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 <net/route.h> /* for struct rtable and routing */
34 #include <net/icmp.h> /* icmp_send */
35 #include <linux/param.h> /* for HZ */
36 #include <linux/uaccess.h>
37 #include <asm/byteorder.h> /* for htons etc. */
38 #include <asm/system.h> /* save/restore_flags */
39 #include <asm/atomic.h>
42 #include "resources.h"
43 #include <net/atmclip.h>
45 static struct net_device
*clip_devs
;
46 static struct atm_vcc
*atmarpd
;
47 static struct neigh_table clip_tbl
;
48 static struct timer_list idle_timer
;
50 static int to_atmarpd(enum atmarp_ctrl_type type
, int itf
, __be32 ip
)
53 struct atmarp_ctrl
*ctrl
;
56 pr_debug("(%d)\n", type
);
59 skb
= alloc_skb(sizeof(struct atmarp_ctrl
), GFP_ATOMIC
);
62 ctrl
= (struct atmarp_ctrl
*)skb_put(skb
, sizeof(struct atmarp_ctrl
));
66 atm_force_charge(atmarpd
, skb
->truesize
);
69 skb_queue_tail(&sk
->sk_receive_queue
, skb
);
70 sk
->sk_data_ready(sk
, skb
->len
);
74 static void link_vcc(struct clip_vcc
*clip_vcc
, struct atmarp_entry
*entry
)
76 pr_debug("%p to entry %p (neigh %p)\n", clip_vcc
, entry
, entry
->neigh
);
77 clip_vcc
->entry
= entry
;
78 clip_vcc
->xoff
= 0; /* @@@ may overrun buffer by one packet */
79 clip_vcc
->next
= entry
->vccs
;
80 entry
->vccs
= clip_vcc
;
81 entry
->neigh
->used
= jiffies
;
84 static void unlink_clip_vcc(struct clip_vcc
*clip_vcc
)
86 struct atmarp_entry
*entry
= clip_vcc
->entry
;
87 struct clip_vcc
**walk
;
90 pr_crit("!clip_vcc->entry (clip_vcc %p)\n", clip_vcc
);
93 netif_tx_lock_bh(entry
->neigh
->dev
); /* block clip_start_xmit() */
94 entry
->neigh
->used
= jiffies
;
95 for (walk
= &entry
->vccs
; *walk
; walk
= &(*walk
)->next
)
96 if (*walk
== clip_vcc
) {
99 *walk
= clip_vcc
->next
; /* atomic */
100 clip_vcc
->entry
= NULL
;
102 netif_wake_queue(entry
->neigh
->dev
);
105 entry
->expires
= jiffies
- 1;
106 /* force resolution or expiration */
107 error
= neigh_update(entry
->neigh
, NULL
, NUD_NONE
,
108 NEIGH_UPDATE_F_ADMIN
);
110 pr_crit("neigh_update failed with %d\n", error
);
113 pr_crit("ATMARP: failed (entry %p, vcc 0x%p)\n", entry
, clip_vcc
);
115 netif_tx_unlock_bh(entry
->neigh
->dev
);
118 /* The neighbour entry n->lock is held. */
119 static int neigh_check_cb(struct neighbour
*n
)
121 struct atmarp_entry
*entry
= NEIGH2ENTRY(n
);
124 for (cv
= entry
->vccs
; cv
; cv
= cv
->next
) {
125 unsigned long exp
= cv
->last_use
+ cv
->idle_timeout
;
127 if (cv
->idle_timeout
&& time_after(jiffies
, exp
)) {
128 pr_debug("releasing vcc %p->%p of entry %p\n",
130 vcc_release_async(cv
->vcc
, -ETIMEDOUT
);
134 if (entry
->vccs
|| time_before(jiffies
, entry
->expires
))
137 if (atomic_read(&n
->refcnt
) > 1) {
140 pr_debug("destruction postponed with ref %d\n",
141 atomic_read(&n
->refcnt
));
143 while ((skb
= skb_dequeue(&n
->arp_queue
)) != NULL
)
149 pr_debug("expired neigh %p\n", n
);
153 static void idle_timer_check(unsigned long dummy
)
155 write_lock(&clip_tbl
.lock
);
156 __neigh_for_each_release(&clip_tbl
, neigh_check_cb
);
157 mod_timer(&idle_timer
, jiffies
+ CLIP_CHECK_INTERVAL
* HZ
);
158 write_unlock(&clip_tbl
.lock
);
161 static int clip_arp_rcv(struct sk_buff
*skb
)
166 vcc
= ATM_SKB(skb
)->vcc
;
167 if (!vcc
|| !atm_charge(vcc
, skb
->truesize
)) {
168 dev_kfree_skb_any(skb
);
171 pr_debug("pushing to %p\n", vcc
);
