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1 /*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 /* Copyright (c) 1988, 1989, 1997, 1998 Apple Computer, Inc.
29 *
30 * Modified for MP, 1996 by Tuyen Nguyen
31 * Modified, March 17, 1997 by Tuyen Nguyen for MacOSX.
32 */
33
34 /* at_aarp.c: 2.0, 1.17; 10/4/93; Apple Computer, Inc. */;
35
36 /* This file is at_aarp.c and it contains all the routines used by AARP. This
37 * is part of the LAP layer.
38 */
39
40 #include <sys/errno.h>
41 #include <sys/types.h>
42 #include <sys/param.h>
43 #include <machine/spl.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
46 #include <sys/proc.h>
47 #include <sys/filedesc.h>
48 #include <sys/fcntl.h>
49 #include <sys/mbuf.h>
50 #include <sys/ioctl.h>
51 #include <sys/malloc.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54
55 #include <net/if.h>
56 #include <net/if_types.h>
57
58 #include <netat/sysglue.h>
59 #include <netat/appletalk.h>
60 #include <netat/ddp.h>
61 #include <netat/at_snmp.h>
62 #include <netat/at_pcb.h>
63 #include <netat/at_var.h>
64 #include <netat/at_aarp.h>
65 #include <netat/at_pat.h>
66 #include <netat/debug.h>
67
68 #include <sys/kern_event.h>
69
70 static int probing;
71 /* Following two variables are used to keep track of how many dynamic addresses
72 * we have tried out at startup.
73 */
74 int no_of_nodes_tried; /* no of node addresses we've tried
75 * so far, within a network number
76 */
77 int no_of_nets_tried; /* no. of network numbers tried
78 */
79
80 struct etalk_addr et_zeroaddr = {
81 {0, 0, 0, 0, 0, 0}};
82
83 aarp_amt_t probe_cb;
84 aarp_amt_array *aarp_table[IF_TOTAL_MAX];
85
86
87 StaticProc int aarp_req_cmd_in(aarp_pkt_t *, at_ifaddr_t*);
88 StaticProc int aarp_resp_cmd_in(aarp_pkt_t *, at_ifaddr_t*);
89 StaticProc int aarp_probe_cmd_in(aarp_pkt_t *, at_ifaddr_t*);
90 StaticProc int aarp_send_resp(at_ifaddr_t *, aarp_pkt_t *);
91 StaticProc int aarp_send_req(aarp_amt_t *);
92 StaticProc int aarp_send_probe(void);
93 StaticProc aarp_amt_t *aarp_lru_entry(aarp_amt_t *);
94 StaticProc int aarp_glean_info(aarp_pkt_t *, at_ifaddr_t*);
95 StaticProc int aarp_delete_amt_info(aarp_amt_t *);
96 StaticProc void aarp_build_pkt(aarp_pkt_t *, at_ifaddr_t*);
97 StaticProc void aarp_sched_req(void *);
98 StaticProc int aarp_get_rand_node(at_ifaddr_t *);
99 StaticProc int aarp_get_next_node(at_ifaddr_t *);
100 StaticProc int aarp_get_rand_net(at_ifaddr_t *);
101
102 /****************************************************************************
103 * aarp_init()
104 *
105 ****************************************************************************/
106
107 int aarp_init1(elapp)
108 register at_ifaddr_t *elapp;
109 {
110 elapp->ifThisNode.s_net = 0;
111 elapp->ifThisNode.s_node = 0;
112
113 if (probing != PROBE_TENTATIVE) /* How do I set the initial probe */
114 probing = PROBE_IDLE; /* state ???*/
115 else {
116 dPrintf(D_M_AARP,D_L_ERROR,
117 ("aarp_init: error :probing == PROBE_TENTATIVE\n"));
118 return(-1);
119 }
120
121 /* pick a random addr or start with what we have from initial_node addr */
122 if (elapp->initial_addr.s_net == 0 && elapp->initial_addr.s_node == 0) {
123 dPrintf(D_M_AARP, D_L_INFO,
124 ("aarp_init: pick up a new node number\n"));
125 aarp_get_rand_node(elapp);
126 aarp_get_rand_net(elapp);
127 }
128 probe_cb.elapp = elapp;
129 probe_cb.no_of_retries = 0;
130 probe_cb.error = 0;
131
132 no_of_nodes_tried = 0; /* haven't tried any addresses yet */
