1 /* net/atm/clip.c - RFC1577 Classical IP over ATM */
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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>
20 #include <linux/capability.h>
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>
26 #include <linux/proc_fs.h>
27 #include <linux/seq_file.h>
28 #include <linux/rcupdate.h>
29 #include <linux/jhash.h>
30 #include <net/route.h> /* for struct rtable and routing */
31 #include <net/icmp.h> /* icmp_send */
32 #include <asm/param.h> /* for HZ */
33 #include <asm/byteorder.h> /* for htons etc. */
34 #include <asm/system.h> /* save/restore_flags */
35 #include <asm/uaccess.h>
36 #include <asm/atomic.h>
39 #include "resources.h"
41 #include <net/atmclip.h>
45 #define DPRINTK(format,args...) printk(format,##args)
47 #define DPRINTK(format,args...)
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;
56 static int to_atmarpd(enum atmarp_ctrl_type type, int itf, unsigned long ip)
59 struct atmarp_ctrl *ctrl;
62 DPRINTK("to_atmarpd(%d)\n", type);
65 skb = alloc_skb(sizeof(struct atmarp_ctrl),GFP_ATOMIC);
68 ctrl = (struct atmarp_ctrl *) skb_put(skb,sizeof(struct atmarp_ctrl));
72 atm_force_charge(atmarpd, skb->truesize);
75 skb_queue_tail(&sk->sk_receive_queue, skb);
76 sk->sk_data_ready(sk, skb->len);
80 static void link_vcc(struct clip_vcc *clip_vcc, struct atmarp_entry *entry)
82 DPRINTK("link_vcc %p to entry %p (neigh %p)\n", clip_vcc, entry,
84 clip_vcc->entry = entry;
85 clip_vcc->xoff = 0; /* @@@ may overrun buffer by one packet */
86 clip_vcc->next = entry->vccs;
87 entry->vccs = clip_vcc;
88 entry->neigh->used = jiffies;
91 static void unlink_clip_vcc(struct clip_vcc *clip_vcc)
93 struct atmarp_entry *entry = clip_vcc->entry;
94 struct clip_vcc **walk;
97 printk(KERN_CRIT "!clip_vcc->entry (clip_vcc %p)\n", clip_vcc);
100 netif_tx_lock_bh(entry->neigh->dev); /* block clip_start_xmit() */
101 entry->neigh->used = jiffies;
102 for (walk = &entry->vccs; *walk; walk = &(*walk)->next)
103 if (*walk == clip_vcc) {
106 *walk = clip_vcc->next; /* atomic */
107 clip_vcc->entry = NULL;
109 netif_wake_queue(entry->neigh->dev);
112 entry->expires = jiffies - 1;
113 /* force resolution or expiration */
114 error = neigh_update(entry->neigh, NULL, NUD_NONE,
115 NEIGH_UPDATE_F_ADMIN);
117 printk(KERN_CRIT "unlink_clip_vcc: "
118 "neigh_update failed with %d\n", error);
121 printk(KERN_CRIT "ATMARP: unlink_clip_vcc failed (entry %p, vcc "
122 "0x%p)\n", entry, clip_vcc);
124 netif_tx_unlock_bh(entry->neigh->dev);
127 /* The neighbour entry n->lock is held. */
128 static int neigh_check_cb(struct neighbour *n)
130 struct atmarp_entry *entry = NEIGH2ENTRY(n);
133 for (cv = entry->vccs; cv; cv = cv->next) {
134 unsigned long exp = cv->last_use + cv->idle_timeout;
136 if (cv->idle_timeout && time_after(jiffies, exp)) {
137 DPRINTK("releasing vcc %p->%p of entry %p\n",
139 vcc_release_async(cv->vcc, -ETIMEDOUT);
143 if (entry->vccs || time_before(jiffies, entry->expires))
146 if (atomic_read(&n->refcnt) > 1) {
149 DPRINTK("destruction postponed with ref %d\n",
150 atomic_read(&n->refcnt));
152 while ((skb = skb_dequeue(&n->arp_queue)) != NULL)
158 DPRINTK("expired neigh %p\n", n);
162 static void idle_timer_check(unsigned long dummy)
164 write_lock(&clip_tbl.lock);
165 __neigh_for_each_release(&clip_tbl, neigh_check_cb);
