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1 /*-
2  * Copyright (c) 1990,1991 Regents of The University of Michigan.
3  * Copyright (c) 2009 Robert N. M. Watson
4  * All Rights Reserved.
5  *
6  * Permission to use, copy, modify, and distribute this software and
7  * its documentation for any purpose and without fee is hereby granted,
8  * provided that the above copyright notice appears in all copies and
9  * that both that copyright notice and this permission notice appear
10  * in supporting documentation, and that the name of The University
11  * of Michigan not be used in advertising or publicity pertaining to
12  * distribution of the software without specific, written prior
13  * permission. This software is supplied as is without expressed or
14  * implied warranties of any kind.
15  *
16  * This product includes software developed by the University of
17  * California, Berkeley and its contributors.
18  *
19  *      Research Systems Unix Group
20  *      The University of Michigan
21  *      c/o Wesley Craig
22  *      535 W. William Street
23  *      Ann Arbor, Michigan
24  *      +1-313-764-2278
25  *      netatalk@umich.edu
26  */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/sockio.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
37 #include <sys/priv.h>
38 #include <sys/rwlock.h>
39 #include <sys/socket.h>
40 #include <net/if.h>
41 #include <net/route.h>
42 #include <netinet/in.h>
43 #undef s_net
44 #include <netinet/if_ether.h>
45
46 #include <netatalk/at.h>
47 #include <netatalk/at_var.h>
48 #include <netatalk/at_extern.h>
49
50 struct rwlock            at_ifaddr_rw;
51 struct at_ifaddrhead     at_ifaddrhead;
52
53 RW_SYSINIT(at_ifaddr_rw, &at_ifaddr_rw, "at_ifaddr_rw");
54
55 static int aa_dorangeroute(struct ifaddr *ifa, u_int first, u_int last,
56             int cmd);
57 static int aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
58             struct at_addr *mask);
59 static int aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
60             struct at_addr *mask);
61 static int aa_dosingleroute(struct ifaddr *ifa, struct at_addr *addr,
62             struct at_addr *mask, int cmd, int flags);
63 static int at_scrub(struct ifnet *ifp, struct at_ifaddr *aa);
64 static int at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa,
65             struct sockaddr_at *sat);
66 static int aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw);
67
68 #define sateqaddr(a,b)                                                  \
69         ((a)->sat_len == (b)->sat_len &&                                \
70         (a)->sat_family == (b)->sat_family &&                           \
71         (a)->sat_addr.s_net == (b)->sat_addr.s_net &&                   \
72         (a)->sat_addr.s_node == (b)->sat_addr.s_node)
73
74 int
75 at_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
76     struct thread *td)
77 {
78         struct ifreq *ifr = (struct ifreq *)data;
79         struct sockaddr_at *sat;
80         struct netrange *nr;
81         struct at_aliasreq *ifra = (struct at_aliasreq *)data;
82         struct at_ifaddr *aa;
83         struct ifaddr *ifa;
84         int error;
85
86         /*
87          * If we have an ifp, then find the matching at_ifaddr if it exists
88          */
89         aa = NULL;
90         AT_IFADDR_RLOCK();
91         if (ifp != NULL) {
92                 TAILQ_FOREACH(aa, &at_ifaddrhead, aa_link) {
93                         if (aa->aa_ifp == ifp)
94                                 break;
95                 }
96         }
97         if (aa != NULL)
98                 ifa_ref(&aa->aa_ifa);
99         AT_IFADDR_RUNLOCK();
100
101         /*
102          * In this first switch table we are basically getting ready for
103          * the second one, by getting the atalk-specific things set up
104          * so that they start to look more similar to other protocols etc.
105          */
106         error = 0;
107         switch (cmd) {
108         case SIOCAIFADDR:
109         case SIOCDIFADDR:
110                 /*
111                  * If we have an appletalk sockaddr, scan forward of where we
112                  * are now on the at_ifaddr list to find one with a matching 
113                  * address on this interface.  This may leave aa pointing to
114                  * the first address on the NEXT interface!
