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source: rtems/cpukit/libnetworking/net/if_ethersubr.c @ c3814c5

4.104.114.84.95

Last change on this file since c3814c5 was c3814c5, checked in by Ralf Corsepius <ralf.corsepius@…>, on 10/22/04 at 10:12:02

2004-10-22 Ralf Corsepius <ralf_corsepius@…>

libnetworking/net/if_ethersubr.c: Update from FreeBSD.

Property mode set to 100644

File size: 21.3 KB

Line
1	/*
2	* Copyright (c) 1982, 1989, 1993
3	* The Regents of the University of California. All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 4. Neither the name of the University nor the names of its contributors
14	* may be used to endorse or promote products derived from this software
15	* without specific prior written permission.
16	*
17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27	* SUCH DAMAGE.
28	*
29	* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
30	* $FreeBSD: src/sys/net/if_ethersubr.c,v 1.179 2004/10/12 10:33:41 glebius Exp $
31	*/
32
33	/*
34	* $Id$
35	*/
36
37	#include "opt_atalk.h"
38	#include "opt_inet.h"
39	#include "opt_inet6.h"
40	#include "opt_ipx.h"
41	#include "opt_bdg.h"
42	#include "opt_mac.h"
43	#include "opt_netgraph.h"
44
45	#include <sys/param.h>
46	#include <sys/systm.h>
47	#include <sys/kernel.h>
48	#include <sys/malloc.h>
49	#include <sys/mbuf.h>
50	#include <sys/protosw.h>
51	#include <sys/socket.h>
52	#include <sys/ioctl.h>
53	#include <sys/errno.h>
54	#include <sys/syslog.h>
55	#include <sys/sysctl.h>
56
57	#include <net/if.h>
58	#include <net/if_arp.h>
59	#include <net/netisr.h>
60	#include <net/route.h>
61	#include <net/if_llc.h>
62	#include <net/if_dl.h>
63	#include <net/if_types.h>
64	#include <net/ethernet.h>
65
66	#if defined(INET) \|\| defined(INET6)
67	#include <netinet/in.h>
68	#include <netinet/in_var.h>
69	#include <netinet/if_ether.h>
70	#include <netinet/ip_fw.h>
71	#ifndef __rtems__
72	#include <netinet/ip_dummynet.h>
73	#endif
74	#endif
75	#ifdef INET6
76	#include <netinet6/nd6.h>
77	#endif
78
79	#ifdef IPX
80	#include <netipx/ipx.h>
81	#include <netipx/ipx_if.h>
82	#endif
83
84	#ifdef NETATALK
85	#include <netatalk/at.h>
86	#include <netatalk/at_var.h>
87	#include <netatalk/at_extern.h>
88
89	#define llc_snap_org_code llc_un.type_snap.org_code
90	#define llc_snap_ether_type llc_un.type_snap.ether_type
91
92	extern u_char at_org_code[3];
93	extern u_char aarp_org_code[3];
94	#endif /* NETATALK */
95
96	u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
97	#define senderr(e) { error = (e); goto bad;}
98
99	/*
100	* Ethernet output routine.
101	* Encapsulate a packet of type family for the local net.
102	* Use trailer local net encapsulation if enough data in first
103	* packet leaves a multiple of 512 bytes of data in remainder.
104	* Assumes that ifp is actually pointer to arpcom structure.
