FreeBSD/Linux Kernel Cross Reference
sys/net/if_arcsubr.c
1 /* $NetBSD: if_arcsubr.c,v 1.36 2001/06/14 05:44:23 itojun Exp $ */
2 /* $FreeBSD: releng/6.1/sys/net/if_arcsubr.c 149443 2005-08-25 05:01:24Z rwatson $ */
3
4 /*-
5 * Copyright (c) 1994, 1995 Ignatios Souvatzis
6 * Copyright (c) 1982, 1989, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: NetBSD: if_ethersubr.c,v 1.9 1994/06/29 06:36:11 cgd Exp
38 * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
39 *
40 */
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43 #include "opt_ipx.h"
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/module.h>
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51 #include <sys/protosw.h>
52 #include <sys/socket.h>
53 #include <sys/sockio.h>
54 #include <sys/errno.h>
55 #include <sys/syslog.h>
56
57 #include <machine/cpu.h>
58
59 #include <net/if.h>
60 #include <net/netisr.h>
61 #include <net/route.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_arc.h>
65 #include <net/if_arp.h>
66 #include <net/bpf.h>
67
68 #if defined(INET) || defined(INET6)
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/if_ether.h>
72 #endif
73
74 #ifdef INET6
75 #include <netinet6/nd6.h>
76 #endif
77
78 #ifdef IPX
79 #include <netipx/ipx.h>
80 #include <netipx/ipx_if.h>
81 #endif
82
83 #define ARCNET_ALLOW_BROKEN_ARP
84
85 static struct mbuf *arc_defrag(struct ifnet *, struct mbuf *);
86 static int arc_resolvemulti(struct ifnet *, struct sockaddr **,
87 struct sockaddr *);
88
89 u_int8_t arcbroadcastaddr = 0;
90
91 #define ARC_LLADDR(ifp) (*(u_int8_t *)IF_LLADDR(ifp))
92
93 #define senderr(e) { error = (e); goto bad;}
94 #define SIN(s) ((struct sockaddr_in *)s)
95 #define SIPX(s) ((struct sockaddr_ipx *)s)
96
97 /*
98 * ARCnet output routine.
99 * Encapsulate a packet of type family for the local net.
100 * Assumes that ifp is actually pointer to arccom structure.
101 */
102 int
103 arc_output(ifp, m, dst, rt0)
104 struct ifnet *ifp;
105 struct mbuf *m;
106 struct sockaddr *dst;
107 struct rtentry *rt0;
108 {
109 struct arc_header *ah;
110 int error;
111 u_int8_t atype, adst;
112 int loop_copy = 0;
113 int isphds;
114
115 if (!((ifp->if_flags & IFF_UP) &&
116 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
117 return(ENETDOWN); /* m, m1 aren't initialized yet */
118
119 error = 0;
120
121 switch (dst->sa_family) {
122 #ifdef INET
123 case AF_INET:
124
125 /*
126 * For now, use the simple IP addr -> ARCnet addr mapping
127 */
128 if (m->m_flags & (M_BCAST|M_MCAST))
129 adst = arcbroadcastaddr; /* ARCnet broadcast address */
130 else if (ifp->if_flags & IFF_NOARP)
131 adst = ntohl(SIN(dst)->sin_addr.s_addr) & 0xFF;
132 else {
133 error = arpresolve(ifp, rt0, m, dst, &adst);
134 if (error)
135 return (error == EWOULDBLOCK ? 0 : error);
136 }
137
138 atype = (ifp->if_flags & IFF_LINK0) ?
