sas_addr.prv)
714 } else if (!*addr->sas_addr.prv) {
715 seq_printf(seq, "%s", "(none)");
718 if (*addr->sas_addr.prv) {
719 unsigned char *prv = addr->sas_addr.prv;
723 fields = *prv == ATM_AFI_E164 ? e164 : code;
724 for (i = 0; fields[i]; i++) {
725 for (j = fields[i]; j; j--)
726 seq_printf(seq, "%02X", *prv++);
733 /* This means the neighbour entry has no attached VCC objects. */
734 #define SEQ_NO_VCC_TOKEN ((void *) 2)
736 static void atmarp_info(struct seq_file *seq, struct neighbour *n,
737 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
739 struct net_device *dev = n->dev;
744 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
745 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
747 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
749 if (clip_vcc == SEQ_NO_VCC_TOKEN)
750 exp = entry->neigh->used;
752 exp = clip_vcc->last_use;
754 exp = (jiffies - exp) / HZ;
756 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
757 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
759 off = scnprintf(buf, sizeof(buf) - 1, "%pI4", n->primary_key);
763 seq_printf(seq, "%s", buf);
765 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
766 if (time_before(jiffies, entry->expires))
767 seq_printf(seq, "(resolving)\n");
769 seq_printf(seq, "(expired, ref %d)\n",
770 atomic_read(&entry->neigh->refcnt));
772 seq_printf(seq, "%d.%d.%d\n",
773 clip_vcc->vcc->dev->number,
774 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
776 svc_addr(seq, &clip_vcc->vcc->remote);
781 struct clip_seq_state {
782 /* This member must be first. */
783 struct neigh_seq_state ns;
785 /* Local to clip specific iteration. */
786 struct clip_vcc *vcc;
789 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
790 struct clip_vcc *curr)
795 return SEQ_NO_VCC_TOKEN;
798 if (curr == SEQ_NO_VCC_TOKEN)
806 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
807 struct atmarp_entry *e, loff_t * pos)
809 struct clip_vcc *vcc = state->vcc;
811 vcc = clip_seq_next_vcc(e, vcc);
812 if (vcc && pos != NULL) {
814 vcc = clip_seq_next_vcc(e, vcc);
825 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
826 struct neighbour *n, loff_t * pos)
828 struct clip_seq_state *state = (struct clip_seq_state *)_state;
830 if (n->dev->type != ARPHRD_ATM)
833 return clip_seq_vcc_walk(state, neighbour_priv(n), pos);
836 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
838 struct clip_seq_state *state = seq->private;
839 state->ns.neigh_sub_iter = clip_seq_sub_iter;
840 return neigh_seq_start(seq, pos, &arp_tbl, NEIGH_SEQ_NEIGH_ONLY);
843 static int clip_seq_show(struct seq_file *seq, void *v)
845 static char atm_arp_banner[] =
846 "IPitf TypeEncp Idle IP address ATM address\n";
848 if (v == SEQ_START_TOKEN) {
849 seq_puts(seq, atm_arp_banner);
851 struct clip_seq_state *state = seq->private;
852 struct clip_vcc *vcc = state->vcc;
853 struct neighbour *n = v;
855 atmarp_info(seq, n, neighbour_priv(n), vcc);
860 static const struct seq_operations arp_seq_ops = {
861 .start = clip_seq_start,
862 .next = neigh_seq_next,
863 .stop = neigh_seq_stop,
864 .show = clip_seq_show,
867 static int arp_seq_open(struct inode *inode, struct file *file)
869 return seq_open_net(inode, file, &arp_seq_ops,
870 sizeof(struct clip_seq_state));
873 static const struct file_operations arp_seq_fops = {
874 .open = arp_seq_open,
877 .release = seq_release_net,
882 static void atm_clip_exit_noproc(void);
884 static int __init atm_clip_init(void)
886 register_atm_ioctl(&clip_ioctl_ops);
887 register_netdevice_notifier(&clip_dev_notifier);
888 register_inetaddr_notifier(&clip_inet_notifier);
890 setup_timer(&idle_timer, idle_timer_check, 0);
892 #ifdef CONFIG_PROC_FS
894 struct proc_dir_entry *p;
896 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
898 pr_err("Unable to initialize /proc/net/atm/arp\n");
899 atm_clip_exit_noproc();
908 static void atm_clip_exit_noproc(void)
910 struct net_device *dev, *next;
912 unregister_inetaddr_notifier(&clip_inet_notifier);
913 unregister_netdevice_notifier(&clip_dev_notifier);
915 deregister_atm_ioctl(&clip_ioctl_ops);
917 /* First, stop the idle timer, so it stops banging
920 del_timer_sync(&idle_timer);
924 next = PRIV(dev)->next;
925 unregister_netdev(dev);
931 static void __exit atm_clip_exit(void)
933 remove_proc_entry("arp", atm_proc_root);
935 atm_clip_exit_noproc();
938 module_init(atm_clip_init);
939 module_exit(atm_clip_exit);
940 MODULE_AUTHOR("Werner Almesberger");
941 MODULE_DESCRIPTION("Classical/IP over ATM interface");
942 MODULE_LICENSE("GPL");