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32#include <linux/if_arp.h>
33#include <net/sock.h>
34#include <net/datalink.h>
35#include <net/psnap.h>
36#include <linux/atalk.h>
37#include <linux/delay.h>
38#include <linux/init.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41
42int sysctl_aarp_expiry_time = AARP_EXPIRY_TIME;
43int sysctl_aarp_tick_time = AARP_TICK_TIME;
44int sysctl_aarp_retransmit_limit = AARP_RETRANSMIT_LIMIT;
45int sysctl_aarp_resolve_time = AARP_RESOLVE_TIME;
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60struct aarp_entry {
61
62 unsigned long last_sent;
63 struct sk_buff_head packet_queue;
64 int status;
65 unsigned long expires_at;
66 struct atalk_addr target_addr;
67 struct net_device *dev;
68 char hwaddr[6];
69 unsigned short xmit_count;
70 struct aarp_entry *next;
71};
72
73
74static struct aarp_entry *resolved[AARP_HASH_SIZE];
75static struct aarp_entry *unresolved[AARP_HASH_SIZE];
76static struct aarp_entry *proxies[AARP_HASH_SIZE];
77static int unresolved_count;
78
79
80static DEFINE_RWLOCK(aarp_lock);
81
82
83static struct timer_list aarp_timer;
84
85
86
87
88
89
90static void __aarp_expire(struct aarp_entry *a)
91{
92 skb_queue_purge(&a->packet_queue);
93 kfree(a);
94}
95
96
97
98
99
100
101static void __aarp_send_query(struct aarp_entry *a)
102{
103 static unsigned char aarp_eth_multicast[ETH_ALEN] =
104 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
105 struct net_device *dev = a->dev;
106 struct elapaarp *eah;
107 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
108 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
109 struct atalk_addr *sat = atalk_find_dev_addr(dev);
110
111 if (!skb)
112 return;
113
114 if (!sat) {
115 kfree_skb(skb);
116 return;
117 }
118
119
120 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
121 skb_reset_network_header(skb);
122 skb_reset_transport_header(skb);
123 skb_put(skb, sizeof(*eah));
124 skb->protocol = htons(ETH_P_ATALK);
125 skb->dev = dev;
126 eah = aarp_hdr(skb);
127
128
129 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
130 eah->pa_type = htons(ETH_P_ATALK);
131 eah->hw_len = ETH_ALEN;
132 eah->pa_len = AARP_PA_ALEN;
133 eah->function = htons(AARP_REQUEST);
134
135 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
136
137 eah->pa_src_zero = 0;
138 eah->pa_src_net = sat->s_net;
139 eah->pa_src_node = sat->s_node;
140
141 memset(eah->hw_dst, '\0', ETH_ALEN);
142
143 eah->pa_dst_zero = 0;
144 eah->pa_dst_net = a->target_addr.s_net;
145 eah->pa_dst_node = a->target_addr.s_node;
146
147
148 aarp_dl->request(aarp_dl, skb, aarp_eth_multicast);
149
150 a->xmit_count++;
151 a->last_sent = jiffies;
152}
153
154
155
156static void aarp_send_reply(struct net_device *dev, struct atalk_addr *us,
157 struct atalk_addr *them, unsigned char *sha)
158{
159 struct elapaarp *eah;
160 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
161 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
162
163 if (!skb)
164 return;
165
166
167 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
168 skb_reset_network_header(skb);
