This source file includes following definitions.
- arp_check_expire
- arp_release_entry
- arp_device_down
- arp_send
- arp_expire_request
- arp_send_q
- arp_destroy
- arp_rcv
- arp_find
- arp_get_info
- arp_lookup
- arp_req_set
- arp_req_get
- arp_ioctl
- arp_init
1
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32
33 #include <linux/types.h>
34 #include <linux/string.h>
35 #include <linux/kernel.h>
36 #include <linux/sched.h>
37 #include <linux/config.h>
38 #include <linux/socket.h>
39 #include <linux/sockios.h>
40 #include <linux/errno.h>
41 #include <linux/if_arp.h>
42 #include <linux/in.h>
43 #include <asm/system.h>
44 #include <asm/segment.h>
45 #include <stdarg.h>
46 #include <linux/inet.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include "ip.h"
50 #include "route.h"
51 #include "protocol.h"
52 #include "tcp.h"
53 #include <linux/skbuff.h>
54 #include "sock.h"
55 #include "arp.h"
56 #ifdef CONFIG_AX25
57 #include "ax25.h"
58 #endif
59
60
61
62
63
64
65
66
67 struct arp_table
68 {
69 struct arp_table *next;
70 unsigned long last_used;
71 unsigned int flags;
72 unsigned long ip;
73 unsigned char ha[MAX_ADDR_LEN];
74 unsigned char hlen;
75 unsigned short htype;
76 struct device *dev;
77
78
79
80
81
82 struct timer_list timer;
83 int retries;
84 struct sk_buff_head skb;
85 };
86
87
88
89
90
91 struct arphdr
92 {
93 unsigned short ar_hrd;
94 unsigned short ar_pro;
95 unsigned char ar_hln;
96 unsigned char ar_pln;
97 unsigned short ar_op;
98
99 #if 0
100
101
102
103 unsigned char ar_sha[ETH_ALEN];
104 unsigned char ar_sip[4];
105 unsigned char ar_tha[ETH_ALEN];
106 unsigned char ar_tip[4];
107 #endif
108
109 };
110
111
112
113
114
115
116
117
118
119
120 #define ARP_RES_TIME (250*(HZ/10))
121
122
123
124
125
126
127 #define ARP_MAX_TRIES 3
128
129
130
131
132
133 #define ARP_TIMEOUT (600*HZ)
134
135
136
137
138
139
140
141 #define ARP_CHECK_INTERVAL (60 * HZ)
142
143
144 static void arp_check_expire (unsigned long);
145
146
147 static struct timer_list arp_timer =
148 { NULL, NULL, ARP_CHECK_INTERVAL, 0L, &arp_check_expire };
149
150
151
152
153
154
155
156 #define ARP_TABLE_SIZE 16
157
158 struct arp_table *arp_tables[ARP_TABLE_SIZE] =
159 {
160 NULL,
161 };
162
163
164
165
166
167 #define HASH(paddr) (htonl(paddr) & (ARP_TABLE_SIZE - 1))
168
169
170
171
172
173
174 static int proxies = 0;
175
176
177
178
179
180
181
182
183
184
185 static void arp_check_expire(unsigned long dummy)
186 {
187 int i;
188 unsigned long now = jiffies;
189 unsigned long flags;
190 save_flags(flags);
191 cli();
192
193 for (i = 0; i < ARP_TABLE_SIZE; i++)
194 {
195 struct arp_table *entry;
196 struct arp_table **pentry = &arp_tables[i];
197
198 while ((entry = *pentry) != NULL)
199 {
200 if ((now - entry->last_used) > ARP_TIMEOUT
201 && !(entry->flags & ATF_PERM))