105	*/
106	int
107	ether_output(struct ifnet ifp, struct mbuf m,
108	struct sockaddr dst, struct rtentry rt0)
109	{
110	short type;
111	int s, error = 0;
112	u_char edst[6];
113	register struct rtentry *rt;
114	struct mbuf mcopy = (struct mbuf )0;
115	register struct ether_header *eh;
116	int off, len = m->m_pkthdr.len;
117	struct arpcom ac = (struct arpcom )ifp;
118	#ifdef NETATALK
119	struct at_ifaddr *aa;
120	#endif /* NETATALK */
121	int hlen; /* link layer header length */
122
123	if ((ifp->if_flags & (IFF_UP\|IFF_RUNNING)) != (IFF_UP\|IFF_RUNNING))
124	senderr(ENETDOWN);
125	rt = rt0;
126	if (rt) {
127	if ((rt->rt_flags & RTF_UP) == 0) {
128	rt0 = rt = rtalloc1(dst, 1, 0UL);
129	if (rt0)
130	rt->rt_refcnt--;
131	else
132	senderr(EHOSTUNREACH);
133	}
134	if (rt->rt_flags & RTF_GATEWAY) {
135	if (rt->rt_gwroute == 0)
136	goto lookup;
137	if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
138	rtfree(rt); rt = rt0;
139	lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
140	0UL);
141	if ((rt = rt->rt_gwroute) == 0)
142	senderr(EHOSTUNREACH);
143	}
144	}
145	if (rt->rt_flags & RTF_REJECT)
146	if (rt->rt_rmx.rmx_expire == 0 \|\|
147	rtems_bsdnet_seconds_since_boot() < rt->rt_rmx.rmx_expire)
148	senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
149	}
150	hlen = ETHER_HDR_LEN;
151	switch (dst->sa_family) {
152
153	#ifdef INET
154	case AF_INET:
155	if (!arpresolve(ac, rt, m, dst, edst, rt0))
156	return (0); /* if not yet resolved */
157	/* If broadcasting on a simplex interface, loopback a copy */
158	if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
159	mcopy = m_copy(m, 0, (int)M_COPYALL);
160	off = m->m_pkthdr.len - m->m_len;
161	type = htons(ETHERTYPE_IP);
162	break;
163	#endif
164	#ifdef IPX
165	case AF_IPX:
166	{
167	struct ifaddr *ia;
168
169	type = htons(ETHERTYPE_IPX);
170	bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),
171	(caddr_t)edst, sizeof (edst));
172	for (ia = ifp->if_addrlist; ia != NULL; ia = ia->ifa_next)
173	if(ia->ifa_addr->sa_family == AF_IPX &&
174	!bcmp((caddr_t)edst,
175	(caddr_t)&((struct ipx_ifaddr *)ia)->ia_addr.sipx_addr.x_host,
176	sizeof(edst)))
177	return (looutput(ifp, m, dst, rt));
178	/* If broadcasting on a simplex interface, loopback a copy */
179	if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
180	mcopy = m_copy(m, 0, (int)M_COPYALL);
181	break;
182	}
183	#endif
184	#ifdef NETATALK
185	case AF_APPLETALK:
186	{
187	struct sockaddr_at sat = (struct sockaddr_at )dst;
188
189	/*
190	* super hack..
191	* Most of this loopback code should move into the appletalk
192	* code, but it's here for now.. remember to move it! [JRE]
193	* This may not get the same interface we started with
194	* fix asap. XXX
195	*/
196	aa = at_ifawithnet( sat );
197	if (aa == NULL) {
198	goto bad;
199	}
200	if( aa->aa_ifa.ifa_ifp != ifp ) {
201	(*aa->aa_ifa.ifa_ifp->if_output)(aa->aa_ifa.ifa_ifp,
202	m,dst,rt);
203	}
204	if (((sat->sat_addr.s_net == ATADDR_ANYNET)
205	&& (sat->sat_addr.s_node == ATADDR_ANYNODE))
206	\|\| ((sat->sat_addr.s_net == aa->aa_addr.sat_addr.s_net )
207	&& (sat->sat_addr.s_node == aa->aa_addr.sat_addr.s_node))) {
208	(void) looutput(ifp, m, dst, rt);
209	return(0);
210	}
211
212	if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) {
213	#ifdef NETATALKDEBUG
214	extern char prsockaddr(struct sockaddr );
215	printf("aarpresolv: failed for %s\n", prsockaddr(dst));
216	#endif /* NETATALKDEBUG */
217	return (0);
218	}
219
220	/*
221	* If broadcasting on a simplex interface, loopback a copy
222	*/
223	if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))
224	mcopy = m_copy(m, 0, (int)M_COPYALL);
225	}
226	/*
227	* In the phase 2 case, we need to prepend an mbuf for the llc header.