139 ARCTYPE_IP_OLD : ARCTYPE_IP;
140 break;
141 case AF_ARP:
142 {
143 struct arphdr *ah;
144 ah = mtod(m, struct arphdr *);
145 ah->ar_hrd = htons(ARPHRD_ARCNET);
146
147 loop_copy = -1; /* if this is for us, don't do it */
148
149 switch(ntohs(ah->ar_op)) {
150 case ARPOP_REVREQUEST:
151 case ARPOP_REVREPLY:
152 atype = ARCTYPE_REVARP;
153 break;
154 case ARPOP_REQUEST:
155 case ARPOP_REPLY:
156 default:
157 atype = ARCTYPE_ARP;
158 break;
159 }
160
161 if (m->m_flags & M_BCAST)
162 bcopy(ifp->if_broadcastaddr, &adst, ARC_ADDR_LEN);
163 else
164 bcopy(ar_tha(ah), &adst, ARC_ADDR_LEN);
165
166 }
167 break;
168 #endif
169 #ifdef INET6
170 case AF_INET6:
171 error = nd6_storelladdr(ifp, rt0, m, dst, (u_char *)&adst);
172 if (error)
173 return (error);
174 atype = ARCTYPE_INET6;
175 break;
176 #endif
177 #ifdef IPX
178 case AF_IPX:
179 adst = SIPX(dst)->sipx_addr.x_host.c_host[5];
180 atype = ARCTYPE_IPX;
181 if (adst == 0xff)
182 adst = arcbroadcastaddr;
183 break;
184 #endif
185
186 case AF_UNSPEC:
187 loop_copy = -1;
188 ah = (struct arc_header *)dst->sa_data;
189 adst = ah->arc_dhost;
190 atype = ah->arc_type;
191
192 if (atype == ARCTYPE_ARP) {
193 atype = (ifp->if_flags & IFF_LINK0) ?
194 ARCTYPE_ARP_OLD: ARCTYPE_ARP;
195
196 #ifdef ARCNET_ALLOW_BROKEN_ARP
197 /*
198 * XXX It's not clear per RFC826 if this is needed, but
199 * "assigned numbers" say this is wrong.
200 * However, e.g., AmiTCP 3.0Beta used it... we make this
201 * switchable for emergency cases. Not perfect, but...
202 */
203 if (ifp->if_flags & IFF_LINK2)
204 mtod(m, struct arphdr *)->ar_pro = atype - 1;
205 #endif
206 }
207 break;
208
209 default:
210 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
211 senderr(EAFNOSUPPORT);
212 }
213
214 isphds = arc_isphds(atype);
215 M_PREPEND(m, isphds ? ARC_HDRNEWLEN : ARC_HDRLEN, M_DONTWAIT);
216 if (m == 0)
217 senderr(ENOBUFS);
218 ah = mtod(m, struct arc_header *);
219 ah->arc_type = atype;
220 ah->arc_dhost = adst;
221 ah->arc_shost = ARC_LLADDR(ifp);
222 if (isphds) {
223 ah->arc_flag = 0;
224 ah->arc_seqid = 0;
225 }
226
227 if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
228 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
229 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
230
231 (void) if_simloop(ifp, n, dst->sa_family, ARC_HDRLEN);
232 } else if (ah->arc_dhost == ah->arc_shost) {
233 (void) if_simloop(ifp, m, dst->sa_family, ARC_HDRLEN);
234 return (0); /* XXX */
235 }
236 }
237
238 BPF_MTAP(ifp, m);
239
240 IFQ_HANDOFF(ifp, m, error);
241