202 {
203 *pentry = entry->next;
204 if (entry->flags & ATF_PUBL)
205 proxies--;
206 del_timer(&entry->timer);
207 kfree_s(entry, sizeof(struct arp_table));
208 }
209 else
210 pentry = &entry->next;
211 }
212 }
213 restore_flags(flags);
214
215
216
217
218
219 del_timer(&arp_timer);
220 arp_timer.expires = ARP_CHECK_INTERVAL;
221 add_timer(&arp_timer);
222 }
223
224
225
226
227
228
229 static void arp_release_entry(struct arp_table *entry)
230 {
231 struct sk_buff *skb;
232 unsigned long flags;
233
234 if (entry->flags & ATF_PUBL)
235 proxies--;
236
237 save_flags(flags);
238 cli();
239
240 while ((skb = skb_dequeue(&entry->skb)) != NULL)
241 {
242 skb_device_lock(skb);
243 restore_flags(flags);
244 dev_kfree_skb(skb, FREE_WRITE);
245 }
246 restore_flags(flags);
247 del_timer(&entry->timer);
248 kfree_s(entry, sizeof(struct arp_table));
249 return;
250 }
251
252
253
254
255
256 void arp_device_down(struct device *dev)
257 {
258 int i;
259 unsigned long flags;
260
261
262
263
264 save_flags(flags);
265 cli();
266 for (i = 0; i < ARP_TABLE_SIZE; i++)
267 {
268 struct arp_table *entry;
269 struct arp_table **pentry = &arp_tables[i];
270
271 while ((entry = *pentry) != NULL)
272 {
273 if(entry->dev==dev)
274 {
275 *pentry = entry->next;
276 if (entry->flags & ATF_PUBL)
277 proxies--;
278 del_timer(&entry->timer);
279 kfree_s(entry, sizeof(struct arp_table));
280 }
281 else
282 pentry = &entry->next;
283 }
284 }
285 restore_flags(flags);
286 }
287
288
289
290
291
292
293
294 void arp_send(int type, int ptype, unsigned long dest_ip,
295 struct device *dev, unsigned long src_ip,
296 unsigned char *dest_hw, unsigned char *src_hw)
297 {
298 struct sk_buff *skb;
299 struct arphdr *arp;
300 unsigned char *arp_ptr;
301
302
303
304
305
306 if(dev->flags&IFF_NOARP)
307 return;
308
309
310
311
312
313 skb = alloc_skb(sizeof(struct arphdr)+ 2*(dev->addr_len+4)
314 + dev->hard_header_len, GFP_ATOMIC);
315 if (skb == NULL)
316 {
317 printk("ARP: no memory to send an arp packet\n");
318 return;
319 }
320 skb->len = sizeof(struct arphdr) + dev->hard_header_len + 2*(dev->addr_len+4);
321 skb->arp = 1;
322 skb->dev = dev;
323 skb->free = 1;
324
325
326
327
328
329 dev->hard_header(skb->data,dev,ptype,dest_hw?dest_hw:dev->broadcast,src_hw?src_hw:NULL,skb->len,skb);
330
331
332 arp = (struct arphdr *) (skb->data + dev->hard_header_len);
333 arp->ar_hrd = htons(dev->type);
334 #ifdef CONFIG_AX25
335 arp->ar_pro = (dev->type != ARPHRD_AX25)? htons(ETH_P_IP) : htons(AX25_P_IP);
336 #else
337 arp->ar_pro = htons(ETH_P_IP);
338 #endif
339 arp->ar_hln = dev->addr_len;
340 arp->ar_pln = 4;
341 arp->ar_op = htons(type);
342
343 arp_ptr=(unsigned char *)(arp+1);
344
345 memcpy(arp_ptr, src_hw, dev->addr_len);
346 arp_ptr+=dev->addr_len;
347 memcpy(arp_ptr, &src_ip,4);
348 arp_ptr+=4;