115                  */
116                 if (ifra->ifra_addr.sat_family == AF_APPLETALK) {
117                         struct at_ifaddr *oaa;
118
119                         AT_IFADDR_RLOCK();
120                         for (oaa = aa; aa; aa = TAILQ_NEXT(aa, aa_link)) {
121                                 if (aa->aa_ifp == ifp &&
122                                     sateqaddr(&aa->aa_addr, &ifra->ifra_addr))
123                                         break;
124                         }
125                         if (oaa != NULL && oaa != aa)
126                                 ifa_free(&oaa->aa_ifa);
127                         if (aa != NULL && oaa != aa)
128                                 ifa_ref(&aa->aa_ifa);
129                         AT_IFADDR_RUNLOCK();
130                 }
131                 /*
132                  * If we a retrying to delete an addres but didn't find such,
133                  * then rewurn with an error
134                  */
135                 if (cmd == SIOCDIFADDR && aa == NULL) {
136                         error = EADDRNOTAVAIL;
137                         goto out;
138                 }
139                 /*FALLTHROUGH*/
140
141         case SIOCSIFADDR:
142                 /* 
143                  * If we are not superuser, then we don't get to do these ops.
144                  *
145                  * XXXRW: Layering?
146                  */
147                 if (priv_check(td, PRIV_NET_ADDIFADDR)) {
148                         error = EPERM;
149                         goto out;
150                 }
151
152                 sat = satosat(&ifr->ifr_addr);
153                 nr = (struct netrange *)sat->sat_zero;
154                 if (nr->nr_phase == 1) {
155                         struct at_ifaddr *oaa;
156
157                         /*
158                          * Look for a phase 1 address on this interface.
159                          * This may leave aa pointing to the first address on
160                          * the NEXT interface!
161                          */
162                         AT_IFADDR_RLOCK();
163                         for (oaa = aa; aa; aa = TAILQ_NEXT(aa, aa_link)) {
164                                 if (aa->aa_ifp == ifp &&
165                                     (aa->aa_flags & AFA_PHASE2) == 0)
166                                         break;
167                         }
168                         if (oaa != NULL && oaa != aa)
169                                 ifa_free(&oaa->aa_ifa);
170                         if (aa != NULL && oaa != aa)
171                                 ifa_ref(&aa->aa_ifa);
172                         AT_IFADDR_RUNLOCK();
173                 } else {                /* default to phase 2 */
174                         struct at_ifaddr *oaa;
175
176                         /*
177                          * Look for a phase 2 address on this interface.
178                          * This may leave aa pointing to the first address on
179                          * the NEXT interface!
180                          */
181                         AT_IFADDR_RLOCK();
182                         for (oaa = aa; aa; aa = TAILQ_NEXT(aa, aa_link)) {
183                                 if (aa->aa_ifp == ifp && (aa->aa_flags &
184                                     AFA_PHASE2))
185                                         break;
186                         }
187                         if (oaa != NULL && oaa != aa)
188                                 ifa_free(&oaa->aa_ifa);
189                         if (aa != NULL && oaa != aa)
190                                 ifa_ref(&aa->aa_ifa);
191                         AT_IFADDR_RUNLOCK();
192                 }
193
194                 if (ifp == NULL)
195                         panic("at_control");
196
197                 /*
198                  * If we failed to find an existing at_ifaddr entry, then we 
199                  * allocate a fresh one. 
200                  */
201                 if (aa == NULL) {
202                         aa = malloc(sizeof(struct at_ifaddr), M_IFADDR,
203                             M_NOWAIT | M_ZERO);
204                         if (aa == NULL) {
205                                 error = ENOBUFS;
206                                 goto out;
207                         }
208                         callout_init(&aa->aa_callout, CALLOUT_MPSAFE);
209
210                         ifa = (struct ifaddr *)aa;
211                         ifa_init(ifa);
212
213                         /*
214                          * As the at_ifaddr contains the actual sockaddrs,
215                          * and the ifaddr itself, link them all together
216                          * correctly.
217                          */
218                         ifa->ifa_addr = (struct sockaddr *)&aa->aa_addr;
219                         ifa->ifa_dstaddr = (struct sockaddr *)&aa->aa_addr;
220                         ifa->ifa_netmask = (struct sockaddr *)&aa->aa_netmask;
221
222                         /*
223                          * Set/clear the phase 2 bit.