172 pr_debug("using %p\n", CLIP_VCC(vcc
)->old_push
);
173 CLIP_VCC(vcc
)->old_push(vcc
, skb
);
177 static const unsigned char llc_oui
[] = {
178 0xaa, /* DSAP: non-ISO */
179 0xaa, /* SSAP: non-ISO */
180 0x03, /* Ctrl: Unnumbered Information Command PDU */
181 0x00, /* OUI: EtherType */
186 static void clip_push(struct atm_vcc
*vcc
, struct sk_buff
*skb
)
188 struct clip_vcc
*clip_vcc
= CLIP_VCC(vcc
);
192 pr_debug("removing VCC %p\n", clip_vcc
);
194 unlink_clip_vcc(clip_vcc
);
195 clip_vcc
->old_push(vcc
, NULL
); /* pass on the bad news */
199 atm_return(vcc
, skb
->truesize
);
200 skb
->dev
= clip_vcc
->entry
? clip_vcc
->entry
->neigh
->dev
: clip_devs
;
201 /* clip_vcc->entry == NULL if we don't have an IP address yet */
203 dev_kfree_skb_any(skb
);
206 ATM_SKB(skb
)->vcc
= vcc
;
207 skb_reset_mac_header(skb
);
208 if (!clip_vcc
->encap
||
209 skb
->len
< RFC1483LLC_LEN
||
210 memcmp(skb
->data
, llc_oui
, sizeof(llc_oui
)))
211 skb
->protocol
= htons(ETH_P_IP
);
213 skb
->protocol
= ((__be16
*)skb
->data
)[3];
214 skb_pull(skb
, RFC1483LLC_LEN
);
215 if (skb
->protocol
== htons(ETH_P_ARP
)) {
216 skb
->dev
->stats
.rx_packets
++;
217 skb
->dev
->stats
.rx_bytes
+= skb
->len
;
222 clip_vcc
->last_use
= jiffies
;
223 skb
->dev
->stats
.rx_packets
++;
224 skb
->dev
->stats
.rx_bytes
+= skb
->len
;
225 memset(ATM_SKB(skb
), 0, sizeof(struct atm_skb_data
));
230 * Note: these spinlocks _must_not_ block on non-SMP. The only goal is that
231 * clip_pop is atomic with respect to the critical section in clip_start_xmit.
234 static void clip_pop(struct atm_vcc
*vcc
, struct sk_buff
*skb
)
236 struct clip_vcc
*clip_vcc
= CLIP_VCC(vcc
);
237 struct net_device
*dev
= skb
->dev
;
241 pr_debug("(vcc %p)\n", vcc
);
242 clip_vcc
->old_pop(vcc
, skb
);
243 /* skb->dev == NULL in outbound ARP packets */
246 spin_lock_irqsave(&PRIV(dev
)->xoff_lock
, flags
);
247 if (atm_may_send(vcc
, 0)) {
248 old
= xchg(&clip_vcc
->xoff
, 0);
250 netif_wake_queue(dev
);
252 spin_unlock_irqrestore(&PRIV(dev
)->xoff_lock
, flags
);
255 static void clip_neigh_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
)
257 pr_debug("(neigh %p, skb %p)\n", neigh
, skb
);
258 to_atmarpd(act_need
, PRIV(neigh
->dev
)->number
, NEIGH2ENTRY(neigh
)->ip
);
261 static void clip_neigh_error(struct neighbour
*neigh
, struct sk_buff
*skb
)
263 #ifndef CONFIG_ATM_CLIP_NO_ICMP
264 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_HOST_UNREACH
, 0);
269 static const struct neigh_ops clip_neigh_ops
= {
271 .solicit
= clip_neigh_solicit
,
272 .error_report
= clip_neigh_error
,
273 .output
= dev_queue_xmit
,
274 .connected_output
= dev_queue_xmit
,
275 .hh_output
= dev_queue_xmit
,
276 .queue_xmit
= dev_queue_xmit
,
279 static int clip_constructor(struct neighbour
*neigh
)
281 struct atmarp_entry
*entry
= NEIGH2ENTRY(neigh
);
282 struct net_device
*dev
= neigh
->dev
;
283 struct in_device
*in_dev
;
284 struct neigh_parms
*parms
;
286 pr_debug("(neigh %p, entry %p)\n", neigh
, entry
);
287 neigh
->type
= inet_addr_type(&init_net
, entry
->ip
);
288 if (neigh
->type
!= RTN_UNICAST
)
292 in_dev
= __in_dev_get_rcu(dev
);
298 parms
= in_dev
->arp_parms
;
299 __neigh_parms_put(neigh
->parms
);
300 neigh
->parms
= neigh_parms_clone(parms
);
303 neigh
->ops
= &clip_neigh_ops
;
304 neigh
->output
= neigh
->nud_state
& NUD_VALID
?