169 skb_reset_transport_header(skb);
170 skb_put(skb, sizeof(*eah));
171 skb->protocol = htons(ETH_P_ATALK);
172 skb->dev = dev;
173 eah = aarp_hdr(skb);
174
175
176 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
177 eah->pa_type = htons(ETH_P_ATALK);
178 eah->hw_len = ETH_ALEN;
179 eah->pa_len = AARP_PA_ALEN;
180 eah->function = htons(AARP_REPLY);
181
182 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
183
184 eah->pa_src_zero = 0;
185 eah->pa_src_net = us->s_net;
186 eah->pa_src_node = us->s_node;
187
188 if (!sha)
189 memset(eah->hw_dst, '\0', ETH_ALEN);
190 else
191 memcpy(eah->hw_dst, sha, ETH_ALEN);
192
193 eah->pa_dst_zero = 0;
194 eah->pa_dst_net = them->s_net;
195 eah->pa_dst_node = them->s_node;
196
197
198 aarp_dl->request(aarp_dl, skb, sha);
199}
200
201
202
203
204
205
206static void aarp_send_probe(struct net_device *dev, struct atalk_addr *us)
207{
208 struct elapaarp *eah;
209 int len = dev->hard_header_len + sizeof(*eah) + aarp_dl->header_length;
210 struct sk_buff *skb = alloc_skb(len, GFP_ATOMIC);
211 static unsigned char aarp_eth_multicast[ETH_ALEN] =
212 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
213
214 if (!skb)
215 return;
216
217
218 skb_reserve(skb, dev->hard_header_len + aarp_dl->header_length);
219 skb_reset_network_header(skb);
220 skb_reset_transport_header(skb);
221 skb_put(skb, sizeof(*eah));
222 skb->protocol = htons(ETH_P_ATALK);
223 skb->dev = dev;
224 eah = aarp_hdr(skb);
225
226
227 eah->hw_type = htons(AARP_HW_TYPE_ETHERNET);
228 eah->pa_type = htons(ETH_P_ATALK);
229 eah->hw_len = ETH_ALEN;
230 eah->pa_len = AARP_PA_ALEN;
231 eah->function = htons(AARP_PROBE);
232
233 memcpy(eah->hw_src, dev->dev_addr, ETH_ALEN);
234
235 eah->pa_src_zero = 0;
236 eah->pa_src_net = us->s_net;
237 eah->pa_src_node = us->s_node;
238
239 memset(eah->hw_dst, '\0', ETH_ALEN);
240
241 eah->pa_dst_zero = 0;
242 eah->pa_dst_net = us->s_net;
243 eah->pa_dst_node = us->s_node;
244
245
246 aarp_dl->request(aarp_dl, skb, aarp_eth_multicast);
247}
248
249
250
251
252
253
254
255static void __aarp_expire_timer(struct aarp_entry **n)
256{
257 struct aarp_entry *t;
258
259 while (*n)
260
261 if (time_after(jiffies, (*n)->expires_at)) {
262 t = *n;
263 *n = (*n)->next;
264 __aarp_expire(t);
265 } else
266 n = &((*n)->next);
267}
268
269
270
271
272
273
274static void __aarp_kick(struct aarp_entry **n)
275{
276 struct aarp_entry *t;
277
278 while (*n)
279
280 if ((*n)->xmit_count >= sysctl_aarp_retransmit_limit) {
281 t = *n;
282 *n = (*n)->next;
283 __aarp_expire(t);
284 } else {
285 __aarp_send_query(*n);
286 n = &((*n)->next);
287 }
288}
289
290
291
292
293
294
295
296static void __aarp_expire_device(struct aarp_entry **n, struct net_device *dev)
297{
298 struct aarp_entry *t;
299
300 while (*n)
301 if ((*n)->dev == dev) {
302 t = *n;
303 *n = (*n)->next;
304 __aarp_expire(t);
305 } else
306 n = &((*n)->next);
307}
308
309
310static void aarp_expire_timeout(unsigned long unused)
311{
312 int ct;
313
314 write_lock_bh(&aarp_lock);
315
316 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