228	* Since we must preserve the value of m, which is passed to us by
229	* value, we m_copy() the first mbuf, and use it for our llc header.
230	*/
231	if ( aa->aa_flags & AFA_PHASE2 ) {
232	struct llc llc;
233
234	M_PREPEND(m, sizeof(struct llc), M_WAIT);
235	len += sizeof(struct llc);
236	llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;
237	llc.llc_control = LLC_UI;
238	bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));
239	llc.llc_snap_ether_type = htons( ETHERTYPE_AT );
240	bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));
241	type = htons(m->m_pkthdr.len);
242	} else {
243	type = htons(ETHERTYPE_AT);
244	}
245	break;
246	#endif /* NETATALK */
247
248	case AF_UNSPEC:
249	eh = (struct ether_header *)dst->sa_data;
250	(void)memcpy(edst, eh->ether_dhost, sizeof (edst));
251	type = eh->ether_type;
252	break;
253
254	default:
255	printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
256	dst->sa_family);
257	senderr(EAFNOSUPPORT);
258	}
259
260
261	if (mcopy)
262	(void) looutput(ifp, mcopy, dst, rt);
263	/*
264	* Add local net header. If no space in first mbuf,
265	* allocate another.
266	*/
267	M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);
268	if (m == NULL)
269	senderr(ENOBUFS);
270	eh = mtod(m, struct ether_header *);
271	(void)memcpy(&eh->ether_type, &type,
272	sizeof(eh->ether_type));
273	(void)memcpy(eh->ether_dhost, edst, sizeof (edst));
274	(void)memcpy(eh->ether_shost, ac->ac_enaddr,
275	sizeof(eh->ether_shost));
276	s = splimp();
277	/*
278	* Queue message on interface, and start output if interface
279	* not yet active.
280	*/
281	if (IF_QFULL(&ifp->if_snd)) {
282	IF_DROP(&ifp->if_snd);
283	splx(s);
284	senderr(ENOBUFS);
285	}
286	IF_ENQUEUE(&ifp->if_snd, m);
287	if ((ifp->if_flags & IFF_OACTIVE) == 0)
288	(*ifp->if_start)(ifp);
289	splx(s);
290	ifp->if_obytes += len + sizeof (struct ether_header);
291	if (m->m_flags & M_MCAST)
292	ifp->if_omcasts++;
293	return (error);
294
295	bad:
296	if (m)
297	m_freem(m);
298	return (error);
299	}
300
301	/*
302	* Process a received Ethernet packet;
303	* the packet is in the mbuf chain m without
304	* the ether header, which is provided separately.
305	*/
306	void
307	ether_input(ifp, eh, m)
308	struct ifnet *ifp;
309	register struct ether_header *eh;
310	struct mbuf *m;
311	{
312	register struct ifqueue *inq;
313	u_short ether_type;
314	int s;
315	#if defined(NETATALK)
316	struct llc *l;
317	#endif
318
319	if ((ifp->if_flags & IFF_UP) == 0) {
320	m_freem(m);
321	return;
322	}
323	ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
324	if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
325	sizeof(etherbroadcastaddr)) == 0)
326	m->m_flags \|= M_BCAST;
327	else if (eh->ether_dhost[0] & 1)
328	m->m_flags \|= M_MCAST;
329	if (m->m_flags & (M_BCAST\|M_MCAST))
330	ifp->if_imcasts++;
331
332	/*
333	* RTEMS addition -- allow application to `tap into'
334	* the incoming packet stream.