349 if (dest_hw != NULL)
350 memcpy(arp_ptr, dest_hw, dev->addr_len);
351 else
352 memset(arp_ptr, 0, dev->addr_len);
353 arp_ptr+=dev->addr_len;
354 memcpy(arp_ptr, &dest_ip, 4);
355
356 dev_queue_xmit(skb, dev, 0);
357 }
358
359
360
361
362
363
364
365 static void arp_expire_request (unsigned long arg)
366 {
367 struct arp_table *entry = (struct arp_table *) arg;
368 struct arp_table **pentry;
369 unsigned long hash;
370 unsigned long flags;
371
372 save_flags(flags);
373 cli();
374
375
376
377
378
379
380
381 if (entry->flags & ATF_COM)
382 {
383 restore_flags(flags);
384 return;
385 }
386
387 if (--entry->retries > 0)
388 {
389 unsigned long ip = entry->ip;
390 struct device *dev = entry->dev;
391
392
393 del_timer(&entry->timer);
394 entry->timer.expires = ARP_RES_TIME;
395 add_timer(&entry->timer);
396 restore_flags(flags);
397 arp_send(ARPOP_REQUEST, ETH_P_ARP, ip, dev, dev->pa_addr,
398 NULL, dev->dev_addr);
399 return;
400 }
401
402
403
404
405
406
407
408
409 hash = HASH(entry->ip);
410 pentry = &arp_tables[hash];
411 while (*pentry != NULL)
412 {
413 if (*pentry == entry)
414 {
415 *pentry = entry->next;
416 del_timer(&entry->timer);
417 restore_flags(flags);
418 arp_release_entry(entry);
419 return;
420 }
421 pentry = &(*pentry)->next;
422 }
423 restore_flags(flags);
424 printk("Possible ARP queue corruption.\n");
425
426
427
428 }
429
430
431
432
433
434
435 static void arp_send_q(struct arp_table *entry, unsigned char *hw_dest)
436 {
437 struct sk_buff *skb;
438
439 unsigned long flags;
440
441
442
443
444
445 if(!(entry->flags&ATF_COM))
446 {
447 printk("arp_send_q: incomplete entry for %s\n",
448 in_ntoa(entry->ip));
449 return;
450 }
451
452 save_flags(flags);
453
454 cli();
455 while((skb = skb_dequeue(&entry->skb)) != NULL)
456 {
457 IS_SKB(skb);
458 skb_device_lock(skb);
459 restore_flags(flags);
460 if(!skb->dev->rebuild_header(skb->data,skb->dev,skb->raddr,skb))
461 {
462 skb->arp = 1;
463 if(skb->sk==NULL)
464 dev_queue_xmit(skb, skb->dev, 0);
465 else
466 dev_queue_xmit(skb,skb->dev,skb->sk->priority);
467 }
468 else
469 {
470
471
472 printk("arp_send_q: The impossible occurred. Please notify Alan.\n");
473 printk("arp_send_q: active entity %s\n",in_ntoa(entry->ip));
474 printk("arp_send_q: failed to find %s\n",in_ntoa(skb->raddr));
475 }
476 }
477 restore_flags(flags);
478 }
479
480
481
482
483
484
485 void arp_destroy(unsigned long ip_addr, int force)
486 {
487 struct arp_table *entry;
488 struct arp_table **pentry;
489 unsigned long hash = HASH(ip_addr);
490
491 cli();
492 pentry = &arp_tables[hash];
493 while ((entry = *pentry) != NULL)
494 {
495 if (entry->ip == ip_addr)
496 {
497 if ((entry->flags & ATF_PERM) && !force)
498 return;
499 *pentry = entry->next;
500 del_timer(&entry->timer);
501 sti();
502 arp_release_entry(entry);
503 return;
