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
);
194 atm_return(vcc
, skb
->truesize
);
200 pr_debug("removing VCC %p\n", clip_vcc
);
202 unlink_clip_vcc(clip_vcc
);
203 clip_vcc
->old_push(vcc
, NULL
); /* pass on the bad news */
207 atm_return(vcc
, skb
->truesize
);
208 skb
->dev
= clip_vcc
->entry
? clip_vcc
->entry
->neigh
->dev
: clip_devs
;
209 /* clip_vcc->entry == NULL if we don't have an IP address yet */
211 dev_kfree_skb_any(skb
);
214 ATM_SKB(skb
)->vcc
= vcc
;
215 skb_reset_mac_header(skb
);
216 if (!clip_vcc
->encap
||
217 skb
->len
< RFC1483LLC_LEN
||
218 memcmp(skb
->data
, llc_oui
, sizeof(llc_oui
)))
219 skb
->protocol
= htons(ETH_P_IP
);
221 skb
->protocol
= ((__be16
*)skb
->data
)[3];
222 skb_pull(skb
, RFC1483LLC_LEN
);
223 if (skb
->protocol
== htons(ETH_P_ARP
)) {
224 skb
->dev
->stats
.rx_packets
++;
225 skb
->dev
->stats
.rx_bytes
+= skb
->len
;
230 clip_vcc
->last_use
= jiffies
;
231 skb
->dev
->stats
.rx_packets
++;
232 skb
->dev
->stats
.rx_bytes
+= skb
->len
;
233 memset(ATM_SKB(skb
), 0, sizeof(struct atm_skb_data
));
238 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
239 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
242 static void clip_pop(struct atm_vcc
*vcc
, struct sk_buff
*skb
)
244 struct clip_vcc
*clip_vcc
= CLIP_VCC(vcc
);
245 struct net_device
*dev
= skb
->dev
;
249 pr_debug("(vcc %p)\n", vcc
);
250 clip_vcc
->old_pop(vcc
, skb
);
251 /* skb->dev == NULL in outbound ARP packets */
254 spin_lock_irqsave(&PRIV(dev
)->xoff_lock
, flags
);
255 if (atm_may_send(vcc
, 0)) {
256 old
= xchg(&clip_vcc
->xoff
, 0);
258 netif_wake_queue(dev
);
260 spin_unlock_irqrestore(&PRIV(dev
)->xoff_lock
, flags
);
263 static void clip_neigh_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
)
265 pr_debug("(neigh %p, skb %p)\n", neigh
, skb
);
266 to_atmarpd(act_need
, PRIV(neigh
->dev
)->number
, NEIGH2ENTRY(neigh
)->ip
);
269 static void clip_neigh_error(struct neighbour
*neigh
, struct sk_buff
*skb
)
271 #ifndef CONFIG_ATM_CLIP_NO_ICMP
272 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_HOST_UNREACH
, 0);
277 static const struct neigh_ops clip_neigh_ops
= {
279 .solicit
= clip_neigh_solicit
,
280 .error_report
= clip_neigh_error
,
281 .output
= neigh_direct_output
,
282 .connected_output
= neigh_direct_output
,
285 static int clip_constructor(struct neighbour
*neigh
)
287 struct atmarp_entry
*entry
= NEIGH2ENTRY(neigh
);
288 struct net_device
*dev
= neigh
->dev
;
289 struct in_device
*in_dev
;
290 struct neigh_parms
*parms
;
292 pr_debug("(neigh %p, entry %p)\n", neigh
, entry
);
293 neigh
->type
= inet_addr_type(&init_net
, entry
->ip
);
294 if (neigh
->type
!= RTN_UNICAST
)
298 in_dev
= __in_dev_get_rcu(dev
);
304 parms
= in_dev
->arp_parms
;
305 __neigh_parms_put(neigh
->parms
);
306 neigh
->parms
= neigh_parms_clone(parms
);
309 neigh
->ops
= &clip_neigh_ops
;
310 neigh
->output
= neigh
->nud_state
& NUD_VALID
?