133 no_of_nets_tried = 0;
134
135 if (aarp_send_probe() == -1) {
136 probing = PROBE_IDLE; /* not probing any more */
137 dPrintf(D_M_AARP, D_L_ERROR,
138 ("aarp_init: aarp_send_probe returns error\n"));
139 return(-1);
140 }
141 return(ENOTREADY);
142 }
143
144 int aarp_init2(elapp)
145 register at_ifaddr_t *elapp;
146 {
147 if (probe_cb.error != 0) {
148 probing = PROBE_IDLE; /* not probing any more */
149 dPrintf(D_M_AARP, D_L_ERROR,
150 ("aarp_init: probe_cb.error creates error =%d\n",
151 probe_cb.error));
152 return(-1);
153 }
154
155 if (aarp_table[elapp->ifPort])
156 bzero ((caddr_t)&aarp_table[elapp->ifPort]->et_aarp_amt[0],
157 sizeof(aarp_amt_array));
158 else
159 return(-1);
160
161 elapp->ifThisNode = elapp->initial_addr;
162 probing = PROBE_DONE;
163
164 /* AppleTalk was successfully started up. Send event with node and net. */
165 atalk_post_msg(elapp->aa_ifp, KEV_ATALK_ENABLED, &(elapp->ifThisNode), 0);
166
167 /* Set global flag */
168 at_state.flags |= AT_ST_STARTED;
169
170 return(0);
171 }
172
173 /****************************************************************************
174 * aarp_rcv_pkt()
175 *
176 * remarks :
177 * (1) The caller must take care of freeing the real storage (gbuf)
178 * (2) The incoming packet is of the form {802.3, 802.2, aarp}.
179 *
180 ****************************************************************************/
181 int aarp_rcv_pkt(pkt, elapp)
182 aarp_pkt_t *pkt;
183 at_ifaddr_t *elapp;
184 {
185 switch (ntohs(pkt->aarp_cmd)) {
186 case AARP_REQ_CMD:
187 return (aarp_req_cmd_in (pkt, elapp));
188 case AARP_RESP_CMD:
189 return (aarp_resp_cmd_in (pkt, elapp));
190 case AARP_PROBE_CMD:
191 return (aarp_probe_cmd_in (pkt, elapp));
192 default:
193 return (-1);
194 }/* end of switch*/
195 }
196
197 /****************************************************************************
198 * aarp_req_cmd_in()
199 *
200 ****************************************************************************/
201 StaticProc int aarp_req_cmd_in (pkt, elapp)
202 aarp_pkt_t *pkt;
203 at_ifaddr_t *elapp;
204 {
205 /*
206 kprintf("aarp_req_cmd_in: ifThisNode=%d:%d srcNode=%d:%d dstNode=%d:%d\n",
207 elapp->ifThisNode.s_net,
208 elapp->ifThisNode.s_node,
209 NET_VALUE(pkt->src_at_addr.atalk_net),
210 pkt->src_at_addr.atalk_node,
211 NET_VALUE(pkt->dest_at_addr.atalk_net),
212 pkt->dest_at_addr.atalk_node);
213 */
214 if ((probing == PROBE_DONE) &&
215 (NET_VALUE(pkt->dest_at_addr.atalk_net) == elapp->ifThisNode.s_net) &&
216 (pkt->dest_at_addr.atalk_node == elapp->ifThisNode.s_node)) {
217 if (aarp_send_resp(elapp, pkt) == -1)
218 return(-1);
219 }
220 /* now to glean some info */
221 aarp_glean_info(pkt, elapp);
222 return (0);
223 }
224
225
226
227 /****************************************************************************
228 * aarp_resp_cmd_in()
229 *
230 ****************************************************************************/
231 StaticProc int aarp_resp_cmd_in (pkt, elapp)
232 aarp_pkt_t *pkt;
233 at_ifaddr_t *elapp;
234 {
235 register aarp_amt_t *amt_ptr;
236 gbuf_t *m;
237
238 switch (probing) {
239 case PROBE_TENTATIVE :
240 if ((NET_VALUE(pkt->src_at_addr.atalk_net) ==
241 probe_cb.elapp->initial_addr.s_net) &&
242 (pkt->src_at_addr.atalk_node ==
243 probe_cb.elapp->initial_addr.s_node)) {
244
245 /* this is a response to AARP_PROBE_CMD. There's
246 * someone out there with the address we desire
247 * for ourselves.
