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 */
36 #include <linux/param.h> /* for HZ */
37 #include <linux/uaccess.h>
38 #include <asm/byteorder.h> /* for htons etc. */
39 #include <asm/system.h> /* save/restore_flags */
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 neigh_table clip_tbl;
49 static struct timer_list idle_timer;
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, skb->len);
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 = NEIGH2ENTRY(n);
125 for (cv = entry->vccs; cv; cv = cv->next) {
126 unsigned long exp = cv->last_use + cv->idle_timeout;
128 if (cv->idle_timeout && time_after(jiffies, exp)) {
129 pr_debug("releasing vcc %p->%p of entry %p\n",
131 vcc_release_async(cv->vcc, -ETIMEDOUT);
135 if (entry->vccs || time_before(jiffies, entry->expires))
138 if (atomic_read(&n->refcnt) > 1) {
141 pr_debug("destruction postponed with ref %d\n",
142 atomic_read(&n->refcnt));
144 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
150 pr_debug("expired neigh %p\n", n);
154 static void idle_timer_check(unsigned long dummy)
156 write_lock(&clip_tbl.lock);
157 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
158 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
159 write_unlock(&clip_tbl.lock);
162 static int clip_arp_rcv(struct sk_buff *skb)
167 vcc = ATM_SKB(skb)->vcc;
168 if (!vcc || !atm_charge(vcc, skb->truesize)) {
169 dev_kfree_skb_any(skb);
172 pr_debug("pushing to %p\n", vcc);
173 pr_debug("using %p\n", CLIP_VCC(vcc)->old_push);
174 CLIP_VCC(vcc)->old_push(vcc, skb);
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 */
187 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
189 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
193 pr_debug("removing VCC %p\n", clip_vcc);
195 unlink_clip_vcc(clip_vcc);
196 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
200 atm_return(vcc, skb->truesize);
201 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
202 /* clip_vcc->entry == NULL if we don't have an IP address yet */
204 dev_kfree_skb_any(skb);
207 ATM_SKB(skb)->vcc = vcc;
208 skb_reset_mac_header(skb);
209 if (!clip_vcc->encap ||
210 skb->len < RFC1483LLC_LEN ||
211 memcmp(skb->data, llc_oui, sizeof(llc_oui)))
212 skb->protocol = htons(ETH_P_IP);
214 skb->protocol = ((__be16 *)skb->data)[3];
215 skb_pull(skb, RFC1483LLC_LEN);
216 if (skb->protocol == htons(ETH_P_ARP)) {
217 skb->dev->stats.rx_packets++;
218 skb->dev->stats.rx_bytes += skb->len;
223 clip_vcc->last_use = jiffies;
224 skb->dev->stats.rx_packets++;
225 skb->dev->stats.rx_bytes += skb->len;
226 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
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.
235 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
237 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
238 struct net_device *dev = skb->dev;
242 pr_debug("(vcc %p)\n", vcc);
243 clip_vcc->old_pop(vcc, skb);
244 /* skb->dev == NULL in outbound ARP packets */
247 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
248 if (atm_may_send(vcc, 0)) {
249 old = xchg(&clip_vcc->xoff, 0);
251 netif_wake_queue(dev);
253 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
256 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
258 pr_debug("(neigh %p, skb %p)\n", neigh, skb);
259 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
262 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
264 #ifndef CONFIG_ATM_CLIP_NO_ICMP
265 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
270 static const struct neigh_ops clip_neigh_ops = {
272 .solicit = clip_neigh_solicit,
273 .error_report = clip_neigh_error,
274 .output = neigh_direct_output,
275 .connected_output = neigh_direct_output,
278 static int clip_constructor(struct neighbour *neigh)
280 struct atmarp_entry *entry = NEIGH2ENTRY(neigh);
281 struct net_device *dev = neigh->dev;
282 struct in_device *in_dev;
283 struct neigh_parms *parms;
285 pr_debug("(neigh %p, entry %p)\n", neigh, entry);
286 neigh->type = inet_addr_type(&init_net, entry->ip);
287 if (neigh->type != RTN_UNICAST)
291 in_dev = __in_dev_get_rcu(dev);
297 parms = in_dev->arp_parms;
298 __neigh_parms_put(neigh->parms);
299 neigh->parms = neigh_parms_clone(parms);
302 neigh->ops = &clip_neigh_ops;
303 neigh->output = neigh->nud_state & NUD_VALID ?