242 return (error);
243
244 bad:
245 if (m)
246 m_freem(m);
247 return (error);
248 }
249
250 void
251 arc_frag_init(ifp)
252 struct ifnet *ifp;
253 {
254 struct arccom *ac;
255
256 ac = (struct arccom *)ifp->if_l2com;
257 ac->curr_frag = 0;
258 }
259
260 struct mbuf *
261 arc_frag_next(ifp)
262 struct ifnet *ifp;
263 {
264 struct arccom *ac;
265 struct mbuf *m;
266 struct arc_header *ah;
267
268 ac = (struct arccom *)ifp->if_l2com;
269 if ((m = ac->curr_frag) == 0) {
270 int tfrags;
271
272 /* dequeue new packet */
273 IF_DEQUEUE(&ifp->if_snd, m);
274 if (m == 0)
275 return 0;
276
277 ah = mtod(m, struct arc_header *);
278 if (!arc_isphds(ah->arc_type))
279 return m;
280
281 ++ac->ac_seqid; /* make the seqid unique */
282 tfrags = (m->m_pkthdr.len + ARC_MAX_DATA - 1) / ARC_MAX_DATA;
283 ac->fsflag = 2 * tfrags - 3;
284 ac->sflag = 0;
285 ac->rsflag = ac->fsflag;
286 ac->arc_dhost = ah->arc_dhost;
287 ac->arc_shost = ah->arc_shost;
288 ac->arc_type = ah->arc_type;
289
290 m_adj(m, ARC_HDRNEWLEN);
291 ac->curr_frag = m;
292 }
293
294 /* split out next fragment and return it */
295 if (ac->sflag < ac->fsflag) {
296 /* we CAN'T have short packets here */
297 ac->curr_frag = m_split(m, ARC_MAX_DATA, M_DONTWAIT);
298 if (ac->curr_frag == 0) {
299 m_freem(m);
300 return 0;
301 }
302
303 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
304 if (m == 0) {
305 m_freem(ac->curr_frag);
306 ac->curr_frag = 0;
307 return 0;
308 }
309
310 ah = mtod(m, struct arc_header *);
311 ah->arc_flag = ac->rsflag;
312 ah->arc_seqid = ac->ac_seqid;
313
314 ac->sflag += 2;
315 ac->rsflag = ac->sflag;
316 } else if ((m->m_pkthdr.len >=
317 ARC_MIN_FORBID_LEN - ARC_HDRNEWLEN + 2) &&
318 (m->m_pkthdr.len <=
319 ARC_MAX_FORBID_LEN - ARC_HDRNEWLEN + 2)) {
320 ac->curr_frag = 0;
321
322 M_PREPEND(m, ARC_HDRNEWLEN_EXC, M_DONTWAIT);
323 if (m == 0)
324 return 0;
325
326 ah = mtod(m, struct arc_header *);
327 ah->arc_flag = 0xFF;
328 ah->arc_seqid = 0xFFFF;
329 ah->arc_type2 = ac->arc_type;
330 ah->arc_flag2 = ac->sflag;
331 ah->arc_seqid2 = ac->ac_seqid;
332 } else {
333 ac->curr_frag = 0;
334
335 M_PREPEND(m, ARC_HDRNEWLEN, M_DONTWAIT);
336 if (m == 0)
337 return 0;
338
339 ah = mtod(m, struct arc_header *);
340 ah->arc_flag = ac->sflag;
341 ah->arc_seqid = ac->ac_seqid;
342 }
343
344 ah->arc_dhost = ac->arc_dhost;
345 ah->arc_shost = ac->arc_shost;
346 ah->arc_type = ac->arc_type;
347
348 return m;
349 }
350
351 /*
352 * Defragmenter. Returns mbuf if last packet found, else
353 * NULL. frees imcoming mbuf as necessary.