504 }
505 pentry = &entry->next;
506 }
507 sti();
508 }
509
510
511
512
513
514
515
516
517 int arp_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
518 {
519
520
521
522
523 struct arphdr *arp = (struct arphdr *)skb->h.raw;
524 unsigned char *arp_ptr= (unsigned char *)(arp+1);
525 struct arp_table *entry;
526 struct arp_table *proxy_entry;
527 int addr_hint,hlen,htype;
528 unsigned long hash,dest_hash;
529 unsigned char ha[MAX_ADDR_LEN];
530 long sip,tip;
531 unsigned char *sha,*tha;
532
533
534
535
536
537
538
539
540 if (arp->ar_hln != dev->addr_len ||
541 dev->type != ntohs(arp->ar_hrd) ||
542 dev->flags & IFF_NOARP ||
543 arp->ar_pln != 4)
544 {
545 kfree_skb(skb, FREE_READ);
546 return 0;
547 }
548
549
550
551
552
553
554
555 switch(dev->type)
556 {
557 #ifdef CONFIG_AX25
558 case ARPHRD_AX25:
559 if(arp->ar_pro != htons(AX25_P_IP))
560 {
561 kfree_skb(skb, FREE_READ);
562 return 0;
563 }
564 break;
565 #endif
566 case ARPHRD_ETHER:
567 if(arp->ar_pro != htons(ETH_P_IP))
568 {
569 kfree_skb(skb, FREE_READ);
570 return 0;
571 }
572 break;
573
574 default:
575 printk("ARP: dev->type mangled!\n");
576 kfree_skb(skb, FREE_READ);
577 return 0;
578 }
579
580
581
582
583
584 hlen = dev->addr_len;
585 htype = dev->type;
586
587 sha=arp_ptr;
588 arp_ptr+=hlen;
589 memcpy(&sip,arp_ptr,4);
590 arp_ptr+=4;
591 tha=arp_ptr;
592 arp_ptr+=hlen;
593 memcpy(&tip,arp_ptr,4);
594
595
596
597
598 if(tip == INADDR_LOOPBACK)
599 {
600 kfree_skb(skb, FREE_READ);
601 return 0;
602 }
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621 addr_hint = ip_chk_addr(tip);
622
623 if(arp->ar_op == htons(ARPOP_REPLY))
624 {
625 if(addr_hint!=IS_MYADDR)
626 {
627
628
629
630 kfree_skb(skb, FREE_READ);
631 return 0;
632 }
633
634
635
636 }
637 else
638 {
639
640
641
642 if(addr_hint != IS_MYADDR)
643 {
644
645
646
647
648
649 if (proxies == 0)
650 {
651 kfree_skb(skb, FREE_READ);
652 return 0;
653 }
654
655 dest_hash = HASH(tip);
656 cli();
657 for(proxy_entry=arp_tables[dest_hash];
658 proxy_entry;
659 proxy_entry = proxy_entry->next)
660 {
661 if(proxy_entry->ip == tip && proxy_entry->htype==htype)
662 break;
663 }
664 if (proxy_entry && (proxy_entry->flags & ATF_PUBL))
665 {
666 memcpy(ha, proxy_entry->ha, hlen);
667 sti();
668 arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,ha);
669 kfree_skb(skb, FREE_READ);
670 return 0;
671 }
672 else
673 {
674 sti();
675 kfree_skb(skb, FREE_READ);
676 return 0;
677 }
678 }
679 else
680 {
681
682
683
684 arp_send(ARPOP_REPLY,ETH_P_ARP,sip,dev,tip,sha,dev->dev_addr);
685 }
686 }
687
688
689
690
691
692
693
694
695 hash = HASH(sip);
696 cli();
697 for(entry=arp_tables[hash];entry;entry=entry->next)
698 if(entry->ip==sip && entry->htype==htype)
699 break;
700
701 if(entry)
702 {
703
704
705
706 memcpy(entry->ha, sha, hlen);