304 neigh->ops->connected_output : neigh->ops->output;
305 entry->neigh = neigh;
307 entry->expires = jiffies - 1;
311 static u32 clip_hash(const void *pkey, const struct net_device *dev, __u32 rnd)
313 return jhash_2words(*(u32 *) pkey, dev->ifindex, rnd);
316 static struct neigh_table clip_tbl = {
318 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
321 .constructor = clip_constructor,
322 .id = "clip_arp_cache",
324 /* parameters are copied from ARP ... */
327 .base_reachable_time = 30 * HZ,
328 .retrans_time = 1 * HZ,
329 .gc_staletime = 60 * HZ,
330 .reachable_time = 30 * HZ,
331 .delay_probe_time = 5 * HZ,
332 .queue_len_bytes = 64 * 1024,
335 .anycast_delay = 1 * HZ,
336 .proxy_delay = (8 * HZ) / 10,
340 .gc_interval = 30 * HZ,
346 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
349 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
350 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
351 * don't increment the usage count. This is used to create entries in
355 static int clip_encap(struct atm_vcc *vcc, int mode)
357 CLIP_VCC(vcc)->encap = mode;
361 static netdev_tx_t clip_start_xmit(struct sk_buff *skb,
362 struct net_device *dev)
364 struct clip_priv *clip_priv = PRIV(dev);
365 struct dst_entry *dst = skb_dst(skb);
366 struct atmarp_entry *entry;
372 pr_debug("(skb %p)\n", skb);
374 pr_err("skb_dst(skb) == NULL\n");
376 dev->stats.tx_dropped++;
379 n = dst_get_neighbour(dst);
382 n = clip_find_neighbour(skb_dst(skb), 1);
384 dev_kfree_skb(skb); /* lost that one */
385 dev->stats.tx_dropped++;
388 dst_set_neighbour(dst, n);
390 pr_err("NO NEIGHBOUR !\n");
392 dev->stats.tx_dropped++;
395 entry = NEIGH2ENTRY(n);
397 if (time_after(jiffies, entry->expires)) {
398 /* should be resolved */
399 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
400 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
402 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
403 skb_queue_tail(&entry->neigh->arp_queue, skb);
406 dev->stats.tx_dropped++;
410 pr_debug("neigh %p, vccs %p\n", entry, entry->vccs);
411 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
412 pr_debug("using neighbour %p, vcc %p\n", n, vcc);
413 if (entry->vccs->encap) {
416 here = skb_push(skb, RFC1483LLC_LEN);
417 memcpy(here, llc_oui, sizeof(llc_oui));
418 ((__be16 *) here)[3] = skb->protocol;
420 atomic_add(skb->truesize, &sk_atm(vcc)->sk_wmem_alloc);
421 ATM_SKB(skb)->atm_options = vcc->atm_options;
422 entry->vccs->last_use = jiffies;
423 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
424 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
426 pr_warning("XOFF->XOFF transition\n");
429 dev->stats.tx_packets++;
430 dev->stats.tx_bytes += skb->len;
432 if (atm_may_send(vcc, 0)) {
433 entry->vccs->xoff = 0;
436 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
437 netif_stop_queue(dev); /* XOFF -> throttle immediately */
439 if (!entry->vccs->xoff)
440 netif_start_queue(dev);
441 /* Oh, we just raced with clip_pop. netif_start_queue should be
442 good enough, because nothing should really be asleep because
443 of the brief netif_stop_queue. If this isn't true or if it
444 changes, use netif_wake_queue instead. */
445 spin_unlock_irqrestore(&clip_priv->xoff_lock, flags);
449 static int clip_mkip(struct atm_vcc *vcc, int timeout)
451 struct sk_buff_head *rq, queue;
452 struct clip_vcc *clip_vcc;
453 struct sk_buff *skb, *tmp;
458 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
461 pr_debug("%p vcc %p\n", clip_vcc, vcc);
463 vcc->user_back = clip_vcc;