317 __aarp_expire_timer(&resolved[ct]);
318 __aarp_kick(&unresolved[ct]);
319 __aarp_expire_timer(&unresolved[ct]);
320 __aarp_expire_timer(&proxies[ct]);
321 }
322
323 write_unlock_bh(&aarp_lock);
324 mod_timer(&aarp_timer, jiffies +
325 (unresolved_count ? sysctl_aarp_tick_time :
326 sysctl_aarp_expiry_time));
327}
328
329
330static int aarp_device_event(struct notifier_block *this, unsigned long event,
331 void *ptr)
332{
333 struct net_device *dev = ptr;
334 int ct;
335
336 if (!net_eq(dev_net(dev), &init_net))
337 return NOTIFY_DONE;
338
339 if (event == NETDEV_DOWN) {
340 write_lock_bh(&aarp_lock);
341
342 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
343 __aarp_expire_device(&resolved[ct], dev);
344 __aarp_expire_device(&unresolved[ct], dev);
345 __aarp_expire_device(&proxies[ct], dev);
346 }
347
348 write_unlock_bh(&aarp_lock);
349 }
350 return NOTIFY_DONE;
351}
352
353
354static void __aarp_expire_all(struct aarp_entry **n)
355{
356 struct aarp_entry *t;
357
358 while (*n) {
359 t = *n;
360 *n = (*n)->next;
361 __aarp_expire(t);
362 }
363}
364
365
366static void aarp_purge(void)
367{
368 int ct;
369
370 write_lock_bh(&aarp_lock);
371 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
372 __aarp_expire_all(&resolved[ct]);
373 __aarp_expire_all(&unresolved[ct]);
374 __aarp_expire_all(&proxies[ct]);
375 }
376 write_unlock_bh(&aarp_lock);
377}
378
379
380
381
382
383static struct aarp_entry *aarp_alloc(void)
384{
385 struct aarp_entry *a = kmalloc(sizeof(*a), GFP_ATOMIC);
386
387 if (a)
388 skb_queue_head_init(&a->packet_queue);
389 return a;
390}
391
392
393
394
395
396
397
398static struct aarp_entry *__aarp_find_entry(struct aarp_entry *list,
399 struct net_device *dev,
400 struct atalk_addr *sat)
401{
402 while (list) {
403 if (list->target_addr.s_net == sat->s_net &&
404 list->target_addr.s_node == sat->s_node &&
405 list->dev == dev)
406 break;
407 list = list->next;
408 }
409
410 return list;
411}
412
413
414void aarp_proxy_remove(struct net_device *dev, struct atalk_addr *sa)
415{
416 int hash = sa->s_node % (AARP_HASH_SIZE - 1);
417 struct aarp_entry *a;
418
419 write_lock_bh(&aarp_lock);
420
421 a = __aarp_find_entry(proxies[hash], dev, sa);
422 if (a)
423 a->expires_at = jiffies - 1;
424
425 write_unlock_bh(&aarp_lock);
426}
427
428
429static struct atalk_addr *__aarp_proxy_find(struct net_device *dev,
430 struct atalk_addr *sa)
431{
432 int hash = sa->s_node % (AARP_HASH_SIZE - 1);
433 struct aarp_entry *a = __aarp_find_entry(proxies[hash], dev, sa);
434
435 return a ? sa : NULL;
436}
437
438
439
440
441
442static void aarp_send_probe_phase1(struct atalk_iface *iface)
443{
444 struct ifreq atreq;
445 struct sockaddr_at *sa = (struct sockaddr_at *)&atreq.ifr_addr;
446 const struct net_device_ops *ops = iface->dev->netdev_ops;
447
448 sa->sat_addr.s_node = iface->address.s_node;
449 sa->sat_addr.s_net = ntohs(iface->address.s_net);
450
451
452 if (!(ops->ndo_do_ioctl(iface->dev, &atreq, SIOCSIFADDR))) {
453 ops->ndo_do_ioctl(iface->dev, &atreq, SIOCGIFADDR);
454 if (iface->address.s_net != htons(sa->sat_addr.s_net) ||