707 entry->hlen = hlen;
708 entry->last_used = jiffies;
709 if (!(entry->flags & ATF_COM))
710 {
711
712
713
714
715 del_timer(&entry->timer);
716 entry->flags |= ATF_COM;
717 sti();
718
719
720
721
722
723 arp_send_q(entry, sha);
724 }
725 else
726 {
727 sti();
728 }
729 }
730 else
731 {
732
733
734
735 entry = (struct arp_table *)kmalloc(sizeof(struct arp_table),GFP_ATOMIC);
736 if(entry == NULL)
737 {
738 sti();
739 printk("ARP: no memory for new arp entry\n");
740
741 kfree_skb(skb, FREE_READ);
742 return 0;
743 }
744
745 entry->ip = sip;
746 entry->hlen = hlen;
747 entry->htype = htype;
748 entry->flags = ATF_COM;
749 memcpy(entry->ha, sha, hlen);
750 entry->last_used = jiffies;
751 entry->dev = skb->dev;
752 skb_queue_head_init(&entry->skb);
753 entry->next = arp_tables[hash];
754 arp_tables[hash] = entry;
755
756 sti();
757 }
758
759
760
761
762 kfree_skb(skb, FREE_READ);
763 return 0;
764 }
765
766
767
768
769
770
771 int arp_find(unsigned char *haddr, unsigned long paddr, struct device *dev,
772 unsigned long saddr, struct sk_buff *skb)
773 {
774 struct arp_table *entry;
775 unsigned long hash;
776 switch (ip_chk_addr(paddr))
777 {
778 case IS_MYADDR:
779 printk("ARP: arp called for own IP address\n");
780 memcpy(haddr, dev->dev_addr, dev->addr_len);
781 skb->arp = 1;
782 return 0;
783 case IS_BROADCAST:
784 memcpy(haddr, dev->broadcast, dev->addr_len);
785 skb->arp = 1;
786 return 0;
787 }
788
789 hash = HASH(paddr);
790 cli();
791
792
793
794
795 for (entry = arp_tables[hash]; entry != NULL; entry = entry->next)
796 if (entry->ip == paddr)
797 break;
798
799
800 if (entry != NULL)
801 {
802 if (!(entry->flags & ATF_COM))
803 {
804
805
806
807
808
809 if (skb != NULL)
810 skb_queue_tail(&entry->skb, skb);
811 sti();
812 return 1;
813 }
814
815
816
817
818
819 entry->last_used = jiffies;
820 memcpy(haddr, entry->ha, dev->addr_len);
821 if (skb)
822 skb->arp = 1;
823 sti();
824 return 0;
825 }
826
827
828
829
830
831 entry = (struct arp_table *) kmalloc(sizeof(struct arp_table),
832 GFP_ATOMIC);
833 if (entry != NULL)
834 {
835 entry->ip = paddr;
836 entry->hlen = dev->addr_len;
837 entry->htype = dev->type;
838 entry->flags = 0;
839 memset(entry->ha, 0, dev->addr_len);
840 entry->last_used = jiffies;
841 entry->next = arp_tables[hash];
842 entry->dev = dev;
843 arp_tables[hash] = entry;
844 entry->timer.function = arp_expire_request;
845 entry->timer.data = (unsigned long)entry;
846 entry->timer.expires = ARP_RES_TIME;
847 add_timer(&entry->timer);
848 entry->retries = ARP_MAX_TRIES;
849 skb_queue_head_init(&entry->skb);
850 if (skb != NULL)
851 skb_queue_tail(&entry->skb, skb);
852 }
853 else
854 {
855 if (skb != NULL && skb->free)
856 kfree_skb(skb, FREE_WRITE);
857 }
858 sti();
859
860
861
862
863
864 arp_send(ARPOP_REQUEST, ETH_P_ARP, paddr, dev, saddr, NULL,