335	*/
336	if (ifp->if_tap && (*ifp->if_tap)(ifp, eh, m)) {
337	m_freem(m);
338	return;
339	}
340
341	ether_type = ntohs(eh->ether_type);
342
343	switch (ether_type) {
344	#ifdef INET
345	case ETHERTYPE_IP:
346	schednetisr(NETISR_IP);
347	inq = &ipintrq;
348	break;
349
350	case ETHERTYPE_ARP:
351	schednetisr(NETISR_ARP);
352	inq = &arpintrq;
353	break;
354	#endif
355	#ifdef IPX
356	case ETHERTYPE_IPX:
357	schednetisr(NETISR_IPX);
358	inq = &ipxintrq;
359	break;
360	#endif
361	#ifdef NETATALK
362	case ETHERTYPE_AT:
363	schednetisr(NETISR_ATALK);
364	inq = &atintrq1;
365	break;
366	case ETHERTYPE_AARP:
367	/* probably this should be done with a NETISR as well */
368	aarpinput((struct arpcom )ifp, m); / XXX */
369	return;
370	#endif /* NETATALK */
371	default:
372	#if defined (ISO) \|\| defined (LLC) \|\| defined(NETATALK)
373	if (ether_type > ETHERMTU)
374	goto dropanyway;
375	l = mtod(m, struct llc *);
376	switch (l->llc_dsap) {
377	#ifdef NETATALK
378	case LLC_SNAP_LSAP:
379	switch (l->llc_control) {
380	case LLC_UI:
381	if (l->llc_ssap != LLC_SNAP_LSAP)
382	goto dropanyway;
383
384	if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code,
385	sizeof(at_org_code)) == 0 &&
386	ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) {
387	inq = &atintrq2;
388	m_adj( m, sizeof( struct llc ));
389	schednetisr(NETISR_ATALK);
390	break;
391	}
392
393	if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code,
394	sizeof(aarp_org_code)) == 0 &&
395	ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) {
396	m_adj( m, sizeof( struct llc ));
397	aarpinput((struct arpcom )ifp, m); / XXX */
398	return;
399	}
400
401	default:
402	goto dropanyway;
403	}
404	break;
405	#endif /* NETATALK */
406	#ifdef ISO
407	case LLC_ISO_LSAP:
408	switch (l->llc_control) {
409	case LLC_UI:
410	/* LLC_UI_P forbidden in class 1 service */
411	if ((l->llc_dsap == LLC_ISO_LSAP) &&
412	(l->llc_ssap == LLC_ISO_LSAP)) {
413	/* LSAP for ISO */
414	if (m->m_pkthdr.len > ether_type)
415	m_adj(m, ether_type - m->m_pkthdr.len);
416	m->m_data += 3; /* XXX */
417	m->m_len -= 3; /* XXX */
418	m->m_pkthdr.len -= 3; /* XXX */
419	M_PREPEND(m, sizeof *eh, M_DONTWAIT);
420	if (m == 0)
421	return;
422	mtod(m, struct ether_header ) = *eh;
423	IFDEBUG(D_ETHER)
424	printf("clnp packet");
425	ENDDEBUG
426	schednetisr(NETISR_ISO);
427	inq = &clnlintrq;
428	break;
429	}
430	goto dropanyway;
431
432	case LLC_XID:
433	case LLC_XID_P:
434	if(m->m_len < 6)
435	goto dropanyway;
436	l->llc_window = 0;
437	l->llc_fid = 9;
438	l->llc_class = 1;
439	l->llc_dsap = l->llc_ssap = 0;
440	/* Fall through to */
441	case LLC_TEST:
442	case LLC_TEST_P:
443	{
444	struct sockaddr sa;
445	register struct ether_header *eh2;
446	int i;
447	u_char c = l->llc_dsap;
448
449	l->llc_dsap = l->llc_ssap;
450	l->llc_ssap = c;
451	if (m->m_flags & (M_BCAST \| M_MCAST))
452	bcopy((caddr_t)ac->ac_enaddr,
453	(caddr_t)eh->ether_dhost, 6);
454	sa.sa_family = AF_UNSPEC;
455	sa.sa_len = sizeof(sa);
456	eh2 = (struct ether_header *)sa.sa_data;
457	for (i = 0; i < 6; i++) {
458	eh2->ether_shost[i] = c = eh->ether_dhost[i];
459	eh2->ether_dhost[i] =
460	eh->ether_dhost[i] = eh->ether_shost[i];
461	eh->ether_shost[i] = c;
462	}
463	ifp->if_output(ifp, m, &sa, NULL);
