1 /*
2 * Copyright (c) 1990,1991 Regents of The University of Michigan.
3 * All Rights Reserved.
4 *
5 * $FreeBSD: releng/5.3/sys/netatalk/at_control.c 136588 2004-10-16 08:43:07Z cvs2svn $
6 */
7
8 #include <sys/param.h>
9 #include <sys/systm.h>
10 #include <sys/sockio.h>
11 #include <sys/malloc.h>
12 #include <sys/kernel.h>
13 #include <sys/socket.h>
14 #include <net/if.h>
15 #include <net/route.h>
16 #include <netinet/in.h>
17 #undef s_net
18 #include <netinet/if_ether.h>
19
20 #include <netatalk/at.h>
21 #include <netatalk/at_var.h>
22 #include <netatalk/at_extern.h>
23
24 struct at_ifaddr *at_ifaddr_list;
25
26 static int aa_dorangeroute(struct ifaddr *ifa, u_int first, u_int last,
27 int cmd);
28 static int aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
29 struct at_addr *mask);
30 static int aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
31 struct at_addr *mask);
32 static int aa_dosingleroute(struct ifaddr *ifa, struct at_addr *addr,
33 struct at_addr *mask, int cmd, int flags);
34 static int at_scrub(struct ifnet *ifp, struct at_ifaddr *aa);
35 static int at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa,
36 struct sockaddr_at *sat);
37 static int aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw);
38
39 #define sateqaddr(a,b) \
40 ((a)->sat_len == (b)->sat_len && \
41 (a)->sat_family == (b)->sat_family && \
42 (a)->sat_addr.s_net == (b)->sat_addr.s_net && \
43 (a)->sat_addr.s_node == (b)->sat_addr.s_node)
44
45 int
46 at_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
47 struct thread *td)
48 {
49 struct ifreq *ifr = (struct ifreq *)data;
50 struct sockaddr_at *sat;
51 struct netrange *nr;
52 struct at_aliasreq *ifra = (struct at_aliasreq *)data;
53 struct at_ifaddr *aa0;
54 struct at_ifaddr *aa = NULL;
55 struct ifaddr *ifa, *ifa0;
56
57 /*
58 * If we have an ifp, then find the matching at_ifaddr if it exists
59 */
60 if (ifp != NULL) {
61 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
62 if (aa->aa_ifp == ifp)
63 break;
64 }
65 }
66
67 /*
68 * In this first switch table we are basically getting ready for
69 * the second one, by getting the atalk-specific things set up
70 * so that they start to look more similar to other protocols etc.
71 */
72
73 switch (cmd) {
74 case SIOCAIFADDR:
75 case SIOCDIFADDR:
76 /*
77 * If we have an appletalk sockaddr, scan forward of where we
78 * are now on the at_ifaddr list to find one with a matching
79 * address on this interface. This may leave aa pointing to
80 * the first address on the NEXT interface!
81 */
82 if (ifra->ifra_addr.sat_family == AF_APPLETALK) {
83 for (; aa; aa = aa->aa_next) {
84 if (aa->aa_ifp == ifp &&
85 sateqaddr(&aa->aa_addr, &ifra->ifra_addr))
86 break;
87 }
88 }
89 /*
90 * If we a retrying to delete an addres but didn't find such,
91 * then rewurn with an error
92 */
93 if (cmd == SIOCDIFADDR && aa == NULL)
94 return (EADDRNOTAVAIL);
95 /*FALLTHROUGH*/
96
97 case SIOCSIFADDR:
98 /*
99 * If we are not superuser, then we don't get to do these ops.
100 */
101 if (suser(td))
102 return (EPERM);
103
104 sat = satosat(&ifr->ifr_addr);
105 nr = (struct netrange *)sat->sat_zero;
106 if (nr->nr_phase == 1) {
107 /*
108 * Look for a phase 1 address on this interface.
109 * This may leave aa pointing to the first address on
110 * the NEXT interface!
111 */
112 for (; aa; aa = aa->aa_next) {
113 if (aa->aa_ifp == ifp &&
114 (aa->aa_flags & AFA_PHASE2) == 0)
115 break;
116 }
117 } else { /* default to phase 2 */
118 /*
119 * Look for a phase 2 address on this interface.