311 neigh
->ops
->connected_output
: neigh
->ops
->output
;
312 entry
->neigh
= neigh
;
314 entry
->expires
= jiffies
- 1;
318 static u32
clip_hash(const void *pkey
, const struct net_device
*dev
, __u32 rnd
)
320 return jhash_2words(*(u32
*) pkey
, dev
->ifindex
, rnd
);
323 static struct neigh_table clip_tbl
= {
325 .entry_size
= sizeof(struct neighbour
)+sizeof(struct atmarp_entry
),
328 .constructor
= clip_constructor
,
329 .id
= "clip_arp_cache",
331 /* parameters are copied from ARP ... */
334 .base_reachable_time
= 30 * HZ
,
335 .retrans_time
= 1 * HZ
,
336 .gc_staletime
= 60 * HZ
,
337 .reachable_time
= 30 * HZ
,
338 .delay_probe_time
= 5 * HZ
,
339 .queue_len_bytes
= 64 * 1024,
342 .anycast_delay
= 1 * HZ
,
343 .proxy_delay
= (8 * HZ
) / 10,
347 .gc_interval
= 30 * HZ
,
353 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
356 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
357 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
358 * don't increment the usage count. This is used to create entries in
362 static int clip_encap(struct atm_vcc
*vcc
, int mode
)
364 CLIP_VCC(vcc
)->encap
= mode
;
368 static netdev_tx_t
clip_start_xmit(struct sk_buff
*skb
,
369 struct net_device
*dev
)
371 struct clip_priv
*clip_priv
= PRIV(dev
);
372 struct dst_entry
*dst
= skb_dst(skb
);
373 struct atmarp_entry
*entry
;
379 pr_debug("(skb %p)\n", skb
);
381 pr_err("skb_dst(skb) == NULL\n");
383 dev
->stats
.tx_dropped
++;
386 n
= dst_get_neighbour(dst
);
389 n
= clip_find_neighbour(skb_dst(skb
), 1);
391 dev_kfree_skb(skb
); /* lost that one */
392 dev
->stats
.tx_dropped
++;
395 dst_set_neighbour(dst
, n
);
397 pr_err("NO NEIGHBOUR !\n");
399 dev
->stats
.tx_dropped
++;
402 entry
= NEIGH2ENTRY(n
);
404 if (time_after(jiffies
, entry
->expires
)) {
405 /* should be resolved */
406 entry
->expires
= jiffies
+ ATMARP_RETRY_DELAY
* HZ
;
407 to_atmarpd(act_need
, PRIV(dev
)->number
, entry
->ip
);
409 if (entry
->neigh
->arp_queue
.qlen
< ATMARP_MAX_UNRES_PACKETS
)
410 skb_queue_tail(&entry
->neigh
->arp_queue
, skb
);
413 dev
->stats
.tx_dropped
++;
417 pr_debug("neigh %p, vccs %p\n", entry
, entry
->vccs
);
418 ATM_SKB(skb
)->vcc
= vcc
= entry
->vccs
->vcc
;
419 pr_debug("using neighbour %p, vcc %p\n", n
, vcc
);
420 if (entry
->vccs
->encap
) {
423 here
= skb_push(skb
, RFC1483LLC_LEN
);
424 memcpy(here
, llc_oui
, sizeof(llc_oui
));
425 ((__be16
*) here
)[3] = skb
->protocol
;
427 atomic_add(skb
->truesize
, &sk_atm(vcc
)->sk_wmem_alloc
);
428 ATM_SKB(skb
)->atm_options
= vcc
->atm_options
;
429 entry
->vccs
->last_use
= jiffies
;
430 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb
, vcc
, vcc
->dev
);
431 old
= xchg(&entry
->vccs
->xoff
, 1); /* assume XOFF ... */
433 pr_warning("XOFF->XOFF transition\n");
436 dev
->stats
.tx_packets
++;