455 iface->address.s_node != sa->sat_addr.s_node)
456 iface->status |= ATIF_PROBE_FAIL;
457
458 iface->address.s_net = htons(sa->sat_addr.s_net);
459 iface->address.s_node = sa->sat_addr.s_node;
460 }
461}
462
463
464void aarp_probe_network(struct atalk_iface *atif)
465{
466 if (atif->dev->type == ARPHRD_LOCALTLK ||
467 atif->dev->type == ARPHRD_PPP)
468 aarp_send_probe_phase1(atif);
469 else {
470 unsigned int count;
471
472 for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) {
473 aarp_send_probe(atif->dev, &atif->address);
474
475
476 msleep(100);
477
478 if (atif->status & ATIF_PROBE_FAIL)
479 break;
480 }
481 }
482}
483
484int aarp_proxy_probe_network(struct atalk_iface *atif, struct atalk_addr *sa)
485{
486 int hash, retval = -EPROTONOSUPPORT;
487 struct aarp_entry *entry;
488 unsigned int count;
489
490
491
492
493
494 if (atif->dev->type == ARPHRD_LOCALTLK ||
495 atif->dev->type == ARPHRD_PPP)
496 goto out;
497
498
499
500
501
502 entry = aarp_alloc();
503 retval = -ENOMEM;
504 if (!entry)
505 goto out;
506
507 entry->expires_at = -1;
508 entry->status = ATIF_PROBE;
509 entry->target_addr.s_node = sa->s_node;
510 entry->target_addr.s_net = sa->s_net;
511 entry->dev = atif->dev;
512
513 write_lock_bh(&aarp_lock);
514
515 hash = sa->s_node % (AARP_HASH_SIZE - 1);
516 entry->next = proxies[hash];
517 proxies[hash] = entry;
518
519 for (count = 0; count < AARP_RETRANSMIT_LIMIT; count++) {
520 aarp_send_probe(atif->dev, sa);
521
522
523 write_unlock_bh(&aarp_lock);
524 msleep(100);
525 write_lock_bh(&aarp_lock);
526
527 if (entry->status & ATIF_PROBE_FAIL)
528 break;
529 }
530
531 if (entry->status & ATIF_PROBE_FAIL) {
532 entry->expires_at = jiffies - 1;
533 retval = -EADDRINUSE;
534 } else {
535 entry->status &= ~ATIF_PROBE;
536 retval = 1;
537 }
538
539 write_unlock_bh(&aarp_lock);
540out:
541 return retval;
542}
543
544
545int aarp_send_ddp(struct net_device *dev, struct sk_buff *skb,
546 struct atalk_addr *sa, void *hwaddr)
547{
548 static char ddp_eth_multicast[ETH_ALEN] =
549 { 0x09, 0x00, 0x07, 0xFF, 0xFF, 0xFF };
550 int hash;
551 struct aarp_entry *a;
552
553 skb_reset_network_header(skb);
554
555
556 if (dev->type == ARPHRD_LOCALTLK) {
557 struct atalk_addr *at = atalk_find_dev_addr(dev);
558 struct ddpehdr *ddp = (struct ddpehdr *)skb->data;
559 int ft = 2;
560
561
562
563
564
565
566
567
568 if ((!ddp->deh_snet || at->s_net == ddp->deh_snet) &&
569 (!ddp->deh_dnet || at->s_net == ddp->deh_dnet)) {
570 skb_pull(skb, sizeof(*ddp) - 4);
571
572
573
574
575
576
577 *((__be16 *)skb->data) = htons(skb->len);
578 ft = 1;
579 }
580
581
582
583
584
585 skb_push(skb, 3);
586 skb->data[0] = sa->s_node;
587 skb->data[1] = at->s_node;
588 skb->data[2] = ft;
589 skb->dev = dev;
590 goto sendit;
591 }
592
593
594 if (dev->type == ARPHRD_PPP) {
595 skb->protocol = htons(ETH_P_PPPTALK);
596 skb->dev = dev;
597 goto sendit;
598 }
599
600
601 if (dev->type != ARPHRD_ETHER)
602 goto free_it;
603
604 skb->dev = dev;
605 skb->protocol = htons(ETH_P_ATALK);
606 hash = sa->s_node % (AARP_HASH_SIZE - 1);