120 * This may leave aa pointing to the first address on
121 * the NEXT interface!
122 */
123 for (; aa; aa = aa->aa_next) {
124 if (aa->aa_ifp == ifp && (aa->aa_flags &
125 AFA_PHASE2))
126 break;
127 }
128 }
129
130 if (ifp == NULL)
131 panic("at_control");
132
133 /*
134 * If we failed to find an existing at_ifaddr entry, then we
135 * allocate a fresh one.
136 */
137 if (aa == NULL) {
138 aa0 = malloc(sizeof(struct at_ifaddr), M_IFADDR,
139 M_WAITOK | M_ZERO);
140 if ((aa = at_ifaddr_list) != NULL) {
141 /*
142 * Don't let the loopback be first, since the
143 * first address is the machine's default
144 * address for binding. If it is, stick
145 * ourself in front, otherwise go to the back
146 * of the list.
147 */
148 if (at_ifaddr_list->aa_ifp->if_flags &
149 IFF_LOOPBACK) {
150 aa = aa0;
151 aa->aa_next = at_ifaddr_list;
152 at_ifaddr_list = aa;
153 } else {
154 for (; aa->aa_next; aa = aa->aa_next)
155 ;
156 aa->aa_next = aa0;
157 }
158 } else
159 at_ifaddr_list = aa0;
160 aa = aa0;
161
162 /*
163 * Find the end of the interface's addresses
164 * and link our new one on the end
165 */
166 ifa = (struct ifaddr *)aa;
167 IFA_LOCK_INIT(ifa);
168 ifa->ifa_refcnt = 1;
169 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
170
171 /*
172 * As the at_ifaddr contains the actual sockaddrs,
173 * and the ifaddr itself, link them al together
174 * correctly.
175 */
176 ifa->ifa_addr = (struct sockaddr *)&aa->aa_addr;
177 ifa->ifa_dstaddr = (struct sockaddr *)&aa->aa_addr;
178 ifa->ifa_netmask = (struct sockaddr *)&aa->aa_netmask;
179
180 /*
181 * Set/clear the phase 2 bit.
182 */
183 if (nr->nr_phase == 1)
184 aa->aa_flags &= ~AFA_PHASE2;
185 else
186 aa->aa_flags |= AFA_PHASE2;
187
188 /*
189 * and link it all together
190 */
191 aa->aa_ifp = ifp;
192 } else {
193 /*
194 * If we DID find one then we clobber any routes
195 * dependent on it..
196 */
197 at_scrub(ifp, aa);
198 }
199 break;
200
201 case SIOCGIFADDR :
202 sat = satosat(&ifr->ifr_addr);
203 nr = (struct netrange *)sat->sat_zero;
204 if (nr->nr_phase == 1) {
205 /*
206 * If the request is specifying phase 1, then
207 * only look at a phase one address
208 */
209 for (; aa; aa = aa->aa_next) {
210 if (aa->aa_ifp == ifp &&
211 (aa->aa_flags & AFA_PHASE2) == 0)
212 break;
213 }
214 } else {
215 /*
216 * default to phase 2
217 */
218 for (; aa; aa = aa->aa_next) {
219 if (aa->aa_ifp == ifp && (aa->aa_flags &
220 AFA_PHASE2))
221 break;
222 }
223 }
224
225 if (aa == NULL)
226 return (EADDRNOTAVAIL);
227 break;
228 }
229
230 /*
231 * By the time this switch is run we should be able to assume that
232 * the "aa" pointer is valid when needed.
233 */
234 switch (cmd) {
235 case SIOCGIFADDR:
236
237 /*
238 * copy the contents of the sockaddr blindly.