224                          */
225                         if (nr->nr_phase == 1)
226                                 aa->aa_flags &= ~AFA_PHASE2;
227                         else
228                                 aa->aa_flags |= AFA_PHASE2;
229
230                         ifa_ref(&aa->aa_ifa);           /* at_ifaddrhead */
231                         AT_IFADDR_WLOCK();
232                         if (!TAILQ_EMPTY(&at_ifaddrhead)) {
233                                 /*
234                                  * Don't let the loopback be first, since the
235                                  * first address is the machine's default
236                                  * address for binding.  If it is, stick
237                                  * ourself in front, otherwise go to the back
238                                  * of the list.
239                                  */
240                                 if (TAILQ_FIRST(&at_ifaddrhead)->aa_ifp->
241                                     if_flags & IFF_LOOPBACK)
242                                         TAILQ_INSERT_HEAD(&at_ifaddrhead, aa,
243                                             aa_link);
244                                 else
245                                         TAILQ_INSERT_TAIL(&at_ifaddrhead, aa,
246                                             aa_link);
247                         } else
248                                 TAILQ_INSERT_HEAD(&at_ifaddrhead, aa,
249                                     aa_link);
250                         AT_IFADDR_WUNLOCK();
251
252                         /*
253                          * and link it all together
254                          */
255                         aa->aa_ifp = ifp;
256                         ifa_ref(&aa->aa_ifa);           /* if_addrhead */
257                         IF_ADDR_WLOCK(ifp);
258                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
259                         IF_ADDR_WUNLOCK(ifp);
260                 } else {
261                         /*
262                          * If we DID find one then we clobber any routes
263                          * dependent on it..
264                          */
265                         at_scrub(ifp, aa);
266                 }
267                 break;
268
269         case SIOCGIFADDR :
270                 sat = satosat(&ifr->ifr_addr);
271                 nr = (struct netrange *)sat->sat_zero;
272                 if (nr->nr_phase == 1) {
273                         struct at_ifaddr *oaa;
274
275                         /*
276                          * If the request is specifying phase 1, then
277                          * only look at a phase one address
278                          */
279                         AT_IFADDR_RLOCK();
280                         for (oaa = aa; aa; aa = TAILQ_NEXT(aa, aa_link)) {
281                                 if (aa->aa_ifp == ifp &&
282                                     (aa->aa_flags & AFA_PHASE2) == 0)
283                                         break;
284                         }
285                         if (oaa != NULL && oaa != aa)
286                                 ifa_free(&oaa->aa_ifa);
287                         if (aa != NULL && oaa != aa)
288                                 ifa_ref(&aa->aa_ifa);
289                         AT_IFADDR_RUNLOCK();
290                 } else {
291                         struct at_ifaddr *oaa;
292
293                         /*
294                          * default to phase 2
295                          */
296                         AT_IFADDR_RLOCK();
297                         for (oaa = aa; aa; aa = TAILQ_NEXT(aa, aa_link)) {
298                                 if (aa->aa_ifp == ifp && (aa->aa_flags &
299                                     AFA_PHASE2))
300                                         break;
301                         }
302                         if (oaa != NULL && oaa != aa)
303                                 ifa_free(&oaa->aa_ifa);
304                         if (aa != NULL && oaa != aa)
305                                 ifa_ref(&aa->aa_ifa);
306                         AT_IFADDR_RUNLOCK();
307                 }
308
309                 if (aa == NULL) {
310                         error = EADDRNOTAVAIL;
311                         goto out;
312                 }
313                 break;
314         }
315
316         /*
317          * By the time this switch is run we should be able to assume that
318          * the "aa" pointer is valid when needed.
319          */
320         switch (cmd) {
321         case SIOCGIFADDR:
322
323                 /*
324                  * copy the contents of the sockaddr blindly.