865 dev->dev_addr);
866
867 return 1;
868 }
869
870
871
872
873
874
875 #define HBUFFERLEN 30
876
877 int arp_get_info(char *buffer, char **start, off_t offset, int length)
878 {
879 int len=0;
880 off_t begin=0;
881 off_t pos=0;
882 int size;
883 struct arp_table *entry;
884 char hbuffer[HBUFFERLEN];
885 int i,j,k;
886 const char hexbuf[] = "0123456789ABCDEF";
887
888 size = sprintf(buffer,"IP address HW type Flags HW address\n");
889 pos+=size;
890 len+=size;
891
892 cli();
893 for(i=0; i<ARP_TABLE_SIZE; i++)
894 {
895 for(entry=arp_tables[i]; entry!=NULL; entry=entry->next)
896 {
897
898
899
900 #ifdef CONFIG_AX25
901
902 if(entry->htype==ARPHRD_AX25)
903 strcpy(hbuffer,ax2asc((ax25_address *)entry->ha));
904 else {
905 #endif
906
907 for(k=0,j=0;k<HBUFFERLEN-3 && j<entry->hlen;j++)
908 {
909 hbuffer[k++]=hexbuf[ (entry->ha[j]>>4)&15 ];
910 hbuffer[k++]=hexbuf[ entry->ha[j]&15 ];
911 hbuffer[k++]=':';
912 }
913 hbuffer[--k]=0;
914
915 #ifdef CONFIG_AX25
916 }
917 #endif
918 size = sprintf(buffer+len,
919 "%-17s0x%-10x0x%-10x%s\n",
920 in_ntoa(entry->ip),
921 (unsigned int)entry->htype,
922 entry->flags,
923 hbuffer);
924
925 len+=size;
926 pos=begin+len;
927
928 if(pos<offset)
929 {
930 len=0;
931 begin=pos;
932 }
933 if(pos>offset+length)
934 break;
935 }
936 }
937 sti();
938
939 *start=buffer+(offset-begin);
940 len-=(offset-begin);
941 if(len>length)
942 len=length;
943 return len;
944 }
945
946
947
948
949
950
951
952 static struct arp_table *arp_lookup(unsigned long paddr)
953 {
954 struct arp_table *entry;
955 unsigned long hash = HASH(paddr);
956
957 cli();
958 for (entry = arp_tables[hash]; entry != NULL; entry = entry->next)
959 if (entry->ip == paddr) break;
960 return entry;
961 }
962
963
964
965
966
967
968 static int arp_req_set(struct arpreq *req)
969 {
970 struct arpreq r;
971 struct arp_table *entry;
972 struct sockaddr_in *si;
973 int htype, hlen;
974 unsigned long ip, hash;
975 struct rtable *rt;
976
977 memcpy_fromfs(&r, req, sizeof(r));
978
979
980 if (r.arp_pa.sa_family != AF_INET)
981 return -EPFNOSUPPORT;
982
983
984
985
986
987
988
989 switch (r.arp_ha.sa_family) {
990 case ARPHRD_ETHER:
991 htype = ARPHRD_ETHER;
992 hlen = ETH_ALEN;
993 break;
994 #ifdef CONFIG_AX25
995 case ARPHRD_AX25:
996 htype = ARPHRD_AX25;
997 hlen = 7;
998 break;
999 #endif
1000 default:
1001 return -EPFNOSUPPORT;
1002 }
1003
1004 si = (struct sockaddr_in *) &r.arp_pa;
1005 ip = si->sin_addr.s_addr;
1006 if (ip == 0)
1007 {
1008 printk("ARP: SETARP: requested PA is 0.0.0.0 !\n");
1009 return -EINVAL;
1010 }
1011
1012
1013
1014
1015
1016 rt = ip_rt_route(ip, NULL, NULL);
1017 if (rt == NULL)
1018 return -ENETUNREACH;
1019
1020
1021
1022
1023
1024 hash = HASH(ip);
1025 cli();
1026
1027
1028
1029
1030 for (entry = arp_tables[hash]; entry != NULL; entry = entry->next)
