1 | /* $NetBSD: aarp.c,v 1.39 2016/08/01 03:15:30 ozaki-r Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1990,1991 Regents of The University of Michigan. |
5 | * All Rights Reserved. |
6 | * |
7 | * Permission to use, copy, modify, and distribute this software and |
8 | * its documentation for any purpose and without fee is hereby granted, |
9 | * provided that the above copyright notice appears in all copies and |
10 | * that both that copyright notice and this permission notice appear |
11 | * in supporting documentation, and that the name of The University |
12 | * of Michigan not be used in advertising or publicity pertaining to |
13 | * distribution of the software without specific, written prior |
14 | * permission. This software is supplied as is without expressed or |
15 | * implied warranties of any kind. |
16 | * |
17 | * This product includes software developed by the University of |
18 | * California, Berkeley and its contributors. |
19 | * |
20 | * Research Systems Unix Group |
21 | * The University of Michigan |
22 | * c/o Wesley Craig |
23 | * 535 W. William Street |
24 | * Ann Arbor, Michigan |
25 | * +1-313-764-2278 |
26 | * netatalk@umich.edu |
27 | */ |
28 | |
29 | #include <sys/cdefs.h> |
30 | __KERNEL_RCSID(0, "$NetBSD: aarp.c,v 1.39 2016/08/01 03:15:30 ozaki-r Exp $" ); |
31 | |
32 | #include "opt_mbuftrace.h" |
33 | |
34 | #include <sys/param.h> |
35 | #include <sys/socket.h> |
36 | #include <sys/syslog.h> |
37 | #include <sys/systm.h> |
38 | #include <sys/callout.h> |
39 | #include <sys/proc.h> |
40 | #include <sys/mbuf.h> |
41 | #include <sys/time.h> |
42 | #include <sys/kernel.h> |
43 | #include <sys/socketvar.h> |
44 | #include <net/if.h> |
45 | #include <net/route.h> |
46 | #include <net/if_ether.h> |
47 | #include <net/if_dl.h> |
48 | #include <netinet/in.h> |
49 | #undef s_net |
50 | |
51 | #include <netatalk/at.h> |
52 | #include <netatalk/at_var.h> |
53 | #include <netatalk/aarp.h> |
54 | #include <netatalk/ddp_var.h> |
55 | #include <netatalk/phase2.h> |
56 | #include <netatalk/at_extern.h> |
57 | |
58 | static struct aarptab *aarptnew(const struct at_addr *); |
59 | static void aarptfree(struct aarptab *); |
60 | static void at_aarpinput(struct ifnet *, struct mbuf *); |
61 | static void aarptimer(void *); |
62 | static void aarpwhohas(struct ifnet *, const struct sockaddr_at *); |
63 | |
64 | #define AARPTAB_BSIZ 9 |
65 | #define AARPTAB_NB 19 |
66 | #define AARPTAB_SIZE (AARPTAB_BSIZ * AARPTAB_NB) |
67 | struct aarptab aarptab[AARPTAB_SIZE]; |
68 | |
69 | #define AARPTAB_HASH(a) \ |
70 | ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB ) |
71 | |
72 | #define AARPTAB_LOOK(aat,addr) { \ |
73 | int n; \ |
74 | aat = &aarptab[ AARPTAB_HASH(addr) * AARPTAB_BSIZ ]; \ |
75 | for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) \ |
76 | if ( aat->aat_ataddr.s_net == (addr).s_net && \ |
77 | aat->aat_ataddr.s_node == (addr).s_node ) \ |
78 | break; \ |
79 | if ( n >= AARPTAB_BSIZ ) \ |
80 | aat = 0; \ |
81 | } |
82 | |
83 | #define AARPT_AGE (60 * 1) |
84 | #define AARPT_KILLC 20 |