607
608
609 if (sa->s_node == ATADDR_BCAST) {
610
611 ddp_dl->request(ddp_dl, skb, ddp_eth_multicast);
612 goto sent;
613 }
614
615 write_lock_bh(&aarp_lock);
616 a = __aarp_find_entry(resolved[hash], dev, sa);
617
618 if (a) {
619 a->expires_at = jiffies + (sysctl_aarp_expiry_time * 10);
620 ddp_dl->request(ddp_dl, skb, a->hwaddr);
621 write_unlock_bh(&aarp_lock);
622 goto sent;
623 }
624
625
626 a = __aarp_find_entry(unresolved[hash], dev, sa);
627 if (a) {
628 skb_queue_tail(&a->packet_queue, skb);
629 goto out_unlock;
630 }
631
632
633 a = aarp_alloc();
634 if (!a) {
635
636 write_unlock_bh(&aarp_lock);
637 goto free_it;
638 }
639
640
641 skb_queue_tail(&a->packet_queue, skb);
642 a->expires_at = jiffies + sysctl_aarp_resolve_time;
643 a->dev = dev;
644 a->next = unresolved[hash];
645 a->target_addr = *sa;
646 a->xmit_count = 0;
647 unresolved[hash] = a;
648 unresolved_count++;
649
650
651 __aarp_send_query(a);
652
653
654
655
656
657
658 if (unresolved_count == 1)
659 mod_timer(&aarp_timer, jiffies + sysctl_aarp_tick_time);
660
661
662out_unlock:
663 write_unlock_bh(&aarp_lock);
664
665
666 goto sent;
667
668sendit:
669 if (skb->sk)
670 skb->priority = skb->sk->sk_priority;
671 if (dev_queue_xmit(skb))
672 goto drop;
673sent:
674 return NET_XMIT_SUCCESS;
675free_it:
676 kfree_skb(skb);
677drop:
678 return NET_XMIT_DROP;
679}
680EXPORT_SYMBOL(aarp_send_ddp);
681
682
683
684
685
686
687
688static void __aarp_resolved(struct aarp_entry **list, struct aarp_entry *a,
689 int hash)
690{
691 struct sk_buff *skb;
692
693 while (*list)
694 if (*list == a) {
695 unresolved_count--;
696 *list = a->next;
697
698
699 a->next = resolved[hash];
700 resolved[hash] = a;
701
702
703 while ((skb = skb_dequeue(&a->packet_queue)) != NULL) {
704 a->expires_at = jiffies +
705 sysctl_aarp_expiry_time * 10;
706 ddp_dl->request(ddp_dl, skb, a->hwaddr);
707 }
708 } else
709 list = &((*list)->next);
710}
711
712
713
714
715
716static int aarp_rcv(struct sk_buff *skb, struct net_device *dev,
717 struct packet_type *pt, struct net_device *orig_dev)
718{
719 struct elapaarp *ea = aarp_hdr(skb);
720 int hash, ret = 0;
721 __u16 function;
722 struct aarp_entry *a;
723 struct atalk_addr sa, *ma, da;
724 struct atalk_iface *ifa;
725
726 if (!net_eq(dev_net(dev), &init_net))
727 goto out0;
728
729
730 if (dev->type != ARPHRD_ETHER)
731 goto out0;
732
733
734 if (!skb_pull(skb, sizeof(*ea)))
735 goto out0;
736
737 function = ntohs(ea->function);
738
739
740 if (function < AARP_REQUEST || function > AARP_PROBE ||
741 ea->hw_len != ETH_ALEN || ea->pa_len != AARP_PA_ALEN ||
742 ea->pa_src_zero || ea->pa_dst_zero)
743 goto out0;
744
745
746 hash = ea->pa_src_node % (AARP_HASH_SIZE - 1);
747
748
749 sa.s_node = ea->pa_src_node;
750 sa.s_net = ea->pa_src_net;
751
752
753 ifa = atalk_find_dev(dev);
754 if (!ifa)
755 goto out1;
756
757 if (ifa->status & ATIF_PROBE &&
758 ifa->address.s_node == ea->pa_dst_node &&
759 ifa->address.s_net == ea->pa_dst_net) {
760 ifa->status |= ATIF_PROBE_FAIL;
761 goto out1;
762 }
763
764
765 da.s_node = ea->pa_dst_node;