437 dev
->stats
.tx_bytes
+= skb
->len
;
439 if (atm_may_send(vcc
, 0)) {
440 entry
->vccs
->xoff
= 0;
443 spin_lock_irqsave(&clip_priv
->xoff_lock
, flags
);
444 netif_stop_queue(dev
); /* XOFF -> throttle immediately */
446 if (!entry
->vccs
->xoff
)
447 netif_start_queue(dev
);
448 /* Oh, we just raced with clip_pop. netif_start_queue should be
449 good enough, because nothing should really be asleep because
450 of the brief netif_stop_queue. If this isn't true or if it
451 changes, use netif_wake_queue instead. */
452 spin_unlock_irqrestore(&clip_priv
->xoff_lock
, flags
);
456 static int clip_mkip(struct atm_vcc
*vcc
, int timeout
)
458 struct clip_vcc
*clip_vcc
;
462 clip_vcc
= kmalloc(sizeof(struct clip_vcc
), GFP_KERNEL
);
465 pr_debug("%p vcc %p\n", clip_vcc
, vcc
);
467 vcc
->user_back
= clip_vcc
;
468 set_bit(ATM_VF_IS_CLIP
, &vcc
->flags
);
469 clip_vcc
->entry
= NULL
;
472 clip_vcc
->last_use
= jiffies
;
473 clip_vcc
->idle_timeout
= timeout
* HZ
;
474 clip_vcc
->old_push
= vcc
->push
;
475 clip_vcc
->old_pop
= vcc
->pop
;
476 vcc
->push
= clip_push
;
479 /* re-process everything received between connection setup and MKIP */
480 vcc_process_recv_queue(vcc
);
485 static int clip_setentry(struct atm_vcc
*vcc
, __be32 ip
)
487 struct neighbour
*neigh
;
488 struct atmarp_entry
*entry
;
490 struct clip_vcc
*clip_vcc
;
493 if (vcc
->push
!= clip_push
) {
494 pr_warning("non-CLIP VCC\n");
497 clip_vcc
= CLIP_VCC(vcc
);
499 if (!clip_vcc
->entry
) {
500 pr_err("hiding hidden ATMARP entry\n");
503 pr_debug("remove\n");
504 unlink_clip_vcc(clip_vcc
);
507 rt
= ip_route_output(&init_net
, ip
, 0, 1, 0);
510 neigh
= __neigh_lookup(&clip_tbl
, &ip
, rt
->dst
.dev
, 1);
514 entry
= NEIGH2ENTRY(neigh
);
515 if (entry
!= clip_vcc
->entry
) {
516 if (!clip_vcc
->entry
)
519 pr_debug("update\n");
520 unlink_clip_vcc(clip_vcc
);
522 link_vcc(clip_vcc
, entry
);
524 error
= neigh_update(neigh
, llc_oui
, NUD_PERMANENT
,
525 NEIGH_UPDATE_F_OVERRIDE
| NEIGH_UPDATE_F_ADMIN
);
526 neigh_release(neigh
);
530 static const struct net_device_ops clip_netdev_ops
= {
531 .ndo_start_xmit
= clip_start_xmit
,
534 static void clip_setup(struct net_device
*dev
)
536 dev
->netdev_ops
= &clip_netdev_ops
;
537 dev
->type
= ARPHRD_ATM
;
538 dev
->hard_header_len
= RFC1483LLC_LEN
;
539 dev
->mtu
= RFC1626_MTU
;
540 dev
->tx_queue_len
= 100; /* "normal" queue (packets) */
541 /* When using a "real" qdisc, the qdisc determines the queue */
542 /* length. tx_queue_len is only used for the default case, */
543 /* without any more elaborate queuing. 100 is a reasonable */
544 /* compromise between decent burst-tolerance and protection */
545 /* against memory hogs. */
546 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
549 static int clip_create(int number
)
551 struct net_device