325                  */
326                 sat = (struct sockaddr_at *)&ifr->ifr_addr;
327                 *sat = aa->aa_addr;
328
329                 /* 
330                  * and do some cleanups
331                  */
332                 ((struct netrange *)&sat->sat_zero)->nr_phase
333                     = (aa->aa_flags & AFA_PHASE2) ? 2 : 1;
334                 ((struct netrange *)&sat->sat_zero)->nr_firstnet =
335                     aa->aa_firstnet;
336                 ((struct netrange *)&sat->sat_zero)->nr_lastnet =
337                     aa->aa_lastnet;
338                 break;
339
340         case SIOCSIFADDR:
341                 error = at_ifinit(ifp, aa,
342                     (struct sockaddr_at *)&ifr->ifr_addr);
343                 goto out;
344
345         case SIOCAIFADDR:
346                 if (sateqaddr(&ifra->ifra_addr, &aa->aa_addr)) {
347                         error = 0;
348                         goto out;
349                 }
350                 error = at_ifinit(ifp, aa,
351                     (struct sockaddr_at *)&ifr->ifr_addr);
352                 goto out;
353
354         case SIOCDIFADDR:
355
356                 /*
357                  * remove the ifaddr from the interface
358                  */
359                 ifa = (struct ifaddr *)aa;
360                 IF_ADDR_WLOCK(ifp);
361                 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
362                 IF_ADDR_WUNLOCK(ifp);
363                 ifa_free(ifa);                          /* if_addrhead */
364
365                 /*
366                  * Now remove the at_ifaddr from the parallel structure
367                  * as well, or we'd be in deep trouble
368                  */
369
370                 AT_IFADDR_WLOCK();
371                 TAILQ_REMOVE(&at_ifaddrhead, aa, aa_link);
372                 AT_IFADDR_WUNLOCK();
373                 ifa_free(ifa);                          /* at_ifaddrhead */
374                 break;
375
376         default:
377                 if (ifp == NULL || ifp->if_ioctl == NULL) {
378                         error = EOPNOTSUPP;
379                         goto out;
380                 }
381                 error = ((*ifp->if_ioctl)(ifp, cmd, data));
382         }
383
384 out:
385         if (aa != NULL)
386                 ifa_free(&aa->aa_ifa);
387         return (error);
388 }
389
390 /* 
391  * Given an interface and an at_ifaddr (supposedly on that interface)
392  * remove  any routes that depend on this.
393  * Why ifp is needed I'm not sure,
394  * as aa->at_ifaddr.ifa_ifp should be the same.
395  */
396 static int
397 at_scrub(struct ifnet *ifp, struct at_ifaddr *aa)
398 {
399         int error;
400
401         if (aa->aa_flags & AFA_ROUTE) {
402                 if (ifp->if_flags & IFF_LOOPBACK) {
403                         if ((error = aa_delsingleroute(&aa->aa_ifa,
404                             &aa->aa_addr.sat_addr, &aa->aa_netmask.sat_addr))
405                             != 0)
406                                 return (error);
407                 } else if (ifp->if_flags & IFF_POINTOPOINT) {
408                         if ((error = rtinit(&aa->aa_ifa, RTM_DELETE,
409                             RTF_HOST)) != 0)
410                                 return (error);
411                 } else if (ifp->if_flags & IFF_BROADCAST) {
412                         error = aa_dorangeroute(&aa->aa_ifa,
413                             ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
414                             RTM_DELETE);
415                 }
416                 aa->aa_ifa.ifa_flags &= ~IFA_ROUTE;
417                 aa->aa_flags &= ~AFA_ROUTE;
418         }
419         return (0);
420 }
421
422 /*
423  * given an at_ifaddr,a sockaddr_at and an ifp,
424  * bang them all together at high speed and see what happens
425  */
426 static int 
427 at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, struct sockaddr_at *sat)
428 {
429         struct netrange nr, onr;
430         struct sockaddr_at oldaddr;
431         int error = 0, i, j;
432         int netinc, nodeinc, nnets;
433         u_short net;
434
435         /* 
436          * save the old addresses in the at_ifaddr just in case we need them.