248 */
249 untimeout(aarp_sched_probe, 0);
250 probe_cb.no_of_retries = 0;
251 aarp_get_next_node(probe_cb.elapp);
252 no_of_nodes_tried++;
253
254 if (no_of_nodes_tried == AARP_MAX_NODES_TRIED) {
255 aarp_get_rand_net(probe_cb.elapp);
256 aarp_get_rand_node(probe_cb.elapp);
257 no_of_nodes_tried = 0;
258 no_of_nets_tried++;
259 }
260 if (no_of_nets_tried == AARP_MAX_NETS_TRIED) {
261 /* We have tried enough nodes and nets, give up.
262 */
263 probe_cb.error = EADDRNOTAVAIL;
264 AARPwakeup(&probe_cb);
265 return(0);
266 }
267 if (aarp_send_probe() == -1) {
268 /* expecting aarp_send_probe to fill in
269 * probe_cb.error
270 */
271 AARPwakeup(&probe_cb);
272 return(-1);
273 }
274 } else {
275 /* hmmmm! got a response packet while still probing
276 * for AT address and the AT dest address doesn't
277 * match!!
278 * What should I do here?? kkkkkkkkk
279 */
280 return(-1);
281 }
282 break;
283
284 case PROBE_DONE :
285 AMT_LOOK(amt_ptr, pkt->src_at_addr, elapp)
286 if (amt_ptr == NULL)
287 return(-1);
288 if (amt_ptr->tmo) {
289 untimeout(aarp_sched_req, amt_ptr);
290 amt_ptr->tmo = 0;
291 }
292
293 if (amt_ptr->m == NULL) {
294 /* this may be because of a belated response to
295 * aarp reaquest. Based on an earlier response, we
296 * might have already sent the packet out, so
297 * there's nothing to send now. This is okay, no
298 * error.
299 */
300 return(0);
301 }
302 amt_ptr->dest_addr = pkt->src_addr;
303 if (FDDI_OR_TOKENRING(elapp->aa_ifp->if_type))
304 ddp_bit_reverse((unsigned char *)&amt_ptr->dest_addr);
305 m = amt_ptr->m;
306 amt_ptr->m = NULL;
307 pat_output(amt_ptr->elapp, m,
308 (unsigned char *)&amt_ptr->dest_addr, 0);
309 break;
310 default :
311 /* probing in a weird state?? */
312 return(-1);
313 }
314 return(0);
315 }
316
317
318
319 /****************************************************************************
320 * aarp_probe_cmd_in()
321 *
322 ****************************************************************************/
323 StaticProc int aarp_probe_cmd_in (pkt, elapp)
324 register aarp_pkt_t *pkt;
325 at_ifaddr_t *elapp;
326 {
327 register aarp_amt_t *amt_ptr;
328
329 switch (probing) {
330 case PROBE_TENTATIVE :
331 if ((elapp == probe_cb.elapp) &&
332 (NET_VALUE(pkt->src_at_addr.atalk_net) ==
333 probe_cb.elapp->initial_addr.s_net) &&
334 (pkt->src_at_addr.atalk_node ==
335 probe_cb.elapp->initial_addr.s_node)) {
336 /* some bozo is probing for address I want... and I
337 * can't tell him to shove off!
338 */
339 untimeout(aarp_sched_probe, 0);
340 probe_cb.no_of_retries = 0;
341 aarp_get_next_node(probe_cb.elapp);
342 no_of_nodes_tried++;
343
344 if (no_of_nodes_tried == AARP_MAX_NODES_TRIED) {
345 aarp_get_rand_net(probe_cb.elapp);
346 aarp_get_rand_node(probe_cb.elapp);
347 no_of_nodes_tried = 0;
348 no_of_nets_tried++;
349 }
350 if (no_of_nets_tried == AARP_MAX_NETS_TRIED) {
351 /* We have tried enough nodes and nets, give up.