85 | #define AARPT_KILLI 3 |
86 | |
87 | const u_char atmulticastaddr[6] = { |
88 | 0x09, 0x00, 0x07, 0xff, 0xff, 0xff |
89 | }; |
90 | |
91 | const u_char at_org_code[3] = { |
92 | 0x08, 0x00, 0x07 |
93 | }; |
94 | const u_char aarp_org_code[3] = { |
95 | 0x00, 0x00, 0x00 |
96 | }; |
97 | |
98 | struct callout aarptimer_callout; |
99 | #ifdef MBUFTRACE |
100 | struct mowner aarp_mowner = MOWNER_INIT("atalk" , "arp" ); |
101 | #endif |
102 | |
103 | /*ARGSUSED*/ |
104 | static void |
105 | aarptimer(void *ignored) |
106 | { |
107 | struct aarptab *aat; |
108 | int i, s; |
109 | |
110 | mutex_enter(softnet_lock); |
111 | callout_reset(&aarptimer_callout, AARPT_AGE * hz, aarptimer, NULL); |
112 | aat = aarptab; |
113 | for (i = 0; i < AARPTAB_SIZE; i++, aat++) { |
114 | int killtime = (aat->aat_flags & ATF_COM) ? AARPT_KILLC : |
115 | AARPT_KILLI; |
116 | if (aat->aat_flags == 0 || (aat->aat_flags & ATF_PERM)) |
117 | continue; |
118 | if (++aat->aat_timer < killtime) |
119 | continue; |
120 | s = splnet(); |
121 | aarptfree(aat); |
122 | splx(s); |
123 | } |
124 | mutex_exit(softnet_lock); |
125 | } |
126 | |
127 | /* |
128 | * search through the network addresses to find one that includes the given |
129 | * network.. remember to take netranges into consideration. |
130 | */ |
131 | struct ifaddr * |
132 | at_ifawithnet(const struct sockaddr_at *sat, struct ifnet *ifp) |
133 | { |
134 | struct ifaddr *ifa; |
135 | struct sockaddr_at *sat2; |
136 | struct netrange *nr; |
137 | |
138 | IFADDR_READER_FOREACH(ifa, ifp) { |
139 | if (ifa->ifa_addr->sa_family != AF_APPLETALK) |
140 | continue; |
141 | |
142 | sat2 = satosat(ifa->ifa_addr); |
143 | if (sat2->sat_addr.s_net == sat->sat_addr.s_net) |
144 | break; |
145 | |
146 | nr = (struct netrange *) (sat2->sat_zero); |
147 | if ((nr->nr_phase == 2) |
148 | && (ntohs(nr->nr_firstnet) <= ntohs(sat->sat_addr.s_net)) |
149 | && (ntohs(nr->nr_lastnet) >= ntohs(sat->sat_addr.s_net))) |
150 | break; |
151 | } |
152 | |
153 | return ifa; |
154 | } |
155 | |
156 | static void |
157 | aarpwhohas(struct ifnet *ifp, const struct sockaddr_at *sat) |
158 | { |
159 | struct mbuf *m; |
160 | struct ether_header *eh; |
161 | struct ether_aarp *ea; |
162 | struct at_ifaddr *aa; |
163 | struct llc *llc; |
164 | struct sockaddr sa; |
165 | |
166 | if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) |
167 | return; |
168 | |
169 | MCLAIM(m, &aarp_mowner); |
170 | m->m_len = sizeof(*ea); |
171 | m->m_pkthdr.len = sizeof(*ea); |
172 | MH_ALIGN(m, sizeof(*ea)); |
173 | |
174 | ea = mtod(m, struct ether_aarp *); |
175 | memset(ea, 0, sizeof(*ea)); |
176 | |
177 | ea->aarp_hrd = htons(AARPHRD_ETHER); |
178 | ea->aarp_pro = htons(ETHERTYPE_ATALK); |
179 | ea->aarp_hln = sizeof(ea->aarp_sha); |
180 | ea->aarp_pln = sizeof(ea->aarp_spu); |
181 | ea->aarp_op = htons(AARPOP_REQUEST); |
182 | memcpy(ea->aarp_sha, CLLADDR(ifp->if_sadl), sizeof(ea->aarp_sha)); |
183 | |
184 | /* |
185 | * We need to check whether the output ethernet type should |
186 | * be phase 1 or 2. We have the interface that we'll be sending |