437          */
438         oldaddr = aa->aa_addr;
439         onr.nr_firstnet = aa->aa_firstnet;
440         onr.nr_lastnet = aa->aa_lastnet;
441
442         /*
443          * take the address supplied as an argument, and add it to the 
444          * at_ifnet (also given). Remember ing to update
445          * those parts of the at_ifaddr that need special processing
446          */
447         bzero(AA_SAT(aa), sizeof(struct sockaddr_at));
448         bcopy(sat->sat_zero, &nr, sizeof(struct netrange));
449         bcopy(sat->sat_zero, AA_SAT(aa)->sat_zero, sizeof(struct netrange));
450         nnets = ntohs(nr.nr_lastnet) - ntohs(nr.nr_firstnet) + 1;
451         aa->aa_firstnet = nr.nr_firstnet;
452         aa->aa_lastnet = nr.nr_lastnet;
453
454 /* XXX ALC */
455 #if 0
456         printf("at_ifinit: %s: %u.%u range %u-%u phase %d\n",
457             ifp->if_name,
458             ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node,
459             ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
460             (aa->aa_flags & AFA_PHASE2) ? 2 : 1);
461 #endif
462
463         /*
464          * We could eliminate the need for a second phase 1 probe (post
465          * autoconf) if we check whether we're resetting the node. Note
466          * that phase 1 probes use only nodes, not net.node pairs.  Under
467          * phase 2, both the net and node must be the same.
468          */
469         if (ifp->if_flags & IFF_LOOPBACK) {
470                 AA_SAT(aa)->sat_len = sat->sat_len;
471                 AA_SAT(aa)->sat_family = AF_APPLETALK;
472                 AA_SAT(aa)->sat_addr.s_net = sat->sat_addr.s_net;
473                 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
474 #if 0
475         } else if (fp->if_flags & IFF_POINTOPOINT) {
476                 /* unimplemented */
477                 /*
478                  * we'd have to copy the dstaddr field over from the sat 
479                  * but it's not clear that it would contain the right info..
480                  */
481 #endif
482         } else {
483                 /*
484                  * We are a normal (probably ethernet) interface.
485                  * apply the new address to the interface structures etc.
486                  * We will probe this address on the net first, before
487                  * applying it to ensure that it is free.. If it is not, then
488                  * we will try a number of other randomly generated addresses
489                  * in this net and then increment the net.  etc.etc. until
490                  * we find an unused address.
491                  */
492                 aa->aa_flags |= AFA_PROBING; /* not loopback we Must probe? */
493                 AA_SAT(aa)->sat_len = sizeof(struct sockaddr_at);
494                 AA_SAT(aa)->sat_family = AF_APPLETALK;
495                 if (aa->aa_flags & AFA_PHASE2) {
496                         if (sat->sat_addr.s_net == ATADDR_ANYNET) {
497                                 /*
498                                  * If we are phase 2, and the net was not
499                                  * specified then we select a random net
500                                  * within the supplied netrange.
501                                  * XXX use /dev/random?
502                                  */
503                                 if (nnets != 1)
504                                         net = ntohs(nr.nr_firstnet) +
505                                             time_second % (nnets - 1);
506                                 else
507                                         net = ntohs(nr.nr_firstnet);
508                         } else {
509                                 /*
510                                  * if a net was supplied, then check that it
511                                  * is within the netrange. If it is not then
512                                  * replace the old values and return an error
513                                  */
514                                 if (ntohs(sat->sat_addr.s_net) <
515                                     ntohs(nr.nr_firstnet) ||
516                                     ntohs(sat->sat_addr.s_net) >
517                                     ntohs(nr.nr_lastnet)) {
518                                         aa->aa_addr = oldaddr;
519                                         aa->aa_firstnet = onr.nr_firstnet;
520                                         aa->aa_lastnet = onr.nr_lastnet;
521                                         return (EINVAL);
522                                 }
523                                 /*
524                                  * otherwise just use the new net number..
525                                  */
526                                 net = ntohs(sat->sat_addr.s_net);
527                         }
528                 } else {
529                         /*
530                          * we must be phase one, so just use whatever we were
531                          * given.  I guess it really isn't going to be
532                          * used... RIGHT?
533                          */
534                         net = ntohs(sat->sat_addr.s_net);
535                 }
536
537                 /* 
538                  * set the node part of the address into the ifaddr.
539                  * If it's not specified, be random about it...
540                  * XXX use /dev/random?
541                  */
542                 if (sat->sat_addr.s_node == ATADDR_ANYNODE)
543                         AA_SAT(aa)->sat_addr.s_node = time_second;
544                 else
545                         AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
546
547                 /* 
548                  * Copy the phase.