352 */
353 probe_cb.error = EADDRNOTAVAIL;
354 AARPwakeup(&probe_cb);
355 return(0);
356 }
357 if (aarp_send_probe() == -1) {
358 /* expecting aarp_send_probe to fill in
359 * probe_cb.error
360 */
361 AARPwakeup(&probe_cb);
362 return(-1);
363 }
364 } else {
365 /* somebody's probing... none of my business yet, so
366 * just ignore the packet
367 */
368 return (0);
369 }
370 break;
371
372 case PROBE_DONE :
373 if ((NET_VALUE(pkt->src_at_addr.atalk_net) == elapp->ifThisNode.s_net) &&
374 (pkt->src_at_addr.atalk_node == elapp->ifThisNode.s_node)) {
375 if (aarp_send_resp(elapp, pkt) == -1)
376 return (-1);
377 return (0);
378 }
379 AMT_LOOK(amt_ptr, pkt->src_at_addr, elapp);
380
381 if (amt_ptr)
382 aarp_delete_amt_info(amt_ptr);
383 break;
384 default :
385 /* probing in a weird state?? */
386 return (-1);
387 }
388 return (0);
389 }
390
391
392
393 /****************************************************************************
394 * aarp_chk_addr()
395 ****************************************************************************/
396 int aarp_chk_addr(ddp_hdrp, elapp)
397 at_ddp_t *ddp_hdrp;
398 at_ifaddr_t *elapp;
399 {
400 if ((ddp_hdrp->dst_node == elapp->ifThisNode.s_node) &&
401 (NET_VALUE(ddp_hdrp->dst_net) == elapp->ifThisNode.s_net)) {
402 return(0); /* exact match in address */
403 }
404
405 if (AARP_BROADCAST(ddp_hdrp, elapp)) {
406 return(0); /* some kind of broadcast address */
407 }
408 return (AARP_ERR_NOT_OURS); /* not for us */
409 }
410
411
412
413 /****************************************************************************
414 * aarp_send_data()
415 *
416 * remarks :
417 * 1. The message coming in would be of the form {802.3, 802.2, ddp,...}
418 *
419 * 2. The message coming in would be freed here if transmission goes
420 * through okay. If an error is returned by aarp_send_data, the caller
421 * can assume that the message is not freed. The exception to
422 * this scenario is the prepended atalk_addr field. This field
423 * will ALWAYS be removed. If the message is dropped,
424 * it's not an "error".
425 *
426 * Parameter dest_at_addr must have the net # in network byte order
427 ****************************************************************************/
428
429 int aarp_send_data(m, elapp, dest_at_addr, loop)
430 register gbuf_t *m;
431 register at_ifaddr_t *elapp;
432 struct atalk_addr *dest_at_addr; /* net# in network byte order */
433 int loop; /* if true, loopback broadcasts */
434 {
435 register aarp_amt_t *amt_ptr;
436 register at_ddp_t *ddp_hdrp;
437 int error;
438 struct timeval timenow;
439 getmicrouptime(&timenow);
440
441 if (gbuf_len(m) <= 0)
442 ddp_hdrp = (at_ddp_t *)gbuf_rptr(gbuf_cont(m));
443 else
444 ddp_hdrp = (at_ddp_t *)gbuf_rptr(m);
445
446 if ((ddp_hdrp->dst_node == ddp_hdrp->src_node) &&
447 (NET_VALUE(ddp_hdrp->dst_net) == NET_VALUE(ddp_hdrp->src_net))) {
448 /*
449 * we're sending to ourselves
450 * so loop it back upstream
451 */
452 ddp_input(m, elapp);
453 return(0);
454 }
455 AMT_LOOK(amt_ptr, *dest_at_addr, elapp);
456
457
458 if (amt_ptr) {
459 if (amt_ptr->m) {
460 /*
461 * there's already a packet awaiting transmission, so
462 * drop this one and let the upper layer retransmit
463 * later.
464 */
465 gbuf_freel(m);
466 return (0);
467 }
468 return (pat_output(elapp, m,
469 (unsigned char *)&amt_ptr->dest_addr, 0));
470 }
471 /*
472 * either this is a packet to be broadcasted, or the address
473 * resolution needs to be done
474 */
475 if (AARP_BROADCAST(ddp_hdrp, elapp)) {
476 gbuf_t *newm = 0;
477 struct etalk_addr *dest_addr;
478
479 dest_addr = &elapp->cable_multicast_addr;
480 if (loop)
481 newm = (gbuf_t *)gbuf_dupm(m);
482
483 if ( !(error = pat_output(elapp, m,
484 (unsigned char *)dest_addr, 0))) {
485 /*
486 * The message transmitted successfully;
487 * Also loop a copy back up since this
488 * is a broadcast message.