*dev
;
552 struct clip_priv
*clip_priv
;
556 for (dev
= clip_devs
; dev
; dev
= PRIV(dev
)->next
)
557 if (PRIV(dev
)->number
== number
)
561 for (dev
= clip_devs
; dev
; dev
= PRIV(dev
)->next
)
562 if (PRIV(dev
)->number
>= number
)
563 number
= PRIV(dev
)->number
+ 1;
565 dev
= alloc_netdev(sizeof(struct clip_priv
), "", clip_setup
);
568 clip_priv
= PRIV(dev
);
569 sprintf(dev
->name
, "atm%d", number
);
570 spin_lock_init(&clip_priv
->xoff_lock
);
571 clip_priv
->number
= number
;
572 error
= register_netdev(dev
);
577 clip_priv
->next
= clip_devs
;
579 pr_debug("registered (net:%s)\n", dev
->name
);
583 static int clip_device_event(struct notifier_block
*this, unsigned long event
,
586 struct net_device
*dev
= arg
;
588 if (!net_eq(dev_net(dev
), &init_net
))
591 if (event
== NETDEV_UNREGISTER
) {
592 neigh_ifdown(&clip_tbl
, dev
);
596 /* ignore non-CLIP devices */
597 if (dev
->type
!= ARPHRD_ATM
|| dev
->netdev_ops
!= &clip_netdev_ops
)
602 pr_debug("NETDEV_UP\n");
603 to_atmarpd(act_up
, PRIV(dev
)->number
, 0);
605 case NETDEV_GOING_DOWN
:
606 pr_debug("NETDEV_DOWN\n");
607 to_atmarpd(act_down
, PRIV(dev
)->number
, 0);
610 case NETDEV_CHANGEMTU
:
611 pr_debug("NETDEV_CHANGE*\n");
612 to_atmarpd(act_change
, PRIV(dev
)->number
, 0);
618 static int clip_inet_event(struct notifier_block
*this, unsigned long event
,
621 struct in_device
*in_dev
;
623 in_dev
= ((struct in_ifaddr
*)ifa
)->ifa_dev
;
625 * Transitions are of the down-change-up type, so it's sufficient to
626 * handle the change on up.
628 if (event
!= NETDEV_UP
)
630 return clip_device_event(this, NETDEV_CHANGE
, in_dev
->dev
);
633 static struct notifier_block clip_dev_notifier
= {
634 .notifier_call
= clip_device_event
,
639 static struct notifier_block clip_inet_notifier
= {
640 .notifier_call
= clip_inet_event
,
645 static void atmarpd_close(struct atm_vcc
*vcc
)
651 skb_queue_purge(&sk_atm(vcc
)->sk_receive_queue
);
654 pr_debug("(done)\n");
655 module_put(THIS_MODULE
);
658 static struct atmdev_ops atmarpd_dev_ops
= {
659 .close
= atmarpd_close
663 static struct atm_dev atmarpd_dev
= {
664 .ops
= &atmarpd_dev_ops
,
667 .lock
= __SPIN_LOCK_UNLOCKED(atmarpd_dev
.lock
)
671 static int atm_init_atmarp(struct atm_vcc
*vcc
)
679 mod_timer(&idle_timer
, jiffies
+ CLIP_CHECK_INTERVAL
* HZ
);
682 set_bit(ATM_VF_META
, &vcc
->flags
);
683 set_bit(ATM_VF_READY
, &vcc
->flags
);
684 /* allow replies and avoid getting closed if signaling dies */
685 vcc
->dev
= &atmarpd_dev
;
686 vcc_insert_socket(sk_atm(vcc
));
688 vcc
->pop
= NULL
; /* crash */
689 vcc
->push_oam
= NULL
; /* crash */
694 static int clip_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
696 struct atm_vcc
*vcc
= ATM_SD(sock
);
703 case ATMARP_SETENTRY
:
705 if (!capable(CAP_NET_ADMIN
))
714 err
= clip_create(arg