166 mod_timer(&idle_timer, jiffies + CLIP_CHECK_INTERVAL * HZ);
167 write_unlock(&clip_tbl.lock);
170 static int clip_arp_rcv(struct sk_buff *skb)
174 DPRINTK("clip_arp_rcv\n");
175 vcc = ATM_SKB(skb)->vcc;
176 if (!vcc || !atm_charge(vcc, skb->truesize)) {
177 dev_kfree_skb_any(skb);
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);
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 */
195 static void clip_push(struct atm_vcc *vcc, struct sk_buff *skb)
197 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
199 DPRINTK("clip push\n");
201 DPRINTK("removing VCC %p\n", clip_vcc);
203 unlink_clip_vcc(clip_vcc);
204 clip_vcc->old_push(vcc, NULL); /* pass on the bad news */
208 atm_return(vcc, skb->truesize);
209 skb->dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : clip_devs;
210 /* clip_vcc->entry == NULL if we don't have an IP address yet */
212 dev_kfree_skb_any(skb);
215 ATM_SKB(skb)->vcc = vcc;
216 skb->mac.raw = skb->data;
218 || skb->len < RFC1483LLC_LEN
219 || memcmp(skb->data, llc_oui, sizeof (llc_oui)))
220 skb->protocol = htons(ETH_P_IP);
222 skb->protocol = ((u16 *) skb->data)[3];
223 skb_pull(skb, RFC1483LLC_LEN);
224 if (skb->protocol == htons(ETH_P_ARP)) {
225 PRIV(skb->dev)->stats.rx_packets++;
226 PRIV(skb->dev)->stats.rx_bytes += skb->len;
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));
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.
243 static void clip_pop(struct atm_vcc *vcc, struct sk_buff *skb)
245 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
246 struct net_device *dev = skb->dev;
250 DPRINTK("clip_pop(vcc %p)\n", vcc);
251 clip_vcc->old_pop(vcc, skb);
252 /* skb->dev == NULL in outbound ARP packets */
255 spin_lock_irqsave(&PRIV(dev)->xoff_lock, flags);
256 if (atm_may_send(vcc, 0)) {
257 old = xchg(&clip_vcc->xoff, 0);
259 netif_wake_queue(dev);
261 spin_unlock_irqrestore(&PRIV(dev)->xoff_lock, flags);
264 static void clip_neigh_destroy(struct neighbour *neigh)
266 DPRINTK("clip_neigh_destroy (neigh %p)\n", neigh);
267 if (NEIGH2ENTRY(neigh)->vccs)
268 printk(KERN_CRIT "clip_neigh_destroy: vccs != NULL !!!\n");
269 NEIGH2ENTRY(neigh)->vccs = (void *) 0xdeadbeef;
272 static void clip_neigh_solicit(struct neighbour *neigh, struct sk_buff *skb)
274 DPRINTK("clip_neigh_solicit (neigh %p, skb %p)\n", neigh, skb);
275 to_atmarpd(act_need, PRIV(neigh->dev)->number, NEIGH2ENTRY(neigh)->ip);
278 static void clip_neigh_error(struct neighbour *neigh, struct sk_buff *skb)
280 #ifndef CONFIG_ATM_CLIP_NO_ICMP
281 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
286 static struct neigh_ops clip_neigh_ops = {
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,
296 static int clip_constructor(struct neighbour *neigh)
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;
303 DPRINTK("clip_constructor (neigh %p, entry %p)\n", neigh, entry);
304 neigh->type = inet_addr_type(entry->ip);
305 if (neigh->type != RTN_UNICAST)
309 in_dev = __in_dev_get_rcu(dev);
315 parms = in_dev->arp_parms;
316 __neigh_parms_put(neigh->parms);
317 neigh->parms = neigh_parms_clone(parms);
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;
325 entry->expires = jiffies - 1;
329 static u32 clip_hash(const void *pkey, const struct net_device *dev)
331 return jhash_2words(*(u32 *) pkey, dev->ifindex, clip_tbl.hash_rnd);
334 static struct neigh_table clip_tbl = {