489 */
490 if (loop) {
491 if (newm == NULL)
492 return (error);
493 ddp_input(newm, elapp);
494 } /* endif loop */
495 } else {
496 if (newm)
497 gbuf_freem(newm);
498 }
499 return (error);
500 }
501 NEW_AMT(amt_ptr, *dest_at_addr, elapp)
502
503 if (amt_ptr->m) {
504 /*
505 * no non-busy slots available in the cache, so
506 * drop this one and let the upper layer retransmit
507 * later.
508 */
509 gbuf_freel(m);
510 return (0);
511 }
512 amt_ptr->dest_at_addr = *dest_at_addr;
513 amt_ptr->dest_at_addr.atalk_unused = 0;
514
515 getmicrouptime(&timenow);
516 amt_ptr->last_time = timenow.tv_sec;
517 amt_ptr->m = m;
518 amt_ptr->elapp = elapp;
519 amt_ptr->no_of_retries = 0;
520
521 if ((error = aarp_send_req(amt_ptr))) {
522 aarp_delete_amt_info(amt_ptr);
523 return(error);
524 }
525 return(0);
526 }
527
528
529
530 /****************************************************************************
531 * aarp_send_resp()
532 *
533 * remarks :
534 * The pkt being passed here is only to "look at". It should neither
535 * be used for transmission, nor freed. Its contents also must not be
536 * altered.
537 *
538 ****************************************************************************/
539 StaticProc int aarp_send_resp(elapp, pkt)
540 register at_ifaddr_t *elapp;
541 aarp_pkt_t *pkt;
542 {
543 register aarp_pkt_t *new_pkt;
544 register gbuf_t *m;
545
546 if ((m = gbuf_alloc(AT_WR_OFFSET+sizeof(aarp_pkt_t), PRI_MED)) == NULL) {
547 return (-1);
548 }
549 gbuf_rinc(m,AT_WR_OFFSET);
550 gbuf_wset(m,0);
551
552 new_pkt = (aarp_pkt_t *)gbuf_rptr(m);
553 aarp_build_pkt(new_pkt, elapp);
554
555 new_pkt->aarp_cmd = htons(AARP_RESP_CMD);
556 new_pkt->dest_addr = pkt->src_addr;
557
558 new_pkt->dest_at_addr = pkt->src_at_addr;
559 new_pkt->dest_at_addr.atalk_unused = 0;
560
561 ATALK_ASSIGN(new_pkt->src_at_addr, elapp->ifThisNode.s_net,
562 elapp->ifThisNode.s_node, 0);
563
564 gbuf_winc(m,sizeof(aarp_pkt_t));
565 if (FDDI_OR_TOKENRING(elapp->aa_ifp->if_type))
566 ddp_bit_reverse((unsigned char *)&new_pkt->dest_addr);
567
568 if (pat_output(elapp, m, (unsigned char *)&new_pkt->dest_addr,
569 AARP_AT_TYPE))
570 return(-1);
571 return(0);
572 }
573
574
575
576 /****************************************************************************
577 * aarp_send_req()
578 *
579 ****************************************************************************/
580
581 StaticProc int aarp_send_req (amt_ptr)
582 register aarp_amt_t *amt_ptr;
583 {
584 register aarp_pkt_t *pkt;
585 register gbuf_t *m;
586 int error;
587
588 if ((m = gbuf_alloc(AT_WR_OFFSET+sizeof(aarp_pkt_t), PRI_MED)) == NULL) {
589 return (ENOBUFS);
590 }
591 gbuf_rinc(m,AT_WR_OFFSET);
592 gbuf_wset(m,0);
593
594 pkt = (aarp_pkt_t *)gbuf_rptr(m);
595 aarp_build_pkt(pkt, amt_ptr->elapp);
596
597 pkt->aarp_cmd = htons(AARP_REQ_CMD);
598 pkt->dest_addr = et_zeroaddr;
599 pkt->dest_at_addr = amt_ptr->dest_at_addr;
600 pkt->dest_at_addr.atalk_unused = 0;
601 ATALK_ASSIGN(pkt->src_at_addr, amt_ptr->elapp->ifThisNode.s_net,
602 amt_ptr->elapp->ifThisNode.s_node, 0);
603 gbuf_winc(m,sizeof(aarp_pkt_t));
604
605 amt_ptr->no_of_retries++;
606 timeout(aarp_sched_req, amt_ptr, AARP_REQ_TIMER_INT);
607 amt_ptr->tmo = 1;
608 error = pat_output(amt_ptr->elapp, m,
609 (unsigned char *)&amt_ptr->elapp->cable_multicast_addr, AARP_AT_TYPE);
610 if (error)