305 neigh
->ops
->connected_output
: neigh
->ops
->output
;
306 entry
->neigh
= neigh
;
308 entry
->expires
= jiffies
- 1;
312 static u32
clip_hash(const void *pkey
, const struct net_device
*dev
)
314 return jhash_2words(*(u32
*) pkey
, dev
->ifindex
, clip_tbl
.hash_rnd
);
317 static struct neigh_table clip_tbl
= {
319 .entry_size
= sizeof(struct neighbour
)+sizeof(struct atmarp_entry
),
322 .constructor
= clip_constructor
,
323 .id
= "clip_arp_cache",
325 /* parameters are copied from ARP ... */
328 .base_reachable_time
= 30 * HZ
,
329 .retrans_time
= 1 * HZ
,
330 .gc_staletime
= 60 * HZ
,
331 .reachable_time
= 30 * HZ
,
332 .delay_probe_time
= 5 * HZ
,
336 .anycast_delay
= 1 * HZ
,
337 .proxy_delay
= (8 * HZ
) / 10,
341 .gc_interval
= 30 * HZ
,
347 /* @@@ copy bh locking from arp.c -- need to bh-enable atm code before */
350 * We play with the resolve flag: 0 and 1 have the usual meaning, but -1 means
351 * to allocate the neighbour entry but not to ask atmarpd for resolution. Also,
352 * don't increment the usage count. This is used to create entries in
356 static int clip_encap(struct atm_vcc
*vcc
, int mode
)
358 CLIP_VCC(vcc
)->encap
= mode
;
362 static netdev_tx_t
clip_start_xmit(struct sk_buff
*skb
,
363 struct net_device
*dev
)
365 struct clip_priv
*clip_priv
= PRIV(dev
);
366 struct atmarp_entry
*entry
;
371 pr_debug("(skb %p)\n", skb
);
373 pr_err("skb_dst(skb) == NULL\n");
375 dev
->stats
.tx_dropped
++;
378 if (!skb_dst(skb
)->neighbour
) {
380 skb_dst(skb
)->neighbour
= clip_find_neighbour(skb_dst(skb
), 1);
381 if (!skb_dst(skb
)->neighbour
) {
382 dev_kfree_skb(skb
); /* lost that one */
383 dev
->stats
.tx_dropped
++;
387 pr_err("NO NEIGHBOUR !\n");
389 dev
->stats
.tx_dropped
++;
392 entry
= NEIGH2ENTRY(skb_dst(skb
)->neighbour
);
394 if (time_after(jiffies
, entry
->expires
)) {
395 /* should be resolved */
396 entry
->expires
= jiffies
+ ATMARP_RETRY_DELAY
* HZ
;
397 to_atmarpd(act_need
, PRIV(dev
)->number
, entry
->ip
);
399 if (entry
->neigh
->arp_queue
.qlen
< ATMARP_MAX_UNRES_PACKETS
)
400 skb_queue_tail(&entry
->neigh
->arp_queue
, skb
);
403 dev
->stats
.tx_dropped
++;
407 pr_debug("neigh %p, vccs %p\n", entry
, entry
->vccs
);
408 ATM_SKB(skb
)->vcc
= vcc
= entry
->vccs
->vcc
;
409 pr_debug("using neighbour %p, vcc %p\n", skb_dst(skb
)->neighbour
, vcc
);
410 if (entry
->vccs
->encap
) {
413 here
= skb_push(skb
, RFC1483LLC_LEN
);
414 memcpy(here
, llc_oui
, sizeof(llc_oui
));
415 ((__be16
*) here
)[3] = skb
->protocol
;
417 atomic_add(skb
->truesize
, &sk_atm(vcc
)->sk_wmem_alloc
);
418 ATM_SKB(skb
)->atm_options