766 da.s_net = ea->pa_dst_net;
767
768 write_lock_bh(&aarp_lock);
769 a = __aarp_find_entry(proxies[hash], dev, &da);
770
771 if (a && a->status & ATIF_PROBE) {
772 a->status |= ATIF_PROBE_FAIL;
773
774
775
776
777 goto unlock;
778 }
779
780 switch (function) {
781 case AARP_REPLY:
782 if (!unresolved_count)
783 break;
784
785
786 a = __aarp_find_entry(unresolved[hash], dev, &sa);
787 if (!a || dev != a->dev)
788 break;
789
790
791 memcpy(a->hwaddr, ea->hw_src, ETH_ALEN);
792 __aarp_resolved(&unresolved[hash], a, hash);
793 if (!unresolved_count)
794 mod_timer(&aarp_timer,
795 jiffies + sysctl_aarp_expiry_time);
796 break;
797
798 case AARP_REQUEST:
799 case AARP_PROBE:
800
801
802
803
804
805
806
807
808
809
810
811
812
813 sa.s_node = ea->pa_dst_node;
814 sa.s_net = ea->pa_dst_net;
815
816
817 ma = __aarp_proxy_find(dev, &sa);
818 if (!ma)
819 ma = &ifa->address;
820 else {
821 da.s_node = sa.s_node;
822 da.s_net = da.s_net;
823 ma = &da;
824 }
825
826 if (function == AARP_PROBE) {
827
828
829
830
831
832 a = __aarp_find_entry(resolved[sa.s_node %
833 (AARP_HASH_SIZE - 1)],
834 skb->dev, &sa);
835
836
837
838
839
840
841
842 if (a) {
843 a->expires_at = jiffies - 1;
844 mod_timer(&aarp_timer, jiffies +
845 sysctl_aarp_tick_time);
846 }
847 }
848
849 if (sa.s_node != ma->s_node)
850 break;
851
852 if (sa.s_net && ma->s_net && sa.s_net != ma->s_net)
853 break;
854
855 sa.s_node = ea->pa_src_node;
856 sa.s_net = ea->pa_src_net;
857
858
859
860 aarp_send_reply(dev, ma, &sa, ea->hw_src);
861 break;
862 }
863
864unlock:
865 write_unlock_bh(&aarp_lock);
866out1:
867 ret = 1;
868out0:
869 kfree_skb(skb);
870 return ret;
871}
872
873static struct notifier_block aarp_notifier = {
874 .notifier_call = aarp_device_event,
875};
876
877static unsigned char aarp_snap_id[] = { 0x00, 0x00, 0x00, 0x80, 0xF3 };
878
879void __init aarp_proto_init(void)
880{
881 aarp_dl = register_snap_client(aarp_snap_id, aarp_rcv);
882 if (!aarp_dl)
883 printk(KERN_CRIT "Unable to register AARP with SNAP.\n");
884 setup_timer(&aarp_timer, aarp_expire_timeout, 0);
885 aarp_timer.expires = jiffies + sysctl_aarp_expiry_time;
886 add_timer(&aarp_timer);
887 register_netdevice_notifier(&aarp_notifier);
888}
889
890
891void aarp_device_down(struct net_device *dev)
892{
893 int ct;
894
895 write_lock_bh(&aarp_lock);
896
897 for (ct = 0; ct < AARP_HASH_SIZE; ct++) {
898 __aarp_expire_device(&resolved[ct], dev);
899 __aarp_expire_device(&unresolved[ct], dev);
900 __aarp_expire_device(&proxies[ct], dev);
901 }
902
903 write_unlock_bh(&aarp_lock);
904}
905
906#ifdef CONFIG_PROC_FS
907struct aarp_iter_state {
908 int bucket;
909 struct aarp_entry **table;
910};
911
912
913
914
915
916
917
918static struct aarp_entry *iter_next(struct aarp_iter_state *iter, loff_t *pos)
919{
920 int ct = iter->bucket;
921 struct aarp_entry **table = iter->table;
922 loff_t off = 0;
923 struct aarp_entry *entry;
924
925 rescan:
926 while(ct < AARP_HASH_SIZE) {
927 for (entry = table[ct]; entry; entry = entry->next) {
928 if (!pos || ++off == *pos) {
929 iter->table = table;
930 iter->bucket = ct;