239 */
240 sat = (struct sockaddr_at *)&ifr->ifr_addr;
241 *sat = aa->aa_addr;
242
243 /*
244 * and do some cleanups
245 */
246 ((struct netrange *)&sat->sat_zero)->nr_phase
247 = (aa->aa_flags & AFA_PHASE2) ? 2 : 1;
248 ((struct netrange *)&sat->sat_zero)->nr_firstnet =
249 aa->aa_firstnet;
250 ((struct netrange *)&sat->sat_zero)->nr_lastnet =
251 aa->aa_lastnet;
252 break;
253
254 case SIOCSIFADDR:
255 return (at_ifinit(ifp, aa,
256 (struct sockaddr_at *)&ifr->ifr_addr));
257
258 case SIOCAIFADDR:
259 if (sateqaddr(&ifra->ifra_addr, &aa->aa_addr))
260 return (0);
261 return (at_ifinit(ifp, aa,
262 (struct sockaddr_at *)&ifr->ifr_addr));
263
264 case SIOCDIFADDR:
265 /*
266 * scrub all routes.. didn't we just DO this? XXX yes, del it
267 */
268 at_scrub(ifp, aa);
269
270 /*
271 * remove the ifaddr from the interface
272 */
273 ifa0 = (struct ifaddr *)aa;
274 TAILQ_REMOVE(&ifp->if_addrhead, ifa0, ifa_link);
275
276 /*
277 * Now remove the at_ifaddr from the parallel structure
278 * as well, or we'd be in deep trouble
279 */
280 aa0 = aa;
281 if (aa0 == (aa = at_ifaddr_list)) {
282 at_ifaddr_list = aa->aa_next;
283 } else {
284 while (aa->aa_next && (aa->aa_next != aa0))
285 aa = aa->aa_next;
286
287 /*
288 * if we found it, remove it, otherwise we screwed up.
289 */
290 if (aa->aa_next)
291 aa->aa_next = aa0->aa_next;
292 else
293 panic("at_control");
294 }
295
296 /*
297 * Now reclaim the reference.
298 */
299 IFAFREE(ifa0);
300 break;
301
302 default:
303 if (ifp == NULL || ifp->if_ioctl == NULL)
304 return (EOPNOTSUPP);
305 return ((*ifp->if_ioctl)(ifp, cmd, data));
306 }
307 return (0);
308 }
309
310 /*
311 * Given an interface and an at_ifaddr (supposedly on that interface)
312 * remove any routes that depend on this.
313 * Why ifp is needed I'm not sure,
314 * as aa->at_ifaddr.ifa_ifp should be the same.
315 */
316 static int
317 at_scrub(struct ifnet *ifp, struct at_ifaddr *aa)
318 {
319 int error;
320
321 if (aa->aa_flags & AFA_ROUTE) {
322 if (ifp->if_flags & IFF_LOOPBACK) {
323 if ((error = aa_delsingleroute(&aa->aa_ifa,
324 &aa->aa_addr.sat_addr, &aa->aa_netmask.sat_addr))
325 != 0)
326 return (error);
327 } else if (ifp->if_flags & IFF_POINTOPOINT) {
328 if ((error = rtinit(&aa->aa_ifa, RTM_DELETE,
329 RTF_HOST)) != 0)
330 return (error);
331 } else if (ifp->if_flags & IFF_BROADCAST) {
332 error = aa_dorangeroute(&aa->aa_ifa,
333 ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
334 RTM_DELETE);
335 }
336 aa->aa_ifa.ifa_flags &= ~IFA_ROUTE;
337 aa->aa_flags &= ~AFA_ROUTE;
338 }
339 return (0);
340 }
341
342 /*
343 * given an at_ifaddr,a sockaddr_at and an ifp,
344 * bang them all together at high speed and see what happens
345 */
346 static int
347 at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, struct sockaddr_at *sat)
348 {
349 struct netrange nr, onr;
350 struct sockaddr_at oldaddr;
351 int error = 0, i, j;
352 int netinc, nodeinc, nnets;
353 u_short net;
354
355 /*
356 * save the old addresses in the at_ifaddr just in case we need them.