464 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
465 clip_vcc->entry = NULL;
468 clip_vcc->last_use = jiffies;
469 clip_vcc->idle_timeout = timeout * HZ;
470 clip_vcc->old_push = vcc->push;
471 clip_vcc->old_pop = vcc->pop;
472 vcc->push = clip_push;
475 __skb_queue_head_init(&queue);
476 rq = &sk_atm(vcc)->sk_receive_queue;
478 spin_lock_irqsave(&rq->lock, flags);
479 skb_queue_splice_init(rq, &queue);
480 spin_unlock_irqrestore(&rq->lock, flags);
482 /* re-process everything received between connection setup and MKIP */
483 skb_queue_walk_safe(&queue, skb, tmp) {
485 atm_return(vcc, skb->truesize);
488 struct net_device *dev = skb->dev;
489 unsigned int len = skb->len;
493 dev->stats.rx_packets--;
494 dev->stats.rx_bytes -= len;
501 static int clip_setentry(struct atm_vcc *vcc, __be32 ip)
503 struct neighbour *neigh;
504 struct atmarp_entry *entry;
506 struct clip_vcc *clip_vcc;
509 if (vcc->push != clip_push) {
510 pr_warning("non-CLIP VCC\n");
513 clip_vcc = CLIP_VCC(vcc);
515 if (!clip_vcc->entry) {
516 pr_err("hiding hidden ATMARP entry\n");
519 pr_debug("remove\n");
520 unlink_clip_vcc(clip_vcc);
523 rt = ip_route_output(&init_net, ip, 0, 1, 0);
526 neigh = __neigh_lookup(&clip_tbl, &ip, rt->dst.dev, 1);
530 entry = NEIGH2ENTRY(neigh);
531 if (entry != clip_vcc->entry) {
532 if (!clip_vcc->entry)
535 pr_debug("update\n");
536 unlink_clip_vcc(clip_vcc);
538 link_vcc(clip_vcc, entry);
540 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
541 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
542 neigh_release(neigh);
546 static const struct net_device_ops clip_netdev_ops = {
547 .ndo_start_xmit = clip_start_xmit,
550 static void clip_setup(struct net_device *dev)
552 dev->netdev_ops = &clip_netdev_ops;
553 dev->type = ARPHRD_ATM;
554 dev->hard_header_len = RFC1483LLC_LEN;
555 dev->mtu = RFC1626_MTU;
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. */
562 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
565 static int clip_create(int number)
567 struct net_device *dev;
568 struct clip_priv *clip_priv;
572 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
573 if (PRIV(dev)->number == number)
577 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
578 if (PRIV(dev)->number >= number)
579 number = PRIV(dev)->number + 1;
581 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
584 clip_priv = PRIV(dev);
585 sprintf(dev->name, "atm%d", number);
586 spin_lock_init(&clip_priv->xoff_lock);
587 clip_priv->number = number;
588 error = register_netdev(dev);
593 clip_priv->next = clip_devs;
595 pr_debug("registered (net:%s)\n", dev->name);
599 static int clip_device_event(struct notifier_block *this, unsigned long event,
602 struct net_device *dev = arg;
604 if (!net_eq(dev_net(dev), &init_net))
607 if (event == NETDEV_UNREGISTER) {
608 neigh_ifdown(&clip_tbl, dev);
612 /* ignore non-CLIP devices */
613 if (dev->type != ARPHRD_ATM || dev->netdev_ops != &clip_netdev_ops)
618 pr_debug("NETDEV_UP\n");
619 to_atmarpd(act_up, PRIV(dev)->number, 0);
621 case NETDEV_GOING_DOWN:
622 pr_debug("NETDEV_DOWN\n");
623 to_atmarpd(act_down, PRIV(dev)->number, 0);
626 case NETDEV_CHANGEMTU:
627 pr_debug("NETDEV_CHANGE*\n");
628 to_atmarpd(act_change, PRIV(dev)->number, 0);
634 static int clip_inet_event(struct notifier_block *this, unsigned long event,
637 struct in_device *in_dev;
639 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
641 * Transitions are of the down-change-up type, so it's sufficient to
642 * handle the change on up.