549                  */
550                 AA_SAT(aa)->sat_range.r_netrange.nr_phase =
551                     ((aa->aa_flags & AFA_PHASE2) ? 2:1);
552
553                 /* 
554                  * step through the nets in the range
555                  * starting at the (possibly random) start point.
556                  */
557                 for (i = nnets, netinc = 1; i > 0; net =
558                     ntohs(nr.nr_firstnet) + ((net - ntohs(nr.nr_firstnet) +
559                     netinc) % nnets), i--) {
560                         AA_SAT(aa)->sat_addr.s_net = htons(net);
561
562                         /*
563                          * using a rather strange stepping method,
564                          * stagger through the possible node addresses
565                          * Once again, starting at the (possibly random)
566                          * initial node address.
567                          */
568                         for (j = 0, nodeinc = time_second | 1; j < 256;
569                             j++, AA_SAT(aa)->sat_addr.s_node += nodeinc) {
570                                 if (AA_SAT(aa)->sat_addr.s_node > 253 ||
571                                     AA_SAT(aa)->sat_addr.s_node < 1)
572                                         continue;
573                                 aa->aa_probcnt = 10;
574         
575                                 /*
576                                  * start off the probes as an asynchronous
577                                  * activity.  though why wait 200mSec?
578                                  */
579                                 AARPTAB_LOCK();
580                                 callout_reset(&aa->aa_callout, hz / 5,
581                                     aarpprobe, ifp);
582                                 if (msleep(aa, &aarptab_mtx, PPAUSE|PCATCH,
583                                     "at_ifinit", 0)) {
584                                         AARPTAB_UNLOCK();
585                                         /*
586                                          * theoretically we shouldn't time
587                                          * out here so if we returned with an
588                                          * error..
589                                          */
590                                         printf("at_ifinit: why did this "
591                                             "happen?!\n");
592                                         aa->aa_addr = oldaddr;
593                                         aa->aa_firstnet = onr.nr_firstnet;
594                                         aa->aa_lastnet = onr.nr_lastnet;
595                                         return (EINTR);
596                                 }
597                                 AARPTAB_UNLOCK();
598
599                                 /* 
600                                  * The async activity should have woken us
601                                  * up.  We need to see if it was successful
602                                  * in finding a free spot, or if we need to
603                                  * iterate to the next address to try.
604                                  */
605                                 if ((aa->aa_flags & AFA_PROBING) == 0)
606                                         break;
607                         }
608
609                         /*
610                          * of course we need to break out through two loops...
611                          */
612                         if ((aa->aa_flags & AFA_PROBING) == 0)
613                                 break;
614                         /* reset node for next network */
615                         AA_SAT(aa)->sat_addr.s_node = time_second;
616                 }
617
618                 /*
619                  * if we are still trying to probe, then we have finished all
620                  * the possible addresses, so we need to give up
621                  */
622                 if (aa->aa_flags & AFA_PROBING) {
623                         aa->aa_addr = oldaddr;
624                         aa->aa_firstnet = onr.nr_firstnet;
625                         aa->aa_lastnet = onr.nr_lastnet;
626                         return (EADDRINUSE);
627                 }
628         }
629
630         /* 
631          * Now that we have selected an address, we need to tell the interface
632          * about it, just in case it needs to adjust something.
633          */
634         if (ifp->if_ioctl != NULL &&
635             (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)aa))) {
636                 /*
637                  * of course this could mean that it objects violently
638                  * so if it does, we back out again..
639                  */
640                 aa->aa_addr = oldaddr;
641                 aa->aa_firstnet = onr.nr_firstnet;
642                 aa->aa_lastnet = onr.nr_lastnet;
643                 return (error);
644         }
645
646         /* 
647          * set up the netmask part of the at_ifaddr
648          * and point the appropriate pointer in the ifaddr to it.