464	return;
465	}
466	default:
467	m_freem(m);
468	return;
469	}
470	break;
471	#endif /* ISO */
472	#ifdef LLC
473	case LLC_X25_LSAP:
474	{
475	if (m->m_pkthdr.len > ether_type)
476	m_adj(m, ether_type - m->m_pkthdr.len);
477	M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT);
478	if (m == 0)
479	return;
480	if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP,
481	eh->ether_dhost, LLC_X25_LSAP, 6,
482	mtod(m, struct sdl_hdr *)))
483	panic("ETHER cons addr failure");
484	mtod(m, struct sdl_hdr *)->sdlhdr_len = ether_type;
485	#ifdef LLC_DEBUG
486	printf("llc packet\n");
487	#endif /* LLC_DEBUG */
488	schednetisr(NETISR_CCITT);
489	inq = &llcintrq;
490	break;
491	}
492	#endif /* LLC */
493	dropanyway:
494	default:
495	m_freem(m);
496	return;
497	}
498	#else /* ISO \|\| LLC \|\| NETATALK */
499	m_freem(m);
500	return;
501	#endif /* ISO \|\| LLC \|\| NETATALK */
502	}
503
504	s = splimp();
505	if (IF_QFULL(inq)) {
506	IF_DROP(inq);
507	m_freem(m);
508	} else
509	IF_ENQUEUE(inq, m);
510	splx(s);
511	}
512
513	/*
514	* Convert Ethernet address to printable (loggable) representation.
515	* This routine is for compatibility; it's better to just use
516	*
517	* printf("%6D", <pointer to address>, ":");
518	*
519	* since there's no static buffer involved.
520	*/
521	char *
522	ether_sprintf(const u_char *ap)
523	{
524	static char etherbuf[18];
525	snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
526	return (etherbuf);
527	}
528
529	/*
530	* Perform common duties while attaching to interface list
531	*/
532	void
533	ether_ifattach(struct ifnet *ifp)
534	{
535	struct ifaddr *ifa;
536	struct sockaddr_dl *sdl;
537
538	ifp->if_type = IFT_ETHER;
539	ifp->if_addrlen = ETHER_ADDR_LEN;
540	ifp->if_hdrlen = ETHER_HDR_LEN;
541	ifp->if_mtu = ETHERMTU;
542	if (ifp->if_baudrate == 0)
543	ifp->if_baudrate = 10000000;
544	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
545	if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
546	sdl->sdl_family == AF_LINK) {
547	sdl->sdl_type = IFT_ETHER;
548	sdl->sdl_alen = ifp->if_addrlen;
549	bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
550	LLADDR(sdl), ifp->if_addrlen);
551	break;
552	}
553	}
554
555	static u_char ether_ipmulticast_min[6] =
556	{ 0x01, 0x00, 0x5e, 0x00, 0x00, 0x00 };
557	static u_char ether_ipmulticast_max[6] =
558	{ 0x01, 0x00, 0x5e, 0x7f, 0xff, 0xff };
559	/*
560	* Add an Ethernet multicast address or range of addresses to the list for a
561	* given interface.
562	*/
563	int
564	ether_addmulti(ifr, ac)
565	struct ifreq *ifr;
566	register struct arpcom *ac;
567	{
568	register struct ether_multi *enm;
569	struct sockaddr_in *sin;
570	u_char addrlo[6];
571	u_char addrhi[6];
572	int set_allmulti = 0;
573	int s = splimp();
574
575	switch (ifr->ifr_addr.sa_family) {
576
577	case AF_UNSPEC:
578	bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
579	bcopy(addrlo, addrhi, 6);
580	break;
581
582	#ifdef INET
583	case AF_INET:
584	sin = (struct sockaddr_in *)&(ifr->ifr_addr);
585	if (sin->sin_addr.s_addr == INADDR_ANY) {
586	/*
587	* An IP address of INADDR_ANY means listen to all
588	* of the Ethernet multicast addresses used for IP.
589	* (This is for the sake of IP multicast routers.)