187 | * the aarp out. We need to find an AppleTalk network on that |
188 | * interface with the same address as we're looking for. If the |
189 | * net is phase 2, generate an 802.2 and SNAP header. |
190 | */ |
191 | if ((aa = (struct at_ifaddr *) at_ifawithnet(sat, ifp)) == NULL) { |
192 | m_freem(m); |
193 | return; |
194 | } |
195 | eh = (struct ether_header *) sa.sa_data; |
196 | |
197 | if (aa->aa_flags & AFA_PHASE2) { |
198 | memcpy(eh->ether_dhost, atmulticastaddr, |
199 | sizeof(eh->ether_dhost)); |
200 | eh->ether_type = 0; /* if_output will treat as 802 */ |
201 | M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); |
202 | if (!m) |
203 | return; |
204 | |
205 | llc = mtod(m, struct llc *); |
206 | llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; |
207 | llc->llc_control = LLC_UI; |
208 | memcpy(llc->llc_org_code, aarp_org_code, sizeof(aarp_org_code)); |
209 | llc->llc_ether_type = htons(ETHERTYPE_AARP); |
210 | |
211 | memcpy(ea->aarp_spnet, &AA_SAT(aa)->sat_addr.s_net, |
212 | sizeof(ea->aarp_spnet)); |
213 | memcpy(ea->aarp_tpnet, &sat->sat_addr.s_net, |
214 | sizeof(ea->aarp_tpnet)); |
215 | ea->aarp_spnode = AA_SAT(aa)->sat_addr.s_node; |
216 | ea->aarp_tpnode = sat->sat_addr.s_node; |
217 | } else { |
218 | memcpy(eh->ether_dhost, etherbroadcastaddr, |
219 | sizeof(eh->ether_dhost)); |
220 | eh->ether_type = htons(ETHERTYPE_AARP); |
221 | |
222 | ea->aarp_spa = AA_SAT(aa)->sat_addr.s_node; |
223 | ea->aarp_tpa = sat->sat_addr.s_node; |
224 | } |
225 | |
226 | /* If we are talking to ourselves, use the loopback interface. */ |
227 | if (AA_SAT(aa)->sat_addr.s_net == sat->sat_addr.s_net && |
228 | AA_SAT(aa)->sat_addr.s_node == sat->sat_addr.s_node) |
229 | ifp = lo0ifp; |
230 | |
231 | #ifdef NETATALKDEBUG |
232 | printf("aarp: sending request via %u.%u through %s seeking %u.%u\n" , |
233 | ntohs(AA_SAT(aa)->sat_addr.s_net), |
234 | AA_SAT(aa)->sat_addr.s_node, |
235 | ifp->if_xname, |
236 | ntohs(sat->sat_addr.s_net), |
237 | sat->sat_addr.s_node); |
238 | #endif /* NETATALKDEBUG */ |
239 | |
240 | sa.sa_len = sizeof(struct sockaddr); |
241 | sa.sa_family = AF_UNSPEC; |
242 | if_output_lock(ifp, ifp, m, &sa, NULL); /* XXX NULL should be routing */ |
243 | /* information */ |
244 | } |
245 | |
246 | int |
247 | aarpresolve(struct ifnet *ifp, struct mbuf *m, |
248 | const struct sockaddr_at *destsat, u_char *desten) |
249 | { |
250 | struct at_ifaddr *aa; |
251 | struct aarptab *aat; |
252 | int s; |
253 | |
254 | if (at_broadcast(destsat)) { |
255 | struct ifaddr *ifa; |
256 | |
257 | s = pserialize_read_enter(); |
258 | ifa = at_ifawithnet(destsat, ifp); |
259 | if (ifa == NULL) { |
260 | pserialize_read_exit(s); |
261 | m_freem(m); |
262 | return (0); |
263 | } |
264 | aa = (struct at_ifaddr *)ifa; |
265 | |
266 | if (aa->aa_flags & AFA_PHASE2) |
267 | memcpy(desten, atmulticastaddr, |
268 | sizeof(atmulticastaddr)); |
269 | else |
270 | memcpy(desten, etherbroadcastaddr, |
271 | sizeof(etherbroadcastaddr)); |
272 | pserialize_read_exit(s); |
273 | return 1; |
274 | } |
275 | s = splnet(); |