354 */
355
356 static __inline struct mbuf *
357 arc_defrag(ifp, m)
358 struct ifnet *ifp;
359 struct mbuf *m;
360 {
361 struct arc_header *ah, *ah1;
362 struct arccom *ac;
363 struct ac_frag *af;
364 struct mbuf *m1;
365 char *s;
366 int newflen;
367 u_char src,dst,typ;
368
369 ac = (struct arccom *)ifp->if_l2com;
370
371 if (m->m_len < ARC_HDRNEWLEN) {
372 m = m_pullup(m, ARC_HDRNEWLEN);
373 if (m == NULL) {
374 ++ifp->if_ierrors;
375 return NULL;
376 }
377 }
378
379 ah = mtod(m, struct arc_header *);
380 typ = ah->arc_type;
381
382 if (!arc_isphds(typ))
383 return m;
384
385 src = ah->arc_shost;
386 dst = ah->arc_dhost;
387
388 if (ah->arc_flag == 0xff) {
389 m_adj(m, 4);
390
391 if (m->m_len < ARC_HDRNEWLEN) {
392 m = m_pullup(m, ARC_HDRNEWLEN);
393 if (m == NULL) {
394 ++ifp->if_ierrors;
395 return NULL;
396 }
397 }
398
399 ah = mtod(m, struct arc_header *);
400 }
401
402 af = &ac->ac_fragtab[src];
403 m1 = af->af_packet;
404 s = "debug code error";
405
406 if (ah->arc_flag & 1) {
407 /*
408 * first fragment. We always initialize, which is
409 * about the right thing to do, as we only want to
410 * accept one fragmented packet per src at a time.
411 */
412 if (m1 != NULL)
413 m_freem(m1);
414
415 af->af_packet = m;
416 m1 = m;
417 af->af_maxflag = ah->arc_flag;
418 af->af_lastseen = 0;
419 af->af_seqid = ah->arc_seqid;
420
421 return NULL;
422 /* notreached */
423 } else {
424 /* check for unfragmented packet */
425 if (ah->arc_flag == 0)
426 return m;
427
428 /* do we have a first packet from that src? */
429 if (m1 == NULL) {
430 s = "no first frag";
431 goto outofseq;
432 }
433
434 ah1 = mtod(m1, struct arc_header *);
435
436 if (ah->arc_seqid != ah1->arc_seqid) {
437 s = "seqid differs";
438 goto outofseq;
439 }
440
441 if (typ != ah1->arc_type) {
442 s = "type differs";
443 goto outofseq;
444 }
445
446 if (dst != ah1->arc_dhost) {
447 s = "dest host differs";
448 goto outofseq;
449 }
450
451 /* typ, seqid and dst are ok here. */
452
453 if (ah->arc_flag == af->af_lastseen) {
454 m_freem(m);
455 return NULL;
456 }
457
458 if (ah->arc_flag == af->af_lastseen + 2) {
459 /* ok, this is next fragment */
460 af->af_lastseen = ah->arc_flag;
461 m_adj(m,ARC_HDRNEWLEN);
462
463 /*
464 * m_cat might free the first mbuf (with pkthdr)
465 * in 2nd chain; therefore:
466 */
467
468 newflen = m->m_pkthdr.len;
469
470 m_cat(m1,m);
471
472 m1->m_pkthdr.len += newflen;
473
474 /* is it the last one? */
475 if (af->af_lastseen > af->af_maxflag) {
476 af->af_packet = NULL;
477 return(m1);
478 } else
479 return NULL;
480 }
481 s = "other reason";
482 /* if all else fails, it is out of sequence, too */
483 }
484 outofseq:
485 if (m1) {
486 m_freem(m1);
487 af->af_packet = NULL;
488 }
489
490 if (m)
491 m_freem(m);
492
493 log(LOG_INFO,"%s: got out of seq. packet: %s\n",
494 ifp->if_xname, s);
495
496 return NULL;
497 }
498
499 /*
500 * return 1 if Packet Header Definition Standard, else 0.
501 * For now: old IP, old ARP aren't obviously. Lacking correct information,
502 * we guess that besides new IP and new ARP also IPX and APPLETALK are PHDS.
503 * (Apple and Novell corporations were involved, among others, in PHDS work).
504 * Easiest is to assume that everybody else uses that, too.
505 */
506 int
507 arc_isphds(type)
508 u_int8_t type;
509 {
510 return (type != ARCTYPE_IP_OLD &&
511 type != ARCTYPE_ARP_OLD &&
512 type != ARCTYPE_DIAGNOSE);
513 }
514
515 /*
516 * Process a received Arcnet packet;
517 * the packet is in the mbuf chain m with
518 * the ARCnet header.