357 */
358 oldaddr = aa->aa_addr;
359 onr.nr_firstnet = aa->aa_firstnet;
360 onr.nr_lastnet = aa->aa_lastnet;
361
362 /*
363 * take the address supplied as an argument, and add it to the
364 * at_ifnet (also given). Remember ing to update
365 * those parts of the at_ifaddr that need special processing
366 */
367 bzero(AA_SAT(aa), sizeof(struct sockaddr_at));
368 bcopy(sat->sat_zero, &nr, sizeof(struct netrange));
369 bcopy(sat->sat_zero, AA_SAT(aa)->sat_zero, sizeof(struct netrange));
370 nnets = ntohs(nr.nr_lastnet) - ntohs(nr.nr_firstnet) + 1;
371 aa->aa_firstnet = nr.nr_firstnet;
372 aa->aa_lastnet = nr.nr_lastnet;
373
374 /* XXX ALC */
375 #if 0
376 printf("at_ifinit: %s: %u.%u range %u-%u phase %d\n",
377 ifp->if_name,
378 ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node,
379 ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
380 (aa->aa_flags & AFA_PHASE2) ? 2 : 1);
381 #endif
382
383 /*
384 * We could eliminate the need for a second phase 1 probe (post
385 * autoconf) if we check whether we're resetting the node. Note
386 * that phase 1 probes use only nodes, not net.node pairs. Under
387 * phase 2, both the net and node must be the same.
388 */
389 if (ifp->if_flags & IFF_LOOPBACK) {
390 AA_SAT(aa)->sat_len = sat->sat_len;
391 AA_SAT(aa)->sat_family = AF_APPLETALK;
392 AA_SAT(aa)->sat_addr.s_net = sat->sat_addr.s_net;
393 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
394 #if 0
395 } else if (fp->if_flags & IFF_POINTOPOINT) {
396 /* unimplemented */
397 /*
398 * we'd have to copy the dstaddr field over from the sat
399 * but it's not clear that it would contain the right info..
400 */
401 #endif
402 } else {
403 /*
404 * We are a normal (probably ethernet) interface.
405 * apply the new address to the interface structures etc.
406 * We will probe this address on the net first, before
407 * applying it to ensure that it is free.. If it is not, then
408 * we will try a number of other randomly generated addresses
409 * in this net and then increment the net. etc.etc. until
410 * we find an unused address.
411 */
412 aa->aa_flags |= AFA_PROBING; /* not loopback we Must probe? */
413 AA_SAT(aa)->sat_len = sizeof(struct sockaddr_at);
414 AA_SAT(aa)->sat_family = AF_APPLETALK;
415 if (aa->aa_flags & AFA_PHASE2) {
416 if (sat->sat_addr.s_net == ATADDR_ANYNET) {
417 /*
418 * If we are phase 2, and the net was not
419 * specified then we select a random net
420 * within the supplied netrange.
421 * XXX use /dev/random?
422 */
423 if (nnets != 1)
424 net = ntohs(nr.nr_firstnet) +
425 time_second % (nnets - 1);
426 else
427 net = ntohs(nr.nr_firstnet);
428 } else {
429 /*
430 * if a net was supplied, then check that it
431 * is within the netrange. If it is not then
432 * replace the old values and return an error
433 */
434 if (ntohs(sat->sat_addr.s_net) <
435 ntohs(nr.nr_firstnet) ||
436 ntohs(sat->sat_addr.s_net) >
437 ntohs(nr.nr_lastnet)) {
438 aa->aa_addr = oldaddr;
439 aa->aa_firstnet = onr.nr_firstnet;
440 aa->aa_lastnet = onr.nr_lastnet;
441 return (EINVAL);
442 }
443 /*
444 * otherwise just use the new net number..
445 */
446 net = ntohs(sat->sat_addr.s_net);
447 }
448 } else {
449 /*
450 * we must be phase one, so just use whatever we were
451 * given. I guess it really isn't going to be
452 * used... RIGHT?
453 */
454 net = ntohs(sat->sat_addr.s_net);
455 }
456
457 /*
458 * set the node part of the address into the ifaddr.
459 * If it's not specified, be random about it...
460 * XXX use /dev/random?
461 */
462 if (sat->sat_addr.s_node == ATADDR_ANYNODE)
463 AA_SAT(aa)->sat_addr.s_node = time_second;
464 else
465 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
466
467 /*
468 * Copy the phase.
469 */
470 AA_SAT(aa)->sat_range.r_netrange.nr_phase =
471 ((aa->aa_flags & AFA_PHASE2) ? 2:1);
472
473 /*
474 * step through the nets in the range
475 * starting at the (possibly random) start point.