336 .entry_size = sizeof(struct neighbour)+sizeof(struct atmarp_entry),
339 .constructor = clip_constructor,
340 .id = "clip_arp_cache",
342 /* parameters are copied from ARP ... */
345 .neigh_destructor = clip_neigh_destroy,
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,
354 .anycast_delay = 1 * HZ,
355 .proxy_delay = (8 * HZ) / 10,
359 .gc_interval = 30 * HZ,
365 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
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
374 static int clip_encap(struct atm_vcc *vcc, int mode)
376 CLIP_VCC(vcc)->encap = mode;
380 static int clip_start_xmit(struct sk_buff *skb, struct net_device *dev)
382 struct clip_priv *clip_priv = PRIV(dev);
383 struct atmarp_entry *entry;
388 DPRINTK("clip_start_xmit (skb %p)\n", skb);
390 printk(KERN_ERR "clip_start_xmit: skb->dst == NULL\n");
392 clip_priv->stats.tx_dropped++;
395 if (!skb->dst->neighbour) {
397 skb->dst->neighbour = clip_find_neighbour(skb->dst, 1);
398 if (!skb->dst->neighbour) {
399 dev_kfree_skb(skb); /* lost that one */
400 clip_priv->stats.tx_dropped++;
404 printk(KERN_ERR "clip_start_xmit: NO NEIGHBOUR !\n");
406 clip_priv->stats.tx_dropped++;
409 entry = NEIGH2ENTRY(skb->dst->neighbour);
411 if (time_after(jiffies, entry->expires)) {
412 /* should be resolved */
413 entry->expires = jiffies + ATMARP_RETRY_DELAY * HZ;
414 to_atmarpd(act_need, PRIV(dev)->number, entry->ip);
416 if (entry->neigh->arp_queue.qlen < ATMARP_MAX_UNRES_PACKETS)
417 skb_queue_tail(&entry->neigh->arp_queue, skb);
420 clip_priv->stats.tx_dropped++;
424 DPRINTK("neigh %p, vccs %p\n", entry, entry->vccs);
425 ATM_SKB(skb)->vcc = vcc = entry->vccs->vcc;
426 DPRINTK("using neighbour %p, vcc %p\n", skb->dst->neighbour, vcc);
427 if (entry->vccs->encap) {
430 here = skb_push(skb, RFC1483LLC_LEN);
431 memcpy(here, llc_oui, sizeof(llc_oui));
432 ((u16 *) here)[3] = skb->protocol;
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;
437 DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, vcc, vcc->dev);
438 old = xchg(&entry->vccs->xoff, 1); /* assume XOFF ... */
440 printk(KERN_WARNING "clip_start_xmit: XOFF->XOFF transition\n");
443 clip_priv->stats.tx_packets++;
444 clip_priv->stats.tx_bytes += skb->len;
446 if (atm_may_send(vcc, 0)) {
447 entry->vccs->xoff = 0;
450 spin_lock_irqsave(&clip_priv->xoff_lock, flags);
451 netif_stop_queue(dev); /* XOFF -> throttle immediately */
453 if (!entry->vccs->xoff)
454 netif_start_queue(dev);
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);
463 static struct net_device_stats *clip_get_stats(struct net_device *dev)
465 return &PRIV(dev)->stats;
468 static int clip_mkip(struct atm_vcc *vcc, int timeout)
470 struct clip_vcc *clip_vcc;
471 struct sk_buff_head copy;
476 clip_vcc = kmalloc(sizeof(struct clip_vcc), GFP_KERNEL);
479 DPRINTK("mkip clip_vcc %p vcc %p\n", clip_vcc, vcc);
481 vcc->user_back = clip_vcc;
482 set_bit(ATM_VF_IS_CLIP, &vcc->flags);
483 clip_vcc->entry = NULL;
486 clip_vcc->last_use = jiffies;
487 clip_vcc->idle_timeout = timeout * HZ;
488 clip_vcc->old_push = vcc->push;
489 clip_vcc->old_pop = vcc->pop;
490 vcc->push = clip_push;
492 skb_queue_head_init(©);
493 skb_migrate(&sk_atm(vcc)->sk_receive_queue, ©);
494 /* re-process everything received between connection setup and MKIP */
495 while ((skb = skb_dequeue(©)) != NULL)