);
717 err
= atm_init_atmarp(vcc
);
719 sock
->state
= SS_CONNECTED
;
720 __module_get(THIS_MODULE
);
724 err
= clip_mkip(vcc
, arg
);
726 case ATMARP_SETENTRY
:
727 err
= clip_setentry(vcc
, (__force __be32
)arg
);
730 err
= clip_encap(vcc
, arg
);
736 static struct atm_ioctl clip_ioctl_ops
= {
737 .owner
= THIS_MODULE
,
741 #ifdef CONFIG_PROC_FS
743 static void svc_addr(struct seq_file
*seq
, struct sockaddr_atmsvc
*addr
)
745 static int code
[] = { 1, 2, 10, 6, 1, 0 };
746 static int e164
[] = { 1, 8, 4, 6, 1, 0 };
748 if (*addr
->sas_addr
.pub
) {
749 seq_printf(seq
, "%s", addr
->sas_addr
.pub
);
750 if (*addr
->sas_addr
.prv
)
752 } else if (!*addr
->sas_addr
.prv
) {
753 seq_printf(seq
, "%s", "(none)");
756 if (*addr
->sas_addr
.prv
) {
757 unsigned char *prv
= addr
->sas_addr
.prv
;
761 fields
= *prv
== ATM_AFI_E164
? e164
: code
;
762 for (i
= 0; fields
[i
]; i
++) {
763 for (j
= fields
[i
]; j
; j
--)
764 seq_printf(seq
, "%02X", *prv
++);
771 /* This means the neighbour entry has no attached VCC objects. */
772 #define SEQ_NO_VCC_TOKEN ((void *) 2)
774 static void atmarp_info(struct seq_file
*seq
, struct net_device
*dev
,
775 struct atmarp_entry
*entry
, struct clip_vcc
*clip_vcc
)
781 svc
= ((clip_vcc
== SEQ_NO_VCC_TOKEN
) ||
782 (sk_atm(clip_vcc
->vcc
)->sk_family
== AF_ATMSVC
));
784 llc
= ((clip_vcc
== SEQ_NO_VCC_TOKEN
) || clip_vcc
->encap
);
786 if (clip_vcc
== SEQ_NO_VCC_TOKEN
)
787 exp
= entry
->neigh
->used
;
789 exp
= clip_vcc
->last_use
;
791 exp
= (jiffies
- exp
) / HZ
;
793 seq_printf(seq
, "%-6s%-4s%-4s%5ld ",
794 dev
->name
, svc
? "SVC" : "PVC", llc
? "LLC" : "NULL", exp
);
796 off
= scnprintf(buf
, sizeof(buf
) - 1, "%pI4",
801 seq_printf(seq
, "%s", buf
);
803 if (clip_vcc
== SEQ_NO_VCC_TOKEN
) {
804 if (time_before(jiffies
, entry
->expires
))
805 seq_printf(seq
, "(resolving)\n");
807 seq_printf(seq
, "(expired, ref %d)\n",
808 atomic_read(&entry
->neigh
->refcnt
));
810 seq_printf(seq
, "%d.%d.%d\n",
811 clip_vcc
->vcc
->dev
->number
,
812 clip_vcc
->vcc
->vpi
, clip_vcc
->vcc
->vci
);
814 svc_addr(seq
, &clip_vcc
->vcc
->remote
);
819 struct clip_seq_state
{
820 /* This member must be first. */
821 struct neigh_seq_state ns
;
823 /* Local to clip specific iteration. */
824 struct clip_vcc
*vcc
;
827 static struct clip_vcc
*clip_seq_next_vcc(struct atmarp_entry
*e
,
828 struct clip_vcc
*curr
)
833 return SEQ_NO_VCC_TOKEN
;
836 if (curr
== SEQ_NO_VCC_TOKEN
)
844 static void *clip_seq_vcc_walk(struct clip_seq_state
*state
,
845 struct atmarp_entry
*e
, loff_t
* pos
)
847 struct clip_vcc
*vcc
= state
->vcc
;
849 vcc
= clip_seq_next_vcc(e
, vcc
);
850 if (vcc
&& pos
!= NULL
) {
852 vcc
= clip_seq_next_vcc(e
, vcc
);
863 static void *clip_seq_sub_iter(struct neigh_seq_state
*_state
,
864 struct neighbour
*n
, loff_t
* pos