931 return entry;
932 }
933 }
934 ++ct;
935 }
936
937 if (table == resolved) {
938 ct = 0;
939 table = unresolved;
940 goto rescan;
941 }
942 if (table == unresolved) {
943 ct = 0;
944 table = proxies;
945 goto rescan;
946 }
947 return NULL;
948}
949
950static void *aarp_seq_start(struct seq_file *seq, loff_t *pos)
951 __acquires(aarp_lock)
952{
953 struct aarp_iter_state *iter = seq->private;
954
955 read_lock_bh(&aarp_lock);
956 iter->table = resolved;
957 iter->bucket = 0;
958
959 return *pos ? iter_next(iter, pos) : SEQ_START_TOKEN;
960}
961
962static void *aarp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
963{
964 struct aarp_entry *entry = v;
965 struct aarp_iter_state *iter = seq->private;
966
967 ++*pos;
968
969
970 if (v == SEQ_START_TOKEN)
971 entry = iter_next(iter, NULL);
972
973
974 else if (entry->next)
975 entry = entry->next;
976
977
978 else {
979 ++iter->bucket;
980 entry = iter_next(iter, NULL);
981 }
982 return entry;
983}
984
985static void aarp_seq_stop(struct seq_file *seq, void *v)
986 __releases(aarp_lock)
987{
988 read_unlock_bh(&aarp_lock);
989}
990
991static const char *dt2str(unsigned long ticks)
992{
993 static char buf[32];
994
995 sprintf(buf, "%ld.%02ld", ticks / HZ, ((ticks % HZ) * 100 ) / HZ);
996
997 return buf;
998}
999
1000static int aarp_seq_show(struct seq_file *seq, void *v)
1001{
1002 struct aarp_iter_state *iter = seq->private;
1003 struct aarp_entry *entry = v;
1004 unsigned long now = jiffies;
1005
1006 if (v == SEQ_START_TOKEN)
1007 seq_puts(seq,
1008 "Address Interface Hardware Address"
1009 " Expires LastSend Retry Status\n");
1010 else {
1011 seq_printf(seq, "%04X:%02X %-12s",
1012 ntohs(entry->target_addr.s_net),
1013 (unsigned int) entry->target_addr.s_node,
1014 entry->dev ? entry->dev->name : "????");
1015 seq_printf(seq, "%pM", entry->hwaddr);
1016 seq_printf(seq, " %8s",
1017 dt2str((long)entry->expires_at - (long)now));
1018 if (iter->table == unresolved)
1019 seq_printf(seq, " %8s %6hu",
1020 dt2str(now - entry->last_sent),
1021 entry->xmit_count);
1022 else
1023 seq_puts(seq, " ");
1024 seq_printf(seq, " %s\n",
1025 (iter->table == resolved) ? "resolved"
1026 : (iter->table == unresolved) ? "unresolved"
1027 : (iter->table == proxies) ? "proxies"
1028 : "unknown");
1029 }
1030 return 0;
1031}
1032
1033static const struct seq_operations aarp_seq_ops = {
1034 .start = aarp_seq_start,
1035 .next = aarp_seq_next,
1036 .stop = aarp_seq_stop,
1037 .show = aarp_seq_show,
1038};
1039
1040static int aarp_seq_open(struct inode *inode, struct file *file)
1041{
1042 return seq_open_private(file, &aarp_seq_ops,
1043 sizeof(struct aarp_iter_state));
1044}
1045
1046const struct file_operations atalk_seq_arp_fops = {
1047 .owner = THIS_MODULE,
1048 .open = aarp_seq_open,
1049 .read = seq_read,
1050 .llseek = seq_lseek,
1051 .release = seq_release_private,
1052};
1053#endif
1054
1055
1056void aarp_cleanup_module(void)
1057{
1058 del_timer_sync(&aarp_timer);
1059 unregister_netdevice_notifier(&aarp_notifier);
1060 unregister_snap_client(aarp_dl);
1061 aarp_purge();
1062}
1063