276 | AARPTAB_LOOK(aat, destsat->sat_addr); |
277 | if (aat == 0) { /* No entry */ |
278 | aat = aarptnew(&destsat->sat_addr); |
279 | if (aat == 0) |
280 | panic("aarpresolve: no free entry" ); |
281 | |
282 | aat->aat_hold = m; |
283 | aarpwhohas(ifp, destsat); |
284 | splx(s); |
285 | return 0; |
286 | } |
287 | |
288 | /* found an entry */ |
289 | aat->aat_timer = 0; |
290 | if (aat->aat_flags & ATF_COM) { /* entry is COMplete */ |
291 | memcpy(desten, aat->aat_enaddr, sizeof(aat->aat_enaddr)); |
292 | splx(s); |
293 | return 1; |
294 | } |
295 | |
296 | /* entry has not completed */ |
297 | if (aat->aat_hold) |
298 | m_freem(aat->aat_hold); |
299 | aat->aat_hold = m; |
300 | aarpwhohas(ifp, destsat); |
301 | splx(s); |
302 | |
303 | return 0; |
304 | } |
305 | |
306 | void |
307 | aarpinput(struct ifnet *ifp, struct mbuf *m) |
308 | { |
309 | struct arphdr *ar; |
310 | |
311 | if (ifp->if_flags & IFF_NOARP) |
312 | goto out; |
313 | |
314 | if (m->m_len < sizeof(struct arphdr)) |
315 | goto out; |
316 | |
317 | ar = mtod(m, struct arphdr *); |
318 | if (ntohs(ar->ar_hrd) != AARPHRD_ETHER) |
319 | goto out; |
320 | |
321 | if (m->m_len < sizeof(struct arphdr) + 2 * ar->ar_hln + 2 * ar->ar_pln) |
322 | goto out; |
323 | |
324 | switch (ntohs(ar->ar_pro)) { |
325 | case ETHERTYPE_ATALK: |
326 | at_aarpinput(ifp, m); |
327 | return; |
328 | |
329 | default: |
330 | break; |
331 | } |
332 | |
333 | out: |
334 | m_freem(m); |
335 | } |
336 | |
337 | static void |
338 | at_aarpinput(struct ifnet *ifp, struct mbuf *m) |
339 | { |
340 | struct ether_aarp *ea; |
341 | struct at_ifaddr *aa; |
342 | struct aarptab *aat; |
343 | struct ether_header *eh; |
344 | struct llc *llc; |
345 | struct sockaddr_at sat; |
346 | struct sockaddr sa; |
347 | struct at_addr spa, tpa, ma; |
348 | int op; |
349 | u_int16_t net; |
350 | int s; |
351 | struct psref psref; |
352 | struct ifaddr *ifa; |
353 | |
354 | ea = mtod(m, struct ether_aarp *); |
355 | |
356 | /* Check to see if from my hardware address */ |
357 | if (!memcmp(ea->aarp_sha, CLLADDR(ifp->if_sadl), sizeof(ea->aarp_sha))) { |
358 | m_freem(m); |
359 | return; |
360 | } |
361 | op = ntohs(ea->aarp_op); |
362 | memcpy(&net, ea->aarp_tpnet, sizeof(net)); |
363 | |
364 | if (net != 0) { /* should be ATADDR_ANYNET? */ |
365 | sat.sat_len = sizeof(struct sockaddr_at); |
366 | sat.sat_family = AF_APPLETALK; |
367 | sat.sat_addr.s_net = net; |
368 | |
369 | s = pserialize_read_enter(); |
370 | ifa = at_ifawithnet(&sat, ifp); |
371 | if (ifa == NULL) { |
372 | pserialize_read_exit(s); |
373 | m_freem(m); |
374 | return; |
375 | } |
376 | ifa_acquire(ifa, &psref); |
377 | pserialize_read_exit(s); |
378 | aa = (struct at_ifaddr *)ifa; |
379 | |
380 | memcpy(&spa.s_net, ea->aarp_spnet, sizeof(spa.s_net)); |
381 | memcpy(&tpa.s_net, ea->aarp_tpnet, sizeof(tpa.s_net)); |
382 | } else { |
383 | /* |
384 | * Since we don't know the net, we just look for the first |
385 | * phase 1 address on the interface. |
386 | */ |
387 | s = pserialize_read_enter(); |
388 | IFADDR_READER_FOREACH(ifa, ifp) { |
389 | aa = (struct at_ifaddr *)ifa; |