)
866 struct clip_seq_state
*state
= (struct clip_seq_state
*)_state
;
868 return clip_seq_vcc_walk(state
, NEIGH2ENTRY(n
), pos
);
871 static void *clip_seq_start(struct seq_file
*seq
, loff_t
* pos
)
873 struct clip_seq_state
*state
= seq
->private;
874 state
->ns
.neigh_sub_iter
= clip_seq_sub_iter
;
875 return neigh_seq_start(seq
, pos
, &clip_tbl
, NEIGH_SEQ_NEIGH_ONLY
);
878 static int clip_seq_show(struct seq_file
*seq
, void *v
)
880 static char atm_arp_banner
[] =
881 "IPitf TypeEncp Idle IP address ATM address\n";
883 if (v
== SEQ_START_TOKEN
) {
884 seq_puts(seq
, atm_arp_banner
);
886 struct clip_seq_state
*state
= seq
->private;
887 struct neighbour
*n
= v
;
888 struct clip_vcc
*vcc
= state
->vcc
;
890 atmarp_info(seq
, n
->dev
, NEIGH2ENTRY(n
), vcc
);
895 static const struct seq_operations arp_seq_ops
= {
896 .start
= clip_seq_start
,
897 .next
= neigh_seq_next
,
898 .stop
= neigh_seq_stop
,
899 .show
= clip_seq_show
,
902 static int arp_seq_open(struct inode
*inode
, struct file
*file
)
904 return seq_open_net(inode
, file
, &arp_seq_ops
,
905 sizeof(struct clip_seq_state
));
908 static const struct file_operations arp_seq_fops
= {
909 .open
= arp_seq_open
,
912 .release
= seq_release_net
,
917 static void atm_clip_exit_noproc(void);
919 static int __init
atm_clip_init(void)
921 neigh_table_init_no_netlink(&clip_tbl
);
923 clip_tbl_hook
= &clip_tbl
;
924 register_atm_ioctl(&clip_ioctl_ops
);
925 register_netdevice_notifier(&clip_dev_notifier
);
926 register_inetaddr_notifier(&clip_inet_notifier
);
928 setup_timer(&idle_timer
, idle_timer_check
, 0);
930 #ifdef CONFIG_PROC_FS
932 struct proc_dir_entry
*p
;
934 p
= proc_create("arp", S_IRUGO
, atm_proc_root
, &arp_seq_fops
);
936 pr_err("Unable to initialize /proc/net/atm/arp\n");
937 atm_clip_exit_noproc();
946 static void atm_clip_exit_noproc(void)
948 struct net_device
*dev
, *next
;
950 unregister_inetaddr_notifier(&clip_inet_notifier
);
951 unregister_netdevice_notifier(&clip_dev_notifier
);
953 deregister_atm_ioctl(&clip_ioctl_ops
);
955 /* First, stop the idle timer, so it stops banging
958 del_timer_sync(&idle_timer
);
960 /* Next, purge the table, so that the device
961 * unregister loop below does not hang due to
962 * device references remaining in the table.
964 neigh_ifdown(&clip_tbl
, NULL
);
968 next
= PRIV(dev
)->next
;
969 unregister_netdev(dev
);
974 /* Now it is safe to fully shutdown whole table. */
975 neigh_table_clear(&clip_tbl
);
977 clip_tbl_hook
= NULL
;
980 static void __exit
atm_clip_exit(void)
982 remove_proc_entry("arp", atm_proc_root
);
984 atm_clip_exit_noproc();
987 module_init(atm_clip_init
);
988 module_exit(atm_clip_exit
);
989 MODULE_AUTHOR("Werner Almesberger");
990 MODULE_DESCRIPTION("Classical/IP over ATM interface");
991 MODULE_LICENSE("GPL");