644 if (event != NETDEV_UP)
646 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
649 static struct notifier_block clip_dev_notifier = {
650 .notifier_call = clip_device_event,
655 static struct notifier_block clip_inet_notifier = {
656 .notifier_call = clip_inet_event,
661 static void atmarpd_close(struct atm_vcc *vcc)
667 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
670 pr_debug("(done)\n");
671 module_put(THIS_MODULE);
674 static struct atmdev_ops atmarpd_dev_ops = {
675 .close = atmarpd_close
679 static struct atm_dev atmarpd_dev = {
680 .ops = &atmarpd_dev_ops,
683 .lock = __SPIN_LOCK_UNLOCKED(atmarpd_dev.lock)
687 static int atm_init_atmarp(struct atm_vcc *vcc)
695 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
698 set_bit(ATM_VF_META, &vcc->flags);
699 set_bit(ATM_VF_READY, &vcc->flags);
700 /* allow replies and avoid getting closed if signaling dies */
701 vcc->dev = &atmarpd_dev;
702 vcc_insert_socket(sk_atm(vcc));
704 vcc->pop = NULL; /* crash */
705 vcc->push_oam = NULL; /* crash */
710 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
712 struct atm_vcc *vcc = ATM_SD(sock);
719 case ATMARP_SETENTRY:
721 if (!capable(CAP_NET_ADMIN))
730 err = clip_create(arg);
733 err = atm_init_atmarp(vcc);
735 sock->state = SS_CONNECTED;
736 __module_get(THIS_MODULE);
740 err = clip_mkip(vcc, arg);
742 case ATMARP_SETENTRY:
743 err = clip_setentry(vcc, (__force __be32)arg);
746 err = clip_encap(vcc, arg);
752 static struct atm_ioctl clip_ioctl_ops = {
753 .owner = THIS_MODULE,
757 #ifdef CONFIG_PROC_FS
759 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
761 static int code[] = { 1, 2, 10, 6, 1, 0 };
762 static int e164[] = { 1, 8, 4, 6, 1, 0 };
764 if (*addr->sas_addr.pub) {
765 seq_printf(seq, "%s", addr->sas_addr.pub);
766 if (*addr->sas_addr.prv)
768 } else if (!*addr->sas_addr.prv) {
769 seq_printf(seq, "%s", "(none)");
772 if (*addr->sas_addr.prv) {
773 unsigned char *prv = addr->sas_addr.prv;
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++);
787 /* This means the neighbour entry has no attached VCC objects. */
788 #define SEQ_NO_VCC_TOKEN ((void *) 2)
790 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
791 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
797 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
798 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
800 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
802 if (clip_vcc == SEQ_NO_VCC_TOKEN)
803 exp = entry->neigh->used;
805 exp = clip_vcc->last_use;
807 exp = (jiffies - exp) / HZ;
809 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
810 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
812 off = scnprintf(buf, sizeof(buf) - 1, "%pI4",
817 seq_printf(seq, "%s", buf);
819 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
820 if (time_before(jiffies, entry->expires))
821 seq_printf(seq, "(resolving)\n");
823 seq_printf(seq, "(expired, ref %d)\n",
824 atomic_read(&entry->neigh->refcnt));
826 seq_printf(seq, "%d.%d.%d\n",
827 clip_vcc->vcc->dev->number,
828 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
830 svc_addr(seq, &clip_vcc->vcc->remote);
835 struct clip_seq_state {
836 /* This member must be first. */