390 | if (AA_SAT(aa)->sat_family == AF_APPLETALK && |
391 | (aa->aa_flags & AFA_PHASE2) == 0) { |
392 | ifa_acquire(ifa, &psref); |
393 | break; |
394 | } |
395 | } |
396 | pserialize_read_exit(s); |
397 | |
398 | if (ifa == NULL) { |
399 | m_freem(m); |
400 | return; |
401 | } |
402 | tpa.s_net = spa.s_net = AA_SAT(aa)->sat_addr.s_net; |
403 | } |
404 | |
405 | spa.s_node = ea->aarp_spnode; |
406 | tpa.s_node = ea->aarp_tpnode; |
407 | ma.s_net = AA_SAT(aa)->sat_addr.s_net; |
408 | ma.s_node = AA_SAT(aa)->sat_addr.s_node; |
409 | |
410 | /* |
411 | * This looks like it's from us. |
412 | */ |
413 | if (spa.s_net == ma.s_net && spa.s_node == ma.s_node) { |
414 | if (aa->aa_flags & AFA_PROBING) { |
415 | /* |
416 | * We're probing, someone either responded to our |
417 | * probe, or probed for the same address we'd like |
418 | * to use. Change the address we're probing for. |
419 | */ |
420 | callout_stop(&aa->aa_probe_ch); |
421 | wakeup(aa); |
422 | m_freem(m); |
423 | goto out; |
424 | } else if (op != AARPOP_PROBE) { |
425 | /* |
426 | * This is not a probe, and we're not probing. |
427 | * This means that someone's saying they have the same |
428 | * source address as the one we're using. Get upset... |
429 | */ |
430 | log(LOG_ERR, "aarp: duplicate AT address!! %s\n" , |
431 | ether_sprintf(ea->aarp_sha)); |
432 | m_freem(m); |
433 | goto out; |
434 | } |
435 | } |
436 | AARPTAB_LOOK(aat, spa); |
437 | if (aat) { |
438 | if (op == AARPOP_PROBE) { |
439 | /* |
440 | * Someone's probing for spa, deallocate the one we've |
441 | * got, so that if the prober keeps the address, we'll |
442 | * be able to arp for him. |
443 | */ |
444 | aarptfree(aat); |
445 | m_freem(m); |
446 | goto out; |
447 | } |
448 | memcpy(aat->aat_enaddr, ea->aarp_sha, sizeof(ea->aarp_sha)); |
449 | aat->aat_flags |= ATF_COM; |
450 | if (aat->aat_hold) { |
451 | sat.sat_len = sizeof(struct sockaddr_at); |
452 | sat.sat_family = AF_APPLETALK; |
453 | sat.sat_addr = spa; |
454 | if_output_lock(ifp, ifp, aat->aat_hold, |
455 | (struct sockaddr *) & sat, NULL); /* XXX */ |
456 | aat->aat_hold = 0; |
457 | } |
458 | } |
459 | if (aat == 0 && tpa.s_net == ma.s_net && tpa.s_node == ma.s_node |
460 | && op != AARPOP_PROBE) { |
461 | if ((aat = aarptnew(&spa)) != NULL) { |
462 | memcpy(aat->aat_enaddr, ea->aarp_sha, |
463 | sizeof(ea->aarp_sha)); |
464 | aat->aat_flags |= ATF_COM; |
465 | } |
466 | } |
467 | /* |
468 | * Don't respond to responses, and never respond if we're |
469 | * still probing. |
470 | */ |
471 | if (tpa.s_net != ma.s_net || tpa.s_node != ma.s_node || |
472 | op == AARPOP_RESPONSE || (aa->aa_flags & AFA_PROBING)) { |
473 | m_freem(m); |
474 | goto out; |
475 | } |
476 | |
477 | /* |
478 | * Prepare and send AARP-response. |
479 | */ |
480 | m->m_len = sizeof(*ea); |
481 | m->m_pkthdr.len = sizeof(*ea); |
482 | memcpy(ea->aarp_tha, ea->aarp_sha, sizeof(ea->aarp_sha)); |
483 | memcpy(ea->aarp_sha, CLLADDR(ifp->if_sadl), sizeof(ea->aarp_sha)); |
484 | |
485 | /* XXX */ |
486 | eh = (struct ether_header *) sa.sa_data; |