611 {
612 untimeout(aarp_sched_req, amt_ptr);
613 amt_ptr->tmo = 0;
614 return(error);
615 }
616
617 return(0);
618 }
619
620
621
622 /****************************************************************************
623 * aarp_send_probe()
624 *
625 ****************************************************************************/
626 StaticProc int aarp_send_probe(void)
627 {
628 register aarp_pkt_t *pkt;
629 register gbuf_t *m;
630
631 if ((m = gbuf_alloc(AT_WR_OFFSET+sizeof(aarp_pkt_t), PRI_MED)) == NULL) {
632 probe_cb.error = ENOBUFS;
633 return (-1);
634 }
635 gbuf_rinc(m,AT_WR_OFFSET);
636 gbuf_wset(m,0);
637 pkt = (aarp_pkt_t *)gbuf_rptr(m);
638 aarp_build_pkt(pkt, probe_cb.elapp);
639
640 pkt->aarp_cmd = htons(AARP_PROBE_CMD);
641 pkt->dest_addr = et_zeroaddr;
642
643 ATALK_ASSIGN(pkt->src_at_addr, probe_cb.elapp->initial_addr.s_net,
644 probe_cb.elapp->initial_addr.s_node, 0);
645
646 ATALK_ASSIGN(pkt->dest_at_addr, probe_cb.elapp->initial_addr.s_net,
647 probe_cb.elapp->initial_addr.s_node, 0);
648
649 gbuf_winc(m,sizeof(aarp_pkt_t));
650
651 probe_cb.error = pat_output(probe_cb.elapp, m,
652 (unsigned char *)&probe_cb.elapp->cable_multicast_addr, AARP_AT_TYPE);
653 if (probe_cb.error) {
654 return(-1);
655 }
656
657 probing = PROBE_TENTATIVE;
658 probe_cb.no_of_retries++;
659 timeout(aarp_sched_probe, 0, AARP_PROBE_TIMER_INT);
660
661 return(0);
662 }
663
664
665
666 /****************************************************************************
667 * aarp_lru_entry()
668 *
669 ****************************************************************************/
670
671 StaticProc aarp_amt_t *aarp_lru_entry(at)
672 register aarp_amt_t *at;
673 {
674 register aarp_amt_t *at_ret;
675 register int i;
676
677 at_ret = at;
678
679 for (i = 1, at++; i < AMT_BSIZ; i++, at++) {
680 if (at->last_time < at_ret->last_time && (at->m == NULL))
681 at_ret = at;
682 }
683 return(at_ret);
684 }
685
686
687
688 /****************************************************************************
689 * aarp_glean_info()
690 *
691 ****************************************************************************/
692
693 StaticProc int aarp_glean_info(pkt, elapp)
694 register aarp_pkt_t *pkt;
695 at_ifaddr_t *elapp;
696 {
697 register aarp_amt_t *amt_ptr;
698
699 AMT_LOOK(amt_ptr, pkt->src_at_addr, elapp);
700
701 if (amt_ptr == NULL) {
702 /*
703 * amt entry for this address doesn't exist, add it to the cache
704 */
705 NEW_AMT(amt_ptr, pkt->src_at_addr,elapp);
706
707 if (amt_ptr->m)
708 return(0); /* no non-busy slots available in the cache */
709 amt_ptr->dest_at_addr = pkt->src_at_addr;
710 amt_ptr->dest_at_addr.atalk_unused = 0;
711
712 amt_ptr->last_time = (int)random();
713 }
714 /*
715 * update the ethernet address
716 * in either case
717 */
718 amt_ptr->dest_addr = pkt->src_addr;
719 if (FDDI_OR_TOKENRING(elapp->aa_ifp->if_type))
720 ddp_bit_reverse((unsigned char *)&amt_ptr->dest_addr);
721 return(1);
722 }
723
724
725 /****************************************************************************
726 * aarp_delete_amt_info()
727 *
728 ****************************************************************************/
729
730 StaticProc int aarp_delete_amt_info(amt_ptr)
731 register aarp_amt_t *amt_ptr;
732 {
733 register gbuf_t *m;
734 amt_ptr->last_time = 0;
735 ATALK_ASSIGN(amt_ptr->dest_at_addr, 0, 0, 0);