497 atm_return(vcc, skb->truesize);
500 unsigned int len = skb->len;
503 PRIV(skb->dev)->stats.rx_packets--;
504 PRIV(skb->dev)->stats.rx_bytes -= len;
509 static int clip_setentry(struct atm_vcc *vcc, u32 ip)
511 struct neighbour *neigh;
512 struct atmarp_entry *entry;
514 struct clip_vcc *clip_vcc;
515 struct flowi fl = { .nl_u = { .ip4_u = { .daddr = ip, .tos = 1}} };
518 if (vcc->push != clip_push) {
519 printk(KERN_WARNING "clip_setentry: non-CLIP VCC\n");
522 clip_vcc = CLIP_VCC(vcc);
524 if (!clip_vcc->entry) {
525 printk(KERN_ERR "hiding hidden ATMARP entry\n");
528 DPRINTK("setentry: remove\n");
529 unlink_clip_vcc(clip_vcc);
532 error = ip_route_output_key(&rt, &fl);
535 neigh = __neigh_lookup(&clip_tbl, &ip, rt->u.dst.dev, 1);
539 entry = NEIGH2ENTRY(neigh);
540 if (entry != clip_vcc->entry) {
541 if (!clip_vcc->entry)
542 DPRINTK("setentry: add\n");
544 DPRINTK("setentry: update\n");
545 unlink_clip_vcc(clip_vcc);
547 link_vcc(clip_vcc, entry);
549 error = neigh_update(neigh, llc_oui, NUD_PERMANENT,
550 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN);
551 neigh_release(neigh);
555 static void clip_setup(struct net_device *dev)
557 dev->hard_start_xmit = clip_start_xmit;
559 dev->get_stats = clip_get_stats;
560 dev->type = ARPHRD_ATM;
561 dev->hard_header_len = RFC1483LLC_LEN;
562 dev->mtu = RFC1626_MTU;
563 dev->tx_queue_len = 100; /* "normal" queue (packets) */
564 /* When using a "real" qdisc, the qdisc determines the queue */
565 /* length. tx_queue_len is only used for the default case, */
566 /* without any more elaborate queuing. 100 is a reasonable */
567 /* compromise between decent burst-tolerance and protection */
568 /* against memory hogs. */
571 static int clip_create(int number)
573 struct net_device *dev;
574 struct clip_priv *clip_priv;
578 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
579 if (PRIV(dev)->number == number)
583 for (dev = clip_devs; dev; dev = PRIV(dev)->next)
584 if (PRIV(dev)->number >= number)
585 number = PRIV(dev)->number + 1;
587 dev = alloc_netdev(sizeof(struct clip_priv), "", clip_setup);
590 clip_priv = PRIV(dev);
591 sprintf(dev->name, "atm%d", number);
592 spin_lock_init(&clip_priv->xoff_lock);
593 clip_priv->number = number;
594 error = register_netdev(dev);
599 clip_priv->next = clip_devs;
601 DPRINTK("registered (net:%s)\n", dev->name);
605 static int clip_device_event(struct notifier_block *this, unsigned long event,
608 struct net_device *dev = arg;
610 if (event == NETDEV_UNREGISTER) {
611 neigh_ifdown(&clip_tbl, dev);
615 /* ignore non-CLIP devices */
616 if (dev->type != ARPHRD_ATM || dev->hard_start_xmit != clip_start_xmit)
621 DPRINTK("clip_device_event NETDEV_UP\n");
622 to_atmarpd(act_up, PRIV(dev)->number, 0);
624 case NETDEV_GOING_DOWN:
625 DPRINTK("clip_device_event NETDEV_DOWN\n");
626 to_atmarpd(act_down, PRIV(dev)->number, 0);
629 case NETDEV_CHANGEMTU:
630 DPRINTK("clip_device_event NETDEV_CHANGE*\n");
631 to_atmarpd(act_change, PRIV(dev)->number, 0);
637 static int clip_inet_event(struct notifier_block *this, unsigned long event,
640 struct in_device *in_dev;
642 in_dev = ((struct in_ifaddr *)ifa)->ifa_dev;
643 if (!in_dev || !in_dev->dev) {
644 printk(KERN_WARNING "clip_inet_event: no device\n");
648 * Transitions are of the down-change-up type, so it's sufficient to
649 * handle the change on up.