649          * probably pointless, but what the heck.. XXX
650          */
651         bzero(&aa->aa_netmask, sizeof(aa->aa_netmask));
652         aa->aa_netmask.sat_len = sizeof(struct sockaddr_at);
653         aa->aa_netmask.sat_family = AF_APPLETALK;
654         aa->aa_netmask.sat_addr.s_net = 0xffff;
655         aa->aa_netmask.sat_addr.s_node = 0;
656         aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask); /* XXX */
657
658         /*
659          * Initialize broadcast (or remote p2p) address
660          */
661         bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr));
662         aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at);
663         aa->aa_broadaddr.sat_family = AF_APPLETALK;
664
665         aa->aa_ifa.ifa_metric = ifp->if_metric;
666         if (ifp->if_flags & IFF_BROADCAST) {
667                 aa->aa_broadaddr.sat_addr.s_net = htons(0);
668                 aa->aa_broadaddr.sat_addr.s_node = 0xff;
669                 aa->aa_ifa.ifa_broadaddr = (struct sockaddr *)
670                     &aa->aa_broadaddr;
671                 /* add the range of routes needed */
672                 error = aa_dorangeroute(&aa->aa_ifa, ntohs(aa->aa_firstnet),
673                     ntohs(aa->aa_lastnet), RTM_ADD);
674         } else if (ifp->if_flags & IFF_POINTOPOINT) {
675                 struct at_addr  rtaddr, rtmask;
676
677                 bzero(&rtaddr, sizeof(rtaddr));
678                 bzero(&rtmask, sizeof(rtmask));
679                 /* fill in the far end if we know it here XXX */
680                 aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) &aa->aa_dstaddr;
681                 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
682         } else if (ifp->if_flags & IFF_LOOPBACK) {
683                 struct at_addr  rtaddr, rtmask;
684
685                 bzero(&rtaddr, sizeof(rtaddr));
686                 bzero(&rtmask, sizeof(rtmask));
687                 rtaddr.s_net = AA_SAT(aa)->sat_addr.s_net;
688                 rtaddr.s_node = AA_SAT(aa)->sat_addr.s_node;
689                 rtmask.s_net = 0xffff;
690                  /* XXX should not be so.. should be HOST route */
691                 rtmask.s_node = 0x0;
692                 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
693         }
694
695         /*
696          * set the address of our "check if this addr is ours" routine.
697          */
698         aa->aa_ifa.ifa_claim_addr = aa_claim_addr;
699
700         /*
701          * of course if we can't add these routes we back out, but it's
702          * getting risky by now XXX
703          */
704         if (error) {
705                 at_scrub(ifp, aa);
706                 aa->aa_addr = oldaddr;
707                 aa->aa_firstnet = onr.nr_firstnet;
708                 aa->aa_lastnet = onr.nr_lastnet;
709                 return (error);
710         }
711
712         /*
713          * note that the address has a route associated with it....
714          */
715         aa->aa_ifa.ifa_flags |= IFA_ROUTE;
716         aa->aa_flags |= AFA_ROUTE;
717         return (0);
718 }
719
720 /*
721  * check whether a given address is a broadcast address for us..
722  */
723 int
724 at_broadcast(struct sockaddr_at *sat)
725 {
726         struct at_ifaddr *aa;
727
728         AT_IFADDR_LOCK_ASSERT();
729
730         /*
731          * If the node is not right, it can't be a broadcast 
732          */
733         if (sat->sat_addr.s_node != ATADDR_BCAST)
734                 return (0);
735
736         /*
737          * If the node was right then if the net is right, it's a broadcast
738          */
739         if (sat->sat_addr.s_net == ATADDR_ANYNET)
740                 return (1);
741
742         /*
743          * failing that, if the net is one we have, it's a broadcast as well.
744          */
745         TAILQ_FOREACH(aa, &at_ifaddrhead, aa_link) {
746                 if ((aa->aa_ifp->if_flags & IFF_BROADCAST)
747                     && (ntohs(sat->sat_addr.s_net) >= ntohs(aa->aa_firstnet)
748                     && ntohs(sat->sat_addr.s_net) <= ntohs(aa->aa_lastnet)))
749                         return (1);
750         }
751         return (0);
752 }
753
754 /*
755  * aa_dorangeroute()
756  *
757  * Add a route for a range of networks from bot to top - 1.
758  * Algorithm:
759  *
760  * Split the range into two subranges such that the middle
761  * of the two ranges is the point where the highest bit of difference
762  * between the two addresses makes its transition.