= vcc
->atm_options
;
419 entry
->vccs
->last_use
= jiffies
;
420 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb
, vcc
, vcc
->dev
);
421 old
= xchg(&entry
->vccs
->xoff
, 1); /* assume XOFF ... */
423 pr_warning("XOFF->XOFF transition\n");
426 dev
->stats
.tx_packets
++;
427 dev
->stats
.tx_bytes
+= skb
->len
;
429 if (atm_may_send(vcc
, 0)) {
430 entry
->vccs
->xoff
= 0;
433 spin_lock_irqsave(&clip_priv
->xoff_lock
, flags
);
434 netif_stop_queue(dev
); /* XOFF -> throttle immediately */
436 if (!entry
->vccs
->xoff
)
437 netif_start_queue(dev
);
438 /* Oh, we just raced with clip_pop. netif_start_queue should be
439 good enough, because nothing should really be asleep because
440 of the brief netif_stop_queue. If this isn't true or if it
441 changes, use netif_wake_queue instead. */
442 spin_unlock_irqrestore(&clip_priv
->xoff_lock
, flags
);
446 static int clip_mkip(struct atm_vcc
*vcc
, int timeout
)
448 struct sk_buff_head
*rq
, queue
;
449 struct clip_vcc
*clip_vcc
;
450 struct sk_buff
*skb
, *tmp
;
455 clip_vcc
= kmalloc(sizeof(struct clip_vcc
), GFP_KERNEL
);
458 pr_debug("%p vcc %p\n", clip_vcc
, vcc
);
460 vcc
->user_back
= clip_vcc
;
461 set_bit(ATM_VF_IS_CLIP
, &vcc
->flags
);
462 clip_vcc
->entry
= NULL
;
465 clip_vcc
->last_use
= jiffies
;
466 clip_vcc
->idle_timeout
= timeout
* HZ
;
467 clip_vcc
->old_push
= vcc
->push
;
468 clip_vcc
->old_pop
= vcc
->pop
;
469 vcc
->push
= clip_push
;
472 __skb_queue_head_init(&queue
);
473 rq
= &sk_atm(vcc
)->sk_receive_queue
;
475 spin_lock_irqsave(&rq
->lock
, flags
);
476 skb_queue_splice_init(rq
, &queue
);
477 spin_unlock_irqrestore(&rq
->lock
, flags
);
479 /* re-process everything received between connection setup and MKIP */
480 skb_queue_walk_safe(&queue
, skb
, tmp
) {
482 atm_return(vcc
, skb
->truesize
);
485 struct net_device
*dev
= skb
->dev
;
486 unsigned int len
= skb
->len
;
490 dev
->stats
.rx_packets
--;
491 dev
->stats
.rx_bytes
-= len
;
498 static int clip_setentry(struct atm_vcc
*vcc
, __be32 ip
)
500 struct neighbour
*neigh
;
501 struct atmarp_entry
*entry
;
503 struct clip_vcc
*clip_vcc
;
504 struct flowi fl
= { .nl_u
= { .ip4_u
= { .daddr
= ip
, .tos
= 1}} };
507 if (vcc
->push
!= clip_push
) {
508 pr_warning("non-CLIP VCC\n");
511 clip_vcc
= CLIP_VCC(vcc
);
513 if (!clip_vcc
->entry
) {
514 pr_err("hiding hidden ATMARP entry\n");
517 pr_debug("remove\n");
518 unlink_clip_vcc(clip_vcc
);
521 error
= ip_route_output_key(&init_net
, &rt
, &fl
);
524 neigh
= __neigh_lookup(&clip_tbl
, &ip
, rt
->u
.dst
.dev
, 1);
528 entry
= NEIGH2ENTRY(neigh
);
529 if (entry