487 | memcpy(eh->ether_dhost, ea->aarp_tha, sizeof(eh->ether_dhost)); |
488 | |
489 | if (aa->aa_flags & AFA_PHASE2) { |
490 | M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); |
491 | if (m == NULL) |
492 | goto out; |
493 | |
494 | llc = mtod(m, struct llc *); |
495 | llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; |
496 | llc->llc_control = LLC_UI; |
497 | memcpy(llc->llc_org_code, aarp_org_code, sizeof(aarp_org_code)); |
498 | llc->llc_ether_type = htons(ETHERTYPE_AARP); |
499 | |
500 | memcpy(ea->aarp_tpnet, ea->aarp_spnet, sizeof(ea->aarp_tpnet)); |
501 | memcpy(ea->aarp_spnet, &ma.s_net, sizeof(ea->aarp_spnet)); |
502 | eh->ether_type = 0; /* if_output will treat as 802 */ |
503 | } else { |
504 | eh->ether_type = htons(ETHERTYPE_AARP); |
505 | } |
506 | |
507 | ea->aarp_tpnode = ea->aarp_spnode; |
508 | ea->aarp_spnode = ma.s_node; |
509 | ea->aarp_op = htons(AARPOP_RESPONSE); |
510 | |
511 | sa.sa_len = sizeof(struct sockaddr); |
512 | sa.sa_family = AF_UNSPEC; |
513 | (*ifp->if_output) (ifp, m, &sa, NULL); /* XXX */ |
514 | out: |
515 | ifa_release(ifa, &psref); |
516 | return; |
517 | } |
518 | |
519 | static void |
520 | aarptfree(struct aarptab *aat) |
521 | { |
522 | |
523 | if (aat->aat_hold) |
524 | m_freem(aat->aat_hold); |
525 | aat->aat_hold = 0; |
526 | aat->aat_timer = aat->aat_flags = 0; |
527 | aat->aat_ataddr.s_net = 0; |
528 | aat->aat_ataddr.s_node = 0; |
529 | } |
530 | |
531 | static struct aarptab * |
532 | aarptnew(const struct at_addr *addr) |
533 | { |
534 | int n; |
535 | int oldest = -1; |
536 | struct aarptab *aat, *aato = NULL; |
537 | static int first = 1; |
538 | |
539 | if (first) { |
540 | first = 0; |
541 | callout_init(&aarptimer_callout, 0); |
542 | callout_reset(&aarptimer_callout, hz, aarptimer, NULL); |
543 | } |
544 | aat = &aarptab[AARPTAB_HASH(*addr) * AARPTAB_BSIZ]; |
545 | for (n = 0; n < AARPTAB_BSIZ; n++, aat++) { |
546 | if (aat->aat_flags == 0) |
547 | goto out; |
548 | if (aat->aat_flags & ATF_PERM) |
549 | continue; |
550 | if ((int) aat->aat_timer > oldest) { |
551 | oldest = aat->aat_timer; |
552 | aato = aat; |
553 | } |
554 | } |
555 | if (aato == NULL) |
556 | return (NULL); |
557 | aat = aato; |
558 | aarptfree(aat); |
559 | out: |
560 | aat->aat_ataddr = *addr; |
561 | aat->aat_flags = ATF_INUSE; |
562 | return (aat); |
563 | } |
564 | |
565 | |
566 | void |
567 | aarpprobe(void *arp) |
568 | { |
569 | struct mbuf *m; |
570 | struct ether_header *eh; |
571 | struct ether_aarp *ea; |
572 | struct ifaddr *ia; |
573 | struct at_ifaddr *aa; |
574 | struct llc *llc; |
575 | struct sockaddr sa; |
576 | struct ifnet *ifp = arp; |
577 | |
578 | mutex_enter(softnet_lock); |
579 | |
580 | /* |
581 | * We need to check whether the output ethernet type should |
582 | * be phase 1 or 2. We have the interface that we'll be sending |
583 | * the aarp out. We need to find an AppleTalk network on that |
584 | * interface with the same address as we're looking for. If the |
585 | * net is phase 2, generate an 802.2 and SNAP header. |
586 | */ |
587 | IFADDR_READER_FOREACH(ia, ifp) { |