651 if (event != NETDEV_UP)
653 return clip_device_event(this, NETDEV_CHANGE, in_dev->dev);
657 static struct notifier_block clip_dev_notifier = {
658 .notifier_call = clip_device_event,
663 static struct notifier_block clip_inet_notifier = {
664 .notifier_call = clip_inet_event,
669 static void atmarpd_close(struct atm_vcc *vcc)
671 DPRINTK("atmarpd_close\n");
675 skb_queue_purge(&sk_atm(vcc)->sk_receive_queue);
679 module_put(THIS_MODULE);
683 static struct atmdev_ops atmarpd_dev_ops = {
684 .close = atmarpd_close
688 static struct atm_dev atmarpd_dev = {
689 .ops = &atmarpd_dev_ops,
692 .lock = SPIN_LOCK_UNLOCKED
696 static int atm_init_atmarp(struct atm_vcc *vcc)
704 mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
707 set_bit(ATM_VF_META,&vcc->flags);
708 set_bit(ATM_VF_READY,&vcc->flags);
709 /* allow replies and avoid getting closed if signaling dies */
710 vcc->dev = &atmarpd_dev;
711 vcc_insert_socket(sk_atm(vcc));
713 vcc->pop = NULL; /* crash */
714 vcc->push_oam = NULL; /* crash */
719 static int clip_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
721 struct atm_vcc *vcc = ATM_SD(sock);
728 case ATMARP_SETENTRY:
730 if (!capable(CAP_NET_ADMIN))
739 err = clip_create(arg);
742 err = atm_init_atmarp(vcc);
744 sock->state = SS_CONNECTED;
745 __module_get(THIS_MODULE);
749 err = clip_mkip(vcc, arg);
751 case ATMARP_SETENTRY:
752 err = clip_setentry(vcc, arg);
755 err = clip_encap(vcc, arg);
761 static struct atm_ioctl clip_ioctl_ops = {
762 .owner = THIS_MODULE,
766 #ifdef CONFIG_PROC_FS
768 static void svc_addr(struct seq_file *seq, struct sockaddr_atmsvc *addr)
770 static int code[] = { 1, 2, 10, 6, 1, 0 };
771 static int e164[] = { 1, 8, 4, 6, 1, 0 };
773 if (*addr->sas_addr.pub) {
774 seq_printf(seq, "%s", addr->sas_addr.pub);
775 if (*addr->sas_addr.prv)
777 } else if (!*addr->sas_addr.prv) {
778 seq_printf(seq, "%s", "(none)");
781 if (*addr->sas_addr.prv) {
782 unsigned char *prv = addr->sas_addr.prv;
786 fields = *prv == ATM_AFI_E164 ? e164 : code;
787 for (i = 0; fields[i]; i++) {
788 for (j = fields[i]; j; j--)
789 seq_printf(seq, "%02X", *prv++);
796 /* This means the neighbour entry has no attached VCC objects. */
797 #define SEQ_NO_VCC_TOKEN ((void *) 2)
799 static void atmarp_info(struct seq_file *seq, struct net_device *dev,
800 struct atmarp_entry *entry, struct clip_vcc *clip_vcc)
806 svc = ((clip_vcc == SEQ_NO_VCC_TOKEN) ||
807 (sk_atm(clip_vcc->vcc)->sk_family == AF_ATMSVC));
809 llc = ((clip_vcc == SEQ_NO_VCC_TOKEN) || clip_vcc->encap);
811 if (clip_vcc == SEQ_NO_VCC_TOKEN)
812 exp = entry->neigh->used;
814 exp = clip_vcc->last_use;
816 exp = (jiffies - exp) / HZ;
818 seq_printf(seq, "%-6s%-4s%-4s%5ld ",
819 dev->name, svc ? "SVC" : "PVC", llc ? "LLC" : "NULL", exp);
821 off = scnprintf(buf, sizeof(buf) - 1, "%d.%d.%d.%d",
826 seq_printf(seq, "%s", buf);
828 if (clip_vcc == SEQ_NO_VCC_TOKEN) {
829 if (time_before(jiffies, entry->expires))
830 seq_printf(seq, "(resolving)\n");
832 seq_printf(seq, "(expired, ref %d)\n",
833 atomic_read(&entry->neigh->refcnt));
835 seq_printf(seq, "%d.%d.%d\n",
836 clip_vcc->vcc->dev->number,
837 clip_vcc->vcc->vpi, clip_vcc->vcc->vci);
839 svc_addr(seq, &clip_vcc->vcc->remote);
844 struct clip_seq_state {
845 /* This member must be first. */