837 struct neigh_seq_state ns;
839 /* Local to clip specific iteration. */
840 struct clip_vcc *vcc;
843 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
844 struct clip_vcc *curr)
849 return SEQ_NO_VCC_TOKEN;
852 if (curr == SEQ_NO_VCC_TOKEN)
860 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
861 struct atmarp_entry *e, loff_t * pos)
863 struct clip_vcc *vcc = state->vcc;
865 vcc = clip_seq_next_vcc(e, vcc);
866 if (vcc && pos != NULL) {
868 vcc = clip_seq_next_vcc(e, vcc);
879 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
880 struct neighbour *n, loff_t * pos)
882 struct clip_seq_state *state = (struct clip_seq_state *)_state;
884 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
887 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
889 struct clip_seq_state *state = seq->private;
890 state->ns.neigh_sub_iter = clip_seq_sub_iter;
891 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
894 static int clip_seq_show(struct seq_file *seq, void *v)
896 static char atm_arp_banner[] =
897 "IPitf TypeEncp Idle IP address ATM address\n";
899 if (v == SEQ_START_TOKEN) {
900 seq_puts(seq, atm_arp_banner);
902 struct clip_seq_state *state = seq->private;
903 struct neighbour *n = v;
904 struct clip_vcc *vcc = state->vcc;
906 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
911 static const struct seq_operations arp_seq_ops = {
912 .start = clip_seq_start,
913 .next = neigh_seq_next,
914 .stop = neigh_seq_stop,
915 .show = clip_seq_show,
918 static int arp_seq_open(struct inode *inode, struct file *file)
920 return seq_open_net(inode, file, &arp_seq_ops,
921 sizeof(struct clip_seq_state));
924 static const struct file_operations arp_seq_fops = {
925 .open = arp_seq_open,
928 .release = seq_release_net,
933 static void atm_clip_exit_noproc(void);
935 static int __init atm_clip_init(void)
937 neigh_table_init_no_netlink(&clip_tbl);
939 clip_tbl_hook = &clip_tbl;
940 register_atm_ioctl(&clip_ioctl_ops);
941 register_netdevice_notifier(&clip_dev_notifier);
942 register_inetaddr_notifier(&clip_inet_notifier);
944 setup_timer(&idle_timer, idle_timer_check, 0);
946 #ifdef CONFIG_PROC_FS
948 struct proc_dir_entry *p;
950 p = proc_create("arp", S_IRUGO, atm_proc_root, &arp_seq_fops);
952 pr_err("Unable to initialize /proc/net/atm/arp\n");
953 atm_clip_exit_noproc();
962 static void atm_clip_exit_noproc(void)
964 struct net_device *dev, *next;
966 unregister_inetaddr_notifier(&clip_inet_notifier);
967 unregister_netdevice_notifier(&clip_dev_notifier);
969 deregister_atm_ioctl(&clip_ioctl_ops);
971 /* First, stop the idle timer, so it stops banging
974 del_timer_sync(&idle_timer);
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.
980 neigh_ifdown(&clip_tbl, NULL);
984 next = PRIV(dev)->next;
985 unregister_netdev(dev);
990 /* Now it is safe to fully shutdown whole table. */
991 neigh_table_clear(&clip_tbl);
993 clip_tbl_hook = NULL;
996 static void __exit atm_clip_exit(void)
998 remove_proc_entry("arp", atm_proc_root);
1000 atm_clip_exit_noproc();
1003 module_init(atm_clip_init);
1004 module_exit(atm_clip_exit);
1005 MODULE_AUTHOR("Werner Almesberger");
1006 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1007 MODULE_LICENSE("GPL");