519 */
520 void
521 arc_input(ifp, m)
522 struct ifnet *ifp;
523 struct mbuf *m;
524 {
525 struct arc_header *ah;
526 int isr;
527 u_int8_t atype;
528
529 if ((ifp->if_flags & IFF_UP) == 0) {
530 m_freem(m);
531 return;
532 }
533
534 /* possibly defragment: */
535 m = arc_defrag(ifp, m);
536 if (m == NULL)
537 return;
538
539 BPF_MTAP(ifp, m);
540
541 ah = mtod(m, struct arc_header *);
542 /* does this belong to us? */
543 if ((ifp->if_flags & IFF_PROMISC) == 0
544 && ah->arc_dhost != arcbroadcastaddr
545 && ah->arc_dhost != ARC_LLADDR(ifp)) {
546 m_freem(m);
547 return;
548 }
549
550 ifp->if_ibytes += m->m_pkthdr.len;
551
552 if (ah->arc_dhost == arcbroadcastaddr) {
553 m->m_flags |= M_BCAST|M_MCAST;
554 ifp->if_imcasts++;
555 }
556
557 atype = ah->arc_type;
558 switch (atype) {
559 #ifdef INET
560 case ARCTYPE_IP:
561 m_adj(m, ARC_HDRNEWLEN);
562 if (ip_fastforward(m))
563 return;
564 isr = NETISR_IP;
565 break;
566
567 case ARCTYPE_IP_OLD:
568 m_adj(m, ARC_HDRLEN);
569 if (ip_fastforward(m))
570 return;
571 isr = NETISR_IP;
572 break;
573
574 case ARCTYPE_ARP:
575 if (ifp->if_flags & IFF_NOARP) {
576 /* Discard packet if ARP is disabled on interface */
577 m_freem(m);
578 return;
579 }
580 m_adj(m, ARC_HDRNEWLEN);
581 isr = NETISR_ARP;
582 #ifdef ARCNET_ALLOW_BROKEN_ARP
583 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
584 #endif
585 break;
586
587 case ARCTYPE_ARP_OLD:
588 if (ifp->if_flags & IFF_NOARP) {
589 /* Discard packet if ARP is disabled on interface */
590 m_freem(m);
591 return;
592 }
593 m_adj(m, ARC_HDRLEN);
594 isr = NETISR_ARP;
595 #ifdef ARCNET_ALLOW_BROKEN_ARP
596 mtod(m, struct arphdr *)->ar_pro = htons(ETHERTYPE_IP);
597 #endif
598 break;
599 #endif
600 #ifdef INET6
601 case ARCTYPE_INET6:
602 m_adj(m, ARC_HDRNEWLEN);
603 isr = NETISR_IPV6;
604 break;
605 #endif
606 #ifdef IPX
607 case ARCTYPE_IPX:
608 m_adj(m, ARC_HDRNEWLEN);
609 isr = NETISR_IPX;
610 break;
611 #endif
612 default:
613 m_freem(m);
614 return;
615 }
616 netisr_dispatch(isr, m);
617 }
618
619 /*
620 * Register (new) link level address.