1031 if (entry->ip == ip)
1032 break;
1033
1034
1035
1036
1037
1038 if (entry == NULL)
1039 {
1040 entry = (struct arp_table *) kmalloc(sizeof(struct arp_table),
1041 GFP_ATOMIC);
1042 if (entry == NULL)
1043 {
1044 sti();
1045 return -ENOMEM;
1046 }
1047 entry->ip = ip;
1048 entry->hlen = hlen;
1049 entry->htype = htype;
1050 entry->next = arp_tables[hash];
1051 arp_tables[hash] = entry;
1052 skb_queue_head_init(&entry->skb);
1053 }
1054 else
1055 if (entry->flags & ATF_PUBL)
1056 proxies--;
1057
1058
1059
1060
1061 memcpy(&entry->ha, &r.arp_ha.sa_data, hlen);
1062 entry->last_used = jiffies;
1063 entry->flags = r.arp_flags | ATF_COM;
1064 if (entry->flags & ATF_PUBL)
1065 proxies++;
1066 entry->dev = rt->rt_dev;
1067 sti();
1068
1069 return 0;
1070 }
1071
1072
1073
1074
1075
1076
1077 static int arp_req_get(struct arpreq *req)
1078 {
1079 struct arpreq r;
1080 struct arp_table *entry;
1081 struct sockaddr_in *si;
1082
1083
1084
1085
1086
1087 memcpy_fromfs(&r, req, sizeof(r));
1088
1089 if (r.arp_pa.sa_family != AF_INET)
1090 return -EPFNOSUPPORT;
1091
1092
1093
1094
1095
1096 si = (struct sockaddr_in *) &r.arp_pa;
1097 entry = arp_lookup(si->sin_addr.s_addr);
1098
1099 if (entry == NULL)
1100 {
1101 sti();
1102 return -ENXIO;
1103 }
1104
1105
1106
1107
1108
1109 memcpy(r.arp_ha.sa_data, &entry->ha, entry->hlen);
1110 r.arp_ha.sa_family = entry->htype;
1111 r.arp_flags = entry->flags;
1112 sti();
1113
1114
1115
1116
1117
1118 memcpy_tofs(req, &r, sizeof(r));
1119 return 0;
1120 }
1121
1122
1123
1124
1125
1126
1127 int arp_ioctl(unsigned int cmd, void *arg)
1128 {
1129 struct arpreq r;
1130 struct sockaddr_in *si;
1131 int err;
1132
1133 switch(cmd)
1134 {
1135 case SIOCDARP:
1136 if (!suser())
1137 return -EPERM;
1138 err = verify_area(VERIFY_READ, arg, sizeof(struct arpreq));
1139 if(err)
1140 return err;
1141 memcpy_fromfs(&r, arg, sizeof(r));
1142 if (r.arp_pa.sa_family != AF_INET)
1143 return -EPFNOSUPPORT;
1144 si = (struct sockaddr_in *) &r.arp_pa;
1145 arp_destroy(si->sin_addr.s_addr, 1);
1146 return 0;
1147 case SIOCGARP:
1148 err = verify_area(VERIFY_WRITE, arg, sizeof(struct arpreq));
1149 if(err)
1150 return err;
1151 return arp_req_get((struct arpreq *)arg);
1152 case SIOCSARP:
1153 if (!suser())
1154 return -EPERM;
1155 err = verify_area(VERIFY_READ, arg, sizeof(struct arpreq));
1156 if(err)
1157 return err;
1158 return arp_req_set((struct arpreq *)arg);
1159 default:
1160 return -EINVAL;
1161 }
1162
1163 return 0;
1164 }
1165
1166
1167
1168
1169
1170
1171 static struct packet_type arp_packet_type =
1172 {
1173 0,
1174 0,
1175 arp_rcv,
1176 NULL,
1177 NULL
1178 };
1179
1180 void arp_init (void)
1181 {
1182
1183 arp_packet_type.type=htons(ETH_P_ARP);
1184 dev_add_pack(&arp_packet_type);
1185
1186 add_timer(&arp_timer);
1187 }
1188