588 | aa = (struct at_ifaddr *)ia; |
589 | if (AA_SAT(aa)->sat_family == AF_APPLETALK && |
590 | (aa->aa_flags & AFA_PROBING)) |
591 | break; |
592 | } |
593 | if (ia == NULL) { /* serious error XXX */ |
594 | printf("aarpprobe why did this happen?!\n" ); |
595 | mutex_exit(softnet_lock); |
596 | return; |
597 | } |
598 | if (aa->aa_probcnt <= 0) { |
599 | aa->aa_flags &= ~AFA_PROBING; |
600 | wakeup(aa); |
601 | mutex_exit(softnet_lock); |
602 | return; |
603 | } else { |
604 | callout_reset(&aa->aa_probe_ch, hz / 5, aarpprobe, arp); |
605 | } |
606 | |
607 | if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) { |
608 | mutex_exit(softnet_lock); |
609 | return; |
610 | } |
611 | |
612 | MCLAIM(m, &aarp_mowner); |
613 | m->m_len = sizeof(*ea); |
614 | m->m_pkthdr.len = sizeof(*ea); |
615 | MH_ALIGN(m, sizeof(*ea)); |
616 | |
617 | ea = mtod(m, struct ether_aarp *); |
618 | memset(ea, 0, sizeof(*ea)); |
619 | |
620 | ea->aarp_hrd = htons(AARPHRD_ETHER); |
621 | ea->aarp_pro = htons(ETHERTYPE_ATALK); |
622 | ea->aarp_hln = sizeof(ea->aarp_sha); |
623 | ea->aarp_pln = sizeof(ea->aarp_spu); |
624 | ea->aarp_op = htons(AARPOP_PROBE); |
625 | memcpy(ea->aarp_sha, CLLADDR(ifp->if_sadl), sizeof(ea->aarp_sha)); |
626 | |
627 | eh = (struct ether_header *) sa.sa_data; |
628 | |
629 | if (aa->aa_flags & AFA_PHASE2) { |
630 | memcpy(eh->ether_dhost, atmulticastaddr, |
631 | sizeof(eh->ether_dhost)); |
632 | eh->ether_type = 0; /* if_output will treat as 802 */ |
633 | M_PREPEND(m, sizeof(struct llc), M_DONTWAIT); |
634 | if (!m) { |
635 | mutex_exit(softnet_lock); |
636 | return; |
637 | } |
638 | |
639 | llc = mtod(m, struct llc *); |
640 | llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; |
641 | llc->llc_control = LLC_UI; |
642 | memcpy(llc->llc_org_code, aarp_org_code, sizeof(aarp_org_code)); |
643 | llc->llc_ether_type = htons(ETHERTYPE_AARP); |
644 | |
645 | memcpy(ea->aarp_spnet, &AA_SAT(aa)->sat_addr.s_net, |
646 | sizeof(ea->aarp_spnet)); |
647 | memcpy(ea->aarp_tpnet, &AA_SAT(aa)->sat_addr.s_net, |
648 | sizeof(ea->aarp_tpnet)); |
649 | ea->aarp_spnode = ea->aarp_tpnode = |
650 | AA_SAT(aa)->sat_addr.s_node; |
651 | } else { |
652 | memcpy(eh->ether_dhost, etherbroadcastaddr, |
653 | sizeof(eh->ether_dhost)); |
654 | eh->ether_type = htons(ETHERTYPE_AARP); |
655 | ea->aarp_spa = ea->aarp_tpa = AA_SAT(aa)->sat_addr.s_node; |
656 | } |
657 | |
658 | #ifdef NETATALKDEBUG |
659 | printf("aarp: sending probe for %u.%u\n" , |
660 | ntohs(AA_SAT(aa)->sat_addr.s_net), |
661 | AA_SAT(aa)->sat_addr.s_node); |
662 | #endif /* NETATALKDEBUG */ |
663 | |
664 | sa.sa_len = sizeof(struct sockaddr); |
665 | sa.sa_family = AF_UNSPEC; |
666 | (*ifp->if_output) (ifp, m, &sa, NULL); /* XXX */ |
667 | aa->aa_probcnt--; |
668 | mutex_exit(softnet_lock); |
669 | } |
670 | |
671 | void |
672 | aarp_clean(void) |
673 | { |
674 | struct aarptab *aat; |
675 | int i; |
676 | |
677 | callout_stop(&aarptimer_callout); |
678 | for (i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++) |
679 | if (aat->aat_hold) |
680 | m_freem(aat->aat_hold); |
681 | } |
682 | |