621 */
622 void
623 arc_storelladdr(ifp, lla)
624 struct ifnet *ifp;
625 u_int8_t lla;
626 {
627 ARC_LLADDR(ifp) = lla;
628 }
629
630 /*
631 * Perform common duties while attaching to interface list
632 */
633 void
634 arc_ifattach(ifp, lla)
635 struct ifnet *ifp;
636 u_int8_t lla;
637 {
638 struct ifaddr *ifa;
639 struct sockaddr_dl *sdl;
640 struct arccom *ac;
641
642 if_attach(ifp);
643 ifp->if_addrlen = 1;
644 ifp->if_hdrlen = ARC_HDRLEN;
645 ifp->if_mtu = 1500;
646 ifp->if_resolvemulti = arc_resolvemulti;
647 if (ifp->if_baudrate == 0)
648 ifp->if_baudrate = 2500000;
649 #if __FreeBSD_version < 500000
650 ifa = ifnet_addrs[ifp->if_index - 1];
651 #else
652 ifa = ifaddr_byindex(ifp->if_index);
653 #endif
654 KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
655 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
656 sdl->sdl_type = IFT_ARCNET;
657 sdl->sdl_alen = ifp->if_addrlen;
658
659 if (ifp->if_flags & IFF_BROADCAST)
660 ifp->if_flags |= IFF_MULTICAST|IFF_ALLMULTI;
661
662 ac = (struct arccom *)ifp->if_l2com;
663 ac->ac_seqid = (time_second) & 0xFFFF; /* try to make seqid unique */
664 if (lla == 0) {
665 /* XXX this message isn't entirely clear, to me -- cgd */
666 log(LOG_ERR,"%s: link address 0 reserved for broadcasts. Please change it and ifconfig %s down up\n",
667 ifp->if_xname, ifp->if_xname);
668 }
669 arc_storelladdr(ifp, lla);
670
671 ifp->if_broadcastaddr = &arcbroadcastaddr;
672
673 bpfattach(ifp, DLT_ARCNET, ARC_HDRLEN);
674 }
675
676 void
677 arc_ifdetach(ifp)
678 struct ifnet *ifp;
679 {
680 bpfdetach(ifp);
681 if_detach(ifp);
682 }
683
684 int
685 arc_ioctl(ifp, command, data)
686 struct ifnet *ifp;
687 int command;
688 caddr_t data;
689 {
690 struct ifaddr *ifa = (struct ifaddr *) data;
691 struct ifreq *ifr = (struct ifreq *) data;
692 int error = 0;
693
694 switch (command) {
695 case SIOCSIFADDR:
696 ifp->if_flags |= IFF_UP;
697 switch (ifa->ifa_addr->sa_family) {
698 #ifdef INET
699 case AF_INET:
700 ifp->if_init(ifp->if_softc); /* before arpwhohas */
701 arp_ifinit(ifp, ifa);
702 break;
703 #endif
704 #ifdef IPX
705 /*
706 * XXX This code is probably wrong
707 */
708 case AF_IPX:
709 {
710 struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
711
712 if (ipx_nullhost(*ina))
713 ina->x_host.c_host[5] = ARC_LLADDR(ifp);
714 else
715 arc_storelladdr(ifp, ina->x_host.c_host[5]);
716
717 /*
718 * Set new address
719 */
720 ifp->if_init(ifp->if_softc);
721 break;
722 }
723 #endif
724 default:
725 ifp->if_init(ifp->if_softc);
726 break;
727 }
728 break;
729
730 case SIOCGIFADDR:
731 {
732 struct sockaddr *sa;
733
734 sa = (struct sockaddr *) &ifr->ifr_data;
735 *(u_int8_t *)sa->sa_data = ARC_LLADDR(ifp);
736 }
737 break;
738
739 case SIOCADDMULTI:
740 case SIOCDELMULTI:
741 if (ifr == NULL)
742 error = EAFNOSUPPORT;
743 else {
744 switch (ifr->ifr_addr.sa_family) {
745 case AF_INET:
746 case AF_INET6:
747 error = 0;
748 break;
749 default:
750 error = EAFNOSUPPORT;
751 break;
752 }
753 }
754 break;
755
756 case SIOCSIFMTU:
757 /*
758 * Set the interface MTU.