!= clip_vcc
->entry
) {
530 if (!clip_vcc
->entry
)
533 pr_debug("update\n");
534 unlink_clip_vcc(clip_vcc
);
536 link_vcc(clip_vcc
, entry
);
538 error
= neigh_update(neigh
, llc_oui
, NUD_PERMANENT
,
539 NEIGH_UPDATE_F_OVERRIDE
| NEIGH_UPDATE_F_ADMIN
);
540 neigh_release(neigh
);
544 static const struct net_device_ops clip_netdev_ops
= {
545 .ndo_start_xmit
= clip_start_xmit
,
548 static void clip_setup(struct net_device
*dev
)
550 dev
->netdev_ops
= &clip_netdev_ops
;
551 dev
->type
= ARPHRD_ATM
;
552 dev
->hard_header_len
= RFC1483LLC_LEN
;
553 dev
->mtu
= RFC1626_MTU
;
554 dev
->tx_queue_len
= 100; /* "normal" queue (packets) */
555 /* When using a "real" qdisc, the qdisc determines the queue */
556 /* length. tx_queue_len is only used for the default case, */
557 /* without any more elaborate queuing. 100 is a reasonable */
558 /* compromise between decent burst-tolerance and protection */
559 /* against memory hogs. */
560 dev
->priv_flags
&= ~IFF_XMIT_DST_RELEASE
;
563 static int clip_create(int number
)
565 struct net_device
*dev
;
566 struct clip_priv
*clip_priv
;
570 for (dev
= clip_devs
; dev
; dev
= PRIV(dev
)->next
)
571 if (PRIV(dev
)->number
== number
)
575 for (dev
= clip_devs
; dev
; dev
= PRIV(dev
)->next
)
576 if (PRIV(dev
)->number
>= number
)
577 number
= PRIV(dev
)->number
+ 1;
579 dev
= alloc_netdev(sizeof(struct clip_priv
), "", clip_setup
);
582 clip_priv
= PRIV(dev
);
583 sprintf(dev
->name
, "atm%d", number
);
584 spin_lock_init(&clip_priv
->xoff_lock
);
585 clip_priv
->number
= number
;
586 error
= register_netdev(dev
);
591 clip_priv
->next
= clip_devs
;
593 pr_debug("registered (net:%s)\n", dev
->name
);
597 static int clip_device_event(struct notifier_block
*this, unsigned long event
,
600 struct net_device
*dev
= arg
;
602 if (!net_eq(dev_net(dev
), &init_net
))
605 if (event
== NETDEV_UNREGISTER
) {
606 neigh_ifdown(&clip_tbl
, dev
);
610 /* ignore non-CLIP devices */
611 if (dev
->type
!= ARPHRD_ATM
|| dev
->netdev_ops
!= &clip_netdev_ops
)
616 pr_debug("NETDEV_UP\n");
617 to_atmarpd(act_up
, PRIV(dev
)->number
, 0);
619 case NETDEV_GOING_DOWN
:
620 pr_debug("NETDEV_DOWN\n");
621 to_atmarpd(act_down
, PRIV(dev
)->number
, 0);
624 case NETDEV_CHANGEMTU
:
625 pr_debug("NETDEV_CHANGE*\n");
626 to_atmarpd(act_change
, PRIV(dev
)->number
, 0);
632 static int clip_inet_event(struct notifier_block
*this, unsigned long event
,
635 struct in_device
*in_dev
;
637 in_dev
= ((struct in_ifaddr
*)ifa
)->ifa_dev
;
639 * Transitions are of the down-change-up type, so it's sufficient to
640 * handle the change on up.