590	*/
591	bcopy(ether_ipmulticast_min, addrlo, 6);
592	bcopy(ether_ipmulticast_max, addrhi, 6);
593	set_allmulti = 1;
594	}
595	else {
596	ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
597	bcopy(addrlo, addrhi, 6);
598	}
599	break;
600	#endif
601
602	default:
603	splx(s);
604	return (EAFNOSUPPORT);
605	}
606
607	/*
608	* Verify that we have valid Ethernet multicast addresses.
609	*/
610	if ((addrlo[0] & 0x01) != 1 \|\| (addrhi[0] & 0x01) != 1) {
611	splx(s);
612	return (EINVAL);
613	}
614	/*
615	* See if the address range is already in the list.
616	*/
617	ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
618	if (enm != NULL) {
619	/*
620	* Found it; just increment the reference count.
621	*/
622	++enm->enm_refcount;
623	splx(s);
624	return (0);
625	}
626	/*
627	* New address or range; malloc a new multicast record
628	* and link it into the interface's multicast list.
629	*/
630	enm = (struct ether_multi )malloc(sizeof(enm), M_IFMADDR, M_NOWAIT);
631	if (enm == NULL) {
632	splx(s);
633	return (ENOBUFS);
634	}
635	bcopy(addrlo, enm->enm_addrlo, 6);
636	bcopy(addrhi, enm->enm_addrhi, 6);
637	enm->enm_ac = ac;
638	enm->enm_refcount = 1;
639	enm->enm_next = ac->ac_multiaddrs;
640	ac->ac_multiaddrs = enm;
641	ac->ac_multicnt++;
642	splx(s);
643	if (set_allmulti)
644	ac->ac_if.if_flags \|= IFF_ALLMULTI;
645
646	/*
647	* Return ENETRESET to inform the driver that the list has changed
648	* and its reception filter should be adjusted accordingly.
649	*/
650	return (ENETRESET);
651	}
652
653	/*
654	* Delete a multicast address record.
655	*/
656	int
657	ether_delmulti(ifr, ac)
658	struct ifreq *ifr;
659	register struct arpcom *ac;
660	{
661	register struct ether_multi *enm;
662	register struct ether_multi **p;
663	struct sockaddr_in *sin;
664	u_char addrlo[6];
665	u_char addrhi[6];
666	int unset_allmulti = 0;
667	int s = splimp();
668
669	switch (ifr->ifr_addr.sa_family) {
670
671	case AF_UNSPEC:
672	bcopy(ifr->ifr_addr.sa_data, addrlo, 6);
673	bcopy(addrlo, addrhi, 6);
674	break;
675
676	#ifdef INET
677	case AF_INET:
678	sin = (struct sockaddr_in *)&(ifr->ifr_addr);
679	if (sin->sin_addr.s_addr == INADDR_ANY) {
680	/*
681	* An IP address of INADDR_ANY means stop listening
682	* to the range of Ethernet multicast addresses used
683	* for IP.
684	*/
685	bcopy(ether_ipmulticast_min, addrlo, 6);
686	bcopy(ether_ipmulticast_max, addrhi, 6);
687	unset_allmulti = 1;
688	}
689	else {
690	ETHER_MAP_IP_MULTICAST(&sin->sin_addr, addrlo);
691	bcopy(addrlo, addrhi, 6);
692	}
693	break;
694	#endif
695
696	default:
697	splx(s);
698	return (EAFNOSUPPORT);
699	}
700
701	/*
702	* Look up the address in our list.
703	*/
704	ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm);
705	if (enm == NULL) {
706	splx(s);
707	return (ENXIO);
708	}
709	if (--enm->enm_refcount != 0) {
710	/*
711	* Still some claims to this record.
712	*/
713	splx(s);
714	return (0);
715	}
716	/*
717	* No remaining claims to this record; unlink and free it.
718	*/
719	for (p = &enm->enm_ac->ac_multiaddrs;
720	*p != enm;
721	p = &(*p)->enm_next)
722	continue;
723	p = (p)->enm_next;
724	free(enm, M_IFMADDR);
725	ac->ac_multicnt--;
726	splx(s);
727	if (unset_allmulti)
728	ac->ac_if.if_flags &= ~IFF_ALLMULTI;
729
730	/*
731	* Return ENETRESET to inform the driver that the list has changed
732	* and its reception filter should be adjusted accordingly.