476 */
477 for (i = nnets, netinc = 1; i > 0; net =
478 ntohs(nr.nr_firstnet) + ((net - ntohs(nr.nr_firstnet) +
479 netinc) % nnets), i--) {
480 AA_SAT(aa)->sat_addr.s_net = htons(net);
481
482 /*
483 * using a rather strange stepping method,
484 * stagger through the possible node addresses
485 * Once again, starting at the (possibly random)
486 * initial node address.
487 */
488 for (j = 0, nodeinc = time_second | 1; j < 256;
489 j++, AA_SAT(aa)->sat_addr.s_node += nodeinc) {
490 if (AA_SAT(aa)->sat_addr.s_node > 253 ||
491 AA_SAT(aa)->sat_addr.s_node < 1)
492 continue;
493 aa->aa_probcnt = 10;
494
495 /*
496 * start off the probes as an asynchronous
497 * activity. though why wait 200mSec?
498 */
499 aa->aa_ch = timeout(aarpprobe, (caddr_t)ifp,
500 hz / 5);
501 if (tsleep(aa, PPAUSE|PCATCH, "at_ifinit",
502 0)) {
503 /*
504 * theoretically we shouldn't time
505 * out here so if we returned with an
506 * error..
507 */
508 printf("at_ifinit: why did this "
509 "happen?!\n");
510 aa->aa_addr = oldaddr;
511 aa->aa_firstnet = onr.nr_firstnet;
512 aa->aa_lastnet = onr.nr_lastnet;
513 return (EINTR);
514 }
515
516 /*
517 * The async activity should have woken us
518 * up. We need to see if it was successful
519 * in finding a free spot, or if we need to
520 * iterate to the next address to try.
521 */
522 if ((aa->aa_flags & AFA_PROBING) == 0)
523 break;
524 }
525
526 /*
527 * of course we need to break out through two loops...
528 */
529 if ((aa->aa_flags & AFA_PROBING) == 0)
530 break;
531 /* reset node for next network */
532 AA_SAT(aa)->sat_addr.s_node = time_second;
533 }
534
535 /*
536 * if we are still trying to probe, then we have finished all
537 * the possible addresses, so we need to give up
538 */
539 if (aa->aa_flags & AFA_PROBING) {
540 aa->aa_addr = oldaddr;
541 aa->aa_firstnet = onr.nr_firstnet;
542 aa->aa_lastnet = onr.nr_lastnet;
543 return (EADDRINUSE);
544 }
545 }
546
547 /*
548 * Now that we have selected an address, we need to tell the interface
549 * about it, just in case it needs to adjust something.
550 */
551 if (ifp->if_ioctl != NULL &&
552 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)aa))) {
553 /*
554 * of course this could mean that it objects violently
555 * so if it does, we back out again..
556 */
557 aa->aa_addr = oldaddr;
558 aa->aa_firstnet = onr.nr_firstnet;
559 aa->aa_lastnet = onr.nr_lastnet;
560 return (error);
561 }
562
563 /*
564 * set up the netmask part of the at_ifaddr
565 * and point the appropriate pointer in the ifaddr to it.
566 * probably pointless, but what the heck.. XXX
567 */
568 bzero(&aa->aa_netmask, sizeof(aa->aa_netmask));
569 aa->aa_netmask.sat_len = sizeof(struct sockaddr_at);
570 aa->aa_netmask.sat_family = AF_APPLETALK;
571 aa->aa_netmask.sat_addr.s_net = 0xffff;
572 aa->aa_netmask.sat_addr.s_node = 0;
573 aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask); /* XXX */
574
575 /*
576 * Initialize broadcast (or remote p2p) address
577 */
578 bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr));
579 aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at);
580 aa->aa_broadaddr.sat_family = AF_APPLETALK;
581
582 aa->aa_ifa.ifa_metric = ifp->if_metric;
583 if (ifp->if_flags & IFF_BROADCAST) {
584 aa->aa_broadaddr.sat_addr.s_net = htons(0);
585 aa->aa_broadaddr.sat_addr.s_node = 0xff;
586 aa->aa_ifa.ifa_broadaddr = (struct sockaddr *)
587 &aa->aa_broadaddr;
588 /* add the range of routes needed */
589 error = aa_dorangeroute(&aa->aa_ifa, ntohs(aa->aa_firstnet),
590 ntohs(aa->aa_lastnet), RTM_ADD);
591 } else if (ifp->if_flags & IFF_POINTOPOINT) {
592 struct at_addr rtaddr, rtmask;
593
594 bzero(&rtaddr, sizeof(rtaddr));
595 bzero(&rtmask, sizeof(rtmask));
596 /* fill in the far end if we know it here XXX */
597 aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) &aa->aa_dstaddr;
598 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
599 } else if (ifp->if_flags & IFF_LOOPBACK) {
600 struct at_addr rtaddr, rtmask;
601
602 bzero(&rtaddr, sizeof(rtaddr));
603 bzero(&rtmask, sizeof(rtmask));
604 rtaddr.s_net = AA_SAT(aa)->sat_addr.s_net;
605 rtaddr.s_node = AA_SAT(aa)->sat_addr.s_node;
606 rtmask.s_net = 0xffff;
607 /* XXX should not be so.. should be HOST route */
608 rtmask.s_node = 0x0;
609 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
610 }
611
612 /*
613 * set the address of our "check if this addr is ours" routine.