759 * mtu can't be larger than ARCMTU for RFC1051
760 * and can't be larger than ARC_PHDS_MTU
761 */
762 if (((ifp->if_flags & IFF_LINK0) && ifr->ifr_mtu > ARCMTU) ||
763 ifr->ifr_mtu > ARC_PHDS_MAXMTU)
764 error = EINVAL;
765 else
766 ifp->if_mtu = ifr->ifr_mtu;
767 break;
768 }
769
770 return (error);
771 }
772
773 /* based on ether_resolvemulti() */
774 int
775 arc_resolvemulti(ifp, llsa, sa)
776 struct ifnet *ifp;
777 struct sockaddr **llsa;
778 struct sockaddr *sa;
779 {
780 struct sockaddr_dl *sdl;
781 struct sockaddr_in *sin;
782 #ifdef INET6
783 struct sockaddr_in6 *sin6;
784 #endif
785
786 switch(sa->sa_family) {
787 case AF_LINK:
788 /*
789 * No mapping needed. Just check that it's a valid MC address.
790 */
791 sdl = (struct sockaddr_dl *)sa;
792 if (*LLADDR(sdl) != arcbroadcastaddr)
793 return EADDRNOTAVAIL;
794 *llsa = 0;
795 return 0;
796 #ifdef INET
797 case AF_INET:
798 sin = (struct sockaddr_in *)sa;
799 if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
800 return EADDRNOTAVAIL;
801 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
802 M_NOWAIT | M_ZERO);
803 if (sdl == NULL)
804 return ENOMEM;
805 sdl->sdl_len = sizeof *sdl;
806 sdl->sdl_family = AF_LINK;
807 sdl->sdl_index = ifp->if_index;
808 sdl->sdl_type = IFT_ARCNET;
809 sdl->sdl_alen = ARC_ADDR_LEN;
810 *LLADDR(sdl) = 0;
811 *llsa = (struct sockaddr *)sdl;
812 return 0;
813 #endif
814 #ifdef INET6
815 case AF_INET6:
816 sin6 = (struct sockaddr_in6 *)sa;
817 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
818 /*
819 * An IP6 address of 0 means listen to all
820 * of the Ethernet multicast address used for IP6.
821 * (This is used for multicast routers.)
822 */
823 ifp->if_flags |= IFF_ALLMULTI;
824 *llsa = 0;
825 return 0;
826 }
827 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
828 return EADDRNOTAVAIL;
829 MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR,
830 M_NOWAIT | M_ZERO);
831 if (sdl == NULL)
832 return ENOMEM;
833 sdl->sdl_len = sizeof *sdl;
834 sdl->sdl_family = AF_LINK;
835 sdl->sdl_index = ifp->if_index;
836 sdl->sdl_type = IFT_ARCNET;
837 sdl->sdl_alen = ARC_ADDR_LEN;
838 *LLADDR(sdl) = 0;
839 *llsa = (struct sockaddr *)sdl;
840 return 0;
841 #endif
842
843 default:
844 /*
845 * Well, the text isn't quite right, but it's the name
846 * that counts...
847 */
848 return EAFNOSUPPORT;
849 }
850 }
851
852 MALLOC_DEFINE(M_ARCCOM, "arccom", "ARCNET interface internals");
853
854 static void*
855 arc_alloc(u_char type, struct ifnet *ifp)
856 {
857 struct arccom *ac;
858
859 ac = malloc(sizeof(struct arccom), M_ARCCOM, M_WAITOK | M_ZERO);
860 ac->ac_ifp = ifp;
861
862 return (ac);
863 }
864
865 static void
866 arc_free(void *com, u_char type)
867 {
868
869 free(com, M_ARCCOM);
870 }
871
872 static int
873 arc_modevent(module_t mod, int type, void *data)
874 {
875
876 switch (type) {
877 case MOD_LOAD:
878 if_register_com_alloc(IFT_ARCNET, arc_alloc, arc_free);
879 break;
880 case MOD_UNLOAD:
881 if_deregister_com_alloc(IFT_ARCNET);
882 break;
883 default:
884 return EOPNOTSUPP;
885 }
886
887 return (0);
888 }
889
890 static moduledata_t arc_mod = {
891 "arcnet",
892 arc_modevent,
893 0
894 };
895
896 DECLARE_MODULE(arcnet, arc_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
897 MODULE_VERSION(arcnet, 1);
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