763  * Each of the upper and lower ranges might not exist, or might be 
764  * representable by 1 or more netmasks. In addition, if both
765  * ranges can be represented by the same netmask, then they can be merged
766  * by using the next higher netmask..
767  */
768
769 static int
770 aa_dorangeroute(struct ifaddr *ifa, u_int bot, u_int top, int cmd)
771 {
772         u_int mask1;
773         struct at_addr addr;
774         struct at_addr mask;
775         int error;
776
777         /*
778          * slight sanity check
779          */
780         if (bot > top) return (EINVAL);
781
782         addr.s_node = 0;
783         mask.s_node = 0;
784         /*
785          * just start out with the lowest boundary
786          * and keep extending the mask till it's too big.
787          */
788         
789          while (bot <= top) {
790                 mask1 = 1;
791                 while (((bot & ~mask1) >= bot) && ((bot | mask1) <= top)) {
792                         mask1 <<= 1;
793                         mask1 |= 1;
794                 }
795                 mask1 >>= 1;
796                 mask.s_net = htons(~mask1);
797                 addr.s_net = htons(bot);
798                 if (cmd == RTM_ADD) {
799                         error =  aa_addsingleroute(ifa,&addr,&mask);
800                         if (error) {
801                                 /* XXX clean up? */
802                                 return (error);
803                         }
804                 } else
805                         error =  aa_delsingleroute(ifa,&addr,&mask);
806                 bot = (bot | mask1) + 1;
807         }
808         return (0);
809 }
810
811 static int
812 aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
813     struct at_addr *mask)
814 {
815
816 #if 0
817         printf("aa_addsingleroute: %x.%x mask %x.%x ...\n",
818             ntohs(addr->s_net), addr->s_node, ntohs(mask->s_net),
819             mask->s_node);
820 #endif
821
822         return (aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP));
823 }
824
825 static int
826 aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
827     struct at_addr *mask)
828 {
829
830         return (aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0));
831 }
832
833 static int
834 aa_dosingleroute(struct ifaddr *ifa, struct at_addr *at_addr,
835     struct at_addr *at_mask, int cmd, int flags)
836 {
837         struct sockaddr_at addr, mask;
838
839         bzero(&addr, sizeof(addr));
840         bzero(&mask, sizeof(mask));
841         addr.sat_family = AF_APPLETALK;
842         addr.sat_len = sizeof(struct sockaddr_at);
843         addr.sat_addr.s_net = at_addr->s_net;
844         addr.sat_addr.s_node = at_addr->s_node;
845         mask.sat_family = AF_APPLETALK;
846         mask.sat_len = sizeof(struct sockaddr_at);
847         mask.sat_addr.s_net = at_mask->s_net;
848         mask.sat_addr.s_node = at_mask->s_node;
849         if (at_mask->s_node)
850                 flags |= RTF_HOST;
851         return (rtrequest(cmd, (struct sockaddr *) &addr,
852             (flags & RTF_HOST)?(ifa->ifa_dstaddr):(ifa->ifa_addr),
853             (struct sockaddr *) &mask, flags, NULL));
854 }
855
856 static int
857 aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw0)
858 {
859         struct sockaddr_at *addr = (struct sockaddr_at *)ifa->ifa_addr;
860         struct sockaddr_at *gw = (struct sockaddr_at *)gw0;
861
862         switch (gw->sat_range.r_netrange.nr_phase) {
863         case 1:
864                 if(addr->sat_range.r_netrange.nr_phase == 1)
865                         return (1);
866
867         case 0:
868         case 2:
869                 /*
870                  * if it's our net (including 0),
871                  * or netranges are valid, and we are in the range,
872                  * then it's ours.
873                  */
874                 if ((addr->sat_addr.s_net == gw->sat_addr.s_net)
875                     || ((addr->sat_range.r_netrange.nr_lastnet)
876                     && (ntohs(gw->sat_addr.s_net) >=
877                     ntohs(addr->sat_range.r_netrange.nr_firstnet))
878                     && (ntohs(gw->sat_addr.s_net) <=
879                     ntohs(addr->sat_range.r_netrange.nr_lastnet))))
880                         return (1);
881                 break;
882         default:
883                 printf("atalk: bad phase\n");
884         }
885         return (0);
886 }