614 */
615 aa->aa_ifa.ifa_claim_addr = aa_claim_addr;
616
617 /*
618 * of course if we can't add these routes we back out, but it's
619 * getting risky by now XXX
620 */
621 if (error) {
622 at_scrub(ifp, aa);
623 aa->aa_addr = oldaddr;
624 aa->aa_firstnet = onr.nr_firstnet;
625 aa->aa_lastnet = onr.nr_lastnet;
626 return (error);
627 }
628
629 /*
630 * note that the address has a route associated with it....
631 */
632 aa->aa_ifa.ifa_flags |= IFA_ROUTE;
633 aa->aa_flags |= AFA_ROUTE;
634 return (0);
635 }
636
637 /*
638 * check whether a given address is a broadcast address for us..
639 */
640 int
641 at_broadcast(struct sockaddr_at *sat)
642 {
643 struct at_ifaddr *aa;
644
645 /*
646 * If the node is not right, it can't be a broadcast
647 */
648 if (sat->sat_addr.s_node != ATADDR_BCAST)
649 return (0);
650
651 /*
652 * If the node was right then if the net is right, it's a broadcast
653 */
654 if (sat->sat_addr.s_net == ATADDR_ANYNET)
655 return (1);
656
657 /*
658 * failing that, if the net is one we have, it's a broadcast as well.
659 */
660 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
661 if ((aa->aa_ifp->if_flags & IFF_BROADCAST)
662 && (ntohs(sat->sat_addr.s_net) >= ntohs(aa->aa_firstnet)
663 && ntohs(sat->sat_addr.s_net) <= ntohs(aa->aa_lastnet)))
664 return (1);
665 }
666 return (0);
667 }
668
669 /*
670 * aa_dorangeroute()
671 *
672 * Add a route for a range of networks from bot to top - 1.
673 * Algorithm:
674 *
675 * Split the range into two subranges such that the middle
676 * of the two ranges is the point where the highest bit of difference
677 * between the two addresses makes its transition.
678 * Each of the upper and lower ranges might not exist, or might be
679 * representable by 1 or more netmasks. In addition, if both
680 * ranges can be represented by the same netmask, then they can be merged
681 * by using the next higher netmask..
682 */
683
684 static int
685 aa_dorangeroute(struct ifaddr *ifa, u_int bot, u_int top, int cmd)
686 {
687 u_int mask1;
688 struct at_addr addr;
689 struct at_addr mask;
690 int error;
691
692 /*
693 * slight sanity check
694 */
695 if (bot > top) return (EINVAL);
696
697 addr.s_node = 0;
698 mask.s_node = 0;
699 /*
700 * just start out with the lowest boundary
701 * and keep extending the mask till it's too big.