736 amt_ptr->no_of_retries = 0;
737
738 if (amt_ptr->m) {
739 m = amt_ptr->m;
740 amt_ptr->m = NULL;
741 gbuf_freel(m);
742 }
743 return(0);
744 }
745
746
747
748 /****************************************************************************
749 * aarp_sched_probe()
750 *
751 ****************************************************************************/
752
753 void aarp_sched_probe(__unused void *arg)
754 {
755
756 atalk_lock();
757
758 if (probe_cb.elapp->aa_ifp != 0 &&
759 probe_cb.no_of_retries != AARP_MAX_PROBE_RETRIES) {
760 if (aarp_send_probe() == -1)
761 AARPwakeup(&probe_cb);
762 } else {
763 probe_cb.error = 0;
764 AARPwakeup(&probe_cb);
765 }
766
767 atalk_unlock();
768 }
769
770
771
772 /****************************************************************************
773 * aarp_build_pkt()
774 *
775 ****************************************************************************/
776
777 StaticProc void aarp_build_pkt(pkt, elapp)
778 register aarp_pkt_t *pkt;
779 at_ifaddr_t *elapp;
780 {
781 pkt->hardware_type = htons(AARP_ETHER_HW_TYPE);
782 pkt->stack_type = htons(AARP_AT_PROTO);
783 pkt->hw_addr_len = ETHERNET_ADDR_LEN;
784 pkt->stack_addr_len = AARP_AT_ADDR_LEN;
785 bcopy(elapp->xaddr, pkt->src_addr.etalk_addr_octet, sizeof(elapp->xaddr));
786 if (FDDI_OR_TOKENRING(elapp->aa_ifp->if_type))
787 ddp_bit_reverse(pkt->src_addr.etalk_addr_octet);
788 }
789
790 /****************************************************************************
791 * aarp_sched_req()
792 *
793 ****************************************************************************/
794
795 StaticProc void aarp_sched_req(arg)
796 void *arg;
797 {
798 int i;
799 aarp_amt_t *amt_ptr = (aarp_amt_t *)arg;
800
801 atalk_lock();
802
803 /*
804 * make sure pointer still valid in case interface removed
805 * while trying to acquire the funnel. make sure it points
806 * into one of the amt arrays.
807 */
808 for (i = 0; i < IF_TOTAL_MAX; i++) {
809 if (aarp_table[i] == NULL || (void *)amt_ptr < (void *)aarp_table[i] ||
810 (void *)amt_ptr >= (void *)(aarp_table[i] + 1))
811 continue; /* no match - try next entry */
812
813 /*
814 * found match - pointer is valid
815 */
816 if (amt_ptr->tmo == 0) {
817 atalk_unlock();
818 return;
819 }
820 if (amt_ptr->no_of_retries < AARP_MAX_REQ_RETRIES) {
821 if (aarp_send_req(amt_ptr) == 0) {
822 atalk_unlock();
823 return;
824 }
825 }
826 aarp_delete_amt_info(amt_ptr);
827 break;
828 }
829 atalk_unlock();
830
831 return;
832 }
833
834
835
836 /****************************************************************************
837 * aarp_get_rand_node()
838 *
839 ****************************************************************************/
840 StaticProc int aarp_get_rand_node(elapp)
841 at_ifaddr_t *elapp;
842 {
843 register u_char node;
844
845 /*
846 * generate a starting node number in the range 1 thru 0xfd.
847 * we use this as the starting probe point for a given net
848 * To generate a different node number each time we call
849 * aarp_get_next_node
850 */
851 node = ((u_char)(random() & 0xff)) % 0xfd + 2;
852
853 elapp->initial_addr.s_node = node;
854 return(0);
855 }
856
857
858
859 StaticProc int aarp_get_next_node(elapp)
860 at_ifaddr_t *elapp;
861 {
862 register u_char node = elapp->initial_addr.s_node;
863
864 /*
865 * return the next node number in the range 1 thru 0xfd.