846 struct neigh_seq_state ns;
848 /* Local to clip specific iteration. */
849 struct clip_vcc *vcc;
852 static struct clip_vcc *clip_seq_next_vcc(struct atmarp_entry *e,
853 struct clip_vcc *curr)
858 return SEQ_NO_VCC_TOKEN;
861 if (curr == SEQ_NO_VCC_TOKEN)
869 static void *clip_seq_vcc_walk(struct clip_seq_state *state,
870 struct atmarp_entry *e, loff_t * pos)
872 struct clip_vcc *vcc = state->vcc;
874 vcc = clip_seq_next_vcc(e, vcc);
875 if (vcc && pos != NULL) {
877 vcc = clip_seq_next_vcc(e, vcc);
888 static void *clip_seq_sub_iter(struct neigh_seq_state *_state,
889 struct neighbour *n, loff_t * pos)
891 struct clip_seq_state *state = (struct clip_seq_state *)_state;
893 return clip_seq_vcc_walk(state, NEIGH2ENTRY(n), pos);
896 static void *clip_seq_start(struct seq_file *seq, loff_t * pos)
898 return neigh_seq_start(seq, pos, &clip_tbl, NEIGH_SEQ_NEIGH_ONLY);
901 static int clip_seq_show(struct seq_file *seq, void *v)
903 static char atm_arp_banner[] =
904 "IPitf TypeEncp Idle IP address ATM address\n";
906 if (v == SEQ_START_TOKEN) {
907 seq_puts(seq, atm_arp_banner);
909 struct clip_seq_state *state = seq->private;
910 struct neighbour *n = v;
911 struct clip_vcc *vcc = state->vcc;
913 atmarp_info(seq, n->dev, NEIGH2ENTRY(n), vcc);
918 static struct seq_operations arp_seq_ops = {
919 .start = clip_seq_start,
920 .next = neigh_seq_next,
921 .stop = neigh_seq_stop,
922 .show = clip_seq_show,
925 static int arp_seq_open(struct inode *inode, struct file *file)
927 struct clip_seq_state *state;
928 struct seq_file *seq;
931 state = kmalloc(sizeof(*state), GFP_KERNEL);
936 memset(state, 0, sizeof(*state));
937 state->ns.neigh_sub_iter = clip_seq_sub_iter;
939 rc = seq_open(file, &arp_seq_ops);
943 seq = file->private_data;
944 seq->private = state;
953 static struct file_operations arp_seq_fops = {
954 .open = arp_seq_open,
957 .release = seq_release_private,
962 static int __init atm_clip_init(void)
964 struct proc_dir_entry *p;
965 neigh_table_init_no_netlink(&clip_tbl);
967 clip_tbl_hook = &clip_tbl;
968 register_atm_ioctl(&clip_ioctl_ops);
969 register_netdevice_notifier(&clip_dev_notifier);
970 register_inetaddr_notifier(&clip_inet_notifier);
972 setup_timer(&idle_timer, idle_timer_check, 0);
974 p = create_proc_entry("arp", S_IRUGO, atm_proc_root);
976 p->proc_fops = &arp_seq_fops;
981 static void __exit atm_clip_exit(void)
983 struct net_device *dev, *next;
985 remove_proc_entry("arp", atm_proc_root);
987 unregister_inetaddr_notifier(&clip_inet_notifier);
988 unregister_netdevice_notifier(&clip_dev_notifier);
990 deregister_atm_ioctl(&clip_ioctl_ops);
992 /* First, stop the idle timer, so it stops banging
995 del_timer_sync(&idle_timer);
997 /* Next, purge the table, so that the device
998 * unregister loop below does not hang due to
999 * device references remaining in the table.
1001 neigh_ifdown(&clip_tbl, NULL);
1005 next = PRIV(dev)->next;
1006 unregister_netdev(dev);
1011 /* Now it is safe to fully shutdown whole table. */
1012 neigh_table_clear(&clip_tbl);
1014 clip_tbl_hook = NULL;
1017 module_init(atm_clip_init);
1018 module_exit(atm_clip_exit);
1019 MODULE_AUTHOR("Werner Almesberger");
1020 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1021 MODULE_LICENSE("GPL");