702 */
703
704 while (bot <= top) {
705 mask1 = 1;
706 while (((bot & ~mask1) >= bot) && ((bot | mask1) <= top)) {
707 mask1 <<= 1;
708 mask1 |= 1;
709 }
710 mask1 >>= 1;
711 mask.s_net = htons(~mask1);
712 addr.s_net = htons(bot);
713 if (cmd == RTM_ADD) {
714 error = aa_addsingleroute(ifa,&addr,&mask);
715 if (error) {
716 /* XXX clean up? */
717 return (error);
718 }
719 } else
720 error = aa_delsingleroute(ifa,&addr,&mask);
721 bot = (bot | mask1) + 1;
722 }
723 return (0);
724 }
725
726 static int
727 aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
728 struct at_addr *mask)
729 {
730 int error;
731
732 #if 0
733 printf("aa_addsingleroute: %x.%x mask %x.%x ...\n",
734 ntohs(addr->s_net), addr->s_node, ntohs(mask->s_net),
735 mask->s_node);
736 #endif
737
738 error = aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP);
739 if (error)
740 printf("aa_addsingleroute: error %d\n", error);
741 return (error);
742 }
743
744 static int
745 aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
746 struct at_addr *mask)
747 {
748 int error;
749
750 error = aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0);
751 if (error)
752 printf("aa_delsingleroute: error %d\n", error);
753 return (error);
754 }
755
756 static int
757 aa_dosingleroute(struct ifaddr *ifa, struct at_addr *at_addr,
758 struct at_addr *at_mask, int cmd, int flags)
759 {
760 struct sockaddr_at addr, mask;
761
762 bzero(&addr, sizeof(addr));
763 bzero(&mask, sizeof(mask));
764 addr.sat_family = AF_APPLETALK;
765 addr.sat_len = sizeof(struct sockaddr_at);
766 addr.sat_addr.s_net = at_addr->s_net;
767 addr.sat_addr.s_node = at_addr->s_node;
768 mask.sat_family = AF_APPLETALK;
769 mask.sat_len = sizeof(struct sockaddr_at);
770 mask.sat_addr.s_net = at_mask->s_net;
771 mask.sat_addr.s_node = at_mask->s_node;
772 if (at_mask->s_node)
773 flags |= RTF_HOST;
774 return (rtrequest(cmd, (struct sockaddr *) &addr,
775 (flags & RTF_HOST)?(ifa->ifa_dstaddr):(ifa->ifa_addr),
776 (struct sockaddr *) &mask, flags, NULL));
777 }
778
779 #if 0
780
781 static void
782 aa_clean(void)
783 {
784 struct at_ifaddr *aa;
785 struct ifaddr *ifa;
786 struct ifnet *ifp;
787
788 while ((aa = at_ifaddr_list) != NULL) {
789 ifp = aa->aa_ifp;
790 at_scrub(ifp, aa);
791 at_ifaddr_list = aa->aa_next;
792 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)aa)
793 ifp->if_addrlist = ifa->ifa_next;
794 else {
795 while (ifa->ifa_next &&
796 (ifa->ifa_next != (struct ifaddr *)aa))
797 ifa = ifa->ifa_next;
798 if (ifa->ifa_next)
799 ifa->ifa_next =
800 ((struct ifaddr *)aa)->ifa_next;
801 else
802 panic("at_entry");
803 }
804 }
805 }
806
807 #endif
808
809 static int
810 aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw0)
811 {
812 struct sockaddr_at *addr = (struct sockaddr_at *)ifa->ifa_addr;
813 struct sockaddr_at *gw = (struct sockaddr_at *)gw0;
814
815 switch (gw->sat_range.r_netrange.nr_phase) {
816 case 1:
817 if(addr->sat_range.r_netrange.nr_phase == 1)
818 return (1);
819
820 case 0:
821 case 2:
822 /*
823 * if it's our net (including 0),
824 * or netranges are valid, and we are in the range,
825 * then it's ours.
826 */
827 if ((addr->sat_addr.s_net == gw->sat_addr.s_net)
828 || ((addr->sat_range.r_netrange.nr_lastnet)
829 && (ntohs(gw->sat_addr.s_net) >=
830 ntohs(addr->sat_range.r_netrange.nr_firstnet))
831 && (ntohs(gw->sat_addr.s_net) <=
832 ntohs(addr->sat_range.r_netrange.nr_lastnet))))
833 return (1);
834 break;
835 default:
836 printf("atalk: bad phase\n");
837 }
838 return (0);
839 }
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