866 */
867 node = (node == 0xfd) ? (1) : (node+1);
868
869 elapp->initial_addr.s_node = node;
870 return(0);
871 }
872
873
874
875
876
877 /****************************************************************************
878 * aarp_get_rand_net()
879 *
880 ****************************************************************************/
881 StaticProc int aarp_get_rand_net(elapp)
882 register at_ifaddr_t *elapp;
883 {
884 register at_net_al last_net, new_net;
885
886 if (elapp->ifThisCableStart) {
887 last_net = elapp->initial_addr.s_net;
888 /*
889 * the range of network numbers valid for this
890 * cable is known. Try to choose a number from
891 * this range only.
892 */
893 new_net= ((at_net_al)random() & 0xffff);
894 /* two-byte random number generated... now fit it in
895 * the prescribed range
896 */
897 new_net = new_net % (unsigned) (elapp->ifThisCableEnd -
898 elapp->ifThisCableStart + 1)
899 + elapp->ifThisCableStart;
900
901 if (new_net == last_net) {
902 if (new_net == elapp->ifThisCableEnd)
903 new_net = elapp->ifThisCableStart;
904 else
905 new_net++;
906 }
907 elapp->initial_addr.s_net = new_net;
908 } else {
909 /* The range of valid network numbers for this cable
910 * is not known... choose a network number from
911 * startup range.
912 */
913 last_net = (elapp->initial_addr.s_net & 0x00ff);
914 new_net = (at_net_al)random() & 0x00ff;
915
916 if (new_net == last_net)
917 new_net++;
918 if (new_net == 0xff)
919 new_net = 0;
920 elapp->initial_addr.s_net = (DDP_STARTUP_LOW | new_net);
921 }
922 return(0);
923 }
924
925
926 int getAarpTableSize(__unused int elapId)
927 /* elap_specifics array index (should be
928 * changed when we add a non-ethernet type
929 * of I/F to the mix. Unused for now.
930 */
931 {
932 return(AMTSIZE);
933 }
934
935 int getPhysAddrSize(__unused int elapId)
936 /* elap_specifics array index (should be
937 * changed when we add a non-ethernet type
938 * of I/F to the mix. Unused for now.
939 */
940 {
941 return(ETHERNET_ADDR_LEN);
942 }
943
944 #define ENTRY_SIZE sizeof(struct atalk_addr) + sizeof(struct etalk_addr)
945
946 snmpAarpEnt_t *getAarp(elapId)
947 int *elapId; /* I/F table to retrieve & table
948 size entries on return */
949
950 /* gets aarp table for specified interface and builds
951 a table in SNMP expected format. Returns pointer to said
952 table and sets elapId to byte size of used portion of table
953 */
954 {
955 int i, cnt=0;
956 aarp_amt_t *amtp;
957 static snmpAarpEnt_t snmp[AMTSIZE];
958 snmpAarpEnt_t *snmpp;
959 struct atalk_addr addr;
960 u_short tmp_net;
961
962
963 if (*elapId <0 || *elapId >= IF_TOTAL_MAX)
964 return NULL;
965
966
967 for (i=0, amtp = &(aarp_table[*elapId]->et_aarp_amt[0]), snmpp = snmp;
968 i < AMTSIZE; i++,amtp++) {
969
970 /* last_time will be 0 if entry was never used */
971 if (amtp->last_time) {
972 /* copy just network & mac address.
973 * For speed, we assume that the atalk_addr
974 * & etalk_addr positions in the aarp_amt_t struct
975 * has not changed and copy both at once
976 */
977 addr.atalk_unused = 0;
978 tmp_net = UAS_VALUE(amtp->dest_at_addr.atalk_net);
979 NET_ASSIGN(addr.atalk_net, tmp_net);
980 addr.atalk_node = amtp->dest_at_addr.atalk_node;
981 bcopy(&addr, &snmpp->ap_ddpAddr, ENTRY_SIZE);
982 snmpp++;
983 cnt++;
984
985 }
986 }
987 *elapId = cnt;
988 return(snmp);
989 }
990 /*#endif *//* COMMENTED_OUT */
991
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