733	*/
734	return (ENETRESET);
735	}
736
737	SYSCTL_DECL(_net_link);
738	SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
739
740	#if 0
741	/*
742	* This is for reference. We have a table-driven version
743	* of the little-endian crc32 generator, which is faster
744	* than the double-loop.
745	*/
746	uint32_t
747	ether_crc32_le(const uint8_t *buf, size_t len)
748	{
749	size_t i;
750	uint32_t crc;
751	int bit;
752	uint8_t data;
753
754	crc = 0xffffffff; /* initial value */
755
756	for (i = 0; i < len; i++) {
757	for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1)
758	carry = (crc ^ data) & 1;
759	crc >>= 1;
760	if (carry)
761	crc = (crc ^ ETHER_CRC_POLY_LE);
762	}
763
764	return (crc);
765	}
766	#else
767	uint32_t
768	ether_crc32_le(const uint8_t *buf, size_t len)
769	{
770	static const uint32_t crctab[] = {
771	0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
772	0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
773	0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
774	0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
775	};
776	size_t i;
777	uint32_t crc;
778
779	crc = 0xffffffff; /* initial value */
780
781	for (i = 0; i < len; i++) {
782	crc ^= buf[i];
783	crc = (crc >> 4) ^ crctab[crc & 0xf];
784	crc = (crc >> 4) ^ crctab[crc & 0xf];
785	}
786
787	return (crc);
788	}
789	#endif
790
791	uint32_t
792	ether_crc32_be(const uint8_t *buf, size_t len)
793	{
794	size_t i;
795	uint32_t crc, carry;
796	int bit;
797	uint8_t data;
798
799	crc = 0xffffffff; /* initial value */
800
801	for (i = 0; i < len; i++) {
802	for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
803	carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
804	crc <<= 1;
805	if (carry)
806	crc = (crc ^ ETHER_CRC_POLY_BE) \| carry;
807	}
808	}
809
810	return (crc);
811	}
812
813	int
814	ether_ioctl(struct ifnet *ifp, int command, caddr_t data)
815	{
816	struct ifaddr ifa = (struct ifaddr ) data;
817	struct ifreq ifr = (struct ifreq ) data;
818	int error = 0;
819
820	switch (command) {
821	case SIOCSIFADDR:
822	ifp->if_flags \|= IFF_UP;
823
824	switch (ifa->ifa_addr->sa_family) {
825	#ifdef INET
826	case AF_INET:
827	ifp->if_init(ifp->if_softc); /* before arpwhohas */
828	arp_ifinit((struct arpcom *)ifp, ifa);
829	break;
830	#endif
831	#ifdef IPX
832	/*
833	* XXX - This code is probably wrong
834	*/
835	case AF_IPX:
836	{
837	register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
838	struct arpcom ac = (struct arpcom ) (ifp->if_softc);
839
840	if (ipx_nullhost(*ina))
841	ina->x_host =
842	(union ipx_host )
843	ac->ac_enaddr;
844	else {
845	bcopy((caddr_t) ina->x_host.c_host,
846	(caddr_t) ac->ac_enaddr,
847	sizeof(ac->ac_enaddr));
848	}
849
850	/*
851	* Set new address
852	*/
853	ifp->if_init(ifp->if_softc);
854	break;
855	}
856	#endif
857	default:
858	ifp->if_init(ifp->if_softc);
859	break;
860	}
861	break;
862
863	case SIOCGIFADDR:
864	{
865	struct sockaddr *sa;
866
867	sa = (struct sockaddr *) & ifr->ifr_data;
868	bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
869	(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
870	}
871	break;
872
873	case SIOCSIFMTU:
874	/*
875	* Set the interface MTU.
876	*/
877	if (ifr->ifr_mtu > ETHERMTU) {
878	error = EINVAL;
879	} else {
880	ifp->if_mtu = ifr->ifr_mtu;
881	}
882	break;
883	}
884	return (error);
885	}

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