642 if (event
!= NETDEV_UP
)
644 return clip_device_event(this, NETDEV_CHANGE
, in_dev
->dev
);
647 static struct notifier_block clip_dev_notifier
= {
648 .notifier_call
= clip_device_event
,
653 static struct notifier_block clip_inet_notifier
= {
654 .notifier_call
= clip_inet_event
,
659 static void atmarpd_close(struct atm_vcc
*vcc
)
665 skb_queue_purge(&sk_atm(vcc
)->sk_receive_queue
);
668 pr_debug("(done)\n");
669 module_put(THIS_MODULE
);
672 static struct atmdev_ops atmarpd_dev_ops
= {
673 .close
= atmarpd_close
677 static struct atm_dev atmarpd_dev
= {
678 .ops
= &atmarpd_dev_ops
,
681 .lock
= __SPIN_LOCK_UNLOCKED(atmarpd_dev
.lock
)
685 static int atm_init_atmarp(struct atm_vcc
*vcc
)
693 mod_timer(&idle_timer
, jiffies
+ CLIP_CHECK_INTERVAL
* HZ
);
696 set_bit(ATM_VF_META
, &vcc
->flags
);
697 set_bit(ATM_VF_READY
, &vcc
->flags
);
698 /* allow replies and avoid getting closed if signaling dies */
699 vcc
->dev
= &atmarpd_dev
;
700 vcc_insert_socket(sk_atm(vcc
));
702 vcc
->pop
= NULL
; /* crash */
703 vcc
->push_oam
= NULL
; /* crash */
708 static int clip_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
710 struct atm_vcc
*vcc
= ATM_SD(sock
);
717 case ATMARP_SETENTRY
:
719 if (!capable(CAP_NET_ADMIN
))
728 err
= clip_create(arg
);
731 err
= atm_init_atmarp(vcc
);
733 sock
->state
= SS_CONNECTED
;
734 __module_get(THIS_MODULE
);
738 err
= clip_mkip(vcc
, arg
);
740 case ATMARP_SETENTRY
:
741 err
= clip_setentry(vcc
, (__force __be32
)arg
);
744 err
= clip_encap(vcc
, arg
);
750 static struct atm_ioctl clip_ioctl_ops
= {
751 .owner
= THIS_MODULE
,
755 #ifdef CONFIG_PROC_FS
757 static void svc_addr(struct seq_file
*seq
, struct sockaddr_atmsvc
*addr
)
759 static int code
[] = { 1, 2, 10, 6, 1, 0 };
760 static int e164
[] = { 1, 8, 4, 6, 1, 0 };
762 if (*addr
->sas_addr
.pub
) {
763 seq_printf(seq
, "%s", addr
->sas_addr
.pub
);
764 if (*addr
->sas_addr
.prv
)
766 } else if (!*addr
->sas_addr
.prv
) {
767 seq_printf(seq
, "%s", "(none)");
770 if (*addr
->sas_addr
.prv
) {
771 unsigned char *prv
= addr
->sas_addr
.prv
;
775 fields
= *prv
== ATM_AFI_E164
? e164
: code
;
776 for (i
= 0; fields
[i
]; i
++) {
777 for (j
= fields
[i
]; j
; j
--)
778 seq_printf(seq
, "%02X", *prv
++);
785 /* This means the neighbour entry has no attached VCC objects. */
786 #define SEQ_NO_VCC_TOKEN ((void *) 2)
788 static void atmarp_info(struct seq_file
*seq
, struct net_device
*dev
,
789 struct atmarp_entry
*entry
, struct clip_vcc
*clip_vcc
)
795 svc
= ((clip_vcc
== SEQ_NO_VCC_TOKEN
) ||
796 (sk_atm(clip_vcc
->vcc
)->sk_family
== AF_ATMSVC
));
798 llc
= ((clip_vcc
== SEQ_NO_VCC_TOKEN
) || clip_vcc
->encap
);
800 if (clip_vcc
== SEQ_NO_VCC_TOKEN
)
801 exp
= entry
->neigh
->used
;
803 exp
= clip_vcc
->last_use
;
805 exp
= (jiffies
- exp
) / HZ
;
807 seq_printf(seq
, "%-6s%-4s%-4s%5ld ",
808 dev
->name
, svc
? "SVC" : "PVC", llc
? "LLC" : "NULL", exp
);
810 off
= scnprintf(buf
, sizeof(buf
) - 1, "%pI4",
815 seq_printf(seq
, "%s", buf
);
817 if (clip_vcc
== SEQ_NO_VCC_TOKEN
) {
818 if (time_before(jiffies
, entry
->expires
))
819 seq_printf(seq
, "(resolving)\n");
821 seq_printf(seq
, "(expired, ref %d)\n",
822 atomic_read(&entry
->neigh
->refcnt
));
824 seq_printf(seq
, "%d.%d.%d\n",
825 clip_vcc
->vcc
->dev
->number
,
826 clip_vcc
->vcc
->vpi
, clip_vcc
->vcc
->vci
);
828 svc_addr(seq
, &clip_vcc
->vcc
->remote
);
833 struct clip_seq_state
{
834 /* This member must be first. */
835 struct neigh_seq_state ns
;
837 /* Local to clip specific iteration. */
838 struct clip_vcc
*vcc
;
841 static struct clip_vcc
*clip_seq_next_vcc(struct atmarp_entry
*e
,
842 struct clip_vcc
*curr
)
847 return SEQ_NO_VCC_TOKEN
;
850 if (curr
== SEQ_NO_VCC_TOKEN
)
858 static void *clip_seq_vcc_walk(struct clip_seq_state
*state
,
859 struct atmarp_entry
*e
, loff_t
* pos
)
861 struct clip_vcc
*vcc
= state
->vcc
;
863 vcc
= clip_seq_next_vcc(e
, vcc
);
864 if (vcc
&& pos
!= NULL
) {
866 vcc
= clip_seq_next_vcc(e
, vcc
);
877 static void *clip_seq_sub_iter(struct neigh_seq_state
*_state
,
878 struct neighbour
*n
, loff_t
* pos
)
880 struct clip_seq_state
*state
= (struct clip_seq_state
*)_state
;
882 return clip_seq_vcc_walk(state
, NEIGH2ENTRY(n
), pos
);
885 static void *clip_seq_start(struct seq_file
*seq
, loff_t
* pos
)
887 struct clip_seq_state
*state
= seq
->private;
888 state
->ns
.neigh_sub_iter
= clip_seq_sub_iter
;
889 return neigh_seq_start(seq
, pos
, &clip_tbl
, NEIGH_SEQ_NEIGH_ONLY
);
892 static int clip_seq_show(struct seq_file
*seq
, void *v
)
894 static char atm_arp_banner
[] =
895 "IPitf TypeEncp Idle IP address ATM address\n";
897 if (v
== SEQ_START_TOKEN
) {
898 seq_puts(seq
, atm_arp_banner
);
900 struct clip_seq_state
*state
= seq
->private;
901 struct neighbour
*n
= v
;
902 struct clip_vcc
*vcc
= state
->vcc
;
904 atmarp_info(seq
, n
->dev
, NEIGH2ENTRY(n
), vcc
);
909 static const struct seq_operations arp_seq_ops
= {
910 .start
= clip_seq_start
,
911 .next
= neigh_seq_next
,
912 .stop
= neigh_seq_stop
,
913 .show
= clip_seq_show
,
916 static int arp_seq_open(struct inode
*inode
, struct file
*file
)
918 return seq_open_net(inode
, file
, &arp_seq_ops
,
919 sizeof(struct clip_seq_state
));
922 static const struct file_operations arp_seq_fops
= {
923 .open
= arp_seq_open
,
926 .release
= seq_release_net
,
931 static void atm_clip_exit_noproc(void);
933 static int __init
atm_clip_init(void)
935 neigh_table_init_no_netlink(&clip_tbl
);
937 clip_tbl_hook
= &clip_tbl
;
938 register_atm_ioctl(&clip_ioctl_ops
);
939 register_netdevice_notifier(&clip_dev_notifier
);
940 register_inetaddr_notifier(&clip_inet_notifier
);
942 setup_timer(&idle_timer
, idle_timer_check
, 0);
944 #ifdef CONFIG_PROC_FS
946 struct proc_dir_entry
*p
;
948 p
= proc_create("arp", S_IRUGO
, atm_proc_root
, &arp_seq_fops
);
950 pr_err("Unable to initialize /proc/net/atm/arp\n");
951 atm_clip_exit_noproc();
960 static void atm_clip_exit_noproc(void)
962 struct net_device
*dev
, *next
;
964 unregister_inetaddr_notifier(&clip_inet_notifier
);
965 unregister_netdevice_notifier(&clip_dev_notifier
);
967 deregister_atm_ioctl(&clip_ioctl_ops
);
969 /* First, stop the idle timer, so it stops banging
972 del_timer_sync(&idle_timer
);
974 /* Next, purge the table, so that the device
975 * unregister loop below does not hang due to
976 * device references remaining in the table.
978 neigh_ifdown(&clip_tbl
, NULL
);
982 next
= PRIV(dev
)->next
;
983 unregister_netdev(dev
);
988 /* Now it is safe to fully shutdown whole table. */
989 neigh_table_clear(&clip_tbl
);
991 clip_tbl_hook
= NULL
;
994 static void __exit
atm_clip_exit(void)
996 remove_proc_entry("arp", atm_proc_root
);
998 atm_clip_exit_noproc();
1001 module_init(atm_clip_init
);
1002 module_exit(atm_clip_exit
);
1003 MODULE_AUTHOR("Werner Almesberger");
1004 MODULE_DESCRIPTION("Classical/IP over ATM interface");
1005 MODULE